CA2381874C - Fastener closure arrangement for flexible packages - Google Patents

Fastener closure arrangement for flexible packages Download PDF

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Publication number
CA2381874C
CA2381874C CA2381874A CA2381874A CA2381874C CA 2381874 C CA2381874 C CA 2381874C CA 2381874 A CA2381874 A CA 2381874A CA 2381874 A CA2381874 A CA 2381874A CA 2381874 C CA2381874 C CA 2381874C
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CA
Canada
Prior art keywords
flexible package
reclosable flexible
fastener
package
fastener tracks
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 - Fee Related
Application number
CA2381874A
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French (fr)
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CA2381874A1 (en
Inventor
Panagiotis Kinigakis
Orestes Rivero
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Intercontinental Great Brands LLC
Original Assignee
Kraft Foods Global Brands LLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kraft Foods Global Brands LLC filed Critical Kraft Foods Global Brands LLC
Publication of CA2381874A1 publication Critical patent/CA2381874A1/en
Application granted granted Critical
Publication of CA2381874C publication Critical patent/CA2381874C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00Details of, or accessories for, sacks or bags
    • B65D33/16End- or aperture-closing arrangements or devices
    • B65D33/18End- or aperture-closing arrangements or devices using adhesive applied to integral parts, e.g. to flaps
    • B65D33/20End- or aperture-closing arrangements or devices using adhesive applied to integral parts, e.g. to flaps using pressure-sensitive adhesive
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00Details of, or accessories for, sacks or bags
    • B65D33/16End- or aperture-closing arrangements or devices
    • B65D33/25Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
    • B65D33/2541Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor characterised by the slide fastener, e.g. adapted to interlock with a sheet between the interlocking members having sections of particular shape

Abstract

A flexible package is provided with a shrouded slider fastener closure. A side seal forming the package is enlarged at its upper end to provide a smooth transition of product dispensed from the package, and to shield the slider during dispensing. The enlarged side seal portion is spaced from the fastener tracks. The fastener tracks are deformed to provide a stop, spaced from the side seals, to limit slider movement. A stop of reduced area, enlarging the package opening, is made possible.

Description

_ 1 _ FASTENER CLOSURE ARRANGEMENT FOR FLEXIBLE PACKAGES
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention pertains to the closure of flexible packages, such as plastic bags, and in particular to fastener closures employing sliders.
2. Description Of The Related Art With the recent emphasis in providing consumers with bulk quantities of v<~rious commodities, such as food products, reclosable packages have become increasingly popular. One of the most popular means of providing reclosability is to employ zippers of various types, particularly zippers which are compatible' with flexible packages of plastic film construction. Manufacturers of food products and other commodities are concerned with filling the contents of a flexible package as quickly and economically as possible. It is important that the opening provided by the fastener be made as large as practically possiblf=_. Consumers or other end users also prefer large sized openings for easy extraction of products from the package interior. Even with large openings, however, products within the package may interfere with fastener operation when product poured or otherwise dispensed from the package becomes entrained in the fastener components.
Other improvements to flexible reclosable packages are being sought. For example, when handling products comprised of numerous small pieces, such as shredded cheese or cereal, for example, it is generally desirable to have the package formed into a pouch which is open at one end, or along one side, so as to allow product to be poured or shaken through the reclosable opening. It is desirable that the product be allowed to freely flow past the reclosable opening. Preferably, the path taken by the product within the package should be made as smooth as possible.
Although improvements have been made in the art of plastic welding and joining, manufacturers of consumer products employing high speed production techniques are continually seeking improved package forming methods and equipment. Concern has been focused on t:he formation of stop members which limit the travel of a sliding closure traveling along fastener tracks. Any reduction in the time needed to form these and other package features can result in substantial cost savings.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a shrouded flexib:Le package with an improved fastener closure.
Another obj ect of t:he present :Lnvention is to provide reclosable packages having fastener sliders which are protected during shipment and display, and afterwards, when the package contents arE~ poured out or otherwise extracted.
A further object of the present invention is to provide a shrouded r_eclosable package having improved arrangements for hanging display.
Yet another object of the present invention is to provide a shroudE_d reclosable plastic package having a slider fastener with improved containment, of the slider in a manner which also optimizes the sized of the bag opening.
A further object of the present. invention is to provide a shrouded ,plastic bag having a :glider fastener with an improved end or "crush" seal. of t=he fastener tracks.
These and other objects of the present invention are attained in a reclosable f:Lexible package comprising opposed i_ront and rear panels that have sides joined together to form an interior and a package opening communicating with said interior. The reclosable flexible package has first and second int:erlockable fastener tracks configurable in an inter:Cocked, closed position and an unlocked open position. :Ct has a slider movable along fastener tracks to configure tracks in interlocked position to c:Lose opening anti to configure fastener tracks in unlocked position so as to allow access through open_Lng to package interior. The fastener tracks have opposed ends :Located adjacent opposed sides of front and rear panels. The stops adjacent ends of fastener tracks interfere with and prevent travel of slider beyond fastener tracks. A side seal of pre-selected width join; together one side of front and rear panels. A shroud covers slider and at least the major portion of fastener tracks. V~leakening portions extend adjacent fastener tracks and severe the remainder of reclosable flexible package.
It has been determined that, in a practical commercial environment, it is difficult too employ conduction heat sealing techniques to form the slider stop. It is preferred that the stop be formed using ultrasonic sealing techniques, as these afford greater control over dimension and shape. This :is important when the maximum number of advantages accorded the present invention are being sought, since the mars, and particularly the frontal surface area of the stop is reduced to the greatest extent possible.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a fragmentary front E~levational view of a flexible package according to principles of the present invention;
FIG. 2 is a fragmentary cross-sectional view taken along the line 2-2 of FIG. 1;
FIG. 3 is a fragmentary end view indicated by line 3-3 of FIG. 1;
FIG. 4 is fragmentary front elevational view showing construction of the flexible package;
FIG. 5 is a top plan view of the slider member;
FIG. 6 is a front elevational view thereof;
FIG. 7 is <~n elevational view from one end thereof;
FIG. 8 is an elevational view i=rom the other end thereof;
FIG. 9 is an end view of a fastener track sub-assembly;
FIG. 10 is a cross-sectional view, in schematic form, taken along the line 10-10 of FIG. 1 with the slider moved to the left;
FIG, 10a is a fragmentary view, of FIG. 10 shown on an enlarged scale;
FIGS. lOb and 10c show alternative seal constructions;
FIG. 11 is a fragmentary front elevational view showing contents being poured from the flexible package;
FIG. 12 is a fragmentary front elevational view showing contents of a prior art package;
FIG.13 is a fragmentary front elevational view showing a flexible packagE= according to principles of the present invention;
FIG. 14 is a front elevational view of an alternative embodiment of a flexible pac)cage according to principles of the present invention;
FIG. 15 is a fragmentary elevational view of a shrouded flexible package according to principles of the present invention;
FIG. 16 is a fragmentary cross-sectional view taken along line 16-16 of FIG. 15;

