FRITSCH GmbH - Planetary micro mill PULVERISETTE 7 classic line

Manufactured by  FRITSCH GmbH
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Ideal for smallest quantities

Ideal for smallest quantities 
 
The PULVERISETTE 7 classic line with 2 working stations is ideally suited for fast, uniform, and extremely fine comminution of very small samples down to colloidal fineness of hard, medium-hard, brittle and moist samples. Depending on the desired final fineness can the grinding be performed dry or in suspension. 
Besides for comminution, the Planetary Ball Mill can be utilized for mixing and homogenizing of emulsions and pastes. 
 
WORKING PRINCIPLE 
 
Comminution according to the Planetary Principle 
 
The comminution of the material to be ground takes place primarily through the high-energy impact of grinding balls. To achieve this, the grinding bowl, containing the material to be ground and grinding balls, rotates around its own axis on a main disk whilst rotating rapidly in the opposite direction. 
At a certain speed, with this configuration, the centrifugal force causes the ground sample material and grinding balls to separate from the inner wall of the grinding bowl. The grinding balls then cross the bowl at high speed and further grind the sample material by impact against the opposite bowl wall. In addition, impact between the balls themselves on the sample material adds to the size reduction process. 
Due to the enormous rotational speed of the main disk – up to 800 rpm – the PULVERISETTE 7 classic line reaches a centrifugal acceleration of up to 50 g.
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Features of Planetary micro mill PULVERISETTE 7 classic line
  • Rotational speed up to 800 rpm - precise rotational speed regulation with display of set/actual values * Fast fine grinding of small quantities * Small footprint * Simultaneous processing of 2 samples * Useful capacity up to 2 x 20 ml * Programmable microprocessor control * Up to 99 repetitions of the grinding cycle * Programme-timer for grinding operation and cooling phases * Reversing function * Energy-save function (electricity-saving mode) * RS232 interface for output of process data and programming cycles * Grinding chamber completely encapsulated, but easy to open * Cooling of the grinding chamber with a built-in fan for long grinding times * Ergonomic IP64 membrane keyboard * Maintenance-free drive with asynchronous motor and frequency converter * Extensive accessories for simplifying your daily work
General Specifications
Depth 53 cm
Height50 cm
Width 37 cm
Weight35 kg
Feed Materialshard, medium-hard, brittle, moist
Final Particle Fineness1 µm (<1)
Grinding Tool Materialsagate, sintered corundum, silicon nitride, zirconium oxide, hardened stainless steel, hardmetal tungsten carbide, polypropylene
Grinding Toolsgrinding bowls and grinding balls
Max. Feed Particle Size5 mm
Mill TypeBall Mill/Planetary Ball Mill
Operating PrincipleImpact force
Additional Specifications

Number of working stations: 2 
Grinding bowl sizes: 12, 45 ml 
Grinding ball diameter: 0.1 - 15 mm 
Max. feed size (depends on material): 5 mm 
Min. sample quantity: 0.5 ml 
Max. sample quantity: 40 ml 
Final fineness (depends on material): < 1 µm 
Typical grinding time down to analytical fineness: 3 min 
Grinding process: dry/wet 
Grinding in inert gas: only possible in glove box 
Gas pressure and temperature measurement: no 
Rotational speed of main disk: 100 - 800 rpm 
Transmission ratio planetary disk / grinding bowl: i relative = 1 : -2 
Effective diameter of main disk: 140 mm 
Centrifugal acceleration (g = 9.81 m/s²): 50 g 
Interfaces: yes 
Electrical details: 100-120/200-240 V/1~, 50-60 Hz, 740 Watt 
voltage, indicated by customer is set 
Emission sound pressure level at the workplace according to DIN EN ISO 3746 
(depending on the material to be ground, grinding bowls/balls, selected rotational speed)
: up to approx. LpAd = 82 dB

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