Views: 5 Author: Site Editor Publish Time: 2022-11-04 Origin: Site
The so -called wet transfer printing is the method of printing the fabric in a wet state, which is determined by the dye dye performance in the dye transfer printing. This article mainly discusses the process of active dyes and acidic dyes for wet transfer printing. Because active dyes and acidic dye hair color conditions must be fully expanded in a certain damp -heat state, the dye diffuses and infiltrates, and the fiber gap and fiber are combined. Therefore The transfer of dyeing is fully in line with the principle of dye.
After testing, when the water content of cotton fiber is 30%, the color of the dye is the highest. This is because the water content of the cotton fabric is 30%of the critical moisture content, and the fiber has the largest degree. With water, the structure size of the fiber reaches the maximum value, which means that the internal structure of the fiber can be closer to the maximum, which can maximize the dye into the inside of the fiber.
When the moisture content of fabrics is less than 30%, the fiber tunnel is insufficient in water, and the dye dissolving and fibrous expansion are insufficient. When the water content is more than 30%, the free water increases sex. The critical moisture content of different fibers is also different, such as 38%of adhesive fibers, about 13%nylon, and about 1%polyester. Therefore, in the transfer printing, polyester fiber is the earliest success, and there is no need to bake and washing after the heat transfer. It is that the critical moisture content of polyester fibers is only 1%. Usually, the polyester fabric will have this moisture content rate And the purpose of smoothly reaching heat transfer printing. Then to make the transfer printing of cotton or real silk to achieve the effect of polyester transfers, the only way is to make the water content of the fabric reaches its critical moisture content. The active (acidic) dye -free washing and transfer printing of cotton cloth (real silk) uses this principle to make the moisture content of the fabric entering the transfer printed fabric reaches its critical moisture content, and then immediately transfer printed and baked.
Under the critical water content conditions of fabrics, the role of urea as a hygroscopic agent is not obvious, because under this condition, the fiber has been fully bloated, and the dye is dissolved in the fiber. Even at high temperatures, urea does not form a low -melting of dye with dyes and is used as a color medium. On the contrary, it will react with the active dye to reduce the solidity rate. Therefore, there is no need to use urea as a hygroscopic agent in the metastasis of the active dye, so that the printing process is much simpler.
Alkaline is a must, which is a necessary pH condition for active dye hair color. It can be supplied at the same time when the fabric is humidified to achieve the purpose of balanced hair color.
Wet transfer printing is to use the fabric to the maximum swelling of fiber with a critical moisture content of 30%, and the dye can maximize the amount of hair color without auxiliary agent. The realization of this process will be the printing and dyeing industry. An important change. This is the moist dye wet transfer printing, which is also called a waterless printing. I think it is more appropriate to call the watermark, because it must be cleaned slightly to remove the base of the cloth surface. Make print fabrics achieve excellent finished products. If it is a wet transfer printing of acid dyes, it can be called almost watermark. Because the prescription does not contain other soluble or hair color, and the real silk fabric with slightly acidicity is a kind of protection of the silk, which will make the silk feel good and silk.
The wet printed printing of leather, silk, wool, and nylon has been successful, and the wet transfer printing of all cotton fabrics is entering industrial production.