A printing method includes preparing a dye receiving zone. Then, sublimation transfer paper is stuck to the dye receiving zone. Then, ink on the sublimation transfer paper is released in a heat pressing manner and permeates the dye receiving zone so that the interior of the dye receiving zone forms multiple blocks of color warning areas. Then, the sublimation transfer paper is removed from the dye receiving zone. Then, the dye receiving zone is cleaned. Finally, the dye receiving zone is worked and molded to have a determined profile. Thus, when the dye receiving zone ages and becomes thin due to a successive loss during a use procedure, the color warning areas in the dye receiving zone are exposed gradually, so that the user judges if the dye receiving zone needs to be replaced according to the loss extent of the dye receiving zone.

An image forming method including preparing a thermal transfer sheet having a dye layer on a substrate, the dye layer containing a sublimable dye, preparing a decorative seal having a seal base material on a release sheet, the seal base material having a layered structure of an adhesive layer and a film layered in this order from the release sheet side, the film containing a resin having a dyeing affinity to the sublimable dye contained in the dye layer, and the film having an elongation percentage of not less than 150% and not more than 400% when determined by a test method in conformity with JIS-K-7127:1999, and thermally transferring the sublimable dye in the dye layer onto the seal base material by sublimation thermal transfer process, thereby forming a thermal transfer image on the seal base material.

A thermal transfer printer includes a first supply unit configured to supply an intermediate transfer medium in which, on one surface of a first base, a transfer layer including a receiving layer is disposed, a second supply unit configured to supply a thermal transfer sheet in which, on one of surfaces of a second base, a colorant layer and a particle layer are disposed, a printing unit configured to heat the thermal transfer sheet, to transfer a colorant from the colorant layer to the receiving layer to form an image, and to transfer the particle layer onto the receiving layer, a third supply unit configured to supply a transfer-receiving body, and a transfer unit configured to place the intermediate transfer medium and the transfer-receiving body on top of each other such that the transfer-receiving body faces the particle layer on the receiving layer, and to heat the intermediate transfer medium.

A thermal printable medium provides a print substrate and a print color foil. The print substrate has at least one print area. The print color foil covers the print area. The print area is printable by means of heat. The print color foil is fixed to the print substrate outside the print area.

The invention relates to a process for partial colouring, in particular colour laser engraving, of plastic parts, preferably of thermoplastic parts, very particularly preferably of thermoplastic parts comprising a layer construction, comprising the steps of: i) providing a plastic part (A) having at least one surface; ii) laying a colour tape atop at least one portion of the at least one surface of the plastic part (A) to obtain a surface of the plastic part (A) covered with the colour tape; iii) irradiating the plastic part (A) from ii) with focused, preferably nonionizing, electromagnetic radiation (C) on at least one portion of the surface of the plastic part (A) covered with the colour tape, wherein the partial colouring is effected essentially only at the sites on the plastic part (A) irradiated in step iii), wherein the wavelength range of the focused, preferably nonionizing, electromagnetic radiation (C) is in a range from 200 to 20 000 nm, preferably in a range from 300 to 18 000 nm, particularly preferably in a range from 350 to 16 000 nm.

A combination of a thermal transfer sheet and an intermediate transfer medium according to the present disclosure is characterized in that the thermal transfer sheet includes a first substrate and a melt transfer coloring layer, the intermediate transfer medium includes a second substrate and a transfer layer including a receiving layer, and the melt transfer coloring layer and the receiving layer contain a release material.