Scouring of raw wool

Raw wool is difficult to spin because of the natural grease/wax (yolk), large perspiration salts termed suint, acquired impurities like vegetable matters, dirt, proteinaceous contaminant layers (PCL) and wool burrs which contain hemi-cellulose 

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T. E. Thompson, The Scouring of Raw Wool in Theory and Practice, Textile Manf. Monograph No. 2, 1940. 

Figure 5-17. Scouring of raw wool in traditional scrouring machines.

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