We are cartridges for solder paste and use pnematic caulking gun ( Cammda
Corp) replacing mechanical gun.
It is less expensive to discard dry solder paste than to rework. Take all
necessary measure to use up all the solder paste ASAP to keep wastages low.
We ship back dry solder wastes back to vendor alongwith solder dross.
Ashok Dhawan P .Eng
Sr Manuf Engineer
Unisys Canada Inc.
51 Burmac road Winnipeg
R2J 4C9 Mb Canada
Fone : 204-257-9199
Fax : 204-257-9104
Email: [log in to unmask]
-----Original Message-----
From: Jeff Hempton [SMTP:[log in to unmask]]
<mailto:[SMTP:[log in to unmask]]>
Sent: January 19, 1999 12:25 PM
To: [log in to unmask] <mailto:[log in to unmask]>
Subject: [TN] MPM solder Paste dryness and cartridge dispenser
..Oh, some other things. I have used both MPM and DEK in the past, and these
issues rarely are printer related. A rheometric pump (or ProFlow) head can
help with these issues, but again, there are so many great pastes out there
that do not have these issues, and can probably improve your printing
process, I would lean the route of a new paste qual as opposed to spending
the capital on a closed head system, unless you are printing
ultra-fine-pitch or pin-in-paste...unless of course capital is not a
concern, heh-heh. Again, good luck!
Jeff Hempton
United Technologies Electronic Controls
______________________________ Forward Header
__________________________________
Subject: [TN] MPM solder Paste dryness and cartridge dispenser
Author: [log in to unmask]
<mailto:[log in to unmask]> at Internet
Date: 1/19/99 9:46 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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