Oct '17
The classic manual method of count measurement requires two instruments: a yarn reel and a balance. The procedure is slow, labour-intensive and subject to human error. The automatic option, using the Uster Tester 6 with the Sensor FA for automatic fineness, is fast – with testing speeds of 800 m/min. It also needs only one operator and there is no risk of human error. These advantages of automatic count measurement are immense, but the accuracy of the results is the all-important issue. This was the challenge taken up at two spinning mills.
Wolfram Soell, textile technologist within Uster Technologies executed the trial on the accuracy of the Uster Tester 6 in a spinning mill in Europe. This customer has a reference yarn, which was tested every week for a long-term observation of the yarn count accuracy in the mill’s laboratory. The trial ran from January to August 2017, and during the first month the tests were carried out at speeds of both 400 m/min and 800 m/min. It was quickly seen that the measurement results were independent of the testing speed, so the tests continued only at 800 m/min. During the testing period, results for the 100 per cent combed cotton Ne 30 ring yarn showed minimal variation.
Expert analysis of these results demonstrated the excellent accuracy of the Sensor FA for yarn count measurement. The ideal proof of its reliable accuracy, however, would come from a direct comparison with the standard manual method. With respect to count variation, the Sensor FA had much lower variation than the standard method in almost every test.
All the parties involved were well satisfied with the conduct and outcome of these trials. The spinners in the trials appreciated the integration of international standards for selection of the predefined yarn length for the tests. This ensured the most accurate yarn count determination, without error-prone human interaction, while also giving the option of customised setting of the predefined yarn length. (GK)
Fibre2Fashion News Desk – India
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