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Method for packaging carbon dioxide absorbing food products

  • US 5,731,023 A
  • Filed: 12/27/1993
  • Issued: 03/24/1998
  • Est. Priority Date: 11/08/1988
  • Status: Expired due to Fees
First Claim
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1. A method for preventing the inwardly collapsing deformation of a flexible package in which is packed a perishable, moisture containing food product capable of absorbing carbon dioxide, comprising the steps of:

  • introducing the product into the package;

    providing;

    both an initial gaseous environment in the package, said initial gaseous environment comprising carbon dioxide gas and being at substantially atmospheric pressure; and

    an amount of solid-phase carbon dioxide inside the package, the amount of solid-phase carbon dioxide being preset according to the amount of carbon dioxide which can be absorbed by the product after packaging;

    heat sealing the package having the product and both the solid-phase carbon dioxide and the initial gaseous environment contained therein, the pressure of said initial gaseous environment defining an original shape of the package in a sealed state which original shape does not cause the package to crush or deform the product or squeeze liquid from the product therein;

    and then leaving both the solid-phase carbon dioxide to sublimate and the product to absorb carbon dioxide in the sealed package, the pressure of carbon dioxide gas in the initial gaseous environment and the amount of solid phase carbon dioxide initially present in the package combining to both provide sufficient carbon dioxide to be absorbed by said perishable food product to acidify the food product to increase the shelf life of the food product and such that at a final carbon dioxide equilibrium condition of carbon dioxide between carbon dioxide absorbed by the food product and carbon dioxide gas between the food product and the package, sufficient carbon dioxide gas remains between the food product and the package such that the final shape of the package being essentially equivalent to the original shape of said package.

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