What is the reason of glossy appearance of Biomass pellets?

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Bemgba B. Nyakuma Popular answer

Dear R. Khafaga,

The glossy appearance of biomass pellets is due to lignin. The high pressure process of pelletization partially "melts" lignin which not only helps to bind the pellets but creates the shiny or glossy appearance.

I hope this helps.

Best regards,

BBN

Bemgba B. Nyakuma

Paulo Fernando Trugilho

I agree partially with Dr. Nyakuma, but it is the temperature that leaves the lignin more fluid (glass transition point). The friction of the particles with the pelletizing matrix increases the temperature.