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EP1659070B1 - Packaging with a vent region - Google Patents

Packaging with a vent region Download PDF

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Publication number
EP1659070B1
EP1659070B1 EP04257147A EP04257147A EP1659070B1 EP 1659070 B1 EP1659070 B1 EP 1659070B1 EP 04257147 A EP04257147 A EP 04257147A EP 04257147 A EP04257147 A EP 04257147A EP 1659070 B1 EP1659070 B1 EP 1659070B1
Authority
EP
European Patent Office
Prior art keywords
film
lacquer
packaging
portions
interface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04257147A
Other languages
German (de)
French (fr)
Other versions
EP1659070A1 (en
Inventor
Beth Jones
Andrew Burke
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.)
Amcor Flexibles ApS
Original Assignee
Amcor Flexibles Europe AS
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
Priority to ES04257147T priority Critical patent/ES2273618T3/en
Application filed by Amcor Flexibles Europe AS filed Critical Amcor Flexibles Europe AS
Priority to AT04257147T priority patent/ATE395270T1/en
Priority to PL04257147T priority patent/PL1659070T3/en
Priority to DE602004013797T priority patent/DE602004013797D1/en
Priority to DK04257147T priority patent/DK1659070T3/en
Priority to EP04257147A priority patent/EP1659070B1/en
Priority to SI200430796T priority patent/SI1659070T1/en
Priority to PT04257147T priority patent/PT1659070E/en
Priority to JP2007542088A priority patent/JP2008520510A/en
Priority to CA2588510A priority patent/CA2588510C/en
Priority to AU2005305678A priority patent/AU2005305678B2/en
Priority to BRPI0517755-3A priority patent/BRPI0517755A/en
Priority to ZA200704870A priority patent/ZA200704870B/en
Priority to US11/719,655 priority patent/US20090202756A1/en
Priority to PCT/GB2005/004393 priority patent/WO2006054060A1/en
Priority to NZ555366A priority patent/NZ555366A/en
Publication of EP1659070A1 publication Critical patent/EP1659070A1/en
Application granted granted Critical
Publication of EP1659070B1 publication Critical patent/EP1659070B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B65D33/01—Ventilation or drainage of bags
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1324—Flexible food casing [e.g., sausage type, etc.]

