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RESEARCH PAPERS: Papers on Production Engineering

The Effect of Metered Starve Feeding on the Performance of a Small Extruder

[+] Author and Article Information
D. P. Isherwood, R. N. Pieris, J. Kassatly

Department of Mechanical Engineering, Imperial College of Science and Technology, South Kensington, London SW7 2BX, England

J. Eng. Ind 106(2), 132-136 (May 01, 1984) (5 pages) doi:10.1115/1.3185923 History: Received October 18, 1983; Online July 30, 2009

Abstract

Experiments have been carried out on a 38-mm diameter single screw extruder in which the machine was fed at a controlled rate below its capacity (the starve fed mode). It was found that, for three different polymers in granular form, the die pressure fluctuations and specific power consumption reduced for limited amounts of starvation and these improvements were associated with a smoother melting profile. Melt initiation was delayed but once it had started subsequent melting was rapid. Higher levels of starvation with granules and also modest degrees of starvation of a polyethylene powder had deleterious effects. The observed behavior is discussed in terms of the increased solid bed mobility allowed by the loosely packed material in the screw channel.

Copyright © 1984 by ASME
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