Hp Indigo B.v.

Hewlett-packard Development Company, L.P.

Dekel Green

Seongsik Chang

Sasi Moalem

Dmitry Maister

Doris Pik-Yiu Chun

A photoconductive layer in an image forming apparatus is refreshed. A first refreshing cycle is performed, including applying, at a first refresh unit, a first refresh voltage to the photoconductive layer and applying, at a second refresh unit, a second refresh voltage to the photoconductive layer. A second refreshing cycle is performed, including applying, at the first refresh unit, a third refresh voltage to the photoconductive layer, the third refresh voltage being higher than the first refresh voltage and higher than the second refresh voltage. Each of the first and second refreshing cycles electrically bias the photoconductive layer to a refresh polarity opposite to a print polarity applied during a print routine of the image forming apparatus.

Photoconductor refreshing cycles

Examples of refreshing a photoconductive layer in an image forming apparatus are described. In one example, a method includes performing a first refreshing cycle comprising applying, at a first refresh unit, a first refresh voltage to the photoconductive layer and applying, at a second refresh unit, a second refresh voltage to the photoconductive layer. A second refreshing cycle is performed including applying, at the first refresh unit, a third refresh voltage to the photoconductive layer, the third refresh voltage being higher than the first refresh voltage and higher than the second refresh voltage. Each of the first and second refreshing cycles electrically bias the photoconductive layer to a refresh polarity opposite to a print polarity applied during a print routine of the image forming apparatus.

Provided in one example herein is a liquid electrophotographic ink composition, comprising: a carrier fluid comprising a polymer; ink particles comprising pigment particles and a polymeric resin, the pigment particles comprising titanium dioxide and being distributed in the polymeric resin; and a charge director, wherein the ink particles have an average diameter of between about 10 &#x3bc;m and 50 &#x3bc;m; and the pigment particles are between about 10 wt % and about 50 wt % of the ink particles. Methods of making and using the ink composition are also provided.

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Dekel Green