Carded sliver contains more short fibers and neps impurities, and the straightness, parallelism and separation of fibers are not enough, so it is difficult to meet the spinning requirements of high-grade textiles. For this reason, textiles with higher quality requirements must use yarns spun through a combed spinning system. In addition, some special-purpose yarns are mostly combed yarns.
The worsted spinning system is formed by adding a combing process between the two processes of carding and drawing in the carding spinning system. The combing process consists of a combing preparation machine and a comber. Its main functions are:https://www.coopertailor.com/products/100-cotton-print-muslin-fabric-by-...
(1) Eliminate the short staple in the sliver, improve the length uniformity of the fiber, and create conditions for improving the evenness of the yarn and improving the strength of the yarn; (2) Remove the neps and impurities contained between the fibers to improve the yarn quality. Appearance quality; (3) to further straighten, parallel and separate the fibers to improve the evenness, strength and luster of the yarn; (4) to make evenly evenly combed sliver for the next process.
After the raw sliver is combed, to exclude 42%~50% of short fibers, 50%~60% of impurities, and about 10%~20% of neps, the straightness of the fibers can be increased from about 50% to 85%~ Therefore, the combed yarn is superior to the carded yarn of the same linear density in terms of physical and mechanical properties and appearance gloss.https://www.coopertailor.com/products/print-your-own-muslin-fabric-by-th...
The noil rate of the combing process is high, and the noil contains some long fibers; at the same time, the processing cost increases due to the increase of equipment and labor in the combing process. Therefore, the selection of the combing process should comprehensively consider the technical and economic effects from the aspects of improving the yarn quality, saving cotton, and reducing costs.