| 摘要 |
Manufacture of tablets from a powder mixture, using a tablet press with a die (3) and two punches (1a,1b) involves compressing the powder mixture to a tablet under pressure, using a die and two punches and reproducing the diffractive micro-structure on at least a part of the surface of the tablet. Manufacture of tablets with an optical security feature from a powder mixture, using a tablet press with a die and two punches involves compressing the powder mixture to a tablet under pressure, using a die and two punches and reproducing the diffractive micro-structure on at least a part of the surface of the tablet. The diffractive micro-structure is reproduced on the surface of the particles of the powder mixture. The surface of the die and/or one or both punches facing the powder mixture is provided with an embossing relief in the form of a diffractive micro-structure, which produces recognizable diffraction effects in the optical spectral range.
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