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Electrochromic printing is carried out by applying a sensitizing dye containing solution to the paper surface followed by voltage pulses with writing electrodes.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
69% of the total text.
Page 1 of 1
Elimination Of Electrode Generated Drag During Electrochromic Printing
By Electrostatic Repulsion Of Dyes
Electrochromic printing is carried out by applying a sensitizing dye containing
solution to the paper surface followed by voltage pulses with writing electrodes.
It has been noticed, especially when applying the solutions just prior to
printing, that the dye molecules do not penetrate fast enough inside the paper
structure; they seem to adhere to the moving electrodes and, as a consequence,
the printed dots show smear or dragging.
As the dye molecules are in general charged entities (dye-ions), it is
proposed that their separation from the electrodes and the penetration depth in
the paper may be controlled by electrostatic fields. For example, to prevent the
dye molecules from staying close to the writing electrodes, an electrical potential
can be applied of opposite polarity to the dye charge so as to repulse the latter
towards the paper bulk. This can be done by means of a negative polarity applied
to the writing electrodes immediately after completion of the positive writing pulse
which caused the permanent coloration of the dyes.
The geometry of the electrodes can remain the same as in the present
arrangement, but the reference electrode should be made of a material which
does not discolor the dye if it is at positive polarity with relation to the writing
The reference electrode should be made of materials such as W, Al, Si which
do not produce...