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board were measured, i.e., (a) residual thickness after elastic relaxation, (b) decrease in bending stiffness, (c) decrease in torsional stiffness, (d) decrease in shear stiffness and (e) decrease in edge crush strength. The reduction in stiffness was checked in two mutually perpendicular directions (i.e., in machine direction and cross direction), while the strength reduction was checked in cross direction only. A correlation was found between intentional and controlled crushing and the corresponding reduced stiffness. It was observed that the best match between the amount of crush and the reduction in stiffness for all specimens tested occurred in the shear stiffness test (SST). The paper also presents numerical and analytical tools for quick and reliable calculations of degraded stiffness of crushed corrugated cardboard samples. For selected crushing levels of the corrugated cardboards the stiffnesses of the representative volume elements were computed. In further research, the impact of the crushing of corrugated board for double-walled structures on the packaging performance will be studied. Author Contributions: Conceptualization, T.G. (Tomasz Garbowski) and T.G. (Tomasz Gajewski); methodology, T.G. (Tomasz Garbowski); software, T.G. (Tomasz Gajewski) and D.M.; validation, T.G. (Tomasz Garbowski), T.G. (Tomasz Gajewski) and D.M.; formal analysis, T.G. (Tomasz Garbowski), T.G. (Tomasz Gajewski) and D.M.; investigation, T.G. (Tomasz Garbowski), T.G. (Tomasz Gajewski), D.M. and R.J.; writing—original draft preparation, T.G. (Tomasz Garbowski), T.G. (Tomasz Gajewski) and D.M.; writing—review and editing, T.G. (Tomasz Garbowski), T.G. (Tomasz Gajewski) and R.J.; visualization, T.G. (Tomasz Gajewski) and D.M.; supervision, T.G. (Tomasz Garbowski); project administration, T.G. (Tomasz Garbowski); funding acquisition, R.J. All authors have read and agreed to the published version of the manuscript. Funding: The APC was funded by the National Center for Research and Development, Poland, grant at Werner Kenkel Sp z o. o., grant number POIR.01.01.01–00-1306/15–00. Institutional Review Board Statement: Not applicable. Informed Consent Statement: Not applicable. Data Availability Statement: The data presented in this study are available on request from the corresponding author. Acknowledgments: The authors thank AQUILA VPK Wrzesnia for providing samples of corrugated cardboard for the study. The authors also thank to Femat Sp. z o. o. for providing the laboratory equipment and commercial software. Conflicts of Interest: The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses or interpretation of data; in the writing of the manuscript or in the decision to publish the results.
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