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Date: | Fri, 21 Feb 97 10:41:37 EST |
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A colleague, Rick Day, has provided the following response to the Vacrel
8140 lamination question:
We see this "laking" phenomenon when the laminator temperature
is too high. The color differences are due to thickness differences.
I'd check the temperature uniformity - if there are hot spots, that will
be the worst area. I would also lower the temperature and see how that
affects this defect. Vacrel 8100 is fairly soft and can be laminated at
relatively low temperatures (compared to some other dry films). The
dwell time may need to be lengthened to compensate for lower temperature.
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Subject: FAB, soldermask lamination
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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
ÿÿ
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