COMPARATIVE INVESTIGATION ON WOOL FINENESS OF WOOL ROVING BATCHES
D. Panayotov
Abstract: In the experiments, 8 wool roving batches with total weight of 33 138 kg, produced of fine (Merino) wool in Kolhida-Siven Ltd were used. The fineness of wool in each studied batch was determined by lanameter and by Optical Fibre Diameter Analyzer (OFDA-100).
It was found out that the mean thickness of fibres in the studied wool roving batches ranged between 22.91 and 25.30 μm when measured with lanameter and between 23.03 and 26.55 μm in OFDA tests. In all studied batches, the mean thickness of fibres determined with OFDA was higher than that determined with the lanameter. According to the average thickness of fibres in lanameter tests, one of studied batches was evaluated as grade 64s, six – with grade 60s and one with grade 58s according to the Bradford system, whereas the results from OFDA tests yielded one batch with grade 64s, three with grade 60s and four – with grade 58s. Coefficients of variations of the individual wool roving batches varied within relatively narrow ranges – from 23.29 to 25.47% in lanimeter tests and from 22.20 to 25.07% in OFDA tests. For all studied batches, the relative share of fibres thicker than 30 μm exceeded the limit of 5% for fine (Merino) wool. The values of this parameter, as determined by OFDA were significantly higher for all studied batches.
It was found out that the mean thickness of fibres in the studied wool roving batches ranged between 22.91 and 25.30 μm when measured with lanameter and between 23.03 and 26.55 μm in OFDA tests. In all studied batches, the mean thickness of fibres determined with OFDA was higher than that determined with the lanameter. According to the average thickness of fibres in lanameter tests, one of studied batches was evaluated as grade 64s, six – with grade 60s and one with grade 58s according to the Bradford system, whereas the results from OFDA tests yielded one batch with grade 64s, three with grade 60s and four – with grade 58s. Coefficients of variations of the individual wool roving batches varied within relatively narrow ranges – from 23.29 to 25.47% in lanimeter tests and from 22.20 to 25.07% in OFDA tests. For all studied batches, the relative share of fibres thicker than 30 μm exceeded the limit of 5% for fine (Merino) wool. The values of this parameter, as determined by OFDA were significantly higher for all studied batches.
Keywords: coefficient of variation; prickle factor; wool: fineness
Date published: 2017-05-09
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