もみ殻の圧縮成形特性に関する研究　Ｉ

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  • Research on the Compressive Forming Characteristics of Rice Husk (NO, 1)
  • モミガラ ノ アッシュク セイケイ トクセイ ニカンスルケンキュウ 1

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In order to clear the compression characteristic of the rice husk, the simple compression test, the gradational compression test and the repeated compression test were experimented using the plunger and cylinder type compression device. The physical characteristics of the rice husk were investigated before these tests. The average value of the specific gravity was 1.37-1.45, particle size distribution was rather uniform and the half of husk ranged between 2mm to 2.4mm. The value of the angle of the static repose was 51.4°, the angle of the dynamic repose was 46.3°, the angle of the internal friction was 34.2°, the cohesive force was 0.07kgf/cm2 {6.7kPa} and the coefficient of friction between the steel plate was 0.23.<br>Compression characteristics of rice husks are summarized as follows.<br>1) The following equation on the relation between the compression stress and the compression strain was obtained from the simple compression test.<br>P=α·exp β·ε<br>where, P is the compression force kgf/cm2 {kPa}, ε is the compression strain and α, β are constant values.<br>2) The relation between the compression force and the compression strain on the stage compression test was similar as the behavior on the simple compression test.<br>3) When the rice husk was compressed by the repeated constant force, the strain increased with increase of the number of compression. The compression strain had a tendency to reach the maximum value after about 10 times of repeated compression. and also the restoration ratio decreased with increase of the number of compression.<br>4) When the husk was compressed by the repeated constant stroke compression, the compression force decreased with the increase of the number of compression. The compression force had a tendency to reach the constant value after about 10 times of the repeated compression.<br>5) When the new husk was supplied in the space of the cylinder under the repeated constant stroke compression, the longer the compression stroke of plunger, the more the supplied new husk and the larger the compression force.

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