CA1137044A - Apparatus and process for attaching elastic strips during the manufacture of elastic leg disposable diapers - Google Patents
Apparatus and process for attaching elastic strips during the manufacture of elastic leg disposable diapersInfo
- Publication number
- CA1137044A CA1137044A CA000348633A CA348633A CA1137044A CA 1137044 A CA1137044 A CA 1137044A CA 000348633 A CA000348633 A CA 000348633A CA 348633 A CA348633 A CA 348633A CA 1137044 A CA1137044 A CA 1137044A
- Authority
- CA
- Canada
- Prior art keywords
- elastic strips
- elastic
- lengths
- diapers
- strips
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15585—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers
- A61F13/15593—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers having elastic ribbons fixed thereto; Devices for applying the ribbons
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
- Y10T156/1317—Means feeding plural workpieces to be joined
- Y10T156/1343—Cutting indefinite length web after assembly with discrete article
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
- Y10T156/1702—For plural parts or plural areas of single part
- Y10T156/1712—Indefinite or running length work
- Y10T156/1722—Means applying fluent adhesive or adhesive activator material between layers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
- Y10T156/1702—For plural parts or plural areas of single part
- Y10T156/1712—Indefinite or running length work
- Y10T156/1741—Progressive continuous bonding press [e.g., roll couples]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
- Y10T156/1798—Surface bonding means and/or assemblymeans with work feeding or handling means with liquid adhesive or adhesive activator applying means
Abstract
APPARATUS AND PROCESS FOR
ATTACHING ELASTIC STRIPS DURING THE
MANUFACTURE OF ELASTIC LEG DISPOSABLE DIAPERS
Abstract of the Disclosure An apparatus and process for attach-ing elastic strips in elastic leg disposable diapers having gathered and extendible side portions in the crotch area during manufacture of such diapers in an assembly machine including mechanisms for alternately stretching and relaxing predetermined lengths of the elastic strips for adhesive attachment of the stretched lengths to the crotch area and the more relaxed lengths to the outer waist areas continuously along the edges of the diaper. These mechanisms include devices for feeding elastic strips at a predetermined constant rate for adhesive attachment in the diaper, nipping mechanisms engaging the elastic strips and defining a pre-determined distance of travel of the elastic strips therebetween, movable devices for en-gaging the elastic strips and for alternately moving to other positions to vary the distance of travel of the elastic strips for alternately stretching and relaxing the elastic strips and compensating mechanisms for maintaining the stretching and the relaxing, respectively, during feeding of the stretched and relaxed lengths.
ATTACHING ELASTIC STRIPS DURING THE
MANUFACTURE OF ELASTIC LEG DISPOSABLE DIAPERS
Abstract of the Disclosure An apparatus and process for attach-ing elastic strips in elastic leg disposable diapers having gathered and extendible side portions in the crotch area during manufacture of such diapers in an assembly machine including mechanisms for alternately stretching and relaxing predetermined lengths of the elastic strips for adhesive attachment of the stretched lengths to the crotch area and the more relaxed lengths to the outer waist areas continuously along the edges of the diaper. These mechanisms include devices for feeding elastic strips at a predetermined constant rate for adhesive attachment in the diaper, nipping mechanisms engaging the elastic strips and defining a pre-determined distance of travel of the elastic strips therebetween, movable devices for en-gaging the elastic strips and for alternately moving to other positions to vary the distance of travel of the elastic strips for alternately stretching and relaxing the elastic strips and compensating mechanisms for maintaining the stretching and the relaxing, respectively, during feeding of the stretched and relaxed lengths.
Description
:
This invention rel.ates to an apparatus and more specific process for attaching elastic strips in elastic leg disposable diapers in accordance::
with the improved elastic leg disposable diaper and process for manuacturing same disclosed in co-pending Canadian patent application Serial No. 348,631 filed March 28, 1980, and assigned to the assignee of the present invention, wherein elastic strips are adhes.ively sectlred continuously along the longi~
tudinal edges of the disposable diaper and are alternately secured.in stretched condition along the crotch area and in a more relaxed condi~ion along the outer wais~ areas to form gathered and extendible side portions in the crotch area for elastic conformance of such side portions with the legs of the ~earer.
The novel elastic leg diaper product and broad process of insert~
ing elastic strips therein which are alternately stretched and relaxed and continuously secured along the longi~udinal edges of the diapers to overcome problems resulting from prior art processes and to produce an improved diaper product are fully set forth in assigneels above-identified co-pending application and reference may be had thereto for a full discussion of same.
Additionally, an example of a suitable apparatus is disclosed in co-pending Canadian application Serial No. 348,632, filed March 28, 1980, and assigned to the assignee of the present applica~ion, for inserting elastic strips during the manufacture of elastic leg disposable diapers in accordance with the improved elastic leg disposable diaper and process for manufacturing same disclosed in the above-mentioned co-pending Patent application Serial ~o. 348,631.
It is the object of this invention to provide a further apparatus -1- .................................. :
.~
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:
~37~ 4 (in addition to that disclosed in assignee's co-pendlng application Serial No. 348,632)and a more specific process for attaching elastlc strips in elastic leg dlsposable diapers having gathered and extendible side portions in the crotch area during the manufacture of such diapers in an assembly machine in accordance with the broad process and resulting elastlc leg disposable diaper product of assignee's co-pending application Serial No.
348,631.
Summary of the Inventlon By thls inven~ion~ it has been found that the above objec~ may be accomplished by provlding an appara~us and process, generally as follows.
Means are provided for alternately stretching and relaxing pre-determined lengths of the elastic strips for adhesive attachment of the stretched lengths to the crotch area and the more relaxed lengths to the outer waist areas continuously along the longltudinal edges of the diaper, ~ ~ .
wherein the means for alternately stretching and relaxing predetermined lengths of the elastic strips include the following: :
Means feed continoous elastic strlps at a predetermined constant rate from-a supply into desired position in the diapers for adhesive attach-ment therein. Two spaced-apart nipping means coopera~e
This invention rel.ates to an apparatus and more specific process for attaching elastic strips in elastic leg disposable diapers in accordance::
with the improved elastic leg disposable diaper and process for manuacturing same disclosed in co-pending Canadian patent application Serial No. 348,631 filed March 28, 1980, and assigned to the assignee of the present invention, wherein elastic strips are adhes.ively sectlred continuously along the longi~
tudinal edges of the disposable diaper and are alternately secured.in stretched condition along the crotch area and in a more relaxed condi~ion along the outer wais~ areas to form gathered and extendible side portions in the crotch area for elastic conformance of such side portions with the legs of the ~earer.
The novel elastic leg diaper product and broad process of insert~
ing elastic strips therein which are alternately stretched and relaxed and continuously secured along the longi~udinal edges of the diapers to overcome problems resulting from prior art processes and to produce an improved diaper product are fully set forth in assigneels above-identified co-pending application and reference may be had thereto for a full discussion of same.
Additionally, an example of a suitable apparatus is disclosed in co-pending Canadian application Serial No. 348,632, filed March 28, 1980, and assigned to the assignee of the present applica~ion, for inserting elastic strips during the manufacture of elastic leg disposable diapers in accordance with the improved elastic leg disposable diaper and process for manufacturing same disclosed in the above-mentioned co-pending Patent application Serial ~o. 348,631.
It is the object of this invention to provide a further apparatus -1- .................................. :
.~
.
:
~37~ 4 (in addition to that disclosed in assignee's co-pendlng application Serial No. 348,632)and a more specific process for attaching elastlc strips in elastic leg dlsposable diapers having gathered and extendible side portions in the crotch area during the manufacture of such diapers in an assembly machine in accordance with the broad process and resulting elastlc leg disposable diaper product of assignee's co-pending application Serial No.
348,631.
Summary of the Inventlon By thls inven~ion~ it has been found that the above objec~ may be accomplished by provlding an appara~us and process, generally as follows.
Means are provided for alternately stretching and relaxing pre-determined lengths of the elastic strips for adhesive attachment of the stretched lengths to the crotch area and the more relaxed lengths to the outer waist areas continuously along the longltudinal edges of the diaper, ~ ~ .
wherein the means for alternately stretching and relaxing predetermined lengths of the elastic strips include the following: :
Means feed continoous elastic strlps at a predetermined constant rate from-a supply into desired position in the diapers for adhesive attach-ment therein. Two spaced-apart nipping means coopera~e
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, :
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with the Eeeding means and engage the elastic strips during feeding thereof and define a predetermined distance of travel of the elastic strips between the nipping means. One of the nipping means is positioned at the point of adhesive attachment of the elastic strips in the diapers. Movable means are positioned for engaging the elastic strips as they are fed between the nippi.ng means and for alternately rnovin~ to other positions to vary the distance of travel of the elastic 10 strips for alternately stretching and relaxing lengths ':~
of the elastic strips.
Inasmuch as the feeding of elastic strips necessarily places some tension and causes some stretching :
and cannot be accompIished in a to.tally tensionless 15 or relaxed condition and since t.he elastic strips ..
are being fed at a constant rate from the supply which must be less than the length of the aiapers since portions thereof are being attached in stretched . condi.tion and since the elast.ic strips are i.n e~fect underfed for.the relaxed leng-.ti~s and overfed for the stretched lengths, some means must be provided for compensating for these conditions. Accordingl.y, means are connected with the elastic strip engaging means for moving same and for quickly increasing :~
the distance or travel o~ the elastic strips for stre~.chin~ lengths of the elastic strips and incrementally further increasing the distance of the travel of the elastic strips for a predetermined period of time to compensate and maintain the stretching of the lengths of the elastic strips while they are being fed into position in the diapers, and then quickly decreasing the distance of travel of the elastic strips for relaxing lengths of the elastic s~rips and incrementally further decreasing the distance
, :
` ~37~
with the Eeeding means and engage the elastic strips during feeding thereof and define a predetermined distance of travel of the elastic strips between the nipping means. One of the nipping means is positioned at the point of adhesive attachment of the elastic strips in the diapers. Movable means are positioned for engaging the elastic strips as they are fed between the nippi.ng means and for alternately rnovin~ to other positions to vary the distance of travel of the elastic 10 strips for alternately stretching and relaxing lengths ':~
of the elastic strips.
