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Glaze & engobe application

GLAZE & ENGOBE APPLICATION

Drying time

Powdering or low adhesion

Ridges

Drying time

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 ink definition due to expansion of the ink dots on a wet surface.

The quantity and type of plastic mineral in the glaze or engobe is therefore important.

To increase drying time of engobes:

  • UK: Hymod HSM-E, Hyplas 64
  • US: Old mine #4
  • France: FMT

To reduce drying time of engobes:

  • Thailand: Whiteplas N11
  • UK: Hywite premium
  • Egypt: ICE Hywite Premium
  • India: Certiwhite

To increase drying time of glaze:

  • UK: Grolleg

To reduce drying time of glaze:

  • UK: Kaoshine CNL 80
  • US: Allen G
  • Brazil: Kaoshine RC70

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.

Glaze kaolin

  • UK: Grolleg
  • France: Kaolinor 1C, Kerbrient

Ridges

During bell application, the glaze curtain may be trembly or wavy which leads to ridges on the tile surface. This is usually due to low viscosity of the glaze. A controlled glaze viscosity of around 40-50s (Ford cup 4mm ) is usually a good compromise depending on the slip density.

This can be easily obtained with the following products:

Glaze kaolin

  • France: Kaolinor 1C, Kerbrient
  • UK: Kaoshine GL2

Still having issues with glaze & engobe application? Have a question you need to ask us?

Please contact us. We will be only too happy to help.

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