Hewlett-packard Development Company, L.p.

Hp Indigo B.v.

Hewlett-packard Indigo B.v.

Guang Jin Li

Daniel Tanchangco

David Sabo

Stanley J Kozmiski

Eric G Nelson

Kai-Kong Iu

John W Godden

Bin Huang

Anna Chin

Omer Gila

Thomas C Anthony

Alexey S Kabalnov

Seongsik Chang

Yaron Grinwald

Christopher Sean Tanner

Ben Wynne

Matthew Grant Lopez

Brian Eugene Curcio

Reut Avigdor

James Pingel

Ido Finkelman

Eyal Negreanu

Greg S Smith, Jr

David F Chiu

Paul McCaslin

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

In one example, a developer roller for liquid electrophotographic printing includes a cylindrical metal inner core, a rigid conductive plastic outer core surrounding the inner core, and a compliant exterior surrounding the outer core.

Developer roller for liquid electrophotographic printing

A method of balancing current in a developer roller is described. The method includes pulsing voltage to a squeegee roller and a cleaner roller. The pulsed voltage yields a differential voltage at the developer roller after impression. The method also includes pulsing compensating voltage to at least one of the squeegee roller or the cleaner roller to reduce or cancel an accumulated developer current imbalance of the developer roller. The compensating voltage pulses include pulses before or after the impression.

Compensating voltages for electrophotography printing devices

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.

In some examples, a printing liquid developer includes a developer roller that has a hollow tubular base body formed of a material including conductive carbon fiber, a conductive, compliant layer around an outer surface of the hollow tubular base body, and an electrically conductive support separate from the hollow tubular base body and electrically contacted to a surface of the hollow tubular base body.

Printing liquid developer

Described herein is an electrostatic ink composition comprising a liquid carrier; and chargeable particles comprising a co-polymer of an alkylene monomer and an acrylic acid monomer, and a pearlescent, non-metallic pigment, wherein the chargeable particles are dispersed in the liquid carrier. Also described herein are a method of electrophotographic printing and a print substrate.

Electrostatic ink compositions, methods and print substrates

The present disclosure provides composite support material and associated methods used in the fabrication of three-dimensional objects. In one example, a composite support material for three-dimensional printing can include a soluble filament core that is soluble in a solvent and is encapsulated with an insoluble shell that is insoluble in the solvent. The composite support material is stable in air and, when printed, is dissolvable in the solvent.

Composite support material for three-dimensional printing

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.

Roller coating

In one example, a processor readable medium has instructions thereon that, when executed by a processor, cause a system to detect a change in electrical conduction of a liquid moving at an interface between two surfaces and determine a conductivity of the liquid based on the detected change in conduction.

Determining the conductivity of a liquid

Liquid electro-photographic (LEP) printers having a coating disposed thereon, LEP printers having a compound such as fluorosurfactant in the resin to make one or more parts of the LEP printer, and the like, are disclosed.

Growing community of inventors

San Diego, CA, United States of America

Guang Jin Li