Further developments will be made in spinning technology, including rapid development of ring spinning, compact spinning, spinning cup spinning, vortex spinning and staple fibre spinning systems.

1. Ring Spinning

Ring spinning started in 19th century and has been widely used now. The spinning quality has reached a very high level, and the application range and variety adaptability have been expanded.

Some problems in ring spinning are described as follows:

1. Fine yarn breakage: The practice has proved that with the continuous increase of spinning speed, the fine yarn breakage increases, and the flying flower destroys the spinning air ring, resulting in the broken end occurring in the weak ring part. But in order to improve the running characteristics of the spinning frame, it is necessary to reduce the flaring and breaking of the spinning yarn.

2. Many flares are produced when cleaning the winding part of the bottom of the tube, which will tear the yarn on the tube and scatter tiny short fleece into the workshop, which can easily cause yarn breakage. About 250 metres of yarn on the G33 ring spinning frame is lost every two hours on the 1000 spindles. G33 ring spinning frame is equipped with mechanical doffer servo tube fire holding system, which has been found to eliminate large amount of fiber loss in yarn during bottom winding and improve the running performance of spinning frame.

The spinning workshop must also be equipped with ZuiJia's air conditioning equipment. The research shows that the local broken head of the spinning frame of the long model increases obviously. When the distance between the spinning frame and the third suction port increases, the broken head increases obviously, indicating that the number of suction ports should be adjusted.

The running state of the spinning frame will be improved by increasing the number of suction ports at equal distances. The flying flowers will be improved step by step with the negative pressure air flow, which indicates the potential of the running state of the ring spinning frame. A newly designed spinning mill or some of the older spinning workshops can be considered suction improvements.

2. Compaet Spinning

Although ring spinning has been quite developed, the production technology is still not quite ideal. The leading fiber width in the ring spinning area is obviously larger than that in the spinning triangle area, indicating that some fibers at the edge of the triangle area will be lost or can not be held by the yarn body, resulting in uncontrolled fibers.

1. Spinning: triangle area: Modern common ring spinning quality and yarn structure are good, but not perfect, in order to further eliminate yarn defects and reduce hairiness, Swiss Rieter company developed the Comfotspin technology, between the yarn from the front roller door to the twist point, the spinning triangle to increase negative pressure suction, forming a tight zone between the draft pliers line and the yarn formation point.

2. Technical design and application of compact spinning: The function of some components of Ruitu K44 compact spinning machine in the whole compact spinning agglomeration area: the cylinder with holes (instead of the front roller) is equipped with special shape of negative pressure suction pores. Through the local vacuum suction mechanism, the negative pressure air flows on both sides of the drum to form auxiliary air flow, so that the fiber strips condense on the drum dust cage.

3. Improvement of yarn structure: The significant advantage of tight spinning ring ingot yarn is the improvement of yarn structure, it has better strength and elongation value, less fiber loss, significantly reduce the abnormal quality phenomenon, namely strength and weak ring. The reduction of hairiness, especially the reduction of hairiness of 3 mm and above, is an important improvement of tight spinning ring ingot yarn and has a positive effect on progressive processing.

4. Advantage of tight spinning quality: Yarn twist factor can be reduced appropriately. Increasing output speed of spinning frame is beneficial to downstream processing. The application of tight yarn can reduce yarn hair content and wear resistance. It also reduces the frequency of weave defects and makes the machine run in good condition.

5. Reduced sizing: It is beneficial to ecological and environmental protection. Tight-spun warp yarns have higher strength and fewer strong and weak rings. After sizing, warp strength increases, hair decreases, and loom efficiency increases.

3. Rotro Spinning

Compared with ring spinning frame, the spinning cup yarn has lower strength and stiffer feel, but it has many advantages throughout the production process:

① there are few strong and weak rings;

(2) small strength and elongation;

③ few hairiness;

④ Good wear resistance;

⑤ less rotary cup yarn joint.

Iv. Vortex spinning

Vortex spinning is a new technology for the production of wrapped yarn. It is a yarn core with a part of the fiber wrapped in a non-twisted fiber, and the outer layer is covered with a fiber with a fixed twist.

In the dual-nozzle spinning system, the cotton strip is subjected to false twist during the spinning of yarn core/wrapping layer structure, and the proportion of wrapped fiber is very small, only 10% of the false twist. Therefore, MTS jet spinning is only suitable for chemical fiber and cotton blended yarn. If pure cotton yarn is processed, the strength of yarn is very low, which is the main reason why the dual-nozzle jet spinning machine cannot enter the market well.

Murata has developed a new spinning process to produce the wrapped yarn. Like the double nozzle spinning machine, the drafting system remains unchanged without changing any of the drafting components. This new type of spinning is not false twist, the fibers run parallel and false twist between the drafting system and the forming point of the yarn and into fixed pastilles (hollow pastilles).

When the fibers are transmitted. Some fibers, with one end separated from the main fiber and one end acted on by compressed air (vortex), form a true twist covering at the spindle entrance.

This method of yarn formation makes it possible for the yarn itself to increase the proportion of wrapped fibers by about 20% to 30%. This phenomenon increases the strength of the yarn, especially in the spinning of cotton yarn.

Vortex spinning can produce cotton combed yarn, or common combed cotton yarn, 18 to 50 UK count. The fibers of the tampon are as parallel as possible -- as long as they are at least three times drawn, and the dust content of the tampon is as low as possible.

The separation process of the fiber end is very complicated, depending on the raw material. The fiber loss rate in the spinning process can reach 2% ~ 8%, which mainly occurs between the front roller pliers and the vortex spinning mouth. Although the lost fiber is mainly short fiber, the spun yarn and combed cotton yarn are better than the common combed cotton yarn in the actual operation.

Although vortex spinning is just beginning to enter the market, due to the high speed, over 300 m/min, the spinning machinery is fully automated, which is much better than double-nozzle jet spinning.

Contemporary spinning technology can be summarized into four categories: ring spinning; Tight spinning; Spinning cup; Vortex spinning. These four spinning systems have different characteristics, different spinning structures, spinning count range automation degree, cost structure, final product appearance and other advantages and disadvantages are different.