Method for determining the moisture content of a resin layer on a carrier board

1. A method for determining the moisture content of at least one resin layer provided on at least one wooden board as carrier board, wherein between the at least one resin layer and the carrier board an NIR reflecting layer is provided, the method comprising:

recording of at least one NIR spectrum of the at least one resin layer provided on the at least one carrier board using a NIR detector in a wavelength range between 500 nm and 2500 nm; and

determining the moisture content of the resin layer by comparing the NIR spectrum recorded for the resin layer to be measured with at least one NIR spectrum recorded for at least one reference sample with known moisture content by means of a multivariate data analysis (MDA);

wherein the at least one NIR spectrum recorded for the at least one reference sample with known moisture content was determined previously using the same NIR detector in a wavelength range between 500 nm and 2500 nm;

wherein the method is conducted in a production line of the at least one wooden board, comprising: at least one application device, at least one drying device, at least one NIR detector, and

wherein the at least one NIR detector is arranged after the applying device and the drying device; and

wherein the moisture content of the at least one resin layer is adjusted in the production line based on the determined moisture content of the resin layer.

2. The method according to claim 1 , wherein the at least one wooden board is at least one of the following: a medium density fiber (MDF), a high density fiber (HDF), an oriented strand (OSB) board, a plywood panel, a cement fiber board, a gypsum fiber board, a wood-plastic-board or any combination thereof.

3. The method according to claim 1 , wherein the reference sample with known moisture content comprises at least one, resin layer applied to a carrier board, wherein the resin layer and the carrier board of the reference sample are of the same kind of the sample of resin layer and carrier board to be measured.

4. The method according to claim 3 , wherein the resin layer is pre-dried.

5. The method according to claim 1 , wherein the resin layer to be measured comprises at least one of the following: a formaldehyde containing resin, a melamine formaldehyde resin, a urea formaldehyde resin or mixtures thereof, a polyurethane, an acrylate or any combination thereof.

6. The method according to claim 1 , wherein the resin layer to be measured comprises at least one of the following: wear resistant particles, natural fibers, synthetic fibers, further additives or any combination thereof.

7. The method according to claim 1 , wherein the resin layer to be measured comprises a plurality of layers.

8. The method according to claim 7 , wherein the resin layer to be measured comprises three layers, wherein in one of the three layers of the resin layer wear resistant particles are present, in a second of the three layers natural and/or synthetic fibers are present and in a third of the three layers again wear resistant particles are present.

9. The method according to claim 1 , wherein the determination of the moisture content of the resin layer is carried out after applying the resin layer to the carrier board and a drying step in a drying segment using the at least one NIR detector.

10. The method according to claim 1 , wherein the determination of the moisture content of the resin layer takes place after applying and drying at least one resin layer, respectively.

11. The method according to claim 1 , wherein the at least one NIR reflecting layer comprises a layer construction of a plurality of NIR reflecting layers.

12. The method according to claim 11 , wherein the at least one NIR reflecting layer comprises a layer construction of at least one of the following: two NIR reflecting layers, three NIR reflecting layers, and four NIR reflecting layers.

13. The method according to claim 1 , wherein the at least one NIR reflecting layer comprises at least one of the following: at least one first resin layer, at least one white priming layer, at least one decor layer printed onto the wooden board, at least one protective layer or any combination thereof.

14. The method according to claim 13 , wherein the at least one decor layer printed on the wooden board is a water-based pigmented printing color, which is applied in gravure printing or digital printing.

15. The method according to claim 14 , wherein at least one protective layer of a resin is provided on the at least one decor layer printed on the wooden board.

16. The method according to claim 13 , wherein at least one protective layer of a resin is provided on the at least one decor layer printed on the wooden board.

17. The method according to claim 1 , wherein the resin layer to be measured is arranged on the upper side and/or lower side of the carrier board.

18. A device for determining the moisture content of at least one resin layer arranged on a wooden board as carrier board according to the method according to claim 1 , wherein the device comprises at least one application device, at least one drying device and at least one NIR detector, wherein the at least one NIR detector is arranged in a processing direction after the applying device and the drying device.

19. The method according to claim 1 , wherein the wavelength range is between 700 nm and 2000 nm.

20. The method according to claim 1 , wherein the wavelength range is between 900 nm and 1700 nm.