Patent ID: 8686324
Filing Date: 2014-04-01
Classification: B32B,B65D

Abstract:
1. A method of providing a package for storing and cooking food products, the method comprising the steps of providing a sealing film including, in sequence, an outer protective layer, an adhesive layer, an outer skin layer, a core layer, and an inner heat sealable layer, scoring at least the outer protective layer of the sealing film to a depth that does not perforate the sealing film to cause a weakened wall pattern to be formed in the sealing film, and using the sealing film after the scoring step to form a heatable hermetically sealed package having an inner region bounded by the inner heat sealable layer of the sealing film and an exterior skin defined in part by the outer protective layer of the sealing film and configured to block microorganisms and oxygen from entering the inner region through the weakened wall pattern until the heatable hermetically sealed package is exposed to microwave energy during a microwave cooking cycle and a pressure generated in the inner region exceeds a predetermined magnitude to cause tearing of at least a portion of the weakened wall pattern and venting of the inner region.