The screw and barrel rarely cause degradation, though vents or complex mixing or barrier sections may do so.
螺杆和机筒罕有引起降解的，尽管排气口或复杂的混合段或复杂的屏障段的确会引起降解。
2
The optimal design of Moddock barrier mixing element on extruder screw was investigated.
研究挤出机螺杆直槽式屏障混炼元件的优化设计问题。
3
The plastics engineers were in a constant effort to improve the distributive and dispersive mixing performance of the single screw extruder for many years.