Hi Edward,

I do believe that even by simply preventing the very harsh treatment of HASL of the finished board one may
improve the bow.

Jacob

Eltek Ltd. - Process Engineering wrote:

> At 08:28 21/07/98 +0300, you wrote:
> >You could try AlphaLevel.
>
> Could be so kind and explain to the forum , how AlfaLevel ( alternative
> finishing for soldering ) will fix bowed boards ??? If it works in this way
> , this is really great product .
>
> >
> >[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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> >
> Edward Szpruch
> Eltek Ltd - Israel
> Tel  972 3 9395050
> Fax 972 3 9309581
> E-mail :  [log in to unmask]
>
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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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