How is HDPE pipe made

We focus on to reduce the cost of HDPE Pipe production,it is easy to made hdpe pipe now,but not easy to reduce the machine cost and pipe cost,not easy to increase the surface light of pipe and manning rate.

Below is process of HDPE Pipe extrusion:

Feeding--Melting--Extrusion--Molding--Calibration--Cooling--Cutting/Coiling--Package.