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

以直径较小的日本雪松原木为原料，生产了替代巴西红木吉他背板和德国云杉吉他顶板的新型木基材料。将直径20厘米的圆木边材部分用旋转车床加工成2毫米的单板。用低分子量酚醛树脂浸渍后，将单板平行层压，垂直于平面压缩。在不使用胶粘剂的情况下，用3%或5%的水溶液处理贴面，压缩至密度为0.8时，材料的动态杨氏模量（E/gamma）和tan δ在较低的频率范围内，不仅在纵向上，而且在跨纵向上，与巴西红木的动态杨氏模量（E/gamma）几乎相同。当贴面用5%的水溶液处理，用胶粘剂压缩至0.4密度时，材料的E/ γ和tan δ在纵向上几乎与德国云杉相当。吉他的音质使用树脂浸渍单板为其顶部和背板的吉他与德国云杉和巴西红木背板的吉他相媲美。

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.