同向旋转和反向旋转双螺杆挤出机都合成了乙烯基并制成乙烯基最终产品。因为它们的熔融模量可能很高，热稳定性可能很低，所以乙烯基通常以比聚烯烃更低的螺杆速度加工。当经典的双螺杆挤出机在高螺杆速度下加工乙烯基时，它们往往会产生不必要的粘性加热，比低粘度聚合物产生的粘性加热更多。这在一定程度上是传统螺丝钉学科的缺陷，这种学科已经普遍存在。本文介绍了使双螺杆挤出机更有效地工作的方法，以允许更高的螺杆速度和吞吐量，无论是在复合、成品挤出还是两者的混合物中。

Both co-rotating and counter-rotating twin-screw extruders have compounded vinyls and made vinyl end products. Because their melt moduli can be high and their heat stability can be low vinyls are generally processed at lower screw speeds than polyolefins, for example. When classical twin-screw extruders process vinyls at high screw speeds they tend to generate unwanted viscous heating, more than they do with lower viscosity polymers. This is partly the fault of the classical screws discipline which has been generally available. This paper introduces approaches to making twin extruders do their jobs more efficiently to permit higher screw speeds and throughputs, whether in compounding, finished product extrusion or a mixture of the two.