FIG. 17 is a fragmentary end view of the package of FIG. 15;
FIG. 18 is a fragmentary elevational view of a further embodiment of a flexible package according to principles of the present invention;
FIG. 19 is a fragmentary elevational view of another embodiment of a shrouded flexible package;
FIG. 20 is a cross-sectional view taken along the line 20-20 of F:IG. 15;
FIG. 21 is a cross-sectional view similar to that of FIG. 20, shown with the schematic depiction of tooling to form the flexible package;
FIG. 22 is a fragmentary elevational view of a further embodiment of a shrouded flexible package;
FIG. 23 is a fragmentary eleva~ional view of an additional embodiment of a shrouded flexible package;
FIG. 24 is a cross-sectional view similar to that of FIG. 20 but showing an alternative shroud construction; and FIG. 25 is a fragmentary elevational view of a further embodiment of a shrouded flexible package.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the drawings and initially to FIGS. 1-8, a flexible package illustrating principles of the present invention is generally indicated at 10.
Flexible package 10 preferably comprises a plastic bag having front and back panels 12, 14 joined together at the left end by a side seal 20 and at th~~ right end by a side seal 22. Side seal 20 is preferably of conventional conduction heat-sealed construction, having a generally constant width throughout. Pane.l.s 12, 14 are further joined together at their bottom ends by a bottom seal 24 (see FIG. 10) extending between side seals 20, 22, as is known in the art. Alternatively, the bottom seal can be replaced by a fold line with panels 12, 14 being formed from a continuous sheet of plastic mater_al.
The upper end oi= flexible package 10 features a reclosable opening including a slide fastener arrangement with fastener traclc:~ 26, 28 and a slider 30, all preferably of polyolefin rnaterial. The :glider 30 is slidable along the f=astener tracks, caus;~ng the fastener tracks to interlock or mate (as shown in FIG. 2) for closure of the flexible package and to unmate or separate to open the flexible package for access t=o contents in the package interior. As will be seen herein, features associated with the fastener slider arrangement allow an unprecedented enlarged opening of the flexible package.
The enlarged package opening made possible by the present invention benefits manufacturers filling the package, as well as consumers dispensing product from the interior of the flexible package. In the preferred embodiment shown, the fastener tracks are also referred to as ~~zipper~~
tracks.
The flexible package according to principles of the present invention has found immediate commercial acceptance for use with food products, including perishable food products, such as cheese. Accordingly, it is generally preferred that the flexible package includes an hermetic seal 36 in the form of a peelable seal as taught in commonly assigned United States Patent Nos. 5,014,856; 5,1I~7,658; and 5,050,736, the disclosures of which are incorporated by reference a;~ if fully set forth herein.
As mentioned above, flexible package 10 preferably comprises a bag having panels 12,14 formed from plastic sheet material. The sheet material can be of a single material type, such as polyolef:in materials including polyethylf=_ne and polypropylene, but preferably comprises a laminate assembly of several different material types, as :is known in the art t~~ provide a _ 7 _ barrier to moisture as well as certain gases, such as oxygen or inert fillers of the types used with food products. Other types of laminate films, such as those known in the art to preserve food freshness, may be employed. Where the conta_nts of the fle:~cible package are not perishable or where other considerations may dictate, the panels 12, 14 can be constructed without regard to gas or vapor barrier properties. FIGS. ~ and 3 indicate that it is generally preferred that the :Fastener tracks be joined to web-like flanges which, in r_urn, are joined to panels 12, 14 as will be described be:Low with reference to FIG. 1c).
Referring now to FIGS. 5-8, fastener slider 30 has a top wall 44, a shorter side wall 46 and a longer side wall 48, cooperating to define an internal cavity 50 for receiving the fastener tracks 26, 28. As can be seen by comparing the end views of FIGS. 7 and 8, a first end 54 of the slider defines a cavity which is generally rectangular. The opposed end 56 (shown in FIG. 8) defines a cavity which is generally arrowhead or A-shaped, as indicated by reference numeral 50b, conforming to the outline of the interlocked fastener tracks shown in FIG. 2. When the slider 30 of FIG. 1 is moved to the right, end 56 is at the leading end of the slider and the fastener tracks 2E,, 28 are unlocked, thus opening the flexibla_ package 10. Conversely, as slider of FIG. 1 is mova_d to the left, end 54 (shown in FIG.
7) is made the lea.d:ing end, and fastener tracks 26, 28 are interlocked in. the manner indicated in FIG. 2, to 30 close the flexible package.
Referring again to FIGS. 2, 7 and 8, a number of features cooperate to maintain slider 30 captive on fastener tracks 26, 28. As can be seen for example in FIG. 8, a pair of upwardly facing stepped portions 62 are formed on either side of the slider cavity. Inwardly extending protrusions 64 are located at the other end of the slider. Protrusions 64 and stepped portions 62 engage the bottoms ''<?6a and 28a (see FIG. 2) of fastener tracks 26, 28, as can be seen for example in FIG. 10.
The engagement of the stepped portions 62 and the protrusions 64 with the bottoms of the fastener tracks prevents the slider from being upwardly dislocated from the fastener tracks.
Referring to FIGS. 1, 3 and 13, the ends of the of the fastener tracks are deformed or "c: rushed" to form stops 68. Preferably, stops 68 are formed by the application of ultrasonically generated heat and pressure to the ends of fastener tracks 26, 28. .Lt has been found that the use of present day conduction heat sealiIlg techniques does not provide the control needed to attain the intricate, close tolerance design of stop members according to principles o:~ the present invention.
Further, it has been found that the use of present day conduction heat sea:Ling techniques immed:Lately adjacent previously formed stop members tends to distort the stop members, oftentimes to an extent rendering the stop members unacceptable from a quality control standpoint.
As will be seen herein, stops 68 are configured for maximum efficiency, having the smallest front elevational surface area (i.e., the surface area visible in FIGS. 1 and 13, for example) which is adequate for containing slider 30 on the faatener tracks.
Referring to FIG. 3, the sides of the fastener tracks are softened and compressed at step faces or sides 72 so as to impart a pre-selected width ;~a and an upwelling displacement a above the upper surfaces 26b, 28b of fastener tracks 26, 28 (see FIG. 2). The material displaced above the upper surface of the fastener tracks interferes with the top wall 44 and ends of slider 30 to limit its sideways travel.
With reference to FIG. 3, the slider stop 68 (that is, the deformed portion of fastener tracks 26, 28) _ g _ is carefully configured so as to avoid deformation of the bottom surfaces 26a, 28a of the fastener tracks. With reference to FIG. 1, the lower ends of the fastener tracks extend undeformed, substantially to the side edges 16, 18 of the flexible package 10. FIG. 1 shows slider 30 "parked" at a fu:Lly opened position, with end 56 contacting the stop 68 located at the right hand end 22 of the flexible package. Stop members 68 and the undisturbed bottom surfaces 26a, 28a of the fastener tracks in the area of stop members 68 cooperate to captivate slider 30 on the fastener tracks, preventing its unintentional removal from flexible package 10.
It is preferred that the bottom edges 26a, 28a remain undeformed also for that portion extending beyond slider 30, and underneath at least: a porvion of the right hand stop 68. With reference to FIG. 3, a gap g is formed between the bottom edges of the fastener tracks and the top portion 81 of side seal 22. As can be clearly seen in FIG. 3, the stop 68, formed by ultrasonic techniques, is separated by a substantial distance from the side seal, which is typically formed using conduction heat seal techniques found to be incompatible with the precise, high resolution ultrasonic techniques used to form stop 68. A second stop 68 formed at the left hand end 16 of flexible package 19 is constructed in a similar fashion and extends beyond the end 54 of slider 30 when the slider is moved fully to the left, closing the upper end of the flexible package. As will be explained in greater detail herein, separation of the "crush"
operation performed on the fastener tracks to form stops 68 from the conduc:vtion heat sealing operation to form the enlarged side seals, allows stops 68 to take on a reduced size, effectively extending the size of the package opening, without sacrificing ability of the stops to effectively retair:~ slider 30 on the fastener tracks.

