Extrusion granulation is a dry granulation process that uses pressure to agglomerate solid materials. When the solid materials are squeezed, the air between the powder particles is first removed to rearrange the particles to eliminate the gaps between the materials. When the brittle material is squeezed, part of the particles are crushed, and the fine powder fills the gaps between the particles. In this case, if the free chemical bonds on the newly generated surface can not be quickly saturated with atoms or molecules from the surrounding atmosphere, the newly generated surfaces will contact each other and form a strong recombination bond.

The double roller press granulator https://m.hqhifertilizermachine.com/products/ machine generally to be used by using the dry granulation method to finish the production process.
The rotary drum granulator machine that it is usually to use the wet granulation method to produce the fertilizer granulator.


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