| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem in which attention was not paid to the internal structure of a fiber, though heat-insulating performance and temperature-keeping performance have been improved hitherto by a material itself of the fiber or external form of the fiber. SOLUTION: Heat insulating performance is remarkably improved by forming the internal structure of the fiber into hollow tubes or a foamy hollow structure. COPYRIGHT: (C)2008,JPO&INPIT
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