How to choose the conditions of the sublimation transfer process?
May 20, 2022
The important parameters of the sublimation transfer printing process are temperature, time and pressure during transfer, where temperature and time are the basic conditions.
Transfer Temperature
One crucial aspect of sublimation transfer printing is temperature. The rate of transmission increases with temperature. The transfer temperature should be set higher than the dye sublimation temperature, or, to put it another way, the dye sublimation temperature is the transfer printing temperature, as temperature directly affects dye sublimation. The lowest processing temperature at which the dye starts to sublime. However, the maximum temperature for dye sublimation should be chosen so as to avoid damaging the fiber. As a result, the ideal temperature—generally 200 degrees Celsius—should be carefully chosen taking into account various elements including fabrics and colors.
2. Transfer Time
The thermal transfer time is usually controlled at about 30 seconds. The transfer time consists of two parts here. One is the sublimation time of the dye, and the other is the time for the dye to condense on the surface. Disperse dyes of different colors have different diffusion coefficients. Properly extending the heating time will increase the brightness of the dyes. However, excessively extending the transfer time does not have any practical significance. Instead, it delays the production efficiency and causes the quality of the printed products to decline. Because the temperature is too high and the time is too long, the fiber will feel rough and the color will turn yellow. On the contrary, if the temperature is too low and the time is too short, the transfer effect will be unsatisfactory.
3. Transfer Pressure
To guarantee the transfer quality, the transfer pressure is a crucial component. The better the transfer effect, the higher the pressure. The vaporized dispersion dyes clash and escape in the air, reducing the distance between the fabric and the transfer paper primarily. As a result, the transfer printing color is increased. It is not possible to raise the pressure forever, though. The fabric's non-pressure area and pressure area will clearly indent under excessive pressure. A decompression type ironing machine may be used to guarantee the printed product's appearance quality. vacuum-pumped transfer printing. One such way to apply some of the dispersed dyes that are not sublimated downward is by decompression transfer printing. and can also increase the vividness of the printed color and improve the transfer printing speed.
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