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Relating papermaking process parameters to properties of paperboard with special attention…
Fig. 8 Effect on the failure envelope of having different density in the middle ply
Discussion and conclusion The development of analytical models can help us to bet- ter understand how paperboards behave under different loading conditions. One alternative approach would be to develop finite element models to do the same kind of anal- ysis. Both methods have their respective advantages and drawbacks. The main advantage with the model presented
here is that it quickly can correlate papermaking param- eters to potential risks and do simple parameter studies; this by utilizing Excel. Splitting and free laying of the top, middle, and bottom plies of paperboards that had been produced during different trial gave us a good database to develop phenomenological models of strength that was dependent on density, degree of anisotropy, and fiber length. Typical values from this data set were used to perform simulation of folding of paperboard.
Fig. 9 Effect on the failure envelope of orientation: (left) bottom and top plies, (right) middle ply
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