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Publication numberUS20050034806 A1
Publication typeApplication
Application numberUS 10/794,349
Publication dateFeb 17, 2005
Filing dateMar 4, 2004
Priority dateMar 5, 2003
Also published asUS7625459, US20060243386
Publication number10794349, 794349, US 2005/0034806 A1, US 2005/034806 A1, US 20050034806 A1, US 20050034806A1, US 2005034806 A1, US 2005034806A1, US-A1-20050034806, US-A1-2005034806, US2005/0034806A1, US2005/034806A1, US20050034806 A1, US20050034806A1, US2005034806 A1, US2005034806A1
InventorsHongyu Wu, Charles Albritton, David Brakes
Original AssigneeTilia International, Inc.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method for manufacturing liquid-trapping bag for use in vacuum packaging
US 20050034806 A1
Abstract
A method for manufacturing a bag for use in vacuum packaging comprises forming a first panel having a plurality of baffles for evacuating air and/or other gases from inside the bag using a suction source, while preventing liquids from being drawn into the suction source, and a second panel. Each panel comprises a gas-impermeable base layer and a heat-sealable inner layer molded from melt-extruded resin. The first panel is overlapped with the second panel, and three of four edges of the panels are heated such that the inner layers bond at the heated edges. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims.
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Claims(29)
1. A method for forming a panel for use in a sealable bag, comprising:
flowing a material onto a backing film, such that the flowing material is molded to form a structure;
wherein the structure includes a plurality of protuberances;
cooling the flowing material such that the flowing material solidifies to form an inner layer having the structure; and
wherein the inner layer adheres to the backing film.
2. A method for forming a bag adapted to receive an article, the bag being partially formed between a laminating roll and a cooling roll having a plurality of cavities for forming a structure, comprising:
feeding a gas-impermeable film to a nip formed by the cooling roll and the laminating roll;
extruding resin such that the resin fills the nip and the plurality of cavities exposed to the nip;
pressing the resin between the cooling roll and the laminating roll;
cooling the resin such that the resin forms the structure and adheres to the gas-impermeable film, forming a panel;
wherein the structure comprises a plurality of protuberances;
folding the panel such that a first portion of the panel overlaps a second portion of the panel; and
applying heat to a first, second, and third side of the first and second portions such that an envelope is formed.
3. A method for manufacturing a bag adapted to receive an article, comprising:
feeding a first gas-impermeable film to a first nip between a first cooling roll and a first laminating roll, the first cooling roll having a plurality of cavities for forming a structure;
extruding molten resin to the first nip;
pressing the molten resin between the first cooling roll and the first gas-impermeable film such that the molten resin fills the plurality of cavities exposed to the first nip;
cooling the resin such that the resin forms the structure and adheres to the gas-impermeable film, forming a first panel;
wherein the structure comprises a plurality of protuberances;
feeding a second gas-impermeable film to a second nip between a second cooling roll and a second laminating roll;
extruding molten resin to the second nip;
pressing the molten resin between the second cooling roll and the second gas-impermeable film;
cooling the molten resin such that a second inner layer is formed;
wherein the second inner layer adheres to the second gas-impermeable film, thereby forming a second panel;
overlapping the first panel with the second panel; and
applying heat to a first, second, and third side of the first and second panels such that the first panel and the second panel form an envelope.
4. A method for manufacturing a bag adapted to receive an article, comprising:
rotating a first cooling roll at a first rate, the first cooling roll including one or both of a plurality of cavities and a plurality of protuberances for forming a structure having a plurality of channels defined at least partially by a plurality of baffles;
rotating a first laminating roll at a second rate;
introducing a first gas-impermeable film having at least one layer to a first nip between the first cooling roll and the first laminating roll;
extruding molten resin to the first nip;
pressing the molten resin between the first cooling roll and the first gas-impermeable film such that the molten resin fills the plurality of cavities exposed to the first nip;
cooling the molten resin such that a first inner layer is formed;
wherein the first inner layer comprises the structure;
wherein the first inner layer adheres to the first gas-impermeable film, thereby forming a first panel;
rotating a second cooling roll at a third rate;
rotating a second laminating roll at a fourth rate;
introducing a second gas-impermeable film having at least one layer to a second nip between the second cooling roll and the second laminating roll;
extruding molten resin to the second nip;
pressing the molten resin between the second cooling roll and the second gas-impermeable film;
cooling the molten resin such that a second inner layer is formed;
wherein the second inner layer adheres to the second gas-impermeable film, thereby forming a second panel;
overlapping the first panel with the second panel; and
applying heat to a portion of a periphery the first and second panels such that the first panel and the second panel form an envelope.
5. The method of claim 4, wherein the second rate is an integer multiple of the first rate and the fourth rate is an integer multiple of the third rate.
6. The method of claim 4, wherein the first gas-impermeable film and the second gas-impermeable film comprise at least one layer.
7. The method of claim 6, wherein the at least on layer is one of polyester, polyamide, ethylene vinyl alcohol, and nylon.
8. The method of claim 4, wherein the molten resin is polyethylene.
9. The method of claim 4, wherein a thickness of the first inner layer is determined by the size of the first nip and the thickness of the second inner layer is determined by the size of the second nip.
10. The method of claim 4, wherein the plurality of protuberances are a plurality of baffles.
11. The method of claim 4, wherein the plurality of protuberances are a plurality of vessels.
12. The method of claim 4, wherein the plurality of protuberances are a plurality of catches.
13. A method of manufacturing a bag adapted to receive an article, comprising:
rotating a first roller having a plurality of recesses that can define a plurality of receptacles;
rotating a second roller adjacent to the first roller, said second roller can feed a first film adjacent to the first roller;
applying a molten material between the first roller and the film;
said molten material filling the recesses of the first roller, and said molten material and film moving between the first roller and the second roller forming a first panel with a plurality of receptacles;
forming a second panel; and
mating the first panel to the second panel in order to form a bag.
