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An interesting suggestion, but one that needs a little care in
implementation.
This may well introduce another problem - condensation on to the board and
onto then into the paste on exit from the fridge. The boards should be
covered on placing in fridge and not uncovered till they are at ambient if
this is done.
Kind Regards
Mike Fenner
Applications Engineer, European Operations
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
Leadfree: www.Pb-Free.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Dan R. Johnson
Sent: Wednesday, July 31, 2002 5:09 PM
To: [log in to unmask]
Subject: Re: [TN] Paste sit time
Michael,
I agree with the comments that it depends on the paste. I would add another
option. You can extend the working life of printed paste by keeping the
pasted PCB in a refrigerator, this slows the evaporation of volatiles. Again
consult your paste vendor. I have held units overnight this way during
prototyping and still had good re-flow, wouldn't go that long in production
though.
The best option would be changing to a past with a long working time.
BTW will management let you spend some of the money saved on other
equipment? Could soften the blow of compromising the ideal line set-up ;)
Dan
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