WO2009146324A1 - Sac souple avec orifice de libération de pression - Google Patents

Sac souple avec orifice de libération de pression Download PDF

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Publication number
WO2009146324A1
WO2009146324A1 PCT/US2009/045295 US2009045295W WO2009146324A1 WO 2009146324 A1 WO2009146324 A1 WO 2009146324A1 US 2009045295 W US2009045295 W US 2009045295W WO 2009146324 A1 WO2009146324 A1 WO 2009146324A1
Authority
WO
WIPO (PCT)
Prior art keywords
bag
resin
base web
receptacle
recited
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2009/045295
Other languages
English (en)
Inventor
Rusty E. Koenigkramer
David J. Anzini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Illinois Tool Works Inc
Original Assignee
Illinois Tool Works Inc
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 Illinois Tool Works Inc filed Critical Illinois Tool Works Inc
Publication of WO2009146324A1 publication Critical patent/WO2009146324A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
    • 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
    • B65D2205/00—Venting means

Definitions

  • reclosable bags having press-to-close or slide-to- close reclosable feature were designed for food storage applications such as non-refrigerated and refrigerated storage. These bag products were manufactured from a combination of polyethylene resins with a reclosable feature. More recently, such reclosable bag products have been designed for high-temperature applications; for example, they are microwavable.
  • This invention relates to a flexible bag for use in the microwaving of cookable items, and more specifically pertains to the controlled venting of any pressure or steam generated within the bag during microwaving to assure that such is effectively released to the atmosphere.
  • Venting packages work well when the contents are pre-packaged, but in many cases it may be desirable to add ingredients to the package contents just before heating. For example, one may wish to add spices to the package contents prior to heating. There is a need for improvements in reclosable bags or pouches designed for high-temperature applications that will allow ingredients to be added to the package before cooking.
  • One aspect of the invention is a bag comprising a receptacle having a mouth and an interior volume, and a reclosable structure installed in the mouth of the receptacle.
  • the receptacle comprises first and second walls that bound the interior volume and first and second side seal regions that include respective marginal portions of the first and second walls.
  • the reclosable structure comprises first and second zipper strips, the first zipper strip comprising a first base web attached to the first wall and a first closure profile projecting from the first base web, and the second zipper strip comprising a second base web attached to the second wall and a second closure profile projecting from the second base web, the first and second closure profiles being mutually interlockable.
  • a first portion of the first base web is weakly sealed to a first portion of the second base web in a weak seal area of the first side seal region, and a second portion of the first base web is weakly sealed to a second portion of the second base web in a weak seal area of the second side seal region.
  • the first portions of the first and second base webs in the first weak seal area have a seal strength such that the first portions of the first and second base webs will separate from each other, thereby forming a vent, when the pressure inside the interior volume of the receptacle increases to a sufficient level, thereby allowing gas to escape from the interior volume into the ambient atmosphere via the vent during cooking of product contained within the interior volume of the receptacle while the mouth of the receptacle is in a fully closed state.
  • Another aspect of the invention is a bag comprising a receptacle having a mouth and an interior volume, and a reclosable structure installed in the mouth of the receptacle.
  • the receptacle comprises first and second walls that bound the interior volume and first and second side seal regions that include respective marginal portions of the first and second walls.
  • the reclosable structure comprises first and second zipper strips, the first zipper strip comprising a first base web attached to the first wall and a first closure profile projecting from the first base web, and the second zipper strip comprising a second base web attached to the second wall and a second closure profile projecting from the second base web, the first and second closure profiles being mutually interlockable.
  • a first portion of the first base web is not sealed to a first portion of the second base web in a portion of the first side seal region, and a second portion of the first base web is not sealed to a second portion of the second base web in a portion of the second side seal region.
  • the first portions of the first and second base webs form a vent when the pressure inside the interior volume of the receptacle increases to a sufficient level, thereby allowing gas to escape from the interior volume into the ambient atmosphere via the vent during cooking of product contained within the interior volume of the receptacle while the mouth of the receptacle is in a fully closed state.
  • a further aspect of the invention is a bag comprising a receptacle having a mouth and an interior volume, and a reclosable structure installed in the mouth of the receptacle.
  • the receptacle comprises first and second walls that bound the interior volume and first and second side seal regions that include respective marginal portions of the first and second walls.
  • the reclosable structure comprises first and second extruded plastic zipper strips, the first zipper strip comprising a first base web attached to the first wall and a first closure profile projecting from the first base web, and the second zipper strip comprising a second base web attached to the second wall and a second closure profile projecting from the second base web, the first and second closure profiles being mutually interlockable.
  • the first base web Prior to formation of the first and second side seal regions, the first base web comprised a band-shaped surface area which extended the entire length of a face of the first base web, the band- shaped surface area being made of a first resin that forms a weak seal area with an opposing surface area made of a second resin different than said first resin during formation of the first side seal region.
