... lines are made up of rectangular pipe extruder, extrusion welding machine, winding machine, cutting machine, and related auxiliary composition, with a ... of construction. 1.Extruders are specially designed high-performance single-screw extruder,unique screw and barrel structure, yield, ... -torque, high temperature control accuracy. 4.Composite die head, dual-plane co-material, helix turning forming,and ...