Hi Honeywell,
of course this is up also for discussion, however, does not seem to be
curing. We begin to come closer to the mystery's solution. By increasing
the auger's thread depth from ultrashallow to just shallow (85um to
160um), we get less clogging, but clogging occurs with longer intervals.
We also mean that the space between the steel auger and the carbide
pumphouse must be of much interest, so today we will precision measure
these dimensions. We are assembling all mystery factors in order to get
a reliable process window. Aussie's tips about cold fusing flakes seem
to be most reasonable, but to prove is the disaster. We are 12 persons
working with the problem now. The boss said you have some days more, if
not solved, you will..you will.. you will see.
Best regards
Ingemar Hernefjord
Ericsson Microwave Systems
> We have used silver conductive epoxies (pre-mixed) dispensed manually
for
> interfacial bonding. There was no clogging issue. Something not yet
> revealed by you, what is the vendor stated cure time and temperature
for
> this material? Is it just clogging or could it be curing?
>
> R. Blomberg
> Staff Production Engineer
>
> -----Original Message-----
> From: Paul Klasek [mailto:[log in to unmask]]
> Sent: Monday, August 16, 1999 6:41 PM
> To: [log in to unmask]
> Subject: Re: [TN] clogging dispensers
>
>
> Well ' we're getting there :
> 1
> Yes ; the round balls 8x smaller go better through needle than 2x only
> smaller flakes
> But that obviously does not matter , as well as the tip temperatures
as you
> just removed it and it's still clogging !
>
> Inge , perhaps last desperate idea :
>
> You said the flakes are 1-50um .
> reading the tolerances would give logical conclusion the flakes can
build up
> between the wall and outer auger surface.
> Can you describe the clog : deposition on ceramic wall, inside the
auger
> groove , or a plug on exit ?
> Sounds (wild idea) like the flakes could be smudged on wall ;
compressed to
> super flakes and jam eventually .
> Is there a grade like 25-50um (bit wishful, I know)?
>
> Shaafi worked with 642 for a decade+ ; see if he can help .
>
> Shaafi, could you please help us to resolve this mystery ?
> Subject is silver loaded epoxy clogging WITHOUT NEEDLE .
> Seen anything like this ?
>
> Inge's climbing walls and us the netters don't like to give up .
>
> Thanks a lot ahead buddy .
> If you'd be stuck too ; could you point us to somebody more
experienced
> still ?
> I'd love to know myself ; this next lead-free millenium ain't going to
be
> fun .
> What do you think about the 2psi ?
>
> paul
>
>
>
> -----Original Message-----
> From: [log in to unmask]
> [mailto:[log in to unmask]]
> Sent: Monday, 16 August 1999 20:01
> To: [log in to unmask]
> Subject: Re: [TN] clogging dispensers
>
>
> To you all that help me with finding reasons for clogging: pump is
> Camelot 642-1, carbide housing and auger with following data
> - thread depth is 85microns
> - thread pitch is 1,500 microns
> - thread peripherical is polished to Ra 40nm /TIR 300 nm
> - thread shallow part is polished to Ra 1.5um/TIR 7um
> - pressure at syringe level is 2 psi.
>
> Needle removed: still clogging in the pump! Ain't she sweet! Don't
know
> if Tim wanted to be on his own. Some people do not want to cry out
> details worldwide.
>
> /Ingemar
>
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