Fabric dyeing process

into the cloth car to wait for subsequent processes. Function: ① Generally leave it for 12-24 hours to eliminate the tension during weaving and prevent dyeing spots caused by the tension of the gray fabric during dyeing. ②Open the unopened blank. For example, if you want to wash it with water, you can order different types of fabrics.

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

　3． Reservation – Since the fabric contains spandex, spandex is prone to shrinkage and storage creases and wrinkles during weaving. In addition, spandex has an oiling process during the production process. When dyeing, try to consider removing the oil. Through the reservation of the gray fabric, ① It can basically eliminate storage creases and wrinkles ② The oil inside the fabric is evaporated to the surface of the fabric through a predetermined high temperature, and the oil is better removed through pre-scouring. ③ Eliminate the edge retraction of spandex cloth and improve the quality of pre-finishing dyeing.

4． Refining – Polyester elastic knitted fabrics often have creases and wrinkles caused by spandex shrinkage due to uneven stress during processing. It is necessary to release the fabric tension and relax and shrink. However, since there is no relaxation machine, only Can be refined and relaxed in the dye vat. Since it is refined in the dye vat and the dyeing machine has a certain tension, it cannot ensure that the fabric shrinks evenly under tension-free conditions, so when processing spandex knitting, more abnormalities occur.

5． Dyeing – the main focus includes the following points:

　①. Pick up materials – feed water – chemical materials – add additives – feed materials – adjust the heating curve

　②. Abnormalities that are easy to occur:

A. Poor operation and knotting in dyeing can easily produce serious color flowers.

B. The temperature rises too fast, and the coloring is too fast in a short period of time. The heat preservation time is not enough, and the leveling time is not enough.

C. The hardness is high in a certain period due to water supply.

D. Improper adjustment of pH value, especially when using high-fastness dyes to make ultra-fine OP-containing fabrics, color blooms or color differences are prone to occur.

E. The color formula has poor compatibility. The dye has poor stability and reproducibility at high temperatures, and color blooms or color differences are prone to occur.

F. The dyeing vats were not cleaned properly when the dyeing vats were changing hues, resulting in oil stains or lumps of color on the cloth surface during dyeing.

G. The size of the nozzle is not suitable, and it is easy to produce striped colored flowers.

H. The gray cloth contains a lot of oil and the oil is not clean. When dyeing, it is easy to produce colored flowers in the areas where the oil is not clean.

I. The dyeing tank capacity is too large or the cloth in the tank is too long.

J. The dyeing speed is too slow.

K. The effectiveness of the auxiliaries used in dyeing is unstable or the compatibility between the dye factors and the auxiliaries is poor..

L. The relaxation and refining efficiency is poor.

M. The dyeing tank capacity is too large.

N. The dyeing machine is not operating normally.

U. When dyeing, the cooling speed is too fast, so that the cloth surface forms small horizontal wrinkles from high temperature directly into cold water.

V. The selection of nozzles is unreasonable.

W. The dye migration is poor.

The phenomenon in which the tension of the fabric increases) and the color of the fold is different from the color of other parts.

6． Cutting samples and matching colors – correcting the color to make it meet the customer’s requirements.

7． Dehydration:

① Try to dehydrate as soon as possible after dyeing, because the weight of OP-containing cloth increases when it is filled with water, and it is easy to produce backlog creases and wrinkles.

② The inside of the dehydration machine cage should be clean to prevent staining and snagging.

③When dehydrating, be careful not to take too long, and not too many fabrics are dehydrated. Otherwise, it will cause a large number of “color flowers” on the surface of the fabric due to excessive dehydration.

8. Neutralization and reduction washing – After neutralization, the dye in the unfixed area of ​​the fiber can be sublimated to the surface of the fabric through high temperature, and then the dye stained on the surface of the fiber can be removed by reduction washing in the tank. . To achieve the purpose of improving color fastness. Another purpose is to make door width

Weight.

9． Reduction washing – the purpose of post-treatment is to remove floating colors on the surface of the fabric, thereby improving the fabric’s rubbing fastness, washing fastness, sublimation fastness and dye migration fastness.

10． Chengding:

① The filter of the setting machine should be cleaned regularly and the temperature in each box should be adjusted reasonably to prevent the temperature difference in the oven from being too large and uneven.

② The left and right pressures of the finalized water rolling should be controlled to be the same to prevent the difference in left and right pressures from causing unevenness.