Definitions

  • This invention relates to packaging of the type suitable for use with food stuff to allow the food stuff to be cooked, say in a microwave oven, with the packaging still in place.
  • Packaging of this type must form a sealed enclosure to contain the food stuff and prevent it from becoming contaminated during storage. Also, for convenience, it must be adapted to allow venting of steam from the sealed enclosure as the food stuff is cooked, without having to first pierce the packaging.
  • Various venting arrangements have been provided for microwave packaging including wax plugs, weakened seals and leak paths which all vent at increased temperatures and/or pressures.
  • One such packaging is disclosed in the document US-B-6582123 .
  • An object of the present invention is to provide an improved packaging of the aforesaid type which is especially suitable for fresh foods.
  • packaging comprises polymer film with portions of the film sealed together to form an enclosure for the food stuff, said sealed portions being sealed by a film-to-film seal except in a vent region where a lacquer layer is bonded to each portion of film before said portions are sealed together with the lacquer layers cohering, the seal strength of the lacquer-to-lacquer interface being similar to that of the film-to-film interface under predetermined storage conditions, and the seal strength of said lacquer-to-lacquer interface being reduced compared with that of the film-to-film interface at temperatures above those expected under said predetermined storage conditions so that the enclosure is vented to atmosphere by a cohesive peel action in the vent region between said lacquer layers.
  • the illustrated microwave packaging comprises a sheet 1 of Orientated Polypropylene (OPP) film which is folded on itself to bring together opposite edges which are heat sealed together along a back seal 2 to form a tube.
  • OPP Orientated Polypropylene
  • the lower open end of the tubular sheet is closed by bringing together opposite portions of the lower edge and heat sealing them together to form a lower seal 3.
  • the packaging is then filled with food stuff and the open upper end closed by bringing together opposite portions of the upper edge and heat sealing them together to form an upper seal 4.
  • a portion 5 of the upper seal 4 incorporates a lacquer-to-lacquer interface between the two portions of the sheet 1 so as to form a peelable seal which extends across the full width W of the seal 4.
  • the lacquer is a coating 6 adhering to the inner face of each of the opposite portions of the sheet 1, which may be applied by a gravure or flexo printing process in advance of the sheet being formed into the final enclosure illustrated.
  • the lacquer coating 6 comprises a colourless, coloured or opaque coating made up of resins or cellulose derivatives and a plasticizer in a solvent.
  • the resin comprises a synthetic polymeric compound physically resembling natural resin, such as polyvinyl, polystyrene or epoxy.
  • a preferred example comprises a composition of EVA based resins and a mixture of solvents comprising ethyl acetate, isopropyl acetate and hydrocarbon such as non-aromatic naptha.
  • Such a lacquer is available as "Sovereign Proxseal J9683A" comprising an EVA copolymer dispersed in a solvent mix of ethyl acetate and aliphatic hydrocarbon.
  • the properties of the seals are similar in strength at ambient, chill and freezer temperatures such as apply when the packaging is in use to store food stuff. Also, high humidity conditions caused by the food stuff within the packaging does not adversely affect the strength of the seal under ambient, chill and freezer conditions. High humidity conditions might comprise those up to 100% at 5-8°C, but typical humidity conditions comprise 85% or 95% at 5-8°C.
  • the strength of that portion of the seal 5 incorporating the lacquer coatings 6 is significantly reduced at the elevated temperatures that are generated up to 100°C or above, the strength being only ⁇ 30g/25mm.
  • This reduced strength of the lacquer-to-lacquer seal is such as to allow cohesive peeling, and provides an open vent path between the two portions of the OPP sheet to allow pressurised steam and gases to escape from within the packaging.
  • the strength of the seal where the OPP sheet is sealed face-to-face without the intermediate lacquer coatings remains strong enough to hold the seal closed.
  • venting of the packaging is controlled to occur only in the lacquer coated region 5 of the upper seal 4.
  • the seal strength of the lacquer-to-lacquer is reduced significantly at temperatures of 60°C and above.
  • the size of the lacquered vent region 5 is selected to give an appropriated vent cross-section. If required the vent region 5 could extend the full length of the seal 4. Alternatively, the position of the lacquered region 5 can be varied to suit the particular application and it may be located in one or more of the other seals 2 and 3. Alternatively, multiple vent regions 5 may be provided in one or more of the seams 2, 3, 4.
  • the film may comprise any one of the following: polypropylene, polyethylene, polyester, polyamide, regenerated cellulose, polylactic acid, or combination of any of the preceding.
  • the film may also comprise films with a heat seal coating.
  • the film may be adapted for modified atmosphere packaging by forming microperforations in it which are small enough to control the oxygen/ carbon dioxide gas atmosphere within the bag.
  • the food stuff will have a respiration rate which is matched to the natural permeability of the film and the additional permeability of the microperforations so as to produce the required modified atmosphere within the packaging.
  • the total area of the microperforations would be too small to have any significant effect on the water vapour permeability of the film or the need to provide a separate vent.
  • the lacquer may comprise a water-based EVA lacquer or an epoxy/ acrylic solvent based lacquer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)
  • Package Specialized In Special Use (AREA)
  • Closures For Containers (AREA)

Abstract

Packaging comprises polymer film (1) with portions of the film (1) sealed together to form an enclosure for the food stuff, said sealed portions being sealed by a film-to-film seal except in a vent region (5) where a lacquer layer (6) is bonded to each portion of film before said portions are sealed together with the lacquer layers cohering, the seal strength of the lacquer-to-lacquer interface (6) being similar to that of the film-to-film interface under predetermined storage conditions, and the seal strength of said lacquer-to-lacquer interface (6) being reduced compared with that of the film-to-film interface at temperatures above those expected under said predetermined storage conditions so that the enclosure is vented to atmosphere by a cohesive peel action in the vent region (5) between said lacquer layers (6).

