Acoustic Property and Hardness of Coatings for Musical Instruments with Various Coating Thicknesses
Hwang-Deuk Hwang, Hyunjoong Kim, ChungWooYang, Byoung-Hoo Lee, Jaehoon Choi · Journal of the Korean Wood Science and Technology · 2006
The relationship between acoustic property and coating hardness of musical instruments was investigated using a sound level meter and a pendulum hardness tester. Urethane topcoat, oil stain, natural oil varnish, and UV-curable epoxy acrylate coatings were applied on four different substrates: Paulownia coreana, Pinus koraiensis, Castanea crenata var. dubs and Pinus densiflora. The influence of the coating type on the acoustic properties was stronger than that of the substrate. In the case of an oil stain formed with tacky coating layer, the sound pressure level (SPL) and surface hardness decreased with increasing of coating thickness. In the other coatings, SPL decreased and hardness increased as the coating layer thickened. However, SPL began to increase again at coating thickness above 100 .um.