| 摘要 |
A sponge roll, such as a toner supply roll, a transfer roll, a cleaning roll, a developing roll and a charged roll which are used for a copier and a printer which utilize an electrophotographic system. The sponge roll has a shaft member, and an elastic sponge layer, at least a part of an outer circumferential surface of the shaft member being formed as a rough surface having a ten-point average roughness (Rz) of 5-300 mu m, the elastic sponge layer being integrally molded with the shaft member on the outer circumference of the shaft member without interposing a layer of a bonding agent therebetween. Merely forming a specific rough surface on the shaft member and molding the shaft member and elastic sponge layer together enable a large adhesive strength to be obtained therebetween, so that the sponge roll can sufficiently deliver a higher operating speed and a higher durability required by an electrophotographic copier, the sponge roll requiring no layer of a bonding agent between the shaft member and elastic sponge layer, unlike a conventional sponge roll, whereby it becomes possible to prevent oozed-out bonding agent which causes contamination, and render troublesome steps, such as a bonding agent application step and a bonding agent drying step unnecessary, i.e., simplify the sponge roll manufacturing steps. <IMAGE> |
