Browse Prior Art Database

RESTRICTOR/ORIFICE DE-AERATOR

IP.com Disclosure Number: IPCOM000025382D
Original Publication Date: 1985-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 85K

Publishing Venue

Xerox Disclosure Journal

Abstract

In present ink supply systems for ink jet printers, air content is generally at a high saturation level, sometimes approaching saturation of 7.8 ppm at 21 C. Provisions, of course, must be made to eliminate a percentage of the entrained air in the ink to prevent bubbles from forming in the printer's supply system during operation. Otherwise, variations in running conditions would occur because of the bubbles.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

RESTRICTOR/ORIFICE DE-AERATOR Proposed Classification Peter J. John U.S. Cl. 346/75

Int. C1. Gold 15/18

AERATED INK FROM

RESFRVOIR

VACUUM

f

- -7

19 Volume 10 Number 1 January/February 1985

[This page contains 1 picture or other non-text object]

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RESTRICTOR/ORIFICE DE-AERATOR (Cont'd)

In present ink supply systems for ink jet printers, air content is generally at a high saturation level, sometimes approaching saturation of 7.8 ppm at 21 C. Provisions, of course, must be made to eliminate a percentage of the entrained air in the ink to prevent bubbles from forming in the printer's supply system during operation. Otherwise, variations in running conditions would occur because of the bubbles.

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Referring the figure, a restrictor/orifice de-aerator 10 with an ultrasonic assist is described. Ink 11 is stored at atmospheric pressure in a reservoir (not shown). The ink is pulled from the reservoir through a controlled sized orifice restrictor 14 by a vacuum pump (not shown) drawing ink into the de-aerator tank 12 when solenoid valves 13 and 15 are opened. As the ink is drawn through the restrictor 14, it experiences severe turbulence and a severe pressure drop. These two combined actions cause air that is dissolved in the ink to outgas in the form of air bubbles, coming out of the ink until the air saturation equilibrum for the lower pressure level in the de-aerator 12 is reached. Air content is controlled by applying more or less vacu...