Hp Indigo B.v.

Hewlett-packard Development Company, L.P.

Hewlett-packard Indigo B.v.

Noam Parvin

Albert Teishev

Yaron Grinwald

Guy Nesher

Dror Kella

Gil Bar-Haim

Ilanit Mor

Haim Yosef Cohen

Tony Azzam

Marc Klein

Emad Masoud

Gregory Braverman

Getahun Biadglin

Samer Farran

Regina Guslitzer

Yoav Landau

Tehila Ben-Ezra

Lior Joseph

Adi Vinegrad

Roi Liraz

Nir Mosenson

Yelena Litichevski

Biana Noikas

Avishai Moshel

Gilad Noy

Erez Kopel

Idan Federman

Moshe Birenboim

Ofir Bros

Vered Maagan

Gregory Braveman

In an example, a method includes identifying a contact area of a substrate within which an apparatus will make contact with the substrate and defining a boundary area of the substrate between the contact area and a remaining area of the substrate. Print agent may be printed on the substrate, wherein the print agent is printed at a first coverage in the remaining area, a second coverage less than the first coverage in the contact area; and a gradually reducing coverage across the boundary area from the first to the second coverage.

Reducing marks in print agents on substrates

Method and devices for calibrating optical density reflective color fluids to be deposited on substrate are disclosed. Some methods comprise depositing a quantity of a keying color fluid on a first region of the substrate; applying a voltage level to a reflective color fluid application device; depositing, in response to the voltage level applied, a quantity of reflective color fluid on the first region of the substrate and on a second region of the substrate; performing reflectance measurements of the first region and of the second region; performing optical density calculations as a function of the reflectance measurements; varying the voltage level applied to the reflective color fluid application device in response to said optical density calculation until the optical density calculation is within a calibrated range of optical densities.

Calibrating optical density

Example aspects described herein relate to an apparatus for adjusting control parameters of a printing substance for a printing system. Such adjustments may occur in conjunction with a color calibration process of the printing system.

Apparatus for adjusting control parameters of a printing substance for a printing system

The present disclosure relates to an electrophotographic composition that comprises a polymer resin mixture and a liquid carrier. The polymer resin mixture comprises (i) an olefin polymer A having acid and/or ester side groups and a melt index of 22 to 100 g/10 min; and (ii) an olefin polymer B having a melt index of 1 to 20 g/10 min. The olefin polymer B forms 1 to 50 weight % of the polymer resin mixture.

Electrophotographic composition

Herein is disclosed an electrostatic ink composition. In some examples, the electrostatic ink compositions comprise: a carrier liquid; a first resin; and a fluorescent pigment. The fluorescent pigment comprising a fluorescent dye and a second resin matrix, wherein the second resin is selected from the group comprising polyamide resins, polyvinylchlorides, polyolefin resins, polystyrenes, acrylonitrile-butadiene-styrene resins, polycarbonates, poly acrylic and methacrylic acid resins, polyethylene terephthalates, polyamide resins, polyurethanes, epoxy resins, silicone resins, polyester resins, alkyd resins, acrylonitrile polymers, polyesteramides or combinations thereof.

Electrostatic ink compositions

An example method of controlling a printing process in accordance with aspects of the present disclosure includes controlling an optical density of a printed image such that the optical density is increased for a predetermined portion of a leading edge of a page.

Method of controlling a printing process and controller therefor

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Nes Ziona, Israel

Noam Parvin