NWB-DC IM 3 JAN 2014
© 2014 Novatec, Inc. All Rights Reserved
Page 13
NWB-DC IM 3 JAN 2014
9.0 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
10.0 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.
11.0 PRINCIPLE OF OPERATION
The NWB-DC Series is designed to convey moisture laden resin from a source container, dry it,
and deliver it to the throat of a process machine.
11.1 Resin Drying
The NWB-DC 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 NWB-DC 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.