1. Principle of compact spinning
Compact spinning is a new spinning technology that is spun on an improved new ring spinning machine. The spinning mechanism is mainly as follows: a fiber cohesion area is added in front of the traction device of the ring spinning machine, which basically eliminates the spinning twisting triangle area between the front roller and the twisting point. After the fiber slivers are output from the front opening of the front roller, they first pass through the mesh apron coated by the special-shaped suction duct. The slivers move on the mesh apron. Due to the contraction and polymerization of the air flow, the slivers are gathered through the suction groove of the special-shaped tube. It rotates and gradually changes from a flat ribbon to a cylinder. The ends of the fibers are all twisted into the yarn, so the yarn is very tight and the yarn has a smooth appearance and less hairiness. compact yarn
High strength and less hairiness. It is least likely to cause fraying during the weaving process.
The purpose of compact spinning is to make the fibers as parallel and close as possible before twisting the yarn. For high-quality compact yarn, this is is an important judging criterion. Making the fibers as parallel and consistent as possible before twisting is a prerequisite for its advantage.
2. Compact spinning Advantages and disadvantages
(1) Advantages:
1． Since the single fibers in the yarn are fully straightened, parallel to each other, and closely arranged before twisting, the yarn diameter is becomes very small, so the “twisting triangle area” is basically eliminated. Since the single fibers are fully straightened and parallel before twisting, there is no hairiness extending out of the main body of the yarn, so the hairiness of the yarn is very small, especially when the hairiness is extremely high above 3 mm. few.
2． In spun yarn, since each single fiber is twisted in a straight and parallel state, when the single yarn is subjected to tension, the force of each single fiber is basically the same, so the compact spinning strength is higher than that of traditional single yarn. And because the single fibers in the compact yarn are closely arranged and have strong cohesion with each other, this also helps to improve the strength of the yarn.
3． In the compact spinning process, the yarns are gathered after completing the draft specified by the process, so the unevenness of the yarns is not greatly improved, but the yarns are organized in the gathering area, and in the When twisting at the nip of the twisting roller, the transfer of the inner and outer layers of fiber is not as strong as in the traditional process, so the evenness of the compact yarn is uneven, and the thickness and detail indicators are better than those of traditional yarns.
4． Due to the above characteristics of compact yarn, it provides very good conditions for the next process. The compact yarn has less hairiness, which reduces the pressure of sizing, singeing and other processes. When using compact yarn for the weft yarn of shuttleless looms, it greatly reduces the problem of sizing. The weft resistance improves the efficiency of the loom.
5. Because the fibers of compact yarn are closely arranged and have a smaller diameter than traditional yarns of the same number, the cloth woven with the same warp and weft density has good air permeability and a flat and smooth surface, making it an ideal yarn for high-end textiles.
(2) Disadvantages:
1. The cost of compact spinning equipment is relatively high, which increases the equipment investment of spinning mills.
2． Except for the great improvement in the hairiness index, other yarn indexes such as evenness, thickness, and details have not improved much.
