US3279511A - Flexible packaging system - Google Patents

Flexible packaging system Download PDF

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Publication number
US3279511A
US3279511A US219833A US21983362A US3279511A US 3279511 A US3279511 A US 3279511A US 219833 A US219833 A US 219833A US 21983362 A US21983362 A US 21983362A US 3279511 A US3279511 A US 3279511A
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Prior art keywords
bag
hot water
water soluble
panels
laundry
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US219833A
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Jr Roger C Griffin
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Reynolds Metals Co
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Reynolds Metals Co
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Publication date
Priority to BE636692D priority Critical patent/BE636692A/xx
Priority to NL297149D priority patent/NL297149A/xx
Application filed by Reynolds Metals Co filed Critical Reynolds Metals Co
Priority to US219833A priority patent/US3279511A/en
Priority to GB30806/63A priority patent/GB1047034A/en
Priority to FR944901A priority patent/FR1367875A/en
Priority to CH1054063A priority patent/CH423695A/en
Priority to DE19631485094 priority patent/DE1485094A1/en
Application granted granted Critical
Publication of US3279511A publication Critical patent/US3279511A/en
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    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F95/00Laundry systems or arrangements of apparatus or machines; Mobile laundries 
    • D06F95/002Baskets or bags specially adapted for holding or transporting laundry; Supports therefor
    • D06F95/004Bags; Supports therefor
    • D06F95/006Bags for holding the laundry during washing
    • AHUMAN NECESSITIES
    • A45HAND OR TRAVELLING ARTICLES
    • A45CPURSES; LUGGAGE; HAND CARRIED BAGS
    • A45C11/00Receptacles for purposes not provided for in groups A45C1/00-A45C9/00
    • A45C11/24Etuis for purposes not covered by a single one of groups A45C11/02 - A45C11/22, A45C11/26, A45C11/32 - A45C11/38
    • 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
    • B65D31/00Bags or like containers made of paper and having structural provision for thickness of contents
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F95/00Laundry systems or arrangements of apparatus or machines; Mobile laundries 
    • D06F95/002Baskets or bags specially adapted for holding or transporting laundry; Supports therefor
    • D06F95/004Bags; Supports therefor
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2202/00Aspects relating to methods or apparatus for disinfecting or sterilising materials or objects
    • A61L2202/20Targets to be treated
    • A61L2202/26Textiles, e.g. towels, beds, cloths
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S128/00Surgery
    • Y10S128/24Medical-surgical bags
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S220/00Receptacles
    • Y10S220/30Biodegradable

