| 摘要 |
<p>PURPOSE:To enable correct thermal fusion welding by controlling reliably and easily the slack of a sheet material of an overlap part, by a method wherein a pair of sheet materials is overlapped and is made to weld by fusing by sticking a hard sheet on the top of the lower sheet material along an overlap fusion welding part. CONSTITUTION:A pair of sheets 10, 12 is overlapped extending over a width L and an edge part of the sheet 12 is arranged lower than that of the sheet 10. This overlap part of the sheets is so constituted that a nozzle of a thermal fusion welding device is advanced in the direction of an arrow A in a space between both the sheets which becomes the underside of the sheet 10 and the upper side of the sheet 12, through which the overlap part is heated and thermal fusion welding of a molten part is made to perform by making rolling press by a rolling press roller. A hard sheet 14 which is harder than the sheets 10, 12 is affixed on the lower wheet 12 along the overlap part through a double-sided adhesive tape 16. As the fusion welding of the sheets 10, 12 is made to advance in the direction of the arrow A, the overlap part can be made to weld thermally by fusion through heating, pressing and cooling.</p> |
