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Pellet presses are one term used to describe a pellet mill or pellet machine. Pellet presses come in various different sizes ranging from a small home press such as the Mini Pellet Mill up to large scale equipment such as the Modular Pellet Plant. There are several different designs of pellet press including the flat die pellet press and the ring die pellet press. The Flat Die Pellet Press Design Disadvantages
The flat die pellet press was the first design,
and it is the simplest design of pellet press. The majority of small
pellet presses are based on the flat die design and they are
manufactured in China. The advantage of the design are that they are
very simple to produce and also very cheap to produce. However in
terms of pellet quality and control of the process the majority of
flat die pellet press are lacking. Also the relationship between the
rollers and die causes a skipping action. This skipping action means
increased wear on consumables such as the roller and die and
bearings. Skipping also generates increased friction which raises
energy consumption of the pellet mill. These factors together mean
that the flat die pellet press uses more energy to produce pellets. The Ring Die Pellet Press Design Advantages The flat die pellet press was developed at the turn of the 20th century, then around the 1950's the design was improved with the ring die. All pellet mills that PelHeat support are based on ring die pellet presses. The majority of pellet presses used in large scale commercial pellet manufacture use the ring die pellet press design. The main benefits been reduced electrical consumption and increased life of the main consumable parts such as the rollers and die. The Mini Pellet Mill is one of the very few small pellet presses to work on the ring die design. First material is entered into the hopper, the material needs to be in particles smaller than 6mm and have a moisture content below 15%. Material is fed through the hopper via an auger into a conditioner where water and vegetable oil can be added. The material is then metered into the pellet mill chamber. |
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