Claims
- 1. A packaging system for preserving a perishable item, wherein said packaging system is comprised of a gas permeable tray comprised of open-cell foam, wherein said gas permeable tray is disposed within a sealed, oxygen-impermeable barrier bag, and wherein:(a) said gas permeable tray is comprised of foam material, wherein at least about 20 volume percent of said foam material is open cell foam comprised of a multiplicity of open cells, said open cells comprise a gas phase which comprises less than about 0.05 volume percent of oxygen, and said open cells have an average cell diameter of from about 0.0001 to about 0.030 inches, (b) said gas permeable tray is comprised of a bottom wall and at least one side wall integrally connected to said bottom wall and extending upwardly and outwardly from said bottom wall at an angle of from about 1 to about 90 degrees, wherein each of said bottom wall and said side wall have a thickness of from about 0.025 to about 0.50 inches, (c) said gas permeable tray has a density of from about 0.2 to about 55 pounds per cubic foot, (d) said sealed barrier bag has an oxygen permeability of less than 10 cubic centimeters per 100 square inches per 24 hours, and (f) the atmosphere within said sealed barrier bag is comprised of inert gas and less than about 0.05 volume percent of oxygen.
- 2. The packaging system as recited in claim 1, wherein said tray is covered with a gas-permeable film positioned over and adjacent to said tray to form a wrapped tray.
- 3. The packaging system as recited in claim 1, wherein said gas permeable tray has a water absorbency of from about 5 to about 500 percent.
- 4. The packaging system as recited in claim 1, wherein said gas permeable tray is comprised of from about 0.01 to about 20 weight percent of water-soluble metal chlorite.
- 5. The packaging system as recited in claim 4, wherein said water-soluble metal chlorite is sodium chlorite.
- 6. The packaging system as recited in claim 1, wherein said gas permeable tray is comprised of from about 0.5 to about 25 weight percent of ionic surfactant.
- 7. The packaging system as recited in claim 1, wherein said gas permeable tray is comprised of foam material containing at least about 30 volume percent of open cells.
- 8. The packaging system as recited in claim 1, wherein said gas permeable tray is comprised of foam material containing from about 45 to about 90 volume percent of open cells.
- 9. The packaging system as recited in claim 1, wherein said open cells have an average cell diameter of from about 0.003 to about 0.007 inches.
- 10. The packaging system as recited in claim 1, wherein each of said bottom wall and each of said side wall of said gas permeable tray has a thickness of from about 0.04 to about 0.1 inches.
- 11. The packaging system as recited in claim 1, wherein said gas permeable tray has a density of from about 2 to about 5 pounds per cubic foot.
- 12. The packaging system as recited in claim 2, wherein said gas permeable film has a thickness of from about 0.5 to about 1.5 mils.
- 13. The packaging system as recited in claim 2, wherein said gas permeable film is a polyvinyl chloride film.
- 14. The packaging system as recited in claim 2, wherein said gas permeable film is comprised of perforations.
- 15. The packaging system as recited in claim 1, wherein said barrier bag has an oxygen permeability of less than 5 cubic centimeters per 100 square inches per 24 hours.
- 16. The packaging system as recited in claim 1, wherein said gas-permeable tray is comprised of a layer of open-celled foam and, contiguous therewith, a skin layer.
- 17. The packaging system as recited in claim 16, wherein said skin layer has a thickness of from about 0.002 to about 0.005 inches.
- 18. The packaging system as recited in claim 1, wherein said gas permeable tray is comprised of polystyrene foam.
- 19. The packaging system as recited in claim 1, wherein said barrier bag is comprised of shrink film.
CROSS-REFERENCE TO RELATED PATENT APPLICATIONS
This application is a continuation-in-part of applicant's copending patent applications U.S. Ser. No. 09/519,105, filed on Mar. 6, 2000, which was a continuation-in-part of U.S. Ser. No. 09/342,844, filed on Jun. 29, 1999 now U.S. Pat. No. 6,112,890. This case is also a continuation-in-part of patent applications U.S. Ser. No. 09/196,450 (filed Nov. 19, 1998) and U.S. Ser. No. 09/182,754 (filed Oct. 29, 1998).
US Referenced Citations (18)
Continuation in Parts (4)
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Number |
Date |
Country |
Parent |
09/519105 |
Mar 2000 |
US |
Child |
09/609798 |
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US |
Parent |
09/342844 |
Jun 1999 |
US |
Child |
09/519105 |
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US |
Parent |
09/196450 |
Nov 1998 |
US |
Child |
09/342844 |
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US |
Parent |
09/182754 |
Oct 1998 |
US |
Child |
09/196450 |
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US |