The JKY/JKB/JKR series are advanced twin-stage vacuum extruder which draw lessons from the developed domestic, abroad experiences and design to make. They are mainly made of high quality steel with features of reasonable structure, sturdy and durability. And they have strong applicability, high efficiency, easy maintenance but lower energy consumption. The machine's axles, gear and other important spare parts extend the service life which are made by carbon steel and alloy steel through modulation or quench's heat treatment procession.