Contribution to the study of friction phenomena : application to paper materials

Abstract : The improvement of numerous technological processes requires a deep understanding of the paper friction phenomena. Thus, we tried to obtain a better understanding of those phenomena to improve the envelopes separation in franking machines. The standad methods for measuring the paper-on-paper friction force appeared to be limited in terms of repeatability and experimental conditions. Thus, we developed two experimental methods, at low and high speeds, respectively. We also adapted the friction measurement methods to the different contacts found in franking machines. We then used those methods to study the mechanisms responsible for the friction with the paper materials. In particular, we studied (i) the dependency of the paper-on-paper friction to the direction and length of the displacement, (ii) the influence of temperature and humidity on the paper-on-paper friction, and (iii) the main frictional properties of the envelope-on-envelope, rollers-on-paper, and pads-on-paper contacts, respectively. To finish with, we developed a model of the envelopes separation inside a franking machine. This process aims at displacing - with no damage - the bottommost envelope of a stack - and only this envelope. The model allowed us to identify, to characterize, and to propose an optimization of the main process parameters.
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Nicolas Fulleringer. Contribution to the study of friction phenomena : application to paper materials. Materials. Université de Grenoble, 2014. English. ⟨NNT : 2014GRENI071⟩. ⟨tel-01153587⟩

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