... are one of the leading ppr machine, ppr pipe machinery, ppr pipe machine, ppr pipe production line manufacturers and ... layer pipe production line is suitable to produce PPR,PP,PE,PERT,PEX,PB single-layer ... uses one or three extrudersfor co-extrusion,adopts PPR,PE or PP as main material,the middle ... efficient extruder according to the producing characteristics of PPR,PP,PE,PERT,PEX,PB,and consists ...