In the process of dyeing, we often encounter dyeing color difference, stripe color flower, color light reproducibility, dyeing additives optimization, dyeing white spots, bleaching section rotten cotton spots, pleats, alkali spots, yellow spots, alkali mud, wax strips, singeing pleats, track marks and other defects. How to deal with such defects at the technical level? How to prevent, deal with and solve such defects in the production, so as to improve the product quality of dyed cloth and the success rate of dyeing, to achieve the purpose of energy saving and consumption reduction?

How to improve the success rate of a color test?

If it is a frequently produced single color, the pre-treatment process should be stable and consistent to ensure that the gross efficiency, whiteness and pH value of the semi-finished products are consistent each time. And before each dyeing, the laboratory should carry out a sample, and the different batches of dye materials used should be made small samples to compare. If there is no problem, the success rate of a color test will be high, and even normal production can be done without color testing (pay attention to the same dyeing production process and machine).

If the new color is produced, the laboratory should confirm the sample, and before dyeing, it is best that different samplers at the same time, if the two proofing prescriptions are consistent, then the first prescription is close, and the success rate of a color test will be high.

The origin and force of the dye material used should be determined, and it is not appropriate to change the origin of the dye material often. Because of the differences in dye quality, color stability, additives, and production processes among different manufacturers, the use of dyes from different manufacturers will make the difference between the first prescription of the return order and affect the success rate of color testing.

How to deal with dyed cloth pleats?

Bleach pleats are more common in high density polyester cotton fabrics and pure cotton thin fabrics. Due to the high hardness of water in production, scale is easy to form when steaming and washing, and it is easy to adhere to the cloth guide roller. Long-term production will form scale grooving marks, making the cloth guide roller uneven, and the fabric is easy to pleats. Once the pleats are found in the production, the car should be cleaned in time, and the semi-finished product is found to have pleats when dyeing, and a reasonable process should be used for repair.

The following describes several tuck repair treatment methods:

If the bleached cloth is uneven temporary crease or mercerized drying pleats, if it is relatively light, it is directly dyed, do not consider the influence on dyeing, if it is relatively heavy, as long as the predetermined type can be dyed.

If the bleached cloth has obvious pleats, no fabric damage is formed dyeing bottom machine is black pleats, if the pleats form fabric damage, the bottom machine is a white pleats. The creases are repaired by high temperature overwidth and then mercerizing.

Bleached cloth if the dead pleats are serious, and the creases on the cloth have formed aurora prints, this wrinkle is more difficult to deal with, can only be carried out in the future after the cloth is stretched at high temperature and then light grinding process, the creases aurora prints are smoothed, and then re-cooked and bleached, so that the damaged fabric fibers are expanded and repaired, and finally the creases are smoothed by high concentration alkali mercerization.

For the repair of the pleats, it is necessary to accurately determine the cause of the pleats, and the prevention methods of different pleats are different to avoid unnecessary process waste. For example, mercerizing drying pleats are better to find, and should be dealt with in time after being found, and do not leave the problem to be fixed before dyeing. If the drying pleats are not good to deal with, you can hit the shaft when mercerizing the cloth, so that the drying fold is flat with the cloth remaining temperature to iron the pleats flat, so that you can save the styling before dyeing.

How to deal with singeing pleats?

There are two or more black folds on the cloth surface after dipping the dye solution during dyeing, and there are hairy white hairs next to the black folds, which are the burning folds. This pleats will show a white mark after baking, and until the reduction of color after a deep black pleats. The crease is caused by the uneven surface of the cloth when the wool is burned, the crease is wrinkled when it passes through the crater, and the place where the crease is formed is scalded by the high temperature of the crater. Because the crease is not burned inside, the black crease leaves white furs next to it.

Prevent the fleece when the first fleece can not produce pleats, and according to different fabrics to develop a reasonable production process, for thick fabrics should be piled or cooked before the fleece, so that the fleece into the cloth flat, reduce the possibility of fleece. In addition, the singeing uses wet cloth to prevent high cloth temperature and aggravate the formation of pleats.

If there are burning pleats found during dyeing, be sure to carry out pre-treatment repair and then dyeing, once you rush to drive, the black pleats after dyeing will not be processed. The method of pre-treatment to repair the singeing pleats is very simple, as long as the high temperature setting will pull the cloth flat and then singeing, and then low alkali mercerization can eliminate the singeing pleats.