14. The method of claim 13 including:
using a gas impermeable material for the film; and
using a heat sealable material for the molten material.
15. The method of claim 13, wherein forming the plurality of receptacles forms a plurality of baffles.
16. The method of claim 13, wherein forming the plurality of receptacles forms a plurality of vessels.
17. The method of claim 13, wherein forming the plurality of receptacles forms a plurality of catches.
18. The method of claim 13, wherein said second panel is formed with the first roller and the second roller.
19. The method of claim 13, wherein said second panel is formed with the first roller and the second roller, and the mating step includes folding the first panel over the second panel.
20. The method of claim 13, wherein said first roller includes a peripheral surface having a first portion including the plurality of recesses for defining a plurality of receptacles and a second portion without a plurality of recesses.
21. The method of claim 13, wherein the first roller includes another plurality of recesses that can be filled with the molten material to form channels that run the length of the film.
22. The method of claim 13 including forming the receptacles in part with walls that run parallel to the length of the film and in part with walls that run across the length of the firm.
23. The method of claim 13 including forming the receptacle from the plurality of recesses with some of the plurality of recesses running the parallel to the length of the film and some of the plurality of recesses running across the length of the firm.
24. The method of claim 13 including forming the receptacles from the plurality of recesses with some of the plurality of recesses running in about the direction of rotation of a peripheral surface of the first roller and some of the recesses running in about a direction across the direction of rotation of the peripheral surface.
25. The method of claim 13, wherein forming the plurality of receptacles forms U shaped receptacles.
26. The method of claim 13, wherein forming the plurality of receptacles forms V shaped receptacles.
27. The method of claim 13, wherein forming the plurality of receptacles forms L shaped receptacles.
28. The method of claim 13, wherein forming the plurality of receptacles forms a plurality of liquid trapping shapes.
29. The method of claim 13, wherein a passage is formed the plurality of receptacles such that gas flows through the passage.
Description
    PRIORITY CLAIM
  • [0001]
    This application claims priority to the following U.S. Provisional patent application:
      • U.S. Provisional Patent Application No. 60/452,138, entitled “METHOD FOR MANUFACTURING LIQUID-TRAPPING BAG FOR USE IN VACUUM PACKAGING,” by Henry Wu, et al., filed Mar. 5, 2003 (Attorney Docket No. TILA-01177US1).
  • CROSS-REFERENCE TO RELATED PATENT APPLICATIONS
  • [0003]
    This U.S. Patent Application incorporates by reference all of the following co-pending applications:
      • U.S. Provisional Patent Application No. 60/452,168, entitled “LIQUID-TRAPPING BAG FOR USE IN VACUUM PACKAGING,” by Henry Wu, et al., filed Mar. 5, 2003 (Attorney Docket No. TILA-01177US0);
      • U.S. Provisional Patent Application No. 60/452,172, entitled “SEALABLE BAG HAVING AN INTEGRATED TRAY FOR USE IN VACUUM PACKAGING,” by Henry Wu, et al., filed Mar. 5, 2003 (Attorney Docket No. TILA-01178US0);
      • U.S. Provisional Patent Application No. 60/452,171, entitled “METHOD FOR MANUFACTURING A SEALABLE BAG HAVING AN INTEGRATED TRAY FOR USE IN VACUUM PACKAGING,” by Henry Wu, et al., filed Mar. 5, 2003 (Attorney Docket No. TILA-01178US1);
      • U.S. Provisional Patent Application No. 60/451,954, entitled “SEALABLE BAG HAVING AN INDICIA FOR USE IN VACUUM PACKAGING,” by Henry Wu, et al., filed Mar. 5, 2003 (Attorney Docket No. TILA-01179US0);
      • U.S. Provisional Patent Application No. 60/451,948, entitled “METHOD FOR MANUFACTURING A SEALABLE BAG HAVING AN INDICIA FOR USE IN VACUUM PACKAGING,” by Henry Wu, et al., filed Mar. 5, 2003 (Attorney Docket No. TILA-01179US1);
      • U.S. Provisional Patent Application No. 60/452,142, entitled “SEALABLE BAG HAVING AN INTEGRATED ZIPPER FOR USE IN VACUUM PACKAGING,” by Henry Wu, et al., filed Mar. 5, 2003 (Attorney Docket No. TILA-01180US0);
      • U.S. Provisional Patent Application No. 60/452,021, entitled “METHOD FOR MANUFACTURING A SEALABLE BAG HAVING AN INTEGRATED ZIPPER FOR USE IN VACUUM PACKAGING,” by Henry Wu, et al., filed Mar. 5, 2003 (Attorney Docket No. TILA-01180US1);
      • U.S. Provisional Patent Application No. 60/451,955, entitled “SEALABLE BAG HAVING AN INTEGRATED VALVE STRUCTURE FOR USE IN VACUUM PACKAGING,” by Henry Wu, et al., filed Mar. 5, 2003 (Attorney Docket No. TILA-01181US0);
      • U.S. Provisional Patent Application No. 60/451,956, entitled “METHOD FOR MANUFACTURING A SEALABLE BAG HAVING AN INTEGRATED VALVE STRUCTURE FOR USE IN VACUUM PACKAGING,” by Henry Wu, et al., filed Mar. 5, 2003 (Attorney Docket No. TILA-01181US1);
      • U.S. Provisional Patent Application No. 60/452,157, entitled “SEALABLE BAG HAVING AN INTEGRATED TIMER/SENSOR FOR USE IN VACUUM PACKAGING,” by Henry Wu, et al., filed Mar. 5, 2003 (Attorney Docket No. TILA-01182US0);
      • U.S. Provisional Patent Application No. 60/452,139, entitled “METHOD FOR MANUFACTURING A SEALABLE BAG HAVING AN INTEGRATED TIMER/SENSOR FOR USE IN VACUUM PACKAGING,” by Henry Wu, et al., filed Mar. 5, 2003 (Attorney Docket No. TILA-01182US1);
      • U.S. patent application Ser. No. 10/169,485, entitled “METHOD FOR PREPARING AIR CHANNEL EQUIPPED FILM FOR USE IN VACUUM PACKAGE”, filed Jun. 26, 2002;
