WO2004035406A1 - Inner and outer bags for packaging meat products - Google Patents

Inner and outer bags for packaging meat products Download PDF

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Publication number
WO2004035406A1
WO2004035406A1 PCT/AU2003/001367 AU0301367W WO2004035406A1 WO 2004035406 A1 WO2004035406 A1 WO 2004035406A1 AU 0301367 W AU0301367 W AU 0301367W WO 2004035406 A1 WO2004035406 A1 WO 2004035406A1
Authority
WO
WIPO (PCT)
Prior art keywords
bag
packing
heat
sealed
outer bag
Prior art date
Application number
PCT/AU2003/001367
Other languages
French (fr)
Inventor
Martin Evans
Jeremy West
Original Assignee
Martin Evans
Jeremy West
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 Martin Evans, Jeremy West filed Critical Martin Evans
Priority to AU2003277942A priority Critical patent/AU2003277942A1/en
Publication of WO2004035406A1 publication Critical patent/WO2004035406A1/en

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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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/04—Bags or like containers made of paper and having structural provision for thickness of contents with multiple walls
    • 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
    • B31B2155/00—Flexible containers made from webs
    • 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
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/002—Flexible containers made from webs by joining superimposed webs, e.g. with separate bottom webs
    • 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
    • B31B2170/00—Construction of flexible containers
    • B31B2170/20—Construction of flexible containers having multi-layered walls, e.g. laminated or lined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B25/00—Packaging other articles presenting special problems
    • B65B25/06—Packaging slices or specially-shaped pieces of meat, cheese, or other plastic or tacky products
    • B65B25/065—Packaging slices or specially-shaped pieces of meat, cheese, or other plastic or tacky products of meat

Definitions

  • This invention relates to improvements in bags for packaging and relates particularly to an improved bag for packaging products having a structure, which may cause damage to the packaging.
  • the invention is particularly developed for packaging meat products, although it will be appreciated that the invention may be utilized for packaging other products where sharp surfaces or edges of the product may cause package damage.
  • a packing bag comprising an outer bag formed by heat sealing a sealable, synthetic film into a bag shape having one open end, one closed end and two side edges, an inner, protective bag sealed about three edges to the sealed end and side edges of the outer bag, the inner bag having a length less than that of the outer bag so that its free end is spaced from the open end of the outer bag, and means sealing the said free end edge portions to the outer bag.
  • the inner bag and the outer bag are adhered together by heat and/or pressure and /or a suitable adhesive.
  • edges of the inner and outer bags are sealed together during an initial manufacturing process and that the process of heat sealing the free end and edge portions of the inner bag to the outer bag occurs either during the bag making step, or subsequently.
  • the outer bag is formed of a low oxygen transmission synthetic plastic film to restrict oxygen contact with the product sealed within the packing bag.
  • a protective inner bag which is sealed by the vacuum sealing of the packing bag, the contents of the packing bag are physically protected as well as being protected against contamination by contact with the atmosphere.
  • the protective inner bag is thermally laminated to the material of the outer bag prior to forming the bag.
  • the edge seal about the perimeter of the formed bag sealed to the edges of the protective inner bag material without necessarily incorporating the material within the heat seal.
  • the edges of the inner protective bag may be secured to the edges of the outer bag by adhesive and then by the perimeter edge seals.
  • the provision of the unprotected open end of the outer bag enables the outer bag to be easily and quickly heat sealed in a meat packing operation without the need to heat seal the protective inner bag, which is of a different plastics material and which requires a relatively high temperature for heat sealing.
  • the use of the unprotected outer end ensures relatively quick and easy handling of the sealing operation of a bag containing product.
  • the seal between the outer edge of the protective bag and the outer bag material prevents intrusion of any material between the respective films, particularly when material being packed is being inserted into the bag.
  • the sealed edge also ensures that, when the outer bag is vacuum-sealed, it is heat sealed immediately adjacent to the sealed edges to ensure that there is no likelihood of product causing damage to the outer bag.
  • Figure 1 illustrates one form of a packing bag in accordance with an embodiment of the invention
  • Figure 2 is a schematic, cross sectional view of the bag of figure 1;
  • FIG. 3 is a view similar to figure 2 but illustrating a further embodiment of the invention.
  • a meatpacking bag 10 is formed of an outer, sealable bag 12 comprising a synthetic plastic film having low oxygen transmission properties.
  • a synthetic plastics film is well known in the art and does not form part of this invention.
  • the low oxygen transmission film may comprise a film formed of seven layers including outer layers of low density polyethylene, inner layers of nylon, tie layers by which the polyethylene is laminated to the Nylon and an inner layer of low oxygen transmitting, ethylene vinyl alcohol polymer.
  • Such films are heat sealable and may be used for the packaging of meat and similar products to reduce oxygen contamination which may lead to spoilage.
  • An inner, protective bag 14 formed of a relatively strong, relatively thick synthetic plastic film.
  • the end and side edges of the outer bag 12 are heat sealed together with the edges of the inner protective bag there between, as shown in Figure 2.
  • the bag thus formed has a closed end 16, two side edges 17 and 18 and open end 19.
  • the end of the inner bag is spaced from the open end 19 which facilitates sealing of a packing bag when loaded with product.
  • the relatively thick protective bag while heat sealable, requires substantial heat which takes a significant period of time. Accordingly, it is far more efficient to seal only the outer bag which seals at a relatively low temperature and relatively more quickly.
  • the protective inner bag may be a multilayer bag formed of polyethylene and incorporating an outside tacky layer, a middle layer of bimodal, which is a tough polymer and provides substantial strength to the bag, and a third, relatively cheap, linear low density polyethylene. Such material is known in the art and does not constitute part of this invention.
  • the outer edges of the inner bag 14 are preferably sealed to the outer bag 12 along sealing lines 21 adjacent or on the edges. Such sealing lines ensure that no material can be mistakenly inserted between the inner and outer bags.
  • the protective film is physically located on the inside of the bag so that any product within the bag is protected against oxygen transmission by the outer, lower oxygen transmission film.
  • the inner bag is held in position by the edge seals.
  • the inner bag material may be laminated to the outer bag material by an adhesive and/or heat/and or pressure prior to bag manufacture to facilitate material handling.
  • the bag may be formed by folding rather than end or side edge sealing, although even with a folding technique, the edge may be sealed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)

