青果物輸送の等価再現化に関する研究　Ｉ　　多段積載時の段ボール箱および内容レタスの振動特性ならびに損傷性

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タイトル別名
  • Engineering Approach to Simulated Transportation Test for Fruits and Vegetables (I)
  • セイカブツ ユソウ ノ トウカ サイゲンカ ニカンスルケンキュウ 1 タダン
  • 多段積載時の段ボール箱および内容レタスの振動特性ならびに損傷性

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For the purpose of practising a resonable and effective simulated transportation test in the laboratory, vibrating characteristics and in-transit mechanical injury of lettuce filled in carton-boxes and stacked in seven layers were examined. The results were obtained as follows.<br>1. Transmissibility of acceleration and phase characteristics of the stacked carton-boxes.<br>(1) Transmissibility of acceleration of carton-boxes was affected by the banding and the location in the stack of carton-boxes.<br>(2) The maximum transmissibility was obtained at the top carton-box of the seven layers at the frequency of 8Hz for the unbanded and 13Hz for the banded stack of the carton-boxes. The frequency was considered to be resonant.<br>(3) The effect of banding on decreasing the acceleration in the carton-box was expected at the frequency lower than 10Hz.<br>(4) Phase difference between oscillating table and carton-boxes changed much due to the frequency, location in the stack and banding practice. The phase difference was minimized by banding at the frequency lower than 10Hz.<br>2. Transmissibility of acceleration and phase characteristics of lettuce filled in the carton-boxes.<br>(1) Resonant frequency of lettuce filled in the carton-box was in the vicinity of 28Hz.<br>(2) High acceleration which occured at the upper part of the stack was prevented by banding at the frequency lower than 10Hz.<br>(3) Phase difference between lettuce and carton-box was small at the frequency less than 10Hz, then increased with the increase of frequency although it was not affected by banding.<br>3. Factors affecting the damage of lettuce in the carton-box.<br>(1) Damage of lettuce, under the multi-stacked cartons, should be considered only at the frequency of about 10Hz.<br>(2) Lettuce was damaged by a free rotating motion in the-carton-box excited by the resonant frequency.<br>(3) The relation between G and N was obtained as follows.<br>G4·17·N=5.32×103<br>G: acceleration of lettuce in carton-box.<br>N: repeating number of vibration permissible from the point of marketability.<br>(4) Damage was reduced by filling the lettuce in the carton-box with cutting butt downward.

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