Fabric dyeing process

1. Distribution – Arrange the blanks from the weaving factory according to the production plan of the dyeing factory, and place the cloth

Enter the fabric truck and wait for subsequent processes. Effect: ① Generally leave it for 12-24 hours to eliminate the tension during weaving and avoid coloring spots caused by the tension of the gray fabric during coloring. ②Open the unopened blank. For example, if you want to wash it, make a reservation and wait for the type of fabric.

2. Water washing – mainly used for the process of OP cloth, which is completed by washing machine (also called scouring). Effect ①Remove oil, dirt and soil on fabrics. ②Relax fabric tension and internal stress.

3. Predetermination – Because the fabric contains spandex, spandex is easy to shrink during weaving and is prone to storage creases and wrinkles. In addition, spandex has an oiling process during the production process. When coloring, careful consideration must be given to removing the oil. After the gray fabric is Predetermined, ① can basically eliminate storage creases and wrinkles ② through predetermined high temperature, the oil inside the fabric can be evaporated to the surface of the fabric, and the oil can be better removed through pre-finishing and refining. ③ Eliminate the edge retraction of spandex cloth and improve the quality of front-end coloring.

Scouring – Polyester elastic knitted fabrics often suffer from creases and wrinkles caused by the shrinkage of spandex due to uneven stress during the finishing process. It is necessary to release the fabric tension for relaxation and shrinkage, but since there is no relaxation machine, It can only be refined and relaxed in the dye vat. Because it is refined in the dye vat and the dyeing machine has a certain tension, it cannot guarantee that the fabric will shrink evenly without tension. Therefore, when finishing spandex knitted fabrics, more abnormalities will occur.

5. Coloring – the main focus includes the following points:
①. Pick up materials – feed water – chemical materials – add additives – feed materials – adjust the heating curve
②. Anomalies that are easy to occur:
A. Poor operation, if the coloring is knotted, it is easy to produce serious color flowers.
B. The temperature rises too fast, the coloring is too fast in a short time, the heat preservation time is not enough, and the leveling time is not enough.
C. The water quality supply causes high hardness in a certain period of time.
D. The PH value is not properly adjusted, especially when using high-fastness dyes to make ultra-fine OP-containing fabrics that may cause color blooms or Color differences.
E. The color formula has poor compatibility, the dye has poor stability and reproducibility at high temperatures, and is prone to blooming or discoloration difference.
F. The dyeing vat was not cleaned properly when the coloring vat was changing its hue, which resulted in the cloth being stained with oil stains or stains during coloring. Block color flower situation.
G. The size of the nozzle is not suitable and it is easy to produce striped colored flowers.
H. The gray fabric contains a lot of oil and is not clean when the oil is removed. When coloring, it is easy to produce colored flowers in the areas where the oil is not clean.
I. The coloring capacity of the tank is too large or the cloth in the tank is too long.
J. The coloring speed is too slow.
K. The effectiveness of the additives used for coloring is unstable or the compatibility between the dye ingredients and the additives is poor.
L. Relaxation and conciseness are inefficient.
M. The coloring tank capacity is too large.
N. The coloring machine is not operating normally.
U. The cooling speed is too fast when coloring, causing the color to drop directly from the high temperature. After entering the cold water state, the cloth surface forms small horizontal wrinkles.
V. The selection of nozzles is unreasonable.
W. The dye migration is poor.
X. Because of the coloring When the temperature rises too fast during the dyeing stage, the tension of the dyed gray cloth is too high (this means that the nozzle pressure and the cloth wheel speed adjustment do not match, causing the line speed to pass too fast, then
The tension of the fabric increases) and the fabric is folded vertically, and the color at the crease is different from the color of other parts.
6. Sample cutting and color matching – effect color correction to make the color meet customer requirements.
7. Dehydration:
① Dehydrate in real time after coloring, because the weight of the OP-containing cloth increases when it is filled with water. , prone to backlog creases and wrinkles.

②The inside of the dehydration machine cage should be clean to avoid staining and snagging.
③When dehydrating, pay attention to the time It should not be too long, and there should not be too much dehydrated fabric. Otherwise, it will cause a lot of “color flowers” on the surface of the fabric due to excessive dehydration.
8． Mid-setting recovery washing – mid-setting can neutralize the dye in the indeterminate area of ​​the fiber and sublimate it to the fabric through high temperature The surface is washed again in the tank to remove the dye stained on the fiber surface. Achieve the goal of improving the dyeing fastness. Another goal is to make the door width
weight per square meter.
9. Restoration washing – the purpose of post-treatment is to remove floating colors on the surface of the fabric to improve the fabric’s rubbing fastness, washing fastness, sublimation fastness and dye migration fastness.
10. Setting:
① The filter of the setting machine should be cleaned regularly and the temperature in each box should be adjusted reasonably to avoid too large a temperature difference in the oven. uneven.

② Shape over water The left and right pressures of rolling should be kept equal to avoid unevenness caused by the difference in left and right pressures.

③ The setting air volume is required Set process standards and adhere to them to avoid unevenness caused by improper air volume adjustment.

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