Compaction of Powders. III. Comparison of Compaction Behaviours among Various Powders

概要

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Various powders are compressed at the constant rate of displacement of upper punch equal to 0.332 mm/sec for the comparison of the results to those in the cases of potassium chloride and lactose powder reported in the previous paper. Consequently, from the patterns of changes of pressure-transmission-ratio with the increase of upper punch pressure, the powders are divided into three classes, as followings ; (1) KCl type, for which the pressure-transmission-ratio takes the maximum value at the almost constant porosity (about 32%) without reference to material and net volume, (2) lactose type, for which the values of the ratio decrease monotonously, and (3) the powders not belonging to KCl and lactose type, for which the values of the ratio do not decrease. Besides, the comfirmity of the results to the Janssen's equation is checked up. Furthermore, the powders are compressed continuously under the constant pressure of upper punch for the hours for the purpose of examining the creep properties.
社団法人日本薬学会の論文
1975-02-25