Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


screen printing adhesives

Chad Barnett

#9968

screen printing adhesives | 24 August, 1999

JUST WANDERING IF ANYONE IS PRINTING ADHESIVE ON THE BOTTOM SIDE OF BOARD WITH THROUGH HOLE COMPONENTS ALREADY PLACED. I'VE BEEN TOLD IT IS POSSIBLE BUT WANT TO LOOK INTO THIS PROCESS IN DEPTH.

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#9969

Re: screen printing adhesives | 25 August, 1999

| JUST WANDERING IF ANYONE IS PRINTING ADHESIVE ON THE BOTTOM SIDE OF BOARD WITH THROUGH HOLE COMPONENTS ALREADY PLACED. I'VE BEEN TOLD IT IS POSSIBLE BUT WANT TO LOOK INTO THIS PROCESS IN DEPTH. | Chad: You don't need to YELL!!!

Anyhow, yes we have printed glue after PTH component insertion. We used a plastic stencil with pockets milled into the board side that matched-up with the PTH component leads. This allowed printing with no snap-off.

This takes a lot of putzing to get the proper sized deposit, because the stencil ends-up being thick, which makes for small apertures and the release that's not so good.

Ta

Dave F

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