Teo,
If you are looking for a measuring instrument to measure
solderpaste conditions (dryness, moisture
adsorption, oxidation,...) scientificully, there is one company that
do make and market them. It checks the conditon of solderpaste
using tiny probes and measures electrochemical changes in the
paste. If you wish to know the company and the product, e-mail
me off-line. It sounds like an advertising if posted in the forum.
Don't dispose no-good-solderpaste, you recycle them. One way
you do is dumping them in a wavesoldering pot, and use a
plenty of Klneenox to prevent paste flux contamination in the pot.
Good luck with your operators,
Matthew
NII-Norsat International Inc.
e-mail: [log in to unmask]
>>> <[log in to unmask]> January 19, 1999 8:46 am
>>>
Ladies & Gentlemen:
We are currently experiencing a problem in our MPM printing
process.
Often, the solder paste gets dry and leads to product defects. As
a
result, operators dispose the "dry" solder paste. However, the
measure of
"dryness" is very subjective and varies from one operator to
another.
Consequently, our facility is disposing too much solder paste. Is
anybody
measuring the "dryness" of solder paste? If so, how are you
doing this? I
need a scientific way to determine solder paste dryness, and a
guide that
will let me know when the solder paste is no longer good. In
addition, is
there any way to "recycle" dry solder paste? Are there any
solvents or
chemicals that will restore the solder paste to its original
condition?
The solder paste is currently being placed by hand on the
stencil.
Before the stencils are washed, the solder paste is removed and
placed back
into the jar. This results in cross contamination of new and used
paste.
To resolve this cross contamination, we would like to use an
automatic
catridge dispenser which is available with MPM printers. Is
anybody using
these automatic dispensers? If so, do you have any "lessons
learned" or
"recommendations" for using this new equipment?
-Thanks for your help,
Teo Tijerina
Conexant Systems, Inc.
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