... surface gearbox of ZLYJ series for injection mold machine Special decelerator for plastic extruderSeries ZLYJ decelerator with ... plastic extrusion machine gearbox, hard tooth gearbox, gearbox for plastic extruder, gearbox for plastic extrusion machine, plastic extruder machine, plastic extrusion ... steels for gear wheel and shaft parts. The gear is treated with carburation, quenching and gear grinding. ...