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batch aqueous cleaning equipment

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#49334

batch aqueous cleaning equipment | 26 April, 2007

I am looking for a batch aqueous cleaning system and am looking for equipment recommendations. Thanks

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JD

#49350

batch aqueous cleaning equipment | 26 April, 2007

We've had our Aqueous Technologies 600-LD for four years or so now with just about zero problems... good luck in your selection

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#49352

batch aqueous cleaning equipment | 26 April, 2007

if you are looking for cost effective machine try a chinese made machine with many years of experience. We believed that it is much better than other brand. Please visit this site. http://www.kanpacific.com if you need more info. please contact me.

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#49355

batch aqueous cleaning equipment | 26 April, 2007

Batch cleaner * Aqueous Technologies, 9055 Rancho Park Ct, Rancho Cucamonga, CA 91730; 909-944-7771 F909-944-7775 aqueoustech.com * Austin American Technology; 12201 Technology Blvd, Austin, TX 78727; 512-35-6400 F512-335-5753 aat-corp.com * EMC Global Technologies; 4059 Skyron Dr, Doylestown, PA 18901; 215-40-0650 F215-340-1737 emcgti.com

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#49358

batch aqueous cleaning equipment | 27 April, 2007

Thanks for the help. In looking at these now I have questions on the recommended impact pressures. Is there a certain pressure recommended for certain types of devices? Does IPC or anyone call out recommended pressures for circuit boards?

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#49362

batch aqueous cleaning equipment | 27 April, 2007

I am pretty sure all mfg offer upgrades to the pumps inside these units. We upgraded ours to the 5hp pump and are very happy with it. A lot will depend on spray nozzle location and technology from Mfg to Mfg...

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#49409

batch aqueous cleaning equipment | 27 April, 2007

I do not know of any standard recommended values for impact pressure in cleaning equipment. They act more as a guide when examining the various choices manufacturers have made for the spray flow, nozzle pressure, nozzle spray angle and other factors.

As an example the Aqueous Technologies SMT1000 is listed with an impact pressure of 15.4 oz/sqin. Our ABC2500 has an impact pressure specification of 20.5 oz/sqin. Does this mean the ABC2500 will clean 30% better than the SMT1000? I don't see it that way. It is more of a guide to show that both of these machines are in the same class.

The impact pressure hopefully simplifies looking at the specifications of different machines. The SMT1000 has specs of roughly 6 gpm at 100psi with 20 spray nozzles at an angle of 15 degrees and the ABC2500 has 37 gpm at 26 psi with 32 nozzles at 35 degrees. With these numbers it is much harder to get a feel for the relative performance of these units. If we as manufacturers try to boil all these specs down to one number, hopefully it makes it is easier to understand.

Unfortuanetly this simplification starts to break down some as we move to the extremes. As an example 100 gpm at 2 psi with 35 degree nozzles gives an impact pressure of 15.5 oz/sqin. Will this combination clean just as well as the SMT1000 or ABC2500? I think you would find that the bottoms of the boards would not be clean because of the lack of nozzle pressure.

I hope I have helped your understanding of the impact pressure specification. To be above board I am an engineer with Unit Design, Inc. a manufacturer of aqueous batch cleaning equipment.

Steve Pence Unit Design, Inc. http://www.unitdesign.com

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#49429

batch aqueous cleaning equipment | 30 April, 2007

Let me chime-in regarding impact pressure.

By definition, impact pressure is determined by several factors: 1. The weight of the water (a constant) 2. Its velocity (determined by the GPM and nozzle�s orifice size) 3. The area impinged (determined by the spray angle and distance to target)

As you can see, one of the largest variables is the distance to target. In any practical batch cleaner there are huge differences between the board surfaces closest to the nozzles, versus the surfaces farther away (or shadowed by neighboring boards). Therefore, in many ways, impact pressure can be almost irrelevant. However, the decrease of impact pressure due to increasing distance is mitigated by using a narrow spray pattern. A pinpoint spray, for instance, has the same pressure regardless of the distance. A wide-angle pattern looses impact pressure greatly due to the rapidly increasing impingement area.

At Aqueous Technologies, our (patent pending) Focus-Wash technology uses relatively narrow 15-degree nozzles, for higher impact pressures at greater distances, combined with a moving, oscillating board rack, to provide complete coverage.

The original posting had asked for equipment recommendations. Both Steve Pence�s reply and mine are from a manufacturer�s point of view. Perhaps some actual users can provide Cross with some real world recommendations.

Ron Rumrill Aqueous Technologies

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#49452

batch aqueous cleaning equipment | 30 April, 2007

Cross: IPC nor anyone else calls out recommended pressures for washers used to clean circuit boards. IPC and the other standards setting folk are in the business of defining the expected results or outputs of processes or acceptance criterion. They believe [and correctly so] that it is the job of the process owner to define the necessary process parameters required to consistantly meet those criterion. This makes sense because it would be very difficult to define the process to meet the huge variety of possible process conditions.

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