... screw extruder can equipped with the Siemens PLC controlling system. PPR pipe production lineProcess flowRaw material + additive → mixing → vacuum feeding ... in clean drinking water systems. 2, thermal insulation. PPR pipe thermal conductivity coefficient of 0.21w/mk, only 1 ... own pipe. 6, recyclable materials. Waste PPR after clean, broken recycling can be used in the pipes, pipe fittings production. ...