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Pellet Mills are the main term used to describe the machines used for pellet compression. There are many different designs of pellet mill, each with their own advantages and disadvantages. The two main designs are the flat die pellet mill and the ring die pellet mill. The Flat Die Pellet Mill Design Disadvantages
The first design of pellet mill to be used was
the flat die pellet mill, developed at the start of the 20th century
to process animal feeds. This design of pellet mill was based on a
vertical design, where material fell onto a roller section sat on
the surface of a horizontally mounted die. Material was then
compressed through the die, and pellets fell from the bottom of the
die. One of the main disadvantages of this design are that the
rollers are covering different distances over the inner and outer
edges of the die. This then causes the rollers to constantly skip.
This skipping action causes increased wear, and reduces the life of
the rollers and die. The Ring Die Pellet Mill Design Advantages Practically all small pellet mill sold today are produced in China and work on the flat die pellet mill design. However the PelHeat pellet mills, even the Mini Pellet Mill you can see to the right all work on the ring die pellet mill design. Most large scale commercial pellet production operations use the same ring die pellet mill design. Both the rollers and the die operate on the vertical axis, and therefore the inner and outer edges of the rollers cover the same distance across the surface of the die. Therefore no skipping occurs, which means the life of the rollers and die are considerable longer. What it also means is the Mini Pellet Mill can be designed to run from a domestic power supply due to the reduced energy consumption of the ring die. Due to its superior design the Mini Pellet Mill can be used to produce wood pellets from only a 2.2kW single phase motor. The Mini Pellet Mill is the most advanced small pellet mill. |
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