Related Experiment Video
Updated: Aug 15, 2025

Twin-Screw Extrusion Process to Produce Renewable Fiberboards
Published on: January 27, 2021
Bending Stiffness of Honeycomb Paperboard
Gabriela Kmita-Fudalej1, Włodzimierz Szewczyk1, Zbigniew Kołakowski2
1Centre of Papermaking and Printing, Lodz University of Technology, 93-005 Lodz, Poland.
Abstract:
This article analyzes the influence of the initial deflection of the flat layers on the bending stiffness (BS) of honeycomb paperboards and presents two methods for its calculation. Both methods allow for the determination of BS in the main directions in the plane of the paperboard, i.e., the machine direction (MD) and the cross direction (CD). In addition, they have been verified by comparing the calculation results with the results of the BS measurements. The first method allowed for the calculation of the BS of cellular paperboard based on the mechanical properties of the paper used for its production. The second method allowed for the estimation of the BS of cellular paperboard based on the bending stiffness of other honeycomb paperboards with the same raw material composition and the same core cell size but with different thicknesses. In the first analytical method for the calculation of the bending stiffness of cellular paperboard, which does not include the deflections of the flat layers, the calculation results significantly differ from the measurement results, and they are overestimated. The second of the presented BS calculation methods allowed for a much more accurate assessment of paperboard's bending stiffness depending on its thickness.
Related Concept Videos
Bending of Members Made of Several Materials
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
Members Made of Elastoplastic Material
As the bending moment...
Residual Stresses in Bending
Deformations in a Transverse Cross Section
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
Bending
In pure bending, the bending stress in a beam is calculated based on the bending moment and...
Flexural Stress
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to...

