Abuse-tolerant metallic packaging materials for microwave cooking

摘要

An abuse-tolerant microwave food packaging material includes repeated sets of metallic foil or high optical density evaporated material segments (22,30) disposed on a substrate. Each set of metallic segments (22,30) is arranged to define a perimeter (24,32) having a length equal to a predetermined fraction of the operating or effective wavelength of an operating microwave oven. The repeated sets of segments (22,30) act both as a shield to microwave energy and as focusing elements for microwave energy when used in conjunction with food products, while remaining electrically safe in the absence of the food products.