Originally Posted by
HsvToolFool
"The pure, raw material (sawdust) is then pulverized with hammer mills and dried. The dried material is then processed under heat and pressure. Lignin, which is the natural glue which holds plant fiber together, softens above 100 degrees Celsius, permitting the material to change shape. The hot lignin then acts like a glue to bond the pellet together. Pelleting employs a hard steel die which rotates against rollers forcing the material through the die with pressures of over 10,000 PSI. As the pellet is forced through the die it is sheared off at the specified length, cooled, screened, and bagged."