The thermodrum or Drier Cum Mixture unit is a long rotating cylindrical drum fabricated from an abrasive resistant 10 / 12 mm thick M.S. plate. It is mounted on a sturdy and robust steel structure fabricated from girders and channels. Four trunnion rollers running on heavy duty bearings support the drum. Three rollers mounted on thrust bearings support the guide ring, taking care of the downhill thrust produced due to the degree provided to the thermodrum.
This unit of the drum mix asphalt plant is the heart of the plant. As called the aggregate is headed with automatic burner to require temperature and hot bitumen is added in the drum at suitable stage and bitumen is coated evenly to the aggregate in this drum. There are stages in the drum like preheating, heating , mixing Zone. That helps the aggregate and bitumen to heat and mix uniformly. The fins in the dryer unit are specially designed to get maximum heat efficiency that is to say minimum heat loss.