Chere Henri;
     
     Most people, in my experience, now have cut sheet laminators which cut 
     the sheet from a roll of photoresist prior to laminating it, thus 
     leaving approx 1/4" of bare copper around the edge of a panel after 
     dry film lamination.  This removes the need of trimming after dry film 
     lamination.  Please contact your Dry Film Vendor for manufacturers of 
     this equipment in your area, if interested. If you are using a hot 
     roll laminator, an old method that we used to use is to utilize 
     something like a hot (heated Exacto knife) to trim panels after 
     lamination.  This tended to reduce the number of flakes from the edge 
     of a board by melting the photoresist as it cut.  The down side to 
     this is that it made the photoresist harder to develope right at the 
     edges because of heat polymerization.  The heat also sometimes stuck 
     the polyethylene cover sheet to the photoresist, sometimes making the 
     polyethylene difficult to remove prior to developing.  This method is 
     technique sensitive and the knife should not get to hot.
     
     Apologies for the delay in this answer, but I have been out of the 
     loop for a while.
     
     Good Luck, hope this helps.
     
     Greg Schroeder
     [log in to unmask]

______________________________ Reply Separator _________________________________
Subject: FAB: Prefered way of cutting dry film after lamination
Author:  [log in to unmask] at SMTPLINK-HADCO
Date:    8/31/96 3:17 AM


Cheres Technettrices et Technetteurs,
We are still producing a certain amount of our production using dry film 
and our progress group is wondering how some of you are achieving nice 
clean cuts on the edges of the panels, because we have some rejects due 
to small particules of dry film that are moving into improper places... 
Thank you for your reply.
Roland
     
-- 
Henri Jaquet SA - POB 770 - 1212 GRAND-LANCY 1 - GENEVA - SWITZERLAND 
T. xx41-22-794-7878 F. xx41-22-794-3052
     
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