Also, the lamination cool down rate is recommended at less than 10 degress F
per minute until about 250 degrees F. Some folks use cool presses and others
use the old fan on the stacks while on a shelf, depending on the through-put
required of the lamination area.

My 2 cents,

Russ

>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: Re: [TN] Warp & Twist
>Date: Fri, 4 Feb 2005 12:16:47 -0800
>
>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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