粉体の圧縮成形に関する研究(第3報) : 粉体の圧縮機構についての考察その2

概要

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In the present report, relaxation rate constant k, which is the reciprocal of relaxation time, has been evaluated in order to investigate the compression mechanism of powder. Microcrystalline cellulose powder obtained by crushing the tablet compressed at the pressure 3000 kg/cm^2 is used as sample (SA) in the experiment. The hardness of SA tablet is lower than that of the tablet of microcrystalline cellulose (A) without any treatment at the same compression pressure. In order to explain the above difference the relaxation rate constant k of SA to the applied pressure was discussed in comparison with the case of A. As the results, it is revealed that the plastic property disappears in the pressure range of 500 to 1200 kg/cm^2 and that the structure-fixed state which was introduced in the previous report is rather unstable in the pressure range of 1200 to 2200 kg/cm^2. The SA rate constant k remains at low value in the pressure range of 2200 to 2800 kg/cm^2,where the decrease of hardness seems to be due to strain recovery. It is that displacement, relative density and hardness are governed by the rate constant k. This result is consistent with that of the previous report.
公益社団法人日本薬学会の論文
1969-03-25