This is a review article on the paste extrusion of polytetrafluoroethylene (PTFE). The article begins with an overall presentation of the process. Important aspects related to this process are the physical properties of PTFE, its rheology, the morphological changes occurring during flow (fibrillation) that play a critical role on the dimensional stability of the final products, the geometrical characteristics, and types of dies used and temperature. PTFE is a compressible, zero Poisson's ratio material, and the mechanical properties of extrudates after extrusion are also discussed in view of fibrillation and Poisson's ratio.

中文翻译：

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聚四氟乙烯（PTFE）糊料的流变和加工

这是一篇有关聚四氟乙烯（PTFE）糊料挤出的评论文章。本文从整个过程介绍开始。与该过程相关的重要方面是PTFE的物理性能，流变学，流动（原纤化）过程中发生的形态变化，这些变化对最终产品的尺寸稳定性，几何特性以及所用模具的类型和温度起着至关重要的作用。 。PTFE是一种可压缩的零泊松比材料，并且还从原纤化和泊松比的角度讨论了挤出后挤出物的机械性能。