It is a process of degreasing and removing of minor mineral impurity e.g. sand. Wool yarns just after shaving contain considerable amount of concurrent substances which are necessary to remove in order to make textice processing possible e.g. varn producing.
There are the following wool impurities; grease, dirt and sweat remains. Impurities are removed during the basic wool washing, that takes place in 5 washing tanks in turns applying detergents,
washing agents as: potash sft soap, soda and proper washing temperature (40o-65oC) and appropriate drying temperature
are essential. Average efficiency of washing domestic and imported wool is between 35 and 65%.