Thanks Inge for being so intuitive ; always contemplated the unfairness of
uncuddled elephants .
Agree with scales, economies and validations (near end just because
specialists are landing ?: ever optimist):
with that (2um) scale of particles the fill and rheology will(one day) alter
to a completely new field .
One thing which may sway somebody like able's lab would be the on-surface
resistivities which you mentioned earlier;
those would improve rather dramatically . Being one of major factors, that
should give them very much of a market edge.
Good to see into silver soul transmutations (SEM does aid one's vision);
you view from the correct perspective (pump is secondary).
Balls would be nice, but viewing the temps, oxides(inert)and other demands
on such a process we may be stuck with flakes for a long time .

see you                  paul

PS
Humidifiers still fashionable in steamed Swedish interiors (not talking
saunas here?),
day AND night ?
Sounds exiting (for non steel fine mechanics) ; what about ionizers ?
I may be in the illusion they're coming into fashion elsewhere .

PPS
Progressed on the Blad's digiplates ; found 'em on Blad US site .
Just the price!(us$30K!) ; almost considering making them myself .

PPPS
Did you check the linear pumps ?


-----Original Message-----
From: Ingemar Hernefjord (EMW)
[mailto:[log in to unmask]]
Sent: Friday, 3 September 1999 23:24
To: [log in to unmask]
Subject: [TN] Clogging dispenser (cont'd)


Dear netters on the cheering section( special attn to Aussilek, who is a
very sensitive person),
the clogging mystery is not ended yet, but the end is near: Camalot's own
specialists are soon landing in our line. During waiting we tried the idea
to make a mathematical model of the system: paste cartridge, inlet, auger,
pumphouse, syringe and paste. The modeller has a lot of NASTRAN/ANSYS stuff
as tools, which we thought would make the whole thing a one week job, but
forget that! There are so many unknown material parameters and such complex
a matrix, that it would take one year to gather all inputs before
calculation could begin, said our physicist. He recommended a way to find
solutions based upon good empirical tests instead.

We have found that the paste has from 0.1um  to 25um large flakes, and
according to the theories, the flakes stop sliding over each other at
approximately 2um. Much over 2um the flakes will instead starting
agglomerations, therefore some say, that a modern silver epoxy for high
speed, 150um dot precision dispensing, should have a distribution of
something like 0.2um to 2um. The paste manufacturer may not be to excited to
assist in finding the best solution, not if you calculate how much paste
will be sold when the dots are in the size  of what the fly left on your
plate.

I have made an investigation of the pump and the auger, and I found a lot of
interesting things that will certainly help. I doubt that even Camalot
themselves have done a SEM examination on inside of the pump, we have! Now I
understand better, what it is like to be a silver paste in a pump.....
To be cont'd and finished very soon
CU
Ingemar Hernefjord
Ericsson Microwave Systems

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