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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Dek printing issue

Views: 5227

#72993

Dek printing issue | 31 October, 2014

Having a problem with a DEK printer. In the back to front motion, getting poor ramdom paste volume on micro BGA pads. Other BGA 1 mm pads are fine. The front to back motion is fine. Any throufghts on this directional issue. Ran ~200 panels no problem , no set up changes or adjustments before problem cropped up.

Stencil?

Changed squeeges, recalibrated pressure, same paste, double vison alignment, grid locks checked.

Bill

reply »

#73000

Dek printing issue | 3 November, 2014

Looks like you did everything right. Clean and check carefully the stencil for damage close to the part you are having problem with. If not both of your squeegees should be damaged on the same spot.

reply »

#73002

Dek printing issue | 3 November, 2014

Nano Protec. It really works. Our operators swear by it. Get a sample from DEK and give it a ride on that stencil.

reply »

#73012

Dek printing issue | 5 November, 2014

Hi Bill, Contact Steve Yen with USA STENCILS INC. He'll help you out. He might need to know stencil thickness and type of solder paste, his contact as below. Steve@usastencils.com 714-636-6211

reply »

#73013

Dek printing issue | 5 November, 2014

Thanks for the contact info . I have the DEK process eng coming in.

reply »

#73045

Dek printing issue | 10 November, 2014

Dek Nano coating = Snake oil

reply »


nvn

#73400

Dek printing issue | 27 January, 2015

Hi,

I have same problem like this but i got the solution for my entire google search i hope you to follow this instructions from here.

http://driverbasket.com/

reply »

#73404

Dek printing issue | 27 January, 2015

Agree to disagree on Nano Protec. Have you used it and studied the results? We do 3D inspection and clean our stencils in the UT wash on a regular basis. Volume is better and we have to clean on a much lesser frequency when using Nano Protec.

reply »

#73416

Dek printing issue | 29 January, 2015

I agree with SWAG on this. Nano Coatings make a big difference on paste release. I found when placed on the topside of the stencil, it also helps to reduce stencil wear, though others complained that it affected the solder roll, so most stencil houses now apply it to the bottom side. (I didn't have any issues with the roll of the solder during printing when I placed it on the topside).

reply »

#73418

Dek printing issue | 29 January, 2015

I might agree with the type that is fused to the stencil. I do not agree with buffing on the stuff on that smells exactly like rain-X.

There is just not enough data.

reply »

#73441

Dek printing issue | 3 February, 2015

Oooooo, you're on to something. I might try rain-x instead. It's mucho cheaper. I wonder if it's ROHS?

reply »

Lead Free Wave Solder - 1 Click SMT

Reflow Ovens thermal process improvement