Double sided reflow in one pass?

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Is there process by which one can do a double sided reflow... - Aug 16, 1999 by

| Is there process by which one can do a double sided refl... - Aug 17, 1999 by Doug Philbrick

Paul, I did a search using all three words "double side... - Aug 17, 1999 by Cunli

| Is there process by which one can do a double sided refl... - Aug 18, 1999 by

| Is there process by which one can do a double sided refl... - Aug 18, 1999 by davef

| | Is there process by which one can do a double sided re... - Aug 20, 1999 by

Paul Wareham

#10117

Double sided reflow in one pass? | 16 August, 1999

Is there process by which one can do a double sided reflow (SMT on both sides) in one pass through the oven?

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Doug Philbrick

#10118

Re: Double sided reflow in one pass? | 17 August, 1999

| Is there process by which one can do a double sided reflow (SMT on both sides) in one pass through the oven? | Probably not. I have heard people talk of it but never see it done and I wouldn't recommend it.

Good luck

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Cunli

#10119

Search the forum archives | 17 August, 1999

Paul,

I did a search using all three words "double sided reflow" in the archives and found 120+ postings, on both separate and simutaneous double reflows. Please repeat the search and let us know whether you find what you want.

Thanks,

Cunli

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Jason Gregory

#10120

Re: Double sided reflow in one pass? | 18 August, 1999

| Is there process by which one can do a double sided reflow (SMT on both sides) in one pass through the oven? | Paul,

Here's a way it might be done. Screen your bottom side with paste (if only passives, 0603-1206 & sot 23's), dispense glue for same said parts, screen topside with paste (watch your support pin placement, or other form of support-dependent upon machine, so you don't upset glue/paste), then place bottomside parts (again watch support placement). Then place topside components (again with the support). Run through your oven, passive bottomside facing down. As your board runs through the zones, the glue will "pre-cure", providing the tack needed, along with the surface tension provided by the paste as it's reflowing. This just might work. But it would scare the heck out of me. Better off just sticking to "conventional" methods. Cheers.

Jason

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davef

#10121

Re: Double sided reflow in one pass? | 18 August, 1999

| Is there process by which one can do a double sided reflow (SMT on both sides) in one pass through the oven? | Paul: Check Bob Willis' site (check the archives). Ta. Dave F

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k.t

#10122

Re: Double sided reflow in one pass? | 20 August, 1999

| | Is there process by which one can do a double sided reflow (SMT on both sides) in one pass through the oven? | | | Probably not. I have heard people talk of it but never see it done and I wouldn't recommend it. | | Good luck | |

Yes, it is do able in the lab environment. But when it comes to "real world" high to mide volume production it is not feasable. You be spending all your time baby-sitting and fixing screw ups than running productes.

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