Qingdao Yifeng Plastic Machinery Co., Ltd.is specialized in the design,manufacturer of Ultrasonic welding technology joint: Ultrasonic welding joint,co-extrusion forming; high intensity. Low waster ratio and easy to operation; Welder,frequency converters,temperature control instruments and PLC control component are import products; A high degree of automation, Calais PCC programmable computer control system, which can do closed loop automatic control program to extrude/pedrail speed, temperature and product diameter. Qingdao Yifeng Plastic Machinery Co., Ltd.（Website http://www.yifengjixie.com/en）Principal products:HDPE vacuum corrugated pipe unit 、HDPE carbon fiber spiral coil unit、PVC plastic hard tube extruding production line、PE large-caliber insulated pipe production line 、Plastic extruding corrugated pipe unit with single-wall、PE and PP plastic thick board (slice) extruding production line.（Website http://www.yifengjixie.com/en）