Droplet depositing viscosity line-pressure sensing control for fluid re-supply
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United States of America Patent
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Mar 11, 1986
Grant Date -
N/A
app pub date -
Apr 19, 1984
filing date -
Apr 20, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fluid including a liquid solvent or carrier medium is applied to a substrate using an ink jet printing device in which the fluid composition is ejected through a nozzle as a jet of fluid, the jet is broken up into substantially uniformly sized droplets by the application of vibration to the composition, the droplets are passed by an electrode by which they are given an electrical charge, the charged droplets are passed through an electric field whereby they are deflected to a desired extent so as selectively to fall upon a substrate to form a symbol thereon or into a catch from which the composition is recycled for re-use. The viscosity of the fluid composition is monitored, and solvent or carrier liquid is added to the fluid to return the liquid content of the fluid to a desired value.
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