| 摘要 |
PURPOSE:To prevent the generation of sparks and to shorten the working period, by covering the lower part of an upper electrode with a thin molecular film not capable of being welded by high-frequency welding, and carrying out high-frequency welding of a synthetic resin sheet onto a conductive composite sheet. CONSTITUTION:The composite sheet comprises the conductive sheet 4 of which the both surfaces are covered with insulation sheets (such as soft vinyl chloride resin sheets) 3, 3, and the insulation sheet (such as a soft vinyl chloride resin sheet) 3' capable of being welded by high-frequency welding is laid on the composite sheet. On the lower part of the upper electrode 1 is formed the high molecular film (such as a polyester film) 2 not capable of being welded by high-frequency deposition welding, and said welding is performed with an insulation underlay 5 placed on the lower electrode (surface table) 6. |
