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Thread: Coating Solution contain Precipitates

  1. #1
    OptiBoard Novice
    Join Date
    Aug 2018
    Lens Manufacturer

    Coating Solution contain Precipitates

    Hi! I'm currently give support to the coating department for their new 1.6 FSV lenses using the PPG 1.6 coating. We use SCL CD1000 machine.

    Lately we found many rejects (we called "blob"). The whole lens is full of this blob and it seems to stick on the surface. I believe that it came from the coating solution because when I check the coating solution, there are lots of coating precipitate. However, we still unable to trace on where it came from.
    During production, the first 4 hours it was ok. No rejects at all. But after that this reject appear suddenly. It cost 50% - 70% rejects per job sheet.

    Do you guys have any ideas where does the coating precipitate came from? We already made sure that the lens are clean (checked right before dipping into coating tank) and the ovens are clean also. Where the precipitate came from is worrying. Because it disturb the long-running production.


  2. #2
    OptiBoard Professional Mauro.Airoldi's Avatar
    Join Date
    May 2007
    Bologna Italy
    Lens Manufacturer
    I have a couple of CD1000 in my production department, if you put the enlarged photo of the defects, I can suggest its origin.
    What degree of filtration do you use for the coating? (the suggested 1-5 microns)
    the HC concentration (dry residue) is ok?
    after the first tanks with basic washing, do you have a tank with an acid ban to correct the superficial pH? (if not, after about twenty lens baskets you will begin to modify the pH of tank HC)
    I'm waiting for the photos to give you more suggestions.

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