Thermal insulator
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United States of America Patent
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Jul 16, 1985
Grant Date -
N/A
app pub date -
Dec 3, 1981
filing date -
Dec 9, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A thermal insulator comprises an expanded resin body having embedded therein an evacuated powder insulation portion which consists of fine powder and a container of film-like plastics or a film-like composite of plastics and metal for enclosing the powder. The resin body has been expanded by a Freon gas as a blowing agent. Since a Freon gas has a larger molecular diameter than the constituent gases of air, it is less likely to permeate through the container than air. Thus present invention provides a novel composite insulator which fully utilizes the benefits of vacuum insulation without necessitating a strong and costly material for a vacuum container.
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