The yarn structure is the basis for determining the properties of the fabric. In recent years, new types of fabrics at home and abroad have used a large number of multi-component filaments composed of a plurality of filaments, and among the yarns compounded by filaments and staple fibers, there are mainly core-spun composite yarns, wrapped composite yarns, Sirofil composite yarns and Plyfil composite yarn, etc. The processing of these composite yarns usually requires the use of special processing equipment and is costly to produce. The twisted composite yarn of filament and spun yarn can be processed by conventional parallel twisting equipment, and the processing cost is low, and the obtained yarn also has the advantages of filament and spun yarn, and the type fabric.
The root polyester-viscose blended yarn is compounded with enamel. The yarn has good elastic recovery performance and poor forming stability, and needs to be shaped for production. However, due to the company's equipment conditions, the process of processing the product lacks a heat setting process, resulting in a large number of kinking during the warping and wefting process, that is, the strands are twisted and twisted to form a 'small scorpion', and the warping process is particularly serious. The following is referred to as the "small scorpion". The emergence of such a large number of defects has seriously affected product quality and production efficiency. Due to the limitations of economic conditions, manufacturers are temporarily unable to purchase shaped equipment, and must find another solution. For this reason, the technical research has been carried out well, and the effect of the Electronic 1 bobbin unwinding process is analyzed during sizing, weaving, unwinding, The tension of the take-up is relatively large, and the yarn is always in a tension state, so that no "small scorpion" is formed. In the process of warping and wefting, although there is a certain tension, the tightness of the yarn changes greatly when the package is unwound, and it is easy to form a "small scorpion" in the relaxed state. In practice, it has been found that the phenomenon of “small scorpion†in the warping process is more prominent.
The warp axis of the warping machine is close to horizontal, and its unwinding trajectory is a varying three-dimensional space curve. As shown by -a, the DB segment yarn is unwound from the bobbin, and automatically detaches and relaxes from point B to point C, and the kinks form a "small scorpion". Therefore, the main part of the "small scorpion" defect is the BC segment.
When the warping machine is unloaded, the warp winding speed is basically the same as the yarn unwinding speed, and there is no kinking phenomenon. Due to menstruation or other reasons, when the warping machine suddenly stops and then drives, it will produce "small scorpions", which are numerous and dense. Therefore, the time when the "small dice" is generated is the parking time during the operation of the warping machine.
2 Mechanism of production 2.1 Internal stress When the yarn is twisted, the fiber is subjected to a certain external force and undergoes distortion. Therefore, it has an internal stress that restores its original state; and, the polyester filament has a high initial modulus and a strong resistance to twisting. The yarn is relaxed to a certain state, a break point is generated, and the knot is started to form a "small braid", and the internal stress is released.
2.2 Friction The small yarn is made of polyester filament and medium-length single yarn. The content of polyester filament is 48.1%. The twist of polyester-bonded medium-length yarn is 700æ»/m. The yarn cross section is basically round. . The polyester yarn is bundled by a plurality of spinning holes, and has no twist, and the yarn has a flat appearance. Therefore, the coverage of the polyester yarn on the surface of the yarn is large. The surface of the polyester yarn is smooth, and the surface of the yarn is smooth. As shown by -b, the friction between the moving yarn EF and the surface of the bobbin is small, so that the tension of the yarn segment between the unwinding point and the porcelain eye is small.
2.3 Uneven tension yarns In the unwrapped three-dimensional space curve, the tension varies greatly. As shown by -a, >TB>Tc, the yarn from the point B to the point C automatically falls off due to the inertia of motion and its own weight, and the tension suddenly becomes smaller and relaxed. Under the action of elastic deformation, kinks are generated to form a "small scorpion". The larger the package, the greater the difference in tension between the upper and lower sides, and the more obvious this phenomenon.
2.4 In the initial stage of the motion inertia test, when the warping machine stops and the head is broken, the warp beam has stopped rotating and winding due to the brake. The yarn on the bobbin continues to retreat due to the inertia of the movement to stand still, and the yarn is unwound excessively to make the bobbin to The yarn section between the warping rollers of the warping machine is slackened, in particular, the yarn is loosened more at the cheese-to-guide yarn.
In summary, in the case where the internal stress cannot be eliminated, the tension is too small and the tension is uneven, which is the main reason for forming the twisted knot of the composite yarn.
3 meters take measures to raise the guide wire porcelain seat. Under normal conditions, the upper and lower cylinders of the warping machine are in the same position as the porcelain eye. This process is not suitable for free fall off. Reducing the length of the free-off yarn segment can reduce the occurrence of this phenomenon. After the test, the height of 20 mm of the porcelain seat can eliminate the "small scorpion" defects, but the adaptability of the warping machine is too poor. The process can only produce "Badys" and is not suitable for other varieties. Every time the product is changed, the position of the porcelain seat must be fully adjusted. The workload of the security personnel and the difficulty of changing the variety are added. The warping machine has a long parking time, which is easy to cause the supply of the weaving shaft to be out of line. It is not suitable for promotion. Therefore, we carry out The following test was conducted.
The second method we tested was to change the way the yarn was wound at the porcelain eye. When producing the "Badis" variety, the yarn is wound on the tension disc column, and the tension between the large porcelain eye and the warp beam segment makes the "small scorpion" between the cheese and the porcelain eye The drawing of the large tension is pulled down. After the test, after the warping machine was driven, the whole creel swayed greatly and was unstable; when the speed was increased, the yarn had more broken ends at the porcelain seat, and the warping efficiency was low, only 40.7% could not be promoted.
Finally, we took a set of bags on the bobbin to improve the warping tension. A self-made cotton bag is placed on the bobbin to reduce the balloon and the tension when the large yarn is unwound. After the machine test, the "small scorpion" defect was greatly reduced, and the production and quality of the weaving machine were significantly improved. The big bobbin effect is better than the small bobbin. However, during the warping process, the bag is easy to fall off under the tension of the yarn, and the warping efficiency is low. By improvement, the cloth is fixed on the creel with a thread above the bag, and a small nut is sewed underneath, so that it is always close to the cheese yarn, and the friction between the large yarn and the cotton bag reduces the time for the yarn to fall off automatically. The sliver in the relaxed state is short enough to produce a kink.
Using this method, a 100,000-meter "Badis" variety was produced, and the efficiency of warping was 68.7%, and the efficiency of the loom was 91.6%. The effect was good. Practice has proved that for manufacturers lacking shaped equipment, this method has less investment, quick effect, and high operability, which is worth learning. Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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