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Journal des Clients "l'échantillon" (11)

No. 36
L'art du broyage - des technologies de broyage modernes

No. 37
La NOUVELLE DIMENSION dans la préparation des échantillons et l‘analyse des particules

l'echantillon no. 34
NOUVEAUTÉS PRODUITS '09

No. 33
LA PRÉPARATION D’ÉCHANTILLONS DANS LA PRATIQUE

No. 32
PRÉPARATION D’ÉCHANTILLONS pour l’analyse instrumentale

No. 31
GRAND PRIX Saison 2008 & RETSCH nouveautés

No. 30
Broyeurs et appareils de mesure des particules pour l’analyse environnementale

No. 29
Nouveautés Les appareils de la génération 2007

No. 24
Retsch présente ses nouveaux broyeurs planétaires à billes

No. 27
Sample Preparation in Biology and Medical Science

No. 37
UNA NUEVA DIMENSIÓN en la preparación de muestras y análisis granulométrico

Rapport de tests (9)

Air Jet Sieving of Bulk Materials
Particle size analysis and particle size distribution are important criteria for the quality control of bulk materials. In a running production process, the results of a quality check must be available quickly to allow for immediate adjustment of the production parameters. Depending on the expected particle size and sample volume, different sieving methods and sieving machines are suitable for analysis. The method used for particle size analysis is primarily determined by the fineness of the material to be sieved. For dry sieving of samples with particle sizes below 40 microns, air jet sieving is the method of choice.

As pure as possivle
Even if size reduction is carried out under ideal conditions, the mechanical stress which the sample material exerts on the surface of the grinding tool causes abrasion. However, it is possible to minimize this effect by selecting suitable mills and grinding tools. If the sample material needs to be ground to sizes below 100 microns, strong mechanical forces are required which increase abrasion.

Fast and Reproducible Sample Preparation with a Vibratory Disc Mill
The Vibratory Disc Mill RS 200 from Retsch is used for the quick, loss-free grinding of hard, brittle and fibrous materials to analytical fineness.

Increasing the development efficiency of ceramic materials
The development of high-performance ceramics is determined by a large number of influencing factors. In addition to material-specific aspects, such as the chemical purity of the initial raw materials, particle size reproducibility and uniformity of particle morphology, production-specific factors also determine the final properties of ceramics.

Representative results require adequate sample preparation
The following situation is typical for many production plants: After a routine quality check, the production process is stopped or an already produced batch is suspended, because the analysis results were not within the relevant critical values. But does the tested product really deviate from the specifications? The quality control managers are convinced of this because modern analysis instruments provide results with very low tolerances. The sample in question was tested several times and the result was confirmed. The question is why the product does not match the specifications although the production parameters have not been changed in any way.
The possibility that the tested product is indeed deficient cannot be excluded. However, it is often not the product itself which causes irregular analysis results but a lack of understanding of the steps which come before the analysis.

Representative sample preparation for XRF analysis
Preparing homogeneous samples by milling

Size reduction within the context of sample preparation
In general “size reduction” is taken to mean the disintegration of solid substances by mechanical forces without altering their state.

Höchstleistung im Doppelpack
Mit der PM 100 und der PM 200 präsentiert Retsch eine neue Generation von Planeten-Kugelmühlen mit einer bzw. zwei Mahlstellen, die in diesem Produktsegment neue Leistungsstandards setzen.

Herstellung von Nanopartikel mit der Planeten-Kugelmühle
Die Herstellung von Nanopartikeln, deren Größe im Bereich von 1 Mikron und kleiner liegt, ist in vielen technischen Bereichen immer mehr auf dem Vormarsch, denn sie ermöglichen die gezielte Veränderung von Materialeigenschaften.