Types of Dyes

Acid dyes are mainly suitable for protein fibers, nylon fibers, and silk. They are characterized by bright colors, but have poor wash fastness and excellent dry cleaning fastness. They are widely used in natural dyeing.

(1) Acid dyes are mainly suitable for protein fibers, nylon fibers, and silk. They are characterized by bright colors, but have poor wash fastness and excellent dry cleaning fastness, and are widely used in natural dyeing.

(2) Cation dyes (Basic dyes) are suitable for acrylic, polyester, nylon, cellulose, and protein fibers. They are characterized by bright colors, making them very suitable for synthetic fibers, but they have poor wash and light fastness when used on natural cellulose and protein fabrics.

(3) Direct dyes are suitable for cellulose fiber fabrics, with relatively poor wash fastness and varying light fastness. However, modified direct dyes can significantly improve wash fastness.

(4) Disperse dyes are suitable for viscose, acrylic, nylon, polyester, etc., with varying wash fastness; polyester performs better while viscose performs worse.

(5) Azo dyes (Naphthol dyes) are suitable for cellulose fabrics, characterized by bright colors, and are more suitable for vibrant shades.

(6) Reactive dyes are mostly used for cellulose fiber fabrics and less for protein. They are characterized by bright colors, light fastness, and good wash and abrasion fastness.

(7) Sulphur dyes are suitable for cellulose fiber fabrics, characterized by dull colors, mainly navy blue, black, and brown. They have good light and wash fastness but poor resistance to chlorine bleaching, and long-term storage can damage the fibers.

(8) Vat dyes are suitable for cellulose fiber fabrics, with excellent light and wash fastness, and resistance to chlorine bleaching and other oxidative bleaching.

(9) Coatings are suitable for all fibers; they are not dyes but pigments. Coating dyeing is achieved by mechanically adhering resin (binder) to the fibers. Dark fabrics may become stiff, but the color matching is very accurate, with most having good light fastness and good wash fastness, especially for medium and light colors.

Currently, the dyeing and printing industry is undergoing technological innovation, increasing demand, and intensifying market competition. With the recovery of the global economy, the demand for textiles continues to grow, and the dyeing and printing industry, as an important link in the textile industry chain, is also showing a steady development trend.

Current Situation of the Textile Printing and Dyeing Industry

The textile dyeing and printing industry is an important sector that is widely involved and closely connected to people's lives. Currently, with the development of the global economy and the improvement of living standards, the status of the textile dyeing and printing industry is also constantly changing. Below is a brief overview of the current situation in this industry.

Textile Printing and Dyeing Waste Gas Treatment Technology Solutions

The textile printing and dyeing industry generates a large amount of waste gas during the processing, which not only pollutes the environment but also poses a threat to human health. Therefore, adopting effective waste gas treatment technologies is crucial for the textile printing and dyeing industry. Below are some technical solutions for treating waste gas in textile printing and dyeing.

The three major processes of dyeing and printing.

The preparation of raw fabric includes raw fabric inspection, re-rolling (by batch, by box, printing), and seam sewing. The purpose of raw fabric inspection is to check the quality of the grey fabric and to address any issues promptly. The inspection content includes physical indicators and appearance defects. Burning off the fluff aims to remove the fluff on the fabric surface, making it smooth and aesthetically pleasing, and to prevent uneven dyeing and printing defects caused by the presence of fluff during dyeing and printing. To facilitate smooth weaving, textile factories often apply sizing to the warp yarn to enhance strength and abrasion resistance. The sizing on the grey fabric affects the fabric's water absorption properties, impacts the quality of dyed and finished products, and increases the consumption of dyeing chemicals. Therefore, the sizing should be removed before boiling and processing, a process known as desizing.

Types and Characteristics of Textile Coating and Finishing

Coating finishing is a common textile post-finishing technique, which generally includes the following methods.

The principle of dyeing

The dyeing process of fiber fabrics generally goes through three stages: surface adsorption, internal diffusion, and dye fixation.