It is a combination of sugar drying & cooling units. To ensure better convection drying of sugar, the hot drying air moves counter current to feed of sugar, while cooling air travels counter current to the discharging sugar. The hot air is introduced at the middle of drum. The drying & cooling air are withdrawn together through the dust collector.
The specially profiled sugar lifters fitted inside of periphery will lift the sugar & drops gently to cover entire section to form sugar curtains & the counter current air flow through these sugar curtains, ensures better heat transfer & moisture removal and also avoid caking of sugar. The drum is rotated at very slow speed to avoid abrasion to sugar crystals.