Inasmuch as the feeding of elastic strips necessarily places some tension and causes some stretching :
and cannot be accompIished in a to.tally tensionless 15 or relaxed condition and since t.he elastic strips ..
are being fed at a constant rate from the supply which must be less than the length of the aiapers since portions thereof are being attached in stretched . condi.tion and since the elast.ic strips are i.n e~fect underfed for.the relaxed leng-.ti~s and overfed for the stretched lengths, some means must be provided for compensating for these conditions. Accordingl.y, means are connected with the elastic strip engaging means for moving same and for quickly increasing :~
the distance or travel o~ the elastic strips for stre~.chin~ lengths of the elastic strips and incrementally further increasing the distance of the travel of the elastic strips for a predetermined period of time to compensate and maintain the stretching of the lengths of the elastic strips while they are being fed into position in the diapers, and then quickly decreasing the distance of travel of the elastic strips for relaxing lengths of the elastic s~rips and incrementally further decreasing the distance
3~ of travel of the elastic strips for a predetermined period b time to compensate and maintain the relaxing .~ of the lengths of elastic strips while they are being fed into position in the diapers.
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Preferably, a timed control means is connected with the means for moving said elastic strip engaging means for operating such means in timed correlation with the speed of movement of the diapers through the assembly machine and the lengths of the longitudinal edges of the crotch area and the waist areas to which alternate lengths of stretched and relaxed portions of the elastic tapes are to be attached.
Brief Descrlption of the Draw n~
. .
Some of the objects and advantages of this invention having been set forth, other objects and advantages will appear when taken in conjunction with the accompanying drawings, in which: ~
Figure 1 is a schematic, perspective view cf apparatus for manufacturing e:Lastic leg diapers utilizing the improved apparatus of this invention;
Figure 2 is an elevational view, partly in section, of the apparatus of this invention and taken generally in the direction of arrow 2 in Figure l; :;
Figure 3 is a schematic, perspec-tive view of the apparatus of this invention with some devices omitted and with the bottom cover sheet of the diaper :
omitted for clarity of illustration; ~ -Figure 4 is a schematic, perspective view of the apparatus of this invention taken from the opposite side of the view of Figure 3 and generally in the direction of the arrow 4 in Figure 3 with some devices omitted and with the bottom cover sheet ~f the diaper omitted for clarity of illustration;
Figure 5 is a schematic of the timed control means of the apparatus of this invention;
Figure 6 is an enlarged, side elevational, schematic view of a portion of the apparatus of Figure 1 and taken generally in the direction of the arrow 6 of Figure l;
Figure 7 is a partial, elevational view, taken generally along the line 7-7 o~ Figure 6;
~ .. ,, .. ,. ,~ .. .. . . . .
, : :
~3~ 4 ~ igure 8 is a diagram illustrating the motion of the devices o~ the apparatus of this invention;
Figures 9-12 are side, elevational, schematic ,, views illustrating a portion of the apparatus shown in Figure 6 witll the devices in various positions during operation o~ the apparatus of this invention;
Figure 13 is a top pexspective view of an elastic leg disposable di,aper produced by the ~' :
apparatus and process of this inventlon and shown in generally relaxed condition;
Figure 1~ is a top perspective view of .
interconnected d.iapers produced by,the apparatu~
of Figure l; and .
Figure 15 is a sectional view through the diaper o Figure 13 and taken generally along the line 15-15 of Figure 13.
De-tai.led Descrlption of the Invention ' In.the drawings, Figures 1~12 illustrate the ':
appara~.us and proaess of thi:s invention for attaching elastic stxips during the manuacture of elastic leg disposable di~apers and,Figures 13-15 illustrate ~ ' the resulting elastic ~leg disposable diaper product. `:.
: : Referring fLrstly to the elas,-tic leg disposable :
diaper product produced by the apparatus of this `
inven~ion for purposes of background, the improved elastic leg disposable diaper, as discussed more fully in th3~o~e3lidentified co-pending application , ~ Serial No. ~6t~R~ o the assignee of this invention, is referred to generally by the reference numeral lO. The diaper lO is preferably of generally hour-glass configuration and has a c~ntral crotch area ,, C and outer waist areas W designed to be placed around and fit the crotch and waist of the wearer when the diaper lO is placed on the wearer in conventional ~:
35 manner. The diaper 10 urther includes a 1uid- .
permeable top cover sheet ll, a 1uid impermeable bottom cover sheet 12 and a fluid`absorbent interior .. .... . .
., ~ .
-- . .
-: .
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..
1~37~
pad 13, all OJ' which may be of conv~ntional construction.
Tl~e~ disposable diaper 10 .is secured along its longitudinal and transverse edges by suitable adhes.ive or other attachment means 14 which secures the top cover sheet 11 and the bottom cover sheet 12 and generally provides an envelope around the interior pad 13 which is unsecured at its longitudinal edges and in the central crotch area C to either the top cover sheet or hottom cover sheet to allow the interior pad 13 to conform to the shape of the wearer when placed in position on the wearer.
The diaper 10 further includes elastic strips 16 extending and being secured by adhesive or other sui~able means 17 to the diaper 10 continuously 15 along the full length of the outside longitudinal ;
edges of the diaper 10. The elastic strips 16 are secured in the crotch ar.ea C in stretched elastically-contractible condition forming gathered and extendible side portions P in the crot~h area fol^ elastic conformance with the legs o the wearer and are secured in the -~aist areas W in less elastically-contractible or relaxed condition so as to provide less or no gathering of the side portions of th~ wais~ areas W.
Refe~ring now to the apparatus o the present invention, Figure 1 illustrates schematically an apparat~s for manufacturing elastic leg disposable diapers 10 utilizing the apparatus of this invention for attaching elastic strips 16 during the manufacture of such elastic le~ disposable diapers 10. The apparatus of this invention is shown schematically therein and many of the drives of the overall diaper manufactur-ing apparatus are eliminated for purposes of clari.ty ~;
o the disclosure and such drives or other devices may be easily desi.gned by those with ordinary skill in the art. However, details of construction and ~.
.
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operation of apparatus for manufacturlng disposable diapers may be seen inco pending Canadian application Serial No. 347,782 9 filed March 17, 1980, and prior U.S. Patents Re. 28,139 and 31984~272~ all of wnlch are assigned to the assignee of the present invention and which are applicable for use with the apparatus for attaching elastic strips of ~he present invention.
In Flgure 1, connected multi-layer interior absorbent pads 13 are shown being fed through spaced-apart pairs of driven feed rolls 65, 66 between which is provided a pad severing means in the form of a rotating cuttlng roll 67 having a knife blade 68 thereon and an anvil roll 69 which operate to intermittently cut the interconnected multi-layer interior pads 13 transversely for separation of the interconnected pads 13. The driven feed rolls 66 are driven somewhat faster than the driven feed rolls 65 to effect an overfeeding of the severed interior pads 13 for spacing of the interior pads 13 apart in the further fabrication of the disposable diapers 10 .
Immediately prior to the feed rolls 66, the top cover sheet 11 is fed from a suitable source of supply to feed rolls 66 through a glue applicator 71 which applies the glue or adhesive 14 of a suitable type in a predetermined pattern across the top cover sheet 11 at spaced locations and along the longitudinal edges for purposes of gluing the transverse and longi-tudinal edges of the ultimately fabricated disposable diaper 10 together.
Glue applicator 71 may comprise any suitable glue applicator for the above purpose and as illustrated herein may include a glue applic~tor roll 72 having indentations or cups 72' therein which collectively are of the pre-determined configuration of the areas for receiving adhesive 14. The appli-cator roll 72 may pass through an adhesive supply tank 73 for containing a supply of the adhesive 14.
, - : ~ : , :
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~8-Simultaneously with the above, the ~ottom cover sheet 12 is ~ed from a source of supply to feed rolls 66 and into superimposed position under the spaced-apart interior pads 13 and top cover sheet 11 so that all of these components are in superimposed position. The top cover sheet 11 and bottom cover sheet 12 are pressed into contact wi.th each other by the feed rolls 66 and subsequent rolls and are adhesively secured together along longitudi.nal edges `.
and trans~ersely between the separated and spaced-apart interior pads 13 to form serially-interconnected disposable diapers 10 r as shown generally in Figures 1 and 14l which are continuously fed through the remaining portions of the apparatus of Figure 1 by lS suitable feeding means.
These seriall~-interconnected diapers 10 are fed through a series of mechanlsms,no-t shown, and are ultimately fed between cutter roll 75 and anvil roll 76 which cut the serially-lnterconnected diapers 10 transversely between interior pads 13 to form individual diapers 10.
Cooperating with the above-described apparatus for manufacturing disposable diapers 10, apparatus in accordance with this invention is provided for 25 attaching elastic strips 16 during the manufacture .~
of such disposable diapers 10~ Thls apparatus includes .-means for alternately stretching and relaxing predetermined lengths of elastic strips for adhesive attachment of the stretched elastic lengths S to the crotch :.
area C and the more relaxed lengths R to the outer -waist areas W continuously along the longitudinal edges of the diaper, as may be seen particularly .: :
in Figures 14 and 15.
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g This apparatus comprises, firstly, means for feediny continuous elastic strips 16 from any ..
suitable source of supply (not shown ) at a predetermined constant rat~ into desired posltion ~or adhesive 5 attachment in the diapers~ As illustrated particularly ~.
in Figures 3 and 4, the feeding means may include driven feed rolls 20 commonly mounted on a driven shaft 21 for receiving the elastic strips 16 from a suitable source o~ supply ~not shown). From the feed rolls 20, the elastic strips are ~ed into engagement with ~he bottom cover sheet 12 for immediate adhesive attachment thereto and are then fed by the feed rolls 66 into position with the ~emaining:components of the disposable diapers 10, as shown in Figure l.
The drive shaft 21 is driven ~y a suitable chain drive 22 from a shaft 23 which may, in turn, be driven by suitable drive mechanisms from the diaper fabricating machi.ne (not snown) at a preaetermined constant rate.
