Effect of yarn twist characteristics on fabrics

Sinrylion has focused on the manufacturing of polyester twisted yarn since 1983. It has a 100% OEM&ODM factory and accepts customization of twisted yarns of various specifications.

Twisting is a necessary means for short fiber edges to grow into yarn. The twisting of the yarn causes the two cross-sections of the yarn to rotate relative to each other. At this time, the fibers in the yarn that are originally parallel to the yarn axis tilt into a spiral. The twist direction and twist of the yarn and the combination of the twist direction and twist of the yarn in the fabric have a great impact on the physical properties and wearing properties of the product.

By twisting the yarn, the cohesion between fibers increases, the breaking strength and elongation at break increase, and the wrinkle resistance and abrasion resistance also increase, but the twist cannot exceed a certain value, otherwise the textile The fabric is stiff and easy to break at the hems, and its strength is reduced. Moreover, it is difficult for dyes to penetrate, and it is easy to fade or "whiten" after dyeing. Yarns for different uses have different twist requirements.

Generally speaking, under the premise of meeting the strength requirements, the smaller the twist of the yarn, the better, because the increase of twist will make the yarn feel harder, the elasticity decreases, and the shrinkage increases. For example, filament yarns should be twisted as little or as little as possible; yarns used for woven and knitted fleece fabrics should have a smaller twist to facilitate fleece; the twist of warp yarns should be appropriately increased to adapt to the high tension and friction of the weaving process. requirements; linen yarn fabrics are required to have a crisp and smooth feeling, and the twist of the yarn should be larger.

In addition, the arrangement of warp and weft yarns in the fabric: same twist and different twist will also be quite different. This is because when the warp and weft yarns are arranged with the same twist, the turning directions on the contact surfaces of the warp and weft yarns are consistent, so that the yarns of the two systems of warp and weft can be embedded in each other, resulting in an increase in the cohesion force. Embedding also makes fabrics with yarns arranged in the same twist appear thinner than fabrics arranged in different twists, so fluffy, thick and soft fabrics should choose different twists. At the same time, since the turning direction of the fabric with the yarns arranged in the same twist is exactly 90° vertical from the front, the yarn reflection is inconsistent, resulting in a luster that is not as good as the different-twist fabric.

Some fabrics with hidden stripes and hidden grid effects on the surface are woven by using the same and different twists to have inconsistent gloss. The twist direction is also related to the twill direction of the twill fabric. If the warp yarn is Z-twist, the left twill is often used; if the warp yarn is S-twist, the right twill is often used.

Twist has an impact on the volume weight and diameter of the yarn. The twisting effect reduces the diameter of the yarn and increases the tightness. For the same yarn gap, the unit weight increases. After twisting the yarn, the gaps between the fibers become smaller, and the original air in the gaps is squeezed out. The thermal insulation of fibers mainly depends on the air content. The larger the air content, the better the thermal insulation. Therefore, when the amount of static air between fibers becomes smaller, the thermal insulation of the fabric will also become worse.

The gaps between fibers are also related to the moisture absorption and breathability of the fabric. Fabrics with large gaps have better permeability and faster moisture absorption and breathability. Twisting can improve the yarn's resistance to pilling. The greater the twist, the greater the friction and cohesion between fibers, making it difficult for the fiber heads to slide to the surface of the fabric, making it difficult to get entangled and pilling. In addition, the greater the twist, the tighter the yarn and the better the resistance to snags.

Twisting can also increase the bending stiffness of the yarn, reduce the softness of the fabric, and worsen the drape. Because the more fiber heads exposed on the yarn surface, the better the fiber softness. Such as towels, underwear and cotton socks, the twist should be smaller to make the finished products soft and comfortable.

The twist of the yarn is related to the surface texture of the fabric. The so-called glossiness is actually determined by the amount of light reflected by the object that can be seen by the naked eye. Take cotton yarn as an example. When the combed cotton yarn is untwisted, light is reflected on the surface of each fiber, and the surface of the yarn appears darker and dull. When the twist of the combed cotton yarn reaches a certain value, the light is reflected from the smoother surface. The amount of reflection reaches its maximum. But when the twist continues to increase, the light is diffusely reflected and absorbed between the convex and concave surfaces of the yarn surface. Therefore, the reflected light weakens as the twist continues to increase. Therefore, the surface of the fabric woven with high twist yarn has soft reflection and a soft feel. Also harder.