Abstract
We attempted to express a improvement formulation of elastic stresses for single wall corrugated fiberboard (SWCF) made of different kraft-liner (KL) under uniform bending (the moment axis perpendicular to the machine direction). From this formulation, bending stresses of KL and semichemical corrugating medium (SCM) for SWCF were obtained, and relations between the strength and the shape or the longitudinal elastic modulus of SWCF elements were discussed.Then following results are obtained.(1) A maximum of the absolute value of the bending stress for KL is on the outer surface in the side of the small thickness and modulus. Maximum δsmax of the absolute value for the SCM bending stress is on the inner surface at the KL·SCM joint in the side of the large thickness and modulus.(2) Maxima δk1max and δk2max of absolute values for KL bending stresses (KL1: plus stress and KL2: minus stress) decrease slightly with the increase of Ts, and δsmax increases obviously.δ1max, δk2max and δsmax decrease obviously with increases of SCM wavehight h and KL1 thickness Tk1.(3)δk1max and δk2max are constant for the increase of SCM wavelength L, and δDsmax increases with the L increase obviously.
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