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Mikro Pulverizer® Hammer Mills for Toll Processing

Made In The USA

Mikro Pulverizer® Hammer Mills for Toll Processing

Made In The USA


Hammer mills are one of the most economical impact milling systems available. Hosokawa’s Mikro Pulverizer Hammer and Screen Mill is designed to mill soft to medium hard chemicals, minerals and plastics down to D90 < 45 µm. The systems can be coupled with a liquid nitrogen cooling tunnel for cryogenic or temperature controlled applications. The hammer mill uses an internal screen mounted below the grinding rotor to control particle top size. If finer or narrower particle size distributions are desired, an external dynamic classifier can be installed downstream from the mill to separate the coarse fraction or return oversize materials to the hammer mill.

Typical size reduction results on the Mikro Pulverizer:

  • Gypsum: 250 µm feed material – milled down to D90 < 65 µm
  • Acrylic powder: 3/4” top size to 97% < 1 mm
  • Rubber: 8 mm top size to D99: 500 µm
Hosokawa has four Mikro Pulverizer Hammer and Screen Mill systems available for toll processing chemical and mineral materials. MP #1 mills are capable of grinding up to 600 lbs/hour and the MP #2 mills are capable of grinding up to 1,200 lbs/hour. All Hosokawa hammer mills have multiple rotor and screen configurations to maximize production rate and optimize production results. There are basically three types of hammer designs - the stirrup or LFS hammer, the swing bar hammer, and the rigid bar hammer. The stirrup hammer has the most surface area and is used at high speeds to produce the finest particle sizes. The swing bar hammer is used on materials that do not respond well to impact. Fibrous materials that need to be cut or shredded work well with these hammers. The rigid bar hammer is used for granular and coarser size reduction applications and for producing narrower particle size distributions when a minimal amount of fines generation is desired.

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