The success of Asian spinning mills depends more and more on the quality of their product. Only if they reach world class quality level will they be able to maintain or perhaps expand their exports. In these circumstances substantial investments have been made in order to improve the quality of the yarn produced. One of the most important measures taken is the purchase of systems to reduce foreign contamination to the absolute minimum. This is particularly necessary since the contamination present in raw cotton sometimes is quite high. Two solutions are proposed to fight contamination in raw cotton once it has arrived in the spinning mills and has to be processed: Removal systems (sorting machines) in the blow room and electronic yarn clearers equipped with the appropriate FF (Foreign Fibre) channel. Removal systems in the blow room line focus on the bulk of the contamination. Such systems are not designed to detect and remove small particles (in the range of several millimetres such as individual fibres). The removal of such parts is the task of yarn clearers.
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