Throughputs up to 200 lb./hr.
Vacuum Dryers do not utilize desiccant and there is no dew point reference for the process air. Instead, they use a very strong vacuum to draw moisture away from warm pellets.
Vacuum dryers use a multi-stage process. Plastic pellets are contained in a stainless steel sealed vessel that rotates between three stations, staying in each position for about 20 minutes. At the first station, the vessel is filled with pellets and they are heated to allow the molecular release of moisture. In the second station, they are repeatedly subjected to a strong vacuum, to draw away the moisture.
The dried pellets are discharged at the third station. This simplified process affords users fast drying with less energy consumption than most alternatives. The process is, by nature, a batch process so the material is loaded, processed, then dumped, and the cycle repeats.