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What Are the Reasons for the Color Difference of Denim Dyeing

With the development of the times, denim clothing is constantly developing. At that time, China's denim production base was mainly distributed in coastal areas and was gradually developing to the central and western regions. At that time, China's denim clothing was mainly yarn dyed, yarn dyeing was mainly carried out by pulp dyeing machine, and some were dyed by rope dyeing machine or ring dyeing machine. Now the development trend is towards rope dyeing. The reason is that the fastness of rope dyeing is better than that of pulp dyeing. The following denim manufacturers will discuss the color light of dyeing.

What Are the Reasons for the Color Difference of Denim Dyeing 1

At that time, indigo, sulfur dyes and vat dyes were mainly used in denim yarn dyeing. Some are colored with each other, and some are pure with one dye. The color deployment is diverse, and the development of technology has reached a mature stage. But in recent years, many dyeing factories have encountered a very troublesome problem, that is, the problem of color light. Many masters of denim manufacturers say that the color light of the board taken by customers is cyan, but the color light made by their own startup is red. Most of the popular colors on the market are cyan. Many masters can't adjust the desired color and light by any means. Unable to find the reason, in fact, there are the following aspects that affect the color and light.

First, the color and light of the dye itself,

Now, there are many dye manufacturers, domestic and foreign. The quality of production is also unstable. The quality produced by different manufacturers is different. If the same dyeing factory produces different batches, the color light is often different. For indigo, Taifeng and Beijing brands are used more now, and the dyes produced by the two manufacturers are different. The indigo dye in Beijing is relatively stable. It is darker than that of Taifeng, and the color light is a little red (dyed with the same formula and under the same conditions). Other dyes are the same. In order to ensure the stability of dyeing color light, it is necessary to test and beat each batch of newly purchased dyes before using dyes in the dyeing factory, and compare them with the previous ones, so as to ensure that the color light is not far away and the quality is stable.

Second, the formulation of additives,

What Are the Reasons for the Color Difference of Denim Dyeing 2

The amount of dye additives also has a great influence on the shade. For example, indigo, caustic soda and insurance powder are generally used as reducing agents. The amount of caustic soda and insurance powder has a great impact on the dyed indigo color. When the amount of caustic soda is too large, the color light is red, and when the amount of caustic soda is small, the color light is blue. Sulfur dyes and vat dyes are the same. When the amount of alkali is too large, the color light will be biased towards red light. Therefore, it is necessary to strictly control the dosage of additives when adjusting the formula. But the auxiliaries should not be too small, because once there are few auxiliaries, the color fastness will be very poor. The color light is "sub". Other auxiliaries are also the same as dyes, and the quality is unstable. Denim manufacturers have to test the quality when purchasing each batch. This can ensure the stability of color light.

Third, some additives will also change the color lightFor example, some color fixing agents will produce cyan effect in the future. Therefore, when selecting additives, we must understand their role and influence.Fourth, the impact of post consolidation,

In fact, this reason can not be said to be the influence of dyeing on color light, because this is the influence of weaving on color formation in the future. Generally, denim manufacturers will turn red after mercerizing if they make mercerized cloth in the future. The alkali concentration and washing water during mercerization have a great influence on the color and luster. The alkali concentration is high and the color light is red.

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