| 摘要 |
PROBLEM TO BE SOLVED: To improve welding strength between two film sheets by a method wherein staple fibers are arranged between the two film sheets and after they are laminated, high frequency welding is performed thereon. SOLUTION: After staple fibers 2 are arranged between PVC film sheets 1 and 1, two film sheets 1 and 1 are pressed and high frequency welding is performed thereon under ordinarily generally performed welding condition. When a water bag for a water bed or an air bag is prepd. with these film sheets between which the staple fibers are arranged, high frequency welding is performed to make them into a bag-like shape. As these staple fibers, e.g., staple fibers with a length of 10mm prepd. by cutting and untwisting a polyester woven fabric are used. The staple fibers arranged between the film sheets penetrate into the film sheets and the staple fibers are welded on the welded interface and exist so as to bridge between two film sheets and it is possible to improve welding strength accompanied with reinforcing effect of the welded part. |
