VISCOSITY CHARACTERIZATION and TRANSIENT FLOW SIMULATION and VISUALIZATION of PTFE PASTE EXTRUSION

George A. Schmidt, Yiyang Xu, Yu Jyun Lin, Lih Sheng Turng

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The shear viscosity of polytetrafluoroethylene (PTFE) paste and its flow behavior during paste extrusion were investigated. Frequency sweeps using a parallel plate rheometer were performed on compression molded samples of PTFE paste made from fine powder PTFE mixed with ethanol as a lubricant. Various grits of sandpaper were used to reduce slip of PTFE paste on the walls. A viscosity model was generated and COMSOL Multiphysics was used to create a time-dependent flow simulation of PTFE through a paste extruder. The simulated results were compared to experimental data of actual paste extrusion. Due to simplifications used in the model, the simulated extrusion pressure over time differed in both magnitude and slope when compared to the experimental data. The simulated velocity profile was compared to flow visualization experiments, showing good agreement in wider regions of the extruder. Despite these drawbacks, the experiments and simulated model provided useful information about the flow within the paste extruder.

Original languageEnglish
Title of host publicationSPE ANTEC 2020
Subtitle of host publicationThe Annual Technical Conference for Plastic Professionals
PublisherSociety of Plastics Engineers
Pages67-73
Number of pages7
ISBN (Electronic)9781713821182
StatePublished - 2020
Externally publishedYes
EventSPE ANTEC 2020: Annual Technical Conference for Plastic Professionals - Virtual, Online
Duration: 30 03 202005 05 2020

Publication series

NameAnnual Technical Conference - ANTEC, Conference Proceedings
Volume1

Conference

ConferenceSPE ANTEC 2020: Annual Technical Conference for Plastic Professionals
CityVirtual, Online
Period30/03/2005/05/20

Bibliographical note

Publisher Copyright:
© 2020 Society of Plastics Engineers. All rights reserved.

Cite this