Process flow: 
Raw material+master batches--mixing--vacuum feeding--material dryness--single screw extruder--mark line extruder---mould--calibrator---vacuum spray calibration tank---spray cooling water tank---color-ribbon printer--pedrail haul-off--planetary cutter--stacker---finished product inspecting&packing 

Application: 
Water and gas supply, micro&sprinkler irrigation system, sewerage pumping and effluent disposal system. 

Properties & Advantages: 
The pipes produced by this line have excellent hardness and flexibility. Their diameters vary from 16mm to 1200mm. The line consists of control system, extruder, die, vacuum calibration unit, hauling-off and planetary cutting system and stacker. 

Two extruders are utilized in this line. The main extruder is used to extrude the large diameter pipes and the other small one is used to extrude the mark line. 

Basket or spiral type composite die is used in this line. PLC control system and large chromatic liquid crystal screen make the operation very convenient.