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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