Definitions

  • This invention relates to novel water soluble flexible packaging material. More particularly, the invention concerns a water soluble plastic film laundry bag for use in hospitals and similar institutions in which the control of infection is important, and the method of making and using the same.
  • Such bags are effective in controlling bacteria spread in hospital wards and laundry chutes, but their protection is lost when the laundry is dumped out of the bags prior to placing the laundry in the baskets of the washing machines. Furthermore, disposal of the bacteria-laden bag itself becomes a major problem. If the polyethylene bags are placed in an incinerator, they tend to melt and clog the burning mass against the passage of air. If combustion is inefficient, many of the organisms can escape into the atmosphere, or remain in the ashes which in turn require special disposal.
  • Hospital laundry includes wet as well as dry soiled linens, and any plastic film laundry bag designed for general hospital use would have to be resistant to the action of wet linens at body temperature or colder.
  • Cold water soluble plastic film commonly used for packaging purposes would be suitable only for containing dry or almost dry linens, since it would fall apart or develop holes when in contact with normal hospital wet linens, prematurely releasing the contents.
  • Hot water soluble plastic film would be more suitable to hold damp or wet linens, but hospital laundry practice employs initial rinsing steps which are carried out with water at body temperature or colder in order to loosen and fiush away stains from blood and body discharges. The laundry must be fully wet by these initial flushing rinses if it is to be washed clean in subsequent hot water sudsing cycles and rinses which are customarily run at temperatures in excess of about 145 F.
  • a laundry bag which will hold wet linens at body temperature or colder, yet permit these linens to be contacted almost immediately by the cold flush when the bag and its contents are placed in the washing machine.
  • the contents are exposed to the action of the blood and stain removing cold water flushes in the machine; and when the hot water containing various soaps, detergents, bleaches, and the like are introduced into the washing cycle, the laundry bag in its entirety is dissolved and flushed away into the sewage disposal system.
  • FIGURE 1 is a perspective view of a laundry bag constructed in accordance with the invention
  • FIGURE 2 is a similar view of another embodiment
  • FIGURE 3 is a perspective view of a third embodiment
  • FIGURE 4 is a side view showing a filled and closed bag
  • FIGURE 5 is a sectional view taken on the line 5-5 of FIGURE 4;
  • FIGURE 6 is an enlarged view of the seam construction shown in FIGURE 5
  • FIGURE 7 is a section taken on the line 7-7 of FIG- URE 1, showing a detail of the side seam;
  • FIGURE 8 is a'sectional view illustrating a method of assembly of the bag panels
  • FIGURE 9 is a graph illustrating releasing characteristics of the bag of the invention at temperatures up to F.
  • the container 1 is formed from a pair of superimposed hot water soluble flexible plastic sheets 2 of generally rectangular configuration.
  • a thin layer of cold water sensitive flexible plastic material 3 is interposed between the panels adjacent the exterior longitudinal edge 4, the panels and the interposed plastic layer being bonded to form seam portion 5.
  • the seam structure is shown in more detail in FIGURE 7, which illustrates the junction of panels 2 and interposed cold water soluble layer 3.
  • the sheets are bonded along their lower edges to form a bottom seam, and the upper margins 6 of the panels are separable to provide an opening for filling the container.
  • the bag in FIGURE 1 is depicted as rectangular in shape, it will be understood that it may be made in any desired shape. It will be appreciated, furthermore, that a generally tubular body may be provided with such a seam; that the seam may be transverse as well as longitudinal; and that the seam need not extend completely to the bottom edge of the bag.
  • the bag is formed by bending a single continuous piece 7 of hot water soluble film back upon itself so that the bottom 8 of the container is integral therewith, but not necessarily folding or creasing the bottom portion 8.
  • the superimposed panel portions of the plastic film are formed into side. seams having interposed strips of cold water sensitive plastic material 9 running adjacent to the longi- 'tudinal edges.
  • FIGURE 3 there is illustrated still another embodiment in which a bag body portion 10 made of hot water soluble plastic film material is provided with an access opening 11, and with a releasable panel 12.
  • panel 12 is hot water soluble film bonded to the body portion 10 with cold water sensitive material 13 interposed in the manner of the side seams shown in FIGS. 1 and 2.
  • FIGURE 4 there is shown a side view of a laundry bag filled with material to be washed so as to distend the walls 14 of the bag.
  • This figure illustrates the preferred means for closure of the open top of the bag which is the use of a tie tape around the gathered throat of the bag, the tape being made of cold water soluble plastic material.
  • FIGURE 5 shows an enlarged crosssection of the distended bag of FIGURE 4 along the line 5'5, depicting the side seams 15 and the interposed cold water sensitive plastic layer 16.
  • FIGURE 6 shows the side seam 15 in greater detail, depicting the front bag panel 17 and rear panel 18, the interposed water soluble plastic layer 16, contained laundry 20, and a space 21 lying between the wet laundry and the bag walls.
  • a sheet of a hot watersoluble plastic film may be coated over selected areas with a layer of a cold water sensitive plastic material, and a second sheet of hot water soluble plastic film may be superimposed thereon and the edge portions heat sealed to form side seams.
  • a strip of a cold water sensitive, plastic material may be inserted between two hot water soluble plastic sheets adjacent the opposing edges thereof to define a side seam, or several side seams, and the junction'bonded by heat sealing.
  • the strip and the panel edge portions may be bonded together by a suitable adhesive.
  • the bag may be formed with or without releasable seams, employing a composite flexible plastic sheet for the body portion.
  • a composite flexible plastic sheet for the body portion.
  • Such a sheet may comprise a relatively thick exterior layer of the cold water sensitive material backed with a protective layer of the hot water soluble flexible plastic material. The latter material isolates the exterior layer from the wet linens, but is sufficiently thin to be ruptured in the washing machine once the exterior layer becomes softened.
