Note 丨 丨 丨 硫化 硫化 硫化 硫化 硫化 解决 解决 解决 解决 解决

Sulfur cyan is one of the most easily oxidized dyes that can naturally oxidize in the air. When the reducing power of the dyeing liquid is insufficient, the dye on the cloth roll slowly oxidizes, and the reduced body becomes an oxidized body and gradually adheres to the surface of the fabric to form a floating color (bronze), which is commonly called "red ribs".
Overcome ways:
1, the amount of sulfuric alkali should be sufficient, generally 100% cyanide: 60% sulfide base = 1:1.
Here are three things to note:
First, the strength of homemade cyanide is high or low (100% to 150%), and the amount of sulfurized alkali should also be increased or decreased according to the level of dye strength.
Secondly, in domestically produced solid sulfuric alkalis, the active ingredient (sodium sulfide) content is different from 50 to 62%, and 60 to 62% of high-concentration products are translucent orange-red or orange-yellow crystals, and the content is 50 to 58%. Red-brown solid. After disassembling the sulfide base, it is exposed to the air and easily oxidized to an off-white powder, which reduces or even completely loses the reducing performance. Therefore, attention should be paid to selecting and strengthening assay tests before use.
Third, the amount of sodium sulfide should not be too much, otherwise it will reduce the amount of color.
2. In the course of vulcanization of blue or cyanuric acid, if necessary, the dyeing liquid can be used to pour the edge (that is, every two moments, using the dye liquid to roll the two ends of the cloth) so that the two ends of the roll can always maintain a good reduction state and prevent oxidation. This will prevent the occurrence of "red edge" disease.
3. In the process of dyeing, it is necessary to cover as much as possible so that the fabric is enveloped in a reducing gas to reduce the contact of the dye with air (oxygen).
4, the end of dyeing, water should be discharged as soon as possible, not slow, in order to shorten the natural oxidation time of the roll, and the amount of water should be large (large flow), so that the residue on the fabric before the oxidation is quickly removed to reduce the fabric Floating color generation. If necessary, after dyeing, dilute solution of alkali sulfide can be used to clean 1~2 lanes at 40~50°C, so that the cloth surface has formed a floating color, re-reduced and dissolved, and then washed with a large stream of water.
5, the volume dyed cyanide, the amount of dye is more, the material must be uniform, if the dye is poorly dissolved, it will cause a large number of dyes attached to the fabric surface, after dyeing to produce bronze strips. The usual method is: the dye is first homogenized with the appropriate amount of hot water (adding the appropriate amount of Taikoo oil and blended), and then poured into the foot dyeing machine (contains full amount of sulfurized alkali and 2-3 g/l soda ash ), Heat to boiling with stirring, and boiled for 5 to 10 minutes, so that the dye fully dissolved dissolved, and then flushed to the specified amount and temperature adjusted to the prescribed temperature and then drive dyeing.
6. The cloth roll should not be too large (too long), and it should be less than 10 minutes for each lane to prevent the cloth roll from being exposed to the air for too long. Some dyes will oxidize and promote the production of "red bars".
7. The semi-finished products used for dyeing have good effect on the water absorption (water absorption), and also have a direct effect on the level dyeing. The semi-finished product with high gross effect and evenness has good curling effect.

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