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Hue Variation on Ceramic Tile During the Decoration Stage by Laser Engraved Silicon Cylinders Method

Hue variation is a common problem in the ceramic tile industry. Despite the growth of the digital decoration in recent years, a considerable part of the ceramic tiles is still decorated by the more traditional technique using laser engraved silicone cylinders. In this scenario, the objective of the present study was to contribute to minimize the hue variation of ceramic tiles. To achieve this, the correlation between the viscosity of the ink and the geometric characteristics of the printed dots was studied. Some of the variables related to the decoration process were fixed. The viscosity of the ink was varied and the geometric characteristics of the dots were evaluated. In general the values measured for the reflectance, decrease with the increase of the viscosity, but there are cases where this variation shows an opposite behavior. As a conclusion, for each range of gray-scale values there is a range in viscosity that optimizes the ink transfer to the ceramic tile.