User Guide

This system is a closed loop, because ambient (outside) air is never introduced into the process

air. See Figure 1. 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. (see

Figure 1).

Figure 1: Air Flow Diagram.

Ambient

Regen

filter

Regen

bleed

Process air

heater

From

drying hopper

Process

filter

To drying

hopper

Upper valve

Desiccant

beds

Desiccant

beds

Regen heater

Lower valve

Regen blower Process blower

Specifying a Drying System

There were many variables 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, we can advise you on necessary equipment, process time and temperature

modifications.

What is Desiccant?

Desiccant is a material that attracts and holds (absorbs) water from the air. The desiccant our

dryers use is a synthetic crystalline metal aluminosilicate that is blended with a clay binder and

formed into beads.

General Information 14