Printing technology has an ancient and long history in China. As early as the Six Dynasties and Tang and Song Dynasties, there were records of five-color clips. According to historical research, common dyeing processes such as tie dyeing, batik and textile printing all originate in China.
With the improvement of the level of science and technology, the development of reactive dyes is extremely rapid and has been widely applied to the printing process. China has also developed and produced more mature types of reactive dyes such as X-type, K-type, K-type, M-type, KE-type, KP-type high-fixation rate and complete chromatogram. This article analyzes the factors affecting the quality of reactive dye printing and common rickets for reference.
1. Process flow of reactive dye printing
Grey fabric – tumbling cut – retort bleaching – drying – printing – steaming – washing – finishing
2. The effect of pre-treatment process on the quality of printing
2.1 bleaching process
In order to improve the intrinsic quality and appearance quality of cotton fabric printing products, pre-treatment is usually carried out before printing, mainly bleaching process, in order to remove the pigment on the fabric, improve the whiteness or color vividness of the fabric, and also remove Other impurities remaining on the fabric such as cottonseed hulls, waxy, and the like.
The acidity and alkalinity, temperature, time, concentration and stabilizer of the bleaching liquid in the pretreatment process will have a certain influence on the whiteness consistency of the cotton fabric. Therefore, the process conditions must be strictly controlled.
2.2 Cold rolling reactor technology
In practice, it has been found that the semi-products such as cotton treated by the cold-rolled pile process have low wool effect, such as the cotton fabric treated by the cold-rolled pile process, and the imported high-efficiency scouring agent has a hair effect of about 250px, while some domestic scouring agent hair is used. The effect is 7 to 200px. The effect of 7~200px is feasible for ordinary fabric printing, but it is not conducive to the production of high-grade printing and dyeing products.
The way to solve this problem is to use a special chiller for expensive cold-rolled piles, or to steam after a short period of time to greatly improve the effect. The results showed that the fabrics treated with short steaming for 5 min after cold stacking increased significantly, with an increase of 3 to 125 px. If the steaming time is 10 min, the hair effect can be further improved. In addition, the whiteness of the fabric after the short steaming is further increased, which is mainly the result of further bleaching of the hydrogen peroxide during the short steaming. The short-time steaming of the polyester-cotton blended fabric after cold stacking can also significantly improve the wool effect.
2.3 desizing and scouring process
If the wax on the grey fabric is not removed during the scouring and scouring, the residual wax on the cloth surface is brought to the printing process, and the dye is not adsorbed, thereby generating wax spots.
In order to completely remove the wax, some emulsifiers such as flattening and detergent can be added in the scouring, and some emulsifiers can be used in the same bath to refine the steaming time to reduce the wax residue. In particular, it is necessary to use hot water of 80 degrees or more during washing, and spray water should not be used to prevent the precipitated wax from coming back onto the cloth surface.
3. Influence of slurry and drainage on printing quality
For printing, the preparation of the color paste is very critical. The slurry must be opened and the thickness should be consistent. Too thick will result in impermeability or exposure, too thin and easy to stain. In order to prevent impurities in the slurry from being dissolved or solid particles, the prepared slurry must be filtered.
Another important influencing factor is the arrangement of the nets. Generally, the first color is printed with a light color and the dark color is printed. The color is dark after the front color, otherwise it will cause color.
From the above analysis, it is known that the pretreatment is very important in the reactive dye printing process. If the pre-treatment hair effect is not up to standard or the whiteness is inconsistent, the subsequent printing will be difficult.
In order to strengthen the quality of the pre-treatment process, there should be a corresponding quality checklist in each process before the process, and only if all the indicators are qualified before entering the next process. The operator of the machine should also improve the operational skills and strengthen the responsibility of the staff to pay attention to every small detail in the production and processing, not to grab the output and not the quality. If you can do both of these, the quality of the print will definitely improve.
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