Silicone screw compression ratio is large, generally in the 2-2.5 or so, rubber screw compression ratio is small, hot feed screw is generally in the 1.3-1.4 or so, cold feed screw is generally in the 1.7-1.8 or so. At the same time, the silicone extruder is equipped with a forced feeding device to help silicone eat material.