Gaby,
Yes, nice reply and good to see from you again. Part of relamination process
management, as you so clearly stated, is oxide management as well as
cleaning and baking processes. Others include prepreg and core material
selections including stuff that's too old, not resin rich enough, or
whatever. Lest's not forget lamination press cycles as thermal and
mechanical.
As an example of thermal, the press cycle may be shy on temp over time,
heater element (s) not functioning, not the right thermal lag or lag
material, etc.. For mechanical, it might be press platten non-parallelism,
to much or little pressure over time, and just plain poor overall process
management.
And on it goes,
Earl Moon
----- Original Message -----
From: Gabriela Bogdan <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, August 28, 1999 2:36 PM
Subject: Re: [TN] Blisters or Delamination after Wave...
> Hi!
> This reminds me of the same problem with a batch containing different date
codes and
> another one from different vendors . I suppose that this batch was too
small to be from
> two different dates or vendors, but sometimes if there are a few boards
missing to
> complete an order, it may happen.
> One of our vendors had this problem when he changed his copper oxyde
process. Another
> one had left the batch overnight in the copper oxyde tank.
> These were the answers to our complaints.
> Gaby
>
> Charles Barker wrote:
>
> > How old are the boards, Steve? FR-4 or Polyimide?
> >
> > I've seen old boards do that. Suspected moisture entrapment. Never have
seen it
> > with "new" boards.
> >
> > Charlie B.
> >
> > Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please
respond to
> > [log in to unmask]
> >
> > To: [log in to unmask]
> >
> > cc: (bcc: Charles Barker/US/I-O INC)
> >
> > Subject: [TN] Blisters or Delamination after Wave...
> >
> > Hi ya'll!
> >
> > Well, I'm in onna Saturday...(Months end, you know how that goes!). Just
> > finished waving a small lot of boards (9 assemblies) and 5 of them came
off
> > the wave with these dime to quarter-sized delaminated blisters, maybe
3-4 of
> > them on each board, and the other 4 boards looked fine! What would cause
> > that? Entrapped moisture? The boards were supposedly baked before wave
(At
> > least the traveler said they were). Any ideas?
> >
> > -Steve Gregory-
> >
> > ##############################################################
> > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
> > ##############################################################
> > To subscribe/unsubscribe, send a message to [log in to unmask] with
following text in
> > the body:
> > To subscribe: SUBSCRIBE TECHNET <your full name>
> > To unsubscribe: SIGNOFF TECHNET
> > ##############################################################
> > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
additional
> > information.
> > If you need assistance - contact Gayatri Sardeshpande at [log in to unmask]
or
> > 847-509-9700 ext.5365
> > ##############################################################
>
> ##############################################################
> TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
> ##############################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
following text in
> the body:
> To subscribe: SUBSCRIBE TECHNET <your full name>
> To unsubscribe: SIGNOFF TECHNET
> ##############################################################
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
additional
> information.
> If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
> 847-509-9700 ext.5365
> ##############################################################
##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe: SUBSCRIBE TECHNET <your full name>
To unsubscribe: SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################
|
