Thanks for the explanation... I have heard/seen water soluble oil being used in roller tinning, and it apparently worked well.. have never heard of salt being used until now.
Rudy Sedlak
Mike Fenner <[log in to unmask]> wrote:
The salt controls dross on the pot and (sometimes forgotten) ensures the
bottom roller remains tinned. The alternative to salt is vigilance and more
dross. Possibly you could use a [so called] water soluble oil, but I have
never seen this done, as these were introduced after roller tinning fell out
of use in Europe.
Roller tinning is an old process, but cheap. I think the nearest modern
equivalent process, to think of as an alternative, would be Hot Air Solder
Levelling. This would give much better or at least consistent solderability
and not have the blips on the trailing edge of pads.
Regards
Mike Fenner
Indium Corporation
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Baski Devre
Sent: 12 July 2006 16:39
To: [log in to unmask]
Subject: [TN] Roller Tinning Process
Dear Technetters
As you know that some PCB manufacturer uses roller tinning soldering
process. In this process firstly flux is spread over PCB and then passed
through rollers to be soldered. In this solder alloy sometimes a bit
salt is added to improve soldering quality and help solder to be appread
bright. I want to learn that if there is any alternative material used
in roller tinning soldering process to elaminate salt or is there any
alternative roller tinning soldering process flow.
Thanks in advance to your comments and knowledge share
Best Regards
--
Yusuf GÖMEÇ
Product Quality Engineer
BASKI DEVRE SAN ve TIC LTD STI
Ceyhan Sk. No:10 34896 Pendik-Istanbul-Turkey
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