PROCESS AND DEVICE FOR DETERMINING THE MECHANICAL PROPERTIES OF PAPER

摘要

Conclusions about the mechanical properties of paper (10) may in particular be derived from measurements of the connections between the paper fibres. According to the invention, the connections between the paper fibres are measured by infrared spectroscopy. The presence of mutually linked hydroxyl and/or carboxyl groups at the surface of the fibres is optically sensed and evaluated as a measurement for the mechanical properties of the paper. In the corresponding device, at least one evaluation unit (11-16) is available, in particular for correcting the base lines of the spectra, and then for determining the mechanical properties of the paper based on the bands of the spectrum, in particular the presence of connections between the fibres.