;Audible/visual critical alarm.
;Fusing for blowers and heaters.
;Dirty Filter indicator for each individual blower.
2-6 The Closed Loop Drying System
Dehumidifying dryers force hot, dry air through the resin in the drying hopper where the air picks up moisture from the material and is drawn back to the dryer.
In the dryer, a desiccant bed strips moisture from the air. The dryer then
This system is a closed loop, because ambient (outside) air is never introduced into the process air. See Figure 2. Our dehumidifying dryers use the closed loop system, because the process air is typically much drier than ambient air, even after carrying moisture out of the plastic resin.
Recycling process air maintains drying efficiency at a consistently high level.
Figure 1-Dryer Air Flow Diagram
Ambient |
|
| From |
|
| drying hopper | |
Regen |
|
| Process |
filter | Regen | Process air | filter |
| bleed | heater | To drying |
|
| ||
|
|
| hopper |
| Upper valve |
|
|
Desiccant | Desiccant |
beds | beds |
Regen heater | Regen heater |
Lower valve
Regen blower | Process blower |
Cabinet Series Dehumidifying Dryer | 12 |