Description

    Technical Field
  • This invention relates to packaging of the type suitable for use with food stuff to allow the food stuff to be cooked, say in a microwave oven, with the packaging still in place.
  • Packaging of this type must form a sealed enclosure to contain the food stuff and prevent it from becoming contaminated during storage. Also, for convenience, it must be adapted to allow venting of steam from the sealed enclosure as the food stuff is cooked, without having to first pierce the packaging. Various venting arrangements have been provided for microwave packaging including wax plugs, weakened seals and leak paths which all vent at increased temperatures and/or pressures. One such packaging is disclosed in the document US-B-6582123 .
  • An object of the present invention is to provide an improved packaging of the aforesaid type which is especially suitable for fresh foods.
    • Disclosure of the Invention
  • According to the invention, packaging comprises polymer film with portions of the film sealed together to form an enclosure for the food stuff, said sealed portions being sealed by a film-to-film seal except in a vent region where a lacquer layer is bonded to each portion of film before said portions are sealed together with the lacquer layers cohering, the seal strength of the lacquer-to-lacquer interface being similar to that of the film-to-film interface under predetermined storage conditions, and the seal strength of said lacquer-to-lacquer interface being reduced compared with that of the film-to-film interface at temperatures above those expected under said predetermined storage conditions so that the enclosure is vented to atmosphere by a cohesive peel action in the vent region between said lacquer layers.
    • Description of the Drawings
  • The invention will be described by way of example with reference to the accompanying drawings in which:
    • Figure 1 illustrates packaging according to the invention;
    • Figure 2 shows a section through a vent seal of the packaging in Figure 1.
    Mode of carrying out the Invention
  • The illustrated microwave packaging comprises a sheet 1 of Orientated Polypropylene (OPP) film which is folded on itself to bring together opposite edges which are heat sealed together along a back seal 2 to form a tube. The lower open end of the tubular sheet is closed by bringing together opposite portions of the lower edge and heat sealing them together to form a lower seal 3. The packaging is then filled with food stuff and the open upper end closed by bringing together opposite portions of the upper edge and heat sealing them together to form an upper seal 4.
  • However, a portion 5 of the upper seal 4 incorporates a lacquer-to-lacquer interface between the two portions of the sheet 1 so as to form a peelable seal which extends across the full width W of the seal 4. The lacquer is a coating 6 adhering to the inner face of each of the opposite portions of the sheet 1, which may be applied by a gravure or flexo printing process in advance of the sheet being formed into the final enclosure illustrated.
  • The lacquer coating 6 comprises a colourless, coloured or opaque coating made up of resins or cellulose derivatives and a plasticizer in a solvent. The resin comprises a synthetic polymeric compound physically resembling natural resin, such as polyvinyl, polystyrene or epoxy. A preferred example comprises a composition of EVA based resins and a mixture of solvents comprising ethyl acetate, isopropyl acetate and hydrocarbon such as non-aromatic naptha. Such a lacquer is available as "Sovereign Proxseal J9683A" comprising an EVA copolymer dispersed in a solvent mix of ethyl acetate and aliphatic hydrocarbon.
  • The properties of the seals, both those portions comprising OPP sheet sealed face-to-face, and those portions which incorporate the layer-to-lacquer interface, are similar in strength at ambient, chill and freezer temperatures such as apply when the packaging is in use to store food stuff. Also, high humidity conditions caused by the food stuff within the packaging does not adversely affect the strength of the seal under ambient, chill and freezer conditions. High humidity conditions might comprise those up to 100% at 5-8°C, but typical humidity conditions comprise 85% or 95% at 5-8°C.
  • However, when the packaging is heated in a microwave oven to cook the food stuff, the strength of that portion of the seal 5 incorporating the lacquer coatings 6 is significantly reduced at the elevated temperatures that are generated up to 100°C or above, the strength being only ~ 30g/25mm. This reduced strength of the lacquer-to-lacquer seal is such as to allow cohesive peeling, and provides an open vent path between the two portions of the OPP sheet to allow pressurised steam and gases to escape from within the packaging. In contrast, the strength of the seal where the OPP sheet is sealed face-to-face without the intermediate lacquer coatings, remains strong enough to hold the seal closed. Thus, venting of the packaging is controlled to occur only in the lacquer coated region 5 of the upper seal 4. Typically, the seal strength of the lacquer-to-lacquer is reduced significantly at temperatures of 60°C and above.
  • The size of the lacquered vent region 5 is selected to give an appropriated vent cross-section. If required the vent region 5 could extend the full length of the seal 4. Alternatively, the position of the lacquered region 5 can be varied to suit the particular application and it may be located in one or more of the other seals 2 and 3. Alternatively, multiple vent regions 5 may be provided in one or more of the seams 2, 3, 4.
  • In alternative embodiments of the invention, the film may comprise any one of the following: polypropylene, polyethylene, polyester, polyamide, regenerated cellulose, polylactic acid, or combination of any of the preceding. The film may also comprise films with a heat seal coating.
  • The film may be adapted for modified atmosphere packaging by forming microperforations in it which are small enough to control the oxygen/ carbon dioxide gas atmosphere within the bag. The food stuff will have a respiration rate which is matched to the natural permeability of the film and the additional permeability of the microperforations so as to produce the required modified atmosphere within the packaging. However, the total area of the microperforations would be too small to have any significant effect on the water vapour permeability of the film or the need to provide a separate vent.
  • Also, in alternative embodiments of the invention, the lacquer may comprise a water-based EVA lacquer or an epoxy/ acrylic solvent based lacquer.

