Modifield atmosphere package for cut of raw meat

• US 5,698,250 A
• Filed: 04/03/1996
• Issued: 12/16/1997
• Est. Priority Date: 04/03/1996
• Status: Expired due to Term

• Current Assignee: Pactiv LLC (Graeme Richard Hart, MBA)
• Original Assignee: Tenneco Packaging, Inc. (Pactiv)
• Inventors: Wu, Wen P., Luthra, Vinod K., Deyo, Alan E., DelDuca, Gary R.
• Primary Examiner(s): Drodge, Joseph W.
• Application Number:
  US08/627,137
• Time in Patent Office: 622 Days
• Field of Search: 53/432-434, 426/124, 426/127, 426/129, 426/133, 426/396, 426/418, 426/392, 206/557
• US Class Current: 426/124
• CPC Class Codes: A23B 4/16 in the form of gases, e.g. fumigation; Compositions or apparatus therefor
• CPC Class Codes: A23L 3/3418 in a controlled atmosphere, e.g. partial vacuum, comprising only CO2, N2, O2 or H2O
• CPC Class Codes: A23L 3/3436 Oxygen absorbent
• CPC Class Codes: B65D 77/003 Articles enclosed in rigid or semi-rigid containers, the whole being wrapped
• CPC Class Codes: B65D 81/26 with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents B65D33/01 takes precedence; Applications of corrosion inhibitors or desiccators
• CPC Class Codes: B65D 81/268 the absorber being enclosed in a small pack, e.g. bag, included in the package

Abstract

A modified atmosphere packaging system and method creates a modified atmosphere in a package including an inner container and an outer container. The inner container is composed at least partially of a polymeric material substantially permeable to oxygen, while the outer container is composed of a polymeric material substantially impermeable to oxygen. After a food product such as raw meat is placed within the inner container, the inner container is flushed with a desired mixture of gases to substantially remove oxygen from the inner container. The flushed inner container is then sealed and inserted into the outer container without sealing the outer container. Next, the outer container is flushed with the desired mixture of gases to substantially remove oxygen from the outer container. After flushing the outer container, the outer container is sealed. An oxygen scavenger is provided in the package to substantially absorb any residual oxygen within the package.

Claims

1. A modified atmosphere package, comprising:

an inner container comprised of a polymeric material substantially permeable to oxygen, said inner container being configured and sized to fully enclose a retail cut of raw meat;

an outer container comprised of a polymeric material substantially impermeable to oxygen, said outer container enclosing said inner container, said inner container being removable from at least a portion of said outer container without destroying said inner container, said inner container being differently shaped than said outer container, said outer container being substantially free of oxygen therein in response to said outer container being flushed with one or more gases creating a modified atmosphere within said outer container; and

an oxygen scavenger activated with an activating agent and positioned external to said inner container to substantially absorb residual oxygen within the modified atmosphere package.

2. The modified atmosphere package of claim 1, wherein said inner container includes a tray and a cover, said cover being engaged to said tray to form said inner container.

3. The modified atmosphere package of claim 2, wherein said tray is comprised of polystyrene foam.

4. The modified atmosphere package of claim 2, wherein said cover is a stretch film.

5. The modified atmosphere package of claim 4, wherein said stretch film contains polyvinyl chloride.

6. The modified atmosphere package of claim 2, wherein said tray includes a bottom wall, a continuous side wall, and a continuous rim, said continuous side wall encompassing said bottom wall and extending upwardly and outwardly from said bottom wall, said continuous rim encompassing an upper edge of said continuous side wall and projecting laterally outwardly therefrom.

7. The modified atmosphere package of claim 1, wherein said inner container is substantially free of oxygen therein in response to said inner container being flushed with said one or more gases.

8. The modified atmosphere package of claim 1, wherein said outer container includes a polymeric bag.

9. The modified atmosphere package of claim 8, wherein the polymeric material of said polymeric bag includes oriented polypropylene and an oxygen barrier polymer.

10. The modified atmosphere package of claim 1, wherein said oxygen scavenger includes an oxygen-absorbing packet loosely disposed between said inner and outer containers.

