WO2004108556A1 - Valve de liberation pour sac alimentaire - Google Patents

Valve de liberation pour sac alimentaire Download PDF

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Publication number
WO2004108556A1
WO2004108556A1 PCT/US2004/017373 US2004017373W WO2004108556A1 WO 2004108556 A1 WO2004108556 A1 WO 2004108556A1 US 2004017373 W US2004017373 W US 2004017373W WO 2004108556 A1 WO2004108556 A1 WO 2004108556A1
Authority
WO
WIPO (PCT)
Prior art keywords
set forth
vent
bag
layer
adhesive
Prior art date
Application number
PCT/US2004/017373
Other languages
English (en)
Other versions
WO2004108556B1 (fr
Inventor
Richard L. Sandt
William G. Hartman
Original Assignee
Avery Dennison Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Avery Dennison Corporation filed Critical Avery Dennison Corporation
Publication of WO2004108556A1 publication Critical patent/WO2004108556A1/fr
Publication of WO2004108556B1 publication Critical patent/WO2004108556B1/fr
Priority to US11/238,566 priority Critical patent/US7244223B2/en
Priority to US11/758,705 priority patent/US7399263B2/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS 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
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
    • B65D81/20—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas
    • B65D81/2007—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum
    • B65D81/2023—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum in a flexible container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS 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
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/22—Details
    • B65D77/225—Pressure relief-valves incorporated in a container wall, e.g. valves comprising at least one elastic element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/84—Forming or attaching means for filling or dispensing contents, e.g. valves or spouts
    • B31B70/85—Applying patches or flexible valve inserts, e.g. applying film-like valves

