The preferred dyeing method is different, and the color obtained is different in depth, level dyeing, penetrating dyeing, and fixing effect. Here are several different dyeing methods for analysis and discussion.


(1) Dip dyeing method


Dye dyeing, the fabric can have sufficient time to react with the dye at a certain temperature, through adsorption → diffusion → dyeing, the dye and fiber are fully dyed and penetrated, and it has a higher fixation rate and Brightness and color fastness.


(2) Cold rolled pile method


Cold pad-batch dyeing is to roll the fabric through room temperature pad dyeing solution and lye. After a long time of slow rotation, after stacking at room temperature, it is unrolled and washed with water and soaped to achieve the purpose of full dyeing. This method is the best method for energy saving, environmental protection, and small batch production; it is the dye and the fiber fully absorb and react for a long time, and it has good dye uptake, fixation, level dyeing and transmittance, so as to obtain good color fastness. Spend.


(3) Wet short steaming method


The wet short steaming dyeing is an energy-saving dyeing method. The fabric is steamed directly after the padding liquor, and the fixation is carried out under high temperature and high humidity, so as to achieve the purpose of fast dyeing and fixation, and has a good dye uptake rate It has high color yield and bright color, and can obtain good washing and rubbing fastness.


(4) Pad dyeing method


There are two process methods for pad dyeing: one is rolling→drying→rolling→steaming; the other is rolling→drying→steaming. The first is to roll the dye first and then the color fixing solution, steaming is steaming to achieve the purpose of dyeing and fixing. The second type is pad dyeing and fixing and steaming after drying in the same bath, that is, dry steaming. The dyeing depth of the latter is 20% deeper than the former, but the various fastnesses are lower than the former; therefore, the former is used more, but for depths that cannot be reached by wet steaming, dry steaming can be considered; but it should be used for finishing. Fixing agent to improve the color fastness of fabrics.


Fixation reaction is the most important stage of reactive dye dyeing. The entire process of dyeing must be controlled in a direction that is conducive to fixation reaction and inhibits hydrolysis reaction in order to obtain the highest fixation rate.


The more the amount of dye, the more floating dye. Therefore, based on the dyeing depth of the standard sample, the amount of dye should be appropriate. The fiber’s adsorption of each dye has a limit value, that is, the saturation value of dyeing, which is generally not exceeded About 10% of the saturation value. When the amount of dye exceeds the saturation value, the excess dye cannot be dyed and fixed, and can only accumulate on the surface of the fabric, which will affect the rubbing fastness of the fabric. Reactive dyes with high lifting power should be used. High dye uptake rate.


After the fabrics dyed by the above dyeing methods pass the test, it is found that the preferred color fastness is: dip dyeing>cold pad pile>wet short steaming>rolling→baking→rolling→steaming>rolling→baking→steaming. The color rate is high, the color is bright, and good washing and rubbing fastness can be obtained.

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