Modified atmosphere package for cut of raw meat

• US 5,811,142 A
• Filed: 12/13/1996
• Issued: 09/22/1998
• 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:
  US08/763,719
• Time in Patent Office: 648 Days
• Field of Search: 426/124, 426/129, 426/133, 426/392, 426/396, 426/397, 426/410, 426/418, 206/213.1, 206/557, 53/432-434, 53/510, 252/188.28
• 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 method creates a modified atmosphere in a package including an inner package and an outer package. The inner package is composed at least partially of a polymeric material substantially permeable to oxygen, while the outer package is composed of a polymeric material substantially impermeable to oxygen. After a food product such as raw meat is placed within the inner package, the inner package is flushed with a desired mixture of gases to substantially remove oxygen from the inner package. The flushed inner package is then sealed and inserted into the outer package without sealing the outer package. Next, the outer package is flushed with the desired mixture of gases to substantially remove oxygen from the outer package. After flushing the outer package, the outer package is sealed. An oxygen scavenger is provided in the package to substantially absorb any residual oxygen within the package. The oxygen scavenger is activated with an oxygen uptake accelerator to increase the rate at which the residual oxygen is absorbed.

Claims

1. A modified atmosphere package, comprising:

a first package configured and sized to substantially totally enclose a retail cut of raw meat and including a non-barrier portion substantially permeable to oxygen;

a second package covering said first package and being substantially impermeable to oxygen, said second package creating a pocket between said first package and said second package, said pocket being substantially free of oxygen solely in response to said pocket being flushed with one or more gases creating a modified atmosphere within said pocket; and

an oxygen scavenger positioned external to said first package to substantially absorb residual oxygen within said pocket, said oxygen scavenger being activated with an oxygen uptake accelerator.

2. The modified atmosphere package of claim 1, wherein said non-barrier portion has a rate of oxygen permeability greater than about 1000 cubic centimeters per 100 square inches in 24 hours.

3. The modified atmosphere package of claim 2, wherein said second package has a rate of oxygen permeability less than about 0.1 cubic centimeters per 100 square inches in 24 hours.

4. The modified atmosphere package of claim 1, wherein said oxygen scavenger is constructed to reduce a level of said residual oxygen at a rate sufficient to prevent discoloration of said raw meat.

5. The modified atmosphere package of claim 4, wherein said oxygen scavenger is constructed to reduce a level of said residual oxygen to less than about 0.05 percent within 90 minutes after flushing and sealing said second package.

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

7. The modified atmosphere package of claim 1, wherein said oxygen scavenger includes an oxygen-absorbing packet loosely disposed between said first and second packages.

8. The modified atmosphere package of claim 1, wherein said oxygen scavenger includes an oxygen-absorbing material integrated into the material used to form said second package.

9. A modified atmosphere package, comprising:

first package means for substantially totally enclosing a retail cut of raw meat, said first package means including a non-barrier portion substantially permeable to oxygen;

second package means for covering said first package means, said second package means being substantially impermeable to oxygen, said second package means creating a pocket between said first package means and said second package means, said pocket being substantially free of oxygen solely in response to being flushed with one or more gases creating a modified atmosphere within said pocket;

oxygen scavenging means for scavenging any residual oxygen within said pocket, said oxygen scavenging means being positioned external to said first package means; and

means for activating said oxygen scavenging means.

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

supplying a first package including a non-barrier portion substantially permeable to oxygen;

placing a retail cut of raw meat within said first package;

sealing said first package;

supplying a second package substantially impermeable to oxygen;

covering said first package with said second package without sealing said second package so as to create a pocket between said first package and said second package;

substantially removing oxygen from said pocket solely by flushing said pocket with one or more gases;

supplying an oxygen scavenger positioned external to said first package to absorb residual oxygen within the pocket;

activating said oxygen scavenger with an oxygen scavenger accelerator; and

sealing said second package.

11. The method of claim 10, wherein said non-barrier portion has a rate of oxygen permeability greater than about 1000 cubic centimeters per 100 square inches in 24 hours.

12. The method of claim 11, wherein said second package has a rate of oxygen permeability less than about 0.1 cubic centimeters per 100 square inches in 24 hours.

13. The method of claim 10, wherein said oxygen scavenger is constructed to reduce a level of said residual oxygen at a rate sufficient to prevent discoloration of said raw meat.

14. The method of claim 13, wherein said oxygen scavenger is constructed to reduce a level of said residual oxygen to less than about 0.05 percent within 90 minutes after flushing said pocket and sealing said second package.

15. The method of claim 10, wherein said step of substantially removing said oxygen from said outer package reduces a level of said oxygen to about 0.05 to 5.0 percent.