Claims (10)

  1. Packaging for food stuff intended to be heated comprising polymer film (1) with portions of the film sealed together to form an enclosure for the food stuff, characterized in that said sealed portions are sealed by a film-to-film seal except in a vent region (5) where a lacquer layer (6) is bonded to each portion of film before said portions are sealed together with the lacquer layers cohering, the seal strength of the lacquer-to-lacquer interface being similar to that of the film-to-film interface under predetermined storage conditions, and the seal strength of said lacquer-to-lacquer interface being reduced compared with that of the film-to-film interface at temperatures above those expected under said predetermined storage conditions so that the enclosure is vented to atmosphere by a cohesive peel action in the vent region (5) between said lacquer layers (6).
  2. Packaging as claimed in claim 1 in which said enclosure is formed by sealing portions of the film (1) together along multiple seams (2, 3, 4) with a vent region (5) formed in one or more seams (4).
  3. Packaging as claimed in claim 2 in which said enclosure is formed by sealing portions of the film together along multiple seams (2, 3, 4) with said vent region (5) formed along the whole of one seam (4), but not along the whole of the length of all seams (2,3).
  4. Packaging as claimed in any one of the preceding claims in which the lacquer (6) is applied to the film by a gravure or flexo printing process.
  5. Packaging as claimed in any one of the preceding claims in which the film (1) comprises polypropylene, polyethylene, polyester, polyamide, regenerated cellulose, polylactic acid, or combination of any of the preceding.
  6. Packaging as claimed in claim 5 in which the lacquer (6) comprises an EVA based resin.
  7. Packaging as claimed in claim 6 in which the lacquer (6) comprises a combination of solvents comprising alcohols, esters and hydrocarbons.
  8. Packaging as claimed in any one of claims 1 to 5 in which the lacquer (6) comprises a water-based EVA lacquer or an epoxy/acrylic solvent based lacquer.
  9. Packaging as claimed in any one of the preceding claims in which the film (1) is formed with microperforations to support a modified atmosphere within the packaging when it contains respiring food stuff.
  10. Film for the production of packaging of any one of claims 1 to 9 in which at least one region of the film (1) adapted to be incorporated in a packaging seal between two portions of the film is coated with a lacquer (6) comprising an EVA based resin.
EP04257147A 2004-11-18 2004-11-18 Packaging with a vent region Expired - Lifetime EP1659070B1 (en)

Priority Applications (16)

Application Number Priority Date Filing Date Title
AT04257147T ATE395270T1 (en) 2004-11-18 2004-11-18 PACKAGING WITH VENTILATION ZONE
PL04257147T PL1659070T3 (en) 2004-11-18 2004-11-18 Packaging with a vent region
DE602004013797T DE602004013797D1 (en) 2004-11-18 2004-11-18 Packaging with ventilation zone
DK04257147T DK1659070T3 (en) 2004-11-18 2004-11-18 Packing with vent area
EP04257147A EP1659070B1 (en) 2004-11-18 2004-11-18 Packaging with a vent region
SI200430796T SI1659070T1 (en) 2004-11-18 2004-11-18 Packaging with a vent region
PT04257147T PT1659070E (en) 2004-11-18 2004-11-18 Packaging with a vent region
ES04257147T ES2273618T3 (en) 2004-11-18 2004-11-18 PACK WITH VENTILATION AREA.
JP2007542088A JP2008520510A (en) 2004-11-18 2005-11-15 Packaging with hole area
CA2588510A CA2588510C (en) 2004-11-18 2005-11-15 Packaging with a vent region
AU2005305678A AU2005305678B2 (en) 2004-11-18 2005-11-15 Packaging with a vent region
BRPI0517755-3A BRPI0517755A (en) 2004-11-18 2005-11-15 packaging with a ventilation region
ZA200704870A ZA200704870B (en) 2004-11-18 2005-11-15 Packaging with a vent region
US11/719,655 US20090202756A1 (en) 2004-11-18 2005-11-15 Packaging with a Vent Region
PCT/GB2005/004393 WO2006054060A1 (en) 2004-11-18 2005-11-15 Packaging with a vent region
NZ555366A NZ555366A (en) 2004-11-18 2005-11-15 Packaging with a vent region

