Method and apparatus for dispensing fluid having volatile solvent
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United States of America Patent
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Mar 2, 1999
Grant Date -
N/A
app pub date -
Feb 7, 1997
filing date -
Feb 7, 1997
priority date (Note) -
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Abstract
A method and apparatus for preventing nozzle clogging in systems for dispensing fluids that comprise a suspension or solution of solid particles in a volatile solvent, such as ink jet printing systems consisting of a control valve and a nozzle, the method comprising causing the solvent to withdraw from the nozzle by increasing diffusion of the solvent from the system at a point distal from the nozzle by means of inserting, between the nozzle and the control valve, a section of tubing that is semipermeable to the solvent, and the apparatus comprising the usual dispensing system with the addition of a semi-permeable tube between the control valve and the nozzle.
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