1. Uneven cooking and opaqueness will cause color flowers.
Uneven scouring and uneven removal of impurities on the fabric will cause different moisture absorption rates in parts of the fabric, resulting in colored flowers.
① Inject the scouring additives quantitatively in batches, and the auxiliaries must be uniform. The injection effect of hydrogen peroxide is better at 60-70 degrees.
②The cooking and heat preservation time must be strictly in accordance with the process requirements for heat preservation.
③The dead cloth wrapping process should continue to be kept warm for a while.
2. The scouring water stains are not clear, and the gray cloth is dyed with alkali and causes colored flowers.
After washing the water, neutralize the residual alkali with 10% glacial acetic acid and then wash the water to make the cloth surface PH7-7.5.
3. The residual oxygen treatment on the cloth surface after cooking is not clean.
Nowadays, most of them use deoxygenase additives to complete the deoxygenation treatment. In the normal procedure, glacial acetic acid is quantitatively injected for 5 minutes, and the temperature is raised to 50 degrees and run for 5 minutes. Inject deoxidizing enzyme into the clean water quantitatively, keep it warm for 15 minutes, and take a water sample to measure the oxygen content.
4. Uneven chemical composition and insufficient dye dissolution resulting in color flowers.
Stir with cold water first, then dissolve with warm water. Adjust the temperature of the chemical material according to the properties of the dye. The temperature of the normal reactive dye material should not exceed 60 degrees, and special dyes should be cold-hydrated. Materials, such as brilliant orchid br_v, can be used as separate materials, which must be thoroughly stirred, diluted and filtered before use.
5. The dyeing accelerator (yuanming powder or salt) is added too fast.
Too fast will cause the dyeing accelerator on the surface of the rope-like fabric, with different concentrations, resulting in different dyeing promotion rates on the inside and outside, resulting in color flowers.
① The dye should be added in batches, and each addition should be slow and even.
②Add in batches, less at the beginning and more at the end. Each addition should be 10-15 minutes apart to promote uniform dyeing.
6. Adding color fixing agent (alkali agent) too quickly or too much will cause color blooming.
① Normally, the alkali is injected quantitatively in 3 times, with the principle of less first and then more, the first time dosage is 1%10. The second time 3%10.The last 6%10.
②Add slowly and evenly each time.
③The heating speed should not be too fast. Differences in the surface of the rope-like fabric will cause different color absorption rates and cause color blooming. It is strictly required to control the heating rate (1-2℃/min) to adjust the amount of steam on both sides.
7. The liquor ratio is too small, resulting in color differences.
Many factories now use air flow cylinder dyeing equipment.
Measures: Control the amount of water according to process requirements.
8. Soap colored flowers.
The washing water after dyeing is not clear, the ph content is high during soaping, and the temperature rises too fast, causing color flowers. After heating to the specified temperature, it must be kept warm for a certain period of time.
Wash clean, neutralize some factory-used acidic soaping agents, run in the dyeing machine for about 10 minutes, and then heat up, sensitive colors such as lake blue, color If conditions such as blue are convenient, try to test the pH before soaping.
Of course, with the emergence of new soaping agents, there are low-temperature soaping agents on the market, which is another matter.
9. The dye bath and washing water are not clear, resulting in colored flowers and spots.
The residual liquid after soaping is not washed clearly, so the concentration of residual color liquid on the outside and inside of the fabric is different, and it is fixed on the fabric during drying to form color flowers.
Wash thoroughly after dyeing to remove floating color.
10. Color difference caused by added colors (tank difference, stripe difference) color flowers
①Causes of color difference:
A. The feeding speed is different. If a dye-promoting dose is added�� It has an impact whether it is added in batches. If it is added at one time, the time is short, the dyeing is insufficient, and color flowers are caused.
B. The two sides of the feeding material are rubbed unevenly, causing stripe differences, such as more dark colors on one side and lighter colors on the other.
C. Holding time
D. Color difference caused by different cutting and color matching techniques. Requirements: Cut the sample and match the color using the same technique.
For example: cut the sample 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 liquor ratio: dark color Large liquor ratio: light color
F, the degree of post-processing is different. If the post-processing is sufficient, the floating color is sufficient to be 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, resulting in strip differences
Add color slowly, at least 20 minutes for quantitative injection, and 30-40 minutes for sensitive colors.
②Add ingredients to chase the color
1) Light color condition:
A. First, check the original color Process prescription sheet, weigh the dye according to the degree of color difference and weight of the fabric.
B. The color chasing dye must be fully dissolved, fully diluted, and filtered before use.
C. When chasing colors, add materials at room temperature. The materials should be added slowly and evenly to prevent recoloring caused by excessive operation.
2) Color depth situation
A. Strengthen soaping and sufficient post-processing.
B. Add Na2CO3 for slight decolorization. </p