Pneumatic Drying System
Pneumatic dryers use hot air to dry the plastics flakes, much like a hair dryer. After dewatering, the plastics flakes are vacuumed out by a transport blower and mixed with hot air traveling through a long set of stainless steel tubing that winds back and forth. As the plastics flakes mix and spin around within this lengthy transport tunnel, moisture is effectively dehydrated. Ending with a cyclone separation apparatus where cool air is mixed in, residual moisture is further reduced. The cyclone separator is the last stand against any dust and fines within the material stream.
Depending on the capacity of the plastics bottle washing line, the use of one thermal heater is usually enough. However, to ensure the lowest possible moisture levels, some plastics washing plants may request the use of two or even three thermal spiral heaters that are positioned in a row.