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.
申请公布号
US4529638(A)
申请公布日期
1985.07.16
申请号
US19810327018
申请日期
1981.12.03
申请人
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;MATSUSHITA REIKI CO., LTD.