| 摘要 |
PURPOSE:To keep shrinkage of sheets,which develops at welding, to minimum by developing the shrinkage only in the clearances, with which jigs are mounted at both sides of a heating element by a method wherein pulse waves are applied across fluoroplastic sheets, each of which is brought into contact with the heating element and the jig mounted on one of both the sides of the heating element with said clearance and pressurized. CONSTITUTION:Jigs (plates or cushioning) are mounted with the clearances of several millimeters on both sides of a heating element and at the height same as that of the heating element to a supporting stand, on which the heating element is installed. The supporting stand equipped with the heating element and the jigs is served as a welding electrode part. Pulse waves are applied across fluoroplastic sheets, which are brought into contact with the welding electrode part and pressurized. Though the fluoroplastic sheets weld together by melting, the shrinkage developed at welding does not spread outside the jigs due to the jigs assembled in the welding electrode part or concretely the shrinkage develops in the clearances of several millimeters made between the heating element and the respective jigs. |