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04257147A EP1659070B1 (en) 2004-11-18 2004-11-18 Packaging with a vent region

Publications (2)

Publication Number Publication Date
EP1659070A1 EP1659070A1 (en) 2006-05-24
EP1659070B1 true EP1659070B1 (en) 2008-05-14

Family

ID=34930810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04257147A Expired - Lifetime EP1659070B1 (en) 2004-11-18 2004-11-18 Packaging with a vent region

Country Status (16)

Country Link
US (1) US20090202756A1 (en)
EP (1) EP1659070B1 (en)
JP (1) JP2008520510A (en)
AT (1) ATE395270T1 (en)
AU (1) AU2005305678B2 (en)
BR (1) BRPI0517755A (en)
CA (1) CA2588510C (en)
DE (1) DE602004013797D1 (en)
DK (1) DK1659070T3 (en)
ES (1) ES2273618T3 (en)
NZ (1) NZ555366A (en)
PL (1) PL1659070T3 (en)
PT (1) PT1659070E (en)
SI (1) SI1659070T1 (en)
WO (1) WO2006054060A1 (en)
ZA (1) ZA200704870B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006012289U1 (en) * 2006-08-10 2007-12-13 Haver & Boecker Ohg Open sack made of a weldable material
US20140342057A1 (en) * 2007-05-10 2014-11-20 The Hillshire Brands Company Packaging for food product
US20140339105A1 (en) * 2007-05-10 2014-11-20 The Hillshire Brands Company Packaging for food product
US20220332491A1 (en) * 2007-05-10 2022-10-20 The Hillshire Brands Company Moisture degraded packaging seal
US9988200B2 (en) * 2008-05-06 2018-06-05 The Hillshire Brands Company Packaging for food product
MX2013005373A (en) * 2010-11-10 2014-01-31 Hillshire Brands Company Packaging for food product.
CN104014740B (en) * 2014-06-11 2016-08-31 武汉纺织大学 A kind of method improving microwave heating waterglass sand mold resistance to water soak
DE102015223030A1 (en) * 2015-11-23 2017-05-24 Huhtamaki Flexible Packaging Germany Gmbh & Co. Kg Foil packaging with a valve solution integrated in a sealed seam
US10759578B2 (en) 2016-02-24 2020-09-01 Bemis Company, Inc. Multilayer pouch with heat-shrinkable layer
EP3908535A4 (en) * 2019-02-28 2023-01-25 Tecksom International Limited Plastic film and packaging using the plastic film

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3655503A (en) * 1969-01-13 1972-04-11 Crown Zellerbach Corp Package of composite film with peelable, heatsealable surfaces
JP3349573B2 (en) * 1993-12-28 2002-11-25 住友ベークライト株式会社 Edamame package
EP0890521A1 (en) * 1997-07-09 1999-01-13 Daiwa Gravure Co., Ltd. Packaging bag
JPH11139465A (en) * 1997-11-05 1999-05-25 Toppan Printing Co Ltd Package for microwave oven
EP1010519A1 (en) * 1998-12-16 2000-06-21 Alusuisse Technology & Management AG Sterilizable laminated sheet
TW530018B (en) * 2000-01-14 2003-05-01 Tecksom Internat Ltd A package incorporating a pressure venting and sheet of film material and related method of manufacturing the same
FR2838722B1 (en) * 2002-04-22 2004-07-16 Saint Andre Plastique FOOD PACKAGE COMPRISING AT LEAST ONE LOWER STRENGTH SEALING AREA

Also Published As

Publication number Publication date
PL1659070T3 (en) 2008-11-28
EP1659070A1 (en) 2006-05-24
DE602004013797D1 (en) 2008-06-26
WO2006054060A1 (en) 2006-05-26
JP2008520510A (en) 2008-06-19
BRPI0517755A (en) 2008-10-21
DK1659070T3 (en) 2008-09-08
ATE395270T1 (en) 2008-05-15
NZ555366A (en) 2010-02-26
CA2588510A1 (en) 2006-05-26
ES2273618T1 (en) 2007-05-16
AU2005305678A1 (en) 2006-05-26
CA2588510C (en) 2013-05-21
PT1659070E (en) 2008-07-10
US20090202756A1 (en) 2009-08-13
AU2005305678B2 (en) 2011-09-08
ES2273618T3 (en) 2008-09-01
SI1659070T1 (en) 2008-10-31
ZA200704870B (en) 2008-10-29

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