| 摘要 |
PURPOSE:To manufacture efficiently a heating mat where disconnection does not occurs, by a method wherein a conductive wire coated with thermoplastic resin layer is wound vortically round a single side of the mat formed of thermoplastic resin, and the coated conductive wire is welded to the mat by heating the same. CONSTITUTION:A doughnutlike mat 11a where a hole 111 is opened into the central part is formed of polyethylene resin. A winding jig 2 is provided on the mat 11a, a cover 3 is juxtaposed on the upper part of a base stand of the winding jig 2 and a coated conductive wire 12 is wound vortically round the top of the mat 2 while supplying the same 12 through the bobbin 4. The coated conductive wire 12 is obtained by coating a conductive wire 121 as an element of heating with a thermoplastic resin layer such as the polyethylene resin, the coated conductive wire 12 is heated by pushing a heater 5 onto the wound up coated conductive wire 12 and welded to the mat 11a by melting the thermoplastic resin layer. Simultaneously with the above, since parts of the coated wire 12 adjoining to each other are welded to each other between the thermoplastic resin layers, the one coated conductive wire 12 is formed into a doughnut-shaped matlike state. |
