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Date: | Tue, 24 Sep 96 17:36:41 EST |
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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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