| 摘要 |
PROBLEM TO BE SOLVED: To dissolve a problem of easily getting dints by increasing hardness in a surface layer part, and improve dimensional stability and shape stability by preventing strain generation even when an ambient environmental condition for a lumber after processing is changed. SOLUTION: In the laminated plasticity processed lumber 30 comprising a surface layer lumber 10 plasticity-processed so as to have approximately even compressibility over all the thickness, an inner layer lumber 20 having grooves 21 of a predetermined cross sectional shape cutting annual rings formed in the longitudinal direction of the lumber grain on a lumber front side flat grain face of a plane outside of the annual rings, and an adhesive residing between the surface layer lumber 10 and the inner layer lumber 20 to bond both of them integrally together, the depth of the cross sectional shape of the grooves 21 is not less than 20% and not greater than 90% of the thickness of the inner layer lumber 20, and the width of the cross sectional shape of the grooves 21 is within the range of 1-10 mm in order to decrease an internal stress of the inner layer lumber 20. COPYRIGHT: (C)2008,JPO&INPIT
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