_ 10 -Referring to FIGS. 1 and 4, side seal 22 includes an upper enlarged or tapered portion 80 having a width substantially greater than the lower end of side seal 22, sufficient to underlie the substantial entirety of slider 30 when the slider is fully moved to the "parked" position as shown in FIG. 1. The width of the enlarged, tapered portion 80 ranges between 2000 and 4000 (or more for very n<~rrow side seals, e.g., 2 mm or less) of the width s of side seal 22 and most preferably ranges between 2500 and 3000 of the side seal width s.
The enlarged, tapered end 80 o.f side seal 22 has an S-shaped or double re-entrant bend contour 84 which partly defines the package interior. With reference to FIG. 11, the curved edge 84 of the enlarged side seal portion 80 provides a smooth transition at the corner of the package opening, preventing product entrapment within the flexible package. As those skilled in the art will appreciate, the smooth transition at the opening corner is especially beneficial for flexible packages, where shaking techniques otherwise suitable for rigid packages, are rendered largely ineffective by flexible panels 12, 14 and especially panels of very thin, unsupported material which are likely to collapse in use.
The smooth transition provided by curved edge 84 also deflects c>r guides product, 8G away from slider 30 as product is poured or otherwise removed from flexible package 10. This prevents contamination of mating surfaces of the slider and the fastener tracks, which would otherwise deteriorate the ability of slider 30 to move freely, performing interlocking and unlocking of the fastener tracks. As indicated in FIG. 12, in prior art arrangements product 86 is allowed to freely contact the bottom end of slider 30, a condition which is avoided by flexible packages according to principles of the present invention.

