Lab-service - Micronisation, Grinding, Sieving, PSD analysis
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Before Micronisation


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After Micronisation


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Press


Article published in
the magazine "DOCUMENTS"
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Article published in
the magazine "USINE NOUVELLE"

usine nouvelle
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Our company


Lab-Service was created in 1981 and is still today an independent family-run firm.

Our core business is particle size analysis, which we provide to the Chemical, Pharmaceutical, Cosmetics and Food industries.

Our leading assets are our 30 years of experience in micronisation, our reactivity, confidentiality and expert advice to our customers.

We are specialised in:
- Micronisation
- Milling and sieving
- Particle size analysis


The principle of Micronisation


micronisation

Micronisation consists of projecting powder particles against each other using converging air jets. The impact between these particles causes them to break up into smaller ones.
The microniser is basically a flat cylindrical casing with tangentially oriented inlets around the outside, through which compressed air is injected.

When powder is introduced into the microniser through the milling device, the particles are propelled by the venturi effect of the air jets, collide and break up.

The air jets induce a circular movement of particle-charged air. The centrifugal force causes the larger particles to return to the grinding zone. Once the remaining particles have reached the correct size, they are concentrated in the centre of the microniser and are pumped out through a central duct.
Micronisation makes it possible to obtain an average particle size of between 1 and 30 µm.

Grinding/Milling


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The powder is introduced into the grinder through an induction port.
It is then impelled by compressed air into the grinding chamber, where two parts rotate independently at varying speeds:
- the grinding disk, which propels the particles onto the chamber wall and causes them to break up
- the selector, through which the ground powder passes. Depending on its speed of rotation, the biggest particles can pass more or less easily through the selector and be expelled. Those particles which are not expelled go back through the grinding chamber.

When particles are below the required diameter, they go straight through the selector into the extraction duct.
Grinding makes it possible to obtain an average particle size of between 50 and 200 µm.

Sieving


broyage We use a vibrating sieve to limit the particle size distribution of a powder.
Our equipment allows us to sieve powder using mesh diameters of between 100 µm and 800 µm.



The Grinder-Sieve makes it possible to grind powder without creating fine particles by force-sieving through mesh diameters of between 400 µm and 2000 µm.
This operation allows us to break up large crystals or compacted powder. With this equipment, we can obtain an average particle size of between 100 and 1000 µm.



Practical Information
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