Influence of yarn on fabric
1、 Influence of yarn twist direction and twist on fabric
For staple fibers, twisting is necessary for yarn formation; for filaments and strands, twisting is to form a compact structure that is not easily damaged by transverse external forces. The amount of twisting and the combination of the twist direction and twist in the yarn and the fabric have a great influence on the fabric. By twisting the yarn, the cohesion between the fibers is increased, the breaking strength and elongation at break are increased, and the wrinkle resistance and wear resistance are enhanced; but the twist is too large, the fabric is too stiff, and the folded edges are easy to wear and fracture. The twist direction has a great influence on the appearance of the fabric. The yarn is not twisted, the light is reflected from each yarn, and the surface of the yarn is dark; the twist of the yarn is appropriate, the light is reflected from the smoother surface, and the gloss is the strongest; the twist is too large, and the light is uneven on the surface of the yarn Absorbed between, reflected light increases and decreases with twist.
In the strands, the single yarn generally adopts Z twist, and when twisting, S twist is used. With this configuration, the fibers have good cohesion, uniform stress distribution, soft strands, good gloss, and high strength. The twist direction of warp and weft yarns in woven fabric is divided into two types: the same twist direction of warp and weft and the different twist direction of warp and weft. For a twill fabric, S-twist is used for the radial yarn and Z-twist is used for the weft yarn, then the twist direction of the warp and weft yarns is perpendicular to the twill direction of the fabric, and the fabric texture is obvious.
2、 Influence of yarn fineness on fabric
The fineness of the yarn directly determines the specifications, varieties, styles, uses and physical and mechanical properties of the fabric. Under the conditions of the same fabric structure and relative density, the thinner the surface of the fabric, the finer and tighter than the thicker fabric, thin and soft, in the same fabric, there are three ways to configure the fineness of the warp and weft yarns: the thickness of the warp and weft yarns Same; warp yarns are thinner than weft yarns; warp yarns are thicker than weft yarns. In actual production weaving, the first two methods are mostly used.
3、Effect of yarn strength on fabric
For knitted polyester products that need to be brushed, the effect of the breaking strength of the polyester yarn on the uniformity of the fleece on the fabric surface is obvious. The breaking strength of the raw material is too large, the load of the sanding machine increases when the wool is drawn, the wear of the wool clothing is intensified, and the bottom of the fabric suede will increase significantly. Therefore, in order to maintain the suede quality of polyester knitted and brushed products, the breaking strength of polyester filament must be kept relatively stable.
The test result of yarn breaking strength can be used as one of the basis for formulating the drawing process. When the breaking strength of the polyester filament decreases, both the old needle braid and the pulling tension can be reduced to avoid the appearance of plush. The change in the strength of the cotton yarn has a very direct effect on the suede of the cotton brushed fabric. When the twist of the cotton yarn increases and the breaking strength of the yarn increases correspondingly, it is also necessary to appropriately adjust the polishing process parameters of the cotton scouring products and the type and specifications of the scouring sandpaper, otherwise it will easily cause the strength damage of the scouring cotton fabric , Which ultimately affects the quality of the fabric.