Retort Pouches - an overview ScienceDirect Topics
A middle layer of aluminum foil is used to increase product shelf life by acting as a barrier to passage of light water and oxygen. The foil layer may vary in thickness (0.00035–0.0007 in or 0.0089–0.0179 mm) according to its intended application. The inner layer of polypropylene provides an excellent food contact surface because of its ...
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