From Theory to Practice - Improving the Foldcrack Resistance of Industrially Produced Triple Coated Paper, 2011 PaperCon Conference

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This study is based on earlier presented computer modeling and simulation of foldcrack resistance of multilayer coated paper [1-2]. This theoretical work suggested that foldcrack resistance can be improved by control of elastic modulus and thickness of the various layers and that the balance between stiffness and foldcracking is optimized by a layer structure consisting of a thin and stiff precoat layer covered by thick and strong middlecoat layer. The proposed mechanism is that the approach lowers stress development at coating surface during folding due to stress release within precoat due to crack formation and prevents crack propagation to the surface due to the strong middle layer.