Preferably, fastener tracks 26, 28 are "crushed" to form stop member 68, using cJonventional ultrasonic heating equipma_nt which allows for a highly accurate shaping of the stop member as well as withdrawal of the deformation area away from the boi~tom surfaces 26a, 28a as shown, for example, in FIG. 3. As can be seen for example in FIG. 1, the width of stop member 68 is considerably less than the enlarged tapered portion 80 of side seal 22, and preferably is of a ;smaller width than that of the narrower major portion of side seal 22.
With reference to F:IG. 1, the width d of stop member 68 is less than the width s of side seal 22. Preferably, stop member width d ranges between 50o a~.zd 2000 of the width s of side sea:1 22. Preferably, the width w of the stop member 68 (i.e., the "crush" dimension) ranges between 25% and 80a of the width z of thf= fastener tracks, as illustrated in FIG. 3. The amount of upward displacement or upwa_lling a is approximately at least as great as the thickness of upper wall 44. It should be kept in mind that the total mass of the stop must be sufficient to hold the slider captive.
The stop member 68, in addition to having a reduced width d irz front elevational view and a small width w in end view (see FIG. 3), has a sufficiently smaller mass and i:rontal surface area than stops employed in the prior art. This construction allows the slider 30 to be moved to an extreme position immediately adjacent the edge 22 of flexible package 10, thus maximizing the package opening, allowing for easier removal of the package contents. This reduced size of stop 68 also contributes to the precision of the ultrasonic heating and formation of the stop member, needed to attain required precise dimensions. Further, from a manufacturing standpoint, the dwell time to melt and shape the stop 68 is substantially reduced, contributing to the overall eff:i.ciency for the package manufacturer.

