... wall spiral pipe, inner wall hollow pipe, and core layer foam pipe-etc.It consists mainly of single screw extruder ... includes two-claw type, three-claw type, four-claw type, six-claw type, eight-claw type, ten-claw type, twelve-claw type-etc.No-scraps ... advanced level.The property of machine group is reliable, the production efficiency is high. Warmly welcome you to seclet PE pipe production line.