... feeder, single screw extruder, smaller single screw extruder for extruding the mark line, mould, vacuum calibration tank, spray cooling tank, Two Caterpillar ... the operation very convenient. The line can be equipped with another extruder used for extruding the mark line. THREE.Main advantages: 1. Single ... 65-68, which can has a long life. HDPE pipe extruding line