The Mechanism and Grinding Limit of Planetary Ball Millingt JSTAGE
pm to pm in only one minute, down to l .5 pm after 4 min with 30% of the product under 1 pm which seems to be the limit of grinding under this condition. From this result, the rate of grinding in the planetary ball mill is known to be about 100 times greater than that in a tumbling ball mill and about 50 times