Transfer printing was invented in the 1950s. It promotes the separation of the ink layer from the paper by heat and pressure, and transfers the pattern on the transfer paper to the fabric, that is, the sublimation method. The method has the advantages of convenient operation, high quality of finished products, low equipment investment cost, etc., but most of the heat transfer printing techniques use disperse dyes and transfer onto polyester fabrics. The heat transfer printing dye selection surface is narrow in scope, and many necessary dyes are decomposed into carcinogenic aromatic amines during transfer. In addition, since the sublimation method heat transfer printing ink is prepared by using a solvent, there is a great difficulty in recycling the waste transfer paper, and the environmental pollution is serious when the transfer paper is produced. Due to the above factors, the 0eko-Tex standard that is necessary for the developed countries market cannot be met during the entire process of printing transfer paper and transferring fabrics, resulting in the lack of competitiveness of the products and the inability to break through the green barriers of the market.
Cold transfer printing technology
Cold transfer printing is named after the traditional thermal transfer printing technology. It is a printing method to print a suitable dye ink, printing the pattern or text to be printed on special paper, and printing it into a transfer printing paper. The fabric after the alkali rolling enters the transfer roller together with the transfer paper, and the side of the transfer printing paper with the dye ink is closely adhered to the printed fabric, and the dye ink is detached and peeled off from the paper by pressure, and the transfer printing is performed. The pattern or text on the paper is transferred to the fabric. Therefore, the cold transfer printing is also called "wet transfer printing". The process flow is as follows:
Transfer printing carrier printing paper printing pattern pattern one cold transfer printing cold pile fixing color one water washing type cold transfer printing a wide range of applications, can be used for woven or knitted fabrics, including such as cotton, linen, silk, viscose and so on.
Cold transfer printing technology features
For the severe international market, the development of printing and dyeing in China must pay attention to protecting the environment, improving the efficiency of water resources utilization, vigorously promoting clean production, and developing and promoting various new technologies for reducing pollution, saving energy and benefiting health with the concept of ecological environmental protection. And new products. The emerging cold transfer printing technology has significant advantages in terms of energy saving, sewage discharge and increasing the added value of textile printing due to its unique process.
(1) The new energy-saving and low-consumption cold transfer printing technology has its unique advantages in energy saving, consumption reduction, sewage discharge and the added value of textile printing. Compared with traditional printing, it can save energy by 65%, save dye by 40%, save water by 2/3, and make discharge water recovery rate of 92%. The coloring technology enables the dye transfer rate to reach 95%, achieving the principle of maximizing the use of dyes without leaving no pollution. Simultaneously. In the production process, the cold transfer printing omits the production process of dyeing, washing and bleaching of traditional hot printing, and the production cost of time, personnel and materials is reduced.
(2) Green environmentally friendly cold transfer printing Through the continuous development from a single release coating to a composite coating, paperless transfer printing with a tape or a temporary carrier can now be realized. The printing temporary carrier has good barrier property to the dye ink and can reach a high transfer rate of more than 95%. The cold transfer printing paste contains no urea, which reduces the pollution of air and water: the color paste has sufficient permeability, good dye transferability, high fixing rate, good reproducibility, high yield and reduced Production of production waste.
(3) Quick response according to market demand
The traditional printing is printed, patterned, engraved, etc., and the dye ink is printed on the transfer paper by a printing machine, and then transferred to the textile. After the customer confirms, the large sample can be printed. Cold transfer printing can simplify the complex process of the printing and dyeing industry, and meet the rapid response needs of the market from design, confirmation of samples, order placement, printing and production. In addition, the cold transfer printing pattern is realistic, full of three-dimensional effect, artistic and simple, and its process performance is energy-saving and environmentally friendly, fully complying with the requirements of the “Technical Policy for Prevention and Control of Wastewater Pollution in the Printing and Dyeing Industryâ€.
(4) Increase the added value
The printing market is fiercely competitive. The cold transfer printing adopts the principle of four-color separation, which can embody the rich and colorful photo effects on the fabric, which is comparable to digital printing. The design of the pattern is easy to change, the color is diversified, there can be halftone (color between shades) and light color: the basic color (pattern) strongly drawn; the uniformity of height; almost no defective. Cold transfer printing is not limited by the structure of the fabric, and whether it is a woven fabric or a knitted fabric, it can be transferred to a thick or thin print. For some thick compact fabrics, it can also be transferred simultaneously with double-sided two-layer printing paper to achieve double-sided printing effect and increase the added value of the fabric.
Cold transfer printing is a comprehensive reflection of technological innovation, energy saving and environmental protection and digital printing effects. It basically meets the requirements of clean production. It is one of the most advanced fabric printing technologies with low energy consumption and low pollution emission at room temperature. A revolution in the textile printing and dyeing industry.
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