Abstract
The terms shrinkage, yield, and clean content are de fined. The methods of obtaining shrinkages on lots of wool are explained. The research work completed with wool shrinkage tests in the past is reviewed.
The method of selecting the sub-lot and the samples from the sub-lot is described, and the methods of scouring at the laboratory and the mill are explained. The shrink ages of the small samples are compared with those of the sub-lot and the entire lot.
The grading and sorting of the sub-lots are compared with that of the entire lots. The grading of 10 bags, of five bags, and of every nth fleece is compared to that of an entire clip.
The grading of the first bag sheared from each band is found usually to be coarser than that of the last bag sheared from each band, and the cause is explained.
Figures are given for the percentage of grease in the scoured wool. The variations in shrinkage of samples drawn by different operators, and between the first and fourth samples drawn are given, and are found not to be significant.
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