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August 1999

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Subject:
From:
Mark Mazzoli <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 27 Aug 1999 06:14:05 -0400
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Hi Paul,

You can build an ammonia gas injection system the same way as you would
design a vent control system.  You can purchase electric gas valves to
activate ammonia cylinders via a pH controller.  But again, as in the case
of automatic vent control, the system will only be as good as the
maintenance put in around it.  These valves stick open or closed and can
cause a great deal of pain.  Not to mention the probe itself.  In this
environment they need plenty of care and preventive maintenance to keep them
calibrated.  As for oxygen introduction, most equipment I've been associated
with takes in enough oxygen from the conveyor's entrance and exit openings.
I've never had the need for an additional oxygen feed system.

I think the trick in creating a well balanced ammoniacal etch system is
machine design, placement of the venting, evenly matching the exhaust stacks
with the right fan size, relatively constant work flow, a VERY good specific
gravity controller for fresh etch feed and spent bleed, and a VERY good PM
program for keeping all of this maintained.  Not to mention good operators
who are well trained and know how to look after the systems.

I would suggest to Sarah, and anyone else looking for information on
ammoniacal etch systems, to contact Chuck Mosolf (Insulectro) and/or Marty
Leiberman (Phibrotech).  Marty is probably one of the most knowledgable
fellows I've ever met regarding ammoniacal etch systems.

Good luck.

Mark Mazzoli
Eng. Mgr.
Circuit Technologies, Inc.
3622 Clearview Pkwy.
Atlanta, GA 30340
770-458-1700
[log in to unmask]
----- Original Message -----
From: Paul Wilson <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, August 26, 1999 4:11 PM
Subject: Re: [TN] etching pH controllers


> It would seem that vent regulation could be used to control pH; however,
> what then happens to the fine control of chlorides?  The reason this is
> asked is vendor etchant contains varied amounts of ammonia gas (i.e.,
> control of one means loss to the other?).
>
> How about ammonia gas controllers and oxygen input devices with fixed
vents
> for chloride regulation?  Where are these purchased?
>
> Thanks,
> Paul Wilson
>
> -----Original Message-----
> From:   Sarah Boutwell [SMTP:[log in to unmask]]
> Sent:   Thursday, August 26, 1999 11:44 AM
> To:     [log in to unmask]
> Subject:        [TN] etching pH controllers
>
> Hello everybody
> I would like to add a pH control system to my ammoniacal copper etcher
that
> would open and close a vent based on the pH of the bath.  Does anyone know
> of a company that supply me with something like that?
> Thanks
>
>
> Sarah Boutwell
> Manufacturing Engineer
> Johnson Matthey Advanced Circuits
> [log in to unmask]
> 612-684-5079
>
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