Printing system with printing form having a ferro-electric layer

Details Printing system with printing form having a ferro-electric layer Printing system with printing form having a ferro-electric layer

1990-10-29

1993-03-09

Burr, Edgar S.

Printing

Planographic

101467, 101478, B41N 110

Patent

active

051918340

ABSTRACT:
To provide an electrically controllable printing form, on which the printing image is retained even upon repeated application of printing toner or printing ink formed of toner suspended in a carrier liquid, the printing form (10) has a surface layer (12) of ferroelectric material or, if a gravure form (40), the cells (31) have a bottom (32) of ferroelectric material. The form is programmed under control of a control unit (13, 13') by an electrode (14, 14') which selectively polarizes the ferroelectric material. Upon application of electrically charged toner or ink, the ink or toner particles which are charged oppositely to the polarization of the ferroelectric layer or bottom will be retained, the equally charged particles repelled, so that, by selective positive or negative polarization, two-color printing can be effected at one pass of a printing substrate over the form.

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