It is shown that the twisting of a viscose rayon yarn followed by a subsequent de-twisting produces a reduction in tenacity and extensibility of the constituent filaments, and that the magnitude of this effect is influenced by the type of twisting machine, twisting tension, amount of twist, and the number of times the …
Why is Twist important in yarn making?
Adding more twist to your yarn causes it to tighten up, making it slightly stronger and less susceptible to pilling, and also making the stitches easier to work and less likely to split. Reducing the twist in a yarn makes the fibers and plies separate and it is more difficult to work without splitting the yarn.
How does yarn twist affect the fabric?
EFFECTS OF TWIST ON YARN & FABRIC PROPERTIES In the case of wearing properties: High level of twist helps to resist abrasion as the fibres can’t easily pulled out of yarn. The same effect also helps to prevent pilling. 20. … 2) Increase tensile properties of yarn due to twist.
What is the result while yarn with many twisted?
Twisting is simply the process of combining together multiple fibres, threads or yarns in a wrapping around (twisting) motion. Twisting fibres will create a thread (or singles), twisting threads will create a yarn, twisting yarns will create a cord or cable – and so on.
What is the impact of optimum twist factor on yarn?
Yarn tensile strength increases in staple fiber yarns as twist increases up a certain twist level known as ‘optimum twist‘. Beyond this point, the strength of the yarn begins to decrease. On the other hand, filament yarns are stronger untwisted, and the strength decreases as twist increases.
What happens if TPI of yarn is increased?
17 TPI shows better results for Tenacity and Strength. The weaving performance is depending on the yarn quality. The yarn must have less thick and thin places having less hairiness. … As TPI increases then U%, CV%, Thin place, Thick place, Neps are increases and Tenacity, Strength get decreases.
What is the difference between S and Z-twist?
S-twist yarn is a yarn spun counter-clockwise and is normally used to create right-handed twill, while Z-twist yarn is used for left-handed twill. By opposing the direction of the yarn and the direction of the twill, the finished material is softer than fabric created with a corresponding yarn and twill weave.
What happens as the degree of twist is increased?
As twist increases, the helix angle (the angle between the filament axis and cord axis) increases (Figure 14.20). Thus tension stresses normal to the cord axis result in greater-force parting filaments.
Why high twisted yarn is required for creating georgette fabric?
Originally made from silk, georgette is made with highly twisted yarns. Its characteristic crinkly surface is created by alternating S- and Z-twist yarns in both warp and weft. … Since georgette fabric is thin, it is also lightweight, and can be used as a layer in a larger garment without being heavy or bulky.
Why is twisting an important part of spinning?
Spinning is the twisting together of drawn-out strands of fibers to form yarn, and is a major part of the textile industry. There are several industrial processes available to spin yarn, as well as hand-spinning techniques where the fiber is drawn out, twisted, and wound onto a bobbin.
What is twisting in yarn?
Twisting, in yarn and rope production, process that binds fibres or yarns together in a continuous strand, accomplished in spinning or playing operations. The direction of the twist may be to the right, described as Z twist, or to the left, described as S twist.
What do you call the tightly twisted Fibre?
Stretch yarns are frequently continuous-filament synthetic yarns that are very tightly twisted, heat-set, and then untwisted, producing a spiral crimp giving a springy character. Although bulk is imparted in the process, a very high amount of twist is required to produce yarn that has not only bulk, but also stretch.