The number of cotton nodules is an important indicator of yarn quality, which not only affects the inherent strength of the yarn, labor productivity, but also seriously affects the appearance quality of the final product. It is therefore necessary to control and reduce the number of noodles in the raw strips.
The maturity of the original cotton is good in elasticity and rigidity, and the single fiber is strong and strong. The compression and bending resistance are good in the spinning process, and the possibility of neps formed by the entanglement of the fiber during processing is small; the raw cotton short pile rate The more it is, the easier it is to spread and adhere to some parts of the channel. The more the flying flowers and the rubber ring gather, the more the yarn becomes more and more; the finer the fineness of the raw cotton, the softer the fiber, the easier it is to form a neps; The chips are also easy to form neps.
2, open the cotton process
The greater the speed of the cotton-handling machine, the greater the degree of attack, although it is conducive to the removal of impurities, but it is easy to make the cotton pipeline insufficient wind, which is not conducive to the smooth transfer of the cotton bundle, easy to cause bundles, and produce neps. In order to reduce the neps, the cleaning equipment should be five-light, two-pass, one-pass and two-sensitive, that is, the cotton or cotton channel, the corner nails, the needles, the blades and other components should be smooth; the airflow should be smooth before and after; the beater and the dust stick, the beater and The stripping knife has an accurate gauge; the shaker, mercury switch and electrical control should be sensitive.
(1) Temperature and humidity in the carding workshop. The temperature and humidity are too large, the opening is not good, and the neps are increased; if it is too small, it is easy to cause flying flowers, and the cotton knot is generated after the cotton sliver is attached. In general, the carding workshop should control the lower relative humidity, generally 55%-60%, so that the fiber releases moisture, increases the rigidity and elasticity of the fiber, reduces the friction between the fibers and the needle teeth, and the filling between the backlash.
(2) Card clothing selection. Cylinder clothing can generally choose 2525×1550 type, which is beneficial to carding and transfer of fibers; Dow clothing can generally choose 4030×1880 type, suitable tooth-toothed doffer clothing, which can improve the ability of doffer condensed fiber and improve the structure of cotton net. The cover card clothing can be selected from MCH45 type. The reasonable type of cover cloth directly affects the quality of the sliver, which can increase the grip and combing fiber capacity, and the raw neps impurities are significantly reduced.
(3) Process parameters. Appropriate cylinders, lickers, doffers and cover speeds ensure smooth fiber transfer to the cylinder and reduce the damage of the lint and fiber. The speed of the cover plate is moderately large; the speed of the doffer is too small; the interval of each component is moderately selected, which is conducive to the opening and carding of the cotton layer, increasing the grasping, stripping and transferring of the fiber and reducing the occurrence of neps. .
In addition, you should also do daily maintenance and maintenance of equipment to prevent returning flowers and hanging flowers.
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