Inkless printing apparatus
A marking device and substrate technology, applied in printing and other directions, can solve problems such as limiting efficiency and commercial profit, and achieve the effect of improving efficiency
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[0037] now turn figure 1 , shows a substrate marking device 100 . The apparatus 100 is suitable for marking a substrate 101 comprising a material which is liable to change color under irradiation, in order to form an image.
[0038] The substrate 101 includes a base layer on which a layer of diacetylene material is provided. The layer of diacetylene material may also incorporate an IR / NIR absorbing material, or may be provided on a layer of IR / NIR absorbing material. Those skilled in the art will of course appreciate that substrates doped with other materials that tend to change color under irradiation may also be used.
[0039] Diacetylenes are particularly suitable for use with devices according to the invention, examples of diacetylenes in the prior art are disclosed in WO2006018640, WO2009093028 and US6524000. Particularly preferred are those which can be activated reversibly between an inactive and active form by radiation as a stimulus, or which can be irreversibly ac...
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