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| Reply To: | TechNet E-Mail Forum. |
| Date: | Sun, 11 Jun 2000 08:26:52 +0300 |
| Content-Type: | text/plain |
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Hi Jan
Here are some inputs for you.
1. Use kiss pressure in the lamination cycle.
2. Use resin rich prepregs specially against the copper foil.
3. If you are working with oversize copper check the separators, they should
be fine polished
(Also keep the separators clean & dry for smoothness), But it is better
to use a release film
instead oversize copper on this specific job.
4. Try to use different type of foil from different vendor, anyway HTE
copper foil should give
you better results.
Hope this will help.
Regards
Sh. Shalev
Eltek - Process Engineering
Israel
> -----Original Message-----
> From: Jan Thuesen [SMTP:[log in to unmask]]
> Sent: ε ιεπι 09 2000 12:33
> To: [log in to unmask]
> Subject: [TN] Wrinkles in copper foil
>
> Dear Technetters,
> we have been seeing increasingly problems with wrinkles in outerlayer
> copper foil on certain jobs.
> The wrinkles are coming from the press-lamination of multilayers.
>
> We have tried different things to minimize the problem like optimising
> heat up and cool down time and temperature, different types of presspads,
> awareness at lay up, adding copper areas to the underlying layers,
> different prepregstyles amo.
>
> If any of you have some additional inputs to the cause of the problems, we
> will be very interested in hearing from you.
>
> With best regards
>
> Jan Thuesen
>
>
>
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