Detailed knowledge of yarn twist
Is defined as a yarn having a certain degree of strength, physical and mechanical properties of elasticity, elongation, gloss and feeling of the yarn, cotton yarn must be changed by twisting, a yarn from a fiber structure to achieve twisting, in fact, is the use of cross-section yarn The relative angular displacement is generated to make the original parallel and parallel fibers and the yarn axis are inclined to change the yarn structure. The thick strip is gradually contracted by the width during the twisting process, and the two sides are gradually folded and rolled into the center of the yarn strip to form an addition. The æ» triangle, in the twisted triangle, the width and cross section of the tampon change, from a flat ribbon, gradually into a cylindrical yarn.
(1). Definition of roundabout: The yarn is rotated 360 degrees around its axis to be a roundabout.
(2) Definition of twist: The number of twists in the specified length of the yarn before it is returned, usually expressed as the number of twists per inch (TPI) or the number of turns per meter (TPM).
(3). Definition of æ» coefficient: It is a measure of the degree of twisting of the yarn , and it is rounded off per unit length.
T. M: The number is multiplied by the square root of the yarn density. TM = TPI / square root of the yarn count TPI = square root of the TM x yarn count
(4). Definition of the direction: When the sliver is in the vertical position, the unit of the sliver is wound around the axis of the sliver to form the oblique direction of the spiral.
(5). Sæ» Definition: The direction of the fiber in the gauze is consistent with the middle of the letter S. It is the right-hand direction or the clockwise direction of the yarn.
(6). Zæ» definition: The direction of the fiber in the gauze is consistent with the middle of the letter Z, which is the twisted yarn in the left-hand direction or the counter-clockwise direction.
The two-twist test test is usually not evenly distributed on the whole yarn. When testing the twist, one sample is left. There are many kinds of twist testers. The approximate design is the same. First, the yarn is clamped by the clamp on the left side of the support point. Then pull to the right rotating clamp, the dial pointer is zero degree, the yarn is clamped on the rotating clamp, the sample yarn is about 10 or 20 inches, when the rotating clamp rotates, the twist is unlocked, when all the twists disappear The rotary clamp continues to rotate in the same direction until the twist is rejoined, and the pointer points to the zero mark. The number of revolutions is recorded in the number of revolutions. The total number of revolutions is divided by two, and then the length of the sample is divided to calculate the degree per inch. ?? ? The relationship between the three twists and the strong force stretches the yarn to the fracture, and it is found that not all the fibers are broken in the fracture section, but some of the fibers are broken, and the other part of the fiber is slipped, and the broken portion The fiber is not broken at the same time. The breaking property and the strength of the single yarn are closely related to the twist of the yarn . As the twist increases, the yarn strength continues to increase, but after a certain twist, the twisting degree continues, and the strength is decreased. In terms of the increase in the degree of twist and the increase in the frictional resistance between the fibers, the strong component is increased during the fracture process. The disadvantage is that the twist increases, and the inclination of the fiber and the yarn axis increases the strength of the fiber which can withstand the axial force of the yarn. Moreover, the excessive increase of the fiber stress distribution inside and outside the yarn increases the time difference of the fiber breakage, and the strength increases with the increase of the twist. When the two are equal, the force is the largest. At this time, the twist is the critical twist, and the critical twist The corresponding æ» coefficient is called the critical coefficient. The æ» degree increases, the æ» angle increases, the light reflects to the side, the gloss is poor, the hand feel is poor, and the hand feels soft, but the hairiness is too small, the hairiness is loose, the hand feels loose, and the gloss is not good. .
Primary twist and twist factor depends on the quality of the final product, different uses twist factor, depending on the finished product and the need to twist and can not be processed, in order to reduce retrofit and operating on a yarn inconvenience, are all generally Z twist . For cotton with long fiber length, fineness and high grade, the twist coefficient can be less, the fine yarn is larger than the coarse yarn. The elongation is the cotton yarn under a certain tensile load, and the cotton yarn is stretched and stretched. The length is called the total elongation. When the load is removed, the stretched cotton yarn is quickly retracted, and cannot return to the original length. This is the contractile length, which is the elastic elongation, that is, the elastic elongation and the total elongation. Percentage, the elasticity of the yarn increases with the increase of the twist, but begins to decrease after a certain degree of twist. Generally, the twist is close to the maximum range of elasticity.
Commonly used æ» coefficient, the woven warp yarn is higher, and the knitting is generally lower, about 3.5-3.6. Depending on the use of different yarn, the twist factor different yarn products, according to Japanese textile data, is divided into: general = 4.0 twist (twist factor), Pine = 3.4 twist (twist factor), especially loose twist = 1.32 2.8 (æ» coefficient), strong æ» = 5.0-5.4 (æ» coefficient), especially strong æ» = 5.0-6.5 (æ» coefficient). High-twist yarns are usually woven through the steaming process, and sometimes need to be equipped with a twister to weave.
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