| 摘要 |
PROBLEM TO BE SOLVED: To prevent degradation and separation, etc., of a sealant in a joint by fully thickening the sealant that is usually placed only thinly in fear of the inflation and drawing of the sealant. SOLUTION: An air-permeable backup material 1 for sealing is contacted with a hollow part of an external wall member 3 molded by hollow extrusion, and when air in the hollow part is compressed, the ventilation of air is provided therebehind. COPYRIGHT: (C)2003,JPO
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