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聚丙烯采用水下切粒时，从模孔挤出的熔融柱状树脂条受水、切刀等作用，易被带入切割面与模板间形成块料进而导致垫刀等。树脂流动性能越好，其切粒受影响的程度越大。切粒还受到切刀转速和负荷的影响。 保证切刀锋利度及与模板间良好的贴合，适当降低温度，调整负荷和转速比，是水下切粒特别是生产高熔融指数产品的关键。提高物料熔体的稳定性，匹配合适切刀工艺可以有效额减少料块以及不良品的产生。“,”When polypropylene is pelletized under water, the molten columnar resin strip extruded from the die hole is affected by the action of water, cutting knife, etc., and it is easy to be taken between the cutting surface and the template to form a block, which causes the knife to be cushioned. The better the resin flow properties, the greater the impact of its pelletizing. Pellets are also affected by the speed and load of the cutter. Ensuring the sharpness of the cutter and good adhesion with the template, appropriately reducing the temperature, adjusting the load and speed ratio, are the keys to underwater pelletizing, especially the production of high melt index products. Improving the stability of the material melt and matching the appropriate cutting process can effectively reduce the occurrence of material lumps and defective products.