Yarn twist
Concept: The twisting of the fiber structure of the wire produces a relative angular displacement between the cross-sections of the wire, changing the structure of the wire by tilting the straight fibers with the axis. Twisting can make the thread have certain physical and mechanical properties such as strength, elasticity, elongation, gloss, hand feeling, etc., expressed by the number of turns per unit length, commonly used per mile (TPI) or number of turns per meter (TPM) .
Roundabout: Rotate 360 ​​degrees around the axis for a roundabout.
æ» direction (S direction or Z direction): the direction of inclination of the spiral formed by the rotation about the axis when the sliver is vertical. The oblique direction of the S direction coincides with the middle of the letter S, that is, the right hand direction or the clockwise direction. The direction of inclination of the Z direction coincides with the middle of the letter Z, that is, the left hand direction or the counterclockwise direction.
The relationship between twist and strength: the twist of the line is proportional to the strength, but after a certain degree of twist, the strength decreases. If the degree is too large, the angle of the back is increased, the gloss of the line is poor, and the hand feel is poor; the degree of twist is too small, hairiness occurs, and the hand feels loose. This is because the increase in the twist and the increase in the frictional resistance between the fibers increase the strength of the wire. However, as the twist increases, the axial component of the sliver becomes smaller, and the stress distribution of the inner and outer fibers is uneven, resulting in inconsistency in fiber breakage.
In short, the fracture properties, strength and twist of the wire are closely related. The twist and twist are determined according to the needs of the finished product and the post-processing, and are generally Z-direction.
Roundabout: Rotate 360 ​​degrees around the axis for a roundabout.
æ» direction (S direction or Z direction): the direction of inclination of the spiral formed by the rotation about the axis when the sliver is vertical. The oblique direction of the S direction coincides with the middle of the letter S, that is, the right hand direction or the clockwise direction. The direction of inclination of the Z direction coincides with the middle of the letter Z, that is, the left hand direction or the counterclockwise direction.
The relationship between twist and strength: the twist of the line is proportional to the strength, but after a certain degree of twist, the strength decreases. If the degree is too large, the angle of the back is increased, the gloss of the line is poor, and the hand feel is poor; the degree of twist is too small, hairiness occurs, and the hand feels loose. This is because the increase in the twist and the increase in the frictional resistance between the fibers increase the strength of the wire. However, as the twist increases, the axial component of the sliver becomes smaller, and the stress distribution of the inner and outer fibers is uneven, resulting in inconsistency in fiber breakage.
In short, the fracture properties, strength and twist of the wire are closely related. The twist and twist are determined according to the needs of the finished product and the post-processing, and are generally Z-direction.
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