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DEGASSING TECHNIQUE

IP.com Disclosure Number: IPCOM000027008D
Original Publication Date: 1994-Dec-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 74K

Publishing Venue

Xerox Disclosure Journal

Abstract

After continued use of a thermal ink jet (TIJ) print head, air comes out of the ink solution and the bubbles that form limit the ink flow through the print die. Eventually the bubbles block the ink flow and the ink drops no longer jet, causing copy quality problems.

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XEROX DISCLOSURE JOURNAL

DEGASSING TECHNIQUE Proposed Thomas N. Taylor Classification

U.S. C1.346/140R Int. C1. GOlD 15/18

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 6 NovembedDecember 1994 453

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

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DEGASSING TECHNIQUE(Cont'd)

After continued use of a thermal ink jet (TIJ) print head, air comes out of the ink solution and the bubbles that form limit the ink flow through the print die. Eventually the bubbles block the ink flow and the ink drops no longer jet, causing copy quality problems.

A method for preventing air bubbles from blocking ink flow is not to degass the ink but instead to allow the bubbles to form in the print die over a period of time and then to perform an ink flushing operation. Ink 1, contained in an ink supply 2, is delivered through an ink supply line 3 to a printhead die 4 during printing. A valve 5 connects the ink supply 2 and a source of forced air, such as an air pump 6, to the printhead die 4. Flushing of ink begins with removing the ink from the printhead die, such as through the application of a vacuum to the front of the printhead die, and then forcing compressed air from the pump 6 through the die 4. The surface tension which holds the bubbles in place is broken when the ink is removed. The entrapped air is also removed by the flushing operation. When the die is refilled with ink, the die starts over in a "new" condition and the process begins again. Since it is likely that...