Cold embossing for visually disabled people, comprises glass or crystal material with smooth surface, etching the material to have conical/tapered cavity, treating the surface to develop asperities, depositing propylene diamine and drying

摘要

Etching the material (3) to create cavity (4) and treating the surface of the walls of the cavity by abrasion using a tungsten rotary tool (5) in tapered form comprising diamond spangles on its external walls (6). Depositing the pasty material (7) at the cavity using a calibrated point (8) by dropwise to form a protrusion of 1 mm from the surface of the material. The positioning of the points forming a Braille character.