Qingdao Yifeng Plastic Machinery Co., Ltd.is specialized in the design,manufacturer of the U-PVC core layer foamed inside spiral muffle pipe production line, 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. Specially design co-extruding die, merely need to replace core mandril, it may produce solid-wall pipe, solid wall inner helix pipe, foamed pipe and foam inner helix pipe. 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. Qingdao Yifeng Plastic Machinery Co., Ltd. principal products（Website：http://www.yifengjixie.com/en）HDPE vacuum corrugated pipe unit 、HDPE carbon fiber spiral coil unit、PVC plastic hard tube extruding production line（Website：http://www.yifengjixie.com/en）