Definitions

  • This invention relates generally, as indicated, to a food bag release valve and, more particularly, to a valve for selectively releasing unwanted gas from a food bag.
  • a standard food bag construction comprises a pair of rectangular side panels made from a thermoplastic material and joined together along side seams, a bottom seam, and a top seam.
  • the side and bottom seams usually are permanent seals (e.g., heat sealed) and the top seam can be re-closeable.
  • Freezer burn is, the dehydration that occurs when food is stored in the low humidity atmosphere of a freezer. Freezer burn can cause a complex deterioration of food quality involving undesirable texture changes, followed by chemical changes such as degradation of pigments and oxidative rancidity of lipids. Taste, aroma, mouth feel, and appearance all can be ruined.
  • the present invention provides a release valve for a food bag that supplies sufficient (and possibly superior) freezer-burn protection and can be easily fabricated and incorporated into existing food bag designs.
  • the food bag does not require any special bag constructions, as almost any bag construction can be modified to accommodate the release valve by simply forming an appropriately placed opening.
  • the bag structure and the valve can be manufactured separately, by different manufacturers and at different locations. This allows bag- manufacturers to maintain conventional bag-making techniques and, quite significantly, not compromise current (and quick) bag-making speeds.
  • the bag structures and the valves can be inspected prior to integration whereby a defective valve (or batch) can be scrapped without having to sacrifice an otherwise acceptable bag structure (or run).
  • the flexible manufacturing option provided by the present invention results in lower total costs when compared to, for example, in-line production of both the valve and the bag structure.
  • the present invention provides a release valve for a food bag comprising a vent layer positioned over an opening in the bag structure and a cover layer positioned over the vent layer and attached thereto.
  • the vent layer is pervious with respect to expected gasses and is substantially impervious with respect to expected liquids. In this manner, when pressure is applied to the food bag, unwanted gas therewithin will pass through the vent layer for release from the bag. At the same time, liquids will be prevented from leaking from the bag if saturation and/or strategic squeezing is not performed.
  • a sealable area (having at least a portion aligned with the bag opening) forms a sealed passageway between the vent layer and the bag structure.
  • a baffle area between the vent layer and the cover layer, defines baffle passageways through which released gas can exit. Specifically, the gas passes from the sealable area, through the vent layer, is turned substantially perpendicularly by the cover layer in the baffle area, and exits through the baffle passageways.
  • the sealable area can be formed by an adhesive area (e.g., formed from a pressure-sensitive adhesive) on the inner surface, which can also be used to attach the valve to the bag structure
  • the baffle area can be formed by an adhesive area (e.g., formed from a curable adhesive), which also attaches the cover layer to the vent layer.
  • the periphery of the cover layer does not extend beyond the periphery of the vent layer, and this feature of the invention contributes to efficient and economic integration of the valves into the bag structures.
  • the valves and the bag structures can be manufactured separately at the same, but probably different, locations by the same, but probably different manufacturers.
  • a plurality of the release valves can be provided on a release liner and then selectively removed therefrom for alignment and attachment to the bag structures. The removal, alignment, and/or attachment steps can be performed automatically (i.e., by a machine) or manually (i.e., by a person) depending on the requirements of the bag-manufacturer.
  • the vent layer and the cover layer are of substantially the same shape (e.g., square or circular) and size, and are coextensive with each other, as this contributes to the efficient and economic mass-manufacturing of the valves.
  • a method of making a plurality of the valves can include the steps of overlaying a vent material (e.g., a non-woven polymer fabric) and a cover material (e.g., a polymer film), and cutting (e.g., die-cutting) these overlayed materials into shapes corresponding to the overall shape of the valves.
  • Figure 1 is a front view of a food bag, which incorporates a release valve according to the present invention.
  • Figures 2A - 2D are a front view and sectional views of the release valve.
  • Figures 3A - 3D are a front view and sectional views of a modified form of the release valve.
  • Figures 4A - 4D are a front view and sectional views of another modified form of the release valve.
  • Figures 5A - 5D are schematic views showing a method of using the food bag to store food for later consumption.
  • Figures 6A - 6J are schematic views showing a method of making the food bag according to the present invention.
  • Figure 7 is a schematic view of an adhesive-applying step for the valve shown in Figures 3A - 3D.
  • Figure 8 is a schematic view of an adhesive-applying step for the valve shown in Figures 4A - 4D.
  • a release valve 10 according to the present invention is shown incorporated into a food bag 12.
  • the food bag 12 can be intended for use as a freezer bag (i.e., to store foods intended to be frozen) and, as is explained in more detail below, the valve 10 supplies sufficient (or even superior) freezer-burn protection.