The means for alternately stretching and relaxing predetermined lengths of the elastic strips 16 further includes two spaced-apar-t nipping means cooperating with the feeding means and enga~ing the elastic strips 16 during the feeding thereof and defining a predetermined distance of travel of the elastic strips 16 between the nipping means. In the embodiment o~ the apparatus illustrated herein, the two spaced-apart nipping means comprise the feeding rolls 20 and cooperating gui.de rolls 24 which are suitably mounted for pivotal biased engagement with - 30 the feed rolls 20, as shown in Figure 6, and the elastic strips 16 pass in generally an S-shaped path around the feed rolls 20 and the guide rolls 24 and .
are nipped therebetween to form the first nipping means. The second nipping means consists of a pair 3~ of opposed rolIs 26, 27 which are mounted for nipping engagement with each other in any suitable manner ,d and are spaFed from the first nippin means 20, 24 ., - .
. ~
3~4~
~10--to form a predetermined distance of travel of the elastic strips therebetween, a~ may he seen in Figure 6.
This second nipping means 26, 27 also receives the bottom cover sheet 12 so that the elastic strips 16 are adhesive-5 ly attached to this diaper component at this point. .:
From the nipping means formed by the rolls20, 24, the elastic strips 16 pass over and into contact Wit}l a driven adhesive applica~or roll 28 which includes cups or indentations 28' therein for picking 10 up adhesive 17 as it passes through a supply tank 29 -:
containing such adhesive 17. The applicator roll 28 is adapted to apply adhesive continuously along one of the faces of each of the elastic strips 16 as they are fed past the driven applicator roll 28. The ~
15 driven applicator roll 28 may:also be in nipping ~:
engagement with the guide rolls 24 and constitute the first nipping means; The adhesive 17 is desirably of a fast-acting type since ~he elastic strips are being secured in both the stretched and relaxe~ condition and .
20 the adhesive must set up as soon as the elastic strips .;
are moved into contact wi:th one of the components of the disposable dia~er 10, such as the bottom cover sheet 12 in the case of the apparatus illustrated herein.
: : The means for alternately stretching and relaxing predetermined lengths of the elastic strips 16 further comprises movable means, such as rolls : . .
30, positioned for engaging the elastic strips 16 as they are fed between the nipping means 20, 24 or 24, 48 and 26, 27 and foralternately moving to ::`
: 30 other positions (as shown in Figures 9-12) to vary the distance of travel of the elastic strips 16 between -such nipping means for:alternately stretching and relaxing leng-ths of the elastic strips 16.
Means àre connected with the elastic str.ip engaging roll means.30 for moving same and comprise a .p.iston and cylinder 32, 33 connected tD the roll means:30.and mounted for alternate . , - :
1~L37~
quick movement to and from a contracted position ~ :
(dotted line position of Figure lO and solid line position Qf Figure ll) and an extended posi.tion (solid ~:
line positions of Figures 9, lO and 12~ for alternately moving the elastic strip engaging roll means 30 quickly to a posit.ion for increasing the distance of travel of the elastic strips 16 between the nipping means for st.retching the lengths S of elastic strips 16 alld then quickly to a position decreasing the distance of travel o~ the elastic strips 16 for relaxing leng*hs R of the elastic strips 16, ::
There is further provided a cran~ means includin~ a rotatlng crank disc 35 and a crank arm which is form~d by the piston and cylinder 32, 33 and has one end eccentrically pivo-tally mounted on the rotating crank disc and the other end carrying the elastic s~ip engaging roll means 30 for translating- the rotary motion of the crank disc 35 to incremental reclprocation of ., the elastic strip engaging roll means 30 for a:lternately moving the elastlc strip~engaging roll means 30 to pos:itions incrementally further incxeasin~ the distanc(-~
of travel of the elas;tic strips 16 after the increase ~;
thereof by the piston and cylinder 32, 33 to maintain 25 the stretching of;the lengths S of elastic strips .~.
16 during the:feeding thereof (as is illustrated -during rotation of the crank disc from the position of Figure lO to the position of Figure ll) and then`
to positions incrementally further decreasing the 30 distance of travel of:the elastic strips~l6 after :
the decrease thereof by the piston and cylinder means 32, 33 to maintain the relaxing of the lengths R
of elastic strips 16 during the -feeding thereof (as illus-trated durlng the rotation of the crank disc 35 from the position shown in Figure 11 to the position shown in Figure lO).
. ' ~7~~4 :~
The means for alternately stretching and relaxing predeterrnined lengths of the elastic strips 16 further comprises timed control means (a schematic of which is illustrated in Figure 5) connected with .and controlling operation of the piston and cylinder 32, 33 and the crank means 35, 32 and 33, which form the means for moviny-the elastlc stri.p engaging roll means 30, in correlation wi:th the'spebd of movement o~ the diapers 10 through the assembly machine and the lengths of the longitud.~nal edges of t.he crotch area C and the waist areas W '~
to which alternate stretched and relaxed lengths S, R of the elastic strips 16 are to he attached. .~:
As shown in Figure 5, this timed control means may comprise a source of pressurized air 40 which pro~Jides pressurized air to a pair of conduits ~1, 4~ throug}l pressure reguIating valves 43, ~4 and to electrically operated valves 45, 46. From the valves 45, 46 the air aonduits 41, 42 extend 20 to opposite sides of the cylinder 33 for respective ~'~
actuation of the piston and cylinder 32, 33 for quick ':
movement to the extended positiGn and the contracted ,!
position. The valves 45 and 46 are controlled for .
alternate actuation by electrical switches 47, 48 which are controlled by cams 49, S0 mounted on a common shaft 51 driven by a chain or ~elt drive 52 from a driven shaft 53 which carries and drives the crank disc 35. The shaft 53 is connected by chain or belt drive 54 to driven shaft 23 which is driven 3G from drive mechanisms of the diaper assembly machine' in timed correlation with the drives for feeding the diapers 10 through the assembly machine during ~;
their fabrication.
For stabilizing movement of the strip engaging 35 rolls 30, they are mounted on a comrnon shaft 56,attached . :
to the piston 32 and which carries pinions 57 positioned .
'' for up and down movemen~ in racks 58. . .: '.-..................... ,;
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For operation of the above-described apparatus for attaching elastic stri.ps 16 in elastic leg disposable diapers 10 during the manufacture of such diapers 10 in the assembly machine, the following operation S and process may be uti~ized.
A typical di.sposable diaper 10 is approximately 17.8 inches in length and the central crotch area C would be approximately 8.9 inches in length and the outer waist areas 4.45 inches in length for a con~ined length of ~.9 inches. Therefore, in ordex to attach relaxed lengths R and stretched lengths S of the continuous elastic strips 16 alternately ~?, to the waist areas W and the crotch areas C of the interconnected diapers 10, as shown in Figure 14, a relaxed length R of elastic strips 16 of approximately 8.9 inches must be fed by the apparatus of this inventi.on into adhesive en~agement in proper position along the longitudiIlal edges of the interconnected diapers 10 and then a stretched length 5 of the elastic strips 16 of approximately ~.9 inches must he fed into position in the diaper 10 which requires stretching of the stretched length S to approximately twiee its original length which wlll result in the feeding of approximately
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Preferably, a timed control means is connected with the means for moving said elastic strip engaging means for operating such means in timed correlation with the speed of movement of the diapers through the assembly machine and the lengths of the longitudinal edges of the crotch area and the waist areas to which alternate lengths of stretched and relaxed portions of the elastic tapes are to be attached.
Brief Descrlption of the Draw n~
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Some of the objects and advantages of this invention having been set forth, other objects and advantages will appear when taken in conjunction with the accompanying drawings, in which: ~
Figure 1 is a schematic, perspective view cf apparatus for manufacturing e:Lastic leg diapers utilizing the improved apparatus of this invention;
Figure 2 is an elevational view, partly in section, of the apparatus of this invention and taken generally in the direction of arrow 2 in Figure l; :;
Figure 3 is a schematic, perspec-tive view of the apparatus of this invention with some devices omitted and with the bottom cover sheet of the diaper :
omitted for clarity of illustration; ~ -Figure 4 is a schematic, perspective view of the apparatus of this invention taken from the opposite side of the view of Figure 3 and generally in the direction of the arrow 4 in Figure 3 with some devices omitted and with the bottom cover sheet ~f the diaper omitted for clarity of illustration;
Figure 5 is a schematic of the timed control means of the apparatus of this invention;
Figure 6 is an enlarged, side elevational, schematic view of a portion of the apparatus of Figure 1 and taken generally in the direction of the arrow 6 of Figure l;
Figure 7 is a partial, elevational view, taken generally along the line 7-7 o~ Figure 6;
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~3~ 4 ~ igure 8 is a diagram illustrating the motion of the devices o~ the apparatus of this invention;
Figures 9-12 are side, elevational, schematic ,, views illustrating a portion of the apparatus shown in Figure 6 witll the devices in various positions during operation o~ the apparatus of this invention;
Figure 13 is a top pexspective view of an elastic leg disposable di,aper produced by the ~' :
apparatus and process of this inventlon and shown in generally relaxed condition;
Figure 1~ is a top perspective view of .
interconnected d.iapers produced by,the apparatu~
of Figure l; and .
Figure 15 is a sectional view through the diaper o Figure 13 and taken generally along the line 15-15 of Figure 13.
De-tai.led Descrlption of the Invention ' In.the drawings, Figures 1~12 illustrate the ':
appara~.us and proaess of thi:s invention for attaching elastic stxips during the manuacture of elastic leg disposable di~apers and,Figures 13-15 illustrate ~ ' the resulting elastic ~leg disposable diaper product. `:.
: : Referring fLrstly to the elas,-tic leg disposable :
diaper product produced by the apparatus of this `
inven~ion for purposes of background, the improved elastic leg disposable diaper, as discussed more fully in th3~o~e3lidentified co-pending application , ~ Serial No. ~6t~R~ o the assignee of this invention, is referred to generally by the reference numeral lO. The diaper lO is preferably of generally hour-glass configuration and has a c~ntral crotch area ,, C and outer waist areas W designed to be placed around and fit the crotch and waist of the wearer when the diaper lO is placed on the wearer in conventional ~:
35 manner. The diaper 10 urther includes a 1uid- .
permeable top cover sheet ll, a 1uid impermeable bottom cover sheet 12 and a fluid`absorbent interior .. .... . .
