# US 6,723,766 B1 · Method for manufacturing ligneous material

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- Number: US 6,723,766 B1
- Document ID: US6723766B1
- Status: Granted
- Kind: B1
- Application number: 09/591,239
- Filed: 2000-06-09
- Granted: 2004-04-20
- Earliest claimed: 1999-06-10
- Assignees: Yamaha Corporation
- Inventors: Yoshihiro Hirano; Ritsuo Iwata; Satoshi Suzuki
- Web page: https://patentgrep.com/patent/US6723766B1

## CPC

- B27N 3/04: from fibres
- B27N 1/00: Pretreatment of moulding material
- B27N 3/002: {characterised by the type of binder (compositions of macromolecular compounds C08L)}
- B27N: MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL (containing cementitious material B28B; shaping of substances in a plastic state B29C; fibreboards made from fibrous suspensions D21J; drying F26B17/00)

## Abstract

The present invention relates a method for manufacturing ligneous material, characterized in comprising the steps of acetylating wood elements selected from among wood pieces crushed from lumber, thin wood plates peeled from lumber, and wood fiber obtained by means of defibrating lumber, such that the degree of acetylation (weight percent gain) is 7% or greater, and preferably 7 to 18%; and binding the resultant aceylated wood elements, using a binder containing polyisocyanate. Thereby, it is possible to provide inexpensive ligneous material which exhibits only minor dimensional changes from moisture, wherein only a small amount of formaldehyde is released.

## Claims

### Claim 1

A method for manufacturing ligneous material, the method comprising:
preparing first wood fibers which are acetylated with a first degree of acetylation, and second wood fibers which are not acetylated, wherein said first degree of acetylation measured in weight percent gain is 7% or greater; and
binding a first amount of said first wood fibers and a second amount of said second wood fibers with a binder to form a composite,
wherein said binder comprises polyisocyanate and a thermosetting resin, the content of said polyisocyanate is 50% by weight or greater with respect to the a amount of said binder, and wherein the average degree of acetylation measured in weight percent gain of said composite is 7 to 18%, and
wherein said first wood fibers have a diameter of 0.1 to 1.0 mm.

### Claim 2 (depends on 1)

The method for manufacturing ligneous material according to claim 1, wherein said first wood fibers are acetylated by placing wood fibers in a gas or liquid which contains acetyl groups.

### Claim 3 (depends on 1)

The method for manufacturing ligneous material according to claim 1, wherein said first amount is 50% by weight or greater of the total amount of said first and second wood fibers and said second amount is less than 50% by weight of the total amount of said first and second wood fibers.

### Claim 4 (depends on 1)

The method for manufacturing ligneous material according to claim 1, wherein said binder contains polymeric 4,4-diphenylmethane diisocyanate.

### Claim 5 (depends on 1)

The method for manufacturing ligneous material according to claim 1, wherein said first wood fibers arc produced by defibrating wood chips.