In contrast to the present invention, prior art stop members have been formed by "crushing" the entire fastener profile, including the bottom surfaces 26a, 28a.
In addition, even if ultrasonic techniquE=s are employed for the stop member,, prior art side seal: (formed using conduction heat seal techniques and much larger, oftentimes three to four 'times larger than side seals according to the present invention) were typically overlaid with the stop, contributing to a substantial distortion of the stop structure. Even _if the prior art side seals were made to stop short of the fastener tracks, the relatively high level. of conduction heating in the immediate proximity of the stop have been found to cause a distortion of the stop, degrading control over its size and shape. These disadvantages are avoided with practice of the present invention, where the small, compact size of the stop is employed, and the gap g is formed between und.eformed fastener bottom surfaces 26a, 28a and the enlarger3 seal portion 80.
Turning now to FIGS. 4, 9 and 10, and initially to FIG. 9, the fastener tracks are preferably formed from a sub-assembly generally indicated at 70 in which the fastener tracks 26, 28 are provided with corresponding fastener flanges 72, 74. The fastener flanges 72, 74 are co-extensive with the fastener tracks 26, 28 and take the form of a plastic web to be heat sealed to the panels 12, 14. As can be seen in FIG. 9, fastener flange 74 is shorter in height than fastener flange 72, so as to accommodate the preferred hermetic seal arrangement shown in FIG. 10. The fastener flange; 72, 74 are heat sealed to panels 12, 14. With reference to FIGS. 4 and 10, fastener flange 7a: is welded or otherwise mechanically sealed to panel 12 at weld band '78. As shown at the upper portion of FIG. 10, the upper ends of panels 12, 14 are joined to the outer outwardly facing surfaces of fastener flanges 72, 74 at points intermediate the fastener tracks and peelable seal 36. Band 36 preferably comprises an hermetic peelable seal formed by the joinder of panel 14 to the inside face 72a of fastener flange 72 (see FIGS. 10 and 10a). Panel 12 is sea:Led to the opposite outside face of the fastener flange as schematically indicated i:n FIG. 10. In FIG. 10a the components of the pc=elable sea136 are shown, with film 12, which plays no part in the preferred peelable seal, being shown in phantom. Variations of the peelable seal are also contemplated by the present invention. For example, in FIG. 1.0b, the flanges 72, 74 of the fastener arrangement are joined with a peelable s~=_al. The upper ends of these flanges are heat sealed to panels 12, 14 as shown. In FIG. lOc a further alternativ~a is shown with the peelable seal 36 being formed at the joinder of lower portions of panels 12,14. the upper portions of panels 12, 14 are heat sealed to fastener. flanges 72, 74.
As will now be appreciated, tha enlarged, tapered end portions 80 of side seal 22 cooperate with other features of flexible package 1U to provide a number of important advarat~ages. More specifically, the enlarged tapered end portic.~ns 80 provide a smooth transition of the interior of fl.e:xible package 10 preventing product entrapment in the slider and fastener track surfaces when product is poured or otherwise dispensed. In addition, the enlarged tapered portion 80 helps to secure slider 30 about tracks 26, 28 by maintaining a clearance from bottom surfaces 2E~a, 28a of the fastener tracks.
Further, the enlarged tapered porr_ions 80 of side seals 22 strengthen and rigidify edge portions of panels 12, 14 in the immediate area of the parked position of slide 30.
Often, the greatest amount of force applied by the user to slider 30 occurs at the closing of the slider, when the fastener trar_ks are unlocked or separated from one another. When the slider 30 is in the middle of its travel along the fastener tracks, the user is provided with a sensation of the proper direction of slider movement. However, when the slider 30 is in the parked position, and especially in the "parked open"
position shown in F:LG. 1, the user's inil~ial application of force may be misdirected. The enlarged tapered portion 80 provides added stiffness and rigidity to the flexible package at the initial point where pressure is applied to the slider, thus further contributing to the assurance that secure engagement will be maintained between slider 30 and the tracks 26, 28.
With reference to FIG. 4, a consumer desiring to close the flexible package will grasp the enlarged side seal portion 80, pulling in the direction of arrow 81 while pulling or pushing slider 30 in the direction of arrow 31. The added stiffness and rigidity offered by enlarged side seal portion 80 is provided at a point of optimal effectiveness to react in an appropriate manner to forces applied to slider 30 and to ova=_rcome any resistance of the tracks 24, 26 to resume a mating, interlocked condition as the fastener tracks are interlocked. Those skilled in the art will appreciate that the "rolling resistance" or dynamic resistance to movement of slider 30 is oftentimes lower than the initial static resistance, opposing movement of the slider away from the fully opened parked position shown, for example, in FI:G. 4.
The added stiffness and rigidity imparted to the flexible package l0 and especially panels 12, 14 by enlarged side seal.:portion 80 results in other advantages when lightweight ~>anels 12, 14 are employed. For example, panels ofthe single polyolefin type where no laminate film (such as PET or NYLUN) is used to stiffen and support the support panel, have oftentimes excluded the use of sliding zippers, since minimum stiffness and rigidity needed tc> operate a fastener slider was not available. However, with enlarged side seal portions according to principles of the present invention, adequate stiffness :is provided, even for lightweight, so-called "single" films.
As indicated in FIG. 10, flanges 72, 74 are joined to respective panels 12, 1.4, preferably at their lower ends, so as to prevent product from entering between flange 72 and panel 12, as well as between flange 74 and panel 14. In certain applications this may not be a critical requirement. In FIG. 10, the upper portion of panel 12 is shown for illustrative purposes as spaced from the lower end of flange 72. In practice, it is generally preferred that this spacing be eliminated, with panel 12 being in intimate contact with :flange 72.
Similarly, any gap between panel 14 and she lower end of fastener flange 74 is preferably eliminated. Although it is most preferred that the peelable seal be formed by joining panel 14 to fastener flange 72, the peelable seal, preferably an hermetic seal., can be formed between the fastener flanges 72, 74 or directly between the panels 12, 14, although these alternative constructions are less preferred than the arrangement shown in FIG. 10.
Turning now to FIG. 13, flexible package 10 is shown constructed with the panels 12, 14, side seal 22, upper enlarged side seal portion 80 and fastener tracks 26, 28, as described above. The fastener tracks 26, 28 are preferably joined to flanges 72,74 (not visible in FIG. 13). FIG. 13 schematically illustrates commercial fabrication of flE:~xible packacJe 10. As will be appreciated by thane skilled in the art, practical commercial assembly requires recognition of tolerances of the equipment and materials used to construct a viable commercial product.. For example, tracks 26, 28 are ultimately mechanically coupled to panels 12, 14 using conduction heat seal tooling. A gap 110 shown in FIG. 13 represents the tolerance range or_ margin of error for tool alignment used to secure the fastener tracks 26, 28.

