Analytical prediction of package collapse – consideration of windows in the package

Windows in a package is a common way to promote the product. The possibility to predict the collapse load for these types of cartonboard packages is considered. It is shown that reliable estimates of the collapse loads can be obtained by a very simple approach. This approach is a straightforward generalization of the proposal by Ristinmaa et al. (2012): for a side that contains a window, one simply removes the strip of the package side in the loading direction that contains the window. The calculation procedure is described in detail. As a test of the calculation procedure, comparisons are made with experimentally obtained collapse loads for packages containing windows with different sizes and locations.