Challenge
PVC powder is thermoplastic. The high inlet moisture (25%) and low target (1%) demand deep dewatering while keeping the temperature out of the melting range that causes wall sticking and caking.
Solution
Flash airflow drying with dwell in seconds removed most of the water in the constant-rate stage. Inlet temperature and air volume were tuned at the trial run to stay clear of the wall-sticking range, with matched dust collection.
Result
Final moisture reached about 1%, throughput held steady at about 800 kg/h, and there was no wall sticking or caking.
Equipment in this case
Flash Airflow Dryer
Capacity varies with operating conditions and is confirmed by a trial run; parameters fixed by machine size, such as air volume, can be stated precisely.
Related questions
Flash airflow dryer or rotary dryer: which one?
The two have different structures and suit different duties:
Flash airflow dryer
It dewaters through brief contact between high-temperature air and the material. Drying is fast, which suits inorganic salts and chemical powders that need rapid dewatering. Sizes are Φ220, Φ280, Φ325, Φ400, Φ500 and Φ600.
Rotary dryer
The rotating drum tumbles the material for more even heating. It suits sawdust, plastic pellets and flake materials that do not break up while tumbling.
How to decide
Look at the material form and whether it is sticky. Powders and fast-dewatering duties point to flash airflow; granular or flake materials needing even heating point to rotary. The moisture content and target final moisture still have to be considered.
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