  • FIGURE 8 there is illustrated still another method wherein opposing body panels 23 of hot water soluble plastic sheet material, having attached at one edge thereof a strip 24 of cold water sensitive plastic material, are brought into juxtaposition so that the respective strips are positioned, one at each set of panel edges, and the panels are bonded by heat sealing or adhesive application.
  • the containers of the invention have been tested in hospital applications and have been found to possess numerous advantages not previously obtainable using known types of containers. Among these advantages are a significant reduction'in the incidence of airborne bacteria and other organisms.
  • the filled bags can be dropped through multistoried laundry chutes without damage or loss of contents.
  • the invention permits the use of a single type of bag for dry, damp, wet or soiled hospital linens, and reduces labor costs in the laundry by eliminating the unpacking steps previously required, and by speeding loading time of the washing machines. At the same time the new bags do not interfere with the use of the cold flush in the washing machines to eliminate setting of blood stains and the like, in accordance with standard hospital procedure.
  • the laundry bags of the invention may readily be filled by suspending them from a ring stand or even over the back of a chair. Wet or dry hospital linens may be inserted up to the normal capacity of the bag. The bag is then closed 'by gathering the throat and tying it with a cold water soluble plastic tape, as shown in FIGURE 4. The bag is transported to the laundry room on a cart or via a laundry chute. In the laundry room the filled bag is thrown directly into the washing machine without being opened or loosened. In the wash wheel of the machine, the first flush of Water at body temperature or colder is introduced to avoid the setting of stains from blood and other body discharges. This first flush actsupon the cold water soluble tape at the throat of the bag and upon the seam tapes or layers of cold water sensitive plastic.
  • the weakened tape and side seams rupture under the impact of the wash load and the front and rear panels fall apart, allowing the soiled linen contents to spill out into the water.
  • the hot water sudsing and rinsing cycles are performed, during which the entire laundry bag dissolves, including both the hot Water soluble panel ,sheets and the cold water soluble tapes, and is removed in the discharge from the washing machine.
  • the water sensitive flexible .plastic material employed for the fabrication of containers in accordance with the presently preferred practice of the invention is polyvinyl alcohol sheet or film, of varying thickness, and of varying types, depending upon the water sensitivity or solubility characteristics desired.
  • hot water solubility For the container panels, there are two film characteristics of importance: (a) hot water solubility, and (b) damp stability.
  • the criterion of hot water solubility which has proven desirable is that the panel must dissolve completely in 170 F. Water within a period of 5 minutes, with agitation. At the same time, the .panel material must be substantially insoluble in supply water. Accordingly, the expression hot water soluble is used herein to designate materials which are soluble in water at higher temperature but are substantially insoluble in water at about 10 F. or lower.
  • Damp stability is defined as the ability of the film to maintain its integrity as a film while in contact with damp linens.
  • the hot water soluble ,panel material from polyvinyl alcohol formulations which has a relatively low glycerol content in order to reduce sensitivity to moisture.
  • glycerol glycerol
  • the bag panel material polyvinyl alcohol film material hav ing the general range of hot water solubility desired, but with their damp stability controlled by the glycerol content.
  • Such hot water soluble, cold water insoluble polyvinyl alcohol films are well known and are described, for
  • the polyvinyl alcohol film to be used for the hot water. soluble panels preferably has the following characteristics:
  • Thickness 0.5-10 mils.
  • a suitable film formulation for container panels made of hot water soluble polyvinyl alcohol is as follows:
  • the cold water sensitive polyvinyl alcohol which is used for tying tape and for side seam scaling in accordance with the invention is one which tends to soften in cold Water, although not necessarily to dissolve completely.
  • cold water is meant water at a temperature .up to about 100 F.
  • a suitable cold water sensitive tape or layer is one which will release thecontents of the bag in cold water in less than 2 minutes, preferably less than 1 minute. This characteristic is illustrated in the graph of FIGURE 9, which shows the release time, with mild agitation, relative to water temperature, employing a suitable cold water sensitive tape (Reynolon PVA/WS-13) in the bag seams.
  • Cold water sensitive or soluble polyvinyl alcohol has longbeen known and is disclosed, for example, in Patent 2,502,715 (Example 6) and 2,750,027 (col. 2, lines 55-60).
  • Thickness About 0.015 in. Average yield 21,600 sq. in./lb./mil. Specific gravity 1.21-1.31.
  • a water soluble flexible container adapted to release its contents when immersed in water having a temperature up to about 100 F and which is substantially completely soluble in hot water, comprising superimposed panels of hot water soluble flexible plastic material defining a body portion to receive such contents, the top margins of said panels being separable to provide an opening for filling the container, and a thin flat narrow layer of cold water sensitive plastic material bonded between the panels along substantially coterminous edges thereof to form a releasable seam in said body portion.
  • a water soluble plastic fllm laundry bag which is adapted to hold wet linens at body temperature or colder and which is adapted to release its contents when immersed in water having a temperature up to about 100 F., and thereafter to dissolve completely in hot water,
  • a water soluble plastic film laundry bag which is adapted to hold wet linens at body temperature or colder and which is adapted to release its contents substantially immediately when immersed in water having a temperature up to about F., and thereafter to dissolve completely in hot water, comprising sheets of hot water soluble polyvinyl alcohol film having good damp stability superimposed with their longitudinal edges substantially coterminous, the top margins of said sheets being separable to provide an opening for filling the bag, a thin flat narrow layer of cold water soluble plastic material interposed between the sheets along said longitudinal edges, said sheets and interposed plastic layer being bonded to form a pair of releasable edge seams.

