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Twist factor and twist direction

February 27,2023

The twist cannot be used to compare twist degrees of dty nylon yarns of different sizes, because thicker dty nylon yarns tilt their fibers more than thinner dty nylon yarns with the same twist. In practical production, the twist coefficient is often used to indicate the twist degree of dty nylon yarn.

The twist factor can be calculated according to the twist of the dty nylon yarn and the dty nylon yarn density.


The twist coefficient is the relative value of dty nylon yarn twist degree combined with the linear density. It can be used to compare the twist degree of dty nylon yarns of different thicknesses. The greater the value, the greater the degree of twist.

The choice of twist coefficient is mainly determined by the nature of raw materials and dty nylon yarn use.

The twist factor of the dty nylon yarn can be lower when spinning with slender fibers
When spinning with staple fibers, the twist factor should be higher

The warp needs higher strength, and the twist factor should be larger

Weft and knitting dty nylon yarn is generally required to be soft, and the twist coefficient should be smaller.

The twist coefficient of polyester dty yarn for knitting and knitting should be small to facilitate the raising of polyester dty yarn.

Thin fabrics and knitted outerwear fabrics should have a smooth style, and the polyester dty yarn twist factor should be larger.

Polyester dty yarn fineness, twist coefficient is different, fine polyester dty yarn twist coefficient should be larger

The roving twist coefficient of general chemical fiber is smaller than that of pure cotton spinning. It is 50% ~ 60% of that of cotton spinning and 40% ~ 50% of that of medium-length chemical fiber spinning. The specific data should be determined by the type and quantity of raw materials.

The twist coefficients of conventional polyester dty yarns are as follows: ring spinning machine polyester dty yarn 360-400; Ring spinning knitted polyester dty yarn 320-360; Ring spinning low count pile polyester dty yarn 280-320; Air spinning 400-440.

The twist direction refers to the inclination of the single polyester dty yarn in the fiber or strand after the polyester dty yarn has been twisted. It comes in Z-twist and S-twist. After twisting, polyester dty yarn twist from the lower right corner to the upper left corner, tilt direction and the middle of the "S" is consistent called S twist or smooth twist; The twist of the polyester dty yarn from the lower left corner to the upper right corner is called a Z-twist or backhand twist if the tilt is consistent with the middle of the "Z". Generally, single polyester dty yarn is often used in Z twist, and strand is used in S twist.


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