Single screw extruders especially used for polyolefine material possess effective plasticizing effect and high extrusion speed.The special detachment type mixing screw and the standard designed die with spiral structure&reasonable channel are applicable to produce pipes with smooth inside and outside face.Unique sizing and cooling mode is capable of producing pipe scope 50- 200mm,production speed is up to 0.6-1.5M/min http://www.sj-extrusion.com/