Yes VPR is making a putative comeback in Europe just now on the back of
Pb-free. The benefit of Vapour phase (or condensation reflow to give it an
earlier name) is that it is an equilibrium process and once work has reached
the temperature of the vapour no further heating takes place, thus the
maximum temperature is intrinsic to the process.
In a saturated vapour system the air can be virtually completely displaced
by the vapour and this would give an anaerobic environment just like a
nitrogen atmosphere as stated. Not all machines use a saturated environment.
So far so good, how well the machine works in practice is down as always to
engineering. For example The actual residual oxygen content will depend on
the stability of the vapour blanket under production loading rather than at
rest.
I suggest you need to look at a couple of these to make user that the
benefits on paper are realised in metal, and suit your work rate
requirements at an affordable cost. There is no question that some of these
machines work well in low volume prototyping as they are hard to get badly
wrong, VPR is particularly suited to large boards with heavy thermal
loadings. Others are a little optimistic in their aspirations.
Regards
Mike Fenner
Indium Corporation, UK
T: + 44 1908 580 400
M: + 44 7810 526 317
F: + 44 1908 580 411
E: [log in to unmask]
W: www.indium.com
Pb-free: www.Pb-Free.com
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Richard Kraszewski
Sent: Monday, April 25, 2005 4:22 PM
To: [log in to unmask]
Subject: Re: [LF] lead free vapor phase reflow
There is a European company which tends to still be very actively involved
in VP soldering for lead-free. I would guess they can at least point you in
the right direction. Contact information is as follows:
EPM-IBL
Their North American Distributors are @
WEB Site http://www.aictechnologies.com Email: [log in to unmask]
Hope this helps.
Rich K KEDS
Phone: 260.925.8719
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Denis Ryskamp
Sent: Monday, April 25, 2005 10:00 AM
To: [log in to unmask]
Subject: Re: [LF] lead free vapor phase reflow
Hello all.
Just returned from evaluating an EMS provider. The company is using a vapor
phase reflow system (using a Teflon based liquid). The claim is that the
temperature used is 230°C max and using a nitrogen atmosphere. Has any one
had experience with this type of reflow? If so, what were the results?
Thanks,
Denis
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