Abstract

A packing bag (10) comprising an outer bag (12) made of low oxygen synthetic plastic film that contains an inner protective bag (14) of relatively strong and thick synthetic plastic film. The packing bag is closed by vacuum sealing or heat sealing or gas flushed then heat sealed to protect the contents such as meat products with a bone having sharp surfaces or edges from damage and against contamination by contact with the atmosphere. The inner bag and outer bag are adhered together by heat and/or pressure and/or a suitable adhesive. The inner bag has a length less than the outer bag. The different bag lengths enables the outer bag to be easily and quickly sealed in a meat packing operation without the need to heat seal the inner bag which is of a different plastics material and which requires a relatively high temperature for heat sealing.

Description

INNER AND OUTER BAGS FOR PACKAGING MEAT PRODUCTS
This invention relates to improvements in bags for packaging and relates particularly to an improved bag for packaging products having a structure, which may cause damage to the packaging.
The invention is particularly developed for packaging meat products, although it will be appreciated that the invention may be utilized for packaging other products where sharp surfaces or edges of the product may cause package damage.
In the meat packaging industry, it is common practice to package meats in vacuum-sealed synthetic plastic bags. Such bags are commonly formed of multi-layered synthetic plastic film designed to restrict oxygen contacting the product within the bag. However, if the product, such as meat, includes bone, the bone readily causes damage to the packaging and thus spoilage of the product occurs. Spoilage of a product can result in significant cost to the processor either through direct loss costs or through costs of repackaging.
It has been proposed to obviate the problem by providing a protective patch applied to the outer surface of the packing bag. However, such patches have met with limited success. One shortcoming is that the protective material does not cover the packing bag to the very edges and, particularly, to the very bottom seal of the packing bag. This increases the likelihood of damage to an unprotected area of the packing bag. Further, the fact that the protective material is positioned on the outside of the packing bag can also permit a puncture to occur in the packing bag, which can result in the spoilage of the packaged product.
It is therefore desirable to provide an improved packaging which avoids disadvantages associated with existing packaging, particularly of meat products.
It is also desirable to provide an improved packing bag which is relatively simple and economical to manufacture and which is easy to use.
It is also desirable to provide a bag for packaging meat products containing bone material, which minimises spoilage, caused by damage to the packaging by the bone material. It is also desirable to provide an improved packing bag for meat products, which can be heat sealed or vacuum-sealed, or gas flushed then heat-sealed.
According to one aspect of the present invention there is provided a packing bag comprising an outer bag formed by heat sealing a sealable, synthetic film into a bag shape having one open end, one closed end and two side edges, an inner, protective bag sealed about three edges to the sealed end and side edges of the outer bag, the inner bag having a length less than that of the outer bag so that its free end is spaced from the open end of the outer bag, and means sealing the said free end edge portions to the outer bag.
Preferably, the inner bag and the outer bag are adhered together by heat and/or pressure and /or a suitable adhesive.
It is also preferred that the edges of the inner and outer bags are sealed together during an initial manufacturing process and that the process of heat sealing the free end and edge portions of the inner bag to the outer bag occurs either during the bag making step, or subsequently.
In a preferred form of the invention, the outer bag is formed of a low oxygen transmission synthetic plastic film to restrict oxygen contact with the product sealed within the packing bag. By providing a protective inner bag, which is sealed by the vacuum sealing of the packing bag, the contents of the packing bag are physically protected as well as being protected against contamination by contact with the atmosphere. In another embodiment of the invention, the protective inner bag is thermally laminated to the material of the outer bag prior to forming the bag. In this embodiment, the edge seal about the perimeter of the formed bag sealed to the edges of the protective inner bag material without necessarily incorporating the material within the heat seal. In a further alternative embodiment, the edges of the inner protective bag may be secured to the edges of the outer bag by adhesive and then by the perimeter edge seals.
