Direct Fast Yellow RS

Features of Direct Fast Yellow RS

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1、Direct Fast Yellow RS contain water-soluble groups, the solubility increases significantly with the increase of temperature, For direct dyes with poor solubility, soda ash can be added to help solubilize

2、Direct Fast Yellow RS have higher directness to cellulose fibers than other dyes. At the same time, the direct dye molecules contain amino groups, hydroxyl groups, azo groups and other groups, which can form hydrogen bonds with the hydroxyl groups in cellulose fibers, the hydroxyl groups and amino groups in protein fibers, etc., which further improves the directness of the dye

Direct Fast Yellow RS Basic Data:

Direct Fast Yellow RS Operation Process：

1、 Dip-dyeing: Dip-dyeing is a method of immersing the dyed substance in the dyeing liquid, and through a certain dyeing process, the dye is gradually absorbed by the fiber to achieve the dyeing purpose. This dyeing method does not require high equipment, can be used manually or mechanically, and is not limited by the organization and number of dyes。

2、 Roll dyeing: Direct dyes are used for roll dyeing of fabrics. Compared with dip dyeing, each has its own advantages and disadvantages. Although the penetration of curl dyeing and the covering power of fibers are not as good as those of rope-like impregnation, the flatness of compact fabrics is not as good as impregnation, especially for viscose silk fabrics. Dyeing with loose-roll dyeing machine, the effect is better. There are many varieties used for dyeing by roll dyeing, the main ones are cotton fabrics, viscose fabrics, viscose silk interwoven fabrics, viscose or viscose blended fabrics, etc.

3、 Pad dyeing: In addition to dip dyeing and roll dyeing, direct dyes can also be pad dyeing, referred to as pad dyeing; and because the fabric after pad dyeing must be steam fixed, it is also known as the pad steaming method. The covering power of pad dyeing is the same as that of curl dyeing, which is not as good as rope dyeing, and the pad dyeing is not even enough. In addition, because some common viscose and silk fabrics dyed with direct dyes are generally not suitable for pad dyeing, direct dyes are only used in a small amount for pad dyeing of cotton fabrics.