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WO2006054060A1 - Packaging with a vent region - Google Patents

Packaging with a vent region Download PDF

Info

Publication number
WO2006054060A1
WO2006054060A1 PCT/GB2005/004393 GB2005004393W WO2006054060A1 WO 2006054060 A1 WO2006054060 A1 WO 2006054060A1 GB 2005004393 W GB2005004393 W GB 2005004393W WO 2006054060 A1 WO2006054060 A1 WO 2006054060A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
lacquer
packaging
portions
interface
Prior art date
Application number
PCT/GB2005/004393
Other languages
French (fr)
Inventor
Beth Jones
Andrew Burke
Original Assignee
Amcor Flexibles Europe A/S
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 Amcor Flexibles Europe A/S filed Critical Amcor Flexibles Europe A/S
Priority to JP2007542088A priority Critical patent/JP2008520510A/en
Priority to AU2005305678A priority patent/AU2005305678B2/en
Priority to CA2588510A priority patent/CA2588510C/en
Priority to BRPI0517755-3A priority patent/BRPI0517755A/en
Priority to US11/719,655 priority patent/US20090202756A1/en
Priority to NZ555366A priority patent/NZ555366A/en
Publication of WO2006054060A1 publication Critical patent/WO2006054060A1/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
    • 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.
  • 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-f ⁇ lm 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.
  • Figure 1 illustrates packaging according to the invention
  • Figure 2 shows a section through a vent seal of the packaging in Figure 1.
  • 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 0 C, but typical humidity conditions comprise 85% or 95% at 5-8 0 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 0 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

PACKAGING WITH A VENT REGION
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.
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-fϊlm 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 5-80C, but typical humidity conditions comprise 85% or 95% at 5-80C.
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 600C 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

Claims
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, 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 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.
PCT/GB2005/004393 2004-11-18 2005-11-15 Packaging with a vent region WO2006054060A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2007542088A JP2008520510A (en) 2004-11-18 2005-11-15 Packaging with hole area
AU2005305678A AU2005305678B2 (en) 2004-11-18 2005-11-15 Packaging with a vent region
CA2588510A CA2588510C (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
US11/719,655 US20090202756A1 (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 (2)

Application Number Priority Date Filing Date Title
EP04257147A EP1659070B1 (en) 2004-11-18 2004-11-18 Packaging with a vent region
EP04257147.1 2004-11-18

Publications (1)

Publication Number Publication Date
WO2006054060A1 true WO2006054060A1 (en) 2006-05-26

Family

ID=34930810

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/004393 WO2006054060A1 (en) 2004-11-18 2005-11-15 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140342057A1 (en) * 2007-05-10 2014-11-20 The Hillshire Brands Company Packaging for food product

Families Citing this family (9)

* 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
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1292583A (en) * 1969-01-13 1972-10-11 Crown Zellerbach Corp Package of composite film with peelable, heat sealable surfaces
EP0890521A1 (en) * 1997-07-09 1999-01-13 Daiwa Gravure Co., Ltd. Packaging bag
US20010031348A1 (en) * 1998-12-16 2001-10-18 Wilfried Jud Sterilisible composite film
US6582123B1 (en) * 2000-01-14 2003-06-24 Tecksom International Limited Package incorporating a pressure venting feature

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3349573B2 (en) * 1993-12-28 2002-11-25 住友ベークライト株式会社 Edamame package
JPH11139465A (en) * 1997-11-05 1999-05-25 Toppan Printing Co Ltd Package for microwave oven
FR2838722B1 (en) * 2002-04-22 2004-07-16 Saint Andre Plastique FOOD PACKAGE COMPRISING AT LEAST ONE LOWER STRENGTH SEALING AREA

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1292583A (en) * 1969-01-13 1972-10-11 Crown Zellerbach Corp Package of composite film with peelable, heat sealable surfaces
EP0890521A1 (en) * 1997-07-09 1999-01-13 Daiwa Gravure Co., Ltd. Packaging bag
US20010031348A1 (en) * 1998-12-16 2001-10-18 Wilfried Jud Sterilisible composite film
US6582123B1 (en) * 2000-01-14 2003-06-24 Tecksom International Limited Package incorporating a pressure venting feature

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140342057A1 (en) * 2007-05-10 2014-11-20 The Hillshire Brands Company Packaging for food product

Also Published As

Publication number Publication date
PL1659070T3 (en) 2008-11-28
EP1659070B1 (en) 2008-05-14
EP1659070A1 (en) 2006-05-24
DE602004013797D1 (en) 2008-06-26
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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