| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method of a heat-treated lumber which provides efficiently a heat-treated lumber suppressed in secular discoloration due to light, being excellent in dimensional stability and resistant to problems of chips and differences in color tone during shape formation and keeping texture of wood.SOLUTION: A production method of a heat-treated lumber includes: a pressure reduction treatment step of housing a to-be-treated lumber, or natural wood, in a closed space and keeping the internal pressure of the closed space at 50 kPa or lower; a super-heated steam treatment step of introducing super-heated steam into the closed space to house the to-be-treated lumber decreased in oxygen content by the pressure reduction treatment to heat the to-be-treated lumber to a temperature of 170°C or higher; and a discoloration acceleration step of subjecting the to-be-treated lumber after the super-heated steam treatment step to a discoloration acceleration treatment.SELECTED DRAWING: None |
