Lignin is a non crystalline substance that is mainly insoluble in any solvent at room temperature and does not have a melting point, but has a softening point. When the temperature reaches a certain value, the softening and bonding force of lignin increases, and under a certain pressure, the cellulose molecular clusters are displaced, deformed, and extended. The adjacent biomass particles inside are interconnected and recombined to form compression.

The JDX series straw briquetting machine adopts the principle of the interaction between the extrusion force between the flat mold block and the pressing wheel, as well as the friction force of the mold hole, to achieve the formation of materials. The material does not require any additives or binders to be added during the processing. Straw and other materials contain a certain amount of cellulose and lignin, which are structural monomers in the material and are high molecular compounds of phenylpropane type. It has the function of enhancing cell walls and binding cellulose.