Multifilament Cloth Permeability

In multifilament cloths, fluid flow may occur through around the permeable yams. The degree of this flow division inter-yam or intra-yam has been drown to erqrlain certain dyeing characteristics of such cloths [McGregor, 1965]. If we define Bo as the permeability of the porous yams, and Bi as the permeability of the cloth if the yam were solid, i.e. monofilament, it may be drown that  

A high fi value points to a large percentage of flow passing throu the yam. 

These equatioirs were used in an extensive study of the effect of multifilament characteristics in filtration, including such aspects as t dency to bleed, filtration mode (Chapter 2), [Rushton Hassan, 1980], The basis of this work was the premise that where particles are small enou % enter cloth pores and in the circumstances vdiere yam flow is possible (O 1), the possibility follows that such particles will follow the filtrate flow into the yams. These particles become embedded within the yams this tends to diminish yam in porosity with W approaching unity. Removal of the particles by back-wadiing becomes difficult, since back-wash will tend to follow the path of least resistance, ie. around the plugged yams. 

The problem of correlation of the permeability of multifilament materials is a avated 

Media were supplied by P S Filtration Ltd., Haslingden, U.K. CF = Continuous Filament SF = Staple Fibre 

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