And this high efficiency stick flexible material can absorb the noise and ensure high efficiency extruding output and extruder's wearable and long life as well.
FRIEND Company has the patent for adjustable co-extrusion die head, which has the below excellence : ensure three layers PP material well mixed and good melting rapidly;  It can save time ; each layer thickness can be adjusted according to demands freely; no need adjust the extruder speed.
The out layer and inner layer is PP material and core layer is foamed .The pipe production characteristic is excellence than the Casting Iran pipe and even beyond the UPVC drainage pipe. noise <45dB , PP pipe has the anti-flexible strength , no change the pipe shape for hot temperature . Wearable & long life.