Yamaha Corporation

Yoshihiro Hirano

Ritsuo Iwata

Satoshi Suzuki

Akira Yamamoto

Hiroshige Murakami

Hironori Watanabe

Katsunobu Fukuda

Yoshinobu Ohshima

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.

Method for manufacturing ligneous material

The present invention's modifying method for wood elements includes a step for soaking wood elements in one or a mixture of acetic anhydride, acetic acid, or chloroacetic acid; and a step for acetylating the impregnated wood elements in a gaseous phase. This method makes it possible to reduce the time required for the step of acetylating the wood elements, simplifies the process, reduces fabrication costs, and enables fabrication of a wood fiberboard having high dimensional stability.

Modifying method for wood elements

The wood fiberboard of the present invention comprises wood fibers which have been subjected to an acetylation treatment and wood fibers which have not been subjected to an acetylation treatment bonded together by a binder resin, wherein the content of the wood fibers which have been subjected to an acetylation treatment is 35 to 90% by weight of the total amount of wood fibers which have been treated to an acetylation treatment and wood fibers which have not been subjected to an acetylation treatment.

Wood fiberboard and manufacturing method therefor

A acetylating agent vapor is brought into contact with a material containing cellulose while continuously moving the acetylating agent, and thereby, the material containing cellulose is acetylated in a vapor phase. Solvents for dilution, catalysts, and an immersion process in an acetylating agent (liquid) are not necessary, and thereby, it is not merely the case that the process is simplified, but the acetylation period is shortened as a result of the increase in reaction efficiency, and the accumulation of excess heat of reaction in the material containing cellulose during the reaction is prevented, and thereby, the uniformity of acetylation is improved. Furthermore, in the present invention, wooden strips acetylated by this method are accumulated and modified wood is manufactured. This modified wood has superior resistance to moisture, possesses no acetic acid odor, and does not cause rusting.

Acetylation method for material containing cellulose, and manufacturing

Wood fibers obtained by the fiberization of wood are acetylated in a vapor phase acetylating agent acetic acid anhydrate or the like. The acetylated fibers are accumulated, and molded into a solid wood board. By means of the manufacturing method of the present invention, it is possible to obtain wood board which exhibits little moisture absorption and water absorption. Furthermore, the acetylation is conducted in the vapor phase acetylating agent, so that the amount of acetylating agent used is greatly reduced in comparison with the case in which the acetylation is conducted in the liquid phase acetylating agent.

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Hamamatsu, Japan

Yoshihiro Hirano