planetary extruder screw in high wearing and super wearing,service in long life, ... product is HT seriers planet extruder,such as HT140,HT170,HT190,HT200,HT220,HT240 and HT250. The screw rod are in long ... replaced with three imported major components. Planetary extruder is different with single-screw and double-screw extruder,there are more than 6 screws in ...