Technology-About wet transfer printing of reactive (acid) dyes
Printing and dyeing enterprises are high energy consumption (power, water, coal) enterprises, and the annual discharge of printing and dyeing wastewater reaches more than 3 billion tons. Water resources on the earth are irreplaceable natural resources. Sewage has become a major environmental problem. Only by protecting water resources can we take the road of sustainable development. This has become the common goal of mankind.
Therefore, it is the goal of the printing and dyeing industry to seek clean production, production with less water, and to develop energy-saving "green printing and dyeing" new technologies, new processes, and new products. After the cold pad transfer printing and wet transfer printing process have emerged, many domestic printing and dyeing enterprises have tried this reactive dye (or acid dye) wet transfer printing, and achieved obvious results.
The so-called wet transfer printing is a method of printing the fabric in a wet state, which is determined by the dye properties in dye transfer printing. This article mainly discusses the process of reactive dyes and acid dyes used in wet transfer printing. Because the color development conditions of reactive dyes and acid dyes must be in a certain state of damp and heat, so that the fiber can be fully expanded, the dye diffuses and penetrates, can enter the fiber gap, and the fiber is combined, so the transfer printing of these two dyes adopts wet The transfer is in full compliance with the principle of dyeing.
