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September 1999

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From:
"Ingemar Hernefjord (EMW)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 8 Sep 1999 15:41:39 +0200
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Dear Mr Aussilek c/o Coopers Crossing

1. You don't understand. When I say between 1,600 eyes I mean 1,600 eyes. Reason: when they at TechNet see that it's me again they look suspiciously with one eye. 1,600x1=1,600.

2. Need your advice (and the other 3-4 dispenser interested guys)quickly. I have cut some syringes and sliced them and opened them for having a look on inside, and I marvelled. Imagine californian redwoods bent inwards out, that what I see. Can I send you a photo, Aussilek, for professional opinion (despite all joking). I'm not intending to spread these results to others than those who have supported me, wouldn't be fair at the moment, maybe a report later when problems are solved. Can you give your opinion asap, we will possibly go to Boston for discussions with a supplier.

3.Your proposal how to test syringes wasn't so succesful. Ended in 20 liters of honey on the floor, my wife didn't like it, millions of wasps waiting on outside. Do you have a simpler way, Aussilek?

4. Green eyes, no problem, glad you didn't say (hrm)the brown one.

Ingemar


-----Original Message-----
From: Paul Klasek [mailto:[log in to unmask]]
Sent: den 7 september 1999 04:34
To: [log in to unmask]
Subject: Re: [TN] Clogging dispensers soon...


Hi Pumpkin
Severe question indeed (what's this da business, I thought Stockholm not
being in Finland would escape the Russian influences? ) . Lets go through
Pumpkin's module of Steve's maths :
I)
1600(+)members = 1600(+)buds with 2eyes each = 3200(+)eyes cyber conference
.
Pictured the parallel lines (one cross-eyed pair in infinity), correct,
looks like HK airport in typhoon process .
a)
hindrance, correct, but NOT in outlet of needle (drips, remember?); the
inlet more likely :
flakes being clumsy solids in fluids will be manipulated by inconsiderate
internals (angles, reductions, etc);
on top of standard wall drag .
overpressure, correct again with the low viscosity (considering your minimal
pressure reported).
I always stated piston (linear) would beat auger in this application.
One of other dispensers (air all the way) for silicones we have here takes
off the pressure (sudden = gulp back)on the end of cycle ; whereas the gulp
back sucks back the running inertia ; than keeps level with 0psi .
Even the position and stage of emptiness of cartridge (vertical, horizontal,
below or above dispensing point, full or quarter full only, etc.) was rather
critical in the long (repeatability) run on this low viscosity's (drips).
Unless designed that way (642 auger is not); without positive shut of
valve(paste) or at least air release (non complicated in low psi's ; as it
can not gulp the cartridge piston back) ; you have very little chance of
repeatability condition.
Sound some poor soul over there did not validate the application and still
tries to put square peg to round hole .
Hope it's not you . The auger will spiral the CONSTANT pressure if you stop
on low viscosity > drips .
b
no it won't be a problem as such (with consistent suspended particles), the
mass and it's composition stays more or less same ; however the smeared
agglomerations from auger will plug you up (right there).
c
hmm ; bad idea pumpkin :
c1
precision cut needed ; take burr of inside ; put chamfer back on the outside
(essential for release),
ok you can do it ; I know ; still:
c2
you alter (if not remove) the streamlining factor for the flow ;
and get the "impression" of auger onto the dot;
seen even a crawl-up back on outside of the needle with very short orifices
(pending viscosity)!
c3
2mm or 10mm ; the blockage would occur on inlet ; not down the pipe .
From flakes view ; once (if) in, that length would have actually more
streamlining effect :
paralleling the flakes due to side drag = no issue there .
c4
the cutest one on the end : what do you 'think' prevents you from worst
still dripping presently ?
Drag on the needle walls ! The length is actually very much stabilizing
factor :
Empirical test : head to your kitchen ; take 2 funnels ' chop one short ;
stand 'm on bottles ;
2 honey jars in two (2)hands ; even pour , and watch thereafter .
if you mix few comparatively sifted flakes in (no bubbles please) ;
it will open your (2) eyes (green?)in no time .

see yo'
                                          paul

PS
Cleaning ; pressurized water (grease pump should do you): put needle back on
cartridge; plug side tube;
connect water ; and press the hydraulics button .
Laser cuts into metal, and how would you feel to be sandblasted ?!?
Perhaps a considerate winding (yes, you've guessed it, your sewing machine
spool winder) cotton thread inside polish would do ?

PPS
Sorry, it's niet, pumpkin ; wrong theory ; rapid efforts in this direction
are getting you fast nowhere .

Now ; lets see if your alleged Cyclops come home with bacon .
I'd consider an apology to the bright stereoscopic (at least, discounting
Shiva disciples) lodge here, pumpkin .




-----Original Message-----
From: Ingemar Hernefjord (EMW)
[mailto:[log in to unmask]]
Sent: Monday, 6 September 1999 20:57
To: [log in to unmask]
Subject: [TN] Clogging dispensers soon...


Rescuers of going-crazy-dispenser-technicians, Morning to you all,
I must have a talk with you between 1,600 eyes.  Take a chalk go to an
airport and paint two paralell lines, 1000 meters long and 150 meters apart.
Then make obstacles here and there that makes the path only 100 meter wide
or even 75 meters. This is your runway for taking down a Galaxy. Could go,
but what if you have some Cessnas att the same time? That's what the silver
flakes have too pass in a 10mm long syringe, with a nominal diameter on
150um, a minus tolerance upon that plus other obstacles on the walls. Now,

a ) suggest that you get some flow hindrance near the syringe's outlet,
caused by large flakes agglomeration, what will happen the nearest tenths of
seconds after the auger stopped dispensing? Won't there be a small
overpressure on inside of the syringe? And won't that small overpressure
decrease simultaneously with the small amount of paste that passes the
obstacles and comes out of the syringe? Can this be a reasonable theory why
we see small amounts of paste dripping out from the syringe when the robotic
make a secon or two pause?

b) won't it be a problem for all flakes to pass all these 10 mms long
syringe in a 80-150um channel, especially if many flakes differ from the
paste's medium size, I mean 30-50um  instead om 5um? And won't it be even
worse if  som flakes agglomerated already in the pump before coming to the
syringe?

c) coming finally to my proposal. If you cut your syringe to, let's say 2mm
length instead of 10mm, won't the whole problem be much smaller? IF there is
still some obstacles, the volume on inside the syringe is much smaller =
less leakage of paste between dots (pauses), because built-up pressure will
go down much quicker.  And the clogging risk ought to be much smaller even
that, won't it because 4/5ths of the tunnel is gone.

Aussilek use to be brightest, but there ought to be more with  (he-he).
Severe question: am I right? Please, say da. If the theory seems OK, we will
make a very rapid effort in order to get the precision line running /

Ingemar Hernefjord
Ericsson Microwave Systems

PS. Following question: with a 2mm long syringe, could laser be way to
remove remaining obstacles so that a 150um-minus75um- syringe becomes a
true 150um syringe? Or jetwater? Or sandblast?

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