Telecom Italia

Sicpa Holding Sa

Francesca Pescarmona

Paolo Schina

Danilo Bich

Luigina Gino

Eliseo Chiaverina

Paolo c/o Olivetti-Jet SpA Schina

A method of manufacturing an ink jet printhead, including: arranging a nozzle plate in which there is formed a plurality of nozzles, the nozzle plate having an upper surface and a lower surface, the upper surface being on the side of the ejection of ink drops and the lower surface being opposite to the upper surface; depositing on the upper surface a first coating including a first layer including silicon carbide, while maintaining the nozzle plate at a first deposition temperature not larger than 250&#xb0; C.; depositing on the lower surface a second coating including a second layer including silicon carbide, while maintaining the nozzle plate at a second deposition temperature not larger than 250&#xb0; C.; positioning the nozzle plate onto the ink barrier layer by bringing into contact the second coating layer with the ink barrier layer. The first layer is deposited before the second layer.

Method of manufacturing an ink jet printhead

This invention relates to a method of inkjet printing, in particular for use in POS systems. In particular the printing method according to the invention is of the thermal type. In order to obtain high speed printing, for example of 15-20 lines per second when printing text on a paper medium 60-80 mm wide (for example receipts), the drops of ink ejected during the printing operation advantageously have a relatively large volume, i.e. not less than approximately 100 picoliters (pl) and preferably between 100 and 200 pl. The ink used for applications in POS systems must quickly penetrate an extensive range of paper media. This requirement is satisfied by using an ink having a surface tension of not more than approximately 35 dyne/cm (mN/m). Problems of stagnation and dripping of the ink caused by the printing conditions are overcome through the use of a nozzle plate coated with a wetting-resistant layer of silicon carbide. This coating material has proved to have non-wettability properties which do not significantly deteriorate during a printing operation over a long period of time.

Method of inkjet printing for use in point-of-sale systems

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Arnad, Italy

Francesca Pescarmona