Yarn yarn formation mechanism

　　1 Traditional ring spinning

　　Ring spinning is a spinning method that performs drafting, twisting and winding simultaneously. The roving is drawn to the required in the drafting system. The yarn strips are then twisted and wound by the steel collar and wire ring to form a yarn. Due to drafting, the width of the whisker strip in the main drafting zone is several times the diameter of the spinned yarn, and at this time each fiber forms a free state when it reaches the front jaw line. When these fibers leave the front jaw line, they are twisted together, thus forming a spinning twisting triangle. This spinning triangulation triangulation prevents the edge fiber from entering the yarn body completely, and some edge fibers leave the main body to form flying flowers, while more edge fibers are twisted into the yarn body at one end and hairy at the other end. These fibers not only play a negative role in the uniformity and elastic properties of the yarn, but also are extremely unfavorable to the strength of the yarn. In addition, the fibers outside the triangular region are subjected to a large tension during twisting, while the fibers in the center are subjected to a small tension, so the initial tension of these fibers is not equal during yarn formation, which affects the strength of yarn formation. These are all defects caused by the traditional ring spinning triangulation zone.

　　2 Rotary cup spinning

　　Rotary cup spinning, also known as air flow spinning, belongs to the free-end spinning method. The cotton strips directly fed into the spinner are combed into a single fiber by the combing roller. The fibers are separated from the surface of the combing roller through the cotton conveying pipe and enter the spinning cup by the centrifugal force of the combing roller and the negative pressure air flow in the spinning cup. , and a complete fiber ring is formed in the condenser tank. The fiber ring rotates at high speed with the spinning cup. Under the action of the joint yarn, the fiber ring is continuously transferred and the fiber bundle is continuously peeled off.

　　3Aerojet spinning

　　Aerojet spinning is represented by the MJS (MurataJetSpinner) model manufactured by Murata Company of Japan. The tampon is directly fed into the drafting device, and the drafted whiskers enter the nozzle. The high-speed rotating airflow in opposite directions falsely twists the yarn and wraps it into yarn. After the yarn is drawn out, the defects are removed through the electronic yarn cleaner. Afterwards it is wound on the barrel.

　　4 vortex spinning

　　Vertex spinning is a new generation of air jet spinning technology MVS (Murata Vortex Spinning) launched by Murata Company after MJS. The yarn-forming principle of vortex spinning is that the tampon is directly fed into the drafting device. The drafted whisker strip is output from the front roller jaw and is immediately sucked in by the negative pressure generated by the vortex in the direct nozzle of the spinner to form core fibers. When the end of the fiber is separated from the front roller, it expands due to the vortex, covers the surface of the hollow spindle, and rotates along the fixed hollow inner wall. As the yarn strip moves forward, the end of the fiber is wrapped around the core to obtain the yarn Twist to form yarn.

　　5 Improved ring spinning – compact spinning

　　CompactSpinning is also called aggregate spinning. It mainly adds a fiber agglomeration zone before the ring spinning machine drafting device, from the front roller jaw line of the drafting deviceThe migrated fiber bundles gather in a line, basically eliminating the spinning triangulation zone between the front roller and the twisting point, which is a good solution to the yarn-forming power, hairy and flying flowers that exist in traditional ring spinning. Key issues and bring a range of benefits to subsequent processing and product quality. Different machine manufacturers have provided a variety of patents for coagulating these fibers, but their principles are basically the same, all aiming to effectively control the fibers in the strips, especially edge fibers and floaty fibers, through aggregation. Reduce the width of the draft whisker strip, thereby basically eliminating the spinning twisting triangle area and producing new high-quality tight ring spindles.