The provision of the unprotected open end of the outer bag enables the outer bag to be easily and quickly heat sealed in a meat packing operation without the need to heat seal the protective inner bag, which is of a different plastics material and which requires a relatively high temperature for heat sealing. Thus, the use of the unprotected outer end ensures relatively quick and easy handling of the sealing operation of a bag containing product.
The seal between the outer edge of the protective bag and the outer bag material prevents intrusion of any material between the respective films, particularly when material being packed is being inserted into the bag. The sealed edge also ensures that, when the outer bag is vacuum-sealed, it is heat sealed immediately adjacent to the sealed edges to ensure that there is no likelihood of product causing damage to the outer bag.
In order that the invention is more readily understood, an embodiment thereof will now be described with reference to the accompanying drawing where:
Figure 1 illustrates one form of a packing bag in accordance with an embodiment of the invention;
Figure 2 is a schematic, cross sectional view of the bag of figure 1; and
Figure 3 is a view similar to figure 2 but illustrating a further embodiment of the invention. Referring to figures 1 and 2, a meatpacking bag 10 is formed of an outer, sealable bag 12 comprising a synthetic plastic film having low oxygen transmission properties. Such a synthetic plastics film is well known in the art and does not form part of this invention. The low oxygen transmission film may comprise a film formed of seven layers including outer layers of low density polyethylene, inner layers of nylon, tie layers by which the polyethylene is laminated to the Nylon and an inner layer of low oxygen transmitting, ethylene vinyl alcohol polymer. Such films are heat sealable and may be used for the packaging of meat and similar products to reduce oxygen contamination which may lead to spoilage.
An inner, protective bag 14 formed of a relatively strong, relatively thick synthetic plastic film.
In this embodiment, the end and side edges of the outer bag 12 are heat sealed together with the edges of the inner protective bag there between, as shown in Figure 2. The bag thus formed has a closed end 16, two side edges 17 and 18 and open end 19. The end of the inner bag, however, is spaced from the open end 19 which facilitates sealing of a packing bag when loaded with product. The relatively thick protective bag, while heat sealable, requires substantial heat which takes a significant period of time. Accordingly, it is far more efficient to seal only the outer bag which seals at a relatively low temperature and relatively more quickly.
The protective inner bag may be a multilayer bag formed of polyethylene and incorporating an outside tacky layer, a middle layer of bimodal, which is a tough polymer and provides substantial strength to the bag, and a third, relatively cheap, linear low density polyethylene. Such material is known in the art and does not constitute part of this invention.
The outer edges of the inner bag 14 are preferably sealed to the outer bag 12 along sealing lines 21 adjacent or on the edges. Such sealing lines ensure that no material can be mistakenly inserted between the inner and outer bags.
With the bag of this embodiment, the protective film is physically located on the inside of the bag so that any product within the bag is protected against oxygen transmission by the outer, lower oxygen transmission film. The inner bag is held in position by the edge seals. If desired, the inner bag material may be laminated to the outer bag material by an adhesive and/or heat/and or pressure prior to bag manufacture to facilitate material handling.
In an alternative embodiment as shown in Figure 3, the bag may be formed by folding rather than end or side edge sealing, although even with a folding technique, the edge may be sealed.
Many modifications may be made in the design and/or construction of a packing bag in accordance with the present invention and all such modifications, which come within the scope of the invention, shall be deemed to be within the ambit of the above description.

