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  • 2.4.5-COTTON VALUE ADDITION-ELECTRONIC GADGETS IN THE SPINNING PROCESS FOR REMOVAL OF CONTAMINATION

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  • Electronic gadgets in the spinning process for removal of contamination

    Chapter 2 - Cotton value addition - Extraneous contamination in cotton 

     
     
    Spinners are forced to take action to minimize the problem by using electronic gadgets in the blow room and in winding. High investments are needed for installing these electronic gadgets, and highly skilled professionals are needed to handle and monitor them. When these gadgets fail or when their sensitivity changes, the results are disastrous. There are limitations to electronic detection as it depends on the speed of the process and the buoyancy, size and colour shade of contaminants. Full removal of contamination is not possible even if both blow room equipment and winding clearers are used.

    Blow room

    Anti-contamination gadgets fitted to the blow room line are helpful in early detection of large contaminants, thereby preventing them being pulverized in later processes. However, contaminants below a certain size (1 sq. cm) cannot be detected, and the majority of contaminants present in raw cotton bales are already below this size. Normally, about 60%–65% of contaminants can be removed with these gadgets in the blow room. Single fibre contaminants such as hair, fragmented feathers or tiny polypropylene fibres escape detection.

    Winding

    Finer contaminants are removed to the tune of 80%–85% in the winding process, at the cost of a significant drop in efficiency of winding and increased joints or weak points in the yarn. However, fibrous contaminants below 1 cm and with less 5% darker than the cotton cannot be removed. Most fine hairs and fine polypropylene fibres still pass though and are present in the yarn.