Abstract
Practical stock‐dyeing trials using different liquor pressures and temperatures have confirmed that fibre damage is greater when the pressure is high. The effect was shown clearly by the differences found in the strength of fibre bundles and in yarn extensibility. Processing efficiency might also be expected to be affected and in fact variations in the amount of carding waste were found which correlated with fibre strength. It appears to be practicable to operate a dyeing machine at a lower pressure (and temperature) without Joss of production or dyeing efficiency. Suitable means of achieving this have been devised leading to less damage to the wool and so to substantial savings in subsequent processing.
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