Electronics Forum | Wed Oct 30 02:12:39 EDT 2019 | jags
yes and thanks for this feedback. we clean with degreaser ( strong) and flux is rosin with 10% in the paste (koki). we clean after second reflow . the gap time from bottom to topside completion is 10 hours. cleans with this time. my even after 20 h
Electronics Forum | Tue Oct 29 21:27:21 EDT 2019 | aqueous
It depends on the flux type. If it's water soluble, it should be cleaned soon after reflow because OA flux remains active after reflow. If it's rosin or no-clean (low-residue), then the only concern is the longer wait time, the more difficult it will
Electronics Forum | Tue Oct 29 04:40:42 EDT 2019 | jags
how long i can keep pcba after bottom reflow soldering to top side reflow soldering. like 12 hours or 24 hour or 48 hours........Enig board. leadfree soldering with 10% flux
Electronics Forum | Mon Nov 04 07:27:33 EST 2019 | amitthepcbguy
There are multiple methods where you can perform top and bottom reflow soldering simultaneously. With this method, you might not worry about the type of flux there is. Each part is covered and baked as per the requirement, while making sure there are
Electronics Forum | Fri Oct 21 14:13:08 EDT 2005 | mafc65
1.- Clean bottom and top stencil with a cloth/alcohol at same time.Pay special attention to fine pitch locations. 2.- Clean again bottom stencil side .To prevent any residual of solder 3.- Blow air with a air gun under the stencil to remove the solde
Electronics Forum | Mon Apr 01 20:25:48 EST 2002 | davef
Stop!!! Whoa!!! Time-aut You have equipment like "Siemens 80S & 80F, Sanyo TCM 3000 and GSM" and you're not going to convince people to clean the ever lovin' bejuice out of your stencils? You're thinking handy-wipes are going to get it done? Wha
Electronics Forum | Tue Jan 10 14:04:38 EST 2006 | Mike Konrad
Flashback time� Vapor degreasers, although still used in limited applications, no longer represent the conventional wisdom (due to multiple environmental issues). Aqueous-based technologies are the most common method of defluxing. Unlike most va
Electronics Forum | Tue Jan 10 20:39:06 EST 2006 | aqueous
Of course there are solvents which are less harmful to the environment than others. The operative phrase is �less harmful�. As a rule, water-based chemistries are �greener� than solvents. There are some solvent blends designed for aqueous-based eq
Electronics Forum | Wed Sep 08 03:08:05 EDT 2004 | peter016
Hi Everyone, I am new to this forum. I have posted a similar question on this subject (Chipmounter Plancement Speed). Does the 60% inclusive of the PM and Downtime ? I also find that line balancing also plays a part. For example the Universal GSM II
Electronics Forum | Thu Jan 31 13:19:28 EST 2002 | dason_c
What is the baking time/temperature standard for the PCBA before BGA rework?
