Siro spinning is a spinning method in which yarns with a structure similar to strands are spun on conventional ring spinning frames. Siro spinning technology was first applied to wool spinning, and then gradually applied to cotton spinning. In siro spinning, two rovings are fed from the bell mouth, and the two strands are still separated in the front and rear drafting areas. After a certain length is output from the front jaws, they are combined and twisted by the same spindle to form a double sliver. A siro yarn characterized by a strand structure. The simultaneous twisting of siro spinning makes the yarn have a special structure. The fibers on the surface of siro spinning are neatly arranged, the yarn structure is tight, the hairiness is less, and the pilling resistance is good. Compared with stranded fabrics, siro fabrics are softer and smoother to the touch. Siro spinning can be used in woven and knitted fabrics, and can also be used in high-count and high-density fabrics instead of strands.

      Compact spinning technology is a new type of ring spinning technology based on traditional ring spinning. Simply put, it is a spinning technology that densifies the fibers output by the spinning frame after drafting, that is, by adding a suction device before twisting the whiskers, and through the control of negative pressure, the loose fibers are gathered and cohesive, and the fibers are controlled. The area is fully straightened, and the twisting triangle area on the traditional spinning machine is reduced, so that the fibers can be twisted in a parallel and tight state. Due to the uniform force and tight cohesion of the fibers in the sliver, the yarn structure and quality are comprehensively improved, and the hairiness, strength, evenness, wear resistance, and yarn appearance have been significantly improved.

      Compact siro spinning is a combined process spinning method that combines compact spinning and siro spinning. Compared with siro yarn, compact siro yarn has less hairiness, higher strength, and has the effect of siro spinning. It is an ideal raw material for spinning high-grade fabrics and has a good development prospect.