Thanks!

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Pete menuez
Sent: Friday, February 04, 2005 12:11 PM
To: [log in to unmask]
Subject: Re: [TN] Warp & Twist


Multilayers
Unbalanced layup - more copper on layers 1 - 5 than 6 - 10 (for example)
Warped caul (tooling) plates
Weave orientation
Lamination Rise time
The use of aluminum vs. steel separator plates
Odd layer count

Doublesided
Unbalanced circuitry on side one vs.two
Material- I remember we used to purchase DS material from a laminator (no
longer in business) that always warped - I think it was 7 ply instead of a
standard 8 ply.

Hope this helps.
pete


>From: Judy Brown <[log in to unmask]>
>Reply-To: TechNet E-Mail Forum <[log in to unmask]>,              Judy Brown
><[log in to unmask]>
>To: [log in to unmask]
>Subject: [TN] Warp & Twist
>Date: Fri, 4 Feb 2005 10:45:15 -0800
>
>I know I saw what I need somewhere, but I can't remember the document. I
>need the causes for PCB warp and twist.
>
>Judy Rae Brown
>Quality Assurance Manager
>EXPRESS MANUFACTURING, INC.
>Electronic Manufacturing Services
>3519 West Warner Avenue
>Santa Ana, CA 92704
>714.979.2228 - Tel
>714.556.0575 - Fax
>Email: [log in to unmask]
>Website: <http://www.eminc.com/>
>
>
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