水辅助注射成型制品缺陷机理

Mechanism for Product Defects in Water-Assisted Injection Molding

水辅助注射成型是生产中空塑料制品的新方法,具有制品质量更轻、壁厚更均匀以及成型周期更短等优点.由于新的工艺参数的引入,制品质量变得更加难以控制,容易产生一系列的制品缺陷问题.归纳总结了水辅助注射成型的主要制品质量缺陷问题,如不规则残留壁厚、指形化和空心孔等,对这些缺陷问题进行了机理分析.此外,从聚合物的材料特性、制品的结构尺寸,以及成型工艺参数等方面提出了避免缺陷的改进措施及方法.

Water-assisted injection molding is a new way to produce hollowed plastics products with the advantages of lighter quality,more uniform wall thickness and shorter molding cycle. For the introduction of new processing parameters,it is more difficult to control product quality and easier to cause a series of product defects. The main product defects were summarized,such as irregular residual wall thickness,fingering,void and double wall thickness,and the mechanism of product defects were analysed. Furthermore,the ways of avoiding defects were suggested by material characteristic of polymer,structure and dimension of product, and molding processing parameters.