Objective criterion for evaluation of the quality decoration in ceramic floor tiles production prior to the sintering process.

Reference	Presenter	Authors (Institution)	Abstract
16-005	Fabio Ferraço	Ferraço, F.(Universidade Federal de Alfenas - Campus Fora de Sede de Poços de Caldas); Rusilo, L.C.(Universidade Federal de Alfenas - Campus Fora de Sede de Poços de Caldas); Boschi, A.O.(Programa de Pós-Graduação Ciência e Engenharia de Materiais/PPGCEM – São Carlos-SP);	In the ceramic tile decoration process, the set of variables that can cause some hue variation in a production or through different batches is quite wide and independent of the methodology used in the production. The understanding of the effects of these variables over the final expected result is of great importance to the producers, especially if the identification of anomalies could be done before the ceramic tile’s sintering stage. The quality of the graphic reproductions in ceramic tiles is basically linked to two major characteristics: the shape of the decorated dot over the tile and the filling of the glazed surface by these dots (number of points transferred by the decoration element). In the aid of the understanding of the variables that affect the hue, this paper proposes the determination of a “Quality Index”, using the methodology of comparison between the theoretical predicted deposition pattern and the actual deposition obtained in analyzed samples, measuring the values of the areas with and without ink; inside and outside the regions projected for the deposition to obtain several parameters, according to the statistical tool of the ROC curve, and a proposition of an objective quality index for tile decoration, prior to the sintering step; standardized that can be performed in automated laboratory analysis systems or in production lines, in the control of the hue variation.
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