Dispensing – Processes of dispensing
Patent
1996-05-28
1998-02-03
Kaufman, Joseph
Dispensing
Processes of dispensing
222 14, 222 61, 222 77, G01F 1100
Patent
active
057134863
ABSTRACT:
A desired amount of liquid ("unit dose") to be dispensed from a stationary dispenser is automatically, accurately controlled by suddenly interrupting the flow of liquid being dispensed after a major portion of the unit dose has been dispensed. A portion of the lost momentum is restored and discharge of the unit dose is completed. Pressurized inert gas is used to speed up dispensing the unit dose to meet a fill-and-discharge cycle time of <2 min, preferably <1 min. The unit dose is dispensed with better than .+-.5% accuracy, preferably at least .+-.3%, without measuring either the level or the volume of the liquid in the dispenser, or directly measuring the weight of liquid dispensed. More than the desired amount of liquid to be dispensed is held in the dispenser which is charged under pressure in the range from 380-790 kPa (40 to 100 psig), at too high a velocity to establish a stable level. The velocity of the liquid through quick-opening and quick-closing inlet and outlet valves introduces a variable which is more disruptive of accuracy than any random variation of its specific gravity, or the pressure within the dispenser. The liquid is therefore indirectly weighed, both into, and out of the dispenser by sensing the force exerted on a load cell by an elongated body having a constant cross-sectional area immersed in the liquid. A preset force corresponding to a desired loss of weight, provides an analog output signal to a controller which generates an output signal to interrupt the flow of liquid from the dispenser. The flow is re-stored within less than 1 sec, preferably less than 0.5 sec, and the discharge of the desired amount of liquid is completed under pressure.
REFERENCES:
patent: 4013194 (1977-03-01), Moscarini et al.
patent: 4244218 (1981-01-01), Wohrl
patent: 4320775 (1982-03-01), Stirling et al.
patent: 4804111 (1989-02-01), Ricciardi et al.
patent: 5197633 (1993-03-01), Hines et al.
patent: 5568882 (1996-10-01), Takacs
Kaufman Joseph
MBT Holding AG
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