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COMPRESSION RATIO
The ratio of the feed zone channel depth to the meter
zone channel depth, referred to as "compression ratio", typically ranges from
1.5:1 to 4.5:1 for most thermoplastic materials. Most injection screws
classified as general purpose have a compression ratio of 2.5:1 to 3.0:1. Thermoset screws have a 1.0:1 ratio.
The higher the compression ratio, the greater the:
> shear
heat imparted to the resin;
> heat
uniformity of the melt;
>
potential for creating stresses in some resins;
>
energy consumption.
For further
information on Westland Corporation's patented Eagle™ Mixing Screw, go to The
"Eagle™" or
The "Barrier Eagle™ pages.
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