Two to five sequential steps are required to create the pattern found on décor paper. After each colour application, the only 70 µm (0.07 mm) thick paper must dry before the next colour layer can be applied. As the paper dries out, small variations to the width of the paper web take place. The FiberVision measurement system controls the residual stress properties of the paper as well as the actual width after the paper has dried.

This leads to reduced setup times and, especially for complex patterns, to a substantial improvement in process security. Beneficial savings on raw materials and production time, as well as a reduction in customer complaints, can be obtained. The FiberVision measurement system is constructed robustly. Even with dished paper, or smooth or contaminated feed rolls, the measurement system operates efficiently and reliably. An integrated cooling system can protect the sensors against extreme operating temperatures of up to 150°C. For adjustment to the different paper widths, the sensors are shifted to the position of each new trailing edge with the aid of an alignment laser. The sensors can determine their own absolute position with 1/100 mm accuracy. Therefore, no –apart from a one-off calibration during installation- further calibration is necessary. The FiberVision measurement system is powered with 24V and communicates with the host computer over the TCP/IP network. For the transfer of regulation parameters to the measurement system, either the network or a Profibus can be used.

System features:

• 0,1 mm Width measurement accuracy of décor paper
• Measurements possible in difficult conditions (i.e. dished paper, contaminated or reflecting feed rolls)
• Only one initial calibration of the system is necessary
• Network capabilities over TCP/IP or Profibus
• Host computer features a graphical user interface for the visualisation of results
• Protected against contamination and extreme temperatures.