磁歪式超音波装置による石膏型の脱泡と酒類の熟成

抄録

A 400W ultrasonic wave generator, which consists of a 14 kc rectangular type magnetostriction transducer in water bath, master oscillator and power amplifier, was constructed for the purpose of industrial development of ultrasonic treatments. Blow-holes in gypsum moulds for ceramic industry were eliminated successfully. The bottom of a glass vessel filled with mixture of water and gypsum powder was set in the water bath above the transducer. By a 1. 5 minute exposure of the ultrasonic wave, the air which had adhered to the powder was almost entirely exhausted. The mechanical strength, hardness and durability against water, after the congealment, increased considerably by the treatment. Several kind of synthetized Japanese"sake"were artificially seasoned with the same apparatus. A triangular or spherical flask was filled with the sample and was suspended above the transducer in the water. When a spherical flask of resonant size(500cc)was used, an exposure of 1. 5 minute had satisfactory effect. Statistical tests of the seasoning effect were performed at the chance of public exhibition on the aniversary memorial day of our Institute in 1950 and 1951. Many people tested the taste and flavour comparing the ultrasonically seasoned and the not yet seasoned sample. At the test in the first year, 85% of 121 people prefered the ultrasonically treated one. But the result of the similar test in the next year was 52% of 178. The effect on synthetized whisky seemed to be more distinct than that on "sake".