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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