Process Flow: Raw material+master batches--mixing--vacuum feeding--material dryness--single screw extruder--co-extrusion mould--calibrator--spray vacuum calibration tank--spray cooling water tank--belt haul-off--single screw glue extruder--winder--winding roller forming--water cooler--cutter--pipe rack--finished product inspecting&packing Design Purpose: High speed and high efficiency extrusion on the basis of high quality; Low cost and high profit; Purpose is create value for our customers. Function and Characteristics: Main machine: Adopting two steps type decompression screw, with specially mixing and plasticization component, together with high twist torque and high temperature control accuracy make 90% of recovery material can be used in production. Composite die: Adopting composite die, two extruders unite to provide material, helix turning forming, high efficiency compound technology ensures high product quality.