Bursting strength in some physical properties of fiberboard is recognizeｄ ａs the ｓｔａｎｄａｒｄ ｐroｐeｒｔｙ ｉｎ many case still now. We have studied systematically some physical properties of filberboards,corrugated fiberboard sheets,and corrugated fiberboard boxes,and considered whether bursting strength should be or not be the standard property in physical properties. Consequently we found the compression strength of the box,which is the most important property in the logstics,is proportional to the composite ring crush strength of top linerboard,back linerboard and corrugating medium × take-up ratio (AF:1.53) or the edge crush strength of the corrugated fiberboard sheets. But the compression strength of the box is not proportional to both total bursting strength of composed fiberboards or corrugatedfiberboard sheet. Therefore we have confirmed that the ring crush strength of fiberboard will be more inportant in estimaing the compression strength of corrugated fiberboard box in future.

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The marine transportation is well used carrying out on a long-distance trade of the heavy and volume cargoes. In the long distance voyage, the cargoes receive the external forces, so, the definite securing is necessary for prevent of cargo accidents, such as the movement or collapse of cargo by ship motions in sea-waves. A lot of attention and checks are demanded not only while the loading, unloading and securing of cargoes but also under transportation because of the cyclic loading by ship motions. In the previous studies, the fluctuation and residual tension of securing rope by oscillation could be predicted. So, in this paper, the safety degree of the rope tension is evaluated by the esidual tension curve in order to the decision of optimum initial tension of securing rope.

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