The development of denim clothing in China has been going on for decades, although it started relatively late, it has developed quite quickly. At present, denim clothing has basically entered the mature stage. With the development of the times, denim clothing is also constantly moving forward. Currently, China's denim clothing production bases are mainly distributed in coastal areas and are gradually developing towards the central and western regions.
At present, denim clothing in China is mainly dyed by color, and yarn dyeing is mainly carried out using a pulp dyeing machine. Some are also dyed using a rope dyeing machine or a circular dyeing machine. The current development trend is towards rope dyeing, because the fastness of rope dyeing is better than that of pulp dyeing. Below, we will discuss the color light of dyeing.
The main dyes used for dyeing denim yarn are indigo, sulfur dyes, and vat dyes. There are mutual color schemes, as well as those that use only one type of dye. There are various color combinations, and the development of craftsmanship has also reached a mature stage. But in recent years, many dyeing factories have encountered a very troublesome problem, which is the issue of color and gloss. Many dyeing masters say that the color light of the boards brought by customers is biased towards blue light, but the color light produced by turning on the machines themselves is biased towards red light. Currently, most of the popular colors in the market are biased towards blue light. Many masters try their best to adjust the desired color and light. In fact, the main factors that affect color and brightness are as follows:
The issue of coloration of dyes themselves
At present, there are quite a few manufacturers of dyes, both domestically and internationally. The quality of denim production is also unstable, and the quality produced by different manufacturers varies. The same dyeing factory produces different batches, and the resulting color and luster are often different. In order to ensure the stability of dyeing color, before using dyes, dyeing factories must conduct laboratory tests and compare each batch of newly purchased dyes with previous ones to ensure that the color difference is not far and the quality is stable.
Formulation issues with the combination of additives
The amount of dye additives also has a significant impact on the color light. Like indigo, it is usually reduced with caustic soda and sodium hydroxide as reducing agents. The amount of caustic soda and insurance powder has a significant impact on the color of indigo dyed. When the amount of caustic soda is too large, the color light produced tends to be red, while when the amount of caustic soda is small, the color light produced tends to be blue. Sulfide dyes and vat dyes are the same.
When the amount of alkali is too large, the color light will shift towards red light. Therefore, it is necessary to strictly control the amount of additives when adjusting the formula. But the amount of additives cannot be too small, because once there are fewer additives, the color fastness of the dye will be very poor. The color light is biased towards "inferior". In addition, additives, like dyes, have unstable quality and need to be tested for quality during each batch of purchase to ensure color stability.
Some additives can also have the effect of changing the color light
For example, some color fixing agents, when added, will produce a blue light effect. Therefore, when selecting additives, it is important to understand their effects and the effects they affect.
In fact, this reason cannot be said to be due to dyeing affecting the color light, because it is the impact on the color when weaving and then finishing. Generally, after weaving, if the fabric is mercerized, the color will turn red after mercerization. The alkali concentration and washing water during mercerization have a significant impact on the color and luster. The alkaline concentration is high, and the color light tends to be reddish.
In summary, there are many reasons that can affect the color and brightness of the product. Therefore, it is important to gradually summarize and adjust the color and brightness according to the customer's requirements during production. Ensure that the color light is as close as possible to the customer's board. In addition, there is another issue that many startup technicians often find it difficult to distinguish between light and green. Generally, when the color is light, it may not look as red, but when it is dark, it may appear more red. Especially indigo, it's very obvious. So when making judgments, it is important to distinguish between light and green.
Cowint is the largest DTF Film Factory in China
