How it Works

Dry resin in 40 minutes, not 4 hours.

Simple physics explains the outstanding efficiency of vacuum drying. As air pressure drops, water boils or volatilizes at lower and lower temperatures. While water boils at 212° F (100° C) under normal sea-level atmospheric pressure of 29.92 inches (760 mm) of mercury, the boiling point falls to only 133° F (56° C) when pressure is reduced to 25 inches (635 mm). In practice the LPD Dryer heats most resins to temperatures in the range of 160 to 240° F (71 to 115° C) before drawing the vacuum. It takes about 20 minutes to raise the pellet temperature enough to exceed the reduced boiling point. The LPD dryer generates a very strong vacuum of up to 29 inches (737 mm) which does the real work, needing only about 20 minutes to reach required resin dryness.

Result: dry resin in 40 minutes!

How it works:

In normal operation, the dryer utilizes an indexing

carousel containing three material chambers, which

automatically rotate through 3 positions or stages:

STAGE 1: Resin is loaded into the vacuum chamber

and is heated by hot air for about 20 minutes.

STAGE 2: A second vacuum chamber containing

a batch already up to temperature is sealed at top

and bottom, a vacuum is drawn for 20 minutes, and

moisture is evacuated to ambient air.

STAGE 3: Dried resin in the third, sealed chamber

is pneumatically conveyed to the receiver mounted

on the processing machine.

On a 100 lb/hr (45 kg/hr) unit there is never more than

70 to 100 lb. (32 to 45kg) of material in the system,

which is 75 to 83% less than in a conventional dryer.

Even processors who fail to plan ahead are left with

a minimum amount of unused material.

With a little planning, it is possible to change colors

on-the-fly without wasting material or stopping

production.

For more information contact:

John Moennich

440-282-4032

For information on Maguire Blenders visit us on the web@ MaguireBlenders.com

Dry resin in 40 minutes, not 4 hours.

Last modified: May 18, 2004