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Textile Research Journal
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Permeability Measurements of Strained Fibrous Networks

X. Thibault

ESRF BP 220 38043 Grenoble Cedex 09 France

J.-F. Bloch

EFPG BP 65 38402 St-Martin-d'Hères Cedex France, jean-francis.bloch{at}efpg.inpg.fr

Textiles are used in many industrial applications. For example, they are used in papermaking. Indeed, during the pressing of paper, felts are used to transport the wet paper web and to recover the water expressed from the wet sheet. To improve this operation, felt permeability has to be characterised. This property does depend on the fiber diameter and the whole structure, which is constituted of a base and a batt. Moreover, the different fibers may be mechanically entangled in order to improve the directional permeabilities. This paper describes the equipment developed to measure water permeability of fibrous media. Next, experimental results of felt samples are presented. The investigation on felt permeability tensor allows improvements in both felt design and process modeling. After a brief introduction, this paper is divided into four parts. The first one focuses on the presentation of the experimental device used for the permeability measurements. The second deals with the description of the experimental protocol. Results and discussion are presented in the third part. Finally, a conclusion will end this paper.

Key Words: fabrics/textiles • porosity • permeability • anisotropy • measurement

Textile Research Journal, Vol. 78, No. 6, 473-485 (2008)
DOI: 10.1177/0040517507081912
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