Electronics Forum | Tue Jul 02 14:24:30 EDT 2002 | paul_bmc
My question is refering to "stencil life". How accurate is this and is this something I can go by. The solder paste I am using is Kester R562, R562 specifications state that it has a 12 hour stencil life, optimal temp ranges 70-77 F, 35-65% RH. Ou
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 | Thu Jan 14 15:22:14 EST 1999 | Earl Moon
| Steve, | Whoa, take a breath! That was at least a dollar three-eighty answer. I've got to agree that nothing can replace a qualified, concientious operator for assuring quality. When I too worked at a small shop there in SillyCone Valley, my
Electronics Forum | Tue Feb 11 10:47:02 EST 2020 | dunks
What paste do you use in this instance?
Electronics Forum | Mon Feb 10 10:23:53 EST 2020 | emeto
Solder paste has stencil life time - if you go over it means you should change it. If you print boards in front and keep them for too long before reflow, the flux is still evaporating, so you are not mitigating the risk. Paste also likes room tempera
Electronics Forum | Fri Feb 07 20:41:52 EST 2020 | orbitcoms
I am finding if I have to stop the pick and place machine during production very often (mostly due to feeders not pulling the tape cover back), I get paste drying in the apertures of the stencil. To avoid this I am thinking of pasting all the boards
Electronics Forum | Thu Feb 27 12:41:21 EST 2020 | duke211
look at the specs of your solder and stencil life. Check the humidity, low humidity dries the paste. Slowing down your swipe speed and frequent wipe cleaning of your stencil can help.
Electronics Forum | Sat Feb 08 04:37:19 EST 2020 | spoiltforchoice
I work with small batches and this is what I do. However I don't do it because of the paste. Instead I do it because I am the sole operator on the line and I want one process finished so I can keep a better eye on the others. I specifically work with
Electronics Forum | Tue Feb 11 14:37:26 EST 2020 | spoiltforchoice
If you're asking me, I'm using BLT LFS-UFP-T4 (they have an even better paste to treat badly now if you add zq). Those in the test of the world might find Loctite GC10 is similar, however the stencil and tack times on the BLT are pretty awesome and
Electronics Forum | Mon Feb 10 10:39:39 EST 2020 | slthomas
As has already been suggested, make sure you are cleaning your stencil well between long periods of inactivity. That said, it sounds to me like you have a feeder problem to solve before you get too wrapped up in what to do with your printing process
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