  • FIG. 1 is a drawing showing a plan view of a reclosable bag in accordance with a first embodiment.
  • FIG. 2 is a drawing showing a sectional view of one upper portion of the bag depicted in FIG. 1 , the section being taken along line 2 — 2 seen in FIG. 1.
  • FIG. 3 is a drawing showing a sectional view of another upper portion of the bag depicted in FIG. 1 , the section being taken along line 3 — 3 seen in FIG. 1.
  • FIG. 4 is a drawing showing the same sectional view as that seen in FIG. 3, except that opposing portions of the zipper base webs in a weak seal area are shown in an unsealed and separated state, thereby forming a vent that is in flow communication with the interior volume of the bag.
  • FIG. 5 is a drawing showing a sectional view of a mouth portion of a bag in accordance with a second embodiment.
  • FIG. 6 is a drawing showing a sectional view of a side seal portion of a bag in accordance with the second embodiment.
  • FIG. 7 is a drawing showing the same sectional view as that seen in FIG. 6, except that opposing portions of the zipper base webs in a weak seal area are shown in an unsealed and separated state, thereby forming a vent that is in flow communication with the interior volume of the bag.
  • FIG. 8 is a drawing showing a sectional view of a mouth portion of a bag in accordance with a third embodiment.
  • FIG. 9 is a drawing showing a sectional view of a side seal portion of a bag in accordance with the third embodiment.
  • FIG. 10 is a drawing showing the same sectional view as that seen in FIG. 9, except that opposing unsealed portions of the zipper base webs are shown separated, thereby forming a vent that is in flow communication with the interior volume of the bag.
  • FIG. 11 is a drawing showing a sectional view of a side seal portion of a bag in accordance with a fourth embodiment.
  • Each reclosable bag is made of flexible material, such as polypropylene, plastic lamination films or other high-melting-temperature flexible material.
  • Each reclosable bag has a reclosable structure, e.g., a zipper comprising a pair of extruded plastic zipper strips having mutually interlockable closure profiles.
  • the zipper has a construction which allows the formation of one or more vents for pressure relief during cooking of the bag contents.
  • the vents are located on the product side of the zipper closure profiles at the side edges of the bag.
  • the bag may be constructed with a bottom gusset that enables the bag to stand upright inside a microwave oven.
  • the plastic film used to construct the bag may be thin for single-use bags or thick for multiple-use bags.
  • the reclosable structure remains closed as the pressure inside the bag increases during cooking.
  • the bag and its contents may be placed inside a microwave oven, which oven is then set to cook the bag contents.
  • the pressure buildup inside the bag is relieved by the release of steam through the one or more vents formed in the reclosable bag. The pressure relief prevents the bag from bursting or otherwise having its integrity compromised.
  • FIGS. 1-4 depict one embodiment of a high-temperature reclosable bag suitable for use in cooking food.
  • the bag shown in FIG. 1 comprises a receptacle 2 made of flexible material, such as polypropylene film, plastic lamination film, other higher-melting-temperature material, or a combination of two or more of the foregoing types of flexible material.
  • a web of flexible high-temperature material is folded web to form a front panel 4, a rear panel (not shown in FIG. 1) and a bottom gusset 8 and then heat sealed (or ultrasonically welded) in marginal regions adjacent the top edges and the side edges of the folded web.
  • the side seals are indicated by hatched regions 16 and 18 in FIG. 1.
  • the top seal is not indicated in FIG.
  • the resulting receptacle 2 has an interior volume (not shown) for food product and a mouth in which a reclosable plastic zipper 10 having flanges is installed.
  • the zipper 10 comprises two zipper strips having mutually interlockable closure profiles 22 and 24 projecting from respective base webs 12 and 14 that are joined to the front and rear bag panels (hereinafter "walls") 4 and 6, respectively, as seen in the sectional view presented in FIG. 2.
  • walls front and rear bag panels
  • These base webs are joined to the bag walls by heat sealing or ultrasonic welding and extend across the mouth of the receptacle from one side seal 16 to the other side seal 18 (indicated by hatching in FIG. 1).
  • the construction of the side seals 16 and 18 varies in an elevational direction.
  • the horizontal dashed line 8 which indicates the apex of the bottom gusset
  • respective confronting marginal portions of the front and rear panels of the receptacle are sealed together except where the ends of the base webs of zipper 10 intervene.
  • the ends of the zipper base webs are also joined together in the side seals 16 and 18, with the adjoining marginal portions of the front and rear panels being joined to the fused zipper ends.
  • Below the horizontal dashed line 8 respective marginal portions of the front panel and rear panels of the receptacle and intervening marginal portions of the two panels of the bottom gusset are all sealed together in the side seals 16 and 18.
  • the side seals 16 and 18 also includes respective areas 20 and 20' (located below the closure profiles) where the zipper base webs are weakly sealed together. This can be accomplished by producing a zipper in which each base web has coextruded material on its inside face.
  • FIG. 2 shows a sectional view of an upper portion of the reclosable bag depicted in FIG. 1 , the section being taken along line 2 — 2 seen in FIG. 1 , which is located away from the side seals.
  • the base web 12 has coextruded material 26 on its inside face, while the base web 14 has coextruded material 28 on its inside face. This coextruded material extends along the entire length of each base web.
  • the coextruded materials 26 and 28 may be the same or dissimilar. In either case, the coextruded materials are different than the resin material of the remainder of the zipper (hereinafter "base resin").
  • base resin the resin material of the remainder of the zipper
  • the materials are selected so that when the side seals are formed, e.g., by the application of heat and pressure, the coextruded materials 26 and 28 will form a weak or minimal seal, whereas the base resin of the respective zipper strips will form a strong permanent seal in areas above and below the weak seal.
