定刀

定刀是聚合物造粒切粒机中精密设计的固定刀片组件，提供与旋转刀片剪切挤出聚合物料条的对应切割面。它平行安装于切粒转子，并保持关键间隙公差，以确保清洁、一致的颗粒切割，无变形或拉丝。该组件对于实现均匀颗粒几何形状、长度控制以及塑料配混和回收操作中的生产效率至关重要。

定刀基于剪切切割原理工作，挤出聚合物料条在固定定刀和旋转切刀之间送入。当旋转刀片经过固定定刀边缘时，产生剪刀式剪切作用，将塑料料条干净地切割成精确颗粒。定刀的位置和角度可调，以保持与旋转刀片的最佳间隙（通常为0.05-0.15mm），确保高效切割，同时避免过度摩擦或刀片磨损。

The bed knife operates on the shear-cutting principle where extruded polymer strands are fed between the stationary bed knife and rotating cutter blades. As the rotating blades pass the fixed bed knife edge, they create a scissor-like shearing action that cleanly cuts the plastic strands into precise pellets. The bed knife's position and angle are adjustable to maintain optimal clearance (typically 0.05-0.15mm) with the rotating blades, ensuring efficient cutting without excessive friction or blade wear.