There are a increasing number of pellet mill manufactures, generating both small as well as large scale pellet mills to process various 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, though all work on the principle of a roller and 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 construction market, the industrial along with 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 along with roller wear as well as increased fuel consumption compared to other designs. The principle of the accelerated roller along with die wear comes from the fact the the contact point between the die as well as roller on the inner in addition to outer edge are turning at different speeds. Therefore this will generate a slipping action through the difference in speed, leading to increased roller and die wear. On the other hand this fact maybe true, there are some important points to consider compared to sphere die designs. Generally flat die pellet mills are cheaper to produce along with so are the consumable parts. One of the key reasons is the die requires heat treatment to enlarge life. Though circle dies can buckle under temperature treatment, mounting construction costs. Also it has been found that processing some low density raw materials it very hard with sphere die pellet mills compared to flat die pellet mills. Therefore on the other hand flat die pellet mills may have their faults, it is not probable to discount flat die pellet mills altogether. For large scale industrial manufacturers, the common design now is the ring die pellet mill. Some manufactures of circle die pellet mills include CPM, Bliss plus Comact. The sphere die pellet mill has a circle formed die by means of either 3 or maybe 3 rollers applying compression to the inner surface of the sphere. Matter is entered into the centre of the ring, along with compressed owing to the die to the outside of the disc. As the roller plus die are turning at the same speed across the surface of the die, lower roller plus die wear is expected and also reduced energy consumption per ton of pellets. Ring die pellet mills yet a very large and very heavy, therefore they are only really practical form large scale pellet construction plants.
Read more about Portable Pellet Mill
There is a fairly new design of pellet mills that has two rotating dies, the only production of this design of pellet mill currently is Pellet Systems International PSi. The two dies run next to each other similar to two rotating cogs. As material enters between the two dies, the matter is compressed due to each die, and comes out in the centre of each die sphere. Again energy consumption is stated to be lower.
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