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LGP2, a center of innovative research

Paper, print media and biomaterials

LGP2, a center of innovative research
LGP2, a center of innovative research

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LGP2 - Contribution to the study of friction phenomena. Application to paper materials

Published on January 12, 2015
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December 11, 2014

Nicolas Fulleringer defended his University of Grenoble Ph.D. thesis entitled "Contribution to the study of friction phenomena. Application to paper materials".

[legende-image]1383921697611[/legende-image]This thesis was prepared at the LGP2 Laboratory under the supervision of Jean-Francis Bloch, Associate Professor, at Grenoble INP-Pagora.

The optimization of numerous technological processes requires a deep understanding of the paper friction phenomena. This thesis aims to better understand these phenomena in order to improve the envelopes separation in franking machines.

First, standardized methods for measuring the paper-on-paper friction force having proved limited in terms of repeatability and experimental conditions, two measurement methods ? low and high speed ? were developed. Similarly, the friction measurement has been adapted to the different contacts encountered in franking machines.
Secondly, these methods have been used to study the mechanisms of friction with the paper material including the dependency of the paper-on-paper friction to length of the displacement, the influence of both temperature and humidity on the paper-on-paper friction, and the main frictional properties of the envelope-on-envelope, rollers-on-paper, and pads-on-paper contacts, respectively.
Thirdly, a comprehensive model of the envelopes separation in a franking machine was created. This process aims at displacing, with no damage, only the bottommost envelope of a stack of envelopes. This model allows to identify, characterize and propose an optimization of the main process parameters.

Press release
Ph.D. thesis of LGP2 (2014)

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Date of update January 12, 2015

Grenoble INP Institut d'ingénierie Univ. Grenoble Alpes