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pad 13, all OJ' which may be of conv~ntional construction.
Tl~e~ disposable diaper 10 .is secured along its longitudinal and transverse edges by suitable adhes.ive or other attachment means 14 which secures the top cover sheet 11 and the bottom cover sheet 12 and generally provides an envelope around the interior pad 13 which is unsecured at its longitudinal edges and in the central crotch area C to either the top cover sheet or hottom cover sheet to allow the interior pad 13 to conform to the shape of the wearer when placed in position on the wearer.
The diaper 10 further includes elastic strips 16 extending and being secured by adhesive or other sui~able means 17 to the diaper 10 continuously 15 along the full length of the outside longitudinal ;
edges of the diaper 10. The elastic strips 16 are secured in the crotch ar.ea C in stretched elastically-contractible condition forming gathered and extendible side portions P in the crot~h area fol^ elastic conformance with the legs o the wearer and are secured in the -~aist areas W in less elastically-contractible or relaxed condition so as to provide less or no gathering of the side portions of th~ wais~ areas W.
Refe~ring now to the apparatus o the present invention, Figure 1 illustrates schematically an apparat~s for manufacturing elastic leg disposable diapers 10 utilizing the apparatus of this invention for attaching elastic strips 16 during the manufacture of such elastic le~ disposable diapers 10. The apparatus of this invention is shown schematically therein and many of the drives of the overall diaper manufactur-ing apparatus are eliminated for purposes of clari.ty ~;
o the disclosure and such drives or other devices may be easily desi.gned by those with ordinary skill in the art. However, details of construction and ~.
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operation of apparatus for manufacturlng disposable diapers may be seen inco pending Canadian application Serial No. 347,782 9 filed March 17, 1980, and prior U.S. Patents Re. 28,139 and 31984~272~ all of wnlch are assigned to the assignee of the present invention and which are applicable for use with the apparatus for attaching elastic strips of ~he present invention.
In Flgure 1, connected multi-layer interior absorbent pads 13 are shown being fed through spaced-apart pairs of driven feed rolls 65, 66 between which is provided a pad severing means in the form of a rotating cuttlng roll 67 having a knife blade 68 thereon and an anvil roll 69 which operate to intermittently cut the interconnected multi-layer interior pads 13 transversely for separation of the interconnected pads 13. The driven feed rolls 66 are driven somewhat faster than the driven feed rolls 65 to effect an overfeeding of the severed interior pads 13 for spacing of the interior pads 13 apart in the further fabrication of the disposable diapers 10 .
Immediately prior to the feed rolls 66, the top cover sheet 11 is fed from a suitable source of supply to feed rolls 66 through a glue applicator 71 which applies the glue or adhesive 14 of a suitable type in a predetermined pattern across the top cover sheet 11 at spaced locations and along the longitudinal edges for purposes of gluing the transverse and longi-tudinal edges of the ultimately fabricated disposable diaper 10 together.
Glue applicator 71 may comprise any suitable glue applicator for the above purpose and as illustrated herein may include a glue applic~tor roll 72 having indentations or cups 72' therein which collectively are of the pre-determined configuration of the areas for receiving adhesive 14. The appli-cator roll 72 may pass through an adhesive supply tank 73 for containing a supply of the adhesive 14.
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~8-Simultaneously with the above, the ~ottom cover sheet 12 is ~ed from a source of supply to feed rolls 66 and into superimposed position under the spaced-apart interior pads 13 and top cover sheet 11 so that all of these components are in superimposed position. The top cover sheet 11 and bottom cover sheet 12 are pressed into contact wi.th each other by the feed rolls 66 and subsequent rolls and are adhesively secured together along longitudi.nal edges `.
and trans~ersely between the separated and spaced-apart interior pads 13 to form serially-interconnected disposable diapers 10 r as shown generally in Figures 1 and 14l which are continuously fed through the remaining portions of the apparatus of Figure 1 by lS suitable feeding means.
These seriall~-interconnected diapers 10 are fed through a series of mechanlsms,no-t shown, and are ultimately fed between cutter roll 75 and anvil roll 76 which cut the serially-lnterconnected diapers 10 transversely between interior pads 13 to form individual diapers 10.
Cooperating with the above-described apparatus for manufacturing disposable diapers 10, apparatus in accordance with this invention is provided for 25 attaching elastic strips 16 during the manufacture .~
of such disposable diapers 10~ Thls apparatus includes .-means for alternately stretching and relaxing predetermined lengths of elastic strips for adhesive attachment of the stretched elastic lengths S to the crotch :.
area C and the more relaxed lengths R to the outer -waist areas W continuously along the longitudinal edges of the diaper, as may be seen particularly .: :
in Figures 14 and 15.
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g This apparatus comprises, firstly, means for feediny continuous elastic strips 16 from any ..
suitable source of supply (not shown ) at a predetermined constant rat~ into desired posltion ~or adhesive 5 attachment in the diapers~ As illustrated particularly ~.
in Figures 3 and 4, the feeding means may include driven feed rolls 20 commonly mounted on a driven shaft 21 for receiving the elastic strips 16 from a suitable source o~ supply ~not shown). From the feed rolls 20, the elastic strips are ~ed into engagement with ~he bottom cover sheet 12 for immediate adhesive attachment thereto and are then fed by the feed rolls 66 into position with the ~emaining:components of the disposable diapers 10, as shown in Figure l.
The drive shaft 21 is driven ~y a suitable chain drive 22 from a shaft 23 which may, in turn, be driven by suitable drive mechanisms from the diaper fabricating machi.ne (not snown) at a preaetermined constant rate.
The means for alternately stretching and relaxing predetermined lengths of the elastic strips 16 further includes two spaced-apar-t nipping means cooperating with the feeding means and enga~ing the elastic strips 16 during the feeding thereof and defining a predetermined distance of travel of the elastic strips 16 between the nipping means. In the embodiment o~ the apparatus illustrated herein, the two spaced-apart nipping means comprise the feeding rolls 20 and cooperating gui.de rolls 24 which are suitably mounted for pivotal biased engagement with - 30 the feed rolls 20, as shown in Figure 6, and the elastic strips 16 pass in generally an S-shaped path around the feed rolls 20 and the guide rolls 24 and .
are nipped therebetween to form the first nipping means. The second nipping means consists of a pair 3~ of opposed rolIs 26, 27 which are mounted for nipping engagement with each other in any suitable manner ,d and are spaFed from the first nippin means 20, 24 ., - .
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~10--to form a predetermined distance of travel of the elastic strips therebetween, a~ may he seen in Figure 6.
This second nipping means 26, 27 also receives the bottom cover sheet 12 so that the elastic strips 16 are adhesive-5 ly attached to this diaper component at this point. .:
From the nipping means formed by the rolls20, 24, the elastic strips 16 pass over and into contact Wit}l a driven adhesive applica~or roll 28 which includes cups or indentations 28' therein for picking 10 up adhesive 17 as it passes through a supply tank 29 -:
containing such adhesive 17. The applicator roll 28 is adapted to apply adhesive continuously along one of the faces of each of the elastic strips 16 as they are fed past the driven applicator roll 28. The ~
15 driven applicator roll 28 may:also be in nipping ~:
engagement with the guide rolls 24 and constitute the first nipping means; The adhesive 17 is desirably of a fast-acting type since ~he elastic strips are being secured in both the stretched and relaxe~ condition and .
20 the adhesive must set up as soon as the elastic strips .;
are moved into contact wi:th one of the components of the disposable dia~er 10, such as the bottom cover sheet 12 in the case of the apparatus illustrated herein.
: : The means for alternately stretching and relaxing predetermined lengths of the elastic strips 16 further comprises movable means, such as rolls : . .
30, positioned for engaging the elastic strips 16 as they are fed between the nipping means 20, 24 or 24, 48 and 26, 27 and foralternately moving to ::`
: 30 other positions (as shown in Figures 9-12) to vary the distance of travel of the elastic strips 16 between -such nipping means for:alternately stretching and relaxing leng-ths of the elastic strips 16.
Means àre connected with the elastic str.ip engaging roll means.30 for moving same and comprise a .p.iston and cylinder 32, 33 connected tD the roll means:30.and mounted for alternate . , - :
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quick movement to and from a contracted position ~ :
(dotted line position of Figure lO and solid line position Qf Figure ll) and an extended posi.tion (solid ~:
line positions of Figures 9, lO and 12~ for alternately moving the elastic strip engaging roll means 30 quickly to a posit.ion for increasing the distance of travel of the elastic strips 16 between the nipping means for st.retching the lengths S of elastic strips 16 alld then quickly to a position decreasing the distance of travel o~ the elastic strips 16 for relaxing leng*hs R of the elastic strips 16, ::
There is further provided a cran~ means includin~ a rotatlng crank disc 35 and a crank arm which is form~d by the piston and cylinder 32, 33 and has one end eccentrically pivo-tally mounted on the rotating crank disc and the other end carrying the elastic s~ip engaging roll means 30 for translating- the rotary motion of the crank disc 35 to incremental reclprocation of ., the elastic strip engaging roll means 30 for a:lternately moving the elastlc strip~engaging roll means 30 to pos:itions incrementally further incxeasin~ the distanc(-~
of travel of the elas;tic strips 16 after the increase ~;
thereof by the piston and cylinder 32, 33 to maintain 25 the stretching of;the lengths S of elastic strips .~.
16 during the:feeding thereof (as is illustrated -during rotation of the crank disc from the position of Figure lO to the position of Figure ll) and then`
to positions incrementally further decreasing the 30 distance of travel of:the elastic strips~l6 after :
the decrease thereof by the piston and cylinder means 32, 33 to maintain the relaxing of the lengths R
of elastic strips 16 during the -feeding thereof (as illus-trated durlng the rotation of the crank disc 35 from the position shown in Figure 11 to the position shown in Figure lO).
