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Browse Prior Art Database

Background Reduction in Electrostatic Printing

IP.com Disclosure Number: IPCOM000098628D
Original Publication Date: 1959-Aug-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Bunzey, CR: AUTHOR

Abstract

Print copy having reduced background in electrostatic printing is obtainable by a transfer to a transfer medium which captures background particles and prevents their subsequent transfer to a print copy medium. In the upper drawing an electrographic print element, such as a zerographic drum 10 having a visible image 12 developed thereon by deposition of electroscopic toner particles, is brought into contact with a web 13 of very thin open-mesh material, such as Fischer lens tissue, at a first transfer station including a transfer roller 14 or the like. Background particles 15, as well as the bulk of the image particles,

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Background Reduction in Electrostatic Printing

Print copy having reduced background in electrostatic printing is obtainable by a transfer to a transfer medium which captures background particles and prevents their subsequent transfer to a print copy medium. In the upper drawing an electrographic print element, such as a zerographic drum 10 having a visible image 12 developed thereon by deposition of electroscopic toner particles, is brought into contact with a web 13 of very thin open-mesh material, such as Fischer lens tissue, at a first transfer station including a transfer roller 14 or the like. Background particles 15, as well as the bulk of the image particles,

become transferred onto the web. Substantially all of the background particles become entrapped in the fibers of the material upon transfer. While some of the particles forming the image are also entrapped, the bulk of these latter particles is removable to a print medium 16, brought into contact with the image-bearing surface of the web at a second transfer station comprising a pair of transfer rollers 17 and 18.

The lower drawing illustrates an alternate form of apparatus having a single transfer station. Open-mesh web 13 and print medium 16 are fed from separate supply reels 20 and 21 and brought into superimposed contact with the surface of the image-bearing drum 10 at a transfer station having a transfer device which might include a transfer roller 19. Upon contact, the transfer of the developed ...