Spiral Jet Mill
Alpine Aeroplex AS – Spiral Jet Mill
The grinding air is blown in tangentially at the nozzle ring via Laval nozzles. This creates the spiral flow in the grinding chamber, from which the mill takes its name. Due to the spirally circulating flow, a high pressure builds up in the mill, which can rise to 1 bar overpressure during operation without material to be ground. The attached injector, operated with compressed air, ensures that the material to be ground is fed against the overpressure in the machine. However, this involves a considerable consumption of compressed air, which can amount to up to 30% of the consumption of grinding air.
The simple geometry of the mill components enables good cleaning and, if necessary, sterilization of the entire mill.
- Spiral jet mill for fine comminution of soft materials (approximately up to a Mohs hardness of 3) with brittle crystalline fracture behavior in the fineness range of 10 – 150 µm
- Designed as a flat-cylindrical grinding chamber without rotating components
- Upper part detachable or hinged
Possible Applications
For fine grinding of dry substances with a crystalline structure up to a Mohs hardness of 3.
Alpine jet mills are mainly used for high-quality pharmaceuticals , such as antibiotics or fine chemicals , where high demands are placed on the purity and fineness of the products.
With a max. input grain size of approx. 1.5 mm, end products with fineness d 97 in the range of approx. 5 – 30 µm are usually required.
The Aeroplex Spiral-Jet Mill AS does not use any rotating components: accordingly, the spiral jet mill has no bearings and shaft seals, and no lubricants are used . Contamination of the product from such sources is therefore not possible.