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The means for alternately stretching and relaxing predeterrnined lengths of the elastic strips 16 further comprises timed control means (a schematic of which is illustrated in Figure 5) connected with .and controlling operation of the piston and cylinder 32, 33 and the crank means 35, 32 and 33, which form the means for moviny-the elastlc stri.p engaging roll means 30, in correlation wi:th the'spebd of movement o~ the diapers 10 through the assembly machine and the lengths of the longitud.~nal edges of t.he crotch area C and the waist areas W '~
to which alternate stretched and relaxed lengths S, R of the elastic strips 16 are to he attached. .~:
As shown in Figure 5, this timed control means may comprise a source of pressurized air 40 which pro~Jides pressurized air to a pair of conduits ~1, 4~ throug}l pressure reguIating valves 43, ~4 and to electrically operated valves 45, 46. From the valves 45, 46 the air aonduits 41, 42 extend 20 to opposite sides of the cylinder 33 for respective ~'~
actuation of the piston and cylinder 32, 33 for quick ':
movement to the extended positiGn and the contracted ,!
position. The valves 45 and 46 are controlled for .
alternate actuation by electrical switches 47, 48 which are controlled by cams 49, S0 mounted on a common shaft 51 driven by a chain or ~elt drive 52 from a driven shaft 53 which carries and drives the crank disc 35. The shaft 53 is connected by chain or belt drive 54 to driven shaft 23 which is driven 3G from drive mechanisms of the diaper assembly machine' in timed correlation with the drives for feeding the diapers 10 through the assembly machine during ~;
their fabrication.
For stabilizing movement of the strip engaging 35 rolls 30, they are mounted on a comrnon shaft 56,attached . :
to the piston 32 and which carries pinions 57 positioned .
'' for up and down movemen~ in racks 58. . .: '.-..................... ,;
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For operation of the above-described apparatus for attaching elastic stri.ps 16 in elastic leg disposable diapers 10 during the manufacture of such diapers 10 in the assembly machine, the following operation S and process may be uti~ized.
A typical di.sposable diaper 10 is approximately 17.8 inches in length and the central crotch area C would be approximately 8.9 inches in length and the outer waist areas 4.45 inches in length for a con~ined length of ~.9 inches. Therefore, in ordex to attach relaxed lengths R and stretched lengths S of the continuous elastic strips 16 alternately ~?, to the waist areas W and the crotch areas C of the interconnected diapers 10, as shown in Figure 14, a relaxed length R of elastic strips 16 of approximately 8.9 inches must be fed by the apparatus of this inventi.on into adhesive en~agement in proper position along the longitudiIlal edges of the interconnected diapers 10 and then a stretched length 5 of the elastic strips 16 of approximately ~.9 inches must he fed into position in the diaper 10 which requires stretching of the stretched length S to approximately twiee its original length which wlll result in the feeding of approximately
4.45 inches o~ unstretched elastic strips 16 for attachment in the crotch area C.
This stretching and relaxing is accomplished by actuation of the piston and cylinder mechanism 32, 33 from its extended position (Figure 9) which feeds the elastic s-trlps 16 in substantially relaxed condition into desired positions for attachment along a~uttin~ waist areas W of two interconnected diapers to the contracted position (dotted line position :~
of Figure 10) which doubles the length of txavel of the elastic strips 16 hetween nipping means and stretches the elastic strips 16 so that the same effective length of elastic strips 16 are fed into . ~ : :, ~ ':, :' ~ : , .
~ 37~44 position along the crotch area of the diaper lQ, while onl~ one-half that length or 4.45 inches of elastic strips are fed frQm the unstretched supply.
However, inasmuch as the elastic strips 16 are being ~ed at a constant rate rom the supply, which can be no more than 4~45 inches ~or the stretched lengths S and 8.9 inches for the relaxed lengths R or a total of 13.35 inches of unstretched elastic strips per 17.8 inch diaper,and because the feeding of elasti.c strips necessarily places some tenslon and causes some stretching and cannot be accomplished in a totally tensionless or relaxed condition, some means must be provided for cornpensating for the tension or stre-tch ~ :~
caused by normal feeding and fo.r the constant feeding rate which is in effect underfeeding for the relaxed leng-ths R and overfeeding for the stretched lengths S. This compensat;.on is provided by the motion of the crank means which incrementally further increases the distance of travel of the elastic strips S for ~`
20 a pre~determined period~of ti.me to maintain stretching -~
of the leng-thsS of the elastic strips 16 after stretching thereof by the pi~ston and cylinder 32, 33 and while they are being fed into position in the diapers 10 ~ :
and then incrementally further decreases the distance of travel of the elastic strips 16 for a predetermirled period of time after they have been relaxed by operation of the piston and cylinder 32, 33 to maintain the relaxing of the lengths R of elastic strips 16 while they are being fed into position in the diapers 10.
Referring now to the diagram of Figure 8 and Figures 9-12 which show relative positions of the piston and cylinder 32, 33 and the crank means 35 and 32, 33 during various positions of operation, it may be seen in Figure 9 ~hat when the crank means is in its 0 position which is the position in which the elastic strips 16 ~re being attached at the start ~.
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~ 1.5-of a waist area W of one of the interconnected diapers lO, the elastic stxips 16 are i.n a relatively relaxed condition. To maintain this relaxed condition during the feeding of the strips 16, the crank mechan.ism rotates around to its 90 pos.it.ion of Figure lO which in effect incrementally decreases the distance of travel of the elastic strips 16 between nipping points to ~urther relax the elastic strips 16 for the purposes discussed above and as indicated in the diagram of Figure 8. At this position, the piston and cylinder mechanism is operated by the opening of valve 46 through the closing of switch 48 by cam 50 to move the piston and cylinder 32, 33 to its contracted position as shown in dotted lines in Figure lO. This immedia-tely doubles the length of the path of travel of the elastic strips 16 between nipping points for stre-tching the lengths S of elastic strips 16~ This stretch is maintained for a predetermined period of time during rotation of the crank disc 35 to its 270 position as shown in Figure ll during which the predetermined distance of travel of the elastic strips 16 is incrementally further increased by effective downward movement of the roll 30 to the position shown in Figure ll and as indicated in the diagram of Figure 8. At this point, the piston and cylinder mechanism 32, 33 is operated by the opening of valve 45 by the switch 47 being closed by cam 49 to move the piston and cylinder 32, 33 to its extended position, as:.indicated in dotted lines in ~igure ll and in solid~
lines in Figure 12, for quickly relaxing the elastic strips 16 as indicated in the diagram of Figure 8.
This reIaxing is maintained during the next 90 of rotation of the cam disc 35 by .incrementally further decreasing the predetermined distance of travel of the elastic strips 16 between nipping points, as indicated in the diagram of Figure 8, through the : moving of the roll 30 upward as indica~ed in dotted ' , 37~
l~nes in Figure 12. The cycle of operation of alternate-ly stretching and relaxing the elastic strips 16 for applicati.on to one disposable diaper 10 has now been completed and the cycle is repeated.
As will be readily understood by those with ordinary skill in the art, it is difficult if not impossible to obtain complete xelaxation of the elastic strips 16 during any feeding operation and the term "relaxed" as used herein and as results from a practical operation of the apparatus of this invention ancl tlle practice of the process herein is rela~ive and is i.ntended to cover the feedlng and application of elastic strips 16 in a "more relaxed"
condition when compared to the stretched condition.
Accordingly, the elastic strips 16 will probably always be some~hat or slight].y tensioned or stretched even in the waist areas W of the disposable diaper 10 .
- According]y, the present invention has pxovided a process of securing elastic strips 16 within longitudin-al edges of elastic leg disposable diapers 10 having a cen~ral crotch area C and outer waist areas W to form gathered and extendible side portions P in the crotch area C of the diapers 10 during manufacture of such diapers after severing of the interconnected diapers and allowing the stretched lengths S of the elastic strips 16 in the waist areas W to contract.
The process of this invention comprises generally the steps of feeding continuous elastic strips 16 at a predetermined constant rate from a -supply into desired position in contact with the longitudinal edges of the diapers 10, wnile effecting adhesive securement therebetween along the entire length of the edges. Predetermined lengths of the continuous elastic strips 16 are alternately stretched and relaxed during the eeding step for securing ~, ~
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the stretched lengths S of the continuous elastic strips 16 to the crotch area C and the relaxed lengths R of the continuous elastic strips 16 to the waist areas W of the diapers. This step comprises nipping
This stretching and relaxing is accomplished by actuation of the piston and cylinder mechanism 32, 33 from its extended position (Figure 9) which feeds the elastic s-trlps 16 in substantially relaxed condition into desired positions for attachment along a~uttin~ waist areas W of two interconnected diapers to the contracted position (dotted line position :~
of Figure 10) which doubles the length of txavel of the elastic strips 16 hetween nipping means and stretches the elastic strips 16 so that the same effective length of elastic strips 16 are fed into . ~ : :, ~ ':, :' ~ : , .
~ 37~44 position along the crotch area of the diaper lQ, while onl~ one-half that length or 4.45 inches of elastic strips are fed frQm the unstretched supply.
However, inasmuch as the elastic strips 16 are being ~ed at a constant rate rom the supply, which can be no more than 4~45 inches ~or the stretched lengths S and 8.9 inches for the relaxed lengths R or a total of 13.35 inches of unstretched elastic strips per 17.8 inch diaper,and because the feeding of elasti.c strips necessarily places some tenslon and causes some stretching and cannot be accomplished in a totally tensionless or relaxed condition, some means must be provided for cornpensating for the tension or stre-tch ~ :~
caused by normal feeding and fo.r the constant feeding rate which is in effect underfeeding for the relaxed leng-ths R and overfeeding for the stretched lengths S. This compensat;.on is provided by the motion of the crank means which incrementally further increases the distance of travel of the elastic strips S for ~`
20 a pre~determined period~of ti.me to maintain stretching -~
of the leng-thsS of the elastic strips 16 after stretching thereof by the pi~ston and cylinder 32, 33 and while they are being fed into position in the diapers 10 ~ :
and then incrementally further decreases the distance of travel of the elastic strips 16 for a predetermirled period of time after they have been relaxed by operation of the piston and cylinder 32, 33 to maintain the relaxing of the lengths R of elastic strips 16 while they are being fed into position in the diapers 10.
