In order for the fibers to stick together better, cover each other, and form a stronger yarn, they twist them together. That is, the fibers are rotated around their own axis to increase the friction points between them and gain more strength. This is called fiber twisting. In the same way, two or more yarns are twisted around their longitudinal axis to achieve greater uniformity and strength. This is called yarn twisting.
Fibers twist in the same direction. If one end of the yarn is fixed, the other end of the yarn should be twisted with the spool to warp.
The twist of one part of the yarn is different from the other. Although the false twist is stabilized by steam and heat, it unwraps easily. Although the two ends of the yarn are fixed, the twisting machine starts spinning from the middle of the yarn and produces a false twist. As mentioned, a false twist unwraps without stabilization.
What is the purpose of twisting?
- Holding the fibers together to make up the single-ply yarn or keeping the yarns together to make up the multi-ply yarn.
- stop yarn from fuzzing
- Increasing yarn strength
- more resistance to friction
- More uniformity
- Preparing yarn for knitting
How to twist yarns:
The direction of the twist is right twist (z) or left twist (s). If we have yarns with Z twist and want to produce multiple yarns with Z twist in one step, the strength of the resulting yarn will be less than the strength of the original yarns. For this reason, we change the type of twist at each stage of twisting process. For example, if the initial yarn had a z-twist, we select the s-twist for the next step.