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The fabric dyeing process that we have to know to do textile and clothing!

Date:Sep 23, 2020

The fabric dyeing process that we have to know to do textile and clothing!


Adaption fabric

 

Arrange the wool embryos from the weaving factory according to the production plan of the dyeing factory, and put the cloth into the cloth car to wait for the subsequent processing.


effect:

① It is generally placed for 12-24 hours to eliminate the tension during weaving and prevent dyeing spots caused by the tension of the fabric during dyeing.

②Open the blanks without open width. For example, it is necessary to wash with water, and to reserve cloth types.


 Washing


mainly used in the process containing OP cloth, which is completed by washing machine (also called scouring).


effect:

①Remove oil, dirt and soil on the fabric. ② Relax fabric tension and internal stress.


Reservation 


Because the fabric contains spandex, spandex is easy to shrink during weaving and it is easy to produce storage creases and wrinkles. Spandex has an oiling process in the production process. When dyeing, try to consider removing the oil and pass the reservation of the fabric.


①It can basically eliminate storage creases and wrinkles;


② Make the oil inside the fabric evaporate to the surface of the fabric through a predetermined high temperature, and remove the oil better after finishing and scouring;


③Eliminate the edge retraction of spandex fabric and improve the quality of front finish dyeing.


Refining


Polyester elastic knitted fabric, due to uneven force during processing, creases and wrinkles are often caused by the shrinkage of spandex. The tension of the fabric is to be released to relax and shrink, but because there is no relaxation mechanism, only Can be refined and relaxed in the dye vat. Because it is refined in the dyeing vat and the dyeing machine has a certain tension, it cannot guarantee the uniform shrinkage of the fabric under the condition of no tension, so there are many abnormalities when processing spandex knitting.


 Dyeing


the main focus includes the following:


①. Requisition-feed water-chemical material-add additives-feed-adjust the temperature rise curve


②. Prone to exceptions:


A. Poor operation. If the dyeing is knotted, it is easy to produce serious stains.

B. The temperature rises too fast, the coloring is too fast in a short time, the holding time is not enough, and the leveling time is not enough.

C. The high hardness during a certain period of time due to water supply.

D. Improper pH adjustment, especially when using high-fastness dyes to make ultra-fine OP-containing fabrics, it is easy to produce color stigma or color difference.

E. Poor compatibility of color formula, poor stability of dyes at high temperature, poor reproducibility, and prone to color blur or color difference.

F. The dyeing vat is not cleaned when the hue of the dyeing row is changed, which results in the staining of oil stains or blocky stains on the cloth surface during dyeing.

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

H. The germ cloth contains a lot of oil, and it is not clean to remove the oil, and it is easy to produce colored flowers in the dirty place during dyeing.

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

J. The dyeing speed is too slow.

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

L. The efficiency of relaxation scouring is not good.

M. The dyeing tank volume is too large.

N. The dyeing machine is not operating normally.

U. The cooling rate is too fast during dyeing, so that the cloth surface from the high temperature directly enters the cold water state to form horizontal small folds.

V. Unreasonable nozzle selection.

W. Poor dye migration.

X. During dyeing, the temperature rises too fast in the dyeing stage, and the tension of the dyeing fabric is too large (this means that the nozzle pressure and the speed of the cloth wheel do not match, resulting in the line speed being too fast.

The tension of the fabric becomes larger), and the color of the crease is different from that of other parts.


 Dye to match 


TFunction to correct the color, so that the color meets customer requirements

  

Dehydration


①Dehydrate as soon as possible after dyeing, because the weight of OP-containing cloth increases when it is watered, and it is easy to produce backlog creases.

②The cage of the dehydrator should be clean to prevent staining and snagging.

③When dewatering, the time should not be too long and the fabrics should not be dewatered too much. Otherwise, it will cause a lot of "colors" on the surface of the fabric due to excessive dehydration.


8. Medium-density reduction washing-the medium-density, can make the dye in the fiber and the unshaped area of the dye sublimate to the surface of the fabric through high temperature, and then go through the tank to reduce the dye to remove the dye on the surface of the fiber. To achieve the purpose of improving color fastness. Another purpose is to make the width and weight.

 

 Reduction washing

The purpose of post-treatment is to remove the floating color on the surface of the fabric, so as to improve the rubbing fastness, washing fastness, sublimation fastness and dye migration fastness of the fabric.


 SETTING


① The filter screen 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 between the left and right pressures from causing unevenness.


③ The air volume of the finalized shape shall be set and the process standard shall be followed to prevent unevenness caused by improper air volume adjustment