Referring now to the diagram of Figure 8 and Figures 9-12 which show relative positions of the piston and cylinder 32, 33 and the crank means 35 and 32, 33 during various positions of operation, it may be seen in Figure 9 ~hat when the crank means is in its 0 position which is the position in which the elastic strips 16 ~re being attached at the start ~.
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~ 1.5-of a waist area W of one of the interconnected diapers lO, the elastic stxips 16 are i.n a relatively relaxed condition. To maintain this relaxed condition during the feeding of the strips 16, the crank mechan.ism rotates around to its 90 pos.it.ion of Figure lO which in effect incrementally decreases the distance of travel of the elastic strips 16 between nipping points to ~urther relax the elastic strips 16 for the purposes discussed above and as indicated in the diagram of Figure 8. At this position, the piston and cylinder mechanism is operated by the opening of valve 46 through the closing of switch 48 by cam 50 to move the piston and cylinder 32, 33 to its contracted position as shown in dotted lines in Figure lO. This immedia-tely doubles the length of the path of travel of the elastic strips 16 between nipping points for stre-tching the lengths S of elastic strips 16~ This stretch is maintained for a predetermined period of time during rotation of the crank disc 35 to its 270 position as shown in Figure ll during which the predetermined distance of travel of the elastic strips 16 is incrementally further increased by effective downward movement of the roll 30 to the position shown in Figure ll and as indicated in the diagram of Figure 8. At this point, the piston and cylinder mechanism 32, 33 is operated by the opening of valve 45 by the switch 47 being closed by cam 49 to move the piston and cylinder 32, 33 to its extended position, as:.indicated in dotted lines in ~igure ll and in solid~
lines in Figure 12, for quickly relaxing the elastic strips 16 as indicated in the diagram of Figure 8.
This reIaxing is maintained during the next 90 of rotation of the cam disc 35 by .incrementally further decreasing the predetermined distance of travel of the elastic strips 16 between nipping points, as indicated in the diagram of Figure 8, through the : moving of the roll 30 upward as indica~ed in dotted ' , 37~
l~nes in Figure 12. The cycle of operation of alternate-ly stretching and relaxing the elastic strips 16 for applicati.on to one disposable diaper 10 has now been completed and the cycle is repeated.
As will be readily understood by those with ordinary skill in the art, it is difficult if not impossible to obtain complete xelaxation of the elastic strips 16 during any feeding operation and the term "relaxed" as used herein and as results from a practical operation of the apparatus of this invention ancl tlle practice of the process herein is rela~ive and is i.ntended to cover the feedlng and application of elastic strips 16 in a "more relaxed"
condition when compared to the stretched condition.
Accordingly, the elastic strips 16 will probably always be some~hat or slight].y tensioned or stretched even in the waist areas W of the disposable diaper 10 .
- According]y, the present invention has pxovided a process of securing elastic strips 16 within longitudin-al edges of elastic leg disposable diapers 10 having a cen~ral crotch area C and outer waist areas W to form gathered and extendible side portions P in the crotch area C of the diapers 10 during manufacture of such diapers after severing of the interconnected diapers and allowing the stretched lengths S of the elastic strips 16 in the waist areas W to contract.
The process of this invention comprises generally the steps of feeding continuous elastic strips 16 at a predetermined constant rate from a -supply into desired position in contact with the longitudinal edges of the diapers 10, wnile effecting adhesive securement therebetween along the entire length of the edges. Predetermined lengths of the continuous elastic strips 16 are alternately stretched and relaxed during the eeding step for securing ~, ~
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the stretched lengths S of the continuous elastic strips 16 to the crotch area C and the relaxed lengths R of the continuous elastic strips 16 to the waist areas W of the diapers. This step comprises nipping
5 the elastic strips 16 during the feeding thereof ..
at spaced apart points to define a predetermined distance of travel of the elastic strips 16 between the nipping poi.nts, ~uickly increasing the distance of travel of the elastic strips 16 for stretching 10 lengths S of the elastic strips 16 and incrementally : :
further increasing the distance of travel of the elastic strips 16 for a predetermined time period to maintain the stretching of the lengths S of the elastic strips 16 while they are being fed into position in the diapers 10 and then quickly decreasing the distance of travel of the elastic strips S for relaxing leng-ths R of the elastic strips 16: and incrementally furthex decreas.ing the distance o~ travel of the elastic strips 16 for a predetermined:period of time 2~ to maintain the relaxing of the lengths R of th~ ~
elastic strips~16 while they are being.fed. into position :~ :
in the disposable diapers. Pre:erably, adhesive is applied continuously to the elastic strips during the feeding step along the entire length of the elastic 2S st~ips.16.
In the drawings and speci.fication, th.ere has been set forth a perferred embodiment of the invention and although specific terms are employed, .they are used in a generic and descriptive sense only and not for purposes of limitation.
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at spaced apart points to define a predetermined distance of travel of the elastic strips 16 between the nipping poi.nts, ~uickly increasing the distance of travel of the elastic strips 16 for stretching 10 lengths S of the elastic strips 16 and incrementally : :
further increasing the distance of travel of the elastic strips 16 for a predetermined time period to maintain the stretching of the lengths S of the elastic strips 16 while they are being fed into position in the diapers 10 and then quickly decreasing the distance of travel of the elastic strips S for relaxing leng-ths R of the elastic strips 16: and incrementally furthex decreas.ing the distance o~ travel of the elastic strips 16 for a predetermined:period of time 2~ to maintain the relaxing of the lengths R of th~ ~
elastic strips~16 while they are being.fed. into position :~ :
in the disposable diapers. Pre:erably, adhesive is applied continuously to the elastic strips during the feeding step along the entire length of the elastic 2S st~ips.16.
In the drawings and speci.fication, th.ere has been set forth a perferred embodiment of the invention and although specific terms are employed, .they are used in a generic and descriptive sense only and not for purposes of limitation.
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Claims (13)
1. In an apparatus for attaching elastic strips in elastic leg disposable diapers having gathered and extendible side portions in a crotch area during the manufacture of such diapers in an assembly machine and including means for alternately stretching and relaxing predetermined lengths of the elastic strips for adhesive attachment of the stretched lengths to the crotch area and the more relaxed lengths to outer waist areas continuously along the longitudinal edges of the diapers; the improvement of said means for alternately stretching and relaxing predetermined lengths of the elastic strips comprising:
means for feeding continuous elastic strips at a predetermined constant rate from a supply into desired positioned in the diapers for adhesive attachment therein;
two spaced apart nipping means cooperating with said feeding means and engaging the elastic strips during feeding thereof and defining a predetermined distance of travel of the elastic strips between said nipping means one of said nipping means being positioned at the point of adhesive attachment of the elastic strips in the diapers;
movable means positioned for engaging the elastic strips as they are fed between said nipping means and for alternately moving to other positions to vary the distance of travel of the elastic strips for alternately stretching and relaxing lengths of the elastic strips; and means connected with said elastic strip engaging means for moving same for quickly increasing the distance of travel of the elastic strips for stretching lengths of the elastic strips and incrementally further increasing the distance of travel of the elastic strips for a predetermined period of time to maintain the stretching of the lengths of the elastic strips while they are being fed into position in the diapers, and then quickly decreasing the distance of travel of the elastic strips for relaxing lengths of the elastic strips and incrementally further decreasing the distance of travel of the elastic strips for a predetermined period of time to maintain the relaxing of the lengths of elastic strips while they are being fed into position in the diapers.
means for feeding continuous elastic strips at a predetermined constant rate from a supply into desired positioned in the diapers for adhesive attachment therein;
two spaced apart nipping means cooperating with said feeding means and engaging the elastic strips during feeding thereof and defining a predetermined distance of travel of the elastic strips between said nipping means one of said nipping means being positioned at the point of adhesive attachment of the elastic strips in the diapers;
movable means positioned for engaging the elastic strips as they are fed between said nipping means and for alternately moving to other positions to vary the distance of travel of the elastic strips for alternately stretching and relaxing lengths of the elastic strips; and means connected with said elastic strip engaging means for moving same for quickly increasing the distance of travel of the elastic strips for stretching lengths of the elastic strips and incrementally further increasing the distance of travel of the elastic strips for a predetermined period of time to maintain the stretching of the lengths of the elastic strips while they are being fed into position in the diapers, and then quickly decreasing the distance of travel of the elastic strips for relaxing lengths of the elastic strips and incrementally further decreasing the distance of travel of the elastic strips for a predetermined period of time to maintain the relaxing of the lengths of elastic strips while they are being fed into position in the diapers.
2, In an apparatus, as set forth in Claim 1, in which said means for alternately stretching and relaxing predetermined lengths of the elastic strips further comprises timed control means connected with said means for moving said elastic strip engaging means for operating such means in timed correlation with the speed of movement of the diapers through the assembly machine and the lengths of the longitudinal edges of the crotch area and the waist areas to which alternate lengths of stretched and relaxed portions of the elastic tapes are to be attached.
3. In an apparatus, as set forth in Claim 1, in which said movable elastic strip engaging means comprises roll means.
4. In an apparatus, as set forth in Claim 1, in which said means for moving said elastic strip engaging means includes piston and cylinder means connected to said elastic strip engaging means and mounted for quick movement to and from a contracted position and an extended position for moving said elastic strip engaging means to the positions for stretching and relaxing the elastic strips.
5. In an apparatus, as set forth in Claim 1, in which said means for moving said elastic strip engaging means includes a crank means including a rotating crank disc and a crank arm having one end thereof eccentrically pivotally mounted on said rotating crank disc and the other end thereof carrying said elastic strip engaging means for translating the rotary motion of said crank disc to incremental reciprocation of said elastic strip engaging means for maintaining the stretching and relaxing of the elastic strips.
