Organic and inorganic impurities


On the one hand, these are residues of cotton packaging (jute, polypropylene, etc.) that get into the fiber material due to careless removal during bale feeding. However, more and more impurities, e.g. remains of plastic sacks and other refuse, are already getting into the fibrous material during harvesting in the cotton fields. These impurities and packaging residues are reduced in size by the various opening units in the blowroom and carding room to such an extent that it may no longer be possible to remove them. These impurities either result in ends down on the spinning machine, which is the lesser evil, or they are spun into the yarn, with much more serious consequences. Extraneous fibers (e.g. jute in the case of cotton) usually display a different dyeing behavior from the original fibers. However, since the extraneous fibers are also usually distributed over long lengths of yarn, this leads to a drastic reduction in the value of the fabric produced. Increasing numbers of monitoring systems are therefore being used on rotor spinning machines to detect and eliminate these impurities.