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February 2006

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Subject:
From:
Martin Butcher <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Martin Butcher <[log in to unmask]>
Date:
Fri, 17 Feb 2006 13:12:36 -0800
Content-Type:
text/plain
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text/plain (317 lines)
Sorry Ramon,

I couldn't help myself.
We actually have a very good "low" emissions coating room.

Regards,
Martin

-----Original Message-----
From: Dehoyos, Ramon [mailto:[log in to unmask]]
Sent: Friday, February 17, 2006 10:47 AM
To: [log in to unmask]
Subject: Re: [TN] [NTC]RE: [TN] Zero Emissions Spray Booth



        Hi Martin:
        That means that you are compressing flammable gases. The output
of CC spray booths are solids ( coating material ) and volatiles from a
flammable liquid ( i.e. Xylene ) that act as the CC carrier. Plus the
output of the spray booth is a lot more than the compressor needs and
most compressors duty cycle is not 100%. So there is time when the
compressor is shut off.  Estas jugando?
        Regards,
        Ramon


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Martin Butcher
Sent: Friday, February 17, 2006 1:13 PM
To: [log in to unmask]
Subject: [TN] [NTC]RE: [TN] Zero Emissions Spray Booth

We have side stepped this whole issue by simply connecting the output of
the fan directly to the input to our air compressor.  The filtration
system is more than capable of catching all of the air borne
contaminants...

-----Original Message-----
From: John Burke [mailto:[log in to unmask]]
Sent: Friday, February 17, 2006 9:08 AM
To: [log in to unmask]
Subject: Re: [TN] Zero Emissions Spray Booth


The height above the roof is very important. Too high and it will be an
aircraft hazard, too low and the pile of deceased pigeons on the roof
may eventually block the exhaust flow............8-)

Happy Friday TechNetters...

John

John Burke
Senior Manager - Operations , Optichron
[log in to unmask]
W: 510 249 5233
M: 408 515 4992
http://www.optichron.com
Profile: https://www.linkedin.com/e/fps/2665502/
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dehoyos, Ramon
Sent: Friday, February 17, 2006 9:01 AM
To: [log in to unmask]
Subject: Re: [TN] Zero Emissions Spray Booth

        Hi Doug:
                  What you mean is negative pressure. Air should pulled
from the end of the exhaust tube instead of pushed from the bottom. If
it is pushed, ( blower is over the hood ) the tube leaks will exhaust
fumes into the building which is bad. If it is pulled (blower on the
roof ) the tube leaks dilute the fumes more, which is good. By
regulations the velocity at exits has to be some many feet per second,
depending on the area and the end of the tube has to be some many feet
above the roof, to avoid fumes from accumulating on the roof.
        Regards,
        Ramon


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls
Sent: Thursday, February 16, 2006 11:01 AM
To: [log in to unmask]
Subject: Re: [TN] Zero Emissions Spray Booth

Amol,
In my opinion, "Zero Emissions" exists only in the minds of regulators
and salesmen.  What they are talking about is a positive air flow spray
booth that sucks all VOCs into one air stream.  That air stream becomes
subsequently filtered, usually through a charcoal medium, such that any
exhaust from the filter contains no VOCs or other regulated emissions.
If your spray booth exhaust is not filtered, even if properly permitted,
then it has emissions.

Doug Pauls
Rockwell Collins




             "Kane, Amol
             (349)"
             <akane@HARVARDGRP
To
             .COM>                     [log in to unmask]
             Sent by: TechNet
cc
             <[log in to unmask]>

Subject
                                       [TN] Zero Emissions Spray Booth
             02/16/2006 08:11
             AM


             Please respond to
              TechNet E-Mail
                   Forum
             <[log in to unmask]>
             ; Please respond
                    to
                "Kane, Amol
                  (349)"
             <akane@HARVARDGRP
                   .COM>






Dear TechNetters,
A question was recently asked by a customer whether we have a "Zero
Emissions Spray Booth" for conformal coating applications. We spray
polyurethane, acrylic, epoxy and silicon coatings. We have an exhaust
type spray booth to remove harmful vapors from the coating room. Can
anyone shed some light on the Zero Emissions Spray Booth concept so that
I can evaluate our existing infrastructure against the requirements and
make upgrades if necessary.

Thanks in advance,

Amol Kane
M.S (Industrial Eng.)
Process Engineer
Harvard Custom Manufacturing
941 Route 38  Owego, NY 13827
Phone: (607) 687-7669 x349
[log in to unmask]

 -----Original Message-----
From:   TechNet [mailto:[log in to unmask]]  On Behalf Of Dehoyos, Ramon
Sent:   Thursday, February 16, 2006 8:33 AM
To:     [log in to unmask]
Subject:        Re: [TN] BGA Reflow profile - Thermocouples

        Hi Dominic:
        It should not cost you much to find out what is the temperature
of a board through reflow. The investment of buying a Mole or other
similar device, that will allow you to record the profile of a board
through an oven is only "once". If you are using eutectic solder and
your coldest components sees 20 degrees over the melting point which is
203 C  and you are not exceeding the highest temp that the most
sensitive component may withstand, then you have a working profile, that
simple.
        Regards,
        Ramon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dominic Boudreau
Sent: Wednesday, February 15, 2006 5:50 PM
To: [log in to unmask]
Subject: [TN] BGA Reflow profile - Thermocouples

Hello Techneter's,

I am working on a procedure to make the reflow profile of a PCB.

What are the techniques to know where to attach the thermocouples on the
"PCB"? I already know that it should be where we have the coldest and
hottest spot but is it possible to know when we "must" test a BGA to
have a better reflow profile. We are a little company so we don't have
the money to test a BGA each time we have one on a PCB.



Thank you






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