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

ISBN-10: 0444500006

ISBN-13: 9780444500007

This ebook discusses the theoretical features of absorbency in addition to the constitution, homes and function of fabrics. The chapters are prepared in an process for the reader to enhance gradually via basic theories of absorbency to more effective elements of the know-how. themes lined contain medical ideas of absorbency and constitution estate relationships; fabric expertise together with large absorbents, non-woven, average and artificial fibres and surfactants; absorbency dimension innovations and expertise viewpoint. The reader is supplied with present prestige info on know-how and is additionally expert on vital advancements in the box.

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Accordingly, that is the second parameter that needs to be modeled and predicted for a web. 2. Pore Volume One can model pore volume of a fabric that may be a single component material or a blend containing multiple components. The model presented is for the latter [133]. The analysis considers a fabric element cut to area A, whose dry mass is W and thickness, under imposed pressure P, is T (Figure 14). Mass of fiber i in the element, Wi = Wwi Volume of fiber i in the element = Wi/Pi Total fiber volume in element, Vf = WZwi/Pi Total pore (air) volume in element, Va = AT-Vf In these, i is the index representing individual components and w is the mass fraction and p is the density of the individual components.

However, excessive swelling would drastically affect the L and t relationship. The compressional effects on pulp fluff and water system were also studied by Painter and Nguyen [97] who reported m to be close to 1/2 for both linear advance L and adsorbed volume V. The wet-swelling webs were found to be at considerably higher average saturation levels than the wet-collapsing webs. However, the volumetric rate was found to be highest when the density of the pulp fluff web was in the vicinity of a "critical density" where the dimensional change of the web upon wetting is small.

Due to this interplay of forces, swelling occurs mainly along the direction of diffusion [127]. For fiber like geometry, more swelling occurs in the radial direction, and the dominant tensile stress is in the axial direction. The presence of a sharp boundary between the swollen gel and the unperturbed solid was shown by Thomas and Windle [128] as resulting from the concentration dependence of the viscous flow rate of the glassy polymer. Many authors have been able to correlate their swelling rate data by adding a linear term to the Fickian relation as follows [129-131]: V = K i t 1/2 + K2t (38) A plot of V/t 1/2 versus t 1/2 would give an indication of the degree of superposition of the two limiting cases.

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

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