HP Labs researchers create a metal-based, permanent charge roller for HP Indigo digital presses



Announced at the 2016 DRUPA international print media fair, the HP Indigo 7900 Digital Press features a new, HP Labs-engineered charge roller that many experts in the field had believed to be impossible to create.


The charge roller initiates the printing process by laying down a uniform electrical charge onto a photosensitive drum, which is then selectively discharged to form the latent image. Unlike all other commercial charge rollers, which are made from a conductive rubber exterior, HP Labs’ new charge roller is made from metal, a counterintuitive choice given that the rollers need to be highly electrically stable while in operation.

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