Description

1966 R. c. GRIFFIN, JR
FLEXIBLE PACKAGING SYSTEM 2 Sheets-Sheet 1 Filed Aug. 28, 1962 INVENTOR ROGER C. GRIFFIN J'FZ.
1966 R. c. GRIFFIN, JR
FLEXIBLE PACKAGING SYSTEM 2 Sheets-Sheet 2 Filed Aug. 28, 1962 III/[I10 IIIIII IIIIIIIIIIIIII.
0 O O B 6 4 mo mEmL Gmk INVENTOR ROGER C. GQIFFINJR.
TIME IN SECONDS United States Patent 3,279,511 FLEXIBLE PACKAGING SYSTEM Roger C. Griflin, Jr., Henrico County, Va., assignor to Reynolds Metals Company, Richmond, Va., a corporation of Delaware Filed Aug. 28, 1962, Ser. No. 219,833 3 Claims. (Cl. 150-1) This invention relates to novel water soluble flexible packaging material. More particularly, the invention concerns a water soluble plastic film laundry bag for use in hospitals and similar institutions in which the control of infection is important, and the method of making and using the same.
It is known that soiled hospital bed linens, garments, towels, diapers, and the like, are contaminated with pathogenic organisms. In accordance with prevailing practice, soiled laundry is placed in cloth bags, which are porous and permit bacteria to escape through the bag walls. During the handling of these bags via laundry chutes and other means of transportation, pathogenic bacteria are disseminated by currents of moving air, finding their way into clean linens, food utensils, personnel uniforms, buildings and equipment, giving rise to serious problems of infection control. It has been proposed to reduce the spread of bacteria by employing bags made of impervious plastic films such as polyethylene. Such bags are effective in controlling bacteria spread in hospital wards and laundry chutes, but their protection is lost when the laundry is dumped out of the bags prior to placing the laundry in the baskets of the washing machines. Furthermore, disposal of the bacteria-laden bag itself becomes a major problem. If the polyethylene bags are placed in an incinerator, they tend to melt and clog the burning mass against the passage of air. If combustion is inefficient, many of the organisms can escape into the atmosphere, or remain in the ashes which in turn require special disposal.
Hospital laundry includes wet as well as dry soiled linens, and any plastic film laundry bag designed for general hospital use would have to be resistant to the action of wet linens at body temperature or colder. Cold water soluble plastic film commonly used for packaging purposes would be suitable only for containing dry or almost dry linens, since it would fall apart or develop holes when in contact with normal hospital wet linens, prematurely releasing the contents.
Hot water soluble plastic film would be more suitable to hold damp or wet linens, but hospital laundry practice employs initial rinsing steps which are carried out with water at body temperature or colder in order to loosen and fiush away stains from blood and body discharges. The laundry must be fully wet by these initial flushing rinses if it is to be washed clean in subsequent hot water sudsing cycles and rinses which are customarily run at temperatures in excess of about 145 F.
In accordance with the invention, a laundry bag is provided which will hold wet linens at body temperature or colder, yet permit these linens to be contacted almost immediately by the cold flush when the bag and its contents are placed in the washing machine. Thus, the contents are exposed to the action of the blood and stain removing cold water flushes in the machine; and when the hot water containing various soaps, detergents, bleaches, and the like are introduced into the washing cycle, the laundry bag in its entirety is dissolved and flushed away into the sewage disposal system.
These and other objects, advantages and details will become apparent as the description proceeds, and from the accompanying drawings, in which FIGURE 1 is a perspective view of a laundry bag constructed in accordance with the invention;
FIGURE 2 is a similar view of another embodiment; FIGURE 3 is a perspective view of a third embodiment;
FIGURE 4 is a side view showing a filled and closed bag;
FIGURE 5 is a sectional view taken on the line 5-5 of FIGURE 4;
FIGURE 6 is an enlarged view of the seam construction shown in FIGURE 5 FIGURE 7 is a section taken on the line 7-7 of FIG- URE 1, showing a detail of the side seam;
FIGURE 8 is a'sectional view illustrating a method of assembly of the bag panels;
FIGURE 9 is a graph illustrating releasing characteristics of the bag of the invention at temperatures up to F.
The container 1 is formed from a pair of superimposed hot water soluble flexible plastic sheets 2 of generally rectangular configuration. A thin layer of cold water sensitive flexible plastic material 3 is interposed between the panels adjacent the exterior longitudinal edge 4, the panels and the interposed plastic layer being bonded to form seam portion 5. The seam structure is shown in more detail in FIGURE 7, which illustrates the junction of panels 2 and interposed cold water soluble layer 3. The sheets are bonded along their lower edges to form a bottom seam, and the upper margins 6 of the panels are separable to provide an opening for filling the container. While the bag in FIGURE 1 is depicted as rectangular in shape, it will be understood that it may be made in any desired shape. It will be appreciated, furthermore, that a generally tubular body may be provided with such a seam; that the seam may be transverse as well as longitudinal; and that the seam need not extend completely to the bottom edge of the bag.
In the embodiment shown in FIGURE 2, the bag is formed by bending a single continuous piece 7 of hot water soluble film back upon itself so that the bottom 8 of the container is integral therewith, but not necessarily folding or creasing the bottom portion 8. The superimposed panel portions of the plastic film are formed into side. seams having interposed strips of cold water sensitive plastic material 9 running adjacent to the longi- 'tudinal edges. In FIGURE 3 there is illustrated still another embodiment in which a bag body portion 10 made of hot water soluble plastic film material is provided with an access opening 11, and with a releasable panel 12. In the construction shown, panel 12 is hot water soluble film bonded to the body portion 10 with cold water sensitive material 13 interposed in the manner of the side seams shown in FIGS. 1 and 2.
In FIGURE 4 there is shown a side view of a laundry bag filled with material to be washed so as to distend the walls 14 of the bag. This figure illustrates the preferred means for closure of the open top of the bag which is the use of a tie tape around the gathered throat of the bag, the tape being made of cold water soluble plastic material. FIGURE 5 shows an enlarged crosssection of the distended bag of FIGURE 4 along the line 5'5, depicting the side seams 15 and the interposed cold water sensitive plastic layer 16. FIGURE 6 shows the side seam 15 in greater detail, depicting the front bag panel 17 and rear panel 18, the interposed water soluble plastic layer 16, contained laundry 20, and a space 21 lying between the wet laundry and the bag walls.
The method of manufacture of the containers of the invention may be performed in several ways. Thus, to make the embodiment shown in FIGURE 1, a sheet of a hot watersoluble plastic film may be coated over selected areas with a layer of a cold water sensitive plastic material, and a second sheet of hot water soluble plastic film may be superimposed thereon and the edge portions heat sealed to form side seams.
In accordance with a variation of the foregoing method, a strip of a cold water sensitive, plastic material may be inserted between two hot water soluble plastic sheets adjacent the opposing edges thereof to define a side seam, or several side seams, and the junction'bonded by heat sealing. Or, the strip and the panel edge portions may be bonded together by a suitable adhesive.
Alternatively, the bag may be formed with or without releasable seams, employing a composite flexible plastic sheet for the body portion. Such a sheet may comprise a relatively thick exterior layer of the cold water sensitive material backed with a protective layer of the hot water soluble flexible plastic material. The latter material isolates the exterior layer from the wet linens, but is sufficiently thin to be ruptured in the washing machine once the exterior layer becomes softened.
In FIGURE 8 there is illustrated still another method wherein opposing body panels 23 of hot water soluble plastic sheet material, having attached at one edge thereof a strip 24 of cold water sensitive plastic material, are brought into juxtaposition so that the respective strips are positioned, one at each set of panel edges, and the panels are bonded by heat sealing or adhesive application.
