Electronics Forum | Tue Jan 31 09:41:06 EST 2017 | emeto
If there is no specific quality reason, stay with paste. More processes you add, more points of failure. They don't need a lot of paste to get attached to the board. The ones I used were 8mil round apertures, so I did cut 1:1 on a 3 mil coated stenci
Electronics Forum | Wed Feb 01 11:33:37 EST 2017 | emeto
Joshua, 100um is 4mil aperture. You should ask several stencil houses about the possibility to print that small amount of paste(type 6 paste is available now with very small solder spheres 5-15um diameter). Even applying small amount(thin layer of f
Electronics Forum | Mon Feb 13 01:47:28 EST 2017 | soldertraining
Solder flux and solder paste deposition is a standard step during the chip attach and sphere attach portions of BGA and CSP assembly. A technique called ultra-violet fluorescence intensity mapping (UV FIM) has been introduced that allows flux measure
Electronics Forum | Wed Feb 01 03:17:10 EST 2017 | rob
Ok, that's small - I think you may need a special semi-conductor printer for this - positional accuracy on a "normal" SMT printer is no more than 20 micrometres from memory. In my semiconductror fab days we were printing with a positional accuracy
Electronics Forum | Thu Mar 20 20:57:44 EDT 2008 | rrpowers
Well, we are in fact doing a no-clean, multi-shift, very high volume, minimal changeover operation. We use up any paste long before it gets old. Because of the sheer volume any reduction in paste scrap for us is big money. We also are in a zero de
Electronics Forum | Thu Mar 20 18:39:30 EDT 2008 | cmckissick
I am not a big believer in these systems, unless you are doing a no-clean, multi-shift operation with minimum changeover. If you are a small batch shop, the amount of solder paste you end up wasting can actually be the same or more, if you are not r
Electronics Forum | Mon Nov 05 16:54:00 EST 2007 | bbarton
There are several things that can be done to increase throughput on you screen printer, including the panelization of your bords as Steve & Hussman has pointed out. However that's of limited use if you have plenty of stock that is not panelized. That
Electronics Forum | Sat Nov 17 12:58:12 EST 2007 | mika
I agree with previous postings regarding print speed: Solder paste type/versus fine pitch. Question: Is this a double sided pcb with fairly easy component packages on both sides? In such case, consider make the panel like this: Every second pcb in
Electronics Forum | Wed Mar 07 15:45:12 EST 2007 | dphilbrick
I have an Amistar Label Placer. Although it is a bit more expensive than a feeder it won't take up placement time on your real expensive P&P equipment you can put in line or off line. with added printers it will print and place different labels on th
Electronics Forum | Thu Nov 01 10:09:18 EDT 2007 | slthomas
Lke Pete C said it's specified by the manufacturer of the paste, but it's also board specific. We print a lot faster on boards with nothing smaller than 50 mil pitch than we would on 16.
