Effects of oriental lacquer (urushi) coating on the vibrationnal properties of wood used for the soundboards of musical instruments

In order to investigate the possibility of Oreiental lacquer (urushi) as a coating for the wooden -soundboard of musical instruments, the effects of urushi coatings on the vibrational properties of wood were compared to those of conventional coatings.By coating,the dynamic Young's modulus of wood decreased sligthly in its fiber direction whereas that in the radial direction increased . The most remarkable changes due to coating were recognized in the internal friction of wood Q,especially that in the radial direction .The effect of the urushi coating on the Q of wood was relatively small and very close to those of polurethane coating used for the soundboard of harp. The viscoelastic and mechanical properties of urushi lacuer films were also similar to those prlyurethane lacqer film. These results suggested the possibility of urushi as a coating for harp soundboard The effects of coatings on the vibrationnal properties of wood were explained by using a model considering three layers,the uncoated wood,coating layer, and a layer consisting of lacquer and wood cell wall.