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Date: | Thu, 20 Feb 97 14:49:29 PST |
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I have seen a similar problem when laminating dry film products on our vacuum
laminator. Mostly on photo coverlay (for Flex) and primary resist. We call it
pre tack, which means the film as attached itself to the surface before the
actual lamination. When the process cycle proceeds the entire film is pulled
toward the area of "pre tack" leaving this circular wrinkle.
Ask your self: Is the panel to hot?
Did something or somebody apply unwanted, early pressure to that
spot?
Does the mask need to be suspended over the panel?
Good luck
Chuck Brummer
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______________________________ Reply Separator _________________________________
Subject: FAB, soldermask lamination
Author: [log in to unmask] at ccUnix
Date: 2/20/97 11:36 AM
Hello Technet,
We have been experiencing problems with our soldermask lamination process. We
use Dupont's Vacrel 8140 dry film soldermask, and apply with an EH2400 vacuum
laminator. Upon removal from the laminator, we frequently see that rings have
formed in the soldermask. The rim of the ring is darker green, and the area
confined by the ring is lighter green than the surrounding soldermask. We
have requested help/suggestions from mfg of both laminator and film, but as
often happens, each says the problem is not with their product.
Has anyone else experienced this problem while vacuum laminating dry film
soldermask? Any suggestions on how to eliminate this problem would be greatly
appreciated.
cbh
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