  • the valve 10 can be easily fabricated and incorporated into existing food bag designs and may find application in "non-freezer-bag” applications as it can help improve freshness and/or reduce space.
  • the illustrated food bag 12 has a standard bag construction 13 comprising two side panels 14 and 16, each having a rectangular shape (although other geometries are certainly possible).
  • the panels 14 and 16 can be made from a thermoplastic material or a blend of thermoplastic materials such as, for example, polyolefins such as high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and polypropylene (PP); thermoplastic elastomers such as styrenic block copolymers, polyolefin blends, elastomeric alloys, thermoplastic polyurethanes, thermoplastic copolyesters and thermoplastic polyamides; polymers and copolymers of polyvinyl chloride (PVC); polyvinylidene chloride (PVDC); saran polymers; ethylene/vinyl acetate copolymers; cellulose acetates; polyethylene terephthalate (PET); ionomer (Surlyn); polystyren
  • the panels 14 and 16 are joined together along side seams 18, a bottom seam 20, and a top seam 22.
  • the preferably permanent seams 18 and 20 can be formed by heat sealing or another suitable technique, forming an air-tight union between the panels 14 and 16.
  • the preferably re-closeable seam 22 can constitute, for example, male/female members, zipper-like members, adhesives, hook-and-loop fasteners, mechanical closures, slide locks, draw string arrangements, fold lock tops, magnetic connections, dead fold closures (i.e., aluminum foil, wire folded, tape), heat seals, staples, handle strings, cable ties and/or twist ties.
  • the food bag 12 includes an opening 24 on one of its panels (panel 14 in the illustrated embodiment) for registration with the release valve 10 of the present invention. In the illustrated embodiment, the opening 24 is located roughly centrally relative to the length of the panel 14 and the width of the panel 16.
  • the opening 24 has a circular shape and is positioned centrally relative to the relevant panel 14.
  • other shapes e.g., slits, slots
  • other positions are possible with, and contemplated by, the present invention.
  • the release valve 10 is illustrated as being isolated from the bag structure 12 and, as is best seen in Figure 2A, it has a roughly square shape with semi-circular notches 28 in each side.
  • the overall valve shape can be selected ease and economy in manufacture (e.g., easily mass-produced with minimal waste), handling, and/or installation, and also to optimize venting, baffling, and leak-prevention.
  • the overall and/or notched geometry can be changed if necessary or desired, as long as it does not directly effect the venting, baffling, and/or lead-preventing functions.
  • the valve 10 can instead have a substantially circular and "notchless" shape.
  • the release valve 10 comprises a vent layer 30 and a cover layer 32.
  • the vent layer 30 is the inner layer positioned closest to the bag panel 14 and the cover layer 32 is the outer layer positioned furthest therefrom.
  • the vent layer 30 has an inner surface 34 and an outer surface 36
  • the cover layer 32 has an inner surface 38 and an outer surface 40.
  • the vent layer 30 is made of a material that allows expected gasses to escape from the food bag 12 while preventing the escape of expected liquids.
  • Expected gasses refers to gasses such as air and/or air mixed with gas from contents of the bag structure
  • expected liquids refers to water and/or other liquids from the contents of the bag structure.
  • the vent layer 30 is pervious with respect to the expected gasses while, at the same time, it is substantially impervious to the expected liquids.
  • substantially impervious refers to the material's ability to contain liquids should they casually come into contact therewith, but not necessarily the ability to prevent leakage should the material become saturated, should wicking action occur, and/or should strategic squeezing be performed to create a high pressure force in the vicinity of the opening 24. A balance should be maintained for each particular application between sufficient gas flow capacity and adequate liquid leakage protection.
  • the cover layer 32 serves as a baffle layer that guides escaping gas when pressure is placed on the closed food bag 12. However, a cover layer 32 may not be needed in some applications, as the vent layer 30 alone may perform adequate release valve functions.
  • the cover layer 32 can also serve as a supplemental liquid barrier so that, in combination with the liquid-impervious qualities of the vent layer 30, an increased shield is created.
  • liquid-leakage issues may not be significant in all relevant situations. For example, in situations where food that has already been frozen (e.g., frozen fish, frozen meat, etc.) is being repackaged for future freezing, the containment of liquid from within the bag 12 will not be a concern. In these circumstances, the liquid-imperviousness of the vent layer 30 would be less of a design consideration. Conversely, liquid-leakage issues may play more of a significant role in the desire for the food bag 12 to be compatible with non-freezer applications, such as temporarily storing liquid food substances such as soup or pasta sauce.
  • non-freezer applications such as temporarily storing liquid food substances such as soup or pasta sauce.
  • the size/shape of the layers 30 and 32, and their relative positioning relative to each other, is such that the perimeter (i.e., the periphery) of the cover layer 32 does not extend beyond the perimeter (i.e., the periphery) of the vent layer 30. ( Figures 2B - 2D.)
  • the inner surface 34 of the vent layer 30 can form the entire inner surface, or attachment surface, of the release valve 10.
