Baking will make the laminate to get more cure. If laminate cure not
enough, after drilling you will found rough hole wall. And when it
passed plated through process, rough area will etched more by
permanganate. That mean you will get the rough hole wall and sometime
can cause short at the interconnection area (multilayer). Sometime it
also can cause 
the problem shrink and extend boards.



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Parial Swati
Sent: Wednesday, February 18, 2004 2:26 PM
To: [log in to unmask]
Subject: [TN] Baking of Laminates before processing

Dear Technetters,

We have the procedure of Baking FR4 laminates used for making Double
side
boards before Drilling them.
Can any one advise as to why is this baking process needed ?
What are the implications of processing without baking ?

Warm regards,
Swati...
Scan by AT&S virus protection

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