Method for finishing a wood-based board

Patent metadata

Field	Value
Publication number	US-11059071-B2
Application number	US-201515302818-A
Country	US
Kind code	B2
Filing date	Jun 17, 2015
Priority date	Jun 24, 2014
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

The disclosure relates to a method for finishing a wood-based board with an upper face and a lower face, having the following steps: a) applying a undercoat made of a liquid melamine resin onto the upper face, the melamine resin at least partly penetrating into the upper edge layer of the wood board, b) drying the undercoat into an undercoat layer, c) applying a base color onto the undercoat layer, d) drying the base color into a base color layer, e) applying a base color onto the base color layer in order to produce a decorative element, f) drying the decorative element into a decorative layer, g) applying a liquid melamine resin onto the dried decorative layer, h) drying the melamine resin into a melamine resin layer, and i) applying a liquid medium with a proportion of isocyanate.

First claim

What is claimed is:

1. A process for the finishing of a wood-based board with an upper side and an underside, comprising:
a) application of a basecoat made of a first liquid melamine resin to the upper side, where the melamine resin penetrates at least to some extent into an upper peripheral layer of the wood-based board,
b) drying of the basecoat to give a basecoat layer,
c) application of a base color to the basecoat layer,
d) drying of the base color to give a base color layer,
e) application of a printing ink to the base color layer to produce a decorative effect,
f) drying of the decorative effect to give a decorative layer,
g) application of a second liquid melamine resin to the dried decorative layer,
h) drying of the second liquid melamine resin to give a melamine resin layer, and
i) application of a liquid medium having a proportion of isocyanate groups to the second liquid melamine resin layer,
wherein the liquid medium is a molten hotmelt which solidifies after application to give a layer, the hotmelt is an adhesive which has isocyanate groups, the hotmelt is heated prior to application and then cooled after the application to form a layer on the melamine resin layer.

2. The process as claimed in claim 1 , wherein a third liquid melamine resin is applied to the underside, and is dried to give a counterbalancing material.

3. The process as claimed in claim 2 , wherein the liquid medium has a proportion of isocyanate groups applied to the counterbalancing material.

4. The process as claimed in claim 1 , wherein at least one protective covering layer is applied to a dried layer of the liquid medium.

5. The process as claimed in claim 4 , wherein the protective covering layer comprises nanoparticles in order to improve resistance to microscratching.

6. The process as claimed in claim 1 , wherein the liquid medium comprises wear-inhibiting particles.

7. The process as claimed in claim 6 , wherein the wear-inhibiting particles are corundum particles.

8. The process as claimed in claim 1 , wherein at least one of the liquid medium, the melamine resin layer(s), and protective covering layer comprise(s) at least one of glass beads and agents having antistatic and/or antibacterial effect.

9. The process as claimed in claim 8 , wherein the diameter of the glass beads is less than 30 μm.

10. The process as claimed in claim 8 , wherein the diameter of the glass beads is from 30 to 120 μm.

11. The process as claimed in claim 1 , wherein the liquid medium is applied in a plurality of individual layers.

12. The process as claimed in claim 1 , wherein the quantity applied of the liquid medium is from 50 to 200 g/m 2 .

13. The process as claimed in claim 1 , wherein a layered structure comprising the features of a) to i) is pressed.

14. The process as claimed in claim 13 , wherein during the pressing of the layer structure a structure is embossed into the layers applied on the upper side.

15. The process as claimed in claim 14 , wherein the structure is formed synchronously with respect to the decorative effect.

16. The process as claimed in claim 1 , wherein a short-cycle press is used for a pressing process.

17. The process as claimed in claim 1 , wherein at least one structured roll is used for a pressing process.

18. The process as claimed in claim 1 , wherein the decorative effect is a decorative wood effect, decorative stone effect, decorative tile effect, or imaginative decorative effect.

19. The process as claimed in claim 1 , wherein the isocyanate groups in the hotmelt react with at least one of a methylol group of the melamine resin to give a polyurethane and with an NH group to give a urea derivative.

20. The process as claimed in claim 1 , wherein the isocyanate groups in the hotmelt react with water to give amine and further reaction with free isocyanate groups to give urea derivatives.

21. A process for the finishing of a wood-based board, comprising:
a) application of a basecoat made of a first liquid melamine resin to an upper side of the wood-based board,
b) drying the basecoat to give a basecoat layer,
c) application of a base color to the basecoat layer,
d) drying the base color to give a base color layer,
e) application of at least one printing ink to the base color layer to produce a decorative effect,
f) drying the at least one printing ink to give a decorative layer,
g) application of a second liquid melamine resin to the decorative layer,
h) drying the second liquid melamine resin to give a melamine resin layer,
i) pressing the wood-based board with the basecoat, the base color, the at least one printing ink and the second liquid melamine resin under pressure and heat,
j) heating a liquid medium to a molten hotmelt prior to application, the liquid medium having a proportion of isocyanate groups to the melamine resin layer,
k) application of the molten hotmelt to the wood-based board, and
j) cooling the liquid medium with the proportion of isocyanate groups to give a finished layer.

22. The process as claimed in claim 21 , wherein the molten hotmelt has 100% solids content, which solidifies on cooling after the application.

Assignees

• Flooring Technologies Ltd

Inventors

• Oldorff Frank

Classifications

• E04F15/20 Primary

  for sound insulation · CPC title

• B44C5/04 Primary

  Ornamental plaques, e.g. decorative panels, decorative veneers · CPC title

• B05D5/06 Primary

  to obtain multicolour or other optical effects (B05D5/02 takes precedence) · CPC title

• B05D7/08

  using synthetic lacquers or varnishes · CPC title

• B05D1/265

  Extrusion coatings · CPC title