Importance

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Abstract

Shelf stable packaging films and packages which are microwaveable yet are substantially impermeable to gases and ultraviolet energy and selectively permeable to microwave energy are described. The films include a water vapor and oxygen barrier substrate having a first side upon which is deposited a metallic coating capable of selectively transmitting a portion of a microwave energy field through the substrate. The coating is formed in a plurality of discrete, microwave reflective areas separated by non-reflective gaps. The shape and spacing of the areas is varied so that the microwave energy transmission through non-coated areas of the barrier is sufficient to avoid arcing and heat the object but not cook the object. A food packaging system for storing and heating food by microwave energy, which includes the microwave barrier film of this invention, is also described.

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First Claim