Method for Improving Acoustic Properties by γ-ray Irradiation and Heat Treatment of Musical Instruments

摘要

It is well known among musical instrument makers that aging materials which have been sufficiently dried for a long time in the case of the flavor plate material for musical instrument manufacture are well known. Acousologists recommend keeping at least 3 to 100 years in a dry condition. In Japan, high-grade grand pianos are stored for 6-8 years. The pressure is considerable. Violin and kita makers buy more than three or four times the price depending on how many years of well-preserved spruce veneers have been aged. However, it is extremely economically and practically difficult to store artificially dried fragrances for more than a few decades, especially in the case of mass sandals, which is very difficult. The domestic piano manufacturing industry rarely ages artificially dried and flavored boards, and most of them have no choice but to use them immediately.;Therefore, the present invention is to improve the acoustic properties of the musical instrument flavor plate material more than the equivalent to the aging material in a short time or to improve the quality of the lower-grade inverter material by r-ray irradiation treatment or r-ray irradiation It is a method to improve the quality of the flavor plate material by treating the combined method of heat treatment. The acoustic r-ray treatment was the most effective at 1000 rad irradiation and the 28.2% sound properties were improved. In the combination of r-ray and soft-treatment quantum method, the r-ray treatment is first processed in a low region (100-1000rad) to induce a change therein, and then heat-treated, but the temperature and time are adjusted according to the species. It is a method of improving the acoustic properties of the acoustic plate material, which saves more time than the acoustic heat treatment alone, by processing in a region where the throughput is much lower than the dimensional stabilization heat treatment (eg, 220 ° C., 15 minutes).