阅读说明：本技术 木板及其生产方法 (Wood board and production method thereof ) 是由 R·汉德 R·杰克逊 于 2013-08-17 设计创作，主要内容包括：本发明涉及木板,特别地后固化的木板和更特别地涉及具有优良溶胀性能的刨花板；本发明还涉及生产这种板的方法。(The present invention relates to wood boards, in particular post-cured wood boards and more particularly to particle boards having excellent swelling properties; the invention also relates to a method for producing such a panel.)

1. A method of manufacturing a wood board, the method comprising the steps of:

(a) providing a wood block;

(b) applying a carbohydrate binder composition to the wood pieces provided in step (a);

(c) forming the wood block obtained in step (b) into a sheet;

(d) heating and pressing the sheet obtained in step (c) to obtain a cured wood board; and

(e) post-curing the wood board obtained in step (d).

2. A process according to claim 1 for the manufacture of particle board, comprising the steps of:

(a) providing wood pellets;

(b) mixing the wood pellets provided in step (a) with a carbohydrate binder composition;

(c) forming the mixture obtained in step (b) into a sheet;

(d) heating and pressing the sheet obtained in step (c) to obtain a cured particle board; and

(e) post-curing the particle board obtained in step (d).

3. The process of claim 1 or claim 2, wherein the post-curing of step (e) is carried out at a temperature in the range of 75 ℃ to 280 ℃.

4. The method of claim 1 or claim 2, wherein the post-curing step (e) is performed using Radio Frequency (RF) waves.

5. The process of claim 1 or claim 2, wherein the post-curing step (e) is performed using a hot press, a conventional oven, hot steam and/or microwaves.

6. The method of claim 1 or claim 2, wherein the heating to effect post-curing of step (e) is for a time of from 10 seconds to 30 hours.

7. The method of claim 1 or claim 2, wherein the carbohydrate binder composition is selected from the group consisting of:

-a carbohydrate binder composition comprising at least 50% dry weight of carbohydrates;

-a carbohydrate binder composition comprising 50-90 wt% of the total carbohydrate component and 10-50 wt% of the total amine component, based on the total content of carbohydrate and amine components;

-a carbohydrate binder composition comprising the reaction product of at least one carbohydrate component and at least one amine component;

-the total amount of reaction product comprising at least one carbohydrate component and at least one amine component, unreacted carbohydrate component and unreacted amine component is at least 60 wt% of the carbohydrate binder composition based on the total weight of the carbohydrate binder composition.

8. The method of claim 1 or claim 2, wherein the carbohydrate binder composition is selected from the group consisting of:

-a carbohydrate binder composition comprising at least 50% by dry weight of reducing sugars;

-a carbohydrate binder composition comprising 50-90 wt% of the total reducing sugar component and 10-50 wt% of the total amine component, based on the total content of reducing sugar and amine components;

-a carbohydrate binder composition comprising the reaction product of at least one reducing sugar component and at least one amine component;

-the total amount of reaction product comprising at least one reducing sugar component and at least one amine component, unreacted reducing sugar component and unreacted amine component is at least 60 wt% of the carbohydrate binder composition based on the total weight of the carbohydrate binder composition.

9. The method of claim 1 or 2, wherein the carbohydrate binder composition comprises the reaction product of at least one reducing sugar component and at least one amine component.

10. The method of claim 1 or 2, wherein the carbohydrate binder composition comprises at least 50% by dry weight of reducing sugars.

11. The method of claim 7, wherein the at least one carbohydrate component is selected from the group consisting of ribose, arabinose, xylose, lyxose, glucose (dextrose), mannose, galactose, allose, altrose, talose, gulose, idose, fructose, psicose, sorbose, dihydroxyacetone, sucrose, and tagatose, and mixtures thereof, and

the at least one amine component is selected from ammonium sulfate (AmSO)₄) Ammonium chloride, ammonium nitrate, 1, 2-diaminoethane, 1, 4-diaminobutane, 1, 5-diaminopentane, 1, 6-diaminohexane, 1, 12-diaminododecane,1, 4-diaminocyclohexane, 1, 4-diaminobenzene, diethylene triamine, triethylene tetramine, tetraethylene pentamine, 1-piperazineethylamine, 2-methyl-pentamethylene diamine, 1, 3-pentanediamine and bis (hexamethylene) triamine, 1, 8-diaminooctane and mixtures thereof.

12. The method of claim 1 or claim 2 wherein the carbohydrate binder composition comprises from 50 to 90 wt% of the total reducing sugar component and from 10 to 50 wt% of the total amine component, based on the total content of reducing sugar and amine components.

13. The method of claim 12 wherein the carbohydrate binder composition comprises 25 to 50 wt.% DMH,25 to 50 wt.% fructose, and 10 to 50 wt.% HMDA, based on the total content of carbohydrate and amine components.

14. The method of claim 1 or claim 2, wherein the carbohydrate binder composition comprises the reaction product of at least one reducing sugar component and at least one amine component, the total amount of unreacted reducing sugar component and unreacted amine component being at least 60 wt% based on the total weight of the carbohydrate binder composition.

15. The process according to claim 1 or claim 2, wherein in step (d), the sheet obtained in step (c) is heated with a temperature set in the range of 140 ℃ to 270 ℃ to obtain a cured wood board.

16. The process according to claim 1 or claim 2, wherein in step (d) the sheet obtained in step (c) is pressed at a pressure in the range of 20-80bar to obtain a cured wood board.

17. The process according to claim 1 or claim 2, wherein in step (d) the sheet obtained in step (c) is pressed at a pressing factor in the range of 2s/mm to 60s/mm to obtain a cured wood board.

18. A method according to claim 1 or claim 2, wherein the method comprises the steps of arranging a plurality of cured wood boards obtained from step (d) to form a stack of wood boards, and subjecting the stack of wood boards to post-curing step (e).

19. The method according to claim 1 or claim 2, wherein during the post-curing step (e) of the wood board, the internal temperature of the wood board, in particular the temperature at the centre of the wood board in its thickness direction, is raised from the last temperature of step (d) of heating and pressing the board to a temperature of at least 110 ℃, which last temperature of step (d) is at least 5 ℃, in particular at least 10 ℃ lower than the temperature achieved during the post-curing step.

20. A wood board, in particular a particle board, obtained or obtainable by the process of claim 1 or claim 2.

21. Wood board or particle board according to claim 20, wherein the swelling in the thickness direction of the board, determined according to EN317:1993, is less than or equal to 70% for an impregnation time of 24 hours.

22. Use of a post-cured wood board in a process according to claim 1 or claim 2 to reduce swelling in the thickness direction of the wood board.

EXAMPLE 1 production of particle Board (300 mm. times.300 mm. times.10 mm)

By adding HMDA (10.53g) to a mixture of 32.44g dextrose monohydrate (DMH; 90.9 wt% in H₂O), 29.59g fructose (FRU; 100% solids), 10.53g hexamethylenediamine (HMDA; 70 wt% in H₂O) and 22.32g of water, a carbohydrate binder composition was prepared. This carbohydrate binder composition corresponds to 40:40:20 wt% DMH: FRU: HMDA.

The adhesive composition (105.3 g; 70 wt% in H)₂O medium) and wood chips (526.5g) and made to have a weight of 650kg/m³To a desired final density. At 195 ℃ and a pressure of 56bar (504kN force), using a heated press (Fontijne L)ab eco 600) to press this sheet. The extrusion factor was 14s/mm, which corresponds to a total extrusion time of 140 seconds.

Subsequently, similar results were achieved at an extrusion factor of about 10s/mm and less.