  • FIG. 3 shows a sectional view of another upper portion of the bag depicted in FIG. 1 , the section being taken along line 3 — 3 seen in FIG. 1 , which is located in side seal region 18.
  • the zipper closure profiles will be substantially deformed, i.e., crushed, in the side seal regions, which crushed profiles become part of the side seal, as seen in FIG. 3.
  • the coextrusion material 26 and 28 is heat sealed and forms a sufficient bond such that the bag is sealed to form a weak seal area in the side seal region below the closure profiles.
  • FIG. 4 shows the same sectional view as that seen in FIG. 3, except that opposing portions of the zipper base webs in weak seal area 20' are shown in an unsealed and separated state, thereby forming a vent 30 that is in flow communication with the interior volume of the bag.
  • the coextruded materials 26 and 28 are disposed on opposing inside faces of the base webs 12 and 14 respectively.
  • Both coextrusions could be a peel seal resin designed to form a peel seal when heat and pressure are applied during bag manufacture and to open later when the bag internal pressure reaches a desired level during cooking.
  • the zipper strips and bag are typically made of polyethylene-based materials. In instances where the bag material is a laminate film, the film surface that the zipper (made of polyethylene-based material) seals to is typically also a polyethylene-based material.
  • Exemplary polyethylene-based materials that could be used as the zipper base resin include, but are not limited to: high-density polyethylene (HDPE); medium-density polyethylene (MDPE); low-density polyethylene (LDPE); linear low-density polyethylene (LLDPE); cyclic olefin copolymers (a commercial example is Ticona's TOPAS resin); and combinations of the foregoing.
  • HDPE high-density polyethylene
  • MDPE medium-density polyethylene
  • LDPE low-density polyethylene
  • LLDPE linear low-density polyethylene
  • cyclic olefin copolymers a commercial example is Ticona's TOPAS resin
  • Polyethylene-based materials that could be used as base resins, but more likely would be used in combination with the base resins identified in the preceding sentence, include, but are not limited to, ultra-low-density polyethylene (ULDPE); very low-density polyethylene (VLDPE); elastomers; plastomers; metallocene-catalyzed polyethylene; and combinations of the foregoing.
  • ULDPE ultra-low-density polyethylene
  • VLDPE very low-density polyethylene
  • elastomers plastomers
  • metallocene-catalyzed polyethylene and combinations of the foregoing.
  • the coextrusions could be a resin that has a higher seal initiation temperature than that of the particular polyethylene-based material from which the zipper is made.
  • examples of such resins include polypropylene-based material or polyester-based material.
  • the coextruded material 26 can be different than the coextruded material 28.
  • coextruded material 26 could be a peel seal resin while coextruded material 28 could be a resin, such as a polypropylene-based material, having a higher seal initiation temperature than that of polyethylene-based material used as the base resin.
  • polypropylene-based materials includes, but is not limited to: polypropylene homopolymers; polypropylene copolymers; ethylene/propylene copolymers; metallocene-catalyzed polypropylene; polypropylene-based elastomers; and combinations of the foregoing.
  • a weak seal area can be formed in each side seal by coextruding a layer 32 material on the inner face of only one of the two base webs of the zipper, e.g., on base web 12 as shown in FIG. 5.
  • the coextrusion 32 could be a peel seal resin or a resin that does not seal well to the particular polyethylene-based base resin, such as a polypropylene-based material.
  • the coextrusion could be a peel seal resin or a resin that does not seal well to the particular polypropylene-based base resin, such as a polyethylene-based material.
  • the coextrusion 32 could be a biodegradable resin such as polylactic acid or a polyhydroxyalkanoate.
  • Typical peel seal resins that could be used are DuPont Appeel 11 D542 and Basell PB8640. Any of the various grades of resin sold for peelable film or lidstock could also be used.
  • a vent can be formed in each side seal by applying a coating 34 of heat- resistant material, such as nitrocellulose, on the inner face of one of the two base webs of the zipper, e.g., on base web 12, as shown in FIG. 8.
  • the heat- resistant coating is preferably applied on the inner face of base web 12 at least in the areas of the side seals.
  • FIG. 9 shows the vent 30 in a closed state
  • FIG. 10 shows the vent 30 in an open state.
  • both base webs can have confronting portions which are coated with a heat-resistant material.
  • the pressure- release area can be located above the closure profiles, i.e., on the consumer side of the profiles rather than on the product side.
  • Such embodiments would have utility in cases where the unopened bag filled with product is sold with the zipper open.
  • the weakly sealed or unsealed area in the side seal could be above or below the closure profiles of the open zipper.
  • Fig. 11 is a sectional view, taken through the side seal, of an embodiment wherein a weak seal area has been formed in the side seal by coextruding a layer 32 material on the inner face of base web 12 at an elevation higher than the elevation of the closure profiles.
  • the coextrusion 32 could be a peel seal resin or a resin that does not seal well to the particular polyethylene-based base resin, such as a polypropylene-based material.
  • the coextrusion could be a peel seal resin or a resin that does not seal well to the particular polypropylene-based base resin, such as a polyethylene-based material.
  • the coextrusion 32 could be a biodegradable resin of a type previously described. Any of the various grades of resin sold for peelable film or lidstock could also be used.
  • a weak seal area or a vent can be formed in a side seal region at the interface of a zipper flange and a confronting portion of the bag wall.
  • the embodiment depicted in FIGS. 5-7 could be altered by placing the coextrusion 32 on the outside face of the lower zipper flange rather than on the inside face.
  • the embodiment depicted in FIGS. 8-10 could be altered by placing the coating 34 on the outside face of the lower zipper flange rather than on the inside face.
  • the embodiment depicted in FIG. 10 could be altered by placing the coextrusion 32 on the outside face of the upper zipper flange rather than on the inside face.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Package Specialized In Special Use (AREA)
  • Bag Frames (AREA)