The containers of the invention, particularly laundry bags, have been tested in hospital applications and have been found to possess numerous advantages not previously obtainable using known types of containers. Among these advantages are a significant reduction'in the incidence of airborne bacteria and other organisms. The filled bags can be dropped through multistoried laundry chutes without damage or loss of contents. The invention permits the use of a single type of bag for dry, damp, wet or soiled hospital linens, and reduces labor costs in the laundry by eliminating the unpacking steps previously required, and by speeding loading time of the washing machines. At the same time the new bags do not interfere with the use of the cold flush in the washing machines to eliminate setting of blood stains and the like, in accordance with standard hospital procedure.
The laundry bags of the invention may readily be filled by suspending them from a ring stand or even over the back of a chair. Wet or dry hospital linens may be inserted up to the normal capacity of the bag. The bag is then closed 'by gathering the throat and tying it with a cold water soluble plastic tape, as shown in FIGURE 4. The bag is transported to the laundry room on a cart or via a laundry chute. In the laundry room the filled bag is thrown directly into the washing machine without being opened or loosened. In the wash wheel of the machine, the first flush of Water at body temperature or colder is introduced to avoid the setting of stains from blood and other body discharges. This first flush actsupon the cold water soluble tape at the throat of the bag and upon the seam tapes or layers of cold water sensitive plastic. The weakened tape and side seams rupture under the impact of the wash load and the front and rear panels fall apart, allowing the soiled linen contents to spill out into the water. After several cold rinses, the hot water sudsing and rinsing cycles are performed, during which the entire laundry bag dissolves, including both the hot Water soluble panel ,sheets and the cold water soluble tapes, and is removed in the discharge from the washing machine.
The water sensitive flexible .plastic material employed for the fabrication of containers in accordance with the presently preferred practice of the invention is polyvinyl alcohol sheet or film, of varying thickness, and of varying types, depending upon the water sensitivity or solubility characteristics desired.
For the container panels, there are two film characteristics of importance: (a) hot water solubility, and (b) damp stability. The criterion of hot water solubility which has proven desirable is that the panel must dissolve completely in 170 F. Water within a period of 5 minutes, with agitation. At the same time, the .panel material must be substantially insoluble in supply water. Accordingly, the expression hot water soluble is used herein to designate materials which are soluble in water at higher temperature but are substantially insoluble in water at about 10 F. or lower. Damp stability is defined as the ability of the film to maintain its integrity as a film while in contact with damp linens.
It has been found advantageous to prepare the hot water soluble ,panel material from polyvinyl alcohol formulations which has a relatively low glycerol content in order to reduce sensitivity to moisture. Generally, between about 10 and about 18 pounds of glycerol, and preferably between about- 13 and about 16 pounds of glycerol, per pounds of resin, are desirablyincluded in the formulation. Thus, there may be employed for the bag panel material, polyvinyl alcohol film material hav ing the general range of hot water solubility desired, but with their damp stability controlled by the glycerol content. Such hot water soluble, cold water insoluble polyvinyl alcohol films are well known and are described, for
example, in US. Patent 2,413,789 (Example ,I) and 2,642,419 (Example 1).
The polyvinyl alcohol film to be used for the hot water. soluble panels preferably has the following characteristics:
Thickness 0.5-10 mils.
Average yield 21,600 sq. in./lb./mil. Specific gravity 1.21-1.31.
Tensile strength 6,000 p.s.i. (minimum).
100% modulus (force required to double the length) 2,500 p.s.i. (minimum). Elongation 300-600%. Internal tear resistance 500 gm./mil (minimum).
Heat sealing 260 F., 5-10 see. Flammability Slow burning.
A suitable film formulation for container panels made of hot water soluble polyvinyl alcohol is as follows:
Parts by weight The cold water sensitive polyvinyl alcohol which is used for tying tape and for side seam scaling in accordance with the invention is one which tends to soften in cold Water, although not necessarily to dissolve completely. By cold water is meant water at a temperature .up to about 100 F. Thus, for practical purposes a suitable cold water sensitive tape or layer is one which will release thecontents of the bag in cold water in less than 2 minutes, preferably less than 1 minute. This characteristic is illustrated in the graph of FIGURE 9, which shows the release time, with mild agitation, relative to water temperature, employing a suitable cold water sensitive tape (Reynolon PVA/WS-13) in the bag seams. Cold water sensitive or soluble polyvinyl alcohol has longbeen known and is disclosed, for example, in Patent 2,502,715 (Example 6) and 2,750,027 (col. 2, lines 55-60).
Cold water sensitive polyvinyl alcohol film for use as a seam material and for binding the bag mouth preferably has the following characteristics:
Thickness About 0.015 in. Average yield 21,600 sq. in./lb./mil. Specific gravity 1.21-1.31.
Tensile strength 2,000 p.s.i. (minimum).
100% modulus (force rerequired to double the length) 1,000 p.s.i. (minimum). Elongation 250-600%. Internal tear resistance 200 gmJmil (minimum). Heat sealing 300 F., 1 sec. Flammability Slow burning.
7 number of air-borne bacteria to as little as 10% of the number present when conventional techniques were employed.
While present preferred embodiments of the invention have been illustrated and described, the invention may be otherwise variously embodied and practiced within the scope of the following claims.
What is claimed is:
1. A water soluble flexible container adapted to release its contents when immersed in water having a temperature up to about 100 F and which is substantially completely soluble in hot water, comprising superimposed panels of hot water soluble flexible plastic material defining a body portion to receive such contents, the top margins of said panels being separable to provide an opening for filling the container, and a thin flat narrow layer of cold water sensitive plastic material bonded between the panels along substantially coterminous edges thereof to form a releasable seam in said body portion.
2. A water soluble plastic fllm laundry bag which is adapted to hold wet linens at body temperature or colder and which is adapted to release its contents when immersed in water having a temperature up to about 100 F., and thereafter to dissolve completely in hot water,
comprising superimposed panels of hot water soluble flexible plastic film having good damp stability, a thin flat narrow layer of cold water sensitive plastic material bonded between opposing panels to form a releasable seam in said body portion, the top margins of the panels being separable to provide an opening for filling the bag.
3. A water soluble plastic film laundry bag which is adapted to hold wet linens at body temperature or colder and which is adapted to release its contents substantially immediately when immersed in water having a temperature up to about F., and thereafter to dissolve completely in hot water, comprising sheets of hot water soluble polyvinyl alcohol film having good damp stability superimposed with their longitudinal edges substantially coterminous, the top margins of said sheets being separable to provide an opening for filling the bag, a thin flat narrow layer of cold water soluble plastic material interposed between the sheets along said longitudinal edges, said sheets and interposed plastic layer being bonded to form a pair of releasable edge seams.
References Cited by the Examiner UNITED STATES PATENTS 1,935,663 11/1933 Phair 8137 1,961,606 6/1934 Ells '8--137 2,331,955 10/ 1943 Beebe et a1.
2,462,037 2/ 1949 Davis 117122 2,477,344 7/1949 Neumann 117-122 2,539,395 1/1951 Banks.
2,636,007 4/ 1953 Jurgensen et a1.
2,636,008 4/1953 Jurgensen et al 206-84 2,750,027 6/1956 Cummings 206.5
2,960,134 11/1960 Fornas 150.5
2,969,101 l/1961 White 150.5
FOREIGN PATENTS 1,192,726 4/ 1959 France.
THERON E. CONDON, Primary Examiner.
NORMAN G. TORCHIN, FRANKLIN T. GARRETT,
Examiners.
D. LEVY, V. A. TOMPSON, J. M. CASKIE,
Assistant Examiners.

