Method for producing colored wood
View Patent ↗Provided is a method for producing colored wood, the method including: a step of impregnating a block of wood with an organic acid aqueous solution containing an organic acid; and a step of performing steam treatment at high temperature and high pressure on the block of wood in a wet state of being impregnated with the organic acid aqueous solution while keeping the block of wood in the wet state. In the steam treatment, the temperature is 110° C. or more and 160° C. or less and the pressure is a saturated steam pressure at the temperature.
1 . A method for producing colored wood, the method comprising:
impregnating a block of wood with an organic acid aqueous solution containing an organic acid, wherein the wood is artificially dried wood, a moisture content of the artificially dried wood is 7% to 25%, and the moisture content of the wood is measured in accordance with the Japanese Industrial Standard JIS Z2101; and
performing steam treatment at a temperature and a pressure on the block of wood in a wet state of being impregnated with the organic acid aqueous solution while keeping the block of wood in the wet state,
wherein, in the steam treatment, the temperature is 110° C. or more and 160° C. or less and the pressure is a saturated steam pressure at the temperature, and
wherein a thickness of the wood is 10 mm or more and 40 mm or less.
2 . The method for producing colored wood according to claim 1 , wherein the organic acid aqueous solution further contains a saccharide.
3 . The method for producing colored wood according to claim 2 , wherein the saccharide is at least one selected from the group consisting of fructose, maltose, xylose, and sucrose.
4 . The method for producing colored wood according to claim 2 , wherein in the organic acid aqueous solution, an amount of the saccharide is 3% to 30% by mass.
5 . The method for producing colored wood according to claim 1 , wherein the organic acid is a divalent or higher carboxylic acid.
6 . The method for producing colored wood according to claim 5 , wherein the carboxylic acid is at least one selected from the group consisting of citric acid, malic acid, and succinic acid.
7 . The method for producing colored wood according to claim 1 , wherein in the organic acid aqueous solution, an amount of the organic acid is 3% to 30% by mass.
8 . The method for producing colored wood according to claim 1 , the method further comprising:
drying the block of wood that has been subjected to the steam treatment.
9 . The method for producing colored wood according to claim 1 , the method further comprising:
obtaining a sliced veneer by slicing the block of wood that has been subjected to the steam treatment.
10 . The method for producing colored wood according to claim 8 , the method further comprising:
after drying the block of wood that has been subjected to the steam treatment, heating the block of wood under an inert atmosphere.
11 . The method for producing colored wood according to claim 10 , wherein the inert atmosphere is a nitrogen atmosphere or a superheated steam atmosphere.