Factors Affecting Printing Quality Of Reactive Dyes In Textiles

Printing technology has an ancient and long history in our country. As early as the Six Dynasties and the Tang and Song Dynasties, there were records of five colors of valerian skirt.

Historically, common dyeing processes such as tie dyeing, batik printing and textile printing have all originated in China.

With the improvement of science and technology,

1. printing process of reactive dyes

Grey cloth - turning, cutting, desizing, boiling and drying -

2. effect of pretreatment process on printing quality

2.1 bleaching process

In order to improve

The acidity, alkalinity, temperature, time, concentration and stabilizer of the bleaching liquor in the pretreatment process will affect the whiteness consistency of cotton fabric.

Therefore, we must strictly control the technological conditions.

2.2 cold pad batch process

In practice, it is found that the semi-finished products such as cotton treated by cold pad batch process are not very effective. For example, the cotton fabric processed by cold pad batch process uses an imported high efficiency scouring agent, and the wool efficiency is about 10cm, while the domestic scouring agent is 7 to 8cm.

The wool effect of 7 ~ 8cm is feasible for printing ordinary fabrics, but it is not conducive to the production of high-grade printing and dyeing products.

The way to solve this problem is to use the expensive cold pad batch special scouring agent, or after short time steam evaporation after cold reactor, so as to greatly improve the wool efficiency.

The results showed that the wool efficiency of fabrics treated with short steam 5min after cold reactor increased significantly, with an increase of 3 to 5cm.

If the steaming time is 10min, the capillary effect can be further improved.

In addition, the whiteness of fabric after short evaporation is further improved, which is mainly due to the further bleaching effect of hydrogen peroxide.

Short time steaming of polyester cotton blended fabric after cold storage can also significantly improve the wool efficiency.

2.3 desizing and scouring process.

If the waxes are not removed from the fabric when desizing and scouring, the residual wax on the cloth will be removed from the printing process, resulting in the non adsorption of the dye, resulting in wax spots.

In order to completely remove wax, some emulsifiers such as plain add and detergent can be added to scouring, and some emulsifiers and scouring in the same bath can prolong the steaming time and reduce wax residue.

In particular, we should pay attention to the use of hot water more than 80 degrees when washing, and do not use spray water to prevent the precipitated wax from returning to the cloth.

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3. the influence of size and net on the quality of printing.

For printing, the modulation of color paste is very important. The size of the paste must be opened and the thickness should be consistent. Too thick will cause impermeable or exposed, too thin and easy to color.

In order to prevent impurities in the slurry from being solid or granular, the prepared slurry must be filtered.

Another important factor is the arrangement of nets. Generally, they are first printed with light color and then dark. The color is fresh before dark, otherwise it will cause color.

4 Conclusion

From the above analysis, pre treatment is very important in reactive dye printing process. If the wool is not up to standard or the whiteness is not consistent, the printing will be difficult.

In order to enhance the quality of pre-processing, there should be a corresponding quality checklist in each process before processing. Only when all the indicators are qualified can they enter the next process.

The operator of the platform should also improve operational skills and enhance the sense of responsibility of the staff so that they can attach importance to every little detail in production and processing, and can not rush for output but not quality.

If these two points can be achieved, the quality of printing will be improved.