oven resin from adhesives

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I am currently running several SMT lines that are placing co... - Aug 13, 2002 by knightmck

The residues are from the flux, not adhesive. Do you have fl... - Aug 13, 2002 by

We don�t use this glue. What does Heraeus say about your co... - Aug 13, 2002 by davef

I hated no-clean for that reason. Yea, the boards are pretty... - Aug 14, 2002 by Fastek

Thanks for the replys'. So are you saying that SMD adhesive ... - Aug 14, 2002 by knightmck

No. Since most glues don't don't give-up many solids, we're... - Aug 14, 2002 by davef

no, the oven is only used for curing adhesive and has never ... - Aug 14, 2002 by knightmck

Wow. We've never seen that. You make a reasonable assu... - Aug 14, 2002 by davef

Is your exhaust duct connected to a reflow oven that is used... - Aug 14, 2002 by CarlN

uuumm, we have four lines in this particular part of the fac... - Aug 14, 2002 by knightmck

No. My ovens are vented on a seperate system. Any other idea... - Aug 19, 2002 by knightmck

I'm not found this problem with adhesive but found in NC f... - Aug 19, 2002 by FRANKY

I agree with analysis. You'll never accurately find the sou... - Aug 19, 2002 by

knightmck

#21128

oven resin from adhesives | 13 August, 2002

I am currently running several SMT lines that are placing components onto dispensed adhesive (Heraeus PD 944). My problem is that we have always had an issue with a resin type liquid �condensing� on the inside of our oven chimney and then running back down onto the oven. I always ensure the oven profile is correct (slightly above 150 for around 2 minutes) and have checked the exhaust flow rate, which is also adequate. What is causing this and can it be prevented? If not, does anyone have a good idea on how to clean out a 3 meter length of chimney?

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mick

#21143

oven resin from adhesives | 13 August, 2002

The residues are from the flux, not adhesive. Do you have flux management system in oven? You also need to check the flux type = can you use low solids. The effect is the same as steam in bathroom - it is cooling affects in exhaust and flux reforming from vapor state by condensing in stacks

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davef

#21150

oven resin from adhesives | 13 August, 2002

We don�t use this glue. What does Heraeus say about your condensate? [I'm With the previous poster. Your condensate sounds like goop from NC flux not glue.]

How to clean out a 3 meter length of chimney? Depends on your tolerance for pain * Take it and a handful of quarters down to the coin operated car wash and got to it. * Buy a new tube.

Consider adding a piece of flex tubing between your machine and your exhaust pipe. * Start you exhaust pipe, maybe a foot or so above your machine, doesn�t have to be lined-up. * Connect the machine and the exhaust with flex pipe that is so long that it touches the floor.

Consider checking with your reflow oven supplier to be sure your flux trap is working properly.

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Fastek

#21153