Method for Determining Resin Penetration Into at Least One Porous Coating Material

A method for determining the resin penetration into at least one porous coating material which is pressed with at least one carrier board and at least one resin layer arranged on the carrier board, wherein during the pressing process the resin penetrates or rises into the at least one porous coating material, comprising:

• recording of at least one NIR spectrum of several reference samples each having different values for resin penetration into a porous coating material using at least one NIR measuring head in a wavelength range between 500 nm and 2500 nm, preferably between 700 nm and 2000 nm, more preferably between 900 nm and 1700 nm, and particularly advantageously between 1450 nm and 1550 nm;
• wherein the reference samples are similar to the sample to be measured;
• determining the resin penetration into the porous coating material of the mentioned reference samples by means of a mechanical removal of the porous material surface;
• correlating the resin penetration determined by mechanical removal with the recorded NIR spectra of said reference samples;
• creating a calibration model for the correlation between the spectral data of the NIR spectra and the corresponding resin penetrations of the reference samples by means of multivariate data analysis;
• pressing of at least one porous coating material with at least one carrier board and at least one resin layer arranged on the carrier board,
• recording at least one NIR spectrum of the porous coating material pressed with the carrier board and the resin layer using the at least one NIR measuring head in a wavelength range between 500 nm and 2500 nm, preferably between 700 nm and 2000 nm, in particular preferably between 900 nm and 1700 nm and particularly advantageously between 1450 nm and 1550 nm;
• and
• determining the resin penetration into the at least one porous coating material by comparing the NIR spectrum recorded for the porous coating material with the calibration model created,
• wherein the determination of the resin penetration is carried out without contact in real-time.