Original scientific paper In liquid toner electrophotography, colour gamut is often diminished in the yellow region leading to problems with photo quality prints. It is known that the concentration of pigment particles in the printing ink and its thickness when applied on a paper substrate decisively influence final print quality. Variation of these two parameters for the yellow process ink was...

Hewlett-Packard (HP) is actively engaged in external and internal research to ensure that deinkability of the current recycled paper streams is maintained as the percentage of digital prints in deinking mill furnish increases. As part of this effort HP is working to understand how ink and paper interactions for both inkjet and liquid electrophotography affect the flotation deinking process. Res...

The performance of rollers for charging, development, and transfer processes in electrophotography depends critically on dielectric relaxation of the semi-insulating dielectric layers in these devices. In these layers, the progress of dielectric relaxation is controlled by the charge injection from bias and the charge mobility, rather than by the bulk resistance. Based on the physical principle...

Identifying a forged printed document with scanned evidence can be challenge. Microscopic printing is showing random shape which depends on the source as well material. This paper presents statistical analysis of patterns under microscopic scale, analyses effect direction, substrate (uncoated and coated paper), technology (conventional offset, waterless electrophotography). The shows negligible...