NWDC
IM 26 MAR 2014 © 2014 Novatec, Inc. All Rights Reserved
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NWDC IM 26 MAR 2014
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SALES AND SERVICE
NOVATEC maintains qualified sales, engineering, and service personnel to assist in any
way possible. If you have any comments concerning the types of equipment which
NOVATEC manufactures that might improve your process, or any questions concerning
service, we urge you to contact us. Please have you Model and Serial Number handy.
Sales: 1-800-BEST-DRY
●1-800-237-8379 ● Fax: 410-789-4638 ● [email protected]
Technical Service Department: 1-800-938-6682
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SHIPPING AND INSPECTION
Although NOVATEC uses reputed carriers to deliver products, it has no control over the
products once it leaves the manufacturing facility. Upon receiving the products, thoroughly
inspect all equipment inside and out for damage that may have occurred during shipment.
If any damage is found, a claim should be filed immediately with your carrier.
NOVATEC thoroughly tests and inspects all products before shipment. You are to make
the piping, and electrical connections for final installation and commissioning. If there any
problems, shut down the equipment and contact the NOVATEC Technical Service
Department.
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PRINCIPLE OF OPERATION
The NWDC Series is designed to convey moisture laden resin from a source container,
dry it, and deliver it to the throat of a process machine.
5.1 Resin Drying
The NWDC NovaWheel Series dryer was engineered and designed to effectively remove
moisture (in the vapor state) from hygroscopic plastic resins. This process is accomplished
by the continuously rotating desiccant wheel and the three air streams (Process, Purge and
Regeneration). The Process return air is exposed to an adsorbing media (desiccant wheel)
in a sealed air stream, where the desiccant adsorbs the moisture from process air. After the
desiccant has adsorbed the moisture, it is exposed to a Regeneration air stream which has
been pre-heated to a temperature of about 380°F. (190°C). This causes the moisture to be
driven out from the desiccant and prepares it for more moisture adsorption. Now the
desiccant media passes through third air stream called purge air stream. Here the
desiccant media is cooled down by some of the process air before entering back into the
process to provide for better performance. The three air streams (process, regeneration
and purge) are separated by special Teflon fabric coated silicon seals. The process air and
regeneration air is compressed by using regenerative blowers.
The dry air from the dryer is then heated to the desired drying temperature by an electric
heater located in the NWDC cabinet. The hot dry air enters the hopper at the bottom and
removes moisture vapor from the resin in the hopper. The air from the top of the hopper is
returned to the dryer, where it is filtered, passed through the desiccant wheel to remove
moisture from the air stream and cooled before the process blower sends the air back
through the heater and into the bottom of the hopper again in a continuous process.
