Nordson Asymtek
Mini and micro dispensing solutions for fluids and pastes
page 8 off 20
3.5.1 Dosing and transferring: please do not succeed 6 bar pressure on the pump suction
side. Keep the pressure constant to avoid bad dosing results. In case needed, use a
pressure reduction valve. Avoid backpressure of >10 bar (145 psi) on the pressure side.
These are theoretical values made with water at 22°C (71.6 °F). Higher pressures can be
reached according the material viscosity and pump speed. Please adapt the nozzle and
needle in length and diameter to decrease backpressure. By using conically shaped needles,
the backpressure can be decreased so the suckback optimised.
Notice: We suggest using tapered needles whenever possible
3.5.2 Emptying: Stainless steel bodied pumps can be used up to 15 bar (217 psi). Plastic
versions should not be used above 7 bar (100 psi). In both cases, you will be able to reduce
the seal wear.
3.6 Commissioning
Open the leakage control which you can find opposite of the material entrance which
is sealed with an o-ring. Gently pre-fill the pump when possible, by using low pressure
steps. Give the product enough time to flow! As soon as material comes out of the
bore, you may close the leakage bore. See 4.1 under K
Start the pump with low speed (=filling program) until the material comes out thru the
nozzle without air bubbles. It is wise to put the needle after the bleeding process. You
may put the nozzle up to bleed the air.
Now start the calibration process if available. You will need at least a 3 digit scale.
After the calibration, you can set the dosing volume or speed and start the operation.
Notice: A restart after changing the software parameters could become possible.
3.7 Pump speed table
Following values are only an orientation support and not scientifically proved:
Honey like pastes Max. 80% 1-3 bar (14.5 - 43.5 psi), Max. 3 bar (43.5 psi)
Silicone und Epoxies not filled Max. 80% 3-4 bar (43.5 - 58 psi), Max. 6 bar (87 psi)
UV-adhesives Max. 90% 1-2 bar (14.5 - 29 psi), Max. 3 bar (43.5 psi)
Pastes over 50.000 mPa.s Max. 20% Max. 6 bar (87 psi)
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