In recent years, the wide application of fine special fibers has adapted to the trend of fiber development. Different from conventional chemical fibers, fine special fibers have fine linear density and large surface area. The hygroscopicity and air permeability of the fabric have been greatly improved, even far better than cotton fibers. Fine fiber fabrics are thin, soft, smooth and have good drape, making them very suitable for making lightweight underwear and high-end fabrics such as suede. Because fine special fibers have characteristics beyond ordinary chemical fibers, they are favored by powerful cotton spinning companies for developing new products, expanding markets, and improving corporate competitiveness.
However, due to the limited structure of the fine differentiated fiber itself, its spinnability is poor, and problems such as tangled flowers, cotton web loss, static electricity, and fiber damage are prone to occur during the carding process. In order to solve these problems, in addition to adding an appropriate amount of oil and adopting enlarged carding distance, light quantity, and low speed technology, it is also critical to optimize the carding equipment and configure it rationally.
Sorting out problems and analyzing their causes
Fine fibers have low rigidity and large bending deflection, and are easily entangled with cylinder card clothing during the carding process. In addition, due to the increase in surface area per unit mass, the probability of friction between fibers and between fibers and card clothing increases, resulting in a sharp increase in static charges and a sharp increase in the transfer rate between fibers. Decrease, resulting in deterioration of card sliver quality and increase of neps and cotton balls in the cotton web.
The cohesion of fine fibers is poor, and cotton nets are prone to problems such as broken edges, messy netting, and netting.
The breaking strength of fine fibers is much smaller than that of conventional fibers, and they are easily deformed and broken to produce short lint, which not only affects the strength of the yarn, but also increases the hairiness and neps of the yarn, making evenness worse.
technical measures
To address the problem of static electricity in fine fibers, the raw materials should first be pre-treated, such as adding an appropriate amount of water and antistatic agents, and placing them in equilibrium under production conditions for more than 24 hours. The fine fibers are thin and long, have strong pulse carding force, and are easy to get clogged. In order to ensure sufficient carding and minimize fiber damage, cylinder card clothing must meet a certain tooth density, and the surface roughness and sharpness of the teeth should meet Require.
Due to the high length consistency of chemical fibers, there are basically no impurities except for a small amount of hard filaments, parallel filaments and rubber blocks. In order to reduce short lint during the carding process, the speed of the cylinder and licker-in should be set low.
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