1. COMPACT YARN It is a new spinning concept and new te […]
1. COMPACT YARN
It is a new spinning concept and new technology. It is mainly improved on the spinning frame. The drafting system for conventional yarns (https://www.dkyarn.com/product/conventional-product-line/) is different from the traditional spinning frame. After the output roller, an additional set of devices is added to gather the fibers, so that the two drafts can be effectively passed. The roving sliver converges before entering the twisting zone. An air flow is used to pull the sliver from the clamping point of the roller drafting system and gather it on a porous surface. The sliver is compressed under the action of suction to narrow the jaws. The width of the roving can greatly reduce the height of the spinning triangle, the twisting effect of cotton yarn is increased, and the cotton fiber is more orderly and tightly entangled, which greatly reduces the number of cotton yarn hairiness.
It is called A and B yarn in mainland China, and it is officially named Siro Spinning recently. It is to feed two rovings with a certain distance on the spinning frame. After being drafted, the front roller outputs the two single yarn strands, and due to the transmission of twist, the single yarn strands have a small amount of twist and are combined. It is then further twisted into a yarn that resembles a ply and is wound on the bobbin. The original design purpose of Siro spinning is to be used in wool spinning. The yarn has: less hairiness, high strength, and good abrasion resistance. To achieve the effect that the wool yarn can be woven by single yarn to realize the lightness and thinness of the wool fabric, although Siro spinning has greatly improved compared with similar conventional yarns in many aspects, there is still a certain way to achieve the non-sizing weaving of woolen single yarn. Afterwards, wool spinning often gave up this method. Instead, it was used in blended spinning such as T/C, CVC, etc., because it can produce a twist effect after dyeing and has a good hand feel, so it is popular. Recently, it has improved hairiness. For example, spinning some fibers that are prone to hairiness, such as rayon, modal, tencel, soybean fiber, and even cotton are produced by this method. The raw material grade used in Siro yarn can be lower than that of conventional ring spinning, and its fabric is more conventional The ring-spun strand fabric has less hairiness, soft hand feeling, wear resistance and good air permeability.
Similar to Siro spinning, it is also changed on the basis of Siro spinning. The difference is that one roving is changed to a fine denier filament, which is combined with another roving (wool, cotton or linen, spun silk, etc.) A filament feeding device is installed on the ring spinning machine, so that the filament and the normally drawn strands are fed equally at a certain distance, and merged downstream of the front roller jaws, and twisted into yarn. It is also called two-component spinning or composite yarn because it is made by twisting two-component raw materials of various chemical fiber filaments and spun yarns. The fabric spun by Sirofi has elasticity, wrinkle resistance, drape, good air permeability, and anti-pilling. The fabric has good dimensional stability and many product variations.
Also known as cable spinning, a new technology introduced by the International Wool Bureau is to install a splitting roller with many grooves on the surface under the front roller. Its function is to use the grooves to divide the flat whiskers output under the front jaws. Many narrow strips are formed. These narrow fiber strips revolve around their own twisting center due to the transmission of twist, with a small amount of twist, and then move down with the yarn winding movement, and then are converged and twisted to form a similar multi-strand yarn. The twisted cable yarn is called cable spinning. Compared with the Siro yarn twisted by only two weakly twisted strands, this kind of yarn twisted by multiple weakly twisted strands has higher strength, better abrasion resistance and more With less hairiness, it is most suitable for pure wool or blended yarn. In fact, the single yarn of Solo yarn can be directly woven into fabric without sizing.
This spinning method is based on compact spinning, with the characteristics of Siro spinning, that is, feeding two rovings with a certain distance on the compact spinning frame, after being drafted, through the compact spinning device, the yarn is similar to the stranded yarn. , The exposed hairs are gathered on the porous surface, and the sliver is further twisted due to the compression of suction, and then wound on the tube. The hairiness of the yarn is almost non-existent, and the strength is also high. It is most suitable for mercerizing yarn, and can reduce the singeing process and reduce the bottom cost.