Roll or roller – With specific roller exterior surface structure – Surface projections – indentations – or slits
Patent
1998-07-15
2000-11-21
Bryant, David P.
Roll or roller
With specific roller exterior surface structure
Surface projections, indentations, or slits
492 56, 492 37, 399281, 264 467, 264 469, A01B 2904
Patent
active
061495646
ABSTRACT:
A toner supply roll including a cylindrical soft polyurethane sponge structure formed on an outer circumferential surface of a metal shaft by foam molding of a polyurethane material in a mold cavity of a mold. The sponge structure having hardness of 350 g or lower includes a skin layer having a network of cells and openings open in its outer circumferential surface and communicating 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 circumferential directions of the sponge structure. Each opening has a size of 100-800 .mu.m, and a total area of the openings is at least 20% of the total surface area of the skin layer. The sponge structure has a plurality of protrusions formed on the outer circumferential surface of the skin layer so as to extend linearly or helically in the axial direction of the sponge structure. The protrusions have a height of 20-3000 .mu.m and are arranged in a circumferential direction of the sponge structure with a pitch of 300-3000 .mu.m, so that the skin layer is provided with recesses each interposed between the adjacent protrusions. Methods of producing the roll are also disclosed.
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Nozawa Akitoshi
Shiraki Keita
Bryant David P.
Butler Marc W.
Tokai Rubber Industries Ltd.
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