Interesting... our supplier specifically said that they do not like doing core lamination because of registration issues. 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: Thursday, May 19, 2011 10:58 AM To: [log in to unmask] Subject: Re: [TN] Core vs Foil Lamination 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? 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