You could try AlphaLevel.

[log in to unmask] wrote:

> Technetters.
> We are manufacturing multilayer printed circuit boards.
> One of our customers request us to make 6 layer memory module
> board(7"X6.3"X0.05"t) of which bow tolerance is Max 0.30%.
> It's very tough job.
> Our 1st yield for that board is lower than 80%.
> Lamination stack height, heating rate, cooling rate, cushion material, layup
> construction, coppper balance, baking....
> These parameters which I thought related with flatteness were tested many
> times. But we still see bowed boards(Max 0.70%).
> I will make every effort to make SUPER FLAT BOARD.
> Any advice would be appreciated.
> Thanks in advance.
> Herold Green
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--
Jacob Mozel
11 Hakalanit St
44280 Kfar Saba, Israel
Tel: +972 9 7425871
Fax: +972 9 7424089
e-mail: <[log in to unmask]

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