By J. Swarbrick(ed)
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Extra info for Handbook of Pharmaceutical Granulation Technology
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Figure 22 Monte-Carlo simulations of drop coverage. (From Ref. ) © 2005 by Taylor & Francis Group, LLC 32 Ennis Figure 23 Effect of spray drop distribution (low spray flux) on nuclei distribution: Lactose feed powder in spinning granulator. (From Ref. ) For the case of random drop deposition as described by a Poisson distribution, Hapgood (23) showed the fraction of surface covered by spray was given by fsingle ¼ 1 À expðÀca Þ ð2:10Þ In addition, the fraction of single drops forming individual nuclei (assuming rapid drop penetration) vs.
Charges may also exist at interfaces, as characterized by electrokinetic studies (28). , both dispersion and polar components) is also referred to as the critical solid surface energy of the particulate phase. It is equal to the surface tension of a fluid which just wets the solid with zero contact angle. This property of the particle feed may be determined by a third approach to characterize wetting, involving the penetration of particles into a series of fluids of varying surface tension (27,29), or by the variation of sediment height (30).
Figure 30 summarizes typical characteristic velocities, agitation intensities, and compaction pressures, and product relative densities achieved for a variety of size-enlargement processes. Last, it should be noted that the process or formulation itself cannot define whether it falls into a low- or high-agitation intensity process. As discussed more fully in the following sections, it is a function of both the level of shear as well as the formulation deformability. A very stiff formulation with low deformability may behave as a low deformability system in a high-shear mixer, or a very pliable formulation may act as a high-deformable system in a fluid-bed granulator.