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Mixing analysis of reactive polymer flow in conveying elements of a co-rotating twin screw extruder

✍ Scribed by David Strutt; Costas Tzoganakis; Thomas A. Duever

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
247 KB
Volume
19
Category
Article
ISSN
0730-6679

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✦ Synopsis

In this study, the finite element method was used to investigate the effects of screw speed, entering peroxide distribution, and pressure-to-drag flow ratio on the mixing characteristics of steady non-isothermal reactive flows in a forward conveying element of a self-wiping twin screw extruder. The reaction considered was the peroxide-initiated degradation of a commodity polypropylene resin. The predicted average degree-of-freedom profiles from the simulations largely conformed to expectations. The average flow efficiencies for all runs were found to remain at values close to that for two-dimensional flow, with fluctuations being observed in the channel intermeshing regions. No significant effect of either screw speed or peroxide distribution was found on the flow efficiencies; however, the pressure-to-drag flow ratio was found to have a significant influence.

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