We are having problems with getting full cure on different part shapes and masses and we cannot seem to get the oven properly adjusted to stop having under-cured parts.
We are evaluating the use of nylon 6 as a replacement for nylon 11 and 12 powder coatings. In the course of our work we are experiencing a great deal of pinholing on the test panels.
We find that we lose anywhere from 5–8% of the oven’s air volume depending on plant conditions (shipping doors opening and closing, etc.). We have air return soft seal ducting from the part openings back to the burner box (roof-mounted) and have also tried a hard seal, but the hard seal made things worse.