The biggest difference of these two types of ring die pelleting mills is the working principle:
 

The vertical ring die pellet mill is specially designed to press the material which is hard to be bonded and shaped. The material can be loaded into the pelleting chamber in its own weight. Then, under the strong pressure between the rotating roller and the ring die, the material enters into the die holes to be formed into pellets. And this vertical ring die pellet mill is called light-weight material pellet mill as well. Because this vertical ring die pellet mill is more suitable for managing the materials with light weight, such as, rice hull, grass with light weight, straw, melon and fruit hull and the material which is not easy to form.
 

Differ from the vertical ring die pellet mill, the horizontal ring die pellet mill adopts the feeding auger to feed the material into the pelleting chamber through the stock bin. The material begin to be soft in the sealed pelleting chamber, and under the great extrusion between rotating ring die in a high speed and the roller, the soft material is pressed into the holes uniformly distributed on the die. After that, the formed cylindrical solid body out of the holes will be cut by the knife, thus discharged through the export hole.