To all

I've been keeping out of this discussion.  But one thing I don't get... why
isn't the board industry looking at a fluxless process?

Carey

-----Original Message-----
From: Kelly M. Schriver <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Tuesday, January 04, 2000 2:52 PM
Subject: Re: [TN] cleaning flex circuits


>Hi Nancy -
>
>To begin with, the cleaning media is driven by the particular flux you are
>using.  This, in turn, will drive the issue of what equipment you may be
>able to use for the process.  I have had good success removing RMA residues
>from flex circuits with quite a number of blended solvents in vapor
>degreasers and conveyorized spray systems.  Size of the flex assembly must
>obviously be considered - there are a number of suppliers who can provide
>cleaning baskets to restrain small flexes for processing thru conveyorized
>cleaning systems.  Manual cleaning would not be my first choice if I were
>dealing with a high reliability article, particularly if it were to be
>conformal coated.
>
>Another possibility might be one of the saponifiers, in either a heated
bath
>or a "dishwasher"  type system.
>
>If you are not currently using a low residue ("no clean") flux, might that
>be a possibility?  If this is a consideration, and you plan to conformal
>coat or use adhesives on the assembly, be sure to verify full compatibility
>of the flux residues and the specific coating material you intend to use
>before proceeding.
>
>Contact me directly if I can be of assistance.
>
>Regards - Kelly
>
>
>
>
>-----Original Message-----
>From: Nancy M. H. Holloway <[log in to unmask]>
>To: [log in to unmask] <[log in to unmask]>
>Date: Tuesday, January 04, 2000 10:57 AM
>Subject: [TN] cleaning flex circuits
>
>
>>TechNet,
>>
>>   What is the best technique to clean flux off of a polyimide flex
circuit
>>after population?  Thus far, we have been cleaning the flex circuits with
>>alcohol but it is time consuming and tedious.  We use a machine to clean
>>rigid boards, but I am hesitant to use it for our flex circuits.  How are
>>you all cleaning your soldered flexible printed circuit boards.
>>
>>                                Thanks,
>>                                Nancy
>>
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