We pre-dry all of our materials in a separate area

From Bob S...Automotive parts molder from Northern Ohio

 

Question:

 

We pre-dry all of our materials in a separate area out back and seem to have different molding problems throughout the year.  Sometimes things run perfect for long periods of time, and then for no apparent reason, we start getting streaks, bubbles and other problems.  What gives?

 

Answer:


There are several possible reasons for the problems you are having. It could be that the problems are related to the condition of your incoming material.  In colder and dryer times of the year, when the air outside is dry, the material is already fairly dry. But, when the weather is humid, the material is more humid and your dryer must work harder to remove its accumulated moisture [see drying parameters]. An older, or outmoded dryer will have a more difficult time providing uniform drying results.  Check how old your desiccant is and replace it if it is more than 2 years old.  Make sure all heaters are operating at full capacity and, of course, the blowers of your dryer must be operating correctly. Make sure the process and regeneration filters are clean because dirty filters can reduce the airflow, which has a direct effect on the efficiency of the dryer.

 

Jeff Rodway...Service Manager, Novatec, Inc.