AEC WD 350 through WD3000 Dehumidifying Dryers - Manual (Page 13)

During regeneration, the dryer system heats air and forces it through the desiccant bed. The
moisture driven off the bed bleeds to the atmosphere.
If you measure the temperature of the air bled to the atmosphere (bleed temperature), you should
observe a rise after a period of time. This condition, called bed breakthrough, indicates that the
bed is dry. At bed breakthrough, the bleed air temperature peaks at approximately 400°F
(204ºC).
1-9 Specifying a Drying System
Many variables were considered in the selection of your drying system, including type of
materials, residence time, throughput of the extruder or injection molding machine,
ambient air moisture and temperature, and the altitude at the processing site. Should your
operating environment change, AEC/Whitlock can advise you on necessary equipment and
process time and temperature modifications required for your system.
Page 12 WDMR and WDFR Series Dehumidifying Dryers