Toner supply roll having openings in skin layer of porous cylind

Details Toner supply roll having openings in skin layer of porous cylind Toner supply roll having openings in skin layer of porous cylind

1997-02-03

1998-06-16

Pendegrass, Joan H.

Electrophotography

Image formation

Development

264 467, 264 469, 492 37, G03G 1508

Patent

active

057686688

ABSTRACT:
A toner supply roll including a metal shaft and a cylindrical soft polyurethane sponge structure formed on an outer circumferential surface of the metal shaft by foam molding of a polyurethane material in a mold cavity of a mold. The sponge structure having a hardness of 350 g or lower includes a skin layer having generally smooth surface and openings, and a network of cells. The openings are open in the smooth surface and communicate with respective ones of the cells located adjacent to the skin layer, such that the openings are substantially aligned with central portions of the respective ones of the cells in axial and radial directions of the sponge structure. Each opening has a size within a range of 100-800 .mu.m, and a total area of the openings is at least 20% of a total area of the smooth surface of the skin layer. The method of producing the roll is also disclosed.

REFERENCES:
patent: 4696255 (1987-09-01), Yano et al.
patent: 4788570 (1988-11-01), Ogata et al.
patent: 5311264 (1994-05-01), Kinoshita
patent: 5655197 (1997-08-01), Okada et al.

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