Imaging member having roughened surface

Details Imaging member having roughened surface Imaging member having roughened surface

1990-07-31

1993-02-16

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

430120, 355259, 355299, G03G 1316

Patent

active

051870398

ABSTRACT:
An imaging system and method are provided using an imaging member having a surface roughness which prevents the adhesion of toner particles, especially flat toner particles, during blade cleaning. The surface roughness is preferably defined by ##EQU1## and ##EQU2## wherein R is an average height of asperities of said surface, a.sub.nn is one-half the nearest neighbor distance between said asperities on said surface, K.sub.B is bulk modulus of the blade, .sigma. is Poisson's ratio of the toner composition, E is Young's modulus of the toner composition, t is an average thickness of flat particles in said toner composition, a.sub.f is an average radius of the flat particles, .mu. is an average of toner-blade and toner-surface friction coefficients, .GAMMA. is the Dupre work of adhesion between the surface and the flat particles, and .theta. is blade tip angle. The particular surface roughness prevents toner particles from developing a high surface energy on the imaging member surface.
In another embodiment of the invention, the above boundaries defining the surface roughness are further limited to a particular asperity height. The height is chosen such that small particles, such as additives, become easily cleanable by a blade.

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