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| News |
28.09.2015
Fine milling system is rendered explosion-proof
Frewitt, Granges-Paccot, Switzerland, points out that users of hammer mills find themselves on the front line of dust explosion prevention since powders need to be very finely milled at high RPMs. One of its customers, a manufacturer of drugs to treat coronary pathologies, vascular disorders as well as cancer, had previously milled its pharmaceutical active ingredients on the hammer mill of well-known Frewitt competitor. Owing to new requirements of safety and efficiency, the customer needed to modernise its operations, moving production of API formulations to a cleanroom; hence there was a requirement to procure a more sophisticated milling system.
The customer needed to mill a heat-sensitive product, achieve a particle size of 100µm, while ensuring a high throughput. Frewitt’s HammerWitt met these conditions. In order to prevent the formation of an ignitable mixture during the conveying, dosing, milling and filling processes, the process environment room had to be inerted. Here the calculation of the highest allowable oxygen level was paramount. In this case, it was 3%, and this level was programmed as the alarm threshold. If this were to be reached, the machine would stop in order to prevent a potential explosion. Only if the oxygen concentration returned under the non-critical threshold of 3% could the milling process be continued. www.frewitt.com
The milling housing of the Frewitt HammerWitt has been equipped with a water-cooled system and the temperature of the milling chamber as well as that of the drive bearings is constantly monitored.
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