... :400~4500(mm) Four-head window welding machine is one of the necessary equipments processing PVC win-door, it can achieve the whole ... precision, easy operation, convenient maintenance and wide processing range. One of the machine heads can be used for welding variable ... is the ideal equipment for welding of PVC win- doors.1.Window machine is used for PVC door-window welding.2.Welding four, three,two ...