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September 1997

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Subject:
Re: pcb's manufacturing problems
From:
Ted Stern <[log in to unmask]>
Reply To:
[log in to unmask]
Date:
Tue, 23 Sep 1997 09:08:20 -0700
Content-Type:
text/plain
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text/plain (68 lines) 
Dear Albert:

To save time, I would forward you to the TECHNET ARCHIVES and a response
written by Paul Galatis (Electrochemicals) on July 1, 1997, titled
"Mousebites/divots".  To summarize, Paul suggested you investigate:

1. copper plating, and assure you are not supersaturating the copper
bath with air (CO2 to be more precise); and/or

2.  the developer, specifically the developing solution, which if not
properly controlled may result in underdeveloping or an exaggerated
resist "foot".

Both conditionsh will inhibit copper plating and may result in
"mousebites/divots".

Please feel free to contact me if you have further questions.

Regards,
Ted Stern
Circuit Research Corp.

Circuitos Impresos Profesionales S.A. wrote:
> 
> Dear Sirs,
> 
> First of all, let me introduce my company and myself.
> We are a pcb manufacturing company, called "CIPSA", and I am the Quality
> Manager. We are a company of 50 people and we produce pth pcb's and we are
> beginning to produce multilayers pcb's.
> The reason why I would like to put in contact with your organisation is
> because, lastly, we are having problems in the developing department. From
> time to time, we find out that a lot of tracks in the pcb are damaged or
> etched, doing like a little half-spheric hole. It occurs specially in the
> perimetre zone of the track.
> We think that it can be caused because of possibles products of developing
> such as anti-espumants ("anti-bouble"?) or others products, that remains on
> the board, because the rinse of our Schmid developing is not effective.
> Could you tell us if we are right ??
> Is there another possibility ??
> 
> Thank you in advance for your colaboration.
> 
>                                                 Albert Varón.
> 
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