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Ink Dilution Control by Osmosis

IP.com Disclosure Number: IPCOM000081996D
Original Publication Date: 1974-Sep-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 20K

Publishing Venue

IBM

Related People

Cralle, WO: AUTHOR

Abstract

A method is proposed for adding water to replace water lost from the ink in an ink jet printer or copier. It is based on osmosis, which involves the passage of a solvent through a membrane from a dilute solution to a more concentrated one.

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Ink Dilution Control by Osmosis

A method is proposed for adding water to replace water lost from the ink in an ink jet printer or copier. It is based on osmosis, which involves the passage of a solvent through a membrane from a dilute solution to a more concentrated one.

In an ink jet printer or copier, part of the ink in the nozzle is directed to a character area and the remainder is directed to a "gutter" and returns to a sump for reuse. The ink that returns has had some of the water evaporated from it, depending on the humidity. This causes the ink solution to become more concentrated.

In this method, ink reservoir 1 is positioned adjacent to a water reservoir 2. The two chambers are connected by a semipermeable membrane 3. Appropriate controls maintain the ink level constant and the water level constant but lower than the ink level. Water will flow into the ink as a function of the differential in level and the concentration of the ink, thus renewing the water when the ink becomes concentrated by the evaporation of the water. Concentration can be increased or decreased by changing the difference in level.

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