Hi Steve
(10-30-2008, 11:51 PM)steve Wrote: Thanks for the advice. I'm addressing housekeeping issues at the moment. Poor ventilation is probably a factor. Could you please explain "fines" and their origin -is it a powder quality issue?
Most powders will contain some degree of "fines" the very fine particulates that end up not being completely removed during grading. A powder may be described as being say -105 +45 microns typical size range, unfortunately, that does not ensure it will not contain a certain level of much finer particles. If it is a powder problem, then changing supplier/manufacturer or powder batch may help.
As Girish commented "fines" can also be generated within the process. The more you can do to avoid producing and then including this unwanted material on or in the coating the better.
Certainly improving your house keeping and ventilation will bring big benefits generally, even if it does not completely solve this specific problem, it will be worth doing anyway