Planetary Micro Mill for Comminution to Nano Range

FRITSCH has successfully launched its new PULVERISETTE 7 premium line planetary ball mill. With its revolutionary new comminution concept, FRITSCH considers the needs of customers wanting to comminute small samples down into the nano range, making the PULVERISETTE 7 highly relevant to the specialty materials sectors for auto, aero, energy, defense, etc.

7 p line

Materials science, engineering and chemistry professionals make use of the PULVERISETTE 7 premium line in their work with mechanical activation, mechanochemistry, mechanical alloying, catalysts, oxides, and more. Inert milling options, along with gas and temperature measurement system and mill control software, allow more insight into process, efficiency and programmable control of the mill and process – in the right environment.

powderIn a planetary mill, the sample is placed inside a grinding bowl along with the grinding balls. The grinding bowls are fastened onto the so-called sun dial and counter rotate around the center of this disk. By beating, crushing and grinding, the sample is effectively comminuted. The maximum possible speed range for conventional planetary mills is limited and is approximately 800rpm. The decisive difference of the premium line is the clamping of the grinding bowls. Instead of clamping them onto the sun disk, the bowls are sunken into it (SelfLOCK-Technology). This now allows a maximum rotational speed inside the premium line of 1,100rpm and therefore the increase of the kinetic energy of the grinding bodies by 150%.

The sinking of the grinding bowls with the new SelfLOCK-Technology increases the safety of the process during comminution. Now the bowls are clamped into the mill with only two hand motions, which improves the process safety during grinding. Faulty operation is rendered impossible.

An RFID chip integrated into the lid of the bowl also automatically identifies the grinding bowls used. The rotation speed is optimized and impermissible grinding settings are prevented. A balance check is integrated, which prevents start-up of the mill if it is loaded incorrectly.

The completely newly developed special bowls allow for secure sealing. Any overpressure arising during grinding can be released in a controlled fashion through a built-in valve in the lid; in other words, the best conditions for achieving precise and reproducible grinding results down into the nano range.

glass sampleFor routine operation, the premium line is also capable of generating and saving various grinding programs. The variable parameters are speed, grinding time, pause times and reverse mode. It is possible to generate standard operating procedures that can be protected with a password. The premium line has USB, Bluetooth and Ethernet interfaces for integration into the IT structure of the laboratory. Naturally, all grinding parameters can be recorded and saved by special software. This makes it possible to validate the grinding process.

Grinding bowls in the sizes 20ml, 45ml and 80ml are available for the new mill. A series of different bowl materials are available for the widest range of applications. From agate to zirconium oxide, from steel to tungsten carbide, the right material exists for every application. In addition, it is possible to select from an entire range of different ball sizes. It should be noted in particular that increasingly small grinding balls are also required in order to achieve ever smaller particle sizes.

FRITSCH Milling & Sizing will exhibit on Booth 422.

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