Bonding of solid lignocellulosic material
AssigneesJohn Stofko, John Jansky
InventorJohn Stofko
Life of this patent
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Abstract
Solid lignocellulosic material is bonded together by heating and pressing with a bonding composition comprising at least one carbohydrate and an acid capable of catalysing hydrolysis of the carbohydrate, for example to make plywood or particle board.
Claims21
A method of providing a waterproof bond between solid lignocellulose materials, comprising:
- applying to the surface of said solid lignocellulose material an amount sufficient to effect bonding comprising in the range of from 2 to 32 grams of carbohydrate per 1,000 cm.sup.2 of area of material of a bonding composition comprising a non-cellulosic carbohydrate and an acid catalyst capable of catalyzing transformation of the carbohydrate, the amount of acid catalyst being from 1 to 20% by weight of the carbohydrate;
- and
- pressing said solid lignocellulose materials together at about 140.degree.-200.degree. C at a pressure in the range of about 5-25 kg/cm.sup.2 for about 0.32 to 2 minutes per mm of thickness of said solid lignocellulose materials to transform said carbohydrate into furan type compounds and form said waterproof bond.
A method of bonding solid lignocellulosic materials producing a waterproof bond, which comprises
- applying to the surface of the material a bonding composition consisting essentially of a non-cellulosic carbohydrate and an acid catalyst capable of catalyzing transformation of the carbohydrate, said carbohydrate being present in an amount sufficient to coat the surface of said material, and said catalyst being present in an amount sufficient to catalyze transformation of said carbohydrate to produce a waterproof bond, and
- pressing surfaces of the material together at an elevated temperature and for a time sufficient to effect bonding by transformation of the carbohydrate, and wherein the time, temperature and pressure are sufficient to produce a waterproof bond.
Solid lignocellulosic material, bonded together with a waterproof bond by pressing at an elevated temperature with a bonding composition comprising at least one non-cellulosic carbohydrate and an acid capable of catalysing hydrolysis of the carbohydrate.
Plywood and particle board, bonded together with a waterproof bond by pressing at an elevated temperature with a bonding composition comprising at least one non-cellulosic carbohydrate an an acid capable of catalysing hydrolysis of the carbohydrate.
Dependencies are inferred from the claim text.