Claims (1)

1. A WATER SOLUBLE FLEXIBLE CONTAINER ADAPTED TO RELEASE ITS CONTENTS WHEN IMMERSED IN WATER HAVING A TEMPERATURE UP TO ABOT 100* F. AND WHICH IS SUBSTANTIALLY COMPLETELY SOLUBLE IN HOT WATER, COMPRISING SUPERIMPOSED PANELS OF HOT WATER SOLUBLE FLEXIBLE PLASTIC MATERIAL DEFINING A BODY PORTION TO RECEIVE SUCH CONTENTS, THE TOP MARGINS OF SAID PANELS BEING SEPARABLE TO PROVIDE AN OPENING FOR FILLING THE CONTAINER, AND A THIN FLAT NARROW LAYER OF COLD WATER SENSITIVE PLASTIC MATERIAL BONDED BETWEEN THE PANELS ALONG SUBSTANTIALLY COTERMINOUS EDGES THEREOF TO FORM A RELEASABLE SEAM IN SAID BODY PORTION.
US219833A 1962-08-28 1962-08-28 Flexible packaging system Expired - Lifetime US3279511A (en)

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Application Number Priority Date Filing Date Title
BE636692D BE636692A (en) 1962-08-28
NL297149D NL297149A (en) 1962-08-28
US219833A US3279511A (en) 1962-08-28 1962-08-28 Flexible packaging system
GB30806/63A GB1047034A (en) 1962-08-28 1963-08-02 Improvements in or relating to containers adapted to release their contents when immersed in water
FR944901A FR1367875A (en) 1962-08-28 1963-08-16 Improvements to flexible and water-soluble packaging materials, to containers made from such materials, and to processes for their production and use
CH1054063A CH423695A (en) 1962-08-28 1963-08-26 Laundry container soluble in water, process for its manufacture and use of the laundry container
DE19631485094 DE1485094A1 (en) 1962-08-28 1963-08-28 Flexible container, especially for laundry, and process for its manufacture

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BE (1) BE636692A (en)
CH (1) CH423695A (en)
DE (1) DE1485094A1 (en)
FR (1) FR1367875A (en)
GB (1) GB1047034A (en)
NL (1) NL297149A (en)

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US3705659A (en) * 1970-09-18 1972-12-12 William L Mackie Erodable material
US3762454A (en) * 1971-11-15 1973-10-02 R Wilkins Disposable garbage container
US3886610A (en) * 1971-08-13 1975-06-03 Huntington Inst Of Applied Med Hospital bed
US3892905A (en) * 1970-08-12 1975-07-01 Du Pont Cold water soluble plastic films
US4188304A (en) * 1977-05-18 1980-02-12 Lever Brothers Company Detergent composition in a water-insoluble bag having a water-sensitive seal
US5133683A (en) * 1991-10-15 1992-07-28 Alan Dorfman Toy including a dissolvable outer package
US5143133A (en) * 1992-01-21 1992-09-01 U.S. Packaging, Inc. Furniture covering for shipment
US5190725A (en) * 1990-04-19 1993-03-02 Winfield Industries Chemical treatment of an infectious waste
US5273476A (en) * 1991-10-15 1993-12-28 Alan Dorfman Toy including a dissolvable outer package
US5387147A (en) * 1992-05-20 1995-02-07 Mitsui Co., Ltd. Water-soluble balloon
US5409315A (en) * 1992-02-19 1995-04-25 Evans; Philip S. Soluble articles for measuring or transferring materials and methods and systems using the articles
US5891812A (en) * 1996-10-11 1999-04-06 Isolyser Company, Inc. Liquid absorbable non-permeable fabrics and methods of making, using, and disposing thereof
US6015373A (en) * 1998-08-04 2000-01-18 Kenneth Fox Supply Co. Method for wicket-top converting of a cross-laminated synthetic resin fiber mesh bag
US6024489A (en) * 1998-10-16 2000-02-15 Kenneth Fox Supply Company Produce bag with improved strength and loading features
US6057015A (en) * 1997-09-02 2000-05-02 Burlington Bio-Medical And Scientific Corporation Containers and methods for waste recycling
US6080093A (en) * 1997-07-03 2000-06-27 Kenneth Fox Supply Company Apparatus for wicket-top converting of a cross-laminated synthetic resin fiber mesh bag
US6102457A (en) * 1999-03-26 2000-08-15 Smith; Barbara Ruth System for collection and disposal of pet waste or compostables
US6190044B1 (en) 1998-10-16 2001-02-20 Kenneth Fox Supply Company Produce bag with improved strength and loading features
WO2002012615A1 (en) * 2000-08-05 2002-02-14 The Procter & Gamble Company A bag
US6371645B1 (en) * 1997-09-22 2002-04-16 Amoco Nisseki Claf, Inc. Open mesh bag
US20020102033A1 (en) * 1998-09-22 2002-08-01 Paul Antonacci Side-sealed bag having label section and method of production therefor
US6626570B2 (en) 1998-10-16 2003-09-30 Kenneth Fox Supply Company Produce bag with draw top
US20050163979A1 (en) * 2004-01-26 2005-07-28 Gary Mawby Treated foil wrapping and method of manufacture
US7163339B1 (en) 2001-04-16 2007-01-16 Plaspack U.S.A., Inc. Composite breathable produce bag with a reinforced mesh sidewall
US20070011992A1 (en) * 2003-05-09 2007-01-18 Plaspack Usa, Inc. Multi-Material Vertical Form, Fill and Seal Bag Forming Method
WO2008005977A3 (en) * 2006-07-05 2008-03-20 Woodlark Circle Inc Single use air mattress
WO2009033617A1 (en) * 2007-09-06 2009-03-19 Andreas Siggelkow Water-soluble packaging having a functional storage, and the production and use thereof
US20110048592A1 (en) * 2009-08-26 2011-03-03 Mcneil Katherine Amby Knitting containment device
US20110127270A1 (en) * 2009-11-30 2011-06-02 Hartman Keith Water soluble laundry bag and receptacle therefor
US8784967B2 (en) 2009-10-09 2014-07-22 Volm Companies, Inc. Open mesh material and bags made therefrom
USD741195S1 (en) * 2013-02-05 2015-10-20 Laminda Kay Nickla Disposal bag
US20170313962A1 (en) * 2014-10-16 2017-11-02 Lg Household & Health Care Ltd. Envelope type detergent
CN109642190A (en) * 2016-09-20 2019-04-16 株式会社 Lg 生活健康 Reinforce the pouch-shaped detergent of water resistance
US20190322422A1 (en) * 2018-04-19 2019-10-24 Chris Hoe Lam Lee Reinforced polybag with mesh window and methods of manufacturing the same
CN110373882A (en) * 2019-08-16 2019-10-25 贵州大学 A kind of clothing quick wash packet

