In recent years, there have been new raw materials, and at the same time, there is a higher demand for dyeing quality. Therefore, some new technologies have emerged to meet the requirements of new varieties.
First, precision winding, moderate overfeeding. The so-called precision winding is equal pitch winding, no overlapping winding area, good unwinding performance, and good density uniformity.
Second, steaming. For some fibers with high shrinkage, they can be steamed with saturated steam for 5-20 minutes before dyeing, so that the yarn can be pre-shrinked, heat-set, and the color produced by the shrinkage of the dye liquor caused by the shrinkage in the dyeing process can be reduced. In the shrink-proof treatment of polyester/cellulose fiber blended yarns, the yarn is generally wound on a paper tube or a wood tube and steamed at 110° C. for 20 to 30 minutes.
Third, the transformation of the bobbin. The use of warp shrinkable bobbin, yarn and bamboo fitting gasket can prevent leakage between polyester bobbin and ensure the stability of pressure.
Fourth, special preparation process. According to the requirements of the next dyeing plant, some polyester DTY manufacturers have adopted a new type of texturing machine or have been retrofitted on the original texturing machine. The bobbin used is a flexible plastic bobbin, and the winding density is also much lower than conventional ones. . After this type of bobbin is pressed, it can be dyed directly on the bobbin dyeing machine, which reduces the process of loose winding and improves the dyeing efficiency of the bobbin. It also improves the quality of the yarn due to the less one-step process.
Conclusion:
Polyester bobbin dyeing If the equipment performs well, the process can be controlled in accordance with the above method. Generally, no dyeing problems will occur. However, if the polyester cheese yarn has problems with dyeing at a certain time, such as imperfection, the winding density may be too large when the winding is loose; or the dye liquid leaks between the packages, resulting in too little dye flow; It may be that the shrinkage of the boiling water of the silk is too large, and the density of the yarn on the yarn spool after the high temperature treatment is too large to result in dyeing. If color difference occurs inside and outside the package, the winding density may be uneven, or the dyeing process may not be proper.
After dyeing, there are quality problems in yarn forming. The first thing to do is to start with the loose winding. The winding density is too small to cause the yarn to fall off. If the winding density is too large, the tightness between the packages becomes too tight. Unwind, this will correct the density. If the dyer flow is too large or the dyeing time is too long, the phenomenon of hairiness occurs.
In summary, there are many factors that affect the quality of dyeing. It is necessary to analyze it in detail, find out the root cause, and prescribe the right medicine to solve the problem. In the event of color problems with polyester cheese yarn, it can generally be repaired. The method of repair is to transfer the dye from the dark color region to the light color region under the high temperature condition with the help of the migration of the repair agent, and the amount of the repair agent should be increased to about 2 g/L to be used as a repair color flower.
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