现有的塑料破碎机的切削刀具通常采用整体式、片刀式或爪刀式，这三种形式的刀具皆以间断、瞬间、大面积切割的方式对废旧塑料进行剪切式的粉碎。
The cutting tools of the existing plastic crusher usually adopt the integral, blade or claw-knife cutting tools. These three types of cutting tools all cut waste plastics in a discontinuous, instantaneous and large-area manner.
其中旋转爪刀的结构一般为：在爪刀本体中部开设带有键槽的轴心通孔，在爪刀的外侧边缘设置有一个或一队斜切状刀刃，从而将旋转爪刀固装在转轴上，并使旋转爪刀的刀刃与固定刀具相对应，从而可切割和粉碎塑料。
Among them, the structure of rotary claw knife is generally as follows: the central through hole with key groove is opened in the middle of the claw knife body, and one or a group of oblique cutting edges are arranged at the outer edge of the claw knife, so that the rotary claw knife is fixed on the rotating shaft, and the blade of the rotary claw knife corresponds to the fixed knife, so that the plastic can be cut and crushed.