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Electrochromic Printing on Regular Paper Disclosure Number: IPCOM000050937D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 3 page(s) / 29K

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McGroddy, JC: AUTHOR [+4]


Electrochromic printing on regular paper is accomplished by applying a mist to the paper at the print station.

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Electrochromic Printing on Regular Paper

Electrochromic printing on regular paper is accomplished by applying a mist to the paper at the print station.

The art of nonimpact printing has been covered by various technologies competing for preeminence, such as: - thermal printing -- a color- change in heatsensitive paper is

produced by the action of an electrically heated printhead.

- electroerosion printing -- a metal layer on special paper is

made to evaporate, exposing a dark background by the action

of a thermal printhead or styli,

- electrosensitive printing -- an organic resin layer is burned

off, exposing a black background underneath.

- electrochemical printing -- paper is made conductive by an

electrolyte, and a sharp color change occurs by passing a

current between a printing electrode and a reference


All of these methods suffer from one disadvantage: the need for special paper.

Electrochemical printing, one of the oldest techniques for printing, is based upon electrochemical reactions. The substrate (paper) is made conductive by the application of an electrolyte solution. Many electro-chemical systems have been proposed, but all of them, up to the present, use special paper which was specially treated in advance.

Regular paper may be used by activating the paper "on the spot" at the moment of printing. This is done by applying the electrochromic reagent, usually waterbased, by means of a mist or aerosol, as shown in the figure.

The printer 10 includes mist generator 11 which contains a desired print solution 13. The mist 14 is ejected from a nozzle C. The mist moves across a sheet of paper 15, closely followed during its excursions by an electrode printhead 12.


There are various ways to carry out the mist-electrochromi...