Electronics Forum | Tue Dec 07 10:47:09 EST 2010 | walkbury
As a high mix, low volume CEM who deal with a lot of free-issued kits, we are heavily reliant on foil (tape cover) extenders. We don't usually bother with splicing as our machine feeders (Simenes Siplace and Samsung SM321) are designed in such a way
Electronics Forum | Thu Oct 21 21:26:19 EDT 1999 | Dave F
Yims: There's several threads in the archives on re-useable stencil frames, but they seem to be focused on a limited nubmer of suppliers. I'm trying to take a big picture of the suppliers of these frames. So I'd like to know about: 1 ITT ProFrame
Electronics Forum | Mon Jun 14 12:16:03 EDT 1999 | Earl Moon
| I am looking into Alpha's system, and would appreciate some feedback from anybody using it currently. I am concerned about about the life expectancy of the foils if they are clamped and unclamped every couple of days, and what happens if one of the
Electronics Forum | Fri Aug 07 10:14:43 EDT 1998 | RWW
| I'm currently running a double sided paste smt board loaded with 0603's, on the secondary side. Many of the 0603 devices tombstone during reflow if the parts are not perfectly centered on the pads. Is this caused by the .008 foil thickness? Has any
Electronics Forum | Thu Jan 04 12:51:37 EST 2007 | Board House
Hi Chunks, Starting copper on outer layer with .0007 is 1/2 oz. copper foil. so if starting copper is .0007 and your Board house will plate an additional .0021 mils of copper. which will give you a finished copper weight of .0028 Mils or (2 oz.) Y
Electronics Forum | Tue Dec 09 18:03:39 EST 2008 | davef
First, you cannot determine foil thickness from its weight per area, because there is significant variation in the density of electrodeposited copper. Second, the official IPC specification for minimum thickness is "after" processing by the fabricat
Electronics Forum | Tue Apr 23 15:18:02 EDT 2013 | davef
2 oz copper should be 2 oz per ft^2 thick. There is no relationship between thickness and copper weight due to the effect of processing. Since this is a painful way of thinking about things, ppl have reached a compromise and talk about 'nominal thick
Electronics Forum | Tue Aug 15 07:02:13 EDT 2000 | George Verboven
We are assembling SMD-Leds (Chip LED cl-220yg-c-ts)on flex foil with Electrical conductive glue (Matthey A1401). When we investigated these foils we found cracks between the conductive adhesive and round the edge of the Chip-leds. This cracks cause f
Electronics Forum | Thu Aug 10 13:36:48 EDT 2000 | Bob Willis
I recently have been examining multilayer board failures. They are the classic inner connection failure between the foil and the through hole plating which I have not seen in many years. Has any one experienced any issues recently specifically relati
Electronics Forum | Tue May 02 17:26:33 EDT 2000 | Steve Thomas
As I understand it, though, a 90 sec. 75F wash and a 15 second rinse (plus the lift cycle, another 10 secs., perhaps) at a MAX. of 110F isn't supposed to be nearly enough of a swing to swell that epoxy or expand the foil. According to my contacts at
