Biomass pellet machine can compress biomass materials
What is the corresponding relationship of the compression ratio between the material and the mold?
Faced with this problem, we need to find a reference standard. We can use the bulk density of the material as the standard. The bulk density of the material is the specific gravity of the material. The specific gravity of the material depends on the lignin content in the material. Lignin has a heavier specific gravity. The specific gravity of the material means that the lignin content is high. Because lignin is sticky, we can use a relatively small compression ratio for extrusion. This standard is that the greater the material bulk density, the smaller the corresponding compression ratio. However, materials with high sugar and oil content should be excluded.
Let’s take an example to look at the compression ratio of materials.
Materials with relatively heavy specific gravity such as mahogany and jujube wood, that is, relatively high lignin content, are easy to mold. We probably use a compression ratio of 1:3.5.
Pine and poplar wood have moderate specific gravity, and a compression ratio of about 1:5
Pinus sylvestris is a relatively light material with low lignin content, which requires a large compression ratio of about 1:8.7
