Electronics Forum | Mon Aug 10 18:52:12 EDT 2020 | dunks
After the DI dishwasher cleaning, and before the final oven bake at 100C, we remove the large water deposits on assemblies with a pass from an esd blowvac. Is this a safe alternative to drying with compressed air?
Electronics Forum | Mon Aug 21 19:38:33 EDT 2000 | Dave F
Eric: I�ll pass on the uV and ammonia, also. Thoughts are: 1 You�re correct that the temperature/humidity mix can be a big driver to latex peelable solder mask cure time, but don�t overlook material thickness. Dispensers put material in a very th
Electronics Forum | Thu Aug 01 07:06:28 EDT 2002 | gdstanton
Just exploring options to improve wetting. It turns out our facilities dept is looking at an N2 generator to supply dry boxes. Thought it might be a good idea to assess whether we should expand the project to include reflow.
Electronics Forum | Mon Aug 12 19:35:42 EDT 2002 | sleech
Been there, ... done that,...got the T-shirt. When with a major IC manufacturer, we tried this. IT DIDN'T WORK! The problem was that most convection ovens leak. We could not achieve a significant N2 atmosphere.Eventually went to vacuum-assisted bak
Electronics Forum | Tue Aug 06 08:54:21 EDT 2002 | mike
I have two basic questions: 1. We have a number of small convection ovens and want to modify some of these for baking out parts when needed. We have tried pumping nitrogen into these but I still run between 35 and 50 RH. Has anyone tried converting a
Electronics Forum | Wed Aug 14 11:55:31 EDT 2002 | ksfacinelli
One thing we did for our oven is hook it up to the compressed air system in the factory and bled in a small volume of air to create a positive pressure in the oven. The air is clean (non-oiled) and comes off the dryer. We can attain 5% RH. Remembe
Electronics Forum | Wed Aug 14 13:54:54 EDT 2002 | DenM
Larry, You can try one of two approaches, a bake above 100C will drive off moisture or use a vacuum bake. The vacuum bake process is slow since there is less/no air to conduct the heat. In the hybrid industry the standard vacuum bake was 16 hours at
Electronics Forum | Wed Aug 14 16:30:55 EDT 2002 | sleech
Dan: Until I got deep into development of a vacuum assisted moisture removal process, I always thought that the bake process would be saddled by the lack of atmosphere in the chamber. I later learned that the conduction of temperature at reduced atm
Electronics Forum | Wed Aug 07 09:05:11 EDT 2002 | davef
N2 PPM vs %RH? With a firm grasp of the obvious, reflow oven manufacturers rig N2 ovens differently than non-N2 ovens. The N2 displaces O2. Usually N2 oven monitor something or other to give an indication of N2 ppm. %RH really isn't part of the eq
Electronics Forum | Wed Aug 18 22:01:35 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 scale board
