Method and device for determining fibre porosity in a fibre suspension, and control system

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United States of America Patent

PATENT NO 12123842
SERIAL NO

17950863

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Abstract

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Disclosed is a method for determining fibre porosity in a fibre suspension. A sample is taken from a fibre suspension and fibre porosity determination is performed by determining the ratio of fibre-internal water to fibre-external bound water as an online measurement using a NMR spectroscope in successive steps of: generating a magnetic field for exciting protons of water contained in the sample; exciting water molecules of fibre suspension contained in the sample with a frequency pulse provided by a coil; measuring a return signal of the frequency pulse that returns from water molecules to the coil; determining the proton relaxation time and the amplitude of the return signal from the return signal; and determining fibre porosity of the fibre suspension based on the amplitude and the relaxation time of the exponential return signal. Also disclosed is a device for determining fibre porosity of a fibre suspension and a control system connected to a fibre web machine.

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Patent Owner(s)

Patent OwnerAddress
KAAKKOIS-SUOMEN AMMATTIKORKEAKOULU OY50100 MIKKELI

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hiltunen, Yrjö Savonlinna, FI 3 0
Käyhkö, Jari Savonlinna, FI 1 0
Nikolskaya, Ekaterina Savonlinna, FI 3 0

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