Compression Ratio

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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.

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