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The Knowledge and Know-how Connection
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May 24, 2013
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Max Idle Time After Print, Before Reflow
What is the maximum allowable time for a PCB after it leaves the screen printer but before reflow? We're using water soluble lead-free paste.
Board Talk is presented by ITM ConsultingVisit ITM Consulting to learn more.Phil Zarrow, ITM ConsultingWith over 35 years experience in PCB assembly, Phil is one of the leading experts in SMT process failure analysis. He has vast experience in SMT equipment, materials and processes. Jim Hall, ITM ConsultingA Lean Six-Sigma Master Blackbelt, Jim has a wealth of knowledge in soldering, thermal technology, equipment and process basics. He is a pioneer in the science of reflow.
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Views: 5241
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This is highly dependent on the solder paste formulation. We have a few brands that can withstand 24 hours between printing and placement of components. Some grades only leave a 6 hour window. Our typical minimum specification for any new development is 8 to 24 hours for no clean paste, 8 hours for water soluble paste.
Mitch Holtzer, Alpha Metals
Dear Click and Clack,
errr...I forget your names on the show!
Nice tribute to Car Talk, my favorite Saturday Morning radio show! Of course its my only Saturday morning show...
Anyway my question is I'm not clear what you do at 1" upside down. Do you tap it on the surface below, or just invert it? What is 90 degrees? And is the implicit assumption is that if parts fall off the paste is too dry to reflow?
Hope you guys are doing well in this challenging economy!
Bob Drake, Philips-Assembleon