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GB2240090A (en) * 1990-01-20 1991-07-24 Ciba Geigy Ag Container
GB2283723B (en) * 1993-11-12 1997-07-23 Hpc Flexible Packaging Limited Laundry bag
FR2785301B1 (en) * 1998-10-29 2001-01-26 Electrolux Syst Blanchisserie METHOD AND INSTALLATION FOR BARRIER LAUNDRY AND WATERPROOF LINEN TRANSFER DEVICE FOR USE IN SUCH AN INSTALLATION
CL2016001885A1 (en) * 2016-07-25 2018-04-20 Solubag Spa Hydrodegradable bag

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US2750027A (en) * 1951-08-21 1956-06-12 Cummings Molly Visual indicating devices for producing a color slick or patch at sea or in any waters
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US2960134A (en) * 1959-06-01 1960-11-15 Hollywood Plastics Inc Stackable plastic container
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US2636007A (en) * 1953-04-21 Detergent package and method of
US1935663A (en) * 1928-06-16 1933-11-21 Kohnstamm & Co Inc H Laundering method
US1961606A (en) * 1932-04-06 1934-06-05 Warren Soap Mfg Company Inc Method of laundering
US2331955A (en) * 1942-02-24 1943-10-19 Columbian Rope Co Thread
US2462037A (en) * 1943-01-11 1949-02-15 Mclaurin Jones Co Sealing and reinforcing tape
US2477344A (en) * 1944-03-01 1949-07-26 Shand Kydd Ltd Pregummed paper, eabric, and other materials
US2539395A (en) * 1946-06-12 1951-01-30 Millard S Banks Water disintegratable soap package
US2636008A (en) * 1949-09-03 1953-04-21 American Mach & Foundry Detergent package and method of making same
US2750027A (en) * 1951-08-21 1956-06-12 Cummings Molly Visual indicating devices for producing a color slick or patch at sea or in any waters
FR1192726A (en) * 1958-03-06 1959-10-28 Roehm & Haas Gmbh Laundry bag
US2969101A (en) * 1958-09-18 1961-01-24 Chase Bag Company Explosive bag
US2960134A (en) * 1959-06-01 1960-11-15 Hollywood Plastics Inc Stackable plastic container

