Microwaveable barrier films

Details Microwaveable barrier films Microwaveable barrier films

1991-09-05

1993-10-26

Reynolds, Bruce A.

Electric heating

Metal heating

Of cylinders

219 1050F, 426107, 426113, 426234, 426243, 99DIG14, 428323, H05B 680

Patent

active

052568466

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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