Spiral Flow Jet Mill
Spiral Flow Jet Mills are a type of air microniser appropriate for grinding softer materials, producing product generally in the range of 1 to 20 microns and containing significant quantities of ultrafine particles. With the absence of any moving parts, the principal applications lie in the field of pharmaceuticals and allied products as well as speciality chemicals, where sterile and contamination-free operation is essential.
Features
• Products range from 1 - 20 microns with wide size distribution.
• Low operating temperatures enable heat sensitive and low melting point materials to be processed.
• Suitable for sterile operations and contamination-free processing.
• Coating and blending during grinding operation.
• Simple construction allows easy clean down.
• No moving parts.
• Alternative top or bottom discharge arrangement.
• Manufactured in mild steel or stainless steel.
• Replaceable internal jet rings and liners in PTFE, ceramics or other specialised material.
Operating Principals
• Compressed air is discharged into the shallow cylindrical grinding chamber from nozzles regularly spaced around the chamber (1).
• Air emerges in the form of high energy jets generating a high speed free vortex within the grinding chamber.
• Material is fed into the grinding chamber through a Venturi feeder (2) and is introduced by aid of compressed air (3) into the vortex formed by the air jets.
• High velocity gradients are set up on the particles within the vortex at the periphery of the chamber resulting in intense impact / attrition grinding.
• The free vortex directed inwardly towards the centre outlet results in classification of the material.
• Fine particles below the vortex cut size are drawn to the central discharge for collection in the external product collection system (4).
• Particles above cut size are retained in the grinding area until size reduction is complete.
