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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