Electronics Forum | Fri Apr 07 10:26:01 EDT 2000 | Ashok Dhawan
I have come across a number of cases where Solder Mask is chipped off or scratched. I was wondering this has anything to do with : **Packing of PCBs in stacks and vacuum sealed **Stacking of PCBs prior to print operation What is general practice i
Electronics Forum | Wed Feb 21 20:00:09 EST 2001 | davef
Sounds like you received some good advice. Most of our stencils are used once a day [at most], so more often than not they are air dried. If we goof-up and need to reuse a stencil during a day when we have limited drying capacity, we wipe the lowes
Electronics Forum | Wed Mar 07 02:29:22 EST 2001 | Cosine Theta
Barcode needs a light colour backgroup so that the scanner can read. No way you can mark on the solder mask and become readable. I found most of the time the investment cannot be paid back within 5 years. Most of the time it is product requirement th
Electronics Forum | Mon May 28 17:43:33 EDT 2001 | davef
Does this device have a integral heat sink / metal slug on top, like a TI TM320C6XXX er a Altera EP20K4XX? Compare the size of the pads on the interposer and the board. Compare the type solder mask [NSMD vs SMD] on the interposer and the board. Wh
Electronics Forum | Mon Dec 06 06:06:44 EST 1999 | Glen brian
Recently, my plant met the problem of bridging, a metallic link, lying on the solder mask and joining nearby joints. It is very diffcult to observe by our inspector and may be only discovered with ICT testing. This defect ocurrs randomly around the
Electronics Forum | Thu Aug 19 14:06:07 EDT 1999 | Stu Leech
| | | | We have developed a new process for removing moisture from surface mount devices. We have one site where PCB laminate drying has been reduced to 1.5 hours. A standard oven took 4 hours to do the job. I am looking for a firm who does large sca
Electronics Forum | Thu Aug 19 14:52:13 EDT 1999 | John Thorup
| | | | | We have developed a new process for removing moisture from surface mount devices. We have one site where PCB laminate drying has been reduced to 1.5 hours. A standard oven took 4 hours to do the job. I am looking for a firm who does large s
Electronics Forum | Wed Nov 07 17:06:56 EST 2001 | davef
Most of us, here on SMTnet, are either assemblers or sale types. Assemblers use stencils [metal foil, secured in a frame] instead of silk screens. Fabricators use silk screens in various photoimaging processes for applying etch resists, solder mask
Electronics Forum | Thu Jun 20 03:29:56 EDT 2002 | Josef
I would like to ask you for help. We use mixed technology and we need to protect SMT components in double Wave. Currently we use the carrier for protection of this component. In this case this procces is not possible to use it due to gap between SMT
Electronics Forum | Wed Jul 17 11:52:54 EDT 2002 | tmarc
Hello all, I have a question about OSP. The solder mask over traces leading to SMT pads, in some instances, does not cover all the way to the pad. Of course the stencil apertures do not include traces. After the SMT and reflow process, there is visib