Electronics Forum | Fri Jul 29 10:03:02 EDT 2011 | blnorman
At a previous location we used the Semco cartridges. Occasionally the operator would have to scrape down the stencil and knead the paste back in. That would keep the paste on the edges from drying out. It was just standard procedure.
Electronics Forum | Wed Jul 27 09:58:05 EDT 2011 | davef
Pressure printing systems Conventional stencil printing techniques have fundamental limitations as regards paste handling: The volume of paste available for printing is limited, so frequent replenishment is necessary Paste is difficult to c
Electronics Forum | Tue Jul 02 15:50:28 EDT 2002 | blnorman
FIrst, be a doubting Thomas and never trust supplier propaganda sheets, do your own testing. How often do you knead the paste? We have a standing requirement that if the paste printer is idle for 30 minutes, we have a minimum of 4 kneads before pri
Electronics Forum | Wed Dec 06 16:14:25 EST 2006 | realchunks
Assuming you meant 38 percent humidity - I would have to say your environment is only part of the problem. When you experience this problem, is because the paste has set idle for a period of time? If you knead the paste does the fine pitch print OK
Electronics Forum | Sat Jul 24 04:18:39 EDT 2004 | kent_peterson
Microwave? Try some steel wool next time. Are you cookin food in that microwave? I would love to see that documented into a process. You could look at changing the solder paste you use. Knead it up other than that mate.
Electronics Forum | Thu Jul 22 15:18:28 EDT 2004 | russ
Remove the paste from the fridge the night before, If you feel the need to knead we just put the paste on the stencil and work it a little bit with a spatula. Russ
Electronics Forum | Thu Jul 22 21:26:29 EDT 2004 | Grant
Hi, It's removed from the fridge, and the tube is loaded into the stencil printer, however it's winter here right now, so it's still quite cold. It's Australia, so when I say cold, that's relative, however the room can be about 10 dec C in the morni
Electronics Forum | Thu Jul 22 06:33:28 EDT 2004 | Grant
Hi, I wondered how people warmed up solder paste at the start of the days production. I saw some paste mixers at a show, but only saw ones that mixed small solder paste tubs, not tubes. Can you get mixers that handle tubes. They said these mixers a
Electronics Forum | Fri Sep 13 14:21:49 EDT 2002 | blnorman
Run a test, but in our experience, yes you can reuse the paste. We ran tests on paste that was left on the stencil at the end of second shift, we put the paste back on the stencil the next day on first shift with no problems. You definitely want to
Electronics Forum | Wed Aug 29 20:48:09 EDT 2001 | Jones
I know this is not the answer to your question but it may help until you get the right cleaning process in place. I have found that kneading the paste with 3-4 double strokes during the first print has aided in bring our defective ppm down somewhat.
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