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 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 | Mon Jul 29 21:41:22 EDT 2002 | davef
Rite. Moisture, not N2, in the air is the issue.
Electronics Forum | Wed Nov 08 20:18:26 EST 2000 | Dave F
The style of US standards has been moving away from such specifications for some time. So, the approach has become ... Here�s what I want ... Functioning, built to print, clean, undamaged boards. Here�s how I want you to do it ... I don�t care, jus
Electronics Forum | Tue Nov 28 22:34:55 EST 2006 | davef
Almost all boards are hydroscopic. In this, the epoxy holding the board together absorbs moisture. Almost all components are hydroscopic. In this, the epoxy encapsulating the component together absorbs moisture. So, as you heat the board / compon
Electronics Forum | Sat Jul 14 10:34:42 EDT 2001 | davef
This portion of SMTnet is intended for people whining about the operation of the forums and what-not. A lot of the people asking questions like your use the production forum. We don't have an air knife on our wave, but I recall some threads on SMTn
Electronics Forum | Tue Jun 05 20:25:27 EDT 2001 | davef
Sorry that I'm so late responding. Your new additon probably has 'backee stains on the floor already. Assuming we're talking about a fairly standard board assembly area, you don't need to specify air quality. 1 We specify * Particulate: Level to b
Electronics Forum | Mon Apr 25 02:25:32 EDT 2005 | Mike Konrad
The issue of using ultrasonic technology for post reflow de-fluxing presents challenges in two categories: Controversial: Although there are recent studies that indicate acceptance with ultrasonic technology on populated assemblies, there remains si
Electronics Forum | Tue Apr 11 17:45:02 EDT 2000 | Ashok Dhawan
I am looking for an appropriate method to dry wave soldered boards. While board assemblies are passed through board cleaning station , they are not fully dry . We do not want to heat above 180 deg F to dry them completely. We think that air drying u
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