Comparison of process characteristics and yarn quality between compact spinning and siro spinning

In recent years, there have been many reports on two new spinning methods, compact spinning and siro spinning. These two new spinning processes are also effective in improving yarn quality. As everyone recognizes, this article will analyze the characteristics and yarn quality of the two spinning processes.

Although the compact spinning process is different in mechanical structure, one thing is the same, that is, in completing the process requirements After drafting and before twisting, the wider yarn slivers output from the front roller nip are gathered so that the yarn sliver width becomes very narrow and the single fibers are arranged more closely, and try to keep it in this state. Twist area. Although some reports say that this eliminates the “twisting triangle”, in fact the width of the yarn before and after twisting is different. Therefore, there is still a very small so-called “twisting triangle area” at the jaws of the twisting roller in compact spinning, but of course its harmfulness has been reduced to a minimum. It is precisely because of the above-mentioned yarn forming mechanism that the spun yarn spun by the compact spinning process has the following characteristics:

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 There is no traditional process for transferring the inner and outer layers of fibers when twisting at the jaws of the twisting roller.It is strong, so the evenness of compact yarn is uneven, and the thickness and detail indicators are better than traditional yarn.

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.

Although the compact spinning process has many advantages, it also has some shortcomings, as described below:

1． The cost of compact spinning equipment is relatively high, which increases the equipment investment of spinning mills.

2. There is an air suction port corresponding to each yarn, and the negative pressure at the air suction port varies greatly between spindles. If you want to improve the consistency, you need to install an air suction port at each suction tube (or each spindle position). Control valve that automatically adjusts air volume. This is not only costly, but also difficult to maintain.

3. Except for the great improvement in the hairiness index, other yarn indexes such as evenness, thickness, and details have not improved much.

4. After the compact yarn goes through the winding process, more hairiness will be added. Siro spinning is to feed two rovings at a certain distance on the same spindle position.� are drafted separately, and after the yarn is output from the front roller, due to the effect of twisting, the two yarns are twisted together to form a spun yarn. Practice has proved that the yarn also forms less twist after being output from the front roller and before twisting. Two weakly twisted yarns are twisted together at the center of each other to form a unique style of Siro yarn.

The characteristics of sirospun are as follows:

1． Because in Siro spinning, two rovings are drafted separately at the same time. According to the merging theory, CX=CA/√n. In the formula, CX is the unevenness after merging, CA is the unevenness before merging, and n is Combined radicals, where n equals 2. So CX=0.7×CA. Of course, the above formula is theoretical data and is somewhat different from the actual situation. But it also explains:

Yarns spun using siro spinning technology have a very obvious effect on improving evenness and reducing thick and fine details, which is what countless spinning mills are striving for. Our company’s experiments over the past few years and the mass production practices of many users have fully proved this point.

2. After the Siro spinning yarn is output from the front roller, when twisting, the two weakly twisted yarns are wound around each other to form a Siro yarn. During the winding process, the hairiness extending out of the main body of the yarn is rolled into the yarn and is well held. Therefore, the hairiness of Siro yarn is less than that of other spinning methods, and because the hairiness is wrapped in the spun yarn by two yarn strips, the hairiness will not increase as much as other spinning methods during the winding process. This is different from other spinning methods. Unmatched by spinning methods.

3. Siro spinning yarn is basically not twisted at the nip of the front roller, so there is no so-called “twisting triangle area”, which greatly reduces fly waste in the workshop.

4. After the winding process, Siro yarn has less hairiness than compact yarn, so it has superior performance in the sizing, weaving, and singeing processes.

5. During the twisting process of siro yarn, the degree of internal and external transfer of fibers is small. After the yarn is formed, the fibers are arranged regularly. Its yarn strength is better than that of single yarn and lower than that of ply yarn. In addition, siro yarn has fewer details. This Also helpful in increasing yarn strength.

6. Siro spinning equipment is more compact than The spinning mechanism is simple, the equipment investment is low, and it is easy to maintain.

7. Siro yarn has similar properties to ply yarn and can replace ply yarn in many cases. However, Siro spinning does not need to go through a twisting machine, and the process flow is shorter than the conventional process, saving energy and labor.

In summary, the siro spinning process has advantages that other spinning processes cannot match, but it also has its shortcomings at.

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