| 摘要 |
845,307. Dielectric heating. YAMAGUCHI, S. July 2, 1957, No. 20834/57. Class 39(3). [Also in Group VIII] A method of welding fabrics, made of synthetic fibres, by high frequency electric energy is characterized in that the welding is carried out when the fabric is artificially moistened. As shown, nylon fabrics 1, 2 are welded at spots 3, each spot being of elliptic shape. The spot welding electrode used preferably produces a curved depression, Fig. 3, rather than an angular depression, Fig. 4 (not shown). |
