| 摘要 |
PURPOSE:To make it possible to efficiently form a tubular body by a method wherein a band-like body is bent along a mandrel and both the side edges of the band-like body are projected beyond a gap made between the upper edges of tubular body forming members so as to put them together in order to join them by press contact under heat and, after adhesive is applied onto one side of the joined side edges, the tubular body is made with a pressure welding device. CONSTITUTION:A band-like body (a) is continuously fed along a mandrel 1. When the forming members 6 and 7 of a forming guide 2 are brought into the closed position by means of an opening and closing means 8 under the state that the band-like body (a) is held by the members, then the band-like body (a) is formed into the shape along the mandrel 1 by being guided by the guide edges 13 of the forming members 6 and 7, and both side edges is inserted in a gap made by the upper edges 9 and 10 of the forming members 6 and 7 so that both the side edges are protruded beyond the gap and abutted against each other in order to be put together. Both the side edges which has been abutted against each other are passed through the gap between heaters 22, and bonded to each other through thermowelding film. Further, the resultant welded side edges, to one side of which adhesive is applied with an adhesive coating device 4, are folded with a pressure welding means 31 with the side which is coated with the adhesive as the inner surface, and then adhered onto the outer surface of a tubular body. |