  • this feature of the invention contributes to efficient and economic integration of the valves 10 into the bag structures 13.
  • the layers 30 and 32 are of substantially the same shape and size, and are substantially aligned with each other.
  • the circumference (i.e., the periphery) of the cover layer 32 does not extend beyond the circumference (i.e., the periphery) of the vent layer 30 and, more particularly, the layers 30 and 32 are of substantially the same circular shape and size, and are substantially aligned with each other.
  • An adhesive area 50 on the inner surface 34 of the vent layer 30 attaches the release valve 10 to the bag structure 13.
  • the adhesive area 50 covers the inner surface 34, except for an adhesive-free area 52 corresponding to the opening 24 in the food bag 12.
  • the adhesive- free area 52 is circular and is sized for close registration with the opening 24 (e.g., % inch diameter).
  • the opening 24 e.g., % inch diameter
  • other shapes mirroring or not mirroring the bag opening 24
  • not-so-precise registration could be used instead.
  • the two-fold purpose of the adhesive area 50 is to attach the vent layer 30 to the bag structure 12 and to seal the central area 52 so that expelled fluid will pass through the vent layer 30 to the area 56 and exit through the baffle passageways 44.
  • any adhesive and/or any adhesive pattern that provides this attaching/sealing could be used.
  • non-adhesive attachments/sealings accomplishing these same goals are possible with, and contemplated by, the present invention.
  • An adhesive area 54 between the outer surface 36 of the vent layer 30 and the inner surface 38 of the cover layer 32 attaches these layers together.
  • the adhesive area 54 comprises four squares occupying each of the four corner sections of the surface 36. ( Figures 2B and 2D.)
  • any adhesive or non-adhesive arrangement which provides such attaching is possible with, and contemplated by, the present invention.
  • the adhesive-free area 56 between the vent layer 30 and the cover layer 32 extends to side edge portions of the valve 10, whereby the traverse baffling passageways 44 are formed for the escaping gas.
  • gas flow traveling through the portion of the vent layer 30 that is aligned with the bag opening 24 (and/or the adhesive-free area 52) will be turned perpendicularly by the cover layer 32 and released through the baffling passageways 44 between the layers 30 and 32.
  • the notches 28 help to insure a cross-shaped release of gas, thereby equalizing exhaust forces and not straining the valve-to-bag attachment.
  • the adhesive area 54 comprises four semi-circles equally spaced about the circle's circumference.
  • the adhesive area 54 comprises two strips running through opposite side arcs of the circle.
  • the illustrated bag 12 can be used by a consumer, in a home setting, to store food for freezing.
  • food F is placed in the bag structure 13 and the top seam 22 is closed.
  • Pressure is then applied to the bag structure 13 (e.g. by manually pushing or squeezing the bag structure 13) at a location lower than the release valve 10.
  • Gas e.g. air
  • Within the bag structure 13 then passes through the opening 24, through the vent layer 30, and released through the baffling passageways 44 between the layers 30 and 32.
  • FIG. 5D a method for mass-manufacturing a plurality of the food bags 12 according to the present invention is schematically shown.
  • a plurality of the valves 10 is manufactured, a plurality of the bag structures 13 is manufactured separately and in a conventional manner, and the valves 10 are integrated into the structures 13 during the latter stages of bag production. While the illustrated schematic steps are shown with respect to a single row of valves 10 and/or bag structures 13, these steps can, of course, be performed simultaneously or intermittently to a plurality of rows for mass production purposes.
  • a continuous web of cover material 60 is provided having an inner surface 62 and an outer surface 64.
  • Figure 6A. A commercial indication, a name brand, a logo or other labeling indicia 66 is printed on the outer surface 64.
  • Figure 6B An adhesive 68 is applied (e.g., printed) on the inner surface 62 of the cover material 60 in a pattern corresponding to the adhesive areas 54.
  • Figure 6C. A continuous web of a vent material 70 having an inner surface 72 and an outer surface 74 is then positioned so that its outer surface 74 is adjacent the inner surface 62 of the cover material 60, whereby the adhesive 68 is positioned therebetween.
  • Figure 6D. A continuous web of a vent material 70 having an inner surface 72 and an outer surface 74 is then positioned so that its outer surface 74 is adjacent the inner surface 62 of the cover material 60, whereby the adhesive 68 is positioned therebetween.
  • An adhesive 76 is applied (e.g., printed) to the inner surface 72 of the vent material 70 in a pattern corresponding to the adhesive areas 50 in the valves 10.
  • a release liner 78 is positioned over the inner surface 72 of the vent material 70 so that the adhesive 76 is positioned therebetween.
  • the compilation of materials 60 and 70 is then die cut into squares corresponding to the overall shape of the valves 10 and, preferably simultaneously, cut to form the notches 28.
  • Figure 6G. The cuts do not extend through the release liner 78 whereby a web 80 comprising a plurality of the valves 10 temporarily attached to the release liner 78 (via the adhesive 76 or the adhesive area 50) is produced.
  • the web 80 can be shipped from the valve-manufacturing location to the bag- manufacturing location in, for example, roll form.
