Causes of color difference in denim

1. The color of the dye itself

At present, there are quite a lot of dye manufacturers, both domestic and foreign. In order to ensure the stability of the dyeing color of denim, the dyeing factory must chemically test each batch of newly purchased dyes before using the dyes, and compare them with the previous ones to ensure that the color is not far different and the quality is stable.

2. The problem of the matching formula of auxiliary agents

The amount of auxiliary agents used in dyes also has a great influence on the color. For example, indigo is generally reduced by caustic soda and insurance powder. The amount of caustic soda and insurance powder has a great influence on the other blue color dyed out. When the amount of caustic soda is too large, the color color will be reddish, and when the amount of caustic soda is small, the color color will be cyan. The same is true for sulfur dyes and reducing dyes.

When the amount of alkali is too large, the color will be reddish. The amount of auxiliary agents must be strictly controlled. But the auxiliary agent cannot be too small, because once the auxiliary agent is less, the color fastness of the dyed color will be very poor. The color is "sub". In addition, the quality of auxiliaries is also possible, just like dyes. Each batch of auxiliaries must be tested and tested for quality when purchased to ensure the stability of the color.

Some auxiliaries will also have the effect of changing the color. For example, some color fixers will produce a cyan effect after being added. Therefore, when replacing auxiliaries, you must understand their role and the effect they affect.

3. The impact of post-finishing

In fact, this reason cannot be said to be the effect of dyeing on the color, because this is the effect on the color after weaving. Generally, after the cloth is woven, if it is mercerized, the color will turn red after mercerization. The alkali concentration and washing water during mercerization have an interactive effect on the color. The alkali concentration is high and the color is reddish.

In summary, there are actually many reasons that affect the color and color, so we must slowly summarize them in production and pay attention to the customer during operation. In addition, there is another problem, that is, many guide masters often find it difficult to distinguish between light and blue. Generally, the color is light and does not look so red, while the color is dark and cyan, which is very obvious. Therefore, when judging, we must clearly distinguish the difference between light and blue.

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