U-PVC foam inner spiral muffle pipe production line: 1. The main machines adopt two extruders co-operation, well-developed technology prescription obtains from many years experience can cause the pipe specific gravity drop in till 0.9, and the pipe have uniform foam and high intensity. 2. Specially design co-extruding die, merely need to replace core mandrel, it may produce solid-wall pipe, solid wall inner helix pipe, foamed pipe and foam inner helix pipe. 3. By changing the die it can produce the Nanometer anti-virus PVC feeding pipe, hollow wall inner screw thread muffle pipe and multi-layer composite pipe, like PVC/ABS and so on. 4. Main technical data: Main machine type: SJSZ-65/22 SJ-SZ-51/22 Producing pipe scope: mm 16-160 Manufacture velocity: m/min 1-12 5. Application: U-PVC foam inner spiral muffle pipe is used for water drainage. As its special structure, U-PVC foam inner spiral muffle pipe can decrease the noise largely when the water flowing.