Claims

The claims defining the invention are as follows:
1. A packing bag made of an outer bag and an inner bag to protect the outer bag from damage by the contained product.
2. The outer bag of the packing bag described in Claim 1 could be manufactured from low oxygen transmission synthetic plastic film that enables the invention to be heat sealed easily and quickly in a packing process.
3. The inner bag of the packing bag described in Claim 1 could be manufactured from a synthetic plastic film that is very strong and protects the outer bag of Claim 1 from damage by the product contained within the packing bag of Claim 1.
4. The inner bag of Claim 1. is shorter than the outer bag of Claim 1 and the inner bag is heat-sealed at its side edges to the outer bag.
5. The base of the packing bag of Claim 1 may either be heat sealed
Figure imgf000007_0001
process.
6. A packing bag substantially as herein described with reference to the accompanying drawings.
PCT/AU2003/001367 2002-10-16 2003-10-16 Inner and outer bags for packaging meat products WO2004035406A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003277942A AU2003277942A1 (en) 2002-10-16 2003-10-16 Inner and outer bags for packaging meat products

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2002952091 2002-10-16
AU2002952091A AU2002952091A0 (en) 2002-10-16 2002-10-16 Improvements in bags for packaging

Publications (1)

Publication Number Publication Date
WO2004035406A1 true WO2004035406A1 (en) 2004-04-29

Family

ID=28047659

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2003/001367 WO2004035406A1 (en) 2002-10-16 2003-10-16 Inner and outer bags for packaging meat products

Country Status (2)

Country Link
AU (1) AU2002952091A0 (en)
WO (1) WO2004035406A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1714892A2 (en) * 2005-04-20 2006-10-25 Alcan Technology & Management Ltd. Packaging bag with overwrap
US10285774B2 (en) 2017-09-18 2019-05-14 Certol International LLC Medical kit and dispenser for medical kits
JP2020050391A (en) * 2018-09-27 2020-04-02 北興化学工業株式会社 Packaging bag for agricultural chemical and agricultural chemical packaging method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3574642A (en) * 1969-05-15 1971-04-13 American Can Co Package for and method of packaging meats
US3681092A (en) * 1968-10-25 1972-08-01 Dow Chemical Co Fresh meat packaging
US4481669A (en) * 1978-06-26 1984-11-06 W. R. Grace & Co., Cryovac Div. Multi-walled plastics bag
WO1990000137A1 (en) * 1988-07-01 1990-01-11 Integrated Packaging Systems, Inc. Bone-in meat package and method and distribution system employing same
EP0306207B1 (en) * 1987-08-25 1993-03-31 Daniel A. Pharo Packaging system and method
US6004599A (en) * 1998-08-10 1999-12-21 Viskase Corporation Bag for packaging bone-in cuts of meat
US6206569B1 (en) * 1997-03-07 2001-03-27 Curwood, Inc. Puncture-resistant barrier pouch

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3681092A (en) * 1968-10-25 1972-08-01 Dow Chemical Co Fresh meat packaging
US3574642A (en) * 1969-05-15 1971-04-13 American Can Co Package for and method of packaging meats
US4481669A (en) * 1978-06-26 1984-11-06 W. R. Grace & Co., Cryovac Div. Multi-walled plastics bag
EP0306207B1 (en) * 1987-08-25 1993-03-31 Daniel A. Pharo Packaging system and method
WO1990000137A1 (en) * 1988-07-01 1990-01-11 Integrated Packaging Systems, Inc. Bone-in meat package and method and distribution system employing same
US6206569B1 (en) * 1997-03-07 2001-03-27 Curwood, Inc. Puncture-resistant barrier pouch
US6004599A (en) * 1998-08-10 1999-12-21 Viskase Corporation Bag for packaging bone-in cuts of meat

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1714892A2 (en) * 2005-04-20 2006-10-25 Alcan Technology & Management Ltd. Packaging bag with overwrap
WO2006111243A2 (en) * 2005-04-20 2006-10-26 Alcan Technology & Management Ltd. Packaging bag comprising an external packaging
EP1714892A3 (en) * 2005-04-20 2007-02-07 Alcan Technology & Management Ltd. Packaging bag with overwrap
WO2006111243A3 (en) * 2005-04-20 2007-03-08 Alcan Tech & Man Ltd Packaging bag comprising an external packaging
US10285774B2 (en) 2017-09-18 2019-05-14 Certol International LLC Medical kit and dispenser for medical kits
US10675119B2 (en) 2017-09-18 2020-06-09 Certol International LLC Medical kit and dispenser for medical kits
US10675120B2 (en) 2017-09-18 2020-06-09 Certol International LLC Medical kit and dispenser for medical kits
JP2020050391A (en) * 2018-09-27 2020-04-02 北興化学工業株式会社 Packaging bag for agricultural chemical and agricultural chemical packaging method
JP7347898B2 (en) 2018-09-27 2023-09-20 北興化学工業株式会社 Packaging bags for agricultural chemicals and packaging methods for agricultural chemicals

Also Published As

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