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February 2006

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Subject:
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Brian Ellis <[log in to unmask]>
Date:
Tue, 21 Feb 2006 14:58:10 +0200
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text/plain
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I didn't know avian flue influenced the electronics industry :-)

Brian

John Burke wrote:
> 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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