Download Absorbent Technology by P.K. Chatterjee, B.S. Gupta PDF

By P.K. Chatterjee, B.S. Gupta

This book discusses the theoretical facets of absorbency in addition to the constitution, houses and function of fabrics. The chapters are prepared in an procedure for the reader to increase steadily via primary theories of absorbency to simpler elements of the expertise. issues coated comprise medical ideas of absorbency and constitution estate relationships; fabric know-how together with tremendous absorbents, non-woven, usual and artificial fibres and surfactants; absorbency dimension concepts and know-how point of view. The reader is supplied with present prestige info on know-how and can be expert on very important advancements in the box.

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Pore Size Pore size is an important parameter for absorbent materials as it affects the rate at which a fluid flows into or thorough a capillary network. This is evident from the HagenPoiseuille (eq. 3) and the Washburn (eq. 7) models. ,.. 6 Fiber Density (g/cc) Figure 15. Effect of fiber density and packing fraction on specific air volume (or absorbent capacity). 2- ~" Cell. 8 ..... 6 Fiber Density (g/cc) Figure 16. Effect of fiber density on the ratio of the specific air volume of a web containing a given fiber to that of a web containing cellulose.

B w3dld2) (74) n3 - (3w3dld2)/(wld2d3 + w2dld3 + w3dld2) (75) B. Two different fibers and an adhesive or a low melt material. As before, it is assumed that the adhesive or the molten polymer will uniformly coat the surfaces of regular fibers. The amount picked up by different fibers will be proportional to their surface areas. The net result will be an increase in linear densities, from dl and d2 to dl" and d2; and increase in mass fractions, from Wl and w2 to W 1 " and w2; and a change in densities, from Pl and/92 to Pl "and t92; respectively, for components 1 and 2.

1. General Equations for Unsteady State Flow Consider a one-dimensional horizontal flow of an incompressible fluid in the xdirection through a porous medium of uniform cross-section. By combining the law of conservation of mass and the differential form of Darcy' s equation, the following equation on saturation rate has been derived [72,73,78-81]: F(s) in the above equation is the diffusivity factor and is often referred to in soil physics as "moisture diffusivity"; the diffusivity factor is related to the permeability k via [81,82] F(s) = (~'~7) (dp/as)/O.

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