Qingdao Haosaite Plastic Machinery Co.,Ltd specializes in manufacting PE/PVC double wall corrugated pipe line. High performance single screw extruder or twin screw extruder with special screw ensure good extrusion A high speed of production can be ensured by the corrugated forming system and forced cooling system combined with water and air cooling during constant production.The advanced programmable lubricating system decreases abrasion of mould blocks to a minimum while lengthening their lifespan and ensuring running precision and stable quality. Co-extrusion die with special structure especially for PVC extrusion makes the inner and outer walls even and forming stable. The cast mould blocks are made from special alloy for high precision and strength and excellent radiation effect.