With not too much fiddling you can roller tin Kleenex (no flux needed, just
tape to a board) but you still can't solder it.
:)
Regards
Mike
-----Original Message-----
From: Gary Camac [mailto:[log in to unmask]]
Sent: 13 July 2006 12:37
To: [log in to unmask]
Subject: RE: [TN] Roller Tinning Process
Mike is correct about solderability issues with rolled tin. The process
could hide solderability problems that would ultimately reveal themselves at
the wave solder. It was hard for me to tell the difference between a rolled
finish and a fused electroplated finish prior to processing. I had a loose
canon in the purchasing department at that time, who looked at our material
specification was more of a guideline and it was better to get cheaper
boards than one's with good solderability. When HASL came along we got both
and wetting is obvious prior to our processes.
Gary Camac
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: Thursday, July 13, 2006 3:31 AM
To: [log in to unmask]
Subject: Re: [TN] Roller Tinning Process
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
T: + 44 1908 580 400
M: + 44 7810 526 317
F: + 44 1908 580 411
E: [log in to unmask]
W: www.indium.com
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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
Tel: 00 90 216 3901036 (4 Hat/Line)-173(Extention)
00 90 216 4836560 (4 Hat/Line)-173(Extention)
Fax: 00 90 216 3544941
00 90 216 4913269
Gsm: 00 90 533 6579897
00 90 533 7480014
msn: [log in to unmask]
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