Thermal Transfer

How it works:

Thermal transfer printing creates an image by melting solid ink coated on a filmic ribbon and transferring it onto a receiving material. The receiving material can be uncoated paper , coated paper or a film. The best results are achieved with the use of carefully selected materials. A suitable ribbon must be used in combination with an appropriate and correctly set printing device.

Printers and thermal print heads

Standard thermal transfer printers, which have a resolution of 8 dots/mm and work at speeds below 240mm/s, use flat thermal print heads.Wth flat type print heads, the time taken to transfer the ink is suffieciently long so that the receiving face material doesn't need a special coating to enhance its absorbency or smoothness.High-speed printers with resolutions of 12-24 dots/mm usr near-edge/corner-edge print heads. At printing speeds higher than 240 mm/sec, the ink is transferred very quickly as the ribbon is removed while the ink is still molten. With this type of thermal head, a special ribbon is required as well as a specialcoating on the face material. This coating should have specific absorption properties that provide fast ink transfer but allow the material to retain good pre-press properties including for water-based flexo.

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