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Hammer Mill Demonstration

The Hosokawa Mikro Pulverizer® Hammer and Screen Mill is one of the most versatile and durable systems for fine size reduction down to D 97 < 45 µm. This brief video demonstration will highlight the features and operation of the Hosokawa 100 HP hammer mill (MP #4) which is used for specialty chemical applications. The Mikro Pulverizer Hammer and Screen Mills range from 1 HP up to 350 HP.


The Hammer and Screen Mill is a high-speed mechanical impact mill designed for continuous size reduction of a wide range of materials for chemical, pharmaceutical, food, mineral, and cosmetic applications. This device has evolved into the preeminent industrial mill with thousands of worldwide installations.


Design and Options:

  • Laboratory (1 HP) to production (200 HP) available
  • Process 250 gram batches up to 15 tons/hour
  • Easy to operate and maintain
  • Available in mild steel, stainless steel, and wear protection
  • Pressure shock-resistant (PSR) models available
  • Various configurations available to produce a wide range of products and results
  • Durable and reliable designs
  • Compact and easy to clean
  • Cryogenic grinding

The Mikro Pulverizer consists of a high-speed rotor assembly fitted with hammers. The grinding chamber is fitted with a cover containing a multiple deflector liner and a retaining screen at the point of mill discharge.


A screw mechanism is often used to introduce feed material into the grinding chamber. The grinding process is affected by three basic variables: the type of hammers, the rotor speed, and the size and shape of the screen opening.


There are two types of hammers: the “stirrup,” recommended where a fine particle size is desired; and the “bar,” which generates a coarser grind with a minimum of fines. Both types are tipped at the wearing edge with various abrasion-resistant alloys. Rotor speed affects the fineness of the grind as follows: low speeds result in a coarse grind and high speeds produce a fine grind. Size and shape of the retaining screen openings also affect the product. In general, a finer screen opening will result in a finer grind. The retaining screen does not function as a sifting screen, except in coarse granulations.


Controlled Particle Size
Optimum particle size reduction can greatly affect chemical reaction speeds, solubility, weight, color, volume, appearance, and strength of ground products. Mikro-Pulverizers® provide accuracy in particle size control because the grinding action is entirely mechanical. Once a mill is set to deliver a certain product, it will continue to produce exactly the same result without adjustment.


Grind, Blend, and Disperse

Mikro Pulverizers® grind, blend, and disperse in a single operation. Intensive action thoroughly mixes dissimilar ingredients into a finished product. Heat-sensitive materials are handled by adjustment of mill speed, hammers, screen and discharge air relief, as well as with pneumatic conveying. Conditioned air may be bled into a grinding chamber, or the feed may be pre-conditioned or chilled.
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