Raw materials
During the raw cotton picking and processing process, the increase in machine-picked cotton results in an increase in short lint and neps.
Equipment
The equipment is repeatedly rubbed and struck during the processing, and abnormal extrusion causes The increase of neps and short lint, especially the irregularity of some attack points, will lead to a sharp increase.
Card clothing
The card clothing penetrates into the fiber bundles and is repeatedly carded, transferred, and rubbed. , Improper needle matching will cause an increase in neps and short lint, and the biggest hazard is potential fiber damage.
Technology
Improper process configuration of carding machine can also cause fiber damage, tight gauge, Strong carding causes the contradiction between combing out neps and increasing short lint; low speed causes the contradiction between protecting fibers and not combing out neps. These are all solved by technology. During the carding process, the smaller the distance between the two needles and the tooth surface, and the denser the needle teeth, the stronger the gripping force on the fiber; the poor surface roughness of the needle teeth will increase the control force and intensity of the fiber, causing fiber Damage and produce lint and neps. Improper process configuration leads to an increase in neps due to insufficient carding and an increase in short lint due to excessive carding. Therefore, the main purpose of the process configuration should be to coordinate the card clothing’s flexible carding and full carding.
Management
Equipment management, that is, equipment maintenance level and maintenance quality; raw material management, that is, return The selection and equipment of flowers and materials; process management, that is, the pass rate of the process on the car; during the processing process, the temperature and humidity are low, and the moisture regain is too small. The cotton fiber is easily brittle and the moisture regain is too large, and the carding cannot be opened, resulting in an increase in neps and short lint. ; Lack of timely and incorrect cleaning during operation (blowing, beating) can easily cause short lint, and the attachment of flying flowers can also cause an increase in short lint and neps.
The hazards of neps and linters
The hazards of linters
There is a lot of short velvet, which is difficult to control during the drafting process, and the yarn strength is low; there are many fly flakes during the production process, many ends are broken, poor evenness, and the yarn has many details and slugs. There are many neps; the weaving efficiency is low and it cannot adapt to high-speed warping air jet; it increases the cost of mercerized singeing.
The harm of neps
Neps are an important indicator of yarn quality. It not only affects the appearance of yarn and fabrics, but also affects subsequent processing quality and production efficiency. There are many neps and the quality of the fabric is poor. At the same time, it will cause broken ends and broken needles in the knitting yarn, and holes in the fabric will affect the dyeing and fabric quality. </p
