It is the important subject of packaging test to evaluate of the repetitive shocks on truck bed during transportation and setting the appropriate level of the bounce vibration test. In previous studies, it is pointed that velocity change during impact is important for evaluating the shocks and conducting bounce vibration test. However, to our knowledge, there are no examples calculating velocity change on truck bed. In this study, the way to calculate time series velocity form acceleration by Fourier transform and low cut filter, which is used in earthquake engineering was applied to analysis of truck bed vibration. We propose the way to calculate velocity change by time series velocity.

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Paper, which is used most often as a base material for packaging, gradually fatigues or degrades during long-term preservation with or without mechanical loading1,2). As a preliminary of study on fatigue of paper 3), paper specimens were periodically extended up to various tensile load using a standard tensile tester and was also continuously folded under various tensile load using a MIT folding endurance tester, and some mechanical properties of these fatigued papers were examined in this study.

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