Deformation dynamics in creasing and folding of board

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Abstract

Laboratory creasing and folding experiments, with dynamics similar to that of real production, were carried out to study cracking mechanisms of coated folding box boards. The study included three double-coated board grades with varied strength properties and thicknesses. The board deformation was followed with high-speed CCD imaging to determine the local strain rates together with the accumulated volume change and delamination of the board. The measured strain rates were compared with theoretically estimated creep rates. During creasing, the shear strain near the edge of the ruler dominated the deformation. However, there was a large variation in strain rates and thus stresses depending on the creasing geometry and board grade. Two main deformation modes were separated depending on the relative groove width compared to the board thickness. Small strain rates during creasing led generally to large strain rates during folding. Thus, the creasing geometry should be chosen carefully according to the board grade, with the goal of medium-level maximal strain rates (and stresses) near the surface coating in both operations.
Original languageEnglish
Title of host publicationProceedings of the International Paper Physics Conference (PaperCon 2019)
PublisherTAPPI Press
Pages232-240
Publication statusPublished - 8 May 2019
MoE publication typeNot Eligible
EventInternational Paper Physics Conference at PaperCon, IPPC - Indianapolis, United States
Duration: 5 May 20198 May 2019

Conference

ConferenceInternational Paper Physics Conference at PaperCon, IPPC
Abbreviated titleIPPC
CountryUnited States
CityIndianapolis
Period5/05/198/05/19

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Turpeinen, T., Tanaka, A., Suontausta, O., & Ketoja, J. A. (2019). Deformation dynamics in creasing and folding of board. In Proceedings of the International Paper Physics Conference (PaperCon 2019) (pp. 232-240). TAPPI Press.