Because in the solid transportation part of the conical twin-screw extruder materials processed are in the forms of incompact grain.So our first study is to confirm its physical character.

• 利用该透明机筒进行不同条件下的物料输送实验，观察到物料在该段运动情况，并对其运动进行了分析，提出临界充满度和临界角的概念，对固体输送角进行了推导。