Mikro® UMP Knife Mill

The Mikro® UMP Knife Mill is a compact, intermediate speed impact mill capable of producing granular and coarse to medium particle size distributions for Pharmaceutical and Food applications. The Mikro® UMP Knife Mill was developed to meet the Pharmaceutical and Food markets’ increasing demand for high performance milling technology. The design of this mill meets the requirements of the Pharmaceutical Industry for both product performance and cleanability. The mill design incorporates reduced internal surface areas, connection points, and acute internal surfaces for the ease of cleaning. The knife rotor is designed and manufactured in one piece to minimize surface areas where contamination can occur and to provide ease of cleaning. The mill design also incorporates a liner and screen assembly for particle size control. Various screen types are available to suit the application.

Design & Features:

  • For coarse granulation to medium fine size reduction
  • Lab & production models available from 1 HP to 40 HP
  • Capacity ranges from 5 lb. up to 4,000 lbs/hour
  • Designed for milling soft to medium-hard materials with a Moh’s hardness of 4 or less
  • Fabricated stainless steel construction
  • Finishes available to 0.6 micron Ra
  • Variable speed rotor drive
  • Cantilevered drive design for easy access & cleaning
  • Maintenance free, sealed for life bearings
  • Double lip seal protection with gas purge back up
  • Center & top feed options available
  • Gravity & pneumatic conveying discharge options
  • Cryogenic operation option
  • Containment design options available for isolator installations

The knives are designed with two impact surfaces; one side is provided with a flat surface for greater impact and the other side is provided with a knife edge for better shear or cutting force. The rotor is designed to be reversible on the drive shaft so that either impact surface can be selected for the specific application. The type of impact surface selected along with the rotor speed and size of the retaining screen will produce a wide range of granular to intermediate particle size distributions.

The fabricated grinding chamber is constructed in 316 stainless steel with a high quality 0.6 micron Ra surface finish. Higher quality finishes are available for specialty applications. The access door is hinged to the grinding chamber and is secured with a tri-clamp closure for easy and quick access for maintenance and inspection. The product feed inlet can be either through the mill door (CF design) or from the top of the main body (TF design). The bearing housing is a cantilevered design including maintenance free, sealed for life bearings. There are double lip seals and a gas purge between the drive and the process area to eliminate material contamination and premature wear of drive components.

  • Carmine/Cochineal
  • Diatomaceous Earth
  • Hydroxyethyl Cellulose
  • Hydroxypropyl Cellulose
  • Iron Oxide
  • Magnesium Aluminum Silicate
  • Polysorbate
  • Sodium Hydroxide
  • Titanium Dioxide
  • Zinc Stearate


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