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Solder Paste Printing

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#86507

Solder Paste Printing | 14 April, 2021

I am working with a CM in Taiwan and we are seeing significant differences between the paste printing bon the forward stroke vs the backward stroke. Print parameters are the same (pressure, speed, snap off speed) but there is a significant difference in the measurements from the SPI system. Any thoughts?

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#86508

Solder Paste Printing | 14 April, 2021

My first move is inspect the blades, swap the blades around and re-balance the blades to see if it is a problem that corresponds with a specific blade. Also try a different pair of blades. Full restart on the printer incase of an odd software problem. Make sure the board is secure while clamped in the print position.

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#86877

Solder Paste Printing | 22 July, 2021

SWAP blades from front to back. Make sure the tooling/ board supports are arranged correctly. Is this a foil stencil on a frame, or a complete framed stencil? I've had worn out foils that "roll" with the blade in one direction worse than the other. Are squeegee pressures the same? Maybe spin the stencil 180 degrees and the board, and see if the problem follows, or swutches.

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#86893

Solder Paste Printing | 2 August, 2021

You did not mention what is different in the results? Is it offset? Is it amount of paste? Paste height?

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#86896

Solder Paste Printing | 3 August, 2021

if blade swapping gives same result try swapping the pressure sensors.

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