Lenny,
While I was working, I spent a lot of money in studies of the reflow process, and
what you suggest is not as bad as what Cecil suggest, but it is not good unless
you wash the moisture of the boards with nitrogen, and seal the bags.?
then you might be ok for overnight wait, but it is still risky.
I do not understand why they would want to keep PSB with paste and no parts.
It is cheaper to just clean the PCB with a Isopropyl Alcohol, then you can wait overnight
without any dry pack and nitrogen, and recycle it on the next morning.
I suggest that any paste on the board be reflowed in the next two hours.
So for hobby work, paste a few areas, add the parts, reflow, let cool, then you can wait
a bit for the next batch of parts. See my reply to Cecil for heat screen.
Jean-Paul
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On Apr 18, 2014, at 12:03 AM, w2bvh <
w2bvh@...> wrote:
At work they sometimes put boards with paste, without parts, in a small closed plastic box overnight (end of shift to start of shift) and it works out ok. They usually store it in a dry nitrogen box, but I don't think that really matters too much.
GL & 73,
Lenny W2BVH
On 4/17/2014 9:53 PM,
?jcs1@...?wrote:
?I am planning the build of an Ensemble RX and I am thinking of trying the griddle-heat gun reflow method to install the SMT parts. As far as blocking out time to apply the solder paste and place individual parts, how long can one let the applied parts stand without reflow? I would like to break the placement process up over several days but I am worried that the solder paste will separate or otherwise degrade if I don't place all the parts and reflow them in the same session. Can the process be broken up over a period of days or even a couple of weeks without ruining the already placed parts??
John Stockman, KC2THY
