Extruders - A Special Supplement from Rubber & Tyre Machinery World
Rubber extruders have a varied field of application. So, when you come across a rubber profile, strip, hose, cable, wire, cord coating, tire tread, v-belt, tube, or blank remember that they are only a few handful of products manufactured using extrusion process. In this Knowledge On-The-Go Special Supplement, we bring to you a ‘collector’s edition’ on Extruders and Extrusion incorporating the fundamentals.
Rubber extruders have a varied field of application. So, when you come across a rubber profile, strip, hose, cable, wire, cord coating, tire tread, v-belt, tube, or blank remember that they are only a few handful of products manufactured using extrusion process. In this Knowledge On-The-Go Special Supplement, we bring to you a ‘collector’s edition’ on Extruders and Extrusion incorporating the fundamentals.
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| EXTRUDERS |<br />
A Screw Extruder consists of five<br />
components viz.<br />
(a) Drive system<br />
(b) A feed hopper<br />
(c) A screw rotating within<br />
(d) A barrel<br />
(e) A head and die.<br />
The basic principle is that the screw carries<br />
material <strong>from</strong> the feed hopper by acting as a<br />
conveyor or a hump providing pressure to<br />
extrude or force the material along the<br />
machine barrel through the head and the<br />
die.<br />
The extruder drive system comprises of an<br />
AC or DC motor along with a reduction gear<br />
The basic principle is that the<br />
screw carries material <strong>from</strong> the<br />
feed hopper by acting as a<br />
conveyor.<br />
unit for power transmission. The extruder<br />
drive has to turn the screw at the desired<br />
speed. It should be able to maintain a<br />
constant screw speed because variations in<br />
screw speed will result in throughput<br />
fluctuation, which in turn will vary the<br />
dimensions of the extrudate.<br />
The purpose of the feed hopper is to receive<br />
material and pass it down to the flights of<br />
the screw. It is mostly supplied in the form<br />
of strip.<br />
8<br />
Image of A Screw Type Cold Feed Extruder - Pelmar Engineering Ltd.<br />
<strong>Rubber</strong> & <strong>Tyre</strong> <strong>Machinery</strong> <strong>World</strong> | FEB 2016
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