| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical quality evaluation method of wood, evaluating a plurality of evaluation items at once, including the presence of a flaw by using a near infrared spectrum, and enhanced in productivity.SOLUTION: Wood W is irradiated with near infrared rays and the strength characteristics, water content and flaw of the wood are simultaneously evaluated with the near infrared spectrum obtained from the reflecting light from the wood. As the evaluation items related to the strength characteristics of the wood, bending Young's modulus, dynamic Young's modulus and bending strength are included. The density of the wood is also evaluated at the same time. It is preferable to irradiate the wood with near infrared rays from the region above the wood fed on a belt conveyor along the belt conveyor in the longitudinal direction over the whole in the width direction of the wood. As the wood W, wood used for manufacturing a laminated lumber is preferable. |
