The aperture range of the pellet mill die used for wood pellet material is between 5.0-18.0mm, and the length-aperture ratio, or compression ratio, is between 1:4-1:10.
The compression ratio of the ring die for the wood pellet machine is determined according to the raw material. The compression ratio of different raw materials is different, the harder raw materials ,the smaller compression ratio ; the fluffier raw materials,the bigger compression ratio .That is to say, the fluffier raw materials are more easy to press and form shape, the fluffier raw materials contain more fiber, containing more fiber material is easy to form shape.