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SMT electronics assembly manufacturing forum.


Inline Washers

#23545

Inline Washers | 27 February, 2003

Hi,

I am looking for opinions on closed-loop inline washers.

We use water-soluble paste and flux, most of our boards are double-sided, and our finest pitch is 16mil, but we will be doing BGA, uBGA, and possibly flip chip in the future. What would be your recommendation of the following inline washers and what options are highly recommended? I have chosen these washers due to space constraints (<20�).

Austin America Hydrojet Mach I Electrovert Aquastorm 90 Technical Devices Nu/Clean 318 Trek Triton

If I have left anyone out you think I should consider please let me know.

Your input is greatly appreciated.

James

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#23551

Inline Washers | 27 February, 2003

James,

Have you considered going to a No-clean process? BGA's can be difficult to impossible to clean using an aqueous process. The water just won't penetrate under the entire BGA and efficiantly remove your flux residues. The tighter the pitch, and smaller the balls, the less ability the water has of penetrating past the the first few rows. The way I understand it is the surface tension and water droplet size cannot penetrate into the very confined spaces under your uBGA. There are a number of very good no-clean solder pastes. Most of these pastes can drop into your process a lot easier than specifying, and purchasing a new inline washer, with it's associated water treatment and DI systems.

Alan

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Matt Kehoe

#23554

Inline Washers | 27 February, 2003

We use an Aqueous Technologies Millennium III closed loop system. The footprint is no more than 12-13 feet. We wash water soluble solder paste residue with excellent results however, due to the nature of our solid solder deposit process, we are washing bare boards, no components in the way. Obviously this is easier than washing boards with components mounted. We do not use any additives in our system other than the occasional de-foamer.

The filters produce DI water and when the water in the machine gets dirty we just pump it into an evaporator out back and re-fill it. Simple set up.

Good luck,

mk

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#23556

Inline Washers | 27 February, 2003

Alan is spot on.

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James

#23559

Inline Washers | 27 February, 2003

We need to use water-soluble paste due to cleanliness requirements. No-clean does not mean No-contamination. I have talked to a lot of people who use no-clean and they still wash their boards except now they have to use chemicals to do it.

So, you guys on the no-clean bandwagon are not going to convince me and I won�t convince you.

I know if we do uBGA and chipscale I may need to add a saponifier to the wash or at that point I may do no-clean for those products.

I am really looking for opinions on inline washers not alternatives.

Thanks

James

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Matt Kehoe

#23560

Inline Washers | 27 February, 2003

James,

Could I get some contact info for you to call you about this?

There is a solution for clean BGA's that needs to be discussed one on one versus here in the forum.

mkehoe@sipad.net 770-475-4576

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RDR

#23562

Inline Washers | 27 February, 2003

James, The last time I evaluated in-line cleaners (2 yrs ago)the Aquastorm was by far the best. They were the easiest to maintain, acheived the highest cleanliness level (per in-house testing with omegameter 600 heated solution), and were the quietest, Get the highest horsepower pumps! with these we processed uBGAs (and everything else)quite frequently with OA fluxes and daily testing showed extremely clean boards (0.0 ug/NaCl per sq.in.)

I should note that I did not eval any of the other units that you are pondering. I have used equipment from these manufacturers before exept TREK.

In my opinion I would rate them from best to worst

Electrovert Austin America - had stencil cleaners etc.. worked fine

A couple of empty spaces here, in my opinion Austin and electrovert are far ahead of T.D.

Technical Devices - Had a wave solder machine. Pretty poor engineering and design on the units I used

Hope this helps

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#23574

Inline Washers | 28 February, 2003

Cookson Electronics Equipment- Electrovert AquaStorm 200 highly recommended options: Checkmate Conveyor Hurricane Jets in Wash and Rinse 4 Additional Top Spray Bars in Wash *Closed Loop Filtration System for Wash *Positive Displacement Chemical Metering System ChemicalIsolation Level 3 Aqua-Loop closed loop filtration system for Rinse TorridZone Dryer if you desire a "test ready" product out of the cleaner, otherwise go for SCAT option in Dryer 1 & CAT option for Dryer 2.

*- if cleaning no-clean

This configuration cleans no-clean flux residue from under devices with 3mil gap at a conveyor speed of 1.5 ft./min.

for info, go to http://www.cooksonee.com

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Dean

#23727

Inline Washers | 9 March, 2003

Definitly evaluate the TD washer smt 324 / 318. I have two units and they have been fantastic from a maintenance point of view.

