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 | Fri Apr 27 11:24:53 EDT 2007 | realchunks
Hi Steve-O, Good question(s). This process was set-up by an engineer that had a PhD in statistics, took him a year to develop and then thru it over the wall at us. The biggest problem we saw was SPC to measure solder volume. SPC is good for measu
Electronics Forum | Thu Apr 26 10:07:06 EDT 2007 | realchunks
Hi Dub J, I have worked for a few companies that did 3D sampling and found the data they produce to be useless. In the real world they are slow, so that means you won't sample every board. Now if you're not sampling every board, and you start to r
Electronics Forum | Fri Apr 27 10:33:58 EDT 2007 | ck_the_flip
Jeremy, well said! Thanks for "validating" my theory... LOL I agree that the sampling frequency, AND methodology are key things with 3D inspection. 3D will give you some insight onto how your paste (rheology, viscosity, thixotropy)AND process are
Electronics Forum | Wed Jun 06 02:59:11 EDT 2018 | buckcho
Mr. Evtimov, Koh Young and Parmi have this option in their SPC software. You can also choose either Volume, Area, position, height (both in um or %). Here is a screenshot from Parmi. Unfortunatelly i cant find my old Koh Young screenshots. Parmi has
Electronics Forum | Fri Jun 08 01:25:02 EDT 2018 | buckcho
Hello, good choice! Koh young makes great reports for cpk. Only one advice. If you take 50panels from production and your cpk seems low, try to group the different kinds of components. Because also cpk on a whole panel would be not good number as wel
Electronics Forum | Thu Dec 10 09:06:47 EST 2009 | stepheniii
Just how cold do you store your paste? And what are your solder paste reps like? Here they fall over each other giving support for their paste. And have you seen the problem with flux separation or have you only heard about it?
Electronics Forum | Tue Dec 08 08:52:42 EST 2009 | cunningham
How do people prepare there solder paste for screen print? We currently remove them from the fridge and mix them in a 500g solder paste tub mixer to mix the flux and paste together we waste to much paste at the moment as we only use the tub for 1
Electronics Forum | Mon Dec 14 18:45:08 EST 2009 | gregoryyork
why not use a paste where it requires no refrigeration at all cheers Greg
Electronics Forum | Tue Dec 15 00:09:26 EST 2009 | isd_jwendell
Which paste are you referring to?
