·The screw length-diameter ratio is 12:1, the plasticization is sufficient, and the extrusion product has good density ·The screw type is single head thread unequal distance unequal depth type, compression ratio of 1:2.5, can be well extruded 30-90 degrees of various soft and hard silicone rubber ·The front of the screw is provided with a filter plate, which can be placed in order to reduce the impurities of the rubber material, and can make the rubber material move in a straight line, which greatly improves the uniformity and fluidity of the rubber material ·Using variable frequency motor or servo motor, the machine's high and low speed operation, control ability are very stable and accurate