Notes on the Prevention and Treatment of Common Quality Problems of Dyeing with Reactive Dyes

The scouring is uneven, and the impurities on the fabric are not evenly removed, so that the moisture absorption rate of the fabric is different, resulting in color flowers.

prevention:

(1) Slowly add other additives after releasing with hydrogen peroxide at 100°C.

(2) The scouring and holding time should be sufficient.

(3) Keep the insulation for a certain period of time (20 min) after dead cloth treatment

2 , scouring water stains, germinal cloth with alkaline staining caused by color flowers.

prevention:

After cleaning the water, 10% glacial acetic acid neutralized the residual alkali and then washed the water, so that the cloth surface PH7-7.5.

3 , the material is not uniform, the dye is not dissolved enough to cause color flower.

prevention:

The dye should be beaten with cold water, then dissolved with hot water, fully stirred, diluted and used after filtration.

4. Accelerating agent (Summary powder or salt) is added too fast, so that the dyeing agent is carried on the surface of the rope-like fabric, and the concentration is different. This results in different surface-to-induction dyeing rates and forms color flowers.

prevention:

(1) The accelerant should be added in batches. Each addition should be slow and uniform.

(2) Add in batches should be less than the previous time, followed by more, add 10-15 minutes apart, so that uniform dyeing.

5 , fixing agent (alkaline agent) added too fast, too much, resulting in color flowers.

prevention:

(1) Add in batches, last time less, more times later.

(2) Slowly and evenly each time.

6. The heating speed is too fast, and the difference in the surface of the rope-like fabric causes a difference in the color-receiving rate.

prevention:

According to the strict requirements of process control heating rate (1 - 2 °C / min) adjust the amount of steam on both sides.

7 , bath ratio is too small, causing color difference color.

Prevention: Master the amount of water according to the process requirements.

8 , dye bath washing water is not clear, resulting in color flowers.

After dyeing, the residual liquid is not clean, and the residual concentration of the residual liquid is different from the surface of the fabric, and the color is fixed on the fabric during drying.

Prevention: Wash the water thoroughly after dyeing to remove floating color.

9. What is the cause of the color difference (aberration, difference) and how to carry out color recovery?

(1) Causes of color difference:

A. The feeding speed is different. If the accelerating dose is added in small amounts, whether or not it is added in different portions has an effect, such as a one-time addition, a short time, and insufficient promotion, resulting in coloration.

B. On both sides of the feeding, the unevenness of the enthalpy results in a difference, for example, one side is darker and the other side is lighter.

C. Holding time: If 8*30‵20‵ samples the cloth, 30‵ will cause different shades due to different shades of cloth.

D, color-cutting causes different colors.

Requirements: The same technique is used to cut the color.

For example: After 20 years of incubation, the sample is color-matched and the degree of washing after the sample is different.

E, color difference caused by different bath ratios. Small bath ratio: color depth

Large bath ratio: light color

F, different post-processing. The post-treatment is sufficient, the floating color is removed sufficiently, and the color is lighter than that after the treatment is insufficient.

G, on both sides, there is a temperature difference, resulting in a difference.

(2) feed color recovery.

1) Light color condition:

A. First, check the prescription of the original process and weigh the dye according to the degree of color difference and the weight of the fabric.

B. Chromophore dye must be fully dissolved, fully diluted, and used after filtration.

C, chasing color corresponds to feeding at room temperature conditions, feeding the corresponding slow, uniform, to prevent the operation too quickly caused by color flowers.

2) Color depth

A, strengthen soaping, full post-processing. Addition: detergent 2-3%

Bath ratio 1:15 95°C×20-40°

B. Add Na2CO3 for slight decolorization.

Na2CO3 2 - 3% levelling agent 0.5%

1:15-20

95°C×20-40°

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