| 摘要 |
PURPOSE:To keep distortion due to thermal expansion per one hot plate smaller, press sealing parts of films uniformly, and prevent unfavorable appearance of the sealed parts or unevenness of the sealing strength from happening by a method wherein hot plates are formed into split type ones, and a pressing surface with a designated length is constituted by connecting a plurality of the split type hot plates. CONSTITUTION:A heater 12 is connected with power and heated, and hot plates 14, 14... are heated through heat transfer plates 11, 11.... The heating temperature is determined depending on the material, etc., of films, F, F. To the films F, F on a cushioning material C, pressing members R2, R2 are lowered together with an attaching member R, and the films F, F are mechanically held. When the attaching member R is further lowered, pressing surfaces 14a, 14a... of the hot plates 14, 14... and holding surfaces 11b1, 1b, 1... of holding chips 11b, 11b... come into contact with the films F, F, and sealing areas F1, F1 are welded and heat sealed. A heating blade 13 is instantly heated by a large current, the films F, F are weld-cut through a weld-cut area F2. The holding chips 11b, 11b... prevent the welding of the films F, F from being over-welded. |
