Ceramic tile surface analysis and shade control
As the tile passes under a line-scan camera on the roller line its surface is scanned line by line. The image is searched for cracks, pinholes and glaze faults; the measured colour is compared with the reference and a shade class is assigned. A defective tile is transferred to the side stack.
Defect count, colour difference and shade class appear on the display; the pusher transfers an NG tile to the side stack and the tower signals the surface decision.
- 01 Infeed
- 02 Scan
- 03 Surface
- 04 Shade
- 05 Sort
Tiles approach the scanning station at constant speed on the roller line.
- Defects
- —
- Shade class
- —
- Colour diff.
- —
Scenes are illustrative simulations; they are not customer references or performance guarantees.
Need
Glaze reflections can hide cracks, while natural texture can resemble small pinholes. Tile motion requires scan lines and colour samples to remain registered to the same surface.
Solution approach
A line-scan camera assembles the moving surface from lines; a low-angle bar light emphasises small surface breaks. A photo-sensor indicates tile presence. Defects are marked in the image and colour is compared with a shade scale; surface and shade jointly determine stacking.
Process steps
- 01
Infeed
Tiles approach the scanning station at constant speed on the roller line.
- 02
Scan
The line-scan camera images the surface line by line under the bar light.
- 03
Surface
The image is searched for cracks, pinholes and glaze faults.
- 04
Shade
The mean colour is compared with the reference and a shade class is assigned.
- 05
Sort
Surface result and shade class together decide the stacking lane.
Related applications
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