Hewlett-packard Development Company, L.P.

Hp Indigo B.v.

Hewlett-packard Indigo B.v.

Daniel Tanchangco

Guang Jin Li

Bin Huang

Kai-Kong Iu

Anna Chin

Omer Gila

Thomas C Anthony

Alexey S Kabalnov

Seongsik Chang

David Sabo

Stephen G Rudisill

Stanley J Kozmiski

Eyal Negreanu

Minedys Macias Guzman

Jeffrey Zampell

Jingzhi Lu

Paul McCaslin

A developer roller having a first section that includes a first exterior surface, wherein the first exterior surface includes an electrically-conductive material; and a second section includes a second exterior surface, wherein the second exterior surface is non-electrically-conductive. The second section is axially aligned with the first section and provided at a first longitudinal end of the first section.

Developer roller

Herein is described a liquid electrophotographic a printing apparatus comprising: a photoconductor; a liquid electrophotographic ink developer unit for applying liquid electrophotographic ink to the photoconductor; a cleaner roller contactable with the photoconductor, the cleaner roller comprising an open-celled foam material having thereon a coating comprising abrasive particles and a binder. Also described herein is a cleaner roller for cleaning a liquid electrophotographic printing apparatus' photoconductor and a method of operating a liquid electrophotographic printing apparatus using a cleaner roller described herein.

Cleaner rollers and cleaning electrophotographic photoconductors

A nanoparticle used in 3D printing is disclosed herein. In an example, the nanoparticle can comprise: at least one metal oxide, which absorbs infrared light in a range of from about 780 nm to about 2300 nm and is shown in formula (1):MM'O&#x2003;&#x2003;(1)wherein M is an alkali metal, m is greater than 0 and less than 1, M&#x2032; is any metal, and n is greater than 0 and less than or equal to 4; and a bilayer-forming surfactant encapsulating at least a portion of the metal oxide, wherein the nanoparticle has a diameter of from about 0.1 nm to about 500 nm.

Infrared absorbing nanoparticle(s)

Described herein is a liquid electrostatic ink developer assembly comprising a developer roller having a surface coating, the surface coating comprising a polyurethane resin formed from a polyol; a hydroxyl-terminated polysiloxane; and a polyisocyanate. Also, described herein is a liquid electrostatic printing apparatus comprising the liquid electrostatic ink developer assembly.

Liquid electrostatic ink developer assembly

The present disclosure relates to a liquid electrophotographic ink developer unit. The unit comprises a developer roller comprising a layer formed from a polymer composition containing a conductive filler, whereby the polymer composition has a specific resistivity of less than 1&#xd7;10&#x3a9;&#xb7;cm. The unit also comprises a secondary roller that co-operates with the developer roller.

Liquid electrophotographic ink developer unit

In one example in accordance with the present disclosure, a fluid application device is described. The device includes an application roller to deposit a fluid containing metallic particles on a surface. A squeegee roller of the device forms a first nip with the roller and a cleaner roller forms a second nip with the application roller. A first resistive coating is disposed on a surface of the application roller.

Fluid application devices with resistive coatings

The present disclosure relates to a liquid electrophotographic ink developer unit. The unit comprises a developer roller, and a secondary roller that co-operates with the developer roller. The developer roller is formed of a material having a specific resistivity of less than 1&#xd7;10&#x3a9;&#xb7;cm. The secondary roller is formed of a material having a specific resistivity of 1&#xd7;10to 1&#xd7;10&#x3a9;&#xb7;cm.

A method of preparing the surface of a roller comprising adding a coating comprising isocyanate to a ground surface of the roller. A roller comprising a ground surface, the ground surface having unreacted hydroxyl (&#x2014;OH) groups on the surface of the roller and a layer of isocyanate layered over the unreacted hydroxyl (&#x2014;OH) groups on the surface of the roller, the isocyanate forming a urethane bond on the surface of the roller.

Growing community of inventors

San Marcos, CA, United States of America

Daniel Tanchangco