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Cleaning of misprints

Views: 1385

#70056

Cleaning of misprints | 26 July, 2013

We are looking at buying a dedicated machine for cleaning misprints. Does anyone have any experience with Smart Sonic or the other manufacturers?

Any feedback is appreciated.

Thanks

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#70093

Cleaning of misprints | 29 July, 2013

We used to scrape off the paste with a plastic putty knife and then place the boards in our Smart Sonic stencil cleaner that we used to clean the stencils in. It worked well.

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#70095

Cleaning of misprints | 29 July, 2013

Is there any particular reason you're looking at getting a dedicated machine?!

The first question that pops to mind is...are you having so many mis-prints that you need dedicated equipment at the site to mitigate the issue? If so, I know you've been around enough to start looking at improving your printing process, rather than putting a dedicated (expensive) bandaid in place.

The second question is, why not just use your current wash process? If you're using water soluble paste, send the board down the wash process, and get it back to the print process after drying (but do ensure it's quite dry, you don't want any excess moisture interfering with your paste or explosively outgassing in reflow!).

Cheers. ..rob

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#70096

Cleaning of misprints | 29 July, 2013

You can just get any ultrasonic bath - the ones they use for jewelry will work. Just get the right size based on your largest boards.

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#70097

Cleaning of misprints | 29 July, 2013

We want a dedicated machine because we have some concerns with SMT adhesive residue that is in the bath contaminating boards. We are getting pretty heavy into class 3 so everything has to be pretty much perfect. We run 2 shifts and have 5 lines so when the SPI machines find failures or someone puts their thumb in a board etc etc.

We run very little water wash paste.

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#70100

Cleaning of misprints | 29 July, 2013

Ahh...now I understand.

So much for any of my solutions :)

cheers, ..rob

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