Abstract
The high porosity of fabrics and fibres have hindered the study of the interaction between fluids and those kind of materials. In order to understand penetration mechanisms of polymeric matrices or woven sealing, some properties such as wettability or capillarity must be analysed. The fluid speed through some woven could be compared with metallic meshes in those is easy to determine pores size. In this work it is tried to solve these problems from a theoretical point of view by using hydrostatic laws and capillarity effect.
Highlights
Capillarity phenomena together with the permeability to air and steam water are the most important factors in all types of porous materials including fibres, especially regarding natural materials
Experimental study By measuring contact angles and flow rate calculation, as it was done with metallic meshes, a glass fibre woven with an unknown porosity (Vetrotex-P-204-2400 Tex) provided by Saint-Gobain (Aachen, Germany) was studied (figures 4(a) and 4(b)
In this work the glass fibre woven is covered with a layer of thermoplastic material, as all commercial fabrics have, so plasma treatment acts on the thermoplastic layer instead of directly on glass
Summary
Capillarity phenomena together with the permeability to air and steam water are the most important factors in all types of porous materials including fibres, especially regarding natural materials. There is an inversely proportion between the contact angle on the fibres or the entry pressure of the liquid with the wettability (Kw), when one increases the other decreases. By Darcy's equation the permeability can be evaluated according to equation (4), that is defined in this case as an ability of the woven fibres because it depends on its interconnected pores.
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