NC State
F. Le Gallic, M. Teil, J. Viguié, C. Martin and R. Passas. Wrinkles formation and origins: from theory of web handling to coating pilot scale experimentation. In Advances in Pulp and Paper Research, Cambridge 2022, Trans. of the XVIIth Fund. Res. Symp. Cambridge, 2022 (D. Coffin and W. Batchelor, eds), pp 391–420. FRC, Manchester, 2022.


When coating lightweight grade paper with aqueous coating color, wrinkles could appear on roll to roll coating system. This study is conducted from fundamental and theoretical point of view to laboratory experiments. The impact of water content will be taken in count. It has been experimentally observed that the appearance of wrinkles during a coating process on a roll to roll pilot depends on different parameters: web tension; misalignment angle; the coefficient of friction between the roll and the side of the paper in contact; the water content in the paper that appears to favour the wrinkles formation. Moreover, this work highlights the impact of discretisation of the variable represented wrinkles number i on the prediction model. Initial tests of the use of DIC during a tensile test have been carried out. These initial tests are very promising and the development of this technique is currently being developed. The perspective of this work is the improvement of the DIC study on the formation of out-of-plane displacement during the coating process. It can reduce the cost of non-conformities and thus reduce the waste of raw materials.

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