B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
154/108, 327/2.1
B32B 15/08 (2006.01) B32B 27/36 (2006.01) B65D 81/34 (2006.01) H05B 6/64 (2006.01)
Patent
CA 1327302
ABSTRACT This invention relates to articles that are capable of absorbing microwave energy and converting same to heat energy. In the case of microwave energy absorbing materials employing thin metal coatings on a polymeric substrate, only a certain amount of heating can be achieved with a given metal before it begins to arc and destroy the polymeric sheet as well as the metallic coating itself. Arcing may also adversely affect a microwave oven, and in some circumstances may even result in a fire. This invention provides a microwave absorbing composite comprising at least two zones of material capable of absorbing microwave energy, each set of said two zones being separated by one zone of material transparent to or transmissive of microwave energy. The microwave energy absorbing zones are selected such that the composite is incapable of arcing in a microwave oven whereof the maximum power output does not exceed 2000 watts at a frequency of 2.45 GHz. The major advantage of the composite of this invention is that the composite can absorb significantly more microwave energy from such sources as a microwave oven without undergoing arcing than can a susceptor having only a single microwave absorbing zone. The composite can therefore develop heat at a faster rate, without arcing, when employed as a microwave susceptor than can a susceptor having only a single microwave absorbing zone. The composite of this invention can be used for such purposes as crisping, browning, or otherwise heating food products, as a material for packaging, or as a package venting material.
578390
Emslander Jeffrey Owen
Larson Curtis Lee
Lepere Pierre H.
Minnesota Mining And Manufacturing Company
Smart & Biggar
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