| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain an extremely highly reliable joining structure without generating irregularity in fusion weld strength wherein it can be executed at a low cost without installing large-scaled machine and facilities on execution site, and its appearance is excellent. SOLUTION: A waterproof sheet 1 is obtained wherein end parts of thermoplastic sheets 1a, 1b of a thermoplastic resin such as a thermoplastic polyolefin resin or the like, polyolefin thermoplastic elastomer or the like are thermally fusion welded. A laminate film 3 wherein at least two layers of different melting points of a lowest layer film and a highest layer film are laminated, is placed on a joining part 2 of the thermoplastic sheets 1a, 1b, and they are integrated by thermal fusion welding. The integrated product is formed of materials wherein a melting point of the lowest layer film of the laminate film 3 is lower than a melting point of the highest layer film.</p> |
