In-line coated wood-based boards

Patent metadata

Field	Value
Publication number	US-10618196-B2
Application number	US-201715778823-A
Country	US
Kind code	B2
Filing date	Jan 2, 2017
Priority date	Jan 8, 2016
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

The present invention relates to a process for manufacturing a wood-based board, a wood-based board as use of a liquid coating composition comprising at least one particulate filler material and at least one binder for in-line coating of wood-based boards.

First claim

The invention claimed is:

1. A wood-based board comprising
a) a base of wood particles and/or fibres, and
b) a coating on the first and/or reverse side of the wood-based board, wherein the coating comprises
i) at least one particulate filler material, having a ratio of particle size d 80 to particle size d 20 [d 80 /d 20 ] from 0.5 to 1.0, and
ii) at least one binder.

2. The wood-based board according to claim 1 , wherein the coating is penetrated into the surface of the wood-based board.

3. The wood-based board according to claim 1 , wherein the at least one particulate filler material has
i) a particle size d 98 of <500 μm,
ii) a particle size d 80 of 0.1 to 250 μm,
iii) a median particle size d 50 of 0.1 to 150 μm, and
iv) a particle size d 20 of 0.1 to 50 μm.

4. The wood-based board according to claim 1 , wherein the surface of the coated side of the wood-based board has
i) a brightness from 50 to 100%, according ISO R457 (Tappi452) and DIN 6167,
ii) a yellowness from 2 to 70%, according ISO R457 (Tappi452) and DIN 6167,
iii) L* from 50 to 100, according to DIN EN ISO 11664-4:2012,
iv) a* from −5 to 10, according to DIN EN ISO 11664-4:2012, and
v) b* from 0 to 30, according to DIN EN ISO 11664-4:2012.

5. The wood-based board according to claim 1 , wherein the surface of the coated side of the wood-based board has
i) a maximum roughness amplitude Sz from 20 to 800 μm,
ii) an arithmetic mean roughness Sa from 2 to 80 μm, and
iii) a root mean square roughness Sq from 2 to 20 μm.

6. The wood-based board according to claim 1 , wherein the at least one particulate filler material has
i) a particle size d 98 of <500 μm,
ii) a particle size d 80 of 0.1 to 250 μm,
iii) a median particle size d 50 of 0.1 to 150 μm, and
iv) a particle size d 20 of 0.1 to 50 μm,

and the surface of the coated side of the wood-based board has
i) a brightness from 50 to 100%, according ISO R457 (Tappi452) and DIN 6167,
ii) a yellowness from 2 to 70%, according ISO R457 (Tappi452) and DIN 6167,
iii) L* from 50 to 100, according to DIN EN ISO 11664-4:2012,
iv) a* from −5 to 10, according to DIN EN ISO 11664-4:2012, and
v) b* from 0 to 30, according to DIN EN ISO 11664-4:2012, and
i) a maximum roughness amplitude Sz from 20 to 800 μm,
ii) an arithmetic mean roughness Sa from 2 to 80 μm, and
iii) a root mean square roughness Sq from 2 to 20 μm.

7. The wood-based board according to claim 1 , wherein the wood-based board further comprises a printing on the first and/or reverse side of the wood-based board on the coating of the wood-based board.

8. The wood-based board according to claim 1 , wherein the wood-based board is a fibre board product comprising a high-density fibre (HDF) board, medium-density fibre (MDF) board, low-density fibre (LDF) board, a particle board, an oriented strandboard (OSB), a hardboard or an insulation board.

9. The wood-based board according to claim 1 , wherein the wood-based board has a bending strength of >5 N/mm 2 .

10. The wood-based board according to claim 1 , wherein the wood-based board has a bending strength of 10 to 50 N/mm 2 .

11. The wood-based board according to claim 1 , wherein the wood-based board has a bending strength of 15 to 45 N/mm 2 .

12. The wood-based board according to claim 1 , wherein the wood-based board has a modulus of elasticity of >500 N/mm 2 .

13. The wood-based board according to claim 1 , wherein the wood-based board has a modulus of elasticity from 1 000 to 4 500 N/mm 2 .

14. The wood-based board according to claim 1 , wherein the wood-based board has a modulus of elasticity from 1 500 to 3 500 N/mm 2 .

15. The wood-based board according to claim 1 , wherein the wood-based board has an internal bond strength of >0.10 N/mm 2 .

16. The wood-based board according to claim 1 , wherein the wood-based board has an internal bond strength of 0.2 to 1.4 N/mm 2 .

17. The wood-based board according to claim 1 , wherein the wood-based board has an internal bond strength of 0.4 to 1.2 N/mm 2 .

18. The wood-based board according to claim 1 , wherein the wood-based board has a thickness swelling after 24 h water storage of <20%.

19. The wood-based board according to claim 1 , wherein the wood-based board has a thickness swelling after 24 h water storage from 2.0 to 15.0%.

20. The wood-based board according to claim 1 , wherein the wood-based board has a thickness swelling after 24 h water storage from 4.0 to 10%.

21. The wood-based board according to claim 1 , wherein the wood-based board has a brightness of at least 50%.

22. The wood-based board according to claim 1 , wherein the wood-based board has a brightness of at least 65%.

23. The wood-based board according to claim 1 , wherein the wood-based board has a brightness of at least 75%.

24. The wood-based board according to claim 1 , wherein the wood-based board has a brightness of at least 80%.

Assignees

• Omya Int Ag

Inventors

• Schrul Christopher
• Hunziker Philipp

Classifications

• C09D201/00

  Coating compositions based on unspecified macromolecular compounds · CPC title

• C09D7/61

  inorganic · CPC title

• C04B2111/00482

  Coating or impregnation materials · CPC title

• C04B26/16

  Polyurethanes · CPC title

• C04B26/12

  Condensation polymers of aldehydes or ketones · CPC title