| 摘要 |
PROBLEM TO BE SOLVED: To provide a core material combining gas permeability and water absorbability without using a special raw material, and its manufacturing method. SOLUTION: The core material comprises polyurethane foam at least as one of materials, and at least two kinds of parts different in compressibility, wherein high compression parts and low compression parts and/or uncompressed parts are regularly arranged. COPYRIGHT: (C)2006,JPO&NCIPI |
