For the dispersed dyes used in transfer printing, the sublimation temperature should be lower than the melting point of the fiber macromolecules and the fabric strength should not be damaged. The more suitable processing temperature for polyester is 180-210℃. In this temperature range, the molecular weight of the sublimated dyes is between 230-270.
There are generally three types of disperse dyes with a molecular weight in this range:
1. Fast-dyeing disperse dyes: the hair color can be sublimated at about 180°C, and the color will change when the temperature is increased, and the edges will seep.
2. Good disperse dyes: the temperature can be sublimated and colored within the range of 180-210℃. The color curve is flat. The temperature has little effect on dyeing, and it is a more suitable disperse dye for transfer printing.
3. Delayed dyeing disperses dyes: the dyes cannot sublimate and develop color well under the condition of 180-210℃. If the temperature is increased, good color development can be obtained. This type of dye has a strong dependence on temperature when dyeing.
According to the above situation, dyes suitable for transfer printing should meet the following conditions:
(1) The dye for transfer printing must be fully sublimated and fixed on the fiber below 210°C and can obtain good washing fastness and ironing fastness.
(2) The dyes of transfer printing can be fully sublimated into gas phase dye macromolecules after being heated, condensed on the surface of the fabric, and can diffuse into the fiber.
(3) The dye used in transfer printing should have a small affinity for transfer paper and a large affinity for fabrics.
(4) The dye for transfer printing should have bright and bright colors.
4. Color ink for printing transfer paper. Most printing and screen printing processes and equipment are used for printing on transfer paper. The color ink is composed of dyes, vehicles, adhesives, etc. The preparation of the color ink is to mix the above three components and pour them into a colloid mill or a three-roll grinder to grind so that the dye is evenly distributed in the color ink.
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