6. In an apparatus for attaching elastic strips in elastic leg disposable diapers having gathered and extendible side portions in a crotch area during the manufacture of such diapers in an assembly machine and including means for alternately stretching and relaxing predetermined lengths of the elastic strips for adhesive attachment of the stretched elastic lengths to the crotch area and the more relaxed lengths to the outer waist areas continuously along the longitudinal edges of the diapers; the improvement of said means for alternately stretching and relaxing predetermined lengths of the elastic strips comprising:
means for feeding continuous elastic strips at a predetermined constant rate from a supply into desired position in the diapers for adhesive attachment therein;
two spaced-apart nipping means cooperating with said feeding means and engaging the elastic strips during feeding thereof and defining a predetermined distance of travel of the elastic strips between said nipping means, one of said nipping means being positioned at the point of adhesive attachment of the elastic strips in the diapers;
movable roll means positioned for engaging the elastic strips as they are fed between said nipping means and for alternately moving to other positions to vary the distance of travel of the elastic strips for alternately stretching and relaxing lengths of the elastic strips; and means connected with said elastic strip engaging roll means for moving same and comprising piston and cylinder means connected to said roll means and mounted for alternate movement to and from a contracted position and an extended position for moving said elastic strip engaging roll means quickly to a position for increasing the distance of travel of the elastic strips for stretching the lengths of the elastic strips and then quickly to a position decreasing the distance of travel of the elastic strips for relaxing lengths of the elastic strips and a crank means including a rotating crank disc and a crank arm formed by said piston and cylinder means having one end thereof eccentrically pivotally mounted on said rotating crank disc and the other end thereof carrying said elastic strip engaging roll means for translating the rotary motion of said crank disc to incremental reciprocation of said elastic strip engaging roll means for alternately moving said elastic strip engaging roll means to positions incrementally further increasing the distance of travel of the elastic strips after the increase thereof by said piston and cylinder means to maintain the stretching of the lengths of elastic strips during the feeding thereof and then to positions incrementally decreasing the distance of travel of the elastic strips after the decrease thereof by said piston and cylinder means to maintain the relaxing of the lengths of elastic strips during the feeding thereof; and timed control means connected with and controlling operation of said piston and cylinder means and said crank means in correlation with the speed of movement of the diapers through the assembly machine and the lengths of the longitudinal edges of the crotch area and the waist area to which alternate stretched and relaxed lengths of the elastic strips are to be attached.
means for feeding continuous elastic strips at a predetermined constant rate from a supply into desired position in the diapers for adhesive attachment therein;
two spaced-apart nipping means cooperating with said feeding means and engaging the elastic strips during feeding thereof and defining a predetermined distance of travel of the elastic strips between said nipping means, one of said nipping means being positioned at the point of adhesive attachment of the elastic strips in the diapers;
movable roll means positioned for engaging the elastic strips as they are fed between said nipping means and for alternately moving to other positions to vary the distance of travel of the elastic strips for alternately stretching and relaxing lengths of the elastic strips; and means connected with said elastic strip engaging roll means for moving same and comprising piston and cylinder means connected to said roll means and mounted for alternate movement to and from a contracted position and an extended position for moving said elastic strip engaging roll means quickly to a position for increasing the distance of travel of the elastic strips for stretching the lengths of the elastic strips and then quickly to a position decreasing the distance of travel of the elastic strips for relaxing lengths of the elastic strips and a crank means including a rotating crank disc and a crank arm formed by said piston and cylinder means having one end thereof eccentrically pivotally mounted on said rotating crank disc and the other end thereof carrying said elastic strip engaging roll means for translating the rotary motion of said crank disc to incremental reciprocation of said elastic strip engaging roll means for alternately moving said elastic strip engaging roll means to positions incrementally further increasing the distance of travel of the elastic strips after the increase thereof by said piston and cylinder means to maintain the stretching of the lengths of elastic strips during the feeding thereof and then to positions incrementally decreasing the distance of travel of the elastic strips after the decrease thereof by said piston and cylinder means to maintain the relaxing of the lengths of elastic strips during the feeding thereof; and timed control means connected with and controlling operation of said piston and cylinder means and said crank means in correlation with the speed of movement of the diapers through the assembly machine and the lengths of the longitudinal edges of the crotch area and the waist area to which alternate stretched and relaxed lengths of the elastic strips are to be attached.
7. An apparatus for attaching elastic strips in elastic leg disposable diapers having gathered and extendible side portions in a crotch area during the manufacture of such diapers in an assembly machine, said apparatus comprising:
means for feeding continuous elastic strips at a predetermined constant rate from a supply into desired positions in the diapers for attachment therein;
means for applying adhesive continuously-along the elastic strips as they are being fed by said feeding means for adhesive attachment of the elastic strips in the diapers; and means fox alternately stretching and relaxing predetermined lengths of the elastic strips as they are being fed by said feeding means for adhesive attachment of the stretched lengths to the crotch area and the more relaxed lengths to the outer waist areas continuously along the longitudinal edges of the diapers, said means comprising two spaced apart nipping means cooperating with said feeding means and engaging the elastic strips during feeding thereof and defining a predetermined distance of travel of the elastic strips between said nipping means, one of said nipping means being positioned at the point of adhesive attachment of the elastic strips in the diapers, movable means positioned for engaging the elastic strips as they are fed between said nipping means and for alternately moving to other positions to vary the distance of travel of the elastic strips for alternately stretching and relaxing lengths of the elastic strips, and timed means connected with said elastic strip engaging means for moving same for quickly increasing the distance of travel of the elastic strips for stretching lengths of the elastic strips and incrementally further increasing the distance of travel of the elastic strips for a predetermined period of time to maintain the stretching of the lengths of the elastic strips while they are being fed into position in the diapers, and then quickly decreasing the distance of travel of the elastic strips for relaxing lengths of the elastic strips and incrementally further decreasing the distance of travel of the elastic strips for a predetermined period of time to maintain the relaxing of the lengths of elastic strips while they are being fed into position in the diapers.
means for feeding continuous elastic strips at a predetermined constant rate from a supply into desired positions in the diapers for attachment therein;
means for applying adhesive continuously-along the elastic strips as they are being fed by said feeding means for adhesive attachment of the elastic strips in the diapers; and means fox alternately stretching and relaxing predetermined lengths of the elastic strips as they are being fed by said feeding means for adhesive attachment of the stretched lengths to the crotch area and the more relaxed lengths to the outer waist areas continuously along the longitudinal edges of the diapers, said means comprising two spaced apart nipping means cooperating with said feeding means and engaging the elastic strips during feeding thereof and defining a predetermined distance of travel of the elastic strips between said nipping means, one of said nipping means being positioned at the point of adhesive attachment of the elastic strips in the diapers, movable means positioned for engaging the elastic strips as they are fed between said nipping means and for alternately moving to other positions to vary the distance of travel of the elastic strips for alternately stretching and relaxing lengths of the elastic strips, and timed means connected with said elastic strip engaging means for moving same for quickly increasing the distance of travel of the elastic strips for stretching lengths of the elastic strips and incrementally further increasing the distance of travel of the elastic strips for a predetermined period of time to maintain the stretching of the lengths of the elastic strips while they are being fed into position in the diapers, and then quickly decreasing the distance of travel of the elastic strips for relaxing lengths of the elastic strips and incrementally further decreasing the distance of travel of the elastic strips for a predetermined period of time to maintain the relaxing of the lengths of elastic strips while they are being fed into position in the diapers.
8. An apparatus, as set forth in Claim 7, in which said timed means for moving said elastic strip engaging means comprises piston and cylinder means connected to said elastic strip engaging means and mounted for quick movement to and from a contracted position and an extended position for moving said elastic strip engaging means to the positions for stretching and relaxing the elastic strips, and a crank means including a rotating crank disc and a crank arm formed by said piston and cylinder means and having one end thereof eccentrically pivotally mounted on said rotating crank disc and the other end thereof carrying said elastic strip engaging means for translating the rotary motion of said crank disc to incremental reciprocation of said elastic strip engaging means for maintaining the stretching and relaxing of the elastic strips.
9. Apparatus for manufacturing elastic leg disposable diapers having a central crotch area, outer waist areas and elastic extendible side portions in the crotch area; said apparatus including:
feeding means for superimposing a continuous fluid-permeable top cover sheet, a continuous fluid-impermeable bottom cover sheet and spaced-apart fluid-absorbent interior pads between the top and bottom cover sheets while feeding such components through said apparatus;
means cooperating with said feeding means for securing the top cover sheet and the bottom cover sheet together along longitudinal edges and transversely between the interior pads to form serially-interconnected disposable diapers;
means cooperating with said feeding means for attaching elastic strips continuously along the entire length of the longitudinal edges of each of the diapers and including timed means for alternately stretching and relaxing predetermined lengths of the elastic strips for adhesive attachment of the stretched lengths to the crotch area and the more relaxed lengths to the outer waist areas of the diapers comprising means for feeding continuous elastic strips having adhesive thereof at a predetermined constant rate from a supply into desired position in the diapers for adhesive attachment therein, two spaced-apart nipping means cooperating with said feeding means and engaging the elastic strips during feeding thereof and defining a predetermined distance of travel of the elastic strips between said nipping means, one of said nipping means being positioned at the point of adhesive attachment of the elastic strips in the diapers, movable means positioned for engaging: the elastic strips as they are fed between said nipping means and for alternately moving to other positions to vary the distance of travel of the elastic strips for alternately stretching and relaxing lengths of the elastic strips, and means connected with said elastic strip engaging means for moving same for quickly increasing the distance of travel of the elastic strips for stretching lengths of the elastic strips and incrementally further increasing the distance of travel of the elastic strips for a predetermined period of time to maintain the stretching of the lengths of the elastic strips while they are being fed into position in the diapers, and then quickly decreasing the distance of travel of the elastic strips for relax-ing lengths of the elastic strips and incrementally further decreasing the distance of travel of the elastic strips for a predetermined period of time to maintain the relaxing of the lengths of elastic strips while they are being fed into position in the diapers; and means for cutting the interconnected diapers individually between the interior pads to form individual diapers;
whereby, the stretched lengths of the elastic strips are contracted and form gathered and extendible side portions in the crotch area of the individual diapers.
