Process for the application of ornamental and decorative motives on the surface of precious, semi-precious and synthetic hard stones as well as in the gold watch and similar industry

摘要

To apply ornamental and decorative motives on the surface of hard stones and similar, the project indicates:1. the copy of the ornamental motive on transparent support2. the preparation of the stone by initial washing, de-greasing and drying3. the sensitisation of the stone by covering with photosensitive paint, spray or immersion, pre-firing to set the "resist" layer, finally cooling at room temperature. Printing the ornament on the stone by exposing it to U.V. rays and protecting by the master: the aforesaid printing, involves a heating phase, a U.V. expositions, then a development of the image and following firing for approximately 15 minutes; since with such process the picture shape is shown - not polymerised "resist" zones; the remaining part, polymerised, is firm on the stone; metallization, consisting in exposing under pressure the stone to vaporized metal; final firing at appropriate temperature to eliminate polymerised and metallised "resist" that still covers part of the stone surface leaving only the wanted part, covered with the metal.