Produkteigenschaften und Verfahrenstechnik

Borho, Klaus; Polke, Reinhard; Wintermantel, Klaus; Schubert, Helmar; Sommer, Karl

doi:10.1002/cite.330630805

Cited by 44 publications

(11 citation statements)

References 13 publications

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“…These materials show a number of problematic product properties [1]. Their interparticle forces, especially van der Waals forces, exceed the gravitational forces by several orders of magnitude.…”

Section: Introduction and Problem Descriptionmentioning

confidence: 99%

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Improvement of Flowability of Fine Cohesive Powders by Flow Additives

Tomas

Kleinschmidt

2009

Chem Eng & Technol

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Most minerals and concentrates, auxiliaries, agricultural and synthetic particulate solid products are produced with particle sizes of less than 100 lm. These fine powders show similar problematic product properties. Their interparticle adhesion forces, especially van der Waals forces, exceed the gravitational forces by orders of magnitude. Thus, the trouble-free treatment of these products presents large problems as well as scientific and technological challenges. The physical properties of such materials, especially flowability, are essential for many industrial applications including product generation, processing, application and consumption, e.g., in the pharmaceutical, chemical, food and manufacturing industries or plant engineering. In recent decades, one of the most frequently used solutions to this problem has been to add small amounts of flow additives that improve the flowability of these fine cohesive powders. This paper provides an overview of the physico-chemically active principles of flow additives, model approaches and useful flowability evaluation methods. The efficiency of several flow additives, i.e., nanoparticles and surfactants, is critically discussed by the provision of selected test results from the literature. Conclusions are drawn with respect to the application of this flow additive method in process industries. Introduction and Problem DescriptionThere are many branches of the global economy, in which particulate solids, i.e., bulk solids and powders, are produced, transported, handled, converted or consumed. This include collections of particle of all sizes, usually classified as bulk solids (d > 100 lm), as well as fine (d < 100 lm), ultrafine (d < 10 lm) and nanoscale (d < 100 nm) powders 1) . Frequently, the term "bulk solids" is also used for all heaped particle collectives independent of particle sizes.Many raw materials, additives, agricultural and synthetic particulate solids are produced with particle sizes smaller than 100 lm. These materials show a number of problematic product properties [1]. Their interparticle forces, especially van der Waals forces, exceed the gravitational forces by several orders of magnitude. Thus, the trouble-free handling of these products is a serious problem as well as presenting a scientific and technological challenge. However, their physical properties, especially the flowability, are essential in several industrial applications, e.g., in the pharmaceutical, food, and chemical industries as well as in mechanical and plant engineering.Flowing or yielding means that a powder is brought to irreversible deformation, and therefore, to the desired level of flow by an external mechanical stressing event which can be a force or energy. According to this method, only the trouble-free discharge of a powder out off a storage container by its dead weight is considered as good flowability. In contrast, powders that show flow problems are classified as poorly flowing or non-flowing. Such flow problems are very frequent in the case of cohesive powders with...

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Section: Introduction and Problem Descriptionmentioning

confidence: 99%

“…This include collections of particle of all sizes, usually classified as bulk solids (d > 100 lm), as well as fine (d < 100 lm), ultrafine (d < 10 lm) and nanoscale (d < 100 nm) powders 1) . Frequently, the term "bulk solids" is also used for all heaped particle collectives independent of particle sizes.…”

Section: Introduction and Problem Descriptionmentioning

confidence: 99%

Improvement of Flowability of Fine Cohesive Powders by Flow Additives

Tomas

Kleinschmidt

2009

Chem Eng & Technol

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“…Borho et al [9] depicted the influence of process parameters on product characteristics for solids in principle. A similar proceeding was chosen in order to determine the process parameters for given target characteristics of an extruded, starch-based instant powder.…”

Section: Discussionmentioning

confidence: 99%

Product Engineering Using the Example of Extruded Instant Powders

Schuchmann¹,

Danner²

2000

Chem. Eng. Technol.

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Starch‐based instant powders are usually produced by cooking/gelatinizing in an excess of water with subsequent drying and milling. Cooking extrusion is an alternative energy‐saving process. This high‐temperature/short‐time process is determined by various process which influence the properties of the finished product, e.g. the specific weight and the solubility of the powder, as well as the viscosity and the mouthfeel of the reconstituted gel. This work aims at demonstrating the functions between product characteristics and process parameters by statistical trial planning so that a target finished product can be designed by choosing the required process parameters.

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“…The required color strength and fineness of the paint are reached by dispersing the coarse pigments by applying mechanical energy to the mixture. The relationship between particle size and color strength, illustrated in Figure 1, is characteristic for all color pigments [3,4]. This is just an example of the importance of particle size for the properties of all disperse products.…”

Section: Introductionmentioning

confidence: 99%