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1·Consequently it is difficult to optimize the welding pressure in pressure constant mode used in conventional ultrasonic plastic welder.

传统焊机的压力不变模式使得焊接工艺很难优化。

2·Bief introduction to the application of frequency instrument in traditional and remade saving Energy Plastic welder and some Analysis and comparison have been done to it as well.

介绍了变频器在传统注塑机上节能改造的应用情况，并进行了方案分析和比较。