Ultra Centrifugal Mill

Rotor mills are used for high-speed size reduction of soft to medium-hard as well as temperature-sensitive or fibrous materials.

The powerful Ultra Centrifugal Mill ZM 300 provides maximum grinding performance combined with ease of use. The variable speed from 6,000 to 23,000 rpm allows for gentle, neutral-to-analysis sample preparation in a very short time.

Thanks to an integrated temperature monitoring system, reproducibility is guaranteed even for long grinding processes or pulverization of large sample volumes.

The wide selection of rotors, ring sieves and cassettes makes the ZM 300 a true allrounder which meets the requirements of a great variety of size reduction tasks.

CRYOGENIC GRINDING

Cryogenic or cold grinding is the ideal solution for pulverizing samples that cannot be reduced to the required fineness at room temperature. This procedure involves the use of grinding aids such as liquid nitrogen (-196 °C, embrittlement of the sample outside the mill) or dry ice (-78 °C, sample/dry ice mixture) to embrittle the sample material by cooling, and thus improve the breaking behavior.

In addition, highly volatile components are better preserved in the sample by cooling. Cryogenic grinding is easy to perform with the ZM 300 and is recommended especially for plastics or very temperaturesensitive samples.

IDEAL FOR LIGHT & HEAT-SENSITIVE MATERIALS

In combination with the cyclone suction unit, the Ultra Centrifugal Mill ZM 300 mill is even suitable for grinding light and heat-sensitive materials.

• Efficient cooling of sample and grinding tools
• Improved sample discharge from the grinding chamber
• Particularly suitable for large volumes
• The cyclone accommodates sample bottles of 0.25, 3 and 5 liters
• Ideal for cryogenic grinding

The ZM 300 is suitable for grinding a wide variety of materials:

waste, graphite, collagen, drugs, fertilizers, feed pellets, grains, spices, rubber, wood, coffee beans, bones, coal, food, corn, minerals, paper, plant parts, polymers, powder coatings, rice, seeds, straw, sweets, tobacco, textiles, chemical products, electronic components, dried fruits and vegetables, dried larvae, pharmaceutical products.

Functional Principle

The grinding process is carried out by impact and shearing forces between the rotor and the fixed ring sieve. The sample material is fed into the rotor via a funnel with splash protection, accelerated outwards by centrifugal force, and pre-ground by the wedge-shaped rotor teeth. The subsequent fine grinding takes place in the narrow gap between the rotor and the sieve.

Thanks to this two-stage process, sample preparation is particularly gentle and fast. Since the ground material only remains in the grinding chamber for a short time, the characteristic properties of the sample are retained. The end product is collected in the collection vessel, cyclone, or paper filter bag that surrounds the grinding chamber.