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US 6,632,326 B1Granted
Modifying method for wood elements
AssigneeYamaha Corporation
InventorsYoshihiro Hirano, Ritsuo Iwata, Hiroshige Murakami
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Abstract
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.
Claims14
A fabricating method for wood fibers comprising the steps of:
- acetylating wood elements to form acetylated wood elements having a degree of acetylation being in a range of 10 to 30% based on rate of weight increase in the wood elements;
- drying the acetylated wood elements with warm air to remove odor;
- defibrating the acetylated wood elements after drying by digesting the acetylated wood elements after drying under high-pressure steam at a temperature of 150 to 170° C. for forming acetylated wood element fibers;
- and
- coating the acetylated wood element fibers with a binder resin whose amount is 5 to 25% by weight of a solid component with respect to wood fibers.
2 more elements
Dependencies are inferred from the claim text.