Qingdao Zhonghuayu Plastic Machinery Co. Ltd. seals HDPE One step method polyurethane heat preservation pipe production line Qingdao Zhonghuayu Plastic Machinery Co. Ltd. is the science and technology-concentrated manufacturer professionally engaging in fabrication of plastics processing equipment sets and various plastic moulds of piping and integrating scientific research, development, fabrication, sale and service.we have about plastics process and plastics machinery guarantee high quality and high function of plastics machines fabricated by our company. Principal products: Plastic Machinery,extruder,plastic extruder,Plastic pipeline extruding production line,Plastic panel, sheet material and netting production line,Plastic extruding pelletizing unit,Plastic foaming packing machine,Extruder series,Plastic mixer, crusher, flour mill,Vacuum sizing mill, towing attachment, cutting unit,Extruding Matrix