Sefika
At AT&T I built a lot of flex for OEM customers and we routinely used
bookbinding with high layer count. There are other guide lines that should
be followed as well. I suggest that you contact your flex supplier, most of
them have design guides that optimize the design for their particular
process.
Best regards
J. Lee Parker, Ph.D.
JLP Consultants LLC
804 779 3389
----- Original Message -----
From: "Şefika ÖZKAL" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, May 31, 2007 1:59 AM
Subject: Re: [TN] how to bend 10-layer bonded flex
> Hi,
>
> Thank you very much for your commends. I have searched IPC-2223A, at page
> 13, in section "5.2.4.3. Bonded Multilayer Bending", it is written as "A
> recommended bend radius greater than two bonded layers in the bend area is
> 20 times the overall thickness."
>
>
>
> In our design, we also used line/space width as 4 mils. Moreover, I did
> not
> have any experience about "bookbinding".
>
> Is bookbinding safe? Does any standard support this method?
>
> Can you offer any manufacturers who can do "bookbinding"?
>
> Does bookbinding have any restrictions about line/space width?
>
>
>
> Regards
>
>
>
> Sefika OZKAL
>
> _____
>
> From: [log in to unmask] [mailto:[log in to unmask]]
> Sent: Wednesday, May 30, 2007 1:18 PM
> To: [log in to unmask]; [log in to unmask]
> Subject: Re: [TN] how to bend 10-layer bonded flex
>
>
>
> Hi Sefika,
> I do not know where you get this from that "According to the IPC min. bend
> radius for this type of flex is 20 x thickness = 20 x 1.02 mm=2.04
> cm"-does
> not make sense.
> For your flex design you need a 'bookbinder' geometry.
>
>
>
> Werner
>
>
>
> **************************************
> See what's free at http://www.aol.com <http://www.aol.com/> .
>
> _____
>
> From: [log in to unmask]
> Sent: Wednesday, May 30, 2007 1:18 PM
> To: [log in to unmask]; [log in to unmask]
> Subject: [TN] how to bend 10-layer bonded flex
>
>
>
> Hi,
>
> I have a rigid-flex pcb which has 10-layer bonded flex. The flex part's
> length is 10 cm and its width is 1.02 mm. According to the IPC min. bend
> radius for this type of flex is 20 x thickness = 20 x 1.02 mm=2.04 cm. (I
> know, this type of design is not recommended...) It is hard to bend the
> flex. I tried to heat it at 90 C, for 45 min. Now it is better than
> before,
> but I do not know if I did anyting wrong. I have not tested the lines if
> there is open yet.
>
> Do you think it is a good idea to heat it? And in which conditions is it
> safe if so?
>
> Or do you have any commend?
>
> Thanks in advance,
>
> Regards
>
>
>
> Sefika OZKAL
>
>
>
>
>
>
>
>
>
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