As mentioned, it is preferred that the upper end of enlarged side seal portion 80 be spaced below the lower ends of the fastener traclts, such as the lower end 26a of fastener track 26 visible in FIG. 13. Further, it is preferred that the ~)ap g continue beyond the end 56 of slider 30.
A gap 116 represents a tolerance range or margin of error for the desired positioning of the upper end of enlarged side seal portion 80, to provide clearance for the bottom edge of slider :~0. As illustrated in FIG. 13, the upper end of enlarged side seal portion 80 falls at an outermost limit of its tolerance range. Preferably, the upper end of enlarged side seal portion 8c) is within the gap 116, rather than to one end thereof. The gap 116 also accounts for any cant or angular mis-positioning or mis-a:Lignment where the upper end of side seal 80 may be ang:Led slightly from a position parallel to the fastener tracks, as may be encountered in a practical commercial environment.
A band 120 shown in FIG. 13 represents a conduction heat seal of the fastener_ flange to the panels 12 or 14. This conduction heat seal 120 provides the principal mechanical attachment of the fastener track assembly to the package panels. Band 36 is the peelable seal, preferably an hermetic seal_, between panel 14 and fastener flange 72. A gap 124 represents the desired production spacing between production seal 120 and peelable seal 36. The remaining band 128 represents the production tolerance range or margin of error for positioning of peelable seal 36 with respect to the package panels.
In one commercial embodiment, flexible package 10 comprises a plastic bag having a width of approxi-mately 6.5 inches from side edge to side edge and a total overall height of approximately 10.75 inches. The fastener tracks 26,28 have a height of approximately 4 millimeters, with gaps 110, 116 each having a height of 2 millimeters. As shown in the upper righv hand corner of FIG. 13, stop 68 projects a distance a above the top edge of the fastener tracks. In FIG. 13, only the top edge 26b is visible. VJi.r_h reference to FIG. 10, the upper ends of panels 12, 14 are preferably spaced a distance p from the bottom edges of the fastener tracks, ranging between 2 and 3 millimeters. The conduc~.ion heat seal 120 and the peelafrle seal 36 each have a height of 6 millimeters, and gap 124 located between the two, has a height of 2 millimeters. The desired spacing between conduction heat sea:1 120 and peelable seal 36 has a maximum value of 2 millimeters and a minimum value required to prevent overlap of the conduction heat seal and peelable seal. The side seal_ 22 has a width ranging between 3 and 8 millimeters and the stop 68 has a width (see reference character d in FIG. 1) ranging between 2.0 and 8.0 mm. As ca.n be seen with reference to FIG. 13, the upper end of side seal 22 is spaced a substantial distance below the 'upper edge of the flexible package.
This spacing ranges between a minimum value equal to the combined height ofthe fastener tracks and gap 110, and a maximum value equal to the combined height of the fastener tracks, gap 110 and gap 116.
Referring to FIG. 14, several alternative features are shown with reference to a flexible package 130. The right hand portion of flexible package 130 is identical to flexible package 10, described above, except for the addition c.>f a peg hole 132 formed in the enlarged side seal portion 80. Flexible package 130 has a left side seal 20 as described above with respect to FIG. 1.
However, in the flexible package 130, the upper end of side seal 20 is enlarged at 138 in a manner similar to that of enlarged ~;i.de seal portion 80. An optional peg hole 140 is formed in the enlarged side seal portion 138.
Although the peg roles 132, 140 are shown having a - 1$ -circular shape, virtually any shape (e.g., oval) can be used, as well. Peg holes 132, 140 can be formed by punching before or after the side seals are fully formed, it being preferred tThat the upper ends of the side seals provide a complete sealing of the panels and other components of the f~_exible package. It will be appreciated by those skilled in the art that the holes add heat relief to the enlarged side seal_ portion. This helps preserve the uniformity of the tapered area and of the dimensioning of gap g, as well as the uniformity of shrinkage which helps control manufacture on a production basis. If desired, the heat sealing die can be made hollow in the region of the peg holes, even in the absence of peg hole features to attain further heat relief advantages. It may also be preferable in some instances to form the peg holes 132, 140 as part of the formation of the side seals using, in effect, a thermal cutting or thermal punching technique. With the inclusion of two pe<~ holes 132, 140, flexible package 130 can provide an improved presentation of <~rt work or other indicia carried on the panels of the flexible package.
It is generally preferred that textual and graphic information be oriented generally perpendicular to the side edges o:~ the flexible package. If only one peg hole is provided, the package will tend to hang rotated in a vertical plane, according to the distribution of product within the flexible package.
With support given. to two peg holes 132, 140, the flexible package is oriented in an upright position, making it easier t:o read the text and graphical information carried on the package. If desired, the text and graphical information printed on the rear panel can be inverted so that a consumer can "flip" the package to inspect the rear panel, without having to remove the package from the support pegs passing through peg holds 132, 140.

