Introduction to textiles

(31)Colored Spot
Appearance: The surface of the fabric presents a large area of ​​other color pollution without a certain shape.
Causes:
1. Contamination of the fabric in contact with dyed fabrics of different colors when wet. If the color difference is not the same, it is more obvious.
2. The appliance has not been thoroughly washed during processing or handling.
(32) Scum Spot
Appearance: The surface of the fabric has foam residue attached, and after drying, it becomes a trace of a large piece or a thick strip of white color.
Causes: 1. The dyeing liquid has more foam and adheres to the cloth surface. Mostly due to improper use of dispersants and additives.
2. The reducing liquid has a lot of foam, especially when it is dyed with an anthraquinone dye.
3. In the ** phenol coloring solution, if it contains impurities which cannot be diazotized, foam scum will be formed.
(33) Tarring Strining
Appearance: Aggregation occurs between dyes and dyes and auxiliaries during dyeing, which makes the dyes poorly dissolved. After dyeing, there is a striated or short strip of darker color on the cloth surface.
Causes: 1. The dye is dissolved, the dispersion is poor, 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.