Below Pipe making machine is used to make 3 layer PP soundproof drainage pipes. The popular soundproof pipe diameter is from 50-200mm. The pipe is made by co-extrusion technology with at least two extruders. The inner and outer layer is a thin PP layer, and middle layer is a special modified sound absorbing material. The Pipe structure is 3 layer, with thickness ratio is 10%:80%:10%.