  • the bag structures 13 are separately mass-manufactured in a continuous strip wherein the bottom seam 20 of one bag structure 13 abuts against the top seam 22 of the adjacent downstream bag structure 13. ( Figure 61).
  • the valves 10 can be removed from the release liner 78, aligned with the openings 24 and secured to the bag structures 13 ( Figure 6J).
  • the removal, aligning, and securing step can be performed automatically (i.e., by a machine, not shown) or can be performed manually (i.e., by a person, not shown).
  • the bag structures 13 are separated from each other by a severing device (not shown), either before or after the valve- securing step.
  • the present invention allows the bag structure 13 and the valve 10 to be manufactured as separate articles and integrated together during final production stages.
  • This allows the bag structure 13 to be made in a conventional (and quick and proven cost-effective) manner whereby the integration of the valve 10 does not significantly affect the bag-making process.
  • the valves 10 can be inspected prior to integration whereby potentially defective items can be pulled from the process without having to scrap entire otherwise acceptable bag structures 13.
  • the bag structures 13 can be inspected prior to integration to avoid the scraping otherwise acceptable valves 10, however, the cost of the bag structure 13 will usually greatly outweigh the cost of the valve 10.
  • the flexible manufacturing option provided by the present invention results in lower total costs when compared to, for example, in-line production of both the valve and the bag structure.
  • the cover material 60 (and thus the cover layer 32) can be made from polymer film materials such as polystyrenes, polyolefins, polyamides, polyesters, polycarbonates, poiyvinyl alcohol, poly(ethylene vinyl alcohol), polyurethanes, polyacrylates including copolymers of olefins such as ethylene and propylene with acrylic acids and esters, copolymers of olefins and vinyl acetate, ionomers and mixtures thereof.
  • polymer film materials such as polystyrenes, polyolefins, polyamides, polyesters, polycarbonates, poiyvinyl alcohol, poly(ethylene vinyl alcohol), polyurethanes, polyacrylates including copolymers of olefins such as ethylene and propylene with acrylic acids and esters, copolymers of olefins and vinyl acetate, ionomers and mixtures thereof.
  • polymer film materials such as polystyrenes, polyolefin
  • the vent material 70 (and thus the layer 30) can be made from nylon, polyolefins (e.g., polyethylene, polypropylene, ethylene butylene copolymers), polyurethanes, polyurethane foams, polystyrenes, plasticized polyvinylchlorides, polyesters, polyamides, cotton, or rayon.
  • the vent material can be woven, non- woven, knitted and/or an aperatured (or perforated) film.
  • the material used to fabricate the vent layer 30 should have a porosity or perviousness of at least about 5 cfm (cubic feet per minute), at least about 10 cfm, at least about 15 cfm, at least about 20 cfm and/or at least about 25 cfm with respect to air so that an acceptable level of gas flow can be obtained without the placement of excessive pressure on the bag.
  • the adhesive 68 (and thus the adhesive area 54) can be any suitable adhesive, such as a pressure-sensitive adhesive (e.g., acrylic-based, rubber-based, or silicone-based) or a curable-adhesive, such as a UV-curable adhesive. (It may be noted that if a UV-curable adhesive is used for the adhesive 76, the cover material 68 may need to be transparent.)
  • a pressure-sensitive adhesive e.g., acrylic-based, rubber-based, or silicone-based
  • a curable-adhesive such as a UV-curable adhesive.
  • the adhesive 76 (and thus the adhesive area 50) can be any suitable adhesive, such as a pressure-sensitive adhesive (e.g., acrylic-based, rubber-based, or silicone-based) and, more particularly, a hot melt pressure-sensitive adhesive.
  • the release liner 78 can be a sheet of paper or polymeric film having a release coating, such as a silicone release coating.
  • the vent layer 30, the cover layer 32, the adhesive 50, the adhesive 54, and/or the release liner 78 may stem from the potential food-related use of the food bag 12.
  • the FDA may dictate that only certain materials and/or adhesives can be used when the possibility of food contact exists.
  • the materials should be able to remain intact at the expected freezing temperatures.
  • an important consideration might be whether the valves 10 will be automatically or manually attached to the bag structures 13.
  • the present invention provides a release valve 10 that provides sufficient (or even superior) freezer-burn protection and can be easily fabricated and incorporated into existing food bag designs. Unlike prior art attempts to address the problem of freezer burn, the present invention does not require any special bag constructions and/or closing means. In fact, almost any food bag construction can be modified to accommodate the release valve of the present invention by simply forming the opening 24 in the appropriate place. Morever, the release valve 10 need not be used solely in food bags, but could find application in any flexible packaging container (for perishable and/or non-perishable items) wherein venting is necessary or desired. Additionally or alternatively, the venting action can be accomplished by the application of external pressure (e.g., a compressible portion of the package is pushed) or by increased internal pressure (e.g., increased temperatures or chemical reactions causing the pressure within the container to elevate).
  • external pressure e.g., a compressible portion of the package is pushed
  • increased internal pressure e.g., increased temperatures or chemical reactions causing the pressure within the container