Cited By (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3892905A (en) * 1970-08-12 1975-07-01 Du Pont Cold water soluble plastic films
US3705659A (en) * 1970-09-18 1972-12-12 William L Mackie Erodable material
US3886610A (en) * 1971-08-13 1975-06-03 Huntington Inst Of Applied Med Hospital bed
US3762454A (en) * 1971-11-15 1973-10-02 R Wilkins Disposable garbage container
US4188304A (en) * 1977-05-18 1980-02-12 Lever Brothers Company Detergent composition in a water-insoluble bag having a water-sensitive seal
US5190725A (en) * 1990-04-19 1993-03-02 Winfield Industries Chemical treatment of an infectious waste
US5273476A (en) * 1991-10-15 1993-12-28 Alan Dorfman Toy including a dissolvable outer package
US5133683A (en) * 1991-10-15 1992-07-28 Alan Dorfman Toy including a dissolvable outer package
US5143133A (en) * 1992-01-21 1992-09-01 U.S. Packaging, Inc. Furniture covering for shipment
US5409315A (en) * 1992-02-19 1995-04-25 Evans; Philip S. Soluble articles for measuring or transferring materials and methods and systems using the articles
US5387147A (en) * 1992-05-20 1995-02-07 Mitsui Co., Ltd. Water-soluble balloon
US5891812A (en) * 1996-10-11 1999-04-06 Isolyser Company, Inc. Liquid absorbable non-permeable fabrics and methods of making, using, and disposing thereof
US6080093A (en) * 1997-07-03 2000-06-27 Kenneth Fox Supply Company Apparatus for wicket-top converting of a cross-laminated synthetic resin fiber mesh bag
US6057015A (en) * 1997-09-02 2000-05-02 Burlington Bio-Medical And Scientific Corporation Containers and methods for waste recycling
US6371645B1 (en) * 1997-09-22 2002-04-16 Amoco Nisseki Claf, Inc. Open mesh bag
US6015373A (en) * 1998-08-04 2000-01-18 Kenneth Fox Supply Co. Method for wicket-top converting of a cross-laminated synthetic resin fiber mesh bag
US6974406B2 (en) 1998-09-22 2005-12-13 Paul Antonacci Side-sealed bag having label section and method of production therefor
US20020102033A1 (en) * 1998-09-22 2002-08-01 Paul Antonacci Side-sealed bag having label section and method of production therefor
US6626570B2 (en) 1998-10-16 2003-09-30 Kenneth Fox Supply Company Produce bag with draw top
US6190044B1 (en) 1998-10-16 2001-02-20 Kenneth Fox Supply Company Produce bag with improved strength and loading features
US6416220B1 (en) 1998-10-16 2002-07-09 Kenneth Fox Supply Co. Produce bag with improved strength and loading features
US6030120A (en) * 1998-10-16 2000-02-29 Kenneth Fox Supply Co. Produce bag with improved wicket features
US6024489A (en) * 1998-10-16 2000-02-15 Kenneth Fox Supply Company Produce bag with improved strength and loading features
US6102457A (en) * 1999-03-26 2000-08-15 Smith; Barbara Ruth System for collection and disposal of pet waste or compostables
WO2002012615A1 (en) * 2000-08-05 2002-02-14 The Procter & Gamble Company A bag
US7163339B1 (en) 2001-04-16 2007-01-16 Plaspack U.S.A., Inc. Composite breathable produce bag with a reinforced mesh sidewall
US8550717B2 (en) 2001-04-16 2013-10-08 Plaspack U.S.A., Inc. Composite breathable produce bag with a reinforced mesh sidewall
US7837388B1 (en) 2003-05-09 2010-11-23 Plaspack Usa, Inc. Multi-material vertical form, fill and seal bag
US20070011992A1 (en) * 2003-05-09 2007-01-18 Plaspack Usa, Inc. Multi-Material Vertical Form, Fill and Seal Bag Forming Method
US7640715B2 (en) 2003-05-09 2010-01-05 Plaspack Usa, Inc. Multi-material vertical form, fill and seal bag forming method
US20050163979A1 (en) * 2004-01-26 2005-07-28 Gary Mawby Treated foil wrapping and method of manufacture
CN101478898B (en) * 2006-07-05 2012-09-05 伍德拉克圆周公司 Single use air mattress
WO2008005977A3 (en) * 2006-07-05 2008-03-20 Woodlark Circle Inc Single use air mattress
AU2007269184B2 (en) * 2006-07-05 2012-02-02 D.T. Davis Enterprises, Ltd. Single use air mattress
WO2009033617A1 (en) * 2007-09-06 2009-03-19 Andreas Siggelkow Water-soluble packaging having a functional storage, and the production and use thereof
US20110048592A1 (en) * 2009-08-26 2011-03-03 Mcneil Katherine Amby Knitting containment device
US9339986B2 (en) 2009-10-09 2016-05-17 Volm Companies, Inc. Open mesh material and bags made therefrom
US10934042B2 (en) 2009-10-09 2021-03-02 Volm Companies, Inc. Method of making form, fill, and seal bags
US8784967B2 (en) 2009-10-09 2014-07-22 Volm Companies, Inc. Open mesh material and bags made therefrom
US9573342B2 (en) 2009-10-09 2017-02-21 Volm Companies, Inc. Open-mesh bags and methods of production
US9630375B2 (en) 2009-10-09 2017-04-25 Volm Companies, Inc. Form, fill, and seal bags and method of production
US20110127270A1 (en) * 2009-11-30 2011-06-02 Hartman Keith Water soluble laundry bag and receptacle therefor
US8691257B2 (en) 2009-11-30 2014-04-08 Cintas Corporation Water soluble laundry bag and receptacle therefor
USD741195S1 (en) * 2013-02-05 2015-10-20 Laminda Kay Nickla Disposal bag
US20170313962A1 (en) * 2014-10-16 2017-11-02 Lg Household & Health Care Ltd. Envelope type detergent
US10723984B2 (en) * 2014-10-16 2020-07-28 Lg Household & Health Care Ltd. Envelope type detergent
US10781412B2 (en) * 2016-09-20 2020-09-22 Lg Household & Health Care Ltd. Detergent in the form of a laundry storage envelope having enhanced resistance to water
CN109642190A (en) * 2016-09-20 2019-04-16 株式会社 Lg 生活健康 Reinforce the pouch-shaped detergent of water resistance
CN109642190B (en) * 2016-09-20 2021-08-31 株式会社 Lg 生活健康 Water-resistant reinforced bag-shaped detergent
US20190322422A1 (en) * 2018-04-19 2019-10-24 Chris Hoe Lam Lee Reinforced polybag with mesh window and methods of manufacturing the same
CN110373882A (en) * 2019-08-16 2019-10-25 贵州大学 A kind of clothing quick wash packet

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Publication number Publication date
FR1367875A (en) 1964-07-24
BE636692A (en)
CH423695A (en) 1966-11-15
GB1047034A (en) 1966-11-02
DE1485094A1 (en) 1970-01-02
NL297149A (en)

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