Food package with a microwave releasable sealed closure

Details Food package with a microwave releasable sealed closure Food package with a microwave releasable sealed closure

1988-08-19

1990-05-15

Czaja, Donald E.

Food or edible material: processes, compositions, and products

Packaged or wrapped product

Having specific electrical or wave energy feature

426113, 426243, 426234, 22912535, 229903, B65B 2522

Patent

active

049256840

ABSTRACT:
The present invention provides a food package useful for heating a food product in a microwave oven. The package has a tray with an opening for introducing the food product therein. Once the food has been introduced into the tray, the opening is sealed using a microwave releasable adhesive. The microwave releasable adhesive seal includes a microwave interactive material in close proximity to a heat-releasable resin containing a blowing agent. The microwave interactive material preferably is composed of metallic flakes which become hot when exposed to microwave energy. Consequently, when the package is heated in a microwave oven, the microwave interactive material becomes hot, causing the blowing agent to decompose and form a gas. The gas formation destroys the integrity of the seal between the tray and the closure, permitting the seal to be opened easily after heating in a microwave oven.

REFERENCES:
patent: 3276900 (1966-10-01), Funck
patent: 3865302 (1972-11-01), Kane
patent: 4013798 (1977-03-01), Goltsos
patent: 4210674 (1980-07-01), Mitchell
patent: 4404241 (1983-09-01), Mueller et al.
patent: 4469258 (1984-09-01), Wright et al.
patent: 4521466 (1985-06-01), White
patent: 4563482 (1986-01-01), Tanizawa et al.
patent: 4640838 (1987-02-01), Isakson et al.
patent: 4656325 (1987-04-01), Keefer
patent: 4676857 (1987-06-01), Scharr et al.

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