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Reply To: | TechNet E-Mail Forum. |
Date: | Mon, 9 Jul 2001 11:35:13 -0400 |
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'twas Austin American Technology
http://www.aat-corp.com/
> -----Original Message-----
> From: Timothy Reeves [SMTP:[log in to unmask]]
> Sent: Monday, July 09, 2001 9:33 AM
> To: [log in to unmask]
> Subject: Re: [TN] Bare board cleaning
>
> FYI Larry,
> ECD sold its cleaner division to a company in Texas a while back and no
> longer makes washers. That division was up in Milwaukie (Oregon) and we
> (the board shop) are down in Mulino, about 15 miles south, so I wasn't
> directly involved with washers. That's why I don't remember who bought the
> cleaner division.
>
> Timothy Reeves
> QA Manager/Process Engineer
> ECD Circuit Board Division
> 13626 S. Freeman Road
> Mulino, OR 97042
> Tel (503) 829-9108 Fax (503) 829-5482
>
> [log in to unmask] <outbind:[log in to unmask]>
>
> <http://www.pcbpro.com/>
>
> -----Original Message-----
> From: Larry J. Fisher [mailto:[log in to unmask]]
> Sent: Friday, July 06, 2001 9:34 PM
> Subject: Re: Bare board cleaning
>
>
> 1. Many board shops will do a final clean operation (typically a
> saponifying
> heated detergent spray rinse, tap water and final DI water rinse),
> just prior
> to the boards being packaged and shipped to the customer. This is
> done to
> remove any contaminants that can arise from handling when the panels
> are
> routed into boards, electrically tested, etc.This is primarily
> done to make
> sure the boards are clean when they leave the board shop, look good
> and will
> meet ionic cleanliness requirements if a random sample is selected.
> You might
> want to contact your board supplier(s) to see if the do this final
> clean
> step. If so, you probably would not need a pre clean prior to
> assembling the
> boards.
>
> 2. There are some assemblers that do use dish washer type machines
> to clean
> fully assembled boards. In fact, ECD in Oregon makes a dish washer
> type
> machine specifically for cleaning assembled boards. The down sides
> are that
> the machines will only hold a few boards (no good for any kind of
> volume
> production), the cycle time is quite long (up to 1 hour - similar to
> a dish
> washer) and the assembled board is subjected to long exposure in a
> very high
> temperature/high humidity environment. I would think the solvent
> cleaning/vapor degreasing you are now using would be a better
> approach,
> especially with the RMA solder pastes you are now using.
>
> Hope this helps.
>
> Larry Fisher
>
> Allen Woods & Associates
>
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