Gas Atmosphere packaging
First Claim
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1. A process for preparing foamed plastic food containers for contact with food, which food is adversely affected by air contact, comprising exchanging the air in the interstices of the foam for a packaging gas prior to using the containers for packaging of food.
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Abstract
Foamed plastic food containers are prepared for contact with food by exchanging the air in the interstices of the foam for a packaging gas prior to using the containers for packaging of food.
29 Citations
19 Claims
- 1. A process for preparing foamed plastic food containers for contact with food, which food is adversely affected by air contact, comprising exchanging the air in the interstices of the foam for a packaging gas prior to using the containers for packaging of food.
- 3. A process for preparing foamed plastic food trays for gas atmosphere packaging by confinement in a gas tight storage receptacle which presents high resistance to ambient oxygen entry, with a packaging gas before the bags hold food, such confinement being sufficiently long for a substantial percentage of the air in the foam to exchange with the gas in the storage container.
- 5. A process of preparing plastic foam trays for use with meat and other fresh protein foods comprising, before placing the trays in contact with food, subjecting the trays to a packaging gas atmosphere in order to exchange interstitial air in the plastic foam for the packaging gas until substantial exchange with the interstitial air occurs.
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12. A process as claimed in 9 wherein the storage receptacle is vented whereby the air in the air/packaging gas mixture is able to leave the receptacle under the subliming vapour pressure of the carbon dioxide but air is prevented from re-entry.
- 18. A process for preparing plastic foam containers for use with food, wherein there is air in the foam, which air tends to adversely affect the food, comprising, prior to using the containers for packaging of food, exchanging the air in the foam for a packaging gas, in combination with a conventional gas atmosphere packaging process.
Specification