1. Serious uneven dyeing
In this case, the migration of the dye can not be used to repair, and it must be stripped before dyeing. If it is light color or medium color, it can be dyed into dark color. The color stripping methods are as follows:
① Oxidation stripping. Examples of prescription: sodium chlorite 2-5g / L, acetic acid (98%) 2-3g / L, methylnaphthalene or chlorobenzene 3-5g / L. The process is as follows: 30 ℃ treatment, 30 min heating to 98 ℃, boiling treatment for 60 min, water washing. If necessary, it can be bleached with bleaching powder and acetic acid at boiling temperature.
② Restore color stripping. Prescription example: caustic soda (flake) 1g / L, sodium hydrosulfite 5g / L, chlorobenzene 5g / L. Nonionic surfactant 2G / L. The process is as follows: 30 ℃ treatment, 30 min heating to boiling, boiling treatment for 60 min, followed by cold water washing and hot water washing. If the stripping is not enough, it should be treated again, or the oxidation stripping method should be used. The above methods may damage the handle of the fabric, so it should be avoided as far as possible.
2. Wrinkle and slight uneven dyeing
Wrinkle treatment method: put the fabric back into the jet dyeing machine, raise the temperature, the temperature should be slightly higher than the original dyeing temperature, and then slowly cool. The process flow is as follows: dyeing at 60 ℃, heating up to 90 ℃ for 15 min, then heating up to 130 ℃ for 40 min, holding for 60 min, and then cooling. The recovery formula is: disperse dye (determined after test), leveling agent 1-2g / L, pH value adjusted to 5-6. When using dyes with poor dye mobility, the dyeing temperature should be raised to 135-140 ℃, but the mechanical properties should be allowed and the handle of the fabric should not be affected. The disperse leveling agent includes carrier (or repair agent).
3. Oil stain:
① Removal of small batch of local oil spots or dead oil spots. Usually, nonionic detergent, carbon tetrachloride, gasoline and other organic solvents are used to spray with spray gun, and then the fabric is washed by hand.
② Removal of large area oil stains. Degreaser and non-ionic detergent 2-3g / L each were treated at 100 ℃ for 20min, or degreaser and non-ionic detergent 2-3g / L each and high temperature dispersant 1-2g / L were treated at 130 ℃ for 20min.
③ If the oil spots are serious and difficult to remove, they can be dyed into deep royal blue, black and other colors with good coverage.
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