Quality Control in Solids Process Engineering

Polke, Reinhard; Scholz, Norbert

doi:10.1002/ppsc.19850020107

Cited by 4 publications

(1 citation statement)

References 13 publications

(6 reference statements)

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“…The second step is to analyse the intermediate goals which makes it easier to make decisions about alternative processes. In a third step, the effects of intermediate aims on the subsequent steps or on the end product, i. e. on the processing properties and performance characteristics, should be clarified [3]. Structuring must be applied to consider costs, by-products, availability and safety.…”

Section: Physical Parameters Epmentioning

confidence: 99%

Property Function for Product Development

Polke¹

1987

Part & Part Syst Charact

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A knowledge of the effects of the physical parameters of solids on the product quality – the property function – is necessary for selective optimisation, to determine the cause of discrepancies and to permit corrections to be made as early as possible in a process. Property functions apply not only to the end products but to every stage of the process. The particle properties of the end product affect the quality, for example the colour strength, while those of the intermediates influence processing properties, for example the filtration resistance and subsequent process stages such as washing and granulation. In order that the property functions can be determined, the properties, performance characteristics as well as physical characteristics, must be quantifiable. Particle measuring technology was initially restricted to the measurement of physical characteristics but is increasingly becoming concerned also with performance characteristics such as the flow behavior of bulk solids and their abrasion resistance. The remaining performance characteristics can either be estimated, quantified or merely treated qualitatively.

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Section: Physical Parameters Epmentioning

confidence: 99%

Property Function for Product Development

Polke¹

1987

Part & Part Syst Charact

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1994

Process Control Engineering

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Qualitätssicherung in der Feststoffverfahrenstechnik

Polke

1990

Chemie Ingenieur Technik

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Die Eigenschaften disperser Feststoffe werden von der chemischen Zusammensetzung und vom physikalischen Produktzustand (Eigenschaftsfunktion) gepragt. Fur die Entwicklung, Herstellung und Handhabung mussen die Auswirkungen des Produktzustandes auf die Qualitatsmerkmale bekannt sein. Da Qualitatsmerkmale am Endprodukt kontrolliert werden, mufi die Charakterisierung des dispersen Zustandes zur Fuhrung eines Prozesses herangezogen werden. Ein wichtiger Grundsatz der Qualitatssicherung lautet: Qualitat mu8 beschreibbar und damit nachpriifbar sein! Der Mefitechnik kommt daher fur die Qualitatssicherung eine zentrale Bedeutung zu. Die MaBnahmen zur Qualitatssicherung orientieren sich an folgenden Schritten, die alle fur disperse Produkte ihre spezifischen Probleme beinhalten: Alle angestrebten Qualitatsmerkmale werden im Anforderungsprofil festgelegt. Der Prozefi ist zu strukturieren, und ProzeBfuhrungsgrofien mussen ermittelt werden, wobei Eigenschaftsfunktionen und Modellbildung besonders wichtig sind. Die Reproduzierbarkeit mu13 in allen Prozefiphasen sichergestellt werden. Qualitatssicherung beinhaltet das standige weitere Optimieren des Prozesses und der Produkteigenschaften.Quality assurance in process engineering with solids. The properties of solid products depend not only on chemical composition but also on the state of dispersion. The knowledge of the effect of the state on the product quality is necessary for the development, production, and handling of disperse systems. The most important step of quality assurance and quality improvement is to find a way to define the quality of product by objective criteria, allowing a reproducible control based on measurements. After defining the criteria and tolerances for quality assurance, a layout for a reproducible and controllable processing must be developed and realized on a suitable plant. It is important to define quantifiable criteria for the product state in early stages in order to recognize deviations as early as possible. This is necessary to compensate fluctuations by the means of process control. It is not sufficient to do this separately for each process step but the whole process must be considered. Nevertheless a model for the whole process, which is able to describe the correlations between product properties. processing properties, and product quality, should be available in order to recognize the quality-sensitive parameters.

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Quality Control in Solids Process Engineering

Cited by 4 publications

References 13 publications

Property Function for Product Development

Property Function for Product Development

References

Qualitätssicherung in der Feststoffverfahrenstechnik

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