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Tutorial
Time-Pressure Dispensing
Time pressure dispensing is the most common dispensing method used today. Its popularity stems from the need for process control and the fact that it is possible to dispense from disposable containers without the need for cleaning.
Our time-pressure dispensers deliver a measured amount of air pressure, for a measured amount of time, to a pre-filled syringe barrel. This controlled shot of air pressure forces material out of the delivery end of the barrel, through a dispensing tip, and out to the application surface.
Factors Affecting Dispensing
� PRESSURE: Increasing fluid pressure will increase dot size and vice versa
� TIME: Increasing dispense time will increase dot size and vice versa
� NEEDLE SIZE: Larger inside diameter (orifice) needle results in bigger dot size
Basic Dispensing Guidelines:
� SMALL SHOT SIZE = small needle, low fluid pressure, short dispense time
� LARGE SHOT SIZE = larger needle, higher fluid pressure, longer dispense time
� LOW VISCOSITY FLUID = small needle, low pressure, time as required
� HIGH VISCOSITY FLUID = larger needle (tapered needles recommended), high pressure, time as required
� Position dispensing device at 45� angle
� Position the needle close to the work surface then activate the dispense cycle and keep the dispensing device in the same position until the cycle is completed
� If vacuum �suck-back� is needed, use only enough vacuum to draw back fluid into dispense tip. Excessive vacuum could draw air into the fluid and also could draw fluid into the dispenser.
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