Introduction of textile defects

(31) Colored Spot
Appearance: The surface of the fabric presents a large area without any color pollution of a certain shape.
Causes:
1. Pollution that occurs when the fabric is in a wet state when it comes into contact with dyed fabrics of different colors. The difference is more obvious if the color difference is different.
2. During processing or handling, the appliance has not been thoroughly washed.
(32) Foam pollution (Scum Spot)
Appearance: There are foam residues attached to the surface of the fabric. After drying, it becomes a large piece or thick strip with a slightly white color.
Causes: 1. There is a lot of foam in the dyeing liquid, which adheres to the cloth surface. Mostly due to improper use of dispersants and additives.
2. There is more foam in the reducing solution, especially when it is reduced after being dyed with urn dye.
3. If the phenolic coloring liquid contains impurities that cannot be diazotized, foam scum will form.
(33) Tarring Strining
Appearance: During dyeing, the dyes agglomerate with each other and between the dyes and the additives, which makes the dyes poorly soluble. After dyeing, dark stains of stripes or short stripes occur on the fabric surface.
Causes: 1. The dye dissolves and disperses poorly, or the dye is mixed with other chemicals, and the hardness of the dyeing water is too high.
2. The combination of dyes and additives is not suitable, or the timing and order of additives are not appropriate