This screw press machine is a double screw dehydrator with a fixed screw mechanism fixed to a shaft rotating at a constant speed. And a movable screw mechanism not fixed to the shaft.

The fixed screw and movable screws are formed, so that each of them causes a rotating difference. The movable screw moves forward when it rotates faster than the fixed screw and moves backward when it rotates slower. The movable screw repeats the forward and backward movements relative to the fixed screw between the vanes of the fixed screw.

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