Local variations in moisture that occurr during the production processes of paper and board can cause problems in the final product, such as cockling and waviness. With the new high-speed infrared camera at Innventia, it is possible to find out what is causing the variations in moisture, for example, by measuring the drying behaviour in actual running processes, such as paper production, gluing of corrugated board, coating and printing.

 

An infrared (IR) camera shows information that the eye does not percieve and clearly illustrates the variations in temperature in the different areas of an image. This is of great interest, especially for the drying process, since moist areas in a picture clearly stand out as some degrees cooler. In such a way, the reasons for the variations in moisture during paper production can be examined on-line on the paper web. Variations in temperatures can be recorded at high speed when the process conditions are varied, which provides valuable insights for troubleshooting of unit operations, modelling and research.

 

An infrared camera clearly illustrates the variations in temperature in different sections of an image.