11. The modified atmosphere package of claim 1, wherein said oxygen scavenger includes an oxygen-absorbing material integrated into said polymeric material of said outer container.

12. A method of creating a modified atmosphere in a package including an inner container and an outer container, said inner container being comprised of a polymeric material substantially permeable to oxygen, said outer container being comprised of a polymeric material substantially impermeable to oxygen, said method comprising the steps of:

placing a retail cut of raw meat within said inner container;

sealing said inner container;

inserting said inner container into said outer container without sealing said outer container, said inner container being removable from at least a portion of said outer container without destroying said inner container and being differently shaped than said outer container;

substantially removing oxygen from said outer container, without evacuating said outer container, by flushing said outer container with one or more gases;

sealing said outer container;

providing an oxygen scavenger in the package external to said inner container to substantially absorb residual oxygen within the package; and

activating said oxygen scavenger with an activating agent.

13. The method of claim 12, further including the step of flushing said inner container with said one or more gases to substantially remove oxygen from said inner container prior to said step of sealing said inner container.

14. The method of claim 12, wherein said inner container includes a tray and a stretch film cover, and wherein said step of sealing said inner container includes wrapping said stretch film cover over said tray.

15. The method of claim 12, wherein said outer container includes a polymeric bag, and wherein said step of inserting said inner container into said outer container includes placing said inner container within said polymeric bag.

16. The method of claim 12, wherein said step of flushing said outer container lowers an oxygen level within said outer container to less than approximately 5 percent.

17. The method of claim 16, wherein said one or more gases include carbon dioxide and nitrogen.

18. The method of claim 12, wherein said outer container includes a polymeric bag, and wherein said step of sealing said outer container includes thermally fusing unsealed edges of said polymeric bag.

19. The method of claim 12, wherein said oxygen scavenger includes an oxygen-absorbing packet loosely disposed between said inner and outer containers.

20. The method of claim 12, wherein said oxygen scavenger includes an oxygen-absorbing material integrated into said polymeric material of said outer container.

21. A method of manufacturing a modified atmosphere package, said method comprising the steps of:

supplying an inner container comprised of a polymeric material substantially permeable to oxygen;

placing a retail cut of raw meat within said inner container;

sealing said inner container;

supplying an outer container comprised of a polymeric material substantially impermeable to oxygen;

inserting said inner container into said outer container without sealing said outer container, said inner container being removable from at least a portion of said outer container without destroying said inner container and being differently shaped than said outer container;

substantially removing oxygen from said outer container, without evacuating said outer container, by flushing said outer container with one or more gases;

sealing said outer container;

supplying an oxygen scavenger in the package external to said inner container to absorb residual oxygen within the package; and

activating said oxygen scavenger with an activating agent.

22. The method of claim 21, further including the step of flushing said inner container with said one or more gases to substantially remove oxygen from said inner container prior to said step of sealing said inner container.

23. A modified atmosphere packaging system for creating a modified atmosphere in a package including an inner container, an outer container, and an oxygen scavenger, said inner container being comprised of a polymeric material substantially permeable to oxygen, said inner container being configured and sized to fully enclose a retail cut of raw meat, said outer container being comprised of a polymeric material substantially impermeable to oxygen, said oxygen scavenger being activated with an activating agent and positioned external to said inner container to substantially absorb residual oxygen within the package, said system comprising:

means for sealing said inner container with said retail cut of raw meat enclosed therein;

means, disposed downstream from said means for sealing said inner container, for inserting said sealed inner container into said outer container without sealing said outer container, said inner container being removable from at least a portion of said outer container without destroying said inner container and being differently shaped than said outer container;

means, disposed downstream from said means for inserting said sealed inner container, for substantially removing oxygen from said outer container, without evacuating said outer container, by flushing said outer container with one or more gases; and

means, disposed downstream from said means for substantially removing oxygen from said outer container, for sealing said outer container.

24. The system of claim 23, further including means, disposed upstream from said means for sealing said inner container, for flushing said inner container with said one or more gases to substantially remove oxygen from said inner container.