The material entering a strip process line usually comes from cold or hot rolling. In these lines, accurate flatness measurement is difficult due to high temperatures or high tension and temperature variations. Strip shape is also affected by cooling and stretching effects in coils as well as the coiling process itself. The shape at the entry side of a strip process line is therefore often unknown or differs from the measurement in up-stream process steps.
Bad incoming shape can result in damages to the strip or equipment in the lines, which can often be avoided if the shape is known, a priori, but a good incoming shape is always to prefer.
By measuring incoming shape, there are two benefits:
- The “true” shape can be used to fine-tune rolling for a better target shape profile, so the flatness is improved over time when the knowledge increases.
- Strip speed, guiding and leveling can be adjusted depending on the incoming shape to produce better material and avoid damages to furnaces etc.
Shapeline has a product that is very well suited for this, the VeriFlat. A VeriFlat can be used for a fixed installation, but also to do tests and adjustments. Once the tests are finished, the sensor can be moved to the next line.