By P.K. Chatterjee, B.S. Gupta
This booklet discusses the theoretical points of absorbency in addition to the constitution, houses and function of fabrics. The chapters are prepared in an method for the reader to improve gradually via primary theories of absorbency to more effective elements of the know-how. themes coated contain clinical ideas of absorbency and constitution estate relationships; fabric expertise together with large absorbents, non-woven, ordinary and artificial fibres and surfactants; absorbency dimension strategies and expertise point of view. The reader is supplied with present prestige details on know-how and can also be knowledgeable on very important advancements in the box.
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Additional info for Absorbent Technology
5 to 10%, depending upon the material, the fabric weight (areal density), and the bonding methodologies used. Figure 15 illustrates the impact the fiber density can have on capacity, when expressed in the units of cc fluid/g fiber, for various values of packing fraction. Figure 16 shows the relative values of the absorbent capacity of different materials expressed as a ratio with the value of a cellulosic material for any given value of packing fraction. Accordingly, the lower density materials provide an advantage in applications of fibers in absorbent products provided all other characteristics, in particular, surface wettability and mechanical properties, are equivalent.
Porosity Pores are void spaces, which are distributed extensively throughout the volume of a porous medium. Porosity q~is the ratio of the void space in a porous medium over the total bulk volume of the medium. Porosity is thus a dimensionless quantity between 0 and 1. The fraction of the bulk volume that makes up the solid walls is thus 1 - 0If Pb,,tk is the bulk density of the porous medium and p is the density of the material making up the medium, then the porosity is given by = 1 Pbulk (9) P If the porous medium is made up of regularly packed particles of uniform size and shape, the porosity can be calculated from purely geometrical consideration.
Most commercial "superabsorbents" are polyelectrolytes which have been insolubilized by crosslinking or by grafting and their structures with respect to these models are further discussed in a later chapter. 1. Equilibrium Swelling Swelling of cellulosic fibers. Cellulose fibers can undergo limited swelling by the absorption of interactive liquid. As more interactive liquid comes in contact with fibers, a fibrillar unzipping type of mechanism occurs . As swelling begins, more hydroxyl groups become accessible to accommodate more liquid, which opens up the structure and causes more swelling.
Absorbent Technology by P.K. Chatterjee, B.S. Gupta