A new process has been developed for the removal of wool from sheepskin pieces, which has considerable advantages over the pie process. The wool is slightly loosened and the skin toughened by immersion in hot water for a few minutes, and a specially designed roller strips the wool from the skin. A commercial machine using this principle has been designed, and 7 years' commercial experience of the process has been obtained.Nearly 200 samples of wool have been examined from machines operated under commercial conditions, using adequate safeguards against undue contamination of the wool with fat or with iron. It has been shown that the wool produced under these conditions is free from hazards of spontaneous ignition in commerce.A simple method has been demonstrated for predicting the commercial hazards of spontaneous ignition, by calculating the temperature distribution to be expected through bales of self‐heated wool from the results of smaller‐scale experiments.
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