1, the material is not uniform. The main consideration is whether the temperature of the clinker is appropriate, whether it is condensed, and whether it is to be opened or not. When dyestuffs are mixed, they must be mixed evenly. It is best to filter and reduce some large particles and dye particles. The practice of many factories is to filter with a cloth that has a good filterability. This is because it is a cloth factory that is easy to obtain and very effective.
2. Whether the cloth is qualified or not, whether there are defects, whether there is any impurity on the cloth, and whether it is clean. Cleaning after pre-treatment is not clean, especially the acid-base problem on the fabric. The amount of caustic soda added in the pre-treatment should be appropriate to avoid damage to the fabric. Sometimes the fabric part is overtreated with caustic soda, and the coloring may become darker.
3, to consider the water quality, whether there is impurities in the water. The water quality is seriously unqualified, especially if the iron ion content is too large, which can easily cause stains.
4. The temperature rise rate of the dyeing is not good, generally the temperature rises too fast and the dye is not recycled in time.
5. Improper additives used in the dyeing process. It is important to note that the more additives are not used, the better. For example, use bath softeners, which sometimes need to be added to reduce wrinkles. Because the supply of various manufacturers, some can only be used in the cotton, that is, intolerance 130 high temperature, they are also used in polyester, will inevitably cause demulsification, condensation, the formation of stains, its typical performance is oily Partially inhomogeneous dark patches. In addition, after the silicone oil or cationic softener is added at a low temperature in the dyeing tank, the cylinder is not cleaned and has a residue, which is reflected in the dyeing of the lower cylinder. Everyone knows that silicone oil cannot be used at high temperatures and the temperature does not exceed 40 degrees. However, its residual effect on the next cylinder was forgotten.
6, dye compatibility issues. Whether the application of dyes is reasonable and whether the compatibility of different dyes is appropriate; this must be discussed in specific varieties, and the most common problems are cationic and acidic. Of course, the use of dispersion materials in factories is very skillful, such as dark blue and black, poor high-temperature dispersion is poor, if coupled with the use of additives are not resistant to high temperatures, there is a great chance of condensation in the dyeing tank. Of course, for such dyes, the possibility of polyester color flowers should not be large, unless the dyes selected are not compatible with the fibers. If you want to prevent them, you can add a small amount of dye-conducting agent during dyeing to enhance dye migration.
In addition to the above problems, there are also problems such as the use of dyes with poor inferior dispersion strength and high intensity, no use of leveling agents with good dispersion properties, uneven black and dark blue dye materials, and special additives such as silicone oil and water repellent after finishing. When the auxiliaries are reworked to the front to repair chromatic aberration, some need to be peeled off before dyeing; these aspects can easily form serious spots.
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