Abstract: A method for the welding of plastic materials in the form of webs, films or the like by means of a heating wedge, welding being carried out without the use of a second pressure roller below the welded material webs. For this purpose, the heating wedge is placed onto the lower material web and is moved over the latter under pressure. The pressure is generated via a holding-down device which has a holding-down roller and which presses onto the upper material web and onto the heating wedge. A floating mounting for the heating wedge compensates for slight unevennesses on the lower material web.

Abstract: An automatic welding machine for planar plastic materials, such as sealing sheets, tarpaulins or films, the chassis, in the welding position, in addition to being carried by the driving unit and the pressure device, also being carried by a rigid guide wheel, preferably in the front region of the chassis. With respect to a pressure roller running essentially on the welded overlap region, the guide wheel is arranged in such a way that, during the welding, it runs along the bottom plastic material parallel to the edge of the top plastic material. In addition, the guide wheel has a narrow running surface. During the welding, the guide wheel runs along the edge of the overlapping plastic material and the pressure roller runs essentially on the weld region. Due to this configuration, the automatic welding machine can follow the edge in such a way as to keep to the track, so that guidance by the operator or frequent corrections of the welding direction are not necessary.

Abstract: A method for the welding of plastic materials in the form of webs, films or the like by means of a heating wedge, welding being carried out without the use of a second pressure roller below the welded material webs. For this purpose, the heating wedge is placed onto the lower material web and is moved over the latter under pressure. The pressure is generated via a holding-down device which has a holding-down roller and which presses onto the upper material web and onto the heating wedge. A floating mounting for the heating wedge compensates for slight unevennesses on the lower material web.

Abstract: Drive device for a handheld heater unit for welding plastic sealing webs and sheets, which is equipped with a heater device for heating the plastic sealing webs and sheets which are to be welded. The drive device has an elongate housing with a pressure-exerting and driving roller, by means of which the joining force can be applied in the vertical direction with respect to the plastic sealing webs and sheets. Furthermore, there is a coupling unit for joining the housing to the heater unit, in such a manner that the longitudinal axes of the housing and of the heater unit run substantially parallel to one another. In the housing there is a motor, which drives the pressure-exerting and driving roller, the height and/or distance of which with respect to the heater device is adjustable.

Abstract: Drive device for a handheld heater unit for welding plastic sealing webs and sheets, which is equipped with a heater device for heating the plastic sealing webs and sheets which are to be welded. The drive device has an elongate housing with a pressure-exerting and driving roller, by means of which the joining force can be applied in the vertical direction with respect to the plastic sealing webs and sheets. Furthermore, there is a coupling unit for joining the housing to the heater unit, in such a manner that the longitudinal axes of the housing and of the heater unit run substantially parallel to one another. In the housing there is a motor, which drives the pressure-exerting and driving roller, the height and/or distance of which with respect to the heater device is adjustable.