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MAPP Plastics Discussion Forum

The MAPP Plastic Industry Discussion Forum allows members to rapidly communicate with each other. Post both questions and answers to questions that other MAPP members have about any industry topic from material and process issues to R&E Tax Credits and other business issues.

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Posted:  18 Mar 2013 03:42
We are interested in dryer system integrity

How do you know if your dryers are working properly?

Wht type of system and procedures do you use  to insure both the dryers are working properly and that the  material is properly dried ?

Any thoughts you have would  be very helpful


Ron tobb
Posted:  18 Mar 2013 06:54
Ron, I sent out emails to about 5 plastics professionals on this issue and an hoping that somebody will be able to help.

Troy Nix
Posted:  18 Mar 2013 20:29
   To check moisture of dried materials, we recommend the purchase of a moisture analyzer.  There are several options in the market and a Google search will help guide you.  For example, we use a Sartorius Omnimark in our operation.  We utilize this for checking moisture content of materials at startup and in process at pre-determined points.  There are different methods used in the moisture analysis, so we encourage you to reach out to a few suppliers to understand the pro's and con's of various methods.
   To determine drier performance and integrity, you can consult with your machine supplier's preventive maintenance and calibration routines.  A quick consultation with your machine's manufacturer will help.  In general, you want to be sure the air flow lines are in good shape, that thermocouples are calibrated, and that desiccants are changed as needed.
   I hope this helps.  Good luck.

Shawn G.
Posted:  19 Mar 2013 16:46

Second the acquiisition of a moisture analyzer.  Also a Dew point meter, independent of the one on the dryer, for checking moisture of the air circulating through the system is a huge help.  The other suggestions above are all good.

Dan I
Posted:  20 Mar 2013 15:56
Below are some things that we do to ensure dryer/drying integrity. 
1. Proper PM program for the dryers to ensure that the heaters, blowers, filters, hoses, etc. are all in working condition (manufacturers have recommended schedules and procedures, that can be tailored to your needs).
2. Moisture analyzer to test the material before you begin your process.
Thanks, James M.
Posted:  20 Mar 2013 18:14   Last Edited By: Vention Medical
Agree with everyone above on the dryers. A moisture analyzer is key. Some resins can become super saturated(mainly nylons) and require more then the specified dry time even if the dryer is funtioning properly.  The only way to tell is with the analyzer or the negative effects on the process/part quality. This mainly happens when resin is left unopened on the shelves. We use the analyzer daily.

Posted:  25 Mar 2013 23:09
We used Omnimark III's as our only analyzer for many years.  About a year ago we upgraded to Karl Fisher titration analyzers.  They are deadly accurate because they measure moisture content directly.  Almost all others use loss on weight method based ona a predetermined model - not very accurate becaused they more than just water is evaperating out.  They are actually modeled using the Karl Fisher as the baseline.  They cost a lot more but it's worth it if you want better process control, less scrap, etc.

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