Vim Technologies Ltd.

Aida Porat

Michael Karp

Ehud Shchori

Sergei Bonder

Zeev Savion

Boris Brant

Sergey Bonder

Gal Tamir

Wet lithographic printing members for imaging by an inkjet printer using pigment-based aqueous ink and method for calibrating the amount of the inkjet ink to be injected in solid areas of an image are disclosed. An exemplary printing member can comprises a base substrate and a top hydrophilic coating layer having a thickness in the range of 2 to 10 microns above the base substrate. A volume of less than 10 nl/mm2 of inkjet ink is used in order to image areas in which the image is solid. Areas of the top hydrophilic coating layer, which are imagewise covered by aqueous pigmented inkjet ink, become hydrophobic. In some embodiments after imaging, the surface of the imaged printing member can be treated with acidic colloidal silica solution. Exemplary treatment can comprise wiping the surface of the imaged printing member with the acidic colloidal silica solution.

Direct inkjet imaging lithographic plates, methods for imaging and pre-press treatment

A lithographic precursor includes a hydrophilic layer that presents a surface for lithographic interaction, and which is formulated to receive a pigment-based aqueous ink deposited (e.g., by inkjet) in an 'imagewise' pattern. The compatibility between the ink and the hydrophilic layer is such that a baking step is not required for subsequent printing.

Methods of preparing lithographic printing members by imagewise deposition and precursors suitable therefor

A water based fluid that can be utilized in a standard inkjet printer to image a lithographic printing plate. The water based fluid may include a polymer that is soluble in an alkaline aqueous media and that is resistant to neutral or acidic aqueous media. In addition, the water based fluid may include a sufficient volume of water soluble material to raise the pH level higher than 8. Further, the water based fluid may include a sufficient volume of humectant co-solvents to prevent the nozzles of an inkjet printer from drying out. The water based fluid may be used to image a lithographic plate that include an inkjet ink accepting hydrophilic layer hydrophilic properties. Various embodiments of the water based fluid advantageously allow a plate to be imaged, and then without baking or adding other chemical treatments, the plate can be immediately used for printing.

Water based fluid for producing ready to press direct inkjet image-able lithographic printing plates

Embodiments of the invention are directed to a printing member for imaging with an inkjet printer using pigment-based aqueous inkjet ink. The printing member may include a substrate and a hydrophilic coating layer. The coasting layer may include acidic colloidal silica whose particles have an elongated shape, a hydrophilic polymer and a crosslinking agent.

Growing community of inventors

Kibbutz Hanita, Israel

Aida Porat