      • U.S. patent application Ser. No. ______, entitled “LIQUID-TRAPPING BAG FOR USE IN VACUUM PACKAGING,” Attorney Docket No. TILA-01177US2, filed concurrently;
      • U.S. Patent Application No., entitled “SEALABLE BAG HAVING AN INTEGRATED TRAY FOR USE IN VACUUM PACKAGING,” Attorney Docket No. TILA-01178US2, filed concurrently;
      • U.S. patent application Ser. No. ______, entitled “METHOD FOR MANUFACTURING A SEALABLE BAG HAVING AN INTEGRATED TRAY FOR USE IN VACUUM PACKAGING,” Attorney Docket No. TILA-01178US3, filed concurrently;
      • U.S. patent application Ser. No. ______, entitled “SEALABLE BAG HAVING AN INDICIA FOR USE IN VACUUM PACKAGING,” Attorney Docket No. TILA-01179US2, filed concurrently;
      • U.S. patent application Ser. No. ______, entitled “METHOD FOR MANUFACTURING A SEALABLE BAG HAVING AN INDICIA FOR USE IN VACUUM PACKAGING,” Attorney Docket No. TILA-01179US3, filed concurrently;
      • U.S. patent application Ser. No. ______, entitled “SEALABLE BAG HAVING AN INTEGRATED ZIPPER FOR USE IN VACUUM PACKAGING,” Attorney Docket No. TILA-01180US2, filed concurrently;
      • U.S. patent application Ser. No. ______, entitled “METHOD FOR MANUFACTURING A SEALABLE BAG HAVING AN INTEGRATED ZIPPER FOR USE IN VACUUM PACKAGING,” Attorney Docket No. TILA-01180US3, filed concurrently;
      • U.S. patent application Ser. No. ______, entitled “SEALABLE BAG HAVING AN INTEGRATED VALVE STRUCTURE FOR USE IN VACUUM PACKAGING,” Attorney Docket No. TILA-01181US2, filed concurrently;
      • U.S. patent application Ser. No. ______, entitled “METHOD FOR MANUFACTURING A SEALABLE BAG HAVING AN INTEGRATED VALVE STRUCTURE FOR USE IN VACUUM PACKAGING,” Attorney Docket No. TILA-01181US3, filed concurrently;
      • U.S. patent application Ser. No. ______, entitled “SEALABLE BAG HAVING AN INTEGRATED TIMER/SENSOR FOR USE IN VACUUM PACKAGING,” Attorney Docket No. TILA-01182US2, filed concurrently; and
  • [0026]
    U.S. patent application Ser. No. ______, entitled “METHOD FOR MANUFACTURING A SEALABLE BAG HAVING AN INTEGRATED TIMER/SENSOR FOR USE IN VACUUM PACKAGING,” Attorney Docket No. TILA-01182US3, filed concurrently.
  • FIELD OF THE INVENTION
  • [0027]
    The present invention relates to bags for use in vacuum packaging and methods and devices for manufacturing bags for use in vacuum packaging.
  • BACKGROUND
  • [0028]
    Methods and devices for preserving perishable foods such as fish and meats, processed foods, prepared meals, and left-overs, and non-perishable items are widely known, and widely varied. Foods are perishable because organisms such as bacteria, fungus and mold grow over time after a food container is opened and the food is left exposed to the atmosphere. Most methods and devices preserve food by protecting food from organism-filled air. A common method and device includes placing food into a gas-impermeable plastic bag, evacuating the air from the bag using suction from a vacuum pump or other suction source, and tightly sealing the bag.
  • [0029]
    A bag for use in vacuum packaging can consist of a first panel and second panel, each panel consisting of a single layer of heat-sealable, plastic-based film (for example, polyethylene). The panels are sealed together along a substantial portion of the periphery of the panels by heat-sealing techniques so as to form an envelope. Perishable products, such as spoilable food, or other products are packed into the envelope via the unsealed portion through which air is subsequently evacuated. After perishable products are packed into the bag and air is evacuated from the inside of the bag, the unsealed portion is heated and pressed such that the panels adhere to each other, sealing the bag.
  • [0030]
    U.S. Pat. No. 2,778,173, incorporated herein by reference, discloses a method for improving the evacuation of air from the bag by forming channels in at least one of the panels with the aid of embossing techniques. Air escapes from the bag along the channels during evacuation. The embossing forms a pattern of protuberances on at least one of the panels. The protuberances can be discrete pyramids, hemispheres, etc., and are formed by pressing a panel using heated female and male dies. The first panel is overlaid on the second panel such that the protuberances from one panel face the opposite panel. The contacting peripheral edges of the panels are sealed to each other to form an envelope having an inlet at an unsealed portion of the periphery. The perishable or other products are packed into the envelope through the inlet, and the inlet is sealed. Thereafter, an opening is pierced in a part of the panel material that communicates with the channels, air is removed from the interior of the envelope through the channels and opening, and the opening is sealed. This type of bag requires two additional sealing steps after the perishable or other product is packed into the envelope. One further problem is that embossing creates impressions on the plastic such that indentations are formed on the opposite side of the panel
  • [0031]
    To avoid additional sealing steps, a vacuum bag is formed having a first panel and a second panel consisting of laminated films. Each panel comprises a heat-sealable inner layer, a gas-impermeable outer layer, and optionally, one or more intermediate layers. Such a bag is described in U.S. Pat. No. Re. 34,929, incorporated herein by reference. At least one film from at least one panel is embossed using an embossing mold to form protuberances and channels defined by the space between protuberances, so that air is readily evacuated from the vacuum bag.
