Accuracy in the Measurement of Characteristic Particle Size with Grind Gauge
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概要
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Influence of particle shape and pigment level, φ<SUB>υ</SUB>, on grind gauge values, G and its accuracy were investigated with four pigments (Fly Ash, PMMA, Chalk, Bentonite) and linseed oil varnish as vehicle and grind gauges of 25 μm and 100 μm full scale.<BR>The values of G increased with increasing φ<SUB>υ</SUB>, for the pastes having the same particle size distribution. By the modification of reading, constant values of G was obtained independent of φ<SUB>υ</SUB>,. The values of G correspond to the particle size of about 1% cumulative oversize by number, R. This is valid for pigments of which the particle size distribution of R decreases exponentially with particle size. A variance of G was about 0. 71 in the case of 25 μm full scale, and it was found that the variance of G was influenced with the reading error a little and with other errors significantly. The values of G changed with the angle between scraper and grind gauge, and it had minimum value in normal scraping of the angle of 90°. The motion of particles in the paste and the generation of the scratch on grind gauge groove while being scraped were observed with microscope.
- Japan Society of Colour Materialの論文