The effect of cyclic environment on the compression strength of corrugated containers which are filled with carton boxes is investigated. The compression strength characteristics at constant temperature and relative humidity conditions are tested under various cyclic environmental conditions. These observations give that there is the suitable time accelerated effect for the real stacking life of those in cyclic environmental condition. The cyclic environmental model conditions for compression strength are suggested to evaluate which is the optimum design at constant environmental condition.

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The structure of the mathematical model for the compression strength of corrugated containers with contents is investigated. The characteristics of 3-dimensional curved surface which consists of 3 state variables in the model are revealed. The top clearance and the board composition of corrugated containers filled with carton boxes are two controllable factors. The graphical method of optimum design for those is demonstrated. The flow chart of optimum design for the compression strength of corrugated containers with contents is proposed by using this method and the cyclic environmental model condition. It is indicated that the theme of this study is similar to the bimatrix game of game theory.

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An elastic analysis of kraftliner (KL) and semichemical corrugating medium (SCM) for single wall corrugated fiberboard (SCF) under the perpendicular load to the KL surfaces was studied by the finite element method (FEM). Stresses obtained by this method were discussed in the agreement for results induced by the stress formation of the previous paper and for FEM results of the stress concentration at the notch of this KL• SCM joint shape under the tension. Then following results are obtained. (1) The deformations for KL and SCM are made by the bending of the fixed beam and the stress concentration of notch shape at the KL •SCM joint under the moment induced by the applied load. Ratio of normal stress σx of the machining direction to normal stress σy of the loading direction is about 1.2 at the near KL • SCM joint. (2) The values of stress components made by the constraint of the geometrical condition for SCF are very small. The values of stresses decrease with the increase of the contact width of KL· SCM joint.

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