Abstract
The relations are analyzed among the strengths of single, double wall corrugated fiberboards (SCF, DCF) and their shape and material model. Strength efficiencies Efs (strength per unit mass for the semichemical corrugated medium (SCP medium)) and Efk (strength per unit mass for the kraft liner (KL)) are also discussed. Obtained results are as follows;(1) The maximum value of absolute sterss σsmax for SCP medimum occurs at the contact positions of KL with SCP medium. The maximum value of absolute sterss σkmax for KL occurs on the surface of KL. σkmax is larger than σsmax. (2) σsmax and σkmax for SCF decrease as the thickness Ts (for SCP medium), thickness Tk (for KL) or height h of the corrugation increase. They increase as the wave length L of the corrugation increases.(3) σsmax for SCF decreases, but σkmax for SCF increases with the increase of the longitudinal elastic modulus Ek for KL. σsmax and σkmax increase as Tk increases.(4) Efs for SCF decreases with increasing Ts, but increases with increasing L or h. Initially Efk decreases, then increases gradually depending on Tk.(5) It is suitable to select as large value of h as possible for DCF.
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