Metso Automation Oy

Metso Paper Automation Oy

Markku K&auml;ns&auml;koski

Jussi Tenhunen

Markku M&auml;ntyl&auml;

Timo Hyv&auml;rinen

The invention relates to a method and an apparatus for measuring a coating from paper or board. The measurement is carried out by one detector at different times or by two detectors simultaneously. IR radiation directed at the coating and radiation emerging from the coating are chopped synchronously in blocks. A wavelength band sensitive and insensitive to the absorption are bandpass filtered and measured in both the MIR and NIR region. The absorption strength is measured in a digital signal processing block by comparing the radiation sensitive to absorption to the radiation insensitive to absorption, and the amount of each coating component is determined in the digital signal processing block on the basis of the absorption strength.

Method and apparatus for measuring coating

The invention relates to a method and an apparatus for measuring the properties of paper from a moving paper web in a paper machine. An infrared beam is directed to the paper web. The infrared beam, passed through or reflected from the paper web, is split into wavelength components with a spectrograph, and signals of the different wavelength components are measured, and the properties of paper are determined on the basis of the signals.

Growing community of inventors

Oulu, Finland

Markku Känsäkoski

Growing community of inventors

Oulu, Finland

Markku K&auml;ns&auml;koski

Markku Känsäkoski