The conical twin screw is specially used for the extruder,matching with different standard of pipe die and auxiliary device,it is used to extrude PVC pipe,foaming and spiral pipe,etc.It adopts vacuum calibrating,water spraying cooling,pedrail hauling,automatic cutting and material discharging.Features of the production line:automatic temperature controlling,stable peroormance,and easy operation.It shall be the first choice for PVC pipe production.