For the co-rotating twin screw extruder, the shear component of it is kneading disk.2 (diamond) disk kneaders can be used, which has strong transmission capacity but not very strong shear capacity. At the same time it can reduce the shear by reducing the thickness of kneading disc and increasing the wrong angle of kneading block.

Some factories of foreign counties have designed a non-mating-type mixing elements called “multiple processing units” in screws. These elements can be used with the retro directive component and form a mixing box. This can make the materials annular flow in part of the screw so that the capacity of distribution of mixed can be increased, and high temperature caused by the over shear of materials can be availed at the same time. Besides, temperature can be controlled through reducing shear by lower screw speed and liquid cooling of the screw in the high shear zone.

According to the research, although reducing the screw speed will reduce the production capacity of the co-rotating twin screw extruder,it can reduce the extrusion volatility so that make the surface of the extrusion products smoother.