  • [0032]
    U.S. Pat. No. 5,554,423, incorporated herein by reference, discloses still another bag usable in vacuum packaging. The bag consists of a first and second panel, each panel consisting of a gas-impermeable outer layer and a heat-sealable inner layer. A plurality of heat-sealable strand elements are heat bonded at regular intervals to the inner layer of either the first panel or the second panel. The spaces between strand elements act as channels for the evacuation of air. The strand elements are extruded from an extrusion head and heat bonded to the heat-sealable layer by use of pressure rolls. Separate equipment is required for producing strand elements, and a procedure of heat bonding a plurality of strand elements at regular intervals to the heat-sealable inner layer is complicated. Also, various shapes of pattern are hard to form using this process.
  • BRIEF DESCRIPTION OF THE FIGURES
  • [0033]
    Further details of embodiments of the present invention are explained with the help of the attached drawings in which:
  • [0034]
    FIG. 1A is a perspective view of a method for manufacturing a vacuum bag in accordance with one embodiment of the present invention;
  • [0035]
    FIG. 1B is a side view of the method shown in FIG. 1A illustrating the embossing method used in an embodiment of the present invention;
  • [0036]
    FIG. 1C is a close-up view of a portion of FIG. 1B;
  • [0037]
    FIG. 2A is atop view of a partial portion of a first panel overlapping a partial portion of a second panel in accordance with one embodiment of the present invention;
  • [0038]
    FIG. 2B is a cross-section view through line 2B-2B of FIG. 2A;
  • [0039]
    FIG. 3A-3E are plan views of exemplary patterns on a panel in accordance with embodiments of the present invention, manufactured by the process shown in FIG. 1; and
  • [0040]
    FIG. 4 is a perspective view of a vacuum bag in accordance with one embodiment of the present invention.
  • DETAILED DESCRIPTION
  • [0041]
    FIGS. 1A-1C illustrate one embodiment of a method for manufacturing a vacuum bag in accordance with the present invention. The vacuum bag comprises a first panel and a second panel, wherein each panel comprises a gas-impermeable base layer 108 and a heat-sealable inner layer 106 with at least one panel having liquid flow obstructing protuberances and/or channels. A laminating roll 102 and a cooling roll 104 are arranged so that melt-extruded resin can be introduced between the rolls and cooled to form the heat-sealable inner layer 106 and to laminate the formed inner layer 106 to the gas-impermeable base layer 108. As illustrated in FIG. 1C, a gap between the laminating roll 102 and the cooling roll 104 can be controlled according to specifications (for example, thickness) of a panel for use in vacuum packaging. The temperature of the cooling roll 104 is maintained in a range such that the melt-extruded resin can be sufficiently cooled to form a desired pattern. For example, a temperature range of about −15 C. to about −10 C. can be sufficient to properly form the desired pattern. The temperature range of the cooling roll 104 can vary according to the composition of the resin, the composition of the gas-impermeable base layer 108, environmental conditions, etc. and can require calibration. Also, the cooling roll 104 can be sized to have a larger diameter than the laminating roll 102, thereby bringing the melt-extruded resin into contact with more cooled surface area. For example, the diameter of the cooling roll 104 can be about one-and-a-half to about three times as large (or more) as that of the laminating roll 102.
  • [0042]
    The heat-sealable inner layer 106 typically comprises a thermoplastic resin. For example, the resin can be comprised of polyethylene (PE) suitable for preserving foods and harmless to a human body. A vacuum bag can be manufactured by overlapping two panels such that the heat-sealable inner layers 106 of the two panels are brought into contact and heat is applied to a portion of the periphery of the panels to form an envelope. The thermoplastic resin can be chosen so that the two panels strongly bond to each other when sufficient heat is applied.
  • [0043]
    The gas-impermeable base layer 108 is fed to the gap between the cooling roll 104 and the laminating roll 102 by a feeding means (not shown). The gas-impermeable base layer can be comprised of polyester, polyamide, ethylene vinyl alcohol (EVOH), nylon, or other material having similar properties, that is capable of being heated and capable of being used in this manufacturing process. The gas-impermeable base layer 108 can consist of one layer, or two or more layers. When employing a multilayer-structured base layer, it should be understood that a total thickness thereof is also adjusted within the allowable range for the total gas-impermeable base layer 108.
  • [0044]
    An extruder 110 is positioned in such a way that the melt-extruded resin is layered on the gas-impermeable base layer 108 by feeding the melt-extruded resin to a nip between the cooling roll 104 and the gas-impermeable base layer 108. The resin is fed through a nozzle 112 of the extruder 110. The temperature of the melt-extruded resin is dependent on the type of resin used, and can typically range from about 200 C. to about 250 C. The amount of resin extruded into the laminating unit 100 is dependent on the desired thickness of the heat-sealable inner layer 106.
