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Poor Material Dr ying
Troubleshooting
Occasionally, processing problems that are suspected of being caused by poor
drying are eventually determined to be the result of other issues in the process
setup. The intent of the information provided here is to assist you in determining if
your drying system is performing properly. However, the only way to know
definitely if your material is properly dried is to perform moisture analysis of
small samples as it leaves the bottom of the hopper, or just as it enters the process.
Conair does not sell moisture-analyzing equipment, but there are many brands of
this equipment available on the market.
You should also be aware that some processing problems may actually be the
result of over-drying material. Most materials will degrade to some extent if they
are exposed to their specified drying temperature for a time significantly longer
than the residence time specified by the supplier. If you want to maintain its dry-
ness, it is recommended that you reduce the process air temperature.
A majority of customer questions to Conair are related to dew point. It is important
to realize that dew point is one of
four
requirements that need to be satisfied.
There are four requirements, listed in order of importance, necessary to
properly dry hygroscopic plastic resins:
1
Drying temperature
of the air entering the hopper must be at the proper
drying temperature for your material, as specified by your material supplier.
2
Residence time
is the time, determined by your material supplier, that the
material in use must be heated to achieve proper drying temperature.
3
Airflow
during the process drying circuit must be adequate to carry and
distribute the heat throughout the entire bed of material inside the hopper.
4
Dew point
of the process air must be low so it can efficiently collect the
moisture as it is released from the heated material and carry it to the dryer to
be removed in the desiccant.
NOTE:
Concerns with drying
temperature may require
review of HTC or GasTrac
controls.
✐
Summary of Contents for Carousel Plus UGD043-1216
Page 7: ...Table of Contents l v...
Page 8: ...vi l Table of Contents...
Page 48: ...3 24 l Installation Testing...
Page 54: ...4 6 l Operation Control Function Flow Charts continued Login Flow Chart...
Page 55: ...4 O p e r a t i o n Operation l 4 7 Operation Basic Controls...
Page 56: ...4 8 l Operation Control Function Flow Charts continued Operation Flow Chart 1 continued...
Page 58: ...4 10 l Operation...
Page 59: ...Operation Dew Point Package Controls 4 O p e r a t i o n Operation l 4 11...
Page 60: ...Control Function Flow Charts continued Operation Flow Chart 1 4 12 l Operation...
Page 62: ...4 14 l Operation...
Page 63: ...4 O p e r a t i o n Operation l 4 15 Operation Setup Control...
Page 64: ...4 16 l Operation Control Function Flow Charts continued continued Setup Flow Chart 1...
Page 66: ...4 18 l Operation continued Control Function Flow Charts continued Equipment Setup Flow Chart 2...
Page 164: ...6 46 l Troubleshooting...