Flow Analysis in an Internal Mixer: Part II: Estimation of Mixing Efficiency by Batch Homogenization Time

K. Kawanishi; K. Yagii

doi:10.3139/217.900173

Article

Flow Analysis in an Internal Mixer

Part II: Estimation of Mixing Efficiency by Batch Homogenization Time

K. Kawanishi and K. Yagii

Published/Copyright: May 27, 2013

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From the journal International Polymer Processing Volume 5 Issue 3

Abstract

A modified laboratory mixer (Banbury-type; batch volume is 250 cm³) with transparent front windows was used to observe the flow of silicone rubber. A pair of specially designed rotors was used in order to estimate the influence of rotor design upon the behavior of silicone rubber. Five parameters were picked up in designing the rotors. The rotor consists of a number of thin plates of identical shape. The plates are designed so that they can construct a double-winged rotor. By assembling the plates properly, the angles of twist of longer and shorter wings and lengths of wings can be varied, i. e. the overlap ratio of longer and shorter wings can be controlled. The rotor tip clearance is also variable. Batch homogenization times were measured with torque and unit-work for all experiments, observing the flow of silicone rubber through the front window at the same time. The torque and unit-work increase as rotor tip clearance decreased and as overlap ratio of wings increased. The twist angle of wings had little influence on torque and unit-work. The batch homogenization time became shorter with increases of rotor tip clearance, overlap ratio of wings and twist angle of wings and with the decrease of rotational speed ratio.

* Mail address: Dr. K. Kawanishi, Development Center, Japan Synthetic Rubber Co. Ltd. Yokkaichi, Mie 510, Japan.

Published Online: 2013-05-27

Published in Print: 1990-09-01

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https://doi.org/10.3139/217.900173