초록 ▼

The invention provides a flexible packaging sheet including one or more supporting sheets and a base sheet to which is applied a microwave interactive material in the form of a coating or film. The microwave interactive material can comprise any of several elemental metals or oxides such as iron oxi

The invention provides a flexible packaging sheet including one or more supporting sheets and a base sheet to which is applied a microwave interactive material in the form of a coating or film. The microwave interactive material can comprise any of several elemental metals or oxides such as iron oxide or tin oxide or a thin semiconductive metallic film applied by vacuum electrodeposition. The supporting sheets comprise non-thermoplastic fibrous sheet material such as paper. The base sheet can comprise a plastic resinous material such as polyester.

대표청구항 ▼

A flexible laminate folded into the form of a bag, said bag enclosing a food product adapted to be heated within the bag in a microwave oven, said laminate comprising, an enclosed layer of a microwave interactive coupling material comprising a lossy substance which becomes hot within a microwave ove

A flexible laminate folded into the form of a bag, said bag enclosing a food product adapted to be heated within the bag in a microwave oven, said laminate comprising, an enclosed layer of a microwave interactive coupling material comprising a lossy substance which becomes hot within a microwave oven, said microwave interactive layer being positioned within only that portion of said laminate located beneath the food product when the food product is heated in the bag within a microwave oven, said microwave interactive layer being incorporated into a wall of the bag supporting the food product during heating whereby the food is adapted to rest upon the laminate in heat conductive relationship with the microwave interactive layer therebeneath, said laminate including at least two layers of flexible backing sheet material one of which is an inner layer positioned between the interactive layer and the food product, one of said backing sheets being bonded to each side of the microwave interactive layer to form a sandwich structure in which the microwave interactive layer is encapsulated by being enclosed between the flexible backing sheets on each side thereof, at least the inner layer of backing sheet material being composed of nonthermoplastic cellulosic fibers that assist in preserving the integrity and dimensions of the interactive layer upon exposure to microwave energy, and during heating, the heat being transferred from the interactive layer by conduction to the overlying food product whereby the food is heated by the heat transferred from the microwave interactive layer through the inner backing sheet to raise the temperature of the food body by heating one surface thereof without damaging portions of the bag remote from the food.