Hp Indigo B.v.

Hewlett-packard Indigo B.v.

Hewlett-packard Development Company, L.P.

Shahar Stein

Eyal Peleg

George Trendafilov

Itzik Shaul

Dror Kella

Albert Teishev

Mark Sandler

Yaron Grinwald

Shai Lior

Guy Nesher

Shmuel Borenstain

Asaf Anufa

Zvika Cohen

Tsahi Rosenbaom

Nati Sinuany

Omer Gila

Manoj K Bhattacharyya

Michael H Lee

Ilanit Mor

Elliad Silcoff

Tony Azzam

Itzhak Ashkenazi

Samer Farran

Julia Kornilov

Martin Chauvin

Shiran Zabar

Keren Regev

Yael Kowal

Dafna Or-Chen

Tamir Weinstein

Wael Salalha

George Trenda Filov

Doron Avramov

Eyal Pelag

An example method of performing a null cycle in a liquid electrographic printer is described. The method involves collecting, at a photo imaging plate cleaning station, imaging oil deposited on a photo imaging plate during a print cycle. During a null cycle, the photo imaging plate cleaning station is controlled to apply the collected imaging oil to the photo imaging plate.

Operating a liquid electrophotographic printer

An embossing apparatus includes an embossing die that includes a printed relief pattern made up of multiple layers of a deposited material. A resilient surface presses media against the embossing die such that embossed features corresponding to the embossing die are formed in the media. A method for embossing media includes forming an embossing die by depositing multiple layers of ink on a impression layer to form a relief pattern and pressing media against the embossing die to transfer the relief image to the media.

Embossing with printed relief pattern

There is provided a method and apparatus for preparing a print substrate. A surface resistivity of a print substrate comprising a conductive layer is determined. The determined surface resistivity is compared to a print range having a lower threshold value for the surface resistivity of the print substrate and an upper threshold value for the surface resistivity of the print substrate. If the determined resistivity of the print substrate is outside the print range, a surface modification is selected to adjust the determined surface resistivity of the print substrate to fall within the print range. The selected surface modification is applied to the top layer of the print substrate.

Print substrate surface modification

According to an example, an electrophotographic ink may include an adsorbent, a volatile fragrance, a resin and a carrier liquid.

Electrophotographic ink including a volatile fragrance

This disclosure relates to an electrophotographic composition comprising toner particles dispersed in a liquid carrier. The toner particles comprise porous carrier particles infused with a fragrance.

Electrophotographic composition

An embossing die is created by printing multiple ink layers () in superposition thereby to build up a printed relief pattern () in accordance with received design data specifying a design to be embossed. The design data is modified after receipt to introduce into the printed relief pattern to be built, one or more channels () which extend depth-wise through multiple ink layers of the printed relief pattern () and serve to fully or partially segment the printed relief pattern.

Embossing die creation

There is disclosed a computer program product for carrying out a method of calibrating a thickness of an embossing die, the embossing die being formed from a plurality of ink layers printed by an apparatus. According to the method, an average thickness of an ink layer printed by the apparatus may be calculated, and a target die thickness may be calculated as a function of the average ink layer thickness. A system for implementing a method of calibrating a thickness of an embossing die and a method of measuring a thickness of an embossing die are also disclosed.

Thickness calibration of an embossing die

An embossing apparatus comprises an embossing die comprising a printed relief pattern, and a resilient surface for pressing media against the embossing die to emboss features corresponding to the printed relief pattern on the media, in which the printed relief pattern comprises a number of layers of a deposited material, and in which a number of layers of the deposited material closest to the top of the printed relief pattern comprises a deposited material with a relatively lower coefficient of adhesion than layers of the deposited material disposed under the deposited material closest to the top of the printed relief pattern. A printed relief pattern for embossing media comprises a number of preliminary layers, the preliminary layers comprising a first material, and a number of terminal layers, the terminal layers comprising a second material, in which the second material has a lower adhesive coefficient than the first material.

Embossing apparatus

The present disclosure is drawn to compositions and methods for a liquid electrophotographic ink printing. The composition comprises a liquid vehicle; ink particles; and a charge director system, comprising i) a primary charge component, ii) a secondary charge component, and iii) an electrical stability additive; such that the charge director system provides the following ink conductivities: a high field conductivity of about 100 pS/cm to about 500 pS/cm, a low field conductivity of about 20 pS/cm to about 200 pS/cm, a direct charge conductivity less than about 30 pS/cm, and a particle conductivity of at least 100 pS/cm. Additionally, the liquid electrophotographic ink can be formulated for printing from a liquid electrophotographic printer.

Liquid electrophotographic ink with a charge director system

In one example, a printer sheet holding system includes: a support for printable substrate sheets in a support area; and a movable indicator to indicate the presence in the support area of a second sheet stack on top of a first sheet stack. The indicator being movable between a first position in which the indicator extends over the support area where it can rest on top of the first stack when a first stack is supported in the support area and a second position in which the indicator is withdrawn from the support area. In another example, a method includes sensing the presence of a second stack of printable substrate sheets on top of a first stack of printable substrate sheets and, in response to sensing the presence of the second stack on the first stack, configuring the printer to print on sheets of the second substrate.

Sheet holder for a printer

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Petach-Tikva, Israel

Shahar Stein