Abuse-tolerant metallic packaging materials for microwave...

H - Electricity – 05 – B

Patent

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H05B 6/80 (2006.01) B65D 81/34 (2006.01)

Patent

CA 2434901

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.

Cette invention concerne un matériau d'emballage supportant de mauvaises utilisations pour aliments destinés à la cuisson par micro-ondes. Cet emballage comprend des ensembles répétés de feuilles métalliques ou de segments de matériau évaporé à haute densité optique (22, 30) disposés sur un substrat. Chacun des segments métalliques (22, 30) est conçu pour définir un périmètre (24, 32) d'une longueur égale à une fraction prédéterminée de la longueur d'onde opérationnelle ou effective d'un four à micro-ondes en marche. Les ensembles répétés de segments (22, 30) agissent tant comme écran contre l'énergie thermique et comme éléments concentrateurs de l'énergie des micro-ondes lorsqu'ils ont utilisés avec des produits alimentaires, tout en offrant la sécurité électrique requise en l'absence de produits alimentaires.

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