Multi-layered structure
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United States of America Patent
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-
Nov 17, 1992
Grant Date -
N/A
app pub date -
Oct 29, 1990
filing date -
Oct 29, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multilayer structure is provided which has a core layer of a hygroscopic barrier material and inner and outer surface layers designed to facilitate the escape of moisture which becomes absorbed in the core layer during retort sterilization. The inner and outer surface layers include a polyolefin material which is either foamed or compounded with a filler in order to cause a substantial increase in the water vapor transmission rate of the polyolefin. Adhesive layers are present between the core layer and the inner and outer layers. Each of the inner and outer layers may include one or more individual film layers, depending on the requirements of the specific packaging application.
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