  • [0045]
    A pattern fabricated on the circumferential surface of the cooling roll 104 in accordance with one embodiment of the present invention can include cavities (and/or protuberances) defining a plurality of discrete channels having a baffled structure. The resin extruded from the nozzle 112 is pressed between the cooling roll 104 and the gas-impermeable base layer 108 and flows into the cavities of the cooling roll 104. The resin quickly cools and solidifies in the desired pattern while adhering to the gas-impermeable base layer 108, thereby forming the heat-sealable inner layer 106 of the panel. The heat-sealable inner layer 106 can be formed while the resin is sufficiently heated to allow the resin to flow, thereby molding the resin, unlike other methods adopting a post-embossing treatment where the heat-sealable inner layer is drawn by a die or embossed between male and female components.
  • [0046]
    The thickness of each protuberance formed on the heat-sealable inner layer 106 of a panel can be determined by the depth of the cavities of the cooling roll 104, and the width of the channel can be determined by the interval between the cavities. Thus, the shape, width, and thickness of the channels for the evacuation of air and/or other gases can be controlled by changing the specifications for the cavities of the cooling roll 104. FIGS. 2A and 2B illustrate a cross-section (along line 2B-2B) of two panels in accordance with one embodiment of the present invention (the thickness of the panels are exaggerated relative to the width of the channel walls and baffles). The heat-sealable inner layer 106 can range from preferably 0.5-6.0 mils in thickness at the channels 224, and preferably 1.0-12.0 mils in thickness at the protuberances 226,228, while the gas-impermeable base layer 108 can range from about preferably 0.5-8.0 mils in thickness. The dimensions of the inner layer and the base layer are set forth to illustrate, but are not to be construed to limit the dimensions of the inner layer and the base layer.
  • [0047]
    FIG. 3A is a plan view of a pattern 320 formed on a panel by the cooling roll 104 for use in a vacuum bag, in which the heat-sealable inner layer 106 is molded in such a way that protuberances form the plurality of channels 224 having channels walls 226 and baffles 228. The baffles 228 can be arranged in a herringbone pattern at angles such that air and/or other gases 340 (shown schematically) can be drawn around the baffles 228 by suction and evacuated from the vacuum bag, while heavier liquid particles 342 can be trapped between the channel walls 226 and the baffles 228. Angles formed by the intersection of baffles 228 and channel walls 226, and gaps between adjacent baffles 228 can be defined when producing the cooling roll 104 to suit the liquid intended to be trapped. Different arrangements of the baffles 228 relative to the chamber walls 226, and relative to other baffles 228 can be multi-fold (shaped to define liquid-trapping vessels), and can be optimized to improve evacuation of the air and/or other gases 340, while effectively preventing liquids 342 from being drawn out of the vacuum bag. For example, as shown in FIG. 3A the baffles 228 can be arranged such that an approach angle for passing through the channel opening between the baffles 228 is severe and that vessels formed by the baffles 228 are relatively deep, thereby retarding liquid flow by deflecting liquid 342 into the vessels and trapping a significant amount of liquid 342.
  • [0048]
    As indicated above, one of ordinary skill in the art can appreciate the multitude of different baffle arrangements for retarding the evacuation of liquid 342 relative to the evacuation of air and/or other gases 340. As shown in FIG. 3B, in other embodiments a pattern 320 fabricated on the circumferential surface of the cooling roll 104, and thereafter the panel, can mold protuberances forming a plurality of channels 224 defined by “V”-shaped baffles 228, eliminating the need for molding channel walls. In still other embodiments, the channel walls 226 can extend substantially the length of the panel with only a portion of the length of the channels near an evacuation opening having baffles 228.
  • [0049]
    As shown in FIG. 3C, in other embodiments a pattern 320 fabricated on the circumferential surface of the cooling roll 104, and thereafter the panel, can mold protuberances forming a plurality of channels 224 having channels walls 226 and baffles 228, wherein each baffle 228 extends across a substantial portion of the width of the channel 224, thereby defining a path between the baffle 228 and the channel wall 226 for the air and/or other gases 340 to be drawn. The baffles 228 can alternatively be parabolic or rounded, as shown in FIG. 3D, to form pockets for collecting liquid particles 342.
  • [0050]
    FIG. 3E illustrates still another embodiment of a pattern 320 fabricated on the circumferential surface of the cooling roll 104, and thereafter the panel, that can include parabolically-shaped or “U”-shaped baffles 228 arranged like fish-scales either along the length of the panel, or a portion of the panel to capture liquid particles 342. The U-shaped baffles 228 can also include slits 330 in the troughs of the U-shaped baffles 228 small enough to improve the flow of air and/or other gases 340 while retarding an amount of liquid particles 342. In other embodiments, the baffles 228 can be more or less parabolic. One of ordinary skill in the art can appreciate the multitude of different baffle shapes for retarding the evacuation of liquid relative to the evacuation of air or other gases.
  • [0051]
    It is understood that the trapping of liquid in baffles or vessels formed in the bag is advantageous as this structure retards and prevents liquids from being drawn into the vacuum pump or suction device of a vacuum sealing tool such as disclosed in U.S. Pat. No. 4,941,310, which is incorporated herein by reference.
  • [0052]
    FIG. 4 illustrates a bag for use in vacuum packaging in accordance with one embodiment of the present invention. The vacuum bag 450 comprises a first panel 452 and a second panel 454 overlapping each other. Channels 224 are formed on at least one of the panels 452,454 in accordance with an embodiment described above. The heat-sealable inner layer 106 and the gas-impermeable base layer 108 of the first and second panels 452,454 are typically made of the same material respectively, but can alternatively be made of different materials that exhibit heat-seal ability and gas-impermeability respectively. As described above, the resin-formed layer 106 is used as an inner layer and the gas-impermeable base layer 108 is used as an outer layer. The lower, left, and right edges of the first and the second panel 452,454 are bonded to each other by heating, so as to form an envelope for receiving a perishable or other product to be vacuum packaged. Once a perishable or other product is placed in the vacuum bag 450, air and/or other gases can be evacuated from the bag 450, for example by a vacuum sealing machine as described in the above referenced U.S. Pat. No. 4,941,310, which is incorporated herein by reference. Once the air and/or other gases are evacuated to the satisfaction of the user, the inlet can be sealed by applying heat, thereby activating the heat-sealable inner layers 106 and bonding them together where contacted by the heat.
