Causes of ineffectiveness of plastics extruder screw due to cracking are analysed, briefly intro - duces renovation by welding.
对塑料挤出机螺杆失效断裂原因进行分析，简要介绍了焊接修复情况。
2
According to the feature of the polypropylene plastics, the technical characteristics and the optimum process parameters in the process of the plastics equipment formation and welding are discussed.
根据聚丙烯塑料的特性，论述了塑料设备成型及焊接制作的工艺特点和最佳工艺参数。
3
The welding quality test and performance assessment for pipes become more and more important with the application of engineering plastics pipe.