APPARATUSES AND METHODS FOR DISPENSING PREDETERMINED QUANTITIES OF LIQUID ONTO A SUBSTRATE

摘要

Discussed herein are methods and apparatuses for dispensing precise quantities of reagents, wherein air pressure is controlled to pilot a liquid syringe or diaphragm that provides an air to liquid interface. The resultant pressurized liquid is then in series with dispensing element, such as an aerosol dispenser, solenoid valve or piezo dispenser. The pump may be controlled by air pressure to provide an incremental quantity or continuous flow of reagent to the dispenser. The pump and dispenser may be operated in cooperation with one another such that the quantity or flow rate of liquid dispensed by the dispenser can be precisely metered substantially independently of the particular operating parameters of said dispenser to attain a desired flow rate, droplet size or mist quality, droplet frequency or droplet velocity.

主权项

1. An apparatus for dispensing predetermined quantities of liquid onto a substrate, the apparatus comprising:
(a) a dispenser having an inlet and an outlet and being adapted to form droplets of said liquid having a predetermined size or quality which are deposited onto said substrate; and (b) a pressurized vessel hydraulically arranged in series with the inlet of said dispenser for metering predetermined quantities of said liquid to said dispenser.