  • [0053]
    The foregoing description of preferred embodiments of the present invention has been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. It is to be understood that many modifications and variations will be apparent to the practitioner skilled in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, thereby enabling others skilled in the art to understand the invention for various embodiments and with various modifications that are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the following claims and their equivalence.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2085766 *Sep 29, 1934Jul 6, 1937Potdevin Machine CoMethod of making bags and the like
US2265075 *Aug 7, 1940Dec 2, 1941Thomas M Royal & CompanyMethod of making bags
US2387812 *Dec 18, 1941Oct 30, 1945Stokes & Smith CoSystem of producing evacuated packages
US2429482 *Jan 5, 1943Oct 21, 1947Munters Carl GeorgMethod and means for the production of foil material
US2480316 *Nov 11, 1944Aug 30, 1949Mishawaka Rubber & Woolen MfgMethod of making laminated cushion material
US2607712 *Jan 28, 1952Aug 19, 1952Frank W Egan & CompanyExtrusion coating machine
US2609314 *Jan 31, 1951Sep 2, 1952Glenn L Martin CoMachine for making honeycomb core material
US2633442 *Mar 8, 1949Mar 31, 1953Albert E CaldwellMethod of making tufted material
US2642372 *Feb 2, 1950Jun 16, 1953Yardley Chittick CharlesFlexible corrugated sheet material and method of fabricating same
US2670501 *Aug 24, 1951Mar 2, 1954Us Rubber CoMethod of forming plastic material
US2690206 *Mar 23, 1953Sep 28, 1954Marathon CorpExtrusion coating machine
US2759866 *Dec 17, 1952Aug 21, 1956Gen Tire & Rubber CoMethod of making wall covering
US2776452 *Sep 3, 1952Jan 8, 1957Chavannes Ind Synthetics IncApparatus for embossing thermoplastic film
US2778171 *Feb 26, 1953Jan 22, 1957Wilts United Dairies LtdProduction of air-tight packages
US2778173 *Aug 24, 1951Jan 22, 1957Wilts United Dairies LtdMethod of producing airtight packages
US2856323 *Nov 9, 1955Oct 14, 1958Gordon Jack CIndented resilient matted fibrous pad
US2858247 *Aug 4, 1955Oct 28, 1958Swart Dev Company DePanel material
US2916411 *Nov 3, 1955Dec 8, 1959Fiammiferi Ed Affini Spa FabComposite packing paper
US2960144 *May 21, 1958Nov 15, 1960Edwards Eng CorpCorrugating machines
US3026231 *Dec 23, 1957Mar 20, 1962Sealed Air CorpMethod of making an embossed laminated structure
US3077428 *Jun 29, 1956Feb 12, 1963Union Carbide CorpHeat sealable polyethylene laminate and method of making same
US3098563 *Oct 3, 1960Jul 23, 1963Hugh B SkeesInflatable heat insulating material
US3102676 *Dec 28, 1960Sep 3, 1963Montedison SpaSelf-closing containers
US3142599 *Nov 27, 1959Jul 28, 1964Sealed Air CorpMethod for making laminated cushioning material
US3149772 *Dec 4, 1961Sep 22, 1964Technipak Proprietary LtdSelf sealing sachets or containers
US3160323 *Apr 5, 1963Dec 8, 1964Leonard R WeisbergContainers with internal, interlocking protrusions
US3224574 *Jun 10, 1964Dec 21, 1965Scott Paper CoEmbossed plastic bag
US3251463 *Oct 31, 1962May 17, 1966Bodet Jean AugustinPellet package
US3411698 *Sep 9, 1966Nov 19, 1968Reynolds Metals CoBag-like container means
US3423231 *May 20, 1965Jan 21, 1969Ethyl CorpMultilayer polymeric film
US3533548 *Oct 17, 1968Oct 13, 1970Bard Inc C RMethod of ascertaining validity of heat seal and product of said method
US3575781 *May 16, 1969Apr 20, 1971Stauffer Hoechst Polymer CorpPlastic film wrapping material
US3595722 *Apr 2, 1969Jul 27, 1971Thiokol Chemical CorpProcess for forming a thermoplastic product
US3595740 *May 8, 1968Jul 27, 1971Du PontHydrolyzed ethylene/vinyl acetate copolymer as oxygen barrier layer
US3600267 *Apr 14, 1969Aug 17, 1971Dow Chemical CoPackaging film
US3661677 *Oct 10, 1969May 9, 1972Allied ChemPost-heat treatment for polyvinylidene chloride-coated film
US3785111 *Feb 4, 1972Jan 15, 1974Palos Verdes PeninsulaMethod of forming containers and packages
US3809217 *Oct 27, 1970May 7, 1974Franklin Mint CorpPackaging for flat objects
US3908070 *Apr 24, 1972Sep 23, 1975Dow Chemical CoMultilayer thermoplastic barrier structure
US3937395 *Jul 22, 1974Feb 10, 1976British Visqueen LimitedVented bags
US3958391 *Nov 14, 1975May 25, 1976Kabushiki Kaisha Furukawa SeisakushoVacuum packaging method and apparatus
US4104404 *May 24, 1976Aug 1, 1978W. R. Grace & Co.Cross-linked amide/olefin polymeric tubular film coextruded laminates
