Fiber board, a method for making it, and a binder composition
AssigneeNova Scand Utveckling AB
InventorsGeorg Bjorhaag, Goran Embring, Karl-Gunnar Stahl
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Abstract
Fiber boards of high strength which are highly water- and flame-resistant are disclosed, as well as a method for making such boards and an inorganic binder composition for bonding wood fibers. The boards comprise a lignin-containing fiber material, a binder derived from a binder composition comprising an alkali silicate solution, sulphur and/or an inorganic sulphur compound, and a calcium and/or magnesium compound and, optionally, fillers and/or hydrophobing agents. The fiber boards are manufactured by mixing the lignin-containing fiber material with the binder composition and optional further additives, whereupon the mix is compressed at a high pressure and at a temperature of 130.degree.-230.degree. C.
Claims12
A binder composition for use in bonding wood fibers, said composition consisting essentially of:
- (a) 50-90 parts by weight of an alkali silicate solution;
- (b) 0.5-10 parts by weight of a sulphur component;
- and
- (c) 10-40 parts by weight of a metal component selected from the group consisting of calcium compounds, magnesium compounds and mixtures thereof.
Dependencies are inferred from the claim text.