It is possible. We do it. To add to Joe's very good points, the ability
to clean is also dependent on the geometry of the unit, number of
entrapment sites, etc. The first flux can harden to some extent, but
that depends on the fluxes you use. It can be done, but you have to
carefully select your fluxes, cleaning agents, cleaning equipment,
cleaning parameters, and phase of the moon.
Doug Pauls
"Kane, Joseph E (US SSA)" <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
03/16/2010 09:24 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
"Kane, Joseph E (US SSA)" <[log in to unmask]>
To
[log in to unmask]
cc
Subject
Re: [TN] Eliminating interemediate washes
It may be possible, but I think there are two things to
consider:
1. In the time between soldering and cleaning, does the
older flux harden to the extent that it becomes difficult
to clean?
2. Are the flux types in the sequential steps all
compatible? You don't want to mix water soluble residues
with rosin, for example, because you may end up with a
highly reactive residue that is difficult to remove. Better
to clean off the reactive residues before they become mixed
with something else.
-Joe
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Tuesday, March 16, 2010 10:06 AM
To: [log in to unmask]
Subject: [TN] Eliminating interemediate washes
Dear Technos,
Is it doable to wash a mixed technology board ( SMT + TH) only at the end
of TH?
I mean instead of repeatedly washing (SMT first side-wash, SMT second
side-wash, TH-wash, manual soldering-wash) adopting a one wash strategy
(SMT first side-no wash, SMT second side-no-wash, TH-no wash, manual
soldering-wash). TH might not be done in the same day as SMT, but no later
than next day and boards washed within 3 hours after wave soldering.
Is anybody in the industry doing this?
Pros and cons?
Thanks,
Ioan Tempea, ing.
Ingénieur Principal de Fabrication / Senior Manufacturing Engineer T |
450.967.7100 ext.244 E | [log in to unmask] <mailto:[log in to unmask]> W |
www.digico.cc <http://www.digico.cc/>
N'imprimer que si nécessaire - Print only if you must
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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 has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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 has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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
-----------------------------------------------------
|