Pvc window machinery plastic welding for pvc. Welding for semi-finished plastic materials is described in ISO 472 as a process of uniting softened surfaces of materials, generally with the aid of heat (except solvent welding) between 220 and 250 degree temperature. Welding of thermoplastics is accomplished in three sequential stages, namely surface preparation, application of heat and pressure, and cooling. Numerous welding methods have been developed for the joining of semifinished plastic materials. Based on the mechanism of heat generation at the welding interface, welding methods for thermoplastics can be classified as external and internal heating methods. After heating there is a cooling process of the pvc matarieal
