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Fill a stencil openings with what?!

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#56818

Fill a stencil openings with what?! | 5 October, 2008

Hi All!

I remember reading and seeing some (maybe Loctite) product which could be used to fill stencil apertures, but now when I need one, I cannot find it. Or anything like. Can some one please guide me? And with filling I mean permanent filling, no need to remove or re-open apertute again.

Thanks in advance,

harri

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#56838

Fill a stencil openings with what?! | 7 October, 2008

We use high temp (K&pton) tape on the bottom side of the stencil. This works well for us as an interim fix prior to replacing the stencil. I'd be interested to know if there are permanent methods of filling the apertures that can be done in-house.

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#56855

Fill a stencil openings with what?! | 8 October, 2008

Check with your stencil house. At one time I used a Panasonic screen printer with the fiducial camera looking at the top of the stencil. The stencils are cut from the bottom so the fiducials had to be cut all the way through. And the stenicl house would fill them with epoxy.

(well untill I started using offset fiducials.)

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#56864

Fill a stencil openings with what?! | 8 October, 2008

Steve hit it on the nose, use high temp kpton tape....we do the same thing. Cheaper.

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#56866

Fill a stencil openings with what?! | 8 October, 2008

We used to have fids filled with epoxy too, but they were never cut all the way through. It was just to blacken the mark better.

Are you sure they were actually cut through? I can't imagine something as brittle as epoxy holding as a filler with nothing but 4-6 mils of edge attachment to a flexible medium.

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PR

#56875

Fill a stencil openings with what?! | 9 October, 2008

Yep, they are cut all the way through and you are correct, they do not stay in there very long. Then when they pop out you wind up pasting the fids on your pcb, not ideal!

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#56885

Fill a stencil openings with what?! | 9 October, 2008

We use campton tape also but we use a ultasonic stencil cleaner and the tape will come off everytime its washed good luck

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#56889

Fill a stencil openings with what?! | 10 October, 2008

we use plain office tape, works perfect, it's thin and easy to remove afterwards.

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#56913

Fill a stencil openings with what?! | 14 October, 2008

We use masking tape - cheap as chips although you do have to replace it after washing. I have in the past used BLACK TAK from loctite. It was extremely expensive, and was supposed to be permenant. But after two/three washers through the cleaner it needed replacing.

Better off with masking tape!!!!

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