... made of 1,vibrating sieve, 2,high speed mixer machine 3,cooling machine,4, plastic powder charger,5, conical double-screw extruder ... , 7,double wall accordion pipe shaper,8, plastic pipe-expanding machine, 9,pilling bin, 10,water chilling unit, 11,air compressing ... machine. It can be used to produce PVC PE plastic double-wall accordion pipes and plastic ...