Conductive rubber roller and imaging device

Abstract

The invention provides a conductive rubber roller which comprises a metal shaft core and a rubber layer wrapped on the metal shaft core, wherein the rubber layer comprises a low-hardness base layer formed by polar rubber materials and a high-hardness covering layer formed by nonpolar rubber materials formed on the outside surface of the low-hardness base layer; a softener is filled in the low-hardness base layer; and the solubility parameter Delta A of the softener filled in the low-hardness base layer, the solubility parameter Delta B of rubber components of the high-hardness covering layer, and the solubility parameter Delta C of rubber components of the low-hardness base layer have the following relational expression: (Delta A- Delta B) is greater than or equal to 2.8 (J / cm<3>)<1 / 2>; and | Delta A- Delta C | is less than or equal to 1.5 (J / cm<3>)<1 / 2>. According to the invention, the migration of the softener from the low-hardness base layer to the high-hardness covering layer is effectively prevented, and the pollution to photosensitive members is avoided in the process of using the conductive rubber roller, and therefore, both the hardness requirement of the whole rubber layer is ensured, and the conductive rubber roller has softness, the resistance fluctuation caused by environment and time changes is small, and the resistance is distributed uniformly. The invention also provides an imaging device with the conductive rubber roller.

Description

【Technical field】 [0001] The invention relates to the field of imaging equipment, and is suitable for conductive rubber rollers of imaging equipment such as electrophotographic copiers, printers and electrostatic recording equipment, especially relates to the rubber layer of the above-mentioned conductive rubber roller. 【Background technique】 [0002] With the development of electrophotographic technology, people are pursuing the printing effect. As an important original, the conductive rubber roller is expected to have high conductivity, electrical stability, low hardness, low pressure change, hardness and resistance distribution. Uniformity. [0003] The conductive roller, the developing roller, and the transfer roller are all in direct contact with the latent electrostatic image holder, so they need to have a certain degree of softness so as to maintain a certain contact with the latent electrostatic image device. [0004] In order to achieve a certain degree of softness...

AI Technical Summary

Problems solved by technology

[0006] As disclosed in CN-1379293A, a rubber roller with low hardness and stable resistance is achieved by coating an electronically conductive non-polar hard rubber layer on the surface of a sponge rubber layer, but the conductive roller of this manