INVESTIGATION ON TECHNOLOGICAL FEATURES OF WOOL ROVING STOCK BATCHES
Dimitar Panayotov
Abstract: The study was performed on 8 stock wool roving batches with a total weight of 33,138 kg, produced from Merino wool at the wool textile enterprise Kolhida-Sliven LTD.
The initial processing of wool (sorting and washing), the carding and wool roving making are done according to the existing technology in the enterprise. The following technological parameters were determined in all wool roving batches: moisture, residual fat, vegetable matter; fineness and length. It was found out that the moisture content of studied wool roving ranged between 15.02 and 17.56%, the residual fact content – from 0.52 to 0.64%, and vegetable matter – from 0.01 to 0.08%. The average fineness of fibres was 23.85 μm. Batch No. 0210 was the finest (22.91 μm) and the only one compliant to Bradford grade 64s. The mean values of the other batches corresponded to grade 60s, whereas batch No 0510 was at the low limit of grade 58s. The best uniformity of fibres was exhibited by batch No. 0810, with coefficient of variation 18.78%. The same batch had also the lowest relative share of fibres with thickness over 30 μm – 6.95%. The mean weighted lengths of wool in seven batches of wool roving ranged within 60.45–69.99 mm. The short fibre content in the different batches varied from 17.41 to 26.12%, whereas the mean base values – between 57.44 and 61.56%.
The initial processing of wool (sorting and washing), the carding and wool roving making are done according to the existing technology in the enterprise. The following technological parameters were determined in all wool roving batches: moisture, residual fat, vegetable matter; fineness and length. It was found out that the moisture content of studied wool roving ranged between 15.02 and 17.56%, the residual fact content – from 0.52 to 0.64%, and vegetable matter – from 0.01 to 0.08%. The average fineness of fibres was 23.85 μm. Batch No. 0210 was the finest (22.91 μm) and the only one compliant to Bradford grade 64s. The mean values of the other batches corresponded to grade 60s, whereas batch No 0510 was at the low limit of grade 58s. The best uniformity of fibres was exhibited by batch No. 0810, with coefficient of variation 18.78%. The same batch had also the lowest relative share of fibres with thickness over 30 μm – 6.95%. The mean weighted lengths of wool in seven batches of wool roving ranged within 60.45–69.99 mm. The short fibre content in the different batches varied from 17.41 to 26.12%, whereas the mean base values – between 57.44 and 61.56%.
Keywords: technological features; wool; wool roving
Date published: 2023-03-08
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