Panels of medium density fibreboard
AssigneeTitan Wood Limited
InventorsBernardus Jozef Maria Pol, Stefan van Dommele, Theorodus Gerardus Marinus Maria Kappen
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Abstract
Disclosed are panels of medium density fibreboard (MDF). The panels comprise wood fibres, the largest dimension of which is 7 mm or below, pressed together with an adhesive. The panels are of a large and thin type, having an aspect ratio of at least 100 and a surface area of at least 1 m2. Typical problems associated with such large and thin panels, e.g. warping behaviour, are addressed by employing wood fibres are made of acetylated wood.
Claims14
A panel of medium density fibreboard (MDF), comprising wood fibres the largest dimension of which is 7 mm or below, pressed together with an adhesive, the panel having an aspect ratio of at least 100 and a surface area of at least 1 m2, wherein the wood fibres are made of acetylated wood.
A panel according to any one of the preceding claims, wherein the fibres have length of from 1 to 5 mm.
A panel according to any one of the preceding claims, wherein the fibres made of acetylated wood are obtainable by a process comprising the steps of (a) providing dried solid wood;
- (b) subjecting the solid wood to acetylation by contact with acetic anhydride;
- (c) chipping the acetylated wood and subjecting the chips to a size reduction so as to obtain fibres the largest dimension of which is 5 mm or below.
A panel according to any one of the preceding claims, wherein the adhesive is selected from the group consisting of selected from the group consisting of phenol-formaldehyde resin, melamine urea-formaldehyde resin, methylene diphenyl diisocyanate (MDI) and polymeric methylene diphenyl diisocyanate (PMDI).
A panel according to any one of the preceding claims, wherein the wood originates from trees in the genera of pinus, eucalyptus, or picea, preferably spruce or radiata pine.
A panel according to any one of the preceding claims, wherein the fibres made of acetylated wood are obtained by a process comprising the steps of (a) chipping solid wood;
- (b) acetylating the chips;
- and (c) refining the acetylated wood chips so as to form acetylated wood fibres.
A panel of medium density fibreboard obtainable by a process comprising the steps of providing wood fibres, adding adhesive and, preferably, wax to the fibres;
- casting the fibres onto a surface, so as to form a mat;
- cold pre-pressing, and hot pressing, wherein the surface on which the fibres are cast, is a moving belt, and wherein the fibres comprise acetylated wood.
The use of acetylated wood fibres in making medium density fibreboard panels, the panels having an aspect ratio of at least 100 and a surface area of at least 1 m2.
The use of acetylated wood fibres in making medium density fibreboard panels, the panels having a length and width of at least 1 m, and an aspect ratio of at least 100, for the purpose of reducing warping of the panel as compared to a similar panel made of non-acetylated wood fibres.
The use of acetylated wood fibres in making medium density fibreboard panels, the panels having a length and width of at least 1 m, and an aspect ratio of at least 100, for the purpose of enabling the penetration of fixation means at a distance selected from the group consisting of less than 25 mm in both directions from a corner of the panel, less than 12 mm from an edge of the panel, and combinations thereof.
Dependencies are inferred from the claim text.