Although. the package opening, fastener tracks and related feature: are shown at the upper end of the flexible package, the present invention :is intended to cover arrangements :in which the opening and related structure is provided on the side or bottom of the flexible package.
Referring now to FIGS. 15-25 and initially to FIG. 25, an improved package according to principles of the present invention, is shown. Package 200 includes the features of flexible package 10, described above and in addition includes a shroud portion 204 extending above line of weakness 208 formed in panels 12, 14. Line of weakness 208 can be formed using availab:Le conventional techniques, and is preferably formed using laser cutting techniques. Preferably, line of weakness 208 extends across the width of flexible package 200, from one side edge to the other. As shown in fIG. 25, line of weakness 208 extends to edge 18, located at side seal 22.
Preferably, shroud 204 i.s made for easy tear-away removal in an. intuitive manual operation not requiring special directions. Preferably, a notch 210 is f formed in edge 18, and is located slightly above stop 68.
An angled or diagonal line of weakness 212 extends from notch 210 to an opening 214 which surrounds slider 30.
Preferably, slider 30 is located at a fully closed position along the fastener tracks and is surrounded by opening 214 at the closed position. In order to gain access to the package contents, a user grasps the upper edge of shroud 204 causing an initially tearing at notch 210. Tearing continues along diagonal line 212 and enters opening 214, continuing a7.orng opeciing 214 to line 208. With continued tearing across the width of package 200, the shroud 204 is removed, leaving a package substantially similar to the packages described above in FIGS. 1-14.

Referring again to FIG. 25, shy°oud 204 includes an upper fin seal 220 and a side fin seal portion 222.
Preferably, the upper fin seal 220 inside fin seal 222 are formed in separ~ite sealing operation: and are made to slightly overlap one another for package integrity and sealing of the package interior. The bottom of side fin seal 222 is terminated at or slightly above end stop 68.
It is most preferred that side fin seal 222 be terminated slightly above end stop 68 to avoid interfering with the controlled formation of the end stop which, as pointed out above, has a shape and position provrtAding novel advantages. Notch a?10 in the preferred embodiment shown in FIG. 25 is formed at the lower end of side fin seal 222. If desired, notch 210 could be formed in a gap between end stop 68 and a side fin seal shortened with respect to the side fin seal illustrated in FIG. 25.
Turning now to FIGS. 15-18 a flexible package 230 is shown. Package 23() is substantially identical to package 200 described above, except that opening 214 does not directly communucate with diagonal line 212. Tearing of package 230 to rf:move shroud 204 is initiated at notch 210 and continues along diagonal line 21:? to a point of intersection with line of weakness 208. If desired, the portion of weakness line 208 designated by reference numeral 232, line between diagonal line :?12 and edge 18 can be omitted, if desired. Further, weakening line 208 and diagonal line 212 can be formed in a single operation using conventional t=echniques such as laser cutting. As a further alternative, diagonal line 212 can be made to curve either along its entire length, or at the point of intersection with weakening line 208. F=LG. 15 shows a central peg hole 234 is formed in upper yin seal 220.
Referring now to FIG. 19, flexible package 240 is substantially identical to flexible package 230, except for the omission of opening 214. Arrangement of FIG. 19 is preferably employed where the width of slider 30 is reduced, or the shroud 204 is sufficiently flexible or has an enlarged cross section so as to completely enclose slider 30 without requiring an opening to relax tension in the material forming the shroud.
Referring now to FIG. 20, a cross section of flexible package 200 is shown. Preferably, shroud 204 is formed as a continuous integral extension of panels 12, 14, the upper free edges of which are joined together to form upper fin seal 220.
Referring to FIc~. 21, exemplar~r tooling to form the package 200 are shown. For example, a pair of upper seal bars 250 form upper :Eire seal 220 while a pair of intermediate seal bars 252 join panels 12, 14 to fastener flanges 72, 74. Lower seal bars 254 form the peel seal 36 and weld band 78 (FIG. 20). The bottom of package 200, as is preferred with the other flexible packages shown herein, is formed by a dead fold 2!~8.
Referring now to FTG. 22, a flexible package 260 is substantially identical to flexib:Le package 230 of FIG. 18, except for a curved line of weakness 264 joining notch 210 with weakening line 208.
FIG. 23 shows a flexible package 270 similar to that of flexible package 230, except than a large or tapered side seals are provided at each side of the package. Peg holes 132, 140 are formed in the tapered side seal portions and if desired an optionally central peg hole 234 can be formed in upper fin peal portion 220.
As with the other embodiments shown herein, it is generally preferred that the enlarged or tapered side seal portions stop short of the line of weakness 208.
FIG. 24 is a cross-sectional view of an optional flexible package 280 substantially identical to flexible package 200, described above, except that a shroud member 282 is separately formed from panels 12, 14 and is joined to t:he upper ends of the panels by conventional welding or other joining techniques. Most preferably, shroud 282 is joined to the upper ends of panels 12, 14 at the point. of sealing with flanges '72, 74. The weakening line for removal of shroud of 282 can be formed either above or below the point. of sealing with remainder of the flexible package.
The drawings and the foregoing descriptions are not intended to represent the only forms of the invention in regard to the details of its construction and manner of operation. Changes in form and in the proportion of parts, as well as the substitution of equivalents, are contemplated as circumstances may suggests or render expedient; and although specific terms have been employed, they are .intended in a generic and descriptive sense only and not for the purposes of limitation, the scope of the invention being delineated by the following claims.