feeding means for superimposing a continuous fluid-permeable top cover sheet, a continuous fluid-impermeable bottom cover sheet and spaced-apart fluid-absorbent interior pads between the top and bottom cover sheets while feeding such components through said apparatus;
means cooperating with said feeding means for securing the top cover sheet and the bottom cover sheet together along longitudinal edges and transversely between the interior pads to form serially-interconnected disposable diapers;
means cooperating with said feeding means for attaching elastic strips continuously along the entire length of the longitudinal edges of each of the diapers and including timed means for alternately stretching and relaxing predetermined lengths of the elastic strips for adhesive attachment of the stretched lengths to the crotch area and the more relaxed lengths to the outer waist areas of the diapers comprising means for feeding continuous elastic strips having adhesive thereof at a predetermined constant rate from a supply into desired position in the diapers for adhesive attachment therein, two spaced-apart nipping means cooperating with said feeding means and engaging the elastic strips during feeding thereof and defining a predetermined distance of travel of the elastic strips between said nipping means, one of said nipping means being positioned at the point of adhesive attachment of the elastic strips in the diapers, movable means positioned for engaging: the elastic strips as they are fed between said nipping means and for alternately moving to other positions to vary the distance of travel of the elastic strips for alternately stretching and relaxing lengths of the elastic strips, and means connected with said elastic strip engaging means for moving same for quickly increasing the distance of travel of the elastic strips for stretching lengths of the elastic strips and incrementally further increasing the distance of travel of the elastic strips for a predetermined period of time to maintain the stretching of the lengths of the elastic strips while they are being fed into position in the diapers, and then quickly decreasing the distance of travel of the elastic strips for relax-ing lengths of the elastic strips and incrementally further decreasing the distance of travel of the elastic strips for a predetermined period of time to maintain the relaxing of the lengths of elastic strips while they are being fed into position in the diapers; and means for cutting the interconnected diapers individually between the interior pads to form individual diapers;
whereby, the stretched lengths of the elastic strips are contracted and form gathered and extendible side portions in the crotch area of the individual diapers.
10. An apparatus, as set forth in Claim 9, in which said timed means for moving said elastic strip engaging means comprises piston and cylinder means connected to said elastic strip engaging means and mounted for quick movement to and from a contracted position and an extended position for moving said elastic strip engaging means to the positions for stretching and relaxing the elastic strips and crank means including a rotating crank disc and a crank arm formed by said piston and cylinder means and having one end thereof eccentrical-ly pivotally mounted on sald rotating crank disc and the other end thereof carrying said elastic strip engaging means for translating the rotary motion of said crank disc to incremental reciproca-tion of said elastic strip engaging means for maintaining the stretching and relaxing of the elastic strips.
11. A process of securing elastic strips within longitudinal edges of elastic leg disposable diapers having a central crotch area and outer waist areas to form gathered and extendible side portions in the crotch area of the diapers during manufacture of such diapers; said process comprising the steps of:
feeding continuous elastic strips at a predetermined constant rate from a supply into desired position within the longitudinal edges of the diapers, while effecting adhesive securement therebetween along the entire length of the edges; and alternately stretching and relaxing predetermined lengths of the continuous elastic strips during said feeding step, while securing the stretched lengths of the continuous elastic strips to the crotch area and the relaxed lengths of the continous elastic strips to the waist areas of the diapers, comprising nipping the elastic strips during the feeding thereof at spaced-apart points to define a predetermined distance of travel of the elastic strips between the nipping points, quickly increasing the distance of travel of the elastic strips for stretching lengths of the elastic strips and incrementally further increasing the distance of travel of the elastic strips for a predetermined period of time to maintain the stretching of the lengths of the elastic strips while they are being fed into position in the diapers, and then quickly decreasing the distance of travel of the elastic strips for relaxing lengths of the elastic strips and incrementally further decreasing the distance of travel of the elastic strips for a predetermined peri-od of time to maintain the relaxing of the lengths of elastic strips while they are being fed into position in the diapers.
feeding continuous elastic strips at a predetermined constant rate from a supply into desired position within the longitudinal edges of the diapers, while effecting adhesive securement therebetween along the entire length of the edges; and alternately stretching and relaxing predetermined lengths of the continuous elastic strips during said feeding step, while securing the stretched lengths of the continuous elastic strips to the crotch area and the relaxed lengths of the continous elastic strips to the waist areas of the diapers, comprising nipping the elastic strips during the feeding thereof at spaced-apart points to define a predetermined distance of travel of the elastic strips between the nipping points, quickly increasing the distance of travel of the elastic strips for stretching lengths of the elastic strips and incrementally further increasing the distance of travel of the elastic strips for a predetermined period of time to maintain the stretching of the lengths of the elastic strips while they are being fed into position in the diapers, and then quickly decreasing the distance of travel of the elastic strips for relaxing lengths of the elastic strips and incrementally further decreasing the distance of travel of the elastic strips for a predetermined peri-od of time to maintain the relaxing of the lengths of elastic strips while they are being fed into position in the diapers.
12. A process, as set forth in Claim 11, further including the step of applying adhesive continuously to the elastic strips during said feeding step along the entire length of the elastic strips.
13. A process for manufacturing elastic leg disposable diapers having a central crotch area, outer waist areas and elastic extendible side portions in the crotch area, said process comprising the steps of:
superimposing a continuous fluid-permeable top cover sheet, a continuous fluid-impermeable bottom cover sheet and spaced-apart fluid-absorbent interior pads;
securing the top cover sheet and bottom cover sheet together along longitudinal edges and transversely between the interior pads to form serially-interconnected disposable diapers;
securing elastic strips continuously along the entire length of the longitudinal edges of each of the diapers including feeding continuous elastic strips at a predetermined constant rate from a supply into desired position in contact with the longitudinal edges of the diapers, while effecting adhesive securement therebetween along the entire length of the edges, and alternately stretching and relaxing predetermined lengths of the continuous elastic strips during said feeding step, while securing the stretched lengths of the continuous elastic strips to the crotch area and the relaxed lengths of the continuous elastic strips to the waist areas of the diapers, comprising nipping the elastic strips durng the feeding thereof at spaced-apart points to define a predetermined distance of travel of the elastic strips between the nipping points, quickly increasing the distance of travel of the elastic strips for stretching lengths of the elastic strips and incremental-ly further increasing the distance of travel of the elastic strips for a pre-determined period of time to maintain the stretching of the lengths of the elas-tic strips while they are being fed into position in the diaper, and then quick-ly decreasing the distance of travel of the elastic strips for relaxing lengths of the elastic strips and incrementally further decreasing the distance of travel of the elastic strips for a predetermined period of time to maintain the relaxing of the lengths of elastic strips while they are being fed into position in the diapers; and cutting the interconnected diapers transversely between interior pads to form individual diapers;
whereby, the stretched lengths of the elastic strips will contract and form gathered and extendible side portions in the crotch areas of the indiv-idual diapers.
superimposing a continuous fluid-permeable top cover sheet, a continuous fluid-impermeable bottom cover sheet and spaced-apart fluid-absorbent interior pads;
securing the top cover sheet and bottom cover sheet together along longitudinal edges and transversely between the interior pads to form serially-interconnected disposable diapers;
securing elastic strips continuously along the entire length of the longitudinal edges of each of the diapers including feeding continuous elastic strips at a predetermined constant rate from a supply into desired position in contact with the longitudinal edges of the diapers, while effecting adhesive securement therebetween along the entire length of the edges, and alternately stretching and relaxing predetermined lengths of the continuous elastic strips during said feeding step, while securing the stretched lengths of the continuous elastic strips to the crotch area and the relaxed lengths of the continuous elastic strips to the waist areas of the diapers, comprising nipping the elastic strips durng the feeding thereof at spaced-apart points to define a predetermined distance of travel of the elastic strips between the nipping points, quickly increasing the distance of travel of the elastic strips for stretching lengths of the elastic strips and incremental-ly further increasing the distance of travel of the elastic strips for a pre-determined period of time to maintain the stretching of the lengths of the elas-tic strips while they are being fed into position in the diaper, and then quick-ly decreasing the distance of travel of the elastic strips for relaxing lengths of the elastic strips and incrementally further decreasing the distance of travel of the elastic strips for a predetermined period of time to maintain the relaxing of the lengths of elastic strips while they are being fed into position in the diapers; and cutting the interconnected diapers transversely between interior pads to form individual diapers;
whereby, the stretched lengths of the elastic strips will contract and form gathered and extendible side portions in the crotch areas of the indiv-idual diapers.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US115,280 | 1980-02-08 | ||
| US06/115,280 US4261782A (en) | 1980-02-08 | 1980-02-08 | Apparatus for attaching elastic strips during the manufacture of elastic leg disposable diapers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1137044A true CA1137044A (en) | 1982-12-07 |
Family
ID=22360346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000348633A Expired CA1137044A (en) | 1980-02-08 | 1980-03-28 | Apparatus and process for attaching elastic strips during the manufacture of elastic leg disposable diapers |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4261782A (en) |
| CA (1) | CA1137044A (en) |
| MX (1) | MX6443E (en) |
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| DE1282912B (en) * | 1966-04-30 | 1968-11-14 | Siempelkamp Gmbh & Co | Device for tensioning the longitudinal ropes, especially steel or plastic ropes, of reinforcing inserts for conveyor belts |
| US3860003B2 (en) * | 1973-11-21 | 1990-06-19 | Contractable side portions for disposable diaper | |
| US3984272A (en) * | 1974-07-25 | 1976-10-05 | Riegel Textile Corporation | Method and apparatus for successively forming disposable diapers |
| US3919876A (en) * | 1974-11-11 | 1975-11-18 | Du Pont | Toggle press |
| US4081301A (en) * | 1975-10-30 | 1978-03-28 | The Procter & Gamble Company | Method and apparatus for continuously attaching discrete, stretched elastic strands to predetermined isolated portions of disposable abosrbent products |
| US4050462A (en) * | 1976-03-29 | 1977-09-27 | Kimberly-Clark Corporation | Disposable diaper with elastically constricted crotch section |
-
1980
- 1980-02-08 US US06/115,280 patent/US4261782A/en not_active Expired - Lifetime
- 1980-03-28 CA CA000348633A patent/CA1137044A/en not_active Expired
- 1980-05-28 MX MX808851U patent/MX6443E/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5509915A (en) | 1991-09-11 | 1996-04-23 | Kimberly-Clark Corporation | Thin absorbent article having rapid uptake of liquid |
Also Published As
| Publication number | Publication date |
|---|---|
| MX6443E (en) | 1985-05-31 |
| US4261782A (en) | 1981-04-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |