Electronics Forum | Tue Oct 03 11:07:00 EDT 2000 | C.K.
"In Reality there's no additional cost or extra cost for the cleaning time since there is no increase on operator's wage in doing the cleaning but instead just an additional load or job for the operators at the same wage cost." I'd have to agree...
Electronics Forum | Fri Dec 10 12:06:35 EST 1999 | Gary Kemp
Tracy, I would check the squeegee blade for wear at the edges. Also, check the squeegee pressure to ensure it is not to high, forcing the paste between the stencil and the land, causing a smear. Good luck.
Electronics Forum | Tue Mar 22 11:48:33 EDT 2011 | cyber_wolf
Make sure the paper is advancing correctly on your stencil wiper. I have seen this cause major issues. If the paper hangs up, it will smear paste across the bottom of the stencil every time it wipes.
Electronics Forum | Tue Mar 22 11:57:07 EDT 2011 | jercole
Make sure the paper is advancing correctly on > your stencil wiper. I have seen this cause major > issues. If the paper hangs up, it will smear > paste across the bottom of the stencil every time > it wipes. We are manually cleaning the stenci
Electronics Forum | Thu Sep 29 18:57:14 EDT 2016 | vchauhan
Is it ok to re-print the mis-print PCB? Personally I am oppose to re-print the mis-print board. For two reasons. 1. You will end up adding solder paste on the bottom side of the stencil. 2. You may smear solder paste in some area. But I would like to
Electronics Forum | Fri Feb 24 08:29:25 EST 2006 | davef
Step stencils are not widely used, due to: * Higher cost as compared to uniform thickness stencils * Danger of solder paste smearing at least close to the steps * Difficulty of cleaning the stepped stencil underside (the steps cannot be on the upper
Electronics Forum | Thu Oct 23 09:45:05 EDT 2014 | rgduval
Generally, excess solder balls found randomly around the board/parts points to either a dirty stencil during printing, or a stencil/board that is shifting during printing (smearing the paste a little, and causing a dirty stencil. If the apertures ar
Electronics Forum | Tue Nov 07 10:09:51 EST 2000 | Kevin
John, Depends on what you're cleaning (paste, adhesive, ink, etc..) and your process (do operators just dump a dirty stencil in and expect a clean one out, drying time, effect on the polyester). I could suggest a couple of name brand cleaners, but I
Electronics Forum | Fri Dec 10 02:26:16 EST 1999 | Tracy Guo
Hi, I'm facing smear after printing on DEK288 using reverse squeegee at the edge of panels. I've checked the fixture, printing parameter, stencil, solder paste. What else can I do?
Electronics Forum | Tue May 02 05:59:28 EDT 2006 | davef
We agree with Ken's points about off contact / screen versus stencil, but this DHolt is talking stencil [regardless of what is typed about screens]. Comments are: * On "smears under the stencil": smearing happens. It makes us wonder about the frequ
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