Pin mill for cryogenic ultrafine grinding

Processors of heat sensitive products now have the option for cryogenic ultra-fine grinding with a milling system incorporating the proven capabilities of a contra-rotating pin mill

Processors of heat sensitive products such as polymers, caoutchouc, elastomers, pharmaceutical products and foodstuffs now have the option for cryogenic ultra-fine grinding with a milling system incorporating the proven capabilities of the Alpine Contraplex 160 C, a contra-rotating pin mill, available from Hosokawa Micron.

The mill is operated using liquid nitrogen, which causes the feed material to become brittle.

The specific precrushing energy is reduced meaning that the mill achieves high levels of grinding performance.

Additionally the cryogenic mode prevents grinding losses and thermal damage to the feed material that would otherwise be caused by the volatisation or overheating of constituent ingredients.

The inert gas atmosphere provides a high degree of safety when grinding flammable and potentially explosive products.

The design of the Alpine Contraplex 160 C prevents product deposits and ensures trouble free continuous grinding even if the product is sticky.

The speed of the pin disc on the housing side of the Alpine 160 C is 16,500 rpm, with the speed of the pin disc on the door side 12,000 rpm, giving a relative circumferential speed of 240 m/s.

The mill operates over a temperature range down to -80C at the mill exit.

Dependent on the product, the Alpine160 C achieves a throughput capacity of between 5 and 150 kg/h with a fineness range between 20 and 80 microns.

As an option the mill can be operated with air and without liquid nitrogen.

The range of the contra-rotating Contraplex Pin Mills includes machine sizes from 160C to 1120CW that are suitable for a wide variety of different products.

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