Just a note, some of those systems put vacuum into the chamber during
the reflow cycle to remove air voids etc.
For those that have not seen one, the process is quite the piece of
engineering. The board is on a carrier, the carrier is placed by the
carrier handler onto a flat base plate in the reflow zone. Once the
board is up to temperature a chamber comes down over the board and
carrier and seals to the base plate ( the chamber that comes down is in
effect a 5 sided box with a seal around the open face and an outlet tube
on the opposite side with a vacuum tube attached). Then the vacuum is
applied, the vacuum is then released, the chamber withdraws, and the
handler finishes the rest of the cycle delivering the resulting boards
with very nice void free solder joints.
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 Mike Fenner
Sent: Wednesday, April 12, 2006 9:32 AM
To: [log in to unmask]
Subject: Re: [TN] RD Technologies Vapor Phase Users
I offer the following additional comment on VPR as a technique not to
any
specific machine.
The latest generation VPR machines are much better than the 1980's
types.
However you do need to be a little sceptical of some of the claims for
some
machine types.
Yes the delta t at peak reflow is less, it's inherent in the process and
makes VPR a good choice for prototypes, low run builds or assemblies
with
acute or odd thermal loadings.
But
What about the ramp up? some machines do not address this very well,
particularly on the second board.
VPR is claimed to be anaerobic but that is only true after a time in a
fully saturated vapour system (when all air has been replaced by the
vapour), if the machine
Depends on a variable vapour concentration for heating profile it can't
be
saturated.
At the same time the condensation is possibly going to be variable on
the
ramp up according to component or local mass so the big claim of VPR for
low
delta T can be some what overstated when considering the process as a
whole...
Actually there is always going to be some air in the reflow zone, the
best I
ever measured (on the 180s machines admitted) was about 100-150 ppm
oxygen
equivalent, be interesting to know what users are actually getting.
The capacity of VPR for very rapid uniform heat transfer with little
mechanical stress can not be over estimated, (up to 50C/second is
possible)
but if this is taken advantage of on soldering then the flux volatiles
will
demonstrate that property dramatically. Conversely this is facility is
good
for curing polymers /adhesives.
Regards
Mike Fenner
Indium Corporation
T: + 44 1908 580 400
M: + 44 7810 526 317
F: + 44 1908 580 411
E: [log in to unmask]
W: www.indium.com
Pb-free: www.Pb-Free.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jason Gregory
Sent: 11 April 2006 18:38
To: [log in to unmask]
Subject: Re: [TN] RD Technologies Vapor Phase Users
Hi Ramon,
Pros:
-Ability to process problematic high temp boards (thicker than .063",
high
layer counts, etc.) and not have to jack with as many variables as in
convection or IR -Excellent thermal equilibrium across the assembly and
not
having to worry about shadowing or thermal thieving -Probing your board
to
determine preheat and then knowing your peak area's temp already and
looking
through a little window to observe reflow and giving an extra 15 or 20
seconds over for wetting
Cons:
-Fluid is expensive and if you have excess dragout, you will notice
financially. Fluid is about $1000/gallon -Higher than usual expectations
for
tombstoning if your board design is a little lopsided (heavy ground
planes
connected to one side of passives) or if your process is a little off.
-Machine is a booger to clean
Jason Gregory
Manufacturing Engineer
Innova Electronics
(281)653-5593
(281)653-5594 fax
(281)594-0602 cell
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dehoyos, Ramon
Sent: Tuesday, April 11, 2006 11:36 AM
To: [log in to unmask]
Subject: Re: [TN] RD Technologies Vapor Phase Users
Hi Jason:
I believe that Vapor phase has a lot of good merits.
Could you share your experience with the machine? Pros and Cons.
Regards,
Ramon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jason Gregory
Sent: Tuesday, April 11, 2006 12:13 PM
To: [log in to unmask]
Subject: Re: [TN] RD Technologies Vapor Phase Users
Hello Steve,
We have a RD here and we use Galden HS-260
Jason Gregory
Manufacturing Engineer
Innova Electronics
(281)653-5593
(281)653-5594 fax
(281)594-0602 cell
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Tuesday, April 11, 2006 10:33 AM
To: [log in to unmask]
Subject: [TN] RD Technologies Vapor Phase Users
Mornin' All!
I've just got the opportunity to work with a new vapor phase reflow
system
here at my new position. It's a RD Technologies RD3 with a vapor
recovery
system. We're in the process of hooking it up, we haven't yet started it
up.
I worked with a vapor phase many years ago (1988), and this system is
much
nicer than what I remember about the system I worked with in the past.
I was wondering if there are any RD Technologies users out there that
have
any "words of wisdom" that they might share with me about the system I'm
that going to be working with. BTW, we're going to using Galden heat
transfer fluids.
Kind regards,
-Steve Gregory-
Senior Production Engineer
OAI Electronics
6960 East 12th Street
Tulsa, Oklahoma 74112
(918) 836-0507
(918) 706-2779 CELL
(918) 836-0184 FAX
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e To
unsubscribe, send a message to [log in to unmask] with following text in
the
BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or
(re-start) delivery of Technet send e-mail to [log in to unmask]: SET
Technet
NOMAIL or (MAIL) To receive ONE mailing per day of all the
posts: send e-mail to [log in to unmask]: SET Technet Digest Search the
archives of previous posts at: http://listserv.ipc.org/archives Please
visit
IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for
additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e To
unsubscribe, send a message to [log in to unmask] with following text in
the
BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or
(re-start) delivery of Technet send e-mail to [log in to unmask]: SET
Technet
NOMAIL or (MAIL) To receive ONE mailing per day of all the
posts: send e-mail to [log in to unmask]: SET Technet Digest Search the
archives of previous posts at: http://listserv.ipc.org/archives Please
visit
IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for
additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e To
unsubscribe, send a message to [log in to unmask] with following text in
the
BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or
(re-start) delivery of Technet send e-mail to [log in to unmask]: SET
Technet
NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send
e-mail to [log in to unmask]: SET Technet Digest Search the archives of
previous posts at: http://listserv.ipc.org/archives Please visit IPC web
site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e To
unsubscribe, send a message to [log in to unmask] with following text in
the
BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or
(re-start) delivery of Technet send e-mail to [log in to unmask]: SET
Technet
NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send
e-mail to [log in to unmask]: SET Technet Digest Search the archives of
previous posts at: http://listserv.ipc.org/archives Please visit IPC web
site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------
***This email, its content and any files transmitted with it are
intended solely for the addressee(s) and may be legally privileged
and/or confidential. If you are not the intended recipient please delete
and contact the sender by return and delete the material from any
computer. Any review, retransmission, dissemination or other use of, or
taking of any action in reliance upon, this information by persons or
entities other than the intended recipient is prohibited.
Messages sent via this medium may be subject to delays, non-delivery and
unauthorized alteration. This email has been prepared using information
believed by the author to be reliable and accurate, but Indium
Corporation makes no warranty as to accuracy or completeness. In
particular, Indium Corporation does not accept responsibility for
changes made to this email after it was sent. Any opinions or
recommendations expressed herein are solely those of the author. They
may be subject to change without notice.***
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text
in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at:
http://listserv.ipc.org/archives
Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
