Core-spun yarn structure diagram

Core-spun yarn, a unique composite structure yarn, is formed by tightly wrapping core yarn with outer fibers, resulting in a compact structure and uniform yarn body. Its core-sheath structure allows core-spun yarn to not only break through the single functional limitations of ordinary ring-spun yarn but also integrate the appearance and feel of the outer fibers with the excellent performance of the core yarn. This complementary advantage makes core-spun yarn superior in overall quality and highly favored by people. Next, we will introduce several spinning methods for core-spun yarn.

Among them, the spinning method of ring-spun core-spun yarn is particularly noteworthy. By modifying the ring spinning frame and adding a long fiber feeding device, the long fibers are fed directly from the back of the front roller without being drawn. At the same time, the outer fibers are fed in according to the traditional ring spinning method, unwinding from the roving bobbin and entering through a bell mouth, where they are drawn and combined with the long fibers at the front roller, being wrapped around the surface of the long fibers. Subsequently, through twisting and winding together, core-spun yarn is finally produced.

Due to the wide range of production varieties, practical raw material choices, and high-quality yarn produced by ring spinning technology, ring-spun core-spun yarn has become the most commonly used and mature core-spinning method. However, during the ring spinning process, there may sometimes be issues with the core yarn's core fibers being exposed, which can lead to difficulties in dyeing and severely affect the fabric's usability.

To solve this problem, the air-jet spinning core-spun yarn technology has emerged. It improves upon traditional ring spinning by adding a core fiber guiding device, changing the feeding method from single coarse yarn feeding to double coarse yarn feeding, and using an appropriate double bell mouth design to adjust the spacing of the double coarse yarns. During the spinning process, the coarse yarn is drawn through the roller area and combines with the long fibers fed in through the guiding device located between the two coarse yarns at the front roller nip, then wound onto the yarn tube, thus producing air-jet spun core-spun yarn.
Since the air-jet spun core-spun yarn maintains a certain distance between the two coarse yarn strands and actively wraps the core fibers during the spinning process, the internal stress of the yarn is evenly distributed through two twists above and at the convergence point. Therefore, the resulting yarn structure is compact, quality stable, and outperforms traditional core-spun yarn in all aspects.

Next, we will introduce compact-spun core-spun yarn.

Compact spinning is a new technology in ring spinning that eliminates or reduces the spinning triangle area through negative pressure airflow and corresponding mechanisms, effectively controlling fiber movement, especially reducing the production of edge fibers and floating fibers. This significantly reduces the pilling phenomenon of the yarn, enhances strength, and correspondingly reduces cotton knots. The compact core-spun yarn produced using compact spinning technology has significantly reduced fluff, while also improving the sliding resistance of the covering fibers on the long fibers, making the stitches clearer during garment making and allowing for a reduction in yarn count and twist, resulting in softer fabrics.

Now let's look at rotor-spun core-spun yarn.

It is achieved by modifying traditional rotor spinning machines, using hollow spindles and adding long fiber unwinding devices. During the spinning process, the long fibers enter the spinning cup through the axial hollow spindle, forming rotor-spun core-spun yarn under the high-speed twisting action of the short fibers in the spinning cup, and are then drawn out by the yarn guide roller and wound into bobbins. It is worth noting that in the production of rotor-spun core-spun yarn, the long fibers do not have free ends, so the core fibers are not twisted. In other words, the long fibers are wrapped by the high-speed rotating fiber strands rather than being twisted after being covered by the fiber strands.