Measuring method for the online determination of an amount of binder applied to wood particles in a production facility for producing wood-based material boards

Abstract

The present invention relates to a nondestructive measuring method for the online determination of an amount of formaldehyde-free binder applied to wood particles in a production facility for producing wood-based material boards, comprising the following steps: applying in each case different quantitatively defined amounts of at least one formaldehyde-free binder to respective samples of wood particles as reference samples and sprinkling the reference samples onto a conveyor belt; recording at least one NIR spectrum of each of the reference samples sprinkled onto the conveyor belt, using at least one NIR measuring head in a wavelength range of between 1000 nm and 2500 nm, preferably between 1350 nm and 2500 nm; assigning the different quantitative amounts of formaldehyde-free binder of the reference samples sprinkled onto the conveyor belt to the recorded NIR spectra of said reference samples; and creating a calibration model for the relationship between the spectral data of the NIR spectra and the associated quantitative amounts of formaldehyde-free binder of the reference samples sprinkled onto the conveyor belt, by means of a multivariate data analysis; applying at least one formaldehyde-free binder to wood particles (as samples to be measured) and sprinkling the wood particles provided with the formaldehyde-free binder onto a conveyor belt, recording at least one NIR spectrum of the wood particles provided with the formaldehyde-free binder and sprinkled onto the conveyor belt, using the at least one NIR measuring head in a wavelength range of between 1000 and 2500 nm, preferably between 1350 nm and 2500 nm; and determining the quantitative amount of the formaldehyde-free binder applied to the wood particles sprinkled onto the conveyor belt, by comparing the NIR spectrum recorded for the wood particles provided with the binder with the created calibration model.

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