Pin Mill

Pin Mill

A simple, inexpensive means of grinding, sizing, de-agglomerating and/or homogenizing. Ideal for a broad range of food, chemical, pharmaceutical, nutraceutical, mineral and agricultural products including pulverizing of insects, eggs and larvae in flour applications in tight size ranges from coarse to 400 mesh.

The pin mill is also categorized as a disc mill is a kind of milling equipment that can break up cellular materials selectively without damaging the starch granules. It consists of two horizontal steel plates with vertical projections arranged in concentric circles on opposing faces and becomes more closely spaced towards the periphery. Wahal Engineer’s Pin Mill reduces bulk materials into narrow particle size ranges without the need for screens, hammers, knives or rolls.

They uses a series of pin breakers attached to discs instead of hammer in the rotating grinding head to achieve high energy impact between the mill and the particles.  It is traditionally employed to disintegrate starch- protein bond that exist in the material and produce fine flour.


The particle size produced by pin mill is determined by the following factors

  • Distribution of the pins
  • Physical properties of the fed material
  • Rotor tip speed
  • Material’s (solid’s) feed rate
  • Gas flow rate through the mills

Working Principle

The grinding action of the Pin Mill is achieved by impacting the product particles with a series of hardened steel pins. The material to be ground is pneumatically or mechanically conveyed from the hopper to a Pin Rotor where the break-up of the material occurs. The product enters through the eye of the machine and then passes through rows of pins rotating at high speed between stationary pins. The product particles are shattered into fragments as they progress towards the outlet. This action creates a fan effect and a high volume of air is drawn through with the product, keeping it cool. The machine’s grinding action can be controlled by altering the feed rate to the machine and the speed of the rotor.

Advantages of Pin Mill

  • It achieves smaller particle size than hammer mill at relatively reasonable energy consumption.
  • Recent advances have improved heat removal from the mill using cryogenic conditions.
  • Pin mill occupies little floor space.
  • It has a wide range of applications; can be used in milling dry, moist or slurry materials.
  • Low Energy consumption, high capacity and operating efficiency
  • Durability and long life
  • Noiseless working



Sector 64, Kundli, Sonipat, Haryana, India