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Pin Mill vs. Hammer Mill: A Contrast and Comparison

There is a variety of different grinding mills on the market for various industries that process materials into fine powders. However, the two most common types of machines that are used in the industry are the hammer mill and pin mill. Both mills have their own unique features and characteristics that make them great. To help you better understand these two distinct mills, we will learn about each mill.


At Classifier Milling Systems, we believe it is important you understand the difference between our hammer mill and pin our mill!


Hammer Mill

  • One of the oldest and widely used grinding mill, it consists of four or more hammers attached on a central shaft and enclosed with a metal casing.
  • It performs particle size reduction via high speed rotating impact made by the rectangular pieces of ganged hammer which are usually made of hardened steel.
  • The material is crushed in three actions, primarily by the repeated hammer impacts, collisions with the grinding chamber wall, and particle-to-particle impact.
  • There is a screen at the bottom of the hammer mills for retaining coarse particles while letting through final sized product. Targeted particle size is being controlled by different factors, including rotors speed or velocity, feed rate, hit resistance, clearance between grinding plates and the hammers, and size of screen.


Pin Mill

  • Unlike the hammer, a pin mill consists of a series of pin breakers, that are hinged to discs in the grinding head to produce high energy impact.
  • The mill breaks up cellular materials without damaging its starch granules through the two horizontal steel plates on opposing directions and arranged in concentric circles.
  • It operates similarly to the hammer by shearing and impact, however, with a faster tip speed of intermeshing pins. Centrifugal force brings the finer product to the periphery for collection or further processing.
  • The milling process produces particles in the micronized size between 10 microns. The final size generated by the mill is due to several factors such as rotor tip speed, gas flow rate, feed rate of the material as well as its properties.
  • The entire milling process can be improved by reducing both air flow and solid feed rate, and increasing rotor speed.


Whether your unique fine grinding operations needs a hammer mill or a pin mill, at Classifier Milling Systems we offer the highest quality grinding mills and air swept classifier mills. Using any of our mills brings great returns to your business. Call or email our expert professionals today to get the conversation about grinding mills started!

Which one would be better for food processing??
Posted by: Sanjay | December 6, 2018, 3:56 pm
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