Production of high quality materials for guitar top and back plate made from Japanese cedar logs with a small diameter.

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New type of wood-based materials as substitutes for Brazilian rosewood for guitar back plate and German spruce for guitar top plate were produced based on Japanese cedar logs with a small diameter, of which the utilization is limited despite its availability. The sapwood portion of logs 20 cm in diameter was processed to a veneer 2 mm using a rotary lathing machine. The veneers were laminated in parallel after impregnation with low molecular weigh phenolic resin, and compressed perpendicular to the plane. When the veneers were treated with 3 or 5% aqueous solution and compressed to a density of 0.8 without adhesives, the specific dynamic Young's modulus (E/gamma) and tan delta of the materials became almost the same as those of Brazilian rosewood in the lower frequency range not only in the longitudinal direction but also in the cross-longitudinal direction. When the veneers were treated with 5% aqueous solution and compressed to a density of 0.4 with adhesives, the E/gamma and tan delta of the materials were almost comparable to those of German spruce in the longitudinal direction. The tone quality of guitars used resin-impregnated veneer board for its top and back plate were comparable to that of guitars with a top plate of German spruce and a back plate of Brazilian rosewood.