Claims (27)

1. A reclosable flexible package comprising:
opposed front and rear panels having sides and joined together to form an interior and a package opening communicating with said interior;
first and second interlockable fastener tracks configurable in an interlocked, closed position and an unlocked open position;
a slider movable along said fastener tracks to configure said tracks in said interlocked position so as to close said opening and to configure said fastener tracks in said unlocked position so as to allow access through said opening to said package interior;
said fastener tracks having opposed ends located adjacent said opposed sides of said front and said rear panels;
stops adjacent said ends of said fastener tracks to interfere with and prevent travel of said slider beyond said fastener tracks;
a side seal of pre-selected width joining together one side of said front and said rear panels;
a shroud covering said slider and at least the major portion of said fastener tracks; and weakening portions extending adjacent said fastener tracks for severing of said shroud in preparation for removal of said shroud from the remainder of said reclosable flexible package.
2. The reclosable flexible package of claim 1 wherein said shroud covers the substantial entirety of said fastener tracks and said slider.
3. The reclosable flexible package of claim 2 wherein said shroud defines openings for said slider.
4. The reclosable flexible package of claim 1 wherein said weakening portion includes a line of weakness extending along at least the portion of said fastener tracks.
5. The reclosable flexible package of claim 4 wherein said line of weakness extends along the substantial entirety of said fastener tracks.
6. The reclosable flexible package of claim 4 wherein said line of weakness extends across substantially the entire extent of said reclosable flexible package.
7. The reclosable flexible package of claim 1 wherein said weakening portion includes a notch formed in one side of said reclosable flexible package to initiate tearing of said reclosable flexible package.
8. The reclosable flexible package of claim 7 further comprising a line of weakness extending along said fastener tracks, cooperating with said notch to tear said reclosable flexible package, allowing said shroud to be removed from the remainder of said reclosable flexible package.
9. The reclosable flexible package of claim 8 further comprising an angled weakening line between said notch and said line of weakness.
10. The reclosable flexible package of claim 9 wherein the said angled severing line crosses said fastener tracks.
11. The reclosable flexible package of claim wherein the said line is a generally straight line.
12. The reclosable flexible package of claim wherein said angled line includes a curved line portion.
13. The reclosable flexible package of claim 1 wherein said shroud defines an opening through which said slider protrudes, said opening connecting said angled severing line and said line of weakness.
14. The reclosable flexible package of claim 1 wherein said shroud includes an upper portion comprising a fin seal.
15. The reclosable flexible package of claim 14 wherein said shroud further includes a side fin seal above said fastener tracks, in line with the side seal trunning said front and said rear panels.
16. The reclosable flexible package of claim 1 wherein said shroud is integrally formed with said front and said rear panels, comprising monolithic portions of said front and said rear panels.
17. The reclosable flexible package of claim 1 wherein said shroud includes shroud panels separately formed and joined to said front and said rear panels.
18. The reclosable flexible package of claim 1 wherein said side seal having an enlarged end portion of enlarged width adjacent said fastener tracks, with at least a part of said enlarged end portion disposed below said fastener tracks; and wherein said enlarged end portion is disposed beneath the substantial entirety of said slider and shields said slider, deflecting product being discharged from said package interior, around said slider.
19. The reclosable flexible package of claim 2 further comprising a peelable seal preventing communication of said opening with said package interior.
20. The reclosable flexible package of claim 1 wherein said peelable seal comprises an hermetic seal.
21. The reclosable flexible package of claim 1 wherein said stops comprise deformed end portions of said fastener track.
22. The reclosable flexible package of claim 21 wherein said fastener track end portions are softened with application of ultrasonically generated heat and deformed under pressure.
23. The reclosable flexible package of claim 22 wherein the bottoms of said fastener cracks are preserved undeformed.
24. The reclosable flexible package of claim 1 further comprising flanges extending from said fastener tracks and joined to said front and said rear panels.
25. The reclosable flexible package of claim 24 further comprising a sealing band between said fastener tracks and said peelable seal joining said flanges to said front and said rear panels.
26. The reclosable flexible package of claim 1 wherein said fastener tracks have a bottom portion engaging said slider 27a so as to prevent disengagement of said slider from said fastener tracks.
27. The reclosable flexible package of claim 1 wherein both of said side seals have a pre-selected width and an enlarged end portion of enlarged width adjacent said fastener tracks, with at least a part of said enlarged end portion disposed below and spaced from said fastener tracks.
CA2381874A 2001-04-18 2002-04-17 Fastener closure arrangement for flexible packages Expired - Fee Related CA2381874C (en)

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US09/837,694 US6616333B2 (en) 2000-09-22 2001-04-18 Fastener closure arrangement for flexible packages

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US6974256B2 (en) 2005-12-13
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CA2381874A1 (en) 2002-10-18
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EP1251075B1 (en) 2006-06-21
US20020154836A1 (en) 2002-10-24

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