So, what would be an excellent educational topic is how one would arrive at
the optimal set of cleaning parameters for a product. Not all cleaning
processes are created equal.
*Douglas Pauls *| Principal Materials and Process Engr | Advanced
Operations Engineering
*COLLINS AEROSPACE*
400 Collins Road NE, MS 108-101, Cedar Rapids, IA 52498 USA
*Tel:* +1 319 295 2109 | *Mobile: *+1 319 431 3773
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On Wed, Feb 26, 2020 at 12:34 PM Stadem, Richard D <[log in to unmask]>
wrote:
> Well, there are batch cleaners, and there are batch cleaners.
> I have a TDK inline cleaner here at GD, as well as four other batch
> cleaners.
> The Stoelting batch cleaner I use both here and in Norway are just
> absolutely fantastic. They work really well, albeit they take a little
> longer than the inline cleaner.
> In my nature of work, operators do not get to pick and choose which
> cleaning machine they get to use, however.
> We use a saponified wash process in the batch cleaner at a 5% Bioact
> terpene mix ratio for RMA cleaning, and it works extremely well.
>
> -----Original Message-----
> From: TechNet <[log in to unmask]> On Behalf Of Watson, Howard August
> Sent: Wednesday, February 26, 2020 11:40 AM
> To: [log in to unmask]
> Subject: Re: [TN] [External] Re: [TN] Cleaning Course of Study
>
> Dean,
>
> I like your ideas especially relating to batch cleaners. We got a batch
> cleaner (closed loop) a few years ago, and I think that everyone thought it
> was "plug and play". It didn't yield the results expected, and so it just
> sat there unused. No one trusted it, so they went back to solvent bench
> cleaning.
>
> Thanks,
>
> Howard A. Watson
> __________________________________________
> Intelligence & Space Research Division, ISR-5, TA-03-2322-504 Los Alamos
> National Laboratory
> 30 Bikini Atoll Road, MS B261
> Los Alamos, NM 87545
> Phone: 505-665-3402
> [log in to unmask]
>
>
>
> -----Original Message-----
> From: TechNet <[log in to unmask]> On Behalf Of Stadem, Richard D
> Sent: Wednesday, February 26, 2020 9:56 AM
> To: [log in to unmask]
> Subject: Re: [TN] [External] Re: [TN] Cleaning Course of Study
>
> Some more:
> How a typical DI tank farm or system works, maintenance of the DI tanks,
> chemical treatment for microbial or bacterial issues with the municipal
> water supply. (Ain’t I a fun gi?, LOL) Considerations for water use, and
> the monitoring thereof.
> Local environmental laws, regulations, and ordinances related to release
> of wash water into municipal waste treatment systems, permits required, COD
> testing or other waste testing that may be required, why it is a good idea
> to establish a personal relationship with the local environmental waste
> office and how they are a valuable resource in how to deal with spent
> de-scaling compounds, etc.
> How to safely dispose of salamander eggs, tadpoles, minnows, water
> spiders, LSD, and prohibited weeds from the local water supply.
>
> Which brings me to Maintenance:
>
> Review of the cleaner’s maintenance program, is it up-to-date and is it
> sufficient? Do the PM intervals make sense for daily, monthly, yearly or
> semi-yearly procedures? Is it being performed as defined? Does the machine
> require de-scaling periodically? Are safety procedures in place that are
> applicable to Maintenance (tag-out, power-down, personal protective
> equipment when working around chemical de-scaling compounds and other
> chemicals, etc).
> Proper documentation of daily mix verification or verification of water
> pressure, water temperature, rinse temperature, belt speed, etc.
>
> I’ll keep thinking, I am sure there is more.
>
> Odin
>
>
> From: Douglas Pauls <[log in to unmask]>
> Sent: Wednesday, February 26, 2020 10:30 AM
> To: TechNet E-Mail Forum <[log in to unmask]>; Stadem, Richard D <
> [log in to unmask]>
> Subject: Re: [External] Re: [TN] Cleaning Course of Study
>
> An excellent set of points. Thank you Odin. I especially like #5. A
> corollary would be not to use the reflow oven as a pizza oven.
>
> Douglas Pauls | Principal Materials and Process Engr | Advanced Operations
> Engineering COLLINS AEROSPACE
> 400 Collins Road NE, MS 108-101, Cedar Rapids, IA 52498 USA
> Tel: +1 319 295 2109 | Mobile: +1 319 431 3773 [log in to unmask]<
> http://collins.com>
> [log in to unmask]<mailto:
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>
> On Wed, Feb 26, 2020 at 10:27 AM Stadem, Richard D <
> [log in to unmask]<mailto:[log in to unmask]>> wrote:
> I think it is critical to train in the basic fundamentals, as applicable.
> Handling after the wash is critical;
>
> 1. Ensure a good blow-off of any remaining water is performed, and explain
> that even after a good wash and rinse, CCAs should never be allowed to sit
> with standing water that can evaporate, leaving behind white residue in the
> form of suspended flux particles, minerals, etc. This is applicable to most
> in-line cleaners, perhaps not for many batch (non-conveyor) cleaners which
> typically perform a drying function within the chamber at the end of the
> final rinse. A good blow-off or drying cycle takes any remaining
> contamination off of most of the CCA with the leftover water.
> 2. Never package wet CCAs directly into closed ESD boxes, bags, or other
> packaging. This ensures creep corrosion, etc., etc,.
> 3. A section on saponifier mix verification, typically done with in-situ
> process analyzers, or whatever method the saponifier manufacturer
> recommends. Information on how the ventilation of the cleaner can cause
> changing mix ratio levels, etc 4. Matching of the cleaning process for the
> flux(s) used. Considerations to be given to using batch cleaning with an
> appropriate saponifier or solvent for non-water soluble fluxes, and perhaps
> an in-line conveyorized machine for soluble. Or vice-versa, dependent on
> the typical product mix.
> 5. Why the cleaning process should ONLY be used for cleaning fluxes and
> "normal" soils, and not for cleaning carburetors, smocks, removing of the
> wrong adhesive (uncured), cleaning of newly-machined shop fixtures/tools
> covered with silicone-bearing cutting grease or oils.
> 6. Prevention of silicone contamination in general. Nothing like an
> operator cleaning heatsink grease as part of a rework procedure to screw up
> your wash process permanently. Just try coating boards after they have been
> washed in a silicone-contaminated cleaner. Such fun!
>
> I will think of more, whether you like it or not, LOL!
>
> dean
>
>
> -----Original Message-----
> From: TechNet <[log in to unmask]<mailto:[log in to unmask]>> On Behalf Of
> Douglas Pauls
> Sent: Wednesday, February 26, 2020 6:43 AM
> To: [log in to unmask]<mailto:[log in to unmask]>
> Subject: [TN] Cleaning Course of Study
>
> Good morning Technetians
>
> OK, so I have been thinking (and we know how dangerous that is) about
> developing a course of study for someone to become a "cleaning expert".
> Something along the lines of starting with a new hire and educating the
> new hires up to my level. Courses would include things like flux chemistry,
> cleaning processes and chemistry, cleanliness measurement methods, SIR
> methods, etc. What items would you suggest be added to the course of study?
>
> *Douglas Pauls *| Principal Materials and Process Engr | Advanced
> Operations Engineering
>
> *COLLINS AEROSPACE*
>
> 400 Collins Road NE, MS 108-101, Cedar Rapids, IA 52498 USA
>
> *Tel:* +1 319 295 2109 | *Mobile: *+1 319 431 3773
>
> [log in to unmask]<mailto:[log in to unmask]>
>
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