Basic knowledge of heat transfer technology: several processes of transfer printing
The transfer printing process mainly includes the following:
1. Sublimation method
This is the most commonly used method, using the sublimation characteristics of disperse dyes, using disperse dyes with a molecular weight of 250~400 and a particle diameter of 0.2~2 microns and a water-soluble carrier (such as sodium alginate) or alcohol-soluble carrier (such as ethyl acetate) cellulose) and oil-soluble resin to make ink, and process it on a transfer printing machine at 200~230°C for 20~30 seconds, so that the disperse dyes are transferred to synthetic fibers such as polyester and fixed.
2. The transfer method
The dyes in the ink layer of the transfer paper are selected according to the properties of the fibers. The fabric is first treated by padding with a mixed solution composed of color-fixing auxiliaries and paste, and then transferred to the fabric from the transfer printing paper by hot-pressing electrophoresis in a wet state, and then the dye is transferred from the transfer printing paper to the fabric and fixed. Finally, it is steamed and washed. Wait for wet treatment. During dye transfer, greater pressure is required between the fabric and the transfer paper.
3. Melting method
The ink layer of the transfer paper is based on dyes and waxes. By melting and pressing, the ink layer is embedded in the fabric, so that part of the ink is transferred to the fiber, and then the corresponding post-processing is performed according to the properties of the dye. When the fusion method is adopted, a larger pressure is required, and the transfer rate of the dye increases with the increase of the pressure.
4. The ink layer peeling method
Using the ink that can produce strong adhesion to the fibers after being heated, the entire ink layer can be transferred from the transfer paper to the fabric under a relatively small pressure, and then the corresponding color fixing treatment is carried out according to the properties of the dye.