Planetary Micro Mill PULVERISETTE 7 premium line

Discover with the new FRITSCH PULVERISETTE 7 premium line a completely new dimension in high-tech milling. For the first time ever, unheard of rotational speeds and ultrafine grinding results down to the nano range.

Due to the time-saving premium grinding bowl locking-system, the automatic checking of the locks in the mill, the blocking in event of impermissible operating states and the new automatic shut-off function in event of an imbalance, man and the machine are kept safer than ever. Grinding has never been as fast and safe!

Your advantages with the FRITSCH PULVERISETTE 7 premium line:

  • FASTER
    With the FRITSCH PULVERISETTE 7 premium line you can achieve for the first time revolutionary rotation speeds of up to 1100 rpm and a sensational acceleration of 95 times the force of gravity. The resulting energy application is roughly 150% greater than classic planetary mills. The result: significantly shorter milling processes and fineness levels down to the nano range.
    Your practical advantage: Tasks are more economical and considerably finer grinding results in shorter times are delivered.
  • SIMPLER
    For the first time, the bowl and lid form a solid unit – the grinding bowls are closed gas-tight with one motion and with a second motion, they are safely locked in the mill. The grinding bowls position themselves and snap securely into place – no additional tensioning, no incorrect operation! The grinding chamber of the premium line opens and closes automatically and independently rotates the bowl mounts in a convenient position for handling.
    A well-organised touch screen provides simple and precise navigation through the menu structure; it is easy to program in precise start times.
    Your practical advantage: Absolutely user-friendly handling and time-saving – a decisive simplification of your daily work.
  • SAFER
    Safety redefined: The mill automatically detects the inserted grinding bowls via a special RFID chip, then optimises the rotation speed and prevents impermissible grinding settings.
    Especially practical: The automatic parameter check - before every grinding - guarantees exact reproducibility.

Your practical advantage: Guaranteed constant and optimal results – incorrect operation impossible!

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Creating Nano Powders with the PULVERISETTE 7 premium line

The pharmaceutical industry is involved in producing new medicines with active ingredients in the nano scale. The human body absorbs active ingredients in the nano scale faster than conventional compounds. The better bioavailability helps in minimizing the medicine dosage. Despite smaller amounts of active ingredients, the same therapeutic effects are possible and at the same time, unnecessary side effects are minimized. Nano particles are also needed in the chemical industry as their enlarged specific surface shows totally novel catalytic attributes.

The comminution of aluminium oxide is presented here as a testing system. The d50 value of the base material is 20µm. 5mm zirconium oxide balls and 0.5ml AI2O3 along with water are ground down in 60minutes to around 300nm. To reach the less than 100nm range, it is required to use tinier grinding pearls. Here zirconium oxide pearls with 0.1mm diameter is used. The results obtained after 3h are as follows:

d value [%] grain size [nm]
d10 17
d50 32
d90 80

Using the FRITSCH Laser Particle Sizer ANALYSETTE 22 NanoTec, the depicted grain size distribution was determined while considering the corresponding Mie parameters. Certain abrasion on the grinding bodies cannot be prevented with a comminution with a ball mill. This abrasion in the obtained measurements was subtracted from the original. It is possible to achieve comparable results with other hard fibrous metal oxides. In this case the comminution is always in a suspension. It is not possible to have a dry comminution. Nanoparticles have a very large specific surface. Hence the suspension is unstable during comminution end i.e. the particles re-agglomerate very quickly. Special additives must be used for stabilization.

Equipment

To achieve best grinding results, all grinding bowls and balls are available in different sizes and materials. For grinding in inert gas and for mechanical alloying use the FRITSCH PULVERISETTE 7 gassing lids – quickly and safely.

The FRITSCH EASY GTM ensures a simple and easy monitoring of thermal effects, physical and chemical reactions or increase or decrease in pressure due to continuous measurement of gas pressure and temperature directly in the grinding bowl. And the mill is automatically controlled in a manner that the set parameters are not exceeded.

When grinding in suspension use the FRITSCH Special Emptying Device. Your advantage: quick and easy separation of the grinding balls and suspension.
Your practical advantage: An extensive range of accessories guarantees optimal grinding for each application.

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