... surface and thrust block design. ZLYJ Gearbox for Plastic Extruder,gearbox for extruder machine,gear box SpecificationsZLYJ series speed reducer is a ... hard gear surface and thrust block designed for plastic screw extruder. The design of product adapts all kinds of norm specified ... transmission, low noise, high efficiency, etc. ZLYJ Gearbox for Plastic Extruder