| 摘要 |
Roof coverings are formed from underlayment membranes (12) and overlayment membranes (13) which are welded or adhesively bonded thereto. In order to weld the overlayment membrane (13) to the underlayment membrane (12), the welding surfaces (31, 32) to be joined are either melted by open flames from, for example, a gas burner or using hot air. Both open flames and hot air lead to an uncontrolled melting of the welding surfaces (31, 32). In addition, open flames can cause something catching fire. During adhesive bonding, protective films must previously be removed by hand from the adhesive layers. The invention provides for the welding surfaces (31, 32) of the underlayment membrane (12) and of the overlayment membrane (13) to be melted by infrared emitters (27) using in particular short-wave infrared beams. The infrared emitters (27) permit controlled and uniform melting of the welding surfaces (31, 32) over their entire width, which leads to homogeneous welding. In addition, no risk of fire is associated with the infrared emitters (27). During adhesive bonding of an overlayment membrane (13) to an underlayment membrane (12), the protective films are previously melted away by the infrared emitter (27).
|
