Electronics Forum | Thu Jun 20 10:48:56 EDT 2002 | Hussman69
When you ask for data in terms of rework, do you want reflow solder yields versus wave solder yields? Or do you want repair data from each process, or yield data that shows actual glue defects from screen printing versus solder paste screen printing
Electronics Forum | Mon May 26 04:02:13 EDT 2003 | Franky
Dear sir, I think so with every idea , everyone is correct , paste , pattern of pad design ,profiling or solder mask on PCB ,and one of the cause of tombstone that I found is alignment of machine placing and solder printing , from my experience many
Electronics Forum | Thu Dec 30 23:25:49 EST 1999 | Henry C. Yao
We're using 96.5/3.5 high temp solder paste for our production and we're encountering soldering defects particularly non wetting (tombstoning). A technical document I read mentioned that there is a sort of a problem with the wettability of this paste
Electronics Forum | Sat Jul 24 00:31:21 EDT 1999 | Scott McKee
| Has anyone ever heard of testing solder paste quality by pasting a board and making a determination of the quality by measuring paste height and width after the board is pasted. Would you consider this a valid test for solder paste testing? | I ag
Electronics Forum | Thu Mar 07 15:38:34 EST 2002 | kg
I can point to at least one recent study with contrary evidence that 60% of SMT problems are printing problems. The study is published in the APEX 2002 conference proceedings, a joint effort between Aglient and Nokia entitled 'Paste Inspection Study
Electronics Forum | Tue Sep 19 22:15:53 EDT 2000 | Sophia
Hi guys, I have been working in the SMT pick and place process for five years, and now I'm responsible for the solder paste printing process, and one thing that I notice is that the actual process that we have is to poor, actually our main defects a
Electronics Forum | Mon May 06 12:44:50 EDT 2002 | Bob Willis
The SMART Group is starting a new project on PPM Monitoring which will be providing average PPM yield data per month free to the industry. I would like to get feedback or exchange criteria for paste printing as non exists with in IPC or similar organ
Electronics Forum | Tue Jan 12 21:42:33 EST 1999 | Jon Medernach
What's important in stencil printing (which differs from screen printing) is providing a consistant volume of paste at each interconnect. The process window varies in proportion to the pitch. More than 60% of all defects are related to solder depos
Electronics Forum | Fri Aug 26 21:23:38 EDT 2005 | Jes�s Salinas
Hello , In our case we take the results from the repair station. Each test station has its own repair station so from there we count the process defects : placement and printing. The formula used to calculate PPM = DEFECTS / (PARTS PER BOARD x UNITS
Electronics Forum | Fri Feb 16 09:30:38 EST 2007 | DEK Answer Guy
Hello PR, PumpPrint� technologies enable high throughput adhesive deposition using a screen printing platform. Careful selection of stencil material, and informed study of the design of apertures and other stencil features, enables a wide range of
