In reality since outer layers aren't imaged until after drilling I don't
believe there is an alignment improvement. There is certainly a cost
reduction to the fabricator associated with a foil build both from a
simpler process and from the fact that foil and prepreg is cheaper than
rigid
Regards
Ian
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Thayer, Wayne - IIW
Sent: 19 May 2011 14:45
To: [log in to unmask]
Subject: Re: [TN] Core vs Foil Lamination
You can align the phototool to the next layer down, so there's no error
due to movement in the lamination press.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Marsico, James - ES
Sent: Thursday, May 19, 2011 9:36 AM
To: [log in to unmask]
Subject: Re: [TN] Core vs Foil Lamination
I want to thank all of you for your responses to my inquiry. One last
question, though. How does the foil lamination process make for
easier/better registration than the core lamination process?
Jim Marsico
ITT Corporation
1500 New Horizons Blvd.
North Amityville, NY 11701
631-630-5079
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Fox, Ian
Sent: Wednesday, May 18, 2011 3:21 AM
To: [log in to unmask]
Subject: Re: [TN] Core vs Foil Lamination
In my experience there is little difference in performance from a
functional perspective between a foil or rigid outer layer. However, you
may find the peel strength of a foil outer a little lower than that of
the rigid, but in most situations it will not be an issue. As Wayne says
unless contractually obligated re-qual shouldn't be necessary
Regards
Ian Fox
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Thayer, Wayne - IIW
Sent: 17 May 2011 22:47
To: [log in to unmask]
Subject: Re: [TN] Core vs Foil Lamination
I can tell the difference if I cross section because of the way the
prepregs flow over traces. And pre-pregs have different strength
characteristics than core layers (but probably close enough for a
vibration spec). Cores also have better thickness control for lines
with defined impedance (yes, those should be carefully noted on the
fabrication drawing, but that doesn't always happen). So there is no
set answer on re-qual. SHOULDN'T be necessary, but...
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ian Hanna
Sent: Tuesday, May 17, 2011 5:13 PM
To: [log in to unmask]
Subject: Re: [TN] Core vs Foil Lamination
or if it is on print -- military qualification, for example, requires
separate qualification for foil lamination...it's an anachronism, but
you are contractually bound just the same -- Ian
From:
Harris Dy <[log in to unmask]>
To:
<[log in to unmask]>
Date:
17/05/2011 05:09 PM
Subject:
Re: [TN] Core vs Foil Lamination
Sent by:
TechNet <[log in to unmask]>
Absolutely! After mass lamination, you won't even recognize if the panel
that came out of the press was foil laminated or core laminated. Foil
lamination is now the more popular way of building multilayer boards.
The only reason you would want to do core lamination is if the design
involves sequential lamination or blind/buried via technology.
Thanks,
Harris
--- On Tue, 5/17/11, Marsico, James - ES <[log in to unmask]> wrote:
From: Marsico, James - ES <[log in to unmask]>
Subject: [TN] Core vs Foil Lamination
To: [log in to unmask]
Date: Tuesday, May 17, 2011, 10:39 AM
Good Day Technet:
We have a heritage PWB design for a space application where our drawing
requires a core laminating process. One of our suppliers is requesting
using foil lamination in lieu of core lamination for registration
issues.
Since we qualified the original core lamination, can foil lamination be
a direct substitute?
Thanks in advance,
Jim Marsico
ITT Corporation
1500 New Horizons Blvd.
North Amityville, NY 11701
631-630-5079
[log in to unmask]<mailto:[log in to unmask]>
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