[Spinning knowledge] What are the reasons for the formation of neps in the spinning process? The amount of neps in the yarn not only affects the appearance quality of the yarn and the grey fabric, but also directly affects the dyeing effect of the fabric and causes dyeing. As the quality of the appearance of the textile is higher and higher, the nep has been listed as important. The point of control. Causes of nep formation: Baby Quilt Products,Anti Allergy Baby Quilt,Cotton Baby Quilt,Baby Small Quilts USHARE INDUSTRIAL (DONGGUAN)CO.,LTD , https://www.usharedg.com
1. There are many harvesting methods for cotton to produce neps impurities in raw cotton. At present, harvesting methods are roughly divided into manual picking and mechanical harvesting methods. Foreign artificial harvesting methods are mainly used for picking long-staple cotton and fine-staple cotton. Mainly mechanized harvesting, mechanical harvesting brings a lot of impurities to the lint, and even a small amount of neps, which makes it difficult for the ginning factory to remove impurities, and also causes a certain amount of neps in the raw cotton after ginning.
2. It is contradictory to remove the impurities in the raw cotton and increase the neps and short velvet in the production of clean cotton. The faster the speed of the beating parts of the cotton cleaning, the better the impurities are removed, and the longer the process of increasing the opening of the cotton production line, the cotton The more the knot is added. Therefore, we must strive to open a short process of the cotton production line, optimize the process technology of removing impurities and producing neps, and strive to increase the number of neps and short piles in the open cotton.
3. The greater the proportion of immature fibers in raw cotton, the more chances of producing neps and short velvet. Try to control the distribution of immature fibers before the raw cotton enters the open cotton production line, and reduce the immature fibers in the blended cotton. The proportion and difference in the middle.
4, the card is the main process to reduce the neps, many neps can be combed or removed on the card, therefore, the card to do four fast and accurate, to strengthen the comb, especially the cover and cylinder The carding action between the two should be strengthened. The new carding machine is equipped with a fixed cover plate, which improves the cleaning function and the carding effect of the feeding part, which is very important for reducing the neps.
5. On-line and off-line monitoring and control of cotton neps in raw cotton, so that the increase in the number of neps in production is controlled. The AFis raw cotton property tester can check the percentage of immature fiber and the total amount of neps in the raw cotton. The specified indicators should be eliminated, so that the number of nep can be controlled in the process of opening and combing. New carding machines such as DK803, DK903, DC03, etc. can also detect the dynamic changes of the neps online, which can be increased according to the increase of neps. Limit the situation alarm, automatically adjust the cover and the cylinder spacer, automatically grind the cover to stabilize the product quality.