Used for overlapping welding of thermoplastic geomembrane(HDPE, LLDPE, PVC, PP etc.) with thickness ranging from 0.50mm to 3.00mm. With a welding maximum speed of 4m /min., it is also equipped with adjustable wedge temperature, speed control and pressure control. Its swivel head ensures that there is even pressure exert on the lower roller creating a double track seam which are equally strong.