1. Uneven cooking and opaqueness will cause color stains.
Uneven scouring and uneven removal of impurities on the fabric will lead to different moisture absorption rates in parts of the fabric, resulting in colored flowers.
Prevention:
(1) After releasing hydrogen peroxide at 100℃, slowly add other additives in order.
(2) The cooking and holding time should be sufficient.
(3) After the dead cloth is processed, it must be kept warm for a certain period of time (20 minutes)
2. The scouring water stains are not clear, and the gray cloth is dyed with alkali and causes color flowers.
Prevention: After washing the water, use 10% glacial acetic acid to neutralize the residual alkali and then wash the water to make the cloth surface pH 7-7.5.
3. Uneven chemical composition and insufficient dye dissolution causing color flowers.
Prevention: The dye should be beaten with cold water, dissolved in hot water, stirred thoroughly, diluted and filtered before use.
4. The dyeing accelerator (yuanming powder or table salt) is added too fast, so that the surface of the rope-like fabric is covered with dyeing accelerator. The concentration is different, resulting in different dyeing accelerator rates on the inside and outside, resulting in color flowers.
Prevention:
(1) The dye accelerator should be added in batches, and each addition should be slow and even.
(2) Adding in batches should be less at the beginning and more at the end. Each addition should be 10-15 minutes apart to promote uniform dyeing.
5. Adding color fixing agent (alkali agent) too quickly or too much will cause color blooming.
Prevention:
(1) Add in batches, less the first time and more the next time.
(2) Each addition should be slow and even.
(3) The heating rate is too fast, and there are differences in the surface of the rope-like fabric, resulting in different color absorption rates and color blooming.
Prevention: Control the heating rate (1-2℃/min) according to the strict requirements of the process and adjust the amount of steam on both sides.
6. The bath ratio is too highSmall, resulting in color differences.
Prevention: Control the amount of water according to process requirements.
7. The washing water in the dye bath is not clear, causing color flowers.
The residual liquid after dyeing is not washed clean, so the concentration of residual color liquid on the surface and inside of the fabric is different, and it is fixed on the fabric during drying to form color flowers. Prevention: Wash thoroughly after dyeing to remove floating color.
8. What are the causes of color difference (cylinder difference, stripe difference) and how to add materials to chase the color?
(1) Reasons for color difference:
A. The feeding speed is different. If the dosage of dye accelerator is small, it will have an impact whether it is added in batches. If it is added at one time, the time is short, the dye accelerator is insufficient, resulting in color flowers.
B. The two sides of the feeding material are rubbed unevenly, causing uneven stripes. For example, one side is darker and the other is lighter.
C. Heating time: For example, if 8*30‵20‵ is used to sample the cloth, the different shades of the 30‵ cloth will cause color difference.
D. Color differences are caused by different color matching techniques when cutting samples.
Requirements: Cut the sample and match the color using the same technique.
For example: the samples are cut to match the color after being kept warm for 20 seconds, and the degree of washing after cutting is different.
E. Different liquor ratios cause color difference. Small bath ratio: dark color Large bath ratio: light color
F. The degree of post-processing is different. If the post-processing is sufficient, the floating color will be fully removed, and the color will be lighter than if the post-processing is insufficient.
G. There is a temperature difference on both sides and in the middle, causing strip differences.
(2) Add ingredients to chase the color.
1) Light color:
A. First, check the original process prescription and weigh the dye according to the degree of color difference and fabric weight.
B. The chasing dye must be fully dissolved, fully diluted, and filtered before use.
C. When chasing colors, add materials under normal temperature conditions. Add materials slowly and evenly to prevent recoloring caused by too hasty operation.
2) Color depth conditions
A. Strengthen soaping and adequate post-processing. Addition: detergent 2-3% liquor ratio 1:15 95℃×20-40‵
B. Add Na2CO3 for slight decolorization. Na2CO3 2——3% leveling agent 0.5%
1：15—20 95℃×20—40‵
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