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Ink Balance Control for an Ink Jet Printer

IP.com Disclosure Number: IPCOM000036256D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Pimbley, WT: AUTHOR [+2]

Abstract

Disclosed is a method for controlling the physical properties of the ink in a pressure ink jet printer. This method controls the metering of a make-up fluid into the ink reservoir system of an ink jet printer so as to maintain the volume fraction of nonvolatiles in the ink.

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Ink Balance Control for an Ink Jet Printer

Disclosed is a method for controlling the physical properties of the ink in a pressure ink jet printer. This method controls the metering of a make-up fluid into the ink reservoir system of an ink jet printer so as to maintain the volume fraction of nonvolatiles in the ink.

In a typical pressure ink jet printer system, ink is continuously recirculated through a reservoir and plumbing system during the printer power-on time. During this time, the ink volume is depleted due to both the ink being used for printing and evaporation of the volatile components of the ink. This evaporation causes the remaining ink to become more concentrated, and the ink's viscosity to increase. If left uncontrolled, the physical characteristics of the ink will change out of the range in which appropriate printing is possible.

It is common in a pressure ink jet printing system [*], to provide for the addition of a make-up fluid that is a dilute ink or, even better, a fluid containing only the volatile constituents of the ink. Disclosed herein is a method of determining the proper metering rate of the make-up fluid into the ink reservoir system in order to maintain the ink's balance between volatile and nonvolatile constituents.

The proper metering rate of a "volatiles only" make-up fluid into the reservoir system is that that will just compensate for the evaporation loss rate. If the ink were circulating with no printing, this would entail just keeping the ink level constant in the reserv...