Abstract

L'invention concerne un sac souple ayant une construction de fermeture à glissière pouvant être refermée dans laquelle un matériau est fourni sur la face intérieure de l'un ou des deux rebords de la fermeture à glissière, ce qui a pour résultat une zone de scellement faible ou une zone sans scellement lorsque que les joints latéraux sont fabriqués. La zone de scellement faible ou la zone sans scellement est positionnée sur le côté produit des profils de la fermeture à glissière (22, 24). Une pression élevée à l'intérieur du sac amènera la zone de scellement faible (20') du joint latéral à échouer tel que prévu ou amènera les rebords de glissière dans la zone sans scellement à se séparer, le résultat étant une action de mise à l'air libre pendant la cuisson du contenu du sac. Par exemple de la vapeur à l'intérieur du sac peut s'échapper à travers l'orifice (30) ou les orifices, lorsque la fermeture à glissière reste fermée. De préférence, le sac a un gousset inférieur (8) afin de pouvoir se tenir verticalement dans un four à micro-ondes. Le sac peut être ouvert pour ajouter un contenu, rescellé et ensuite chauffé.
PCT/US2009/045295 2008-05-28 2009-05-27 Sac souple avec orifice de libération de pression Ceased WO2009146324A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US5669108P 2008-05-28 2008-05-28
US61/056,691 2008-05-28
US12/472,572 2009-05-27
US12/472,572 US20090297071A1 (en) 2008-05-28 2009-05-27 Flexible bag with vent for pressure release

Publications (1)

Publication Number Publication Date
WO2009146324A1 true WO2009146324A1 (fr) 2009-12-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2009/045295 Ceased WO2009146324A1 (fr) 2008-05-28 2009-05-27 Sac souple avec orifice de libération de pression

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US (1) US20090297071A1 (fr)
WO (1) WO2009146324A1 (fr)

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WO2011107727A2 (fr) 2010-03-01 2011-09-09 Planit Products Ltd Sacs auto-adhésifs pour cuisson à la vapeur dans un four à micro-ondes

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