It seems that we are facing the same problem like in this thread:
http://www.optiboard.com/forums/showthread.php/42817-Coating-Problem?highlight=uv+coating
We coat the both sides of 1,5 material and after coating we can see some small semi - circles.
We were able to do both side coating without any problems in the past.
When we coat the transparent material or tinted stock lenses we have no problems, but when we coat tinted lenses by ourselves :
lens could be without any semi circles
lens could have small semi circles from one side - most frequent problems
lens could have small semi circles from both sides
The tinted lenses from our production has uniformly color without any defects.
According to attached thread, where is written that exchanging of wash nozzle had helped i tried to do not wash and dry lens - so the first operation was coating and second UV curing - but semi - circles were still visible.
Anyway, the lens after wash + dry operation is dried properly.
We changed air filters, lacquer filters, suction cups, complete new lacquer.
Coating pump is working properly, we are able to adjust the height of the lacquer and the lenses are cured well.
If you have any ideas i would be more than glad
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