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April 2001

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Subject:
Bow and twist
From:
"Flatfield, Cadcam" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 23 Apr 2001 16:24:02 +0200
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Hello,

I have a question about the bow and twist of printed circuit boards.

I have had some boards with bow and twist. As a result of shearing the prepregs in the wrong direction. 

Now I have double sided boards with the same problem ( bow and twist about 3% ). I have seen that the b&t  is on all the boards that have V-cut/scoring on them. These boards are about 400mm long and have scoring in the length of the panel. 

Can this bow and twist be a result of the scoring of the board?

If so what can i do to prevent is from happening.

Best regards,

Gerard

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