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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


pasteprinting D.O.E.

#20216

pasteprinting D.O.E. | 4 June, 2002

We want to perform a "design of experiments" session to determine the optimum settings for our pasteprinter.We will design a stencil with decreasing aperture-sizes to make it measurable where the printing stops. The result should be a measureable printing quality. We think of : wieght before and after printing, or standaarddeviation of heightdifferences on, say 10 ubga-paste-dots per measurement. Any more suggestions how we can measure quality on pasteprinting?

reply »

#20221

pasteprinting D.O.E. | 4 June, 2002

Factors to consider are: * Squeegee speed * Squeegee pressure * Separation speed * Stencil thickness * Stencil aperture fabrication method * Stencil aperture shape * Paste type * Stencil under-wipe frequency

Search the fine SMTnet Archives for a thread on printing DOE done on CSP by rpereira.

reply »

#20234

pasteprinting D.O.E. | 5 June, 2002

Hello again, Indeed most of the mentioned factors we will use as variable parameters, and some of them we keep fixed.

I am interested in the way how to measure results.

Thanks for the hint to dig into former paste-printing threads; I will look at it.

reply »

#20240

pasteprinting D.O.E. | 5 June, 2002

First, I suggest that people search the SMTnet Archives in just about every response that I make.

Second, you need to work on your DOE jargon * Factors. Independent or input variables * Effects. Results. Dependent or output variables.

Third, the results of paste printing are nice looking bricks of paste. Evaluate these bricks in terms of: * Shape * Height * Volume * Area * Registration * Paste bridging

Measure those things with you standard printing process controls. You must use something like: * Microscope is the least costly [$5k] approach, but some would argue that the low price of entry is counter balanced by the need for structure and disciple of results measurement and the poor gauge r&r of the approach. * Laser guided measurement thing is the next level of spending, but some would argue that the relatively high cost [$25k] and lousy gauge r&r make this a dicey investment. * White light measuring tools work very well, but are not priced for the faint of heart.

We have droned on incessantly about paste measurement here on SMTnet. Search the Archives.

reply »

ianchan

#20247

pasteprinting D.O.E. | 6 June, 2002

Hi mates,

just to add-on, for DOE, also include squeegee printing direction as a factor.

Good Luck! happy DOE-ing.

reply »

Hussman69

#20262

pasteprinting D.O.E. | 6 June, 2002

Don't forget squeegee type and angle. (Am I an Ian wanna be or what?)

I'd leave out different types of solder paste.

For measurement, use something like a Cyber Centry. It may cost a little, but if you're serious, it's worth it. Other wise you may want to place and reflow parts and go by what the solder joints look like.

reply »

#20263

pasteprinting D.O.E. | 6 June, 2002

For solder paste print inspection critera, look here: http://www.ppm-monitoring.com/

reply »

#20268

pasteprinting D.O.E. | 6 June, 2002

Hussman,

What is a Cyber Centry? Who makes it? What does it do? What kind of accuracy does it possess? Cost? etc.

reply »

ianchan

#20272

pasteprinting D.O.E. | 7 June, 2002

Hussman69:

"wanna" be is for the spice girls, and I'd choose em' anytime!

reply »

pr

#20273

pasteprinting D.O.E. | 7 June, 2002

He ain't no spice girl, I can tell you that!!!!!!

reply »

Hussman69

#20274

pasteprinting D.O.E. | 7 June, 2002

Wow, slow down guys.

The Cyber Sentry (with an S - sorry) is a machine designed to just measure solder paste height, volume, etc. The first models used a laser, but the newer models are a little more sophisticated than that. They have tabletop versions as well as full blow in line units. I used em in the past but have mixed feeling on their value. They are a great tool for experimenting with, but not sure if I could justify an in line model. I'd rather buy an AOI machine - but that's just my feeling for what we're running today, with the process equipment we use. Tomorrow could change all that.

Their web site is: http://www.cytechnologies.com/produkt_lpast_e.html

Cost, I'm not sure, but I bet you could get a used one fairly cheap these days.

Spice Girls on SMTnet? Hmmmm.....is this a marketing teams dream come true?!

As for that PR fellow, I'm not sure what PC Board he crawled out from under, but you can bet it was all thru-hole!

reply »

Panasonic OEM Solutions

Heller Industries Mark 5获得了 2015年中国SMT远见奖 - 回焊炉领域