US4295566 *May 7, 1980Oct 20, 1981Becton, Dickinson And CompanyAir-evacuated package with vacuum integrity indicator means
US4370187 *Dec 18, 1980Jan 25, 1983Mitsui Polychemicals Co. Ltd.Process and apparatus for producing a laminated structure composed of a substrate web and a thermoplastic resin web extrusion-coated thereon
US4449243 *Sep 7, 1982May 15, 1984Cafes ColletVacuum package bag
US4551379 *Aug 31, 1983Nov 5, 1985Kerr Stanley RInflatable packaging material
US4569712 *Sep 2, 1983Feb 11, 1986Sanyo Kokusaku Pulp Co., Ltd.Process for producing support for use in formation of polyurethan films
US4576283 *Jan 25, 1984Mar 18, 1986Bernard FafournouxBag for vacuum packaging of articles
US4579756 *Aug 13, 1984Apr 1, 1986Edgel Rex DInsulation material with vacuum compartments
US4658434 *May 29, 1986Apr 14, 1987Grain Security Foundation Ltd.Laminates and laminated articles
US4672684 *Jan 24, 1986Jun 9, 1987C I L, Inc.Thermoplastic bag
US4683702 *May 23, 1985Aug 4, 1987U.S. Philips CorporationMethod for vacuum-packaging finely divided materials, and a bag for implementing the method
US4756422 *Apr 9, 1987Jul 12, 1988Kristen Hanns JPlastic bag for vacuum sealing
US4834554 *Nov 16, 1987May 30, 1989J. C. Brock Corp.Plastic bag with integral venting structure
US4877334 *Aug 29, 1988Oct 31, 1989Dennis CopeInflatable bag
US4906108 *Mar 8, 1989Mar 6, 1990Mobil Oil CorporationCorrugated sticky tape bag tie closure
US4913561 *Nov 15, 1988Apr 3, 1990Fres-Co System Usa, Inc.Gussetted flexible package with presealed portions and method of making the same
US4917844 *Mar 31, 1988Apr 17, 1990Fuji Photo Film Co., Ltd.Method of manufacturing laminate product
US4941310 *Mar 31, 1989Jul 17, 1990Tillia AktiengesellschaftApparatus for vacuum sealing plastic bags
US4953708 *Aug 23, 1989Sep 4, 1990Fes-Co System Usa, Inc.Flexible package with pour spout and handle
US4973171 *Jul 5, 1989Nov 27, 1990Mobil Oil CorporationClosable plastic bag
US5006056 *Jul 5, 1990Apr 9, 1991The Black Clawson CompanyFilm extrusion apparatus including a quickly replaceable chill roll
US5040904 *Dec 20, 1989Aug 20, 1991Gene D. HoffmanInfectious/medical waste containment carrier
US5097956 *May 9, 1990Mar 24, 1992Paramount Packaging CorporationVacuum package with smooth surface and method of making same
US5098497 *Nov 5, 1990Mar 24, 1992Anthony Industries, Inc.Process for preparing embossed, coated paper
US5106688 *Jun 25, 1991Apr 21, 1992W. R. Grace & Co.-Conn.Multi-layer packaging film and process
US5116444 *May 30, 1991May 26, 1992Sealed Air CorporationApparatus and method for enhancing lamination of plastic films
US5203458 *Mar 2, 1992Apr 20, 1993Quality Containers International, Inc.Cryptoplate disposable surgical garment container
US5240112 *Feb 25, 1992Aug 31, 1993Newburger Bronson EEvacuatable or inflatable plastic bag
US5252379 *Nov 21, 1991Oct 12, 1993Sanyo Kakoshi Kabushiki KaishaEmbossed process paper and production thereof
US5362351 *Jul 9, 1993Nov 8, 1994Karszes William MMethod of making lenticular plastics and products therefrom
US5445275 *Jun 8, 1994Aug 29, 1995Lazy Pet Products, Inc.Full recovery reduced-volume packaging system
US5540500 *Mar 9, 1995Jul 30, 1996Nichimen CorporationCompressive sealed bag for compressible articles such as clothing and the same
US5542902 *May 9, 1995Aug 6, 1996Kapak CorporationVented pouch arrangement and method
US5554423 *Mar 3, 1994Sep 10, 1996Abate; Luigi F.Tubular element for the formation of bags for the vacuum-packing
US5656209 *Dec 27, 1994Aug 12, 1997Roehm Gmbh Chemische FabrikProcess for manufacture of Fresnel lenses
US5665456 *Dec 6, 1995Sep 9, 1997Sealed Air CorporationHeat-shrinkable flexible cushioning material and method of forming the same
US5701996 *Mar 3, 1997Dec 30, 1997Idemitsu Petrochemical Co., Ltd.Snap-fastener bag
US5829884 *Jun 19, 1997Nov 3, 1998Innoflex IncorporatedForm fill and seal package with one-way vent
US5839582 *Dec 30, 1997Nov 24, 1998Strong; William P.Self vacuum storage bag
US5898113 *Jul 30, 1997Apr 27, 1999Bellaire Industries, Inc.Multi-ply material sealed container
US5928762 *Sep 19, 1996Jul 27, 1999Toppan Printing Co., LtdLaminate of a base material and an embossed sheet
US6021624 *Jul 17, 1996Feb 8, 2000Kapak CorporationVented pouch arrangement and method
US6023914 *Apr 22, 1997Feb 15, 2000Kapak CorporationVented pouch arrangement and method
US6074677 *Aug 28, 1998Jun 13, 2000Recot, Inc.Tubular container having vacuum packed inner bag
US6077373 *Aug 5, 1997Jun 20, 2000Du Pont Canada Inc.Manufacture of multilayer polymer films
