Closed Loop Dryer

Modified on Monday, 02 February 2015 12:55 PM by mpieler — Categorized as: Extrusion Hints

Closed Loop Dryer
Vol. 26 #1, March 1999

When using a dehumidifying dryer to pre-dry moisture sensitive hygroscopic resins, the dehumidifying dryer’s airflow configuration should always be a closed loop. The reason for this is the dehumidifying dryer is sized to remove the relatively small amount of moisture present in the resin being dried, not the large amount of moisture present in the shop’s ambient air. Operating a dehumidifying dryer with single pass ambient air will quickly overload the dryer’s desiccant, reducing the dehumidifying dryer’s performance to that of an ordinary hot air dryer.

- Pete Stoughton, Conair

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