While sawing logs along the pith to produce lumber, warps would occur in lumber due to the release of residual stress. Correction sawing should be performed to correct warps, so warps decrease the yield of lumber. Therefore, it is crucial to find a way to produce straight lumber without correction...

Exposure to outdoor conditions can cause chemical components on wood surfaces to deteriorate. To develop effective wood protection methods, a deep understanding of the mechanisms of weathering-induced wood surface degradation is required. However, the effects of outdoor exposure on wood at the...

After an overview of the antiviral effects of volatiles emitted from natural materials, such as essential oils, volatiles, etc, we examined the comfort of wooden houses and tatami mats which emit various volatiles in Japanese environments. As a result, volatiles emitted from them have a potential...

This study examines a simple estimation method for the measurement of the mass of an on-site log through a vibration test. In this method, rather than the log itself, a cut end portion is weighed. For this purpose, the vibration method with additional mass (VAM) was applied to Sitka spruce (Picea...

Sticker stain is a material defect that results from moisture migration during wood drying, often spoiling the appearance of the surface of wood products. The effect of drying temperatures on the occurrence of surface sticker stain was investigated using Japanese cedar (Cryptomeria japonica D. Don) ...

This study evaluated the relationship between log quality and lumber recovery of Cryptomeria japonica by different grading methods and bending properties before and after ACQ treatment. The results showed a low correlation between log diameter and lumber recovery, but an increase of lumber recovery ...

The catalytic hydrogenolysis of softwood lignins is normally conducted at temperatures below 200°C but tends to provide monomer yields of less than 30 mol% as a consequence of the non-cleavable 4-O-5 and condensed (C-C) linkages of phenylpropane units in lignin. In the present study, catalytic...

Cross-laminated timber (CLT) panels are fabricated with their layers stacked crosswise. Owing to the low shear modulus and strength in the rolling shear direction, the shear properties of cross-layers influence the overall deflection and shear capacities of CLT panels. The aim of the present study...

Vapor-phase acetylation of heartwood in Japanese cedar wood (Cryptomeria japonica D. Don) was carried out as a surface acetylation method to elucidate the relationship between the depth of acetylated area and fungal decay resistance. The acetylated wood (VPAW), prepared with acetic anhydride vapor...

The lateral enlargement perpendicular to the compressive direction for small thin boards of Cryptomeria japonica was investigated to evaluate the effects of density and compressive directions to the radial (plane-sawn board) and 45 degrees of tilt to the radial (45° sawn board). Samples were...