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Packages (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne une valve de libération (10) destinée à un sac alimentaire (12) comprenant une couche de ventilation (30) et une couche de couverture (32). La couche de ventilation (30) est positionnée sur une ouverture (24) ménagée dans la structure (13) du sac alimentaire (12) et la couche de couverture (32) est positionnée sur la couche de ventilation (30) à laquelle elle est fixée. Une zone scellable (52) forme un passage hermétique entre la structure de sac (13) et la couche de ventilation (30), et une zone de déflexion (56) forme des passages de déflexion (44) entre la couche de ventilation (30) et la couche de couverture (32).
PCT/US2004/017373 2003-05-30 2004-06-01 Valve de liberation pour sac alimentaire WO2004108556A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US11/238,566 US7244223B2 (en) 2003-05-30 2005-09-29 Food bag release valve
US11/758,705 US7399263B2 (en) 2003-05-30 2007-06-06 Food bag release valve

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US47473503P 2003-05-30 2003-05-30
US60/474,735 2003-05-30
US51679103P 2003-11-03 2003-11-03
US60/516,791 2003-11-03

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US11/238,566 Continuation US7244223B2 (en) 2003-05-30 2005-09-29 Food bag release valve
US11/758,705 Continuation US7399263B2 (en) 2003-05-30 2007-06-06 Food bag release valve

Publications (2)

Publication Number Publication Date
WO2004108556A1 true WO2004108556A1 (fr) 2004-12-16
WO2004108556B1 WO2004108556B1 (fr) 2005-03-03

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Family Applications (3)

Application Number Title Priority Date Filing Date
PCT/US2004/017145 WO2005000706A1 (fr) 2003-05-30 2004-06-01 Valve d'evacuation pour sac alimentaire
PCT/US2004/017373 WO2004108556A1 (fr) 2003-05-30 2004-06-01 Valve de liberation pour sac alimentaire
PCT/US2004/017385 WO2004108557A2 (fr) 2003-05-30 2004-06-01 Vanne de vidange pour sac a aliments

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/US2004/017145 WO2005000706A1 (fr) 2003-05-30 2004-06-01 Valve d'evacuation pour sac alimentaire

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/US2004/017385 WO2004108557A2 (fr) 2003-05-30 2004-06-01 Vanne de vidange pour sac a aliments

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WO2019077536A1 (fr) * 2017-10-20 2019-04-25 Masterpack S.P.A. Valve adhésive, feuille et récipient alimentaire, support ainsi que procédé de fabrication de cette valve adhésive
IT201800003120A1 (it) * 2018-02-28 2019-08-28 Masterpack S P A Valvola adesiva, foglio e contenitore per alimenti, nonché procedimento per fabbricare questa valvola adesiva o foglio
IT201700119051A1 (it) * 2017-10-20 2019-04-20 Masterpack S P A Valvola adesiva, foglio e contenitore per alimenti, nonché procedimento per fabbricare questa valvola adesiva o foglio
KR102040443B1 (ko) * 2019-06-03 2019-11-04 소윤섭 포장재용 가스 배출밸브

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US5445870A (en) * 1992-12-18 1995-08-29 Robert Bosch Gmbh Method of producing overpressure valve for packaging containers
US5989608A (en) * 1998-07-15 1999-11-23 Mizuno; Maki Food container for cooking with microwave oven
US20030035597A1 (en) * 2001-06-21 2003-02-20 Robert Buckingham Pressure sensitive one-way valve

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DE3411371A1 (de) * 1984-03-28 1985-10-10 Robert Bosch Gmbh, 7000 Stuttgart Verpackungsbehaelter mit ueberdruckventil
DE3521373A1 (de) * 1985-06-14 1986-12-18 Heinrich Hermann Gmbh + Co, 7000 Stuttgart Ueberdruckventil fuer einen verpackungsbehaelter, insbesondere aus flexiblem werkstoff und dessen herstellungsverfahren
US5445870A (en) * 1992-12-18 1995-08-29 Robert Bosch Gmbh Method of producing overpressure valve for packaging containers
US5989608A (en) * 1998-07-15 1999-11-23 Mizuno; Maki Food container for cooking with microwave oven
US20030035597A1 (en) * 2001-06-21 2003-02-20 Robert Buckingham Pressure sensitive one-way valve

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WO2004108557B1 (fr) 2005-08-25
WO2004108556B1 (fr) 2005-03-03
WO2004108557A2 (fr) 2004-12-16
WO2004108557A3 (fr) 2005-06-30
WO2005000706A1 (fr) 2005-01-06
WO2005000706B1 (fr) 2005-02-17

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