試作した簡易もみ胴割れ検定器

抄録

1) The authors constructed an experimental crack tester for unhulled rice. The tester consisted of (1) a source of light (1), (2) a sample unhulled rice box (3), (3) a light control board (4) and (4) a dark room (5) (Fig. 4). The light control board is the most important part. Therefore, three kinds were tried. These were as follows; (1) Slit slide type, (2) Pin hole slide type, (3) Pin hole fixed type (Fig 5).
2) The procedure of testing was as follows: put fifty grains of unhulled rice into the sample unhulled rice box, then set them on the light control board. Then switch on the light and slide from the right to the left the sample unhulled rice box on the light control board, and check shadows that will appear at the cracks. Thus a user can tell cracked rice from uncracked one.
3) The percentage of detection by using this tester was on the whole 83%, and that of pin hole fixed type was from 90 to 98%. If a user masters, the method of using the tester, the percentage will be more than 90%.
4) The time reqiured to test fifty grains of unhulled rice was from 3 to 4 minitues. Namely, the necessary time of this tester is one-third, that of a crack tester for hulled rice usually needed. The most efficient light control board was the pin hole fixed type