Subject: | |
From: | |
Date: | Tue, 05 Dec 95 08:32:58 EST |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
In my experience the current IPC test used by laminators to check dimensional
stability has no correlation to dimensional stability results after multilayer
lamination at a PCB shop. Is IPC investigating a different test method or
does any PCB shop have there own "dimensional check" for incoming laminate.
I'm working on this issue at our facility and I'd like to swap ideas with
other PCB shops.
Thanks in advance for any response.
Paul Formiller
Process Engineer - Merix Loveland
[log in to unmask]
phone (970)-203-6663 pager (970)-593-5562 fax (970)-203-6751
Paul,
I have run into the same problem. We have developed a test
that compares to the IPC method, but is more relevant for a
PCB shop. In general, we do something like the IPC test but
on a larger scale, continuing the test piece through a
relamination step. The problem is that it probably isn't
useful for an incoming laminate check, since it takes longer
to complete and you most likely don't want to sit on an
inventory of laminate waiting for results. Therefore, this
is best used as a dimensional stability test vehicle or a
process control tool.
However, we are working on a procedure like this that can
be completed quickly. If you would like to talk more about
this I can be reached at:
Ed Kelley
Senior Engineer
Hadco Corporation
Phone (607) 687-3425 Fax (607) 687-7457
E-Mail [log in to unmask] or [log in to unmask]
|
|
|