â?¢ Main Applications: 1, building hot and cold water systems, including central heating systems; 2, building heating system, including floor, wall and radiant heating systems; 3, can be directly used in purified water drinking water supply systems; 4, Central (concentration) air conditioning systems; 5, transfer or discharge of chemical media, such as industrial piping system. plastic water pipe making machine plastic ppr pipe making machines â?¢ Process flow: Raw material + additive â?? Mixing â?? Vacuum feeder â?? Hopper dryer â?? Single screw extruder â?? Color code extruder â?? Mould and Calibrator â?? Vacuum forming machine â?? Cooling tank â?? Haul-off machine â?? Cutting machine â?? Tipping table