It adopts efficient conic double screw extruder,ensuring efficient extruding. ● 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. ● A professional PCC (B&R, Austria) control system is adopted with 15’’ touched colour screen for high automation, reliable running and easy operation. ● It adopts a quick changing system for the mould blocks. ● The optimum design of crest provides a perfect combination of higher ring stiffness and lower unit weight. ● Long-distance communicative function can realize tele-diagnosis and maintenance. ● It is certified for CE safety system by China Quality Certification Centre.