Thermal Transfer Printing - 2
Thermal-transfer printing is done by melting Wax or Resin or a blend of the two within the print heads of a specialized printer.
The thermal-transfer print process utilises three main components: a non-movable print head, a carbon ribbon (the ink) and a substrate to be printed, which would typically be paper, synthetics, card or textile materials. These three components effectively form a sandwich with the ribbon in the middle.
A thermally compliant print head, in combination with the electrical properties of the ribbon and the correct rheological properties of the ribbon ink are all essential in producing a high-quality printed image.
For more: https://en.wikipedia.org/wiki/Thermal-transfer_printing