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What is the principle of thermal transfer printing?

Update:21-09-2019
Summary:

The principle of thermal transfer printing is somewhat […]

The principle of thermal transfer printing is somewhat similar to the transfer printing method. In thermal transfer printing, a pattern is first printed on paper with a dispersion-containing dye and a printing ink, and then the printing paper (also referred to as a transfer paper) is stored for use in a textile printing factory.
When the fabric is printed, the transfer paper and the unprinted face-to-face are pasted together through a thermal transfer printing machine (as shown in Fig. 9-10), and the machine is passed at a temperature of about 210 ° C (400 T). The dye on the transfer paper sublimes and transfers to the fabric to complete the printing process without further processing. The process is relatively simple and does not require the expertise necessary for drum printing or rotary screen printing (see Figure 9-11).
Disperse dyes are the only dyes that can sublimate, in the sense that they are the only dyes that can be thermally transferred, so the process can only be used on fabrics that have affinity for such dyes, including acetate fibers, propylene. Nitrile rayon fiber, polyamide fiber (nylon) and polyester fiber.
In thermal transfer printing, fabric printing plants purchase such printing paper from highly specialized printing paper manufacturers. Transfer paper can be printed according to the requirements of the pattern designer and the customer (off-the-shelf patterns can also be used for transfer paper printing). Thermal transfer printing can be used to print pieces (such as border printing, chest embroidery, etc.). In this case, a specially designed pattern is used.
Thermal transfer printing stands out as a complete fabric printing method from the printing process, thus eliminating the need for large and expensive dryers, steamers, water washing machines and tenters.

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