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 improve steadily via basic theories of absorbency to simpler features of the know-how. issues coated comprise medical rules of absorbency and constitution estate relationships; fabric know-how together with tremendous absorbents, non-woven, traditional and artificial fibres and surfactants; absorbency dimension recommendations and know-how point of view. The reader is supplied with present prestige info on know-how and can also be expert on very important advancements in the box.

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2. Two c o m p o n e n t f a b r i c These may contain two different fibers, or a fiber and a low melt polymer. g. wettability and resiliency, and that of the latter will be to have a structure that could be bonded by heat. A. e. the number of fibers out of 3 belonging to type 1 and 2. These are determined as shown below [133]. From Equation 49, nl [ n2 = Wld2 [ w2dl (68) n 1 = 3 w i g 2 / ( w i g 2 + wzd 1) (69) 43 n2 = 3 - n1 (70) B. One fiber and an adhesive This will also cover a fabric containing a regular and a low melt fiber, the latter after melting coating the fiber and serving as an adhesive.

But in a cross-linked network as the chains between cross-links become increasingly elongated, an elastic retractive force develops. The swelling will stop at an equilibrium point when the swelling force is balanced by the retractive force. Networks of water soluble polymers give rise to the so-called "hydrogels". Examples of these range from the highly swollen "superabsorbents" to the slightly swollen soft contact lenses. The swelling equilibrium is dependent on the entropy of dilution, the heat of dilution, and the entropy of the polymer network.

Area of capillary = AT -~o Z De J (63) or, by combining eq. 63 with 53, (64) Equation 64 for the interstitial area bounded by three fibers randomly arranged, exactly equals eq. 56, developed for the unoccupied area of the triangle for the case of the parallel arrangement of fibers. Thus, for either the parallel or the random arrangement of fibers, the two-extreme structures considered, the capillary radius is given by eq. 59. For any 42 other arrangement of fibers, therefore, the capillary radius can also be given by the same equation.

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