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Browse Prior Art Database

Printing by Producing Electroactive Wettable Surfaces

IP.com Disclosure Number: IPCOM000078661D
Original Publication Date: 1973-Feb-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Damm, EP: AUTHOR

Abstract

The present method is capable of printing speeds approaching those of high-speed newspaper presses. The basic concept involves selective wetting of a printing surface to produce an ink image, which can then be transferred to ordinary paper.

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Printing by Producing Electroactive Wettable Surfaces

The present method is capable of printing speeds approaching those of high- speed newspaper presses. The basic concept involves selective wetting of a printing surface to produce an ink image, which can then be transferred to ordinary paper.

The essential features of the process are shown in the figure in a highly schematic form. Roller 1 is preferably constructed of an elastomeric material of proper resistivity, to retain an electrostatic charge for at least one revolution. Carbon filling of rubber is a permissible way to attain desired resistivity. Additionally, the roller should be lyophobic to the particular ink selected. As an example, semiconductive rubbers conventionally used in electrostatic clutches are satisfactory for water based and certain oil based inks. Station 2 is a write head or matrix which imparts an electrostatic image to the roller. Roller 3 is a simple inking roller which contacts the elastomeric roller or blanket uniformly over its surface. It will be noted that the ink will selectively transfer to the elastomeric roller only in areas where an electrostatic charge is present.

Rotation of the roller 1 beyond the inking station brings it into contact with the record document 4 which would conventionally be paper. Roller 5 is a conductive roller which is continuously or intermittently, if more than one copy of a particular image is desired, brought into contact with the elastomeric roller....