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[September 2003]
Optimised Size Reduction of Thermally Sensitive Samples
Retsch GmbH & Co KG (Haan, Germany) says its Beater Mills SR 200 and SR 300 are being used for the preparation of soft, medium-hard and brittle materials for analysis. In these particular mills, size reduction takes place by impact and shear forces between rapidly rotating rotor and fixed ring sieve. Preliminary size reduction takes place at the rotor, followed by fine size reduction between the rotor and the sieve.
Retsch offers rotors which are optimised for applications involving large amounts of samples and sample materials that are thermally sensitive, that contain small amounts of fats and oils, or that are soft (with a Moh's hardness of <3).
With their small diameter, these so-called 'distance rotors' ensure a larger grinding gap which leads to a reduction in frictional heat. This lower degree of warming of both the mill and sample material prevents the sieve from becoming choked up and the rotor from being blocked.
The use of distance rotors is advised for the size reduction of a variety of materials, for example powder coatings, phenol resins, gelatine granulate etc.
www.retsch.de
ENDS