The principle of dyeing

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

(1) Surface Adsorption

When the fiber fabric is immersed in the dye solution, the dye is quickly adsorbed onto the surface of the fiber, which is the initial stage of the dyeing process. If the dye has a high affinity and concentration, along with an appropriate amount of electrolyte, it will increase the speed at which the dye is adsorbed by the fiber, facilitating the dyeing process.

(2) Internal Diffusion

Once the dye is adsorbed on the fiber surface, it begins to diffuse into the fiber. The diffusion of the dye into the fiber is the longest stage in the entire dyeing process. In the dye solution, the dye on the fiber surface diffuses into the fiber where the concentration is lower, continuously replenishing the dye on the fiber surface until the dye concentration on the fiber reaches equilibrium with the dye concentration in the solution. When the diffusion of the dye into the fiber is completed, the adsorption of the dye on the fiber surface is also completed. Therefore, adsorption and diffusion are inseparable processes that occur simultaneously.

(3) Dye Fixation

When the dye has been adsorbed and diffused, adhering and penetrating into the surface and interior of the fiber, various chains are fixed onto the fiber in the form of bonds. Since the dye and fiber are different, the forms of fixation between them also vary. Due to the differences in fixation forms, the firmness of the dyeing also varies.

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.