Results 261 to 270 of about 10,773 (300)
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European Journal of Pharmaceutics and Biopharmaceutics, 2012
Dry powder inhalers play a major role in today's treatment of various respiratory diseases. A lot of effort has been put into the optimization of a device and the appropriate formulation regarding its local lung deposition. However, the complexity and interactions of different factors governing powder dispersion and, therefore, its inhalable fraction ...
Hartwig Steckel
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Dry powder inhalers play a major role in today's treatment of various respiratory diseases. A lot of effort has been put into the optimization of a device and the appropriate formulation regarding its local lung deposition. However, the complexity and interactions of different factors governing powder dispersion and, therefore, its inhalable fraction ...
Hartwig Steckel
exaly +3 more sources
Powder material rheology under belt transportation
, 1997 Particulate solids flow on plane moving media, by translation (conveyor belts, chain carriers, slopes), or vibration (conveyors) is realized by mono or multi-layer feed. When it is necessary to realize high solid flows, or, on the contrary, it is not necessary to discriminate the solids at the end of the transporting, the particles are fed in bulk, in ...
BONIFAZI, Giuseppe +2 more
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Rheology of Nanometric Powders
Advances in Science and Technology, 2006Use of environmentally friendly processing additives for nanometric powders has tremendous technological implications. In this study, the rheology of aqueous nanometric alumina powdersuspensions and variation of viscosity with solids content and with fructose concentration were studied by rheometry.
Mufit Akinc, Chuan Ping Li
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Rheologica Acta, 1990
This paper studies the slow flow of powders. It is argued that since powders can flow like liquids, there must be equations similar to those of liquids. The phenomenon of a variable density, dilatancy, is described by an analogue of temperature called the compactivity X. Whereas, in thermal physicsT = ∂E/∂S, powders are controlled byX = ∂V/∂S.
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This paper studies the slow flow of powders. It is argued that since powders can flow like liquids, there must be equations similar to those of liquids. The phenomenon of a variable density, dilatancy, is described by an analogue of temperature called the compactivity X. Whereas, in thermal physicsT = ∂E/∂S, powders are controlled byX = ∂V/∂S.
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Rheology of Mixed Powder Plastisols
Powder Metallurgy, 1986AbstractPlastisols of fine iron and hardmetal powders, mixed with binder systems based upon polystyrene and polyethylene, have been formulated from which basic Theological data have been obtained. These data indicate that the plastisols with powder volume loadings up to ∼80% will flow satisfactorily under injection moulding conditions. Viscosity levels
D. A. Issitt, P. J. James
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On the rheology of packed polymer powders
Polymer Engineering & Science, 1980AbstractThe rheology of polystyrene powder beds was examined by two kinds of experiments. From stress relaxation measurements during powder compaction, it was found that relaxation at the shorter times could be attributed to sliding between particles. This is followed by a relaxation attributed to the deformation of the polystyrene particles themselves.
Kaoru Umeya, Ryuichi Hara
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Characterizing the Rheology of Powders by studying dynamic avalanching of the powder
Particle & Particle Systems Characterization, 1994AbstractAvalanching of solids is an important multivariable dependent phenomenon that can be a valuable tool for characterization of solids flowability. Although avalanching by itself is primarily chaotic it appears that the fractal analysis of its avalanching mass data can yield very interesting and significant information that is of importance in ...
Saurabh Rastogi, George E. Klingzing
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The Application of Powder Rheology in Additive Manufacturing
JOM, 2015Additive manufacturing (AM) is sensitive to powder variability when applying fine layers in a uniform manner. This demands a high degree of consistency and repeatability in the feedstock. Particle size is often used as a critical quality attribute, but this is not sufficient to fully qualify a feedstock.
Jamie Clayton +2 more
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Morphology of powders and rheology of stabilized suspensions
Russian Journal of Non-Ferrous Metals, 2008A relation between rheological properties of stabilized suspensions of dispersed powdered metals and their morphological properties is considered. It is shown that the stabilized suspensions belong to pseudoplastic systems and their concentration depends directly on the relative tap density of powders.
V. N. Antsiferov, V. D. Khramtsov
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Rheology in metal powder injection molding
Journal of Central South University of Technology, 2007By experimental investigation, the various viscous models are compared and evaluated. The proper viscose model is selected for the application in the metal powder injection molding processing analysis. The effects of the different processing parameters, such as the viscose parameters, temperature, pressure, die cavity size on the isothermal and non ...
Shu-quan Liang, Yan Tang, Bai-yun Huang
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