Method and apparatus for precision pumping, ratioing, and dispensing of

Abstract

For conveying and for dispensing of degassed work liquid(s), an apparatus and a method for precision conveying and/or ratioing and/or mixing and/or dispensing of work liquids are presented using a pump of a positive displacement, high precision, piston/cylinder constant flush type with piston smaller than the chamber. The piston is programmably advanced along a stroke with tiny repeatable adjustable steps. Infinitely adjustable precision ratioing and/or programmable mixing of degassed materials may be provided downstream of the pump outlets when degassed liquids are presented to the inlets of two such pumps. The mixing occurs in a mixing chamber, the output of which is then used. The vacuum degassed work liquids may be dispensed in a system which features the creation and maintenance of a positive absolute pressure on the work liquids throughout, from the point of exiting a first degassing chamber to an end use at a dispensing outlet. This occurs whether the degassed liquid is moved along the flow path through the precision dispensing pumps or other types of pumps and prevents unwanted entrainment of gases. Available software and adjustable programmable precision hardware are used in the system, and features use of widely available personal computers. Precision relative location and/or movement of workpieces and dispensing outlet(s) are provided. Further degassing of the work liquid(s) may be provided by dispensing in a vacuum chamber.