Normally you use a core without copper when the number of prepregs used
between cores exceeds 4, to avoid slippage in the press and maintain good
thickness control.

regards
Dougal
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of SAHLI habib
Sent: 22 December 2008 14:40
To: [log in to unmask]
Subject: [TN] Multilayer construction

Hello,

Are there some rules which allow us to know when it's necessary to use a
blank material (core without copper) combined with prepreg?

What are the advantages and disadvantages if any?


Best regards.

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