Relation between Elastic Strength and Shape for Corrugated Fiberboard under Uniform Bending in Moment Axis Perpendicular to Machine Direction. (III). On Double Wall Corrugated Fiberborad with Same Kraftliners and Corrugated Mediums in Upper and Lower Side

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An elastic stress analysis formulation for the double wall corrugated fiberboard (DWCF) with same kraftliners (KLs) and corrugated mediums (CMs) in upper and lower sides was made by simple treatment method corresponding to the deformation of the DWCF structure under uniform bending of the moment axis perpendicular to the machine direction. Then from this formation, the stress analysis for several DWCFs was performed and relations between stresses and shapes of DWCF elements were discussed in detail. Absolute maximum stresses σkimax (i=1, 2) of upper and lower side KLs are on outer and absolute maximum stresses σsjmax (j=1, 2) of CMs are on inner surfaces respectively. σkimax increases slightly with the wavelength of CMs and σsjmax decreases obviously with the wavehight. σkimax and σsimax increase obviously with the thickness and the longitudinal elastic modulus of KLs. And σkimax increases slightly with the thickness and the longitudinal elastic modulus of CMs but σsjmax increases obviously.
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