soft white soap, what's that?
Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: den 14 augusti 2007 09:05
To: [log in to unmask]
Subject: Re: [TN] Aqueous batch cleaner foaming
I agree with Rudy, especially about temperature. However, if your first water is too hot, depending on the flux chemistry, the cleaning quality may be less good. This is especially so if the flux activator contains amino acids or their derivatives. The ideal temperature is 55-60°C, no higher.
You can buy defoamer from flux manufacturers, but add minimal quantities. This is not a case of a little is good, so a lot must be better. Alternatively, you can make your own. I quote my book:
"Dissolve 300 g soft white soap in one litre of hot water. When cool, add one litre of octyl alcohol. Shake before use. Add the minimum dose to obtain the desired effect, usually about 0.1 cm3/l"
Brian
Rob Strecker wrote:
> All,
>
> Has anyone else had foaming issues in an aqueous wash batch cleaner?
> What are some of the causes of excess foaming? We are applying our
> wave flux via spray; however this flux is also suitable in foaming
> flux applications. We are currently in the process of optimizing our
> flux application in the wave to significantly reduce the flux residue
> on the boards. This includes optimizing the sprayers, preheats and dwell time.
> Initial tests show this is not having a major impact in reducing the
> foaming. We will be testing boards with only SMT flux residue, then
> ones with only wave flux residue. The theory is that by themselves
> they do not foam but when mixed cause foaming. We have recently
> changed Paste suppliers, thus we now have two different manufactures
> of flux mixing in the wash (one from SMT, one from wave). Could this
> be a cause of excessive foaming?
>
>
>
> Thanks,
>
> Rob Strecker
>
>
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