Heat transfer technology can be divided into heat progressive transfer and heat press transfer. Thermal progressive transfer, also known as gas-phase thermal transfer, is to use the dye type with progressive conditions to print the image, landscape, text and other images that need to be printed on the paper in the way of mirror image reversal through lithography, screen printing, intaglio printing and other methods. Then put the paper printed with image and text on the substrate, after heating (generally around 200 ℃) and pressurizing, the ink on the progressive transfer paper will directly change from solid state to gas state, so as to transfer the image and text to the substrate. In this process, the paper used for transfer is called “progressive transfer paper”, and progressive transfer ink is mainly composed of progressive dyes and binders.
The heat press transfer uses the screen printing (or gravure printing) method to print the image and text on the heat transfer paper or plastic, and then transfers the image and text to the substrate by heating and pressing. However, with the popularity of laser printers and ink-jet printers, many small workshops use laser printers to directly print the pictures and texts made by computers on the transfer paper, or use ink-jet printers to print the pictures and texts on the ordinary printing paper, and then use the electrostatic copier to copy them onto the transfer paper. Finally, the pictures and texts on the transfer paper are transferred to the substrate by heating and pressing Things. This is now widely mentioned digital heat transfer technology.