Briquettes press takes leftover and offcut from logging and lumbering as raw material to make charcoal briquettes, also included agro waste such as straw and stalks. Mechanically, raw material will be sequeezed together due to the cohesiveness of its own, forming briquettes, either in square, round and hex shape. Charcoal can be made from anoxic briquettes during insufficient combustion and dry distillation in charcoal stove or carbonizing furnace. 

You may have sawdust, saw shavings, bamboo, barks, cotton stalks, walnut shell, chestnut shell, sesame stalks, corn talks and cobs, soybean stalks, sunflower stalks, rice husk, bagasse and so forth. Those are all able to be processed into charcoal briquettes. However, material with the size above 6 mm shall be crushed, but rice husk and sawdust may not be pulverized. Prior to being briquetted, raw material possesses bulk density of about 60-350 kg/m3 while it will increase to 1100-1400 kg/m3, an increase of even ten folds. The uniformly extruded fuel features high thermal value and stable combustion. Not only the combusting time is prolonged by 30%-40%, but fewer greenhouse gas emissions and less smoke will be realized. 

Charcoal does possess a high thermal value of 7000-8500 Kcal. One kg of charcoal is capable of combusting more than 3 hours. Due to the higher content of carbon about 70%-80%, charcoal features smokeless and bland smell, quite environment-friendly. In stark contrast, original charcoal, namely the direct wood-turned-into-charcoal holds thermal value of 5000-6500 Kcal, but the combustion time can just last about 1 or 1 and a half hours, with pungent smell discharged. 

Straw, featuring a lower thermal value, is suggested being used to make briquettes rather than to make charcoal. Straw briquettes are more extensively applied and sawdust charcoal is more popular. Anyway, they both have their own edges.