对于成型过程的压力控制，注射成型螺杆头组件的作用非常重要。

The function of the assembling of the injection mol ding screw head is very important for pressure control during molding operations .

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进行了各种相关工艺条件对挤出造粒的影响，包括挤出速度、模头温度及螺杆形式和定型模具对挤出成型的研究；

The impact of various process conditions on extrusion and pelletizing is studied, including the change of extrusion speed, die head temperature and screw types.

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分析了双头双螺杆泵密封腔的密封原理。

The sealing principles of the twin screw pump are analyzed.

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