There are a growing number of pellet mill manufactures, generating both small and large scale pellet mills to process a variety of raw materials from animal feed to animal bedding. For industrial applications there are a few key pellet mill manufactures. The designs of the pellet mills do differ, however all work on the principle of a roller as well as die compression principle along with high temperature wood pellet construction, here are a few of the manufacturers.
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However China still produces large quantities of flat die pellet mills for the small pellet manufacture market, the industrial plus western market has now majority left flat die pellet mill design. The flat die pellet mill is the oldest design of pellet mill. The only western manufacturer generating flat die pellet mills is Kahl in Germany. One of the main reasons many manufactures have moved away from flat die pellet mills designs is due to concern over excessive die as well as roller wear as well as increased fuel consumption compared to other designs. The principle of the accelerated roller and die wear comes from the fact the the contact point between the die in addition to roller on the inner in addition to outer edge are turning at unlike speeds. Therefore this will generate a slipping action owing to the difference in speed, leading to increased roller plus die wear. However this fact maybe true, there are some important points to consider compared to sphere die designs. Generally flat die pellet mills are cheaper to create in addition to so are the consumable parts. One of the key reasons is the die requires temperature treatment to increase life. However circle dies can buckle under temperature treatment, rising manufacture costs. Also it has been found that processing some low density raw materials it very hard by circle die pellet mills compared to flat die pellet mills. Therefore however flat die pellet mills may have their faults, it is not possible to discount flat die pellet mills altogether. For large scale industrial manufacturers, the common design now is the sphere die pellet mill. Some manufactures of sphere die pellet mills include CPM, Bliss along with Comact. The disc die pellet mill has a sphere shaped die by means of either 3 or maybe 3 rollers applying compression to the inner surface of the ring. Material is entered into the centre of the sphere, as well as compressed through the die to the outside of the disc. As the roller in addition to die are turning at the same speed across the surface of the die, lower roller in addition to die wear is expected as well as also reduced fuel consumption per ton of pellets. Disc die pellet mills however a very large along with very heavy, therefore they are only really practical form large scale pellet construction plants.
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There is a fairly new design of pellet mills that has two rotating dies, the only construction of this design of pellet mill at this time is Pellet Systems International PSi. The two dies run next to each other similar to two rotating cogs. As matter enters between the two dies, the material is compressed through each die, and comes out in the centre of each die ring. Again energy consumption is stated to be lower.
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