US6116781 *Aug 13, 1999Sep 12, 2000New West Products, Inc.Storage bag with one-way air valve
US6274181 *Jan 31, 2000Aug 14, 2001Kapak CorporationVented pouch arrangement and method
US6357915 *Jun 25, 2001Mar 19, 2002New West Products, Inc.Storage bag with one-way air valve
US6402873 *Oct 7, 1998Jun 11, 2002Idemitsu Petrochemical Co., Ltd.Method of manufacturing laminated thermoplastic resin sheet and apparatus therefor
US6423356 *Jun 19, 2001Jul 23, 2002Kapak CorporationVented pouch arrangement and method
US20040007494 *Jul 15, 2002Jan 15, 2004Popeil Ronald M.Apparatus and method to more effectively vacuum package foods and other objects
USD320549 *Jul 13, 1989Oct 8, 1991 Carton
USD360578 *Sep 10, 1993Jul 25, 1995 Personal medicine organizer
USRE34929 *Jan 22, 1993May 9, 1995Tilia, Inc.Plastic bag for vacuum sealing
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7490452Jan 11, 2006Feb 17, 2009Unovo, Inc.Method and apparatus for evacuating and sealing containers
US7578320May 4, 2006Aug 25, 2009The Glad Products CompanyFlexible storage bag
US7596930 *Sep 11, 2008Oct 6, 2009The Glad Products CompanyMethod for evacuating a bag
US7726880Jun 29, 2004Jun 1, 2010The Glad Products CompanyFlexible storage bag
US7784160Jun 15, 2007Aug 31, 2010S.C. Johnson & Son, Inc.Pouch and airtight resealable closure mechanism therefor
US7805913Sep 8, 2008Oct 5, 2010Unovo, Inc.Method and apparatus for evacuating and sealing containers
US7857515Jun 15, 2007Dec 28, 2010S.C. Johnson Home Storage, Inc.Airtight closure mechanism for a reclosable pouch
US7874731Jun 15, 2007Jan 25, 2011S.C. Johnson Home Storage, Inc.Valve for a recloseable container
US7886412Mar 16, 2007Feb 15, 2011S.C. Johnson Home Storage, Inc.Pouch and airtight resealable closure mechanism therefor
US7887238Jun 15, 2007Feb 15, 2011S.C. Johnson Home Storage, Inc.Flow channels for a pouch
US7946766Jun 15, 2007May 24, 2011S.C. Johnson & Son, Inc.Offset closure mechanism for a reclosable pouch
US7967509Jun 15, 2007Jun 28, 2011S.C. Johnson & Son, Inc.Pouch with a valve
US8176604Jul 23, 2010May 15, 2012S.C. Johnson & Son, Inc.Pouch and airtight resealable closure mechanism therefor
US8231273Dec 17, 2010Jul 31, 2012S.C. Johnson & Son, Inc.Flow channel profile and a complementary groove for a pouch
US8397958Aug 5, 2010Mar 19, 2013Ds Smith Plastics LimitedClosure valve assembly for a container
US8419279Aug 4, 2009Apr 16, 2013The Glad Products CompanyFlexible storage bag
US8820591Jan 17, 2013Sep 2, 2014Ds Smith Plastics LimitedClosure valve assembly for a container
US8827556Dec 16, 2010Sep 9, 2014S.C. Johnson & Son, Inc.Pouch and airtight resealable closure mechanism therefor
US8973789Mar 31, 2014Mar 10, 2015Ds Smith Plastics LimitedClosure valve assembly for a container
US20050286808 *Jun 29, 2004Dec 29, 2005Zimmerman Dean AFlexible storage bag
US20060193540 *May 4, 2006Aug 31, 2006Borchardt Michael GFlexible Storage Bag
US20070116385 *Feb 6, 2007May 24, 2007The Glad Products CompanyFlexible storage bag
US20070292055 *Aug 14, 2007Dec 20, 2007Reuhs Rebecca SBag with Valve
US20080304771 *Jun 4, 2008Dec 11, 2008Charles HarderVacuum storage bag with zipper
US20090000253 *Sep 11, 2008Jan 1, 2009The Glad Products CompanyFlexible Storage Bag
US20090003736 *Sep 8, 2008Jan 1, 2009Unovo, Inc.Method and apparatus for evacuating and sealing containers
US20090007523 *Sep 8, 2008Jan 8, 2009Unovo, Inc.Method and apparatus for evacuating and sealing containers
US20090290817 *Aug 4, 2009Nov 26, 2009Borchardt Michael GFlexible Storage Bag
US20100177990 *Jul 3, 2008Jul 15, 2010Neltner Andrew EStorage bag
Classifications
U.S. Classification156/210, 156/217
International ClassificationB65D81/20, B65B61/02, B65D33/00, B31B41/00, B65B9/04, B32B3/26
Cooperative ClassificationB65D33/004, B65B61/025, Y10T156/1036, B31B2241/00, Y10T156/1025, B65D81/2023, B32B3/26, B65D33/00, B65D81/2038, B65B9/042
European ClassificationB65D81/20B3, B31B41/00, B32B3/26, B65B9/04B, B65D33/00, B65D33/00E, B65B61/02B
Legal Events
DateCodeEventDescription
Nov 1, 2004ASAssignment
Owner name: TILIA INTERNATIONAL, INC., CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WU, HONGYU;ALBRITTON, CHARLES WADE;BRAKES, DAVID;REEL/FRAME:015943/0744
Effective date: 20041013
Jun 30, 2006ASAssignment
Owner name: TILIA INTERNATIONAL, INC., CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WU, HONGYU;ALBRITTON, CHARLES WADE;BRAKES, DAVID;REEL/FRAME:018072/0293
Effective date: 20041013