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July 2002

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Subject:
From:
Lee Whiteman <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 10 Jul 2002 11:03:42 -0400
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Steve,

I echo Dave's and Joyce's concerns about materials even with an
"electronics" cleaning system. I had gaskets, fittings, pieces of poorly
manufactured stainless steel plumbing, PVC exhaust ducts, tooling, etc.
dissolve when using various aqueous and semi-aqueous cleaning solutions and
DI water. This was on a process I implemented with a batch "electronics
cleaning system" which was a "dishwasher" type process (The names have been
changed to protect the innocent and not to embarrass the guilty).

If you're going to install a batch cleaning system, recommend that you get
the equipment manufacturer and the aqueous / semi-aqueous cleaning solution
manufacturer together to assure that they are compatible with each other.

Hope this helps. Good Luck.

Lee Whiteman
Senior Manufacturing Engineer
E-Mail: [log in to unmask] <mailto:[log in to unmask]>
Ph: (610) 362-1200 x208
Fax: (610) 362-1290



> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Steve Gregory
> Sent: Tuesday, July 09, 2002 9:08 PM
> To: [log in to unmask]
> Subject: [TN] Water soluble batch washers...
>
>
> Hi all,
>
> This is a little bit off-the-wall, and maybe sounds a bit cheap, but I'm
> going to ask anyway...
>
> We have a inline water soluble cleaner (an Electrovert H-500)
> that is located
> at one end of the plant. Problem is, that at the other end of the
> plant there
> is hand soldering (rework and touch-up) being done. As probably
> many of you
> have learned, operators don't want to make the trip all the way
> down to the
> other end of the plant to get their boards cleaned until they
> have a rack of
> boards that will make the trip worthwhile... which is
> understandable from a
> purely logistics point of view. But that sometimes results in the flux
> residues being left on the boards longer than what is desired.
>
> So the idea was brought up to get a couple of small batch
> cleaners closer to
> the area so that it would be so much of a trek to get the boards
> cleaned in a
> timely manner.
>
> Sounds like a good idea. My question is, most of the batch
> cleaners I've seen
> are glorified dishwashers. When you price these units you find
> that they are
> much, much more expensive than a dishwasher, but the operating systems are
> basically the same. I did a search for commercial dishwashers and can find
> nice beefy stainless constructed ones that have heated wash and
> rinse cycles,
> decent powered pumps, that are a third of the price that some of
> "specifically designed for printed circuit cleaning" washers cost.
>
> The wash nozzles are basically the same, rotating wands. Rack
> systems are the
> same, roll-in, roll-out racks that look very similar to what I've seen in
> every dishwasher I've ever had in my home.
>
> So my question is, has anybody ever had a real dishwasher in use to clean
> water soluble residues? We will supply DI water to them straight from the
> resin beds, and will be able to set appropiate cycle times to
> ensure thorough
> cleaning.
>
> >From my take on things, this should work pretty good without
> having to spend
> a bunch of money on a machine that can be had for much cheaper and not
> actually called "A printed circuit assembly batch aqueous cleaner"...
>
> Any comments?
>
> -Steve Gregory-
>
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