Small, quiet and easy to maintain.

I am in the middle of cleaning capability and ionic contamination testing as we speak. So, I can not comment on its cleaning capability.

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#23732

Inline Washers | 10 March, 2003

James: So, why don't you clean your no-clean? At least then you stand a chance of doing class 2 and class 3 work.

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Tim Chistianson

#23742

Inline Washers | 10 March, 2003

Good note about in Line washers. Can you tell me a little more about the Wave machines, may be what models did you worked on, and what you liked or did not like about them. Thanks, Tim

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julief2000

#23745

Inline Washers | 10 March, 2003

James,

I am not a cleaning technician. My company buys and sells mostly used capital equipment. I can tell you from a service point of view, Technical Devices is the most highly recommended of the companies you are considering. They are always available to me for setting up their used machines and giving support to our customers who are always pleased with their cleaning results.

Check out their cleaner at: http://www.technicaldev.com/cleaners.html

Check out their customer service at: http://www.technicaldev.com/customerfeedback.html

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#23752

Inline Washers | 11 March, 2003

Dave,

Not sure if I understand the question.

We do not process No-Clean in our facility at the current time. We are a completely Water-Soluble with a 12 year old Hollis Polyclean In-Line washer. I need to scrap the piece of ****.

That's another question, how do you go about scapping a machine that has been contaminated by lead?

James

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#23754

Inline Washers | 11 March, 2003

Check with your state EPA on disposal of lead contaminated equipment. Or, your local Sanford & Son can handle it.

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RDR

#23771

Inline Washers | 11 March, 2003

Tim, I cannot remember what model our T.D. wave was it was a small unit about 8 ft. long "tabletop" is what I call them. In keeping up with this thread I noticed a lot of T.D. support. So, I decided to backtrack and review history with my previous peers at the company we all worked for and found out some more info on the wave that we had. Apparently this wave came from a refurb shop or something and they "hacked it up" to make it work from a previous inoperable state. So, first off let me appologize for the "slam" on T.D. engineering since it was out of ignorance. Just for the record, the wave I had utilized flimsy chains to support the upper preheater, the conveyor was welded into place at a 2 deg. angle., the chip wave would pour solder onto the floor since it was located about 2 in. from the edge of solder pot, and the input guides were not adjustable and misaligned. So from my standpoint at that time it appeared to me that this was a machine that was put together with any parts on hand and I mistakenly thought that this was a production model. So everyone please disregard my comments on T.D. and I would recommend to the original poster that he/she evaluates T.D. (I still highly recommend the Aquastorm however)

Now Tim if you were interested in all of the wave machines I have operated they have been Electrovert EPK, UPK, Sensbey LG series, ATF (tabletop), and hollis. I will rate them if you would like since I am absolutely sure that these were not hack jobs.

Russ

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#23781

Inline Washers | 12 March, 2003

I would like to thank everyone for their input, it has been very helpful.

James

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bmaheu

#23853

Inline Washers | 20 March, 2003

James,

I've done some extensive studies cleaning BGA's while I was employeed by one the companies you are considering. In an attempt to avoid being commercial I will use general statments to address your question(s).

The key to cleaning underneath BGA's is efficient penetration and then effective water displacement. A combination of spray nozzle configuration, pressure, flow, water quality, temperature and dwell time will generate excellent cleanliness results.

The pre-wash and initial wash section should include a high flow, atomizing spray configuration. The smaller water droplets and high flow rates will cause the water droplets to penetrated into the center of the BGA ball pattern. High pressure, high impingement force nozzle (jet) should be applied to displace the water from within the center of the BGA. The water from the pre-wash will solubilize the flux and the high velocity jet will displace the flux entrapped water.

Note: The speed of the belt will control the dwell time in the wash section. Obviously the slower the belt the more time the wash section will have to remove the flux residue.

Water quality, temperature, and pressure are contribute the efficiency of the cleaning process. Older cleaning systems were not designed to clean underneath SMT components and therefore do a terrible job.

I would recommend a system with a 10 HP pump in the wash section with appropriately designed spray nozzles. Keep in mind pump horse power ratings do not translate into effective cleaning results. The key to effective BGA penetration is not big pumps, but an efficient methods of delivering kinetic energy to the center of the BGA.

Good luck!

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