介绍用聚氨酯橡胶做定心夹具，克服普通心轴定心夹具的缺点，加工制造容易，精度高，便于实际应用。
Introduces a new automatic centering fixture, which eliminates traditional fixture's shortcomings. It has higher precision and it's easy to be produced and applied in practice.
在模具纹路加工中，传统的化学蚀刻方法存在污染大、加工周期长的缺点。
In the processing of the mold texture, the traditional chemical etching exits the shortcomings of the pollution and the long processing cycle.
针对高聚合度聚氯乙烯加工性能较差的缺点，综述了改进其加工性能的化学和物理方法。
In connection with the poor processibility of high polymerization degree poly (vinyl chloride), chemical and physical methods for improving its processibility were reviewed in this paper.
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