Polyester yarn

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The cause of color difference of denim

The development of denim clothing in China has been several decades. Although it started late, it has developed rapidly. At present, cowboy clothing has basically entered the mature stage. With the development of the times, cowboy clothing is also constantly moving forward. At present, China's jeans production bases are mainly distributed in coastal areas, and are gradually developing to the Midwest.

At present, denim clothing in our country is mainly dyed by color weaving. The dyeing of yarn is mainly carried out by pulp dyeing machine, and some of them are dyed by rope dyeing machine or ring dyeing machine. At present, the development trend is toward rope dyeing, because the fastness of rope dyeing is better than that of pulp dyeing. The color light of dyeing is discussed below.

Denim yarn is mainly dyed with indigo, sulfurized dyes and vat dyes. There are mutual chromatic, also have to use a kind of dye purely. The color matching is various, 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 and light. A lot of dyeing factory Masters said that the board color light taken by customers is cyan light, but the color light made by their own start-up is reddish light. At present, most of the popular colors in the market are bluish. Many masters try their best to adjust the color light they want. In fact, the influence of color and light mainly includes the following aspects:

The problem of color and light of dye itself

At present, there are quite a number of dye manufacturers, domestic and foreign. The quality of denim production is not stable, the quality of different manufacturers is not the same, the same dyeing factory produces different batches, the color light is often different. In order to ensure the stability of the dyeing shade, before using the dyes, the dye factory must test and make a comparison between each batch of newly purchased dyes and the previous ones to ensure that the shade is not far away and the quality is stable.

On the formulation of additives

The amount of auxiliaries has a great influence on the color. For example, Indigo is generally used as a reducing agent, such as caustic soda and baking powder. And the amount of caustic soda and baking powder has a great influence on the color of indigo. 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. The same is true for sulfurized dyes and vat dyes.

When the amount of alkali is too large, the color light will be red. Therefore, the dosage of additives must be strictly controlled in the formulation. But the additive should not be too small, because once the additive is less, the color fastness will be very poor. The color and light are inferior. In addition, the quality of auxiliaries is not stable, just like that of dyestuffs. When each batch is purchased, it needs to be tested and tested for quality, so as to ensure the stability of color and light.

Some additives can also change the color and light

For example, some fixing agents will produce the effect of bluish light after they are added. Therefore, it is necessary to know clearly the effect and influence when selecting additives.

Influence of post integration

In fact, this reason can not be said to be the influence of dyeing on the color, because this is the influence of weaving on the color after finishing. Generally after weaving, if you make mercerized cloth, the color will turn red after mercerizing. However, the alkali concentration and washing water in mercerizing have great influence on the color and luster. The alkali concentration is high, and the color is red.

To sum up, in fact, there are many reasons that affect the color and light, so we need to summarize slowly in the production, and pay attention to adjust the color and light according to the customer's board. Make sure that the color light is as close as possible to the customers. In addition, there is also a problem that many power on masters are often difficult to distinguish light and green. Generally, the light color does not look so red, while the bluish light, the dark color, looks red. Indigo, in particular, is obvious. Therefore, we must distinguish the difference between light and green when judging.