Factors affecting the yarn strength of textile fabrics
Textile fabric yarn strong functional fabric
1. The influence of fiber raw materials on yarn strength. The longer the fiber length, the better the fiber uniformity, the higher the yarn strength, and the smaller the strength variation coefficient. When spinning the same kind of yarn, the smaller the fiber density used for spinning, the more fibers there are in the cross section of the yarn, which increases the internal and external transfer of fibers during the twisting process, and the stress on each fiber is relatively uniform, which increases the tension between fibers. The contact area increases the cohesion and friction between fibers and improves the strength of the yarn. When other conditions are the same, the higher the single fiber strength, the higher the yarn strength.
2. The influence of pre-spinning process on yarn strength. The cleaning process requires a reasonable selection of process parameters to improve the opening efficiency of the machine and fully eliminate large impurities and harmful defects as early as possible; rationally configure the striking points or use combing instead of beating to reduce damage to the fibers.
In the carding process, the card clothing should be reasonably selected and the process parameters of each part should be well designed to give full play to the carding effect, eliminate short fibers and knots, and reduce new cotton The generation of knots reduces damage to fibers and improves yarn strength.
The drawing process should reduce the weight unevenness and dryness unevenness of the cooked slivers, thereby effectively reducing the weight unevenness of the roving and spun yarns. This further improves yarn strength.
The roving process should focus on improving the weight unevenness of short segments, controlling the periodic unevenness of the roving, and reducing its impact on the strength and strength unevenness of the spinning yarn. Therefore, in actual production, it is necessary to strictly control the quantity of cooked strips, reduce the table difference and eye difference, reasonably control the roving elongation, and strengthen the inspection and maintenance of rubber rollers, aprons, cradle and transmission systems.
3. The influence of other quality indicators of spun yarn on the strength of finished yarn. The better the evenness of the yarn, the better the yarn strength, and the smaller the single yarn strength variation coefficient.
The weight unevenness of 100 meters of spun yarn is an important factor causing uneven strength between bobbins. Generally, the weight unevenness of 100 meters of spun yarn should be controlled within 2 % or less can avoid the yarn strength variation coefficient exceeding the standard.
The size of the spinning twist coefficient and the twist unevenness have a great influence on the yarn strength. As the twist increases, the yarn strength gradually increases. However, after reaching the critical twist, if the twist continues to increase, the yarn strength decreases instead.
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