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This article describes a method in which a controlled amount of chemical is applied on paper, thereby eliminating the problems associated with variable printing parameters.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
63% of the total text.
Page 1 of 1
Controlled Wetting Process for Electrochemical Printing
This article describes a method in which a controlled amount of chemical is
applied on paper, thereby eliminating the problems associated with variable
In order to produce reproducible electrochemical printing, it
is essential that a uniform fluid film be generated on the paper.
The amount of fluid to be applied depends on parameters such as:
a) porosity and fiber structure of the paper,
b) hygroscopic behavior, wettability of the paper, and
c) the printing speed which determines the time available for
the fluid being absorbed.
If excess fluid is provided, the reaction product (deposit) will float in the fluid
film, resulting in wiggly characters. Excessive soaking of paper may also result in
buckling of the sheets or may require an extra drying process.
If insufficient fluid is provided, excessive voltage requirements result for
constant optical density printing.
A method is described to maintain the proper fluid supply over a big practical
range of paper quality and print speed.
While printing is in progress, the fluid is supplied by devices such as capillary
tubes, air brushes or nebulizers. The amount of fluid supplied together with the
important parameters described above result in a certain current which in turn is
responsible for the print density. It is known how much current is required per
print element to ensure the desired print quality. Therefore, it is possible to