The object of the spinning process is to produce thread shaped structure with constant number of fibers in its cross section over the entire length.
The conditions of Spinning process and the variation associated with the raw materials there will be a random variation the yarn mass. The variation is the mass classified in to frequentlyoccurring and seldom-occurring faults.
Frequently-occurring yarn faults are thin places, thick places and Neps which are detected as imperfections with evenness testing equipment for 1KM (1000Mtrs).
Samples of the opening and cleaning line should be collected in the ductwork leaving each critical piece of cleaning equipment.
Samples should be taken while at a normal flow rate. For safety reasons, machine manufacturer’s recommendations have to be followed for sample collection.
Samples should not be collected from inside or at the bottom of a machine, where excessive trash and foreign matter is accumulated. This can bias the test results, since the sample does not represent the regular cotton after cleaning