Dyeing color difference, color stripes and flowers, color light reproducibility, dyeing and chemical additive selection, dyeing white spots, rotten cotton spots in the bleaching section, pleats, alkali spots, yellow spots, alkali mud, etc. that are often encountered in the dyeing process. Defects such as wax strips, singe pleats, track marks, etc. How to deal with such defects at the technical level? How to prevent, deal with and solve such defects in production, so as to improve the product quality of dyed fabrics and the success rate of one-time dyeing, and achieve the purpose of saving energy and reducing consumption?
How to improve the success rate of a color test?
If the return color is frequently produced, the pre-treatment process must be stable and consistent to ensure that the roughness, whiteness, and pH value of the semi-finished products produced are consistent each time. Moreover, the laboratory must conduct samples before each dyeing, and small samples of different batches of dyeing materials used must be taken for comparison. If there is no problem, the success rate of one color test will be high, and you can even produce normally without color test (pay attention to the consistent dyeing production process and machine).
If new colors are produced, the laboratory will need to make small samples for confirmation, and the samples must be matched before dyeing. It is best to have different samplers match the samples at the same time. If the two people’s proofing prescriptions are consistent, then The first prescription is close, and the success rate of one color test will be high.
The origin and strength of the dyes and chemicals used must be determined, and it is not advisable to change the origin of the dyes and chemicals frequently. Because there are differences in dye quality, color and light stability, additives, production processes, etc. among various manufacturers, using dyes from different manufacturers will cause a large gap in the first prescription of the returned order, affecting the success rate of the first color test.
How to deal with wrinkles in dyed fabric?
Bleached pleats are more common in high-count and high-density polyester-cotton fabrics and pure cotton thin fabrics. Due to the high hardness of water during production, scale is easily formed during steaming and cleaning and adheres to the cloth guide roller. Long-term production will cause Scale grooves are formed, making the cloth guide roller uneven and the fabric prone to wrinkles. Once pleats are found during production, the car should be wiped and cleaned in time. If pleats are found in semi-finished products during dyeing, reasonable techniques should be used to repair them.
The following introduces several pleat repair methods:
If the bleached fabric is uneven and has temporary creases or mercerization Dry the pleats. If the pleats are lighter, dye them directly without considering the impact on dyeing. If they are heavier, just pre-set them and you can dye them.
If there are obvious pleats on the bleached fabric and there is no fabric damage, the dyeing machine will print black pleats. If the pleats cause fabric damage, the base machine will print a white pleat. For this kind of pleats, high temperature super widening is used and then mercerization is used for repair.
If the bleached fabric has serious dead pleats, and the creases on the fabric have formed aurora marks, this kind of pleats is difficult to deal with, and the fabric can only be stretched at high temperatures. Afterwards, a light sanding process is performed to smooth out the creases, and then they are boiled and bleached again to expand and repair the damaged fabric fibers. Finally, the creases are smoothed out through high-concentration alkali mercerization treatment.
For the repair of pleats, we must first accurately determine the cause of the pleats. Different pleats have different treatment and prevention methods to avoid waste caused by unnecessary processes. For example, pleats during mercerized drying are easier to detect. Once discovered, they should be dealt with promptly. Do not leave the problem to be finalized before dyeing. If the pleats are difficult to handle during drying, you can spin the fabric during mercerizing. This will flatten the folds and use the residual heat of the dropped fabric to iron the pleats, thus saving the need for setting before dyeing.
How to deal with singeing pleats?
During dyeing, there are double or multiple black pleats on the cloth surface after padding in the dye solution, and there are fluffy white wool strips next to the black pleats. These pleats are singe pleats. After the pleats are baked, white marks will appear, and after the color is restored, they will become dark black pleats. The reason for singeing pleats is that the cloth surface is uneven during singeing. The cloth surface wrinkles when it passes through the burner. The high temperature of the burner burns the areas where the pleats are formed. Since the creases cannot be burned, white wool strips remain next to the black pleats. .
Prevent singeing pleats. Do not allow pleats to appear when first singeing, and develop reasonable production processes according to different fabrics. Thick fabrics should be piled or boiled first and then singed to prevent them from burning. The wool enters the fabric and spreads out, reducing the possibility of singeing and pleating. Furthermore, wet drop cloth is used for singeing to prevent high drop cloth temperature and aggravate the formation of pleats.
If you find singeing pleats during dyeing, you must perform pre-treatment and repair before dyeing. Once you drive the car rashly, the black pleats after production and dyeing will not be processed. The pre-treatment method for repairing singeing pleats is very simple. You only need to set the cloth at high temperature to flatten it and then singe it, and then use low-alkali mercerization to eliminate the singeing pleats. </p
