Results 1 to 2 of 2

Thread: Coating Solution contain Precipitates

  1. #1
    OptiBoard Novice
    Join Date
    Aug 2018
    Location
    Malaysia
    Occupation
    Lens Manufacturer
    Posts
    1

    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.

    Thanks

  2. #2
    Rising Star Mauro.Airoldi's Avatar
    Join Date
    May 2007
    Location
    Bologna Italy
    Occupation
    Lens Manufacturer
    Posts
    98
    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.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Any Solution for Coating Failure!!
    By Craig in forum Smart Lens Technology by Transitions Optical
    Replies: 7
    Last Post: 12-04-2007, 11:15 AM
  2. Menicare Solution
    By vision-1 in forum General Optics and Eyecare Discussion Forum
    Replies: 0
    Last Post: 02-26-2007, 05:49 PM
  3. Looking for a solution
    By Bev Heishman in forum General Optics and Eyecare Discussion Forum
    Replies: 12
    Last Post: 10-20-2004, 06:10 PM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
OptiBoard is proudly sponsored by:
BC College of Optics, Younger Optics and Vision Equipment