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The drying time of glaze and engobe must be adjusted to obtain a mat surface just before the following application.
If the drying of engobe or glaze is too quick before the next application, the glaze will be absorbed too fast leading possibly to holes in the layer and a gradient of particles size and composition across the layer itself.
If the glaze dries too slowly, at the decoration step it can lead to a loss of definition of the inks due to expansion of the ink dots on a wet surface.
The quantity and type of plastic mineral in the glaze or engobe is thus important :
To increase drying time of engobes
To reduce drying time of engobes
To increase drying time of glaze
- UK: Grolleg
To reduce drying time of glaze
Powdering or low adhesion
When the glaze layer is not cohesive enough, after drying the layer can either transform into powder on the surface which will stick to the printing rollers, or create defects. To reduce powdering, the following kaolins can be used to bring more cohesion to the glaze layer.
During application by bell , the glaze curtain is trembling or wavy, which leads to ridges on the tile surface. This is usually due to low viscosity of the glaze. A controlled glaze viscosity around 40-50 s (Ford cup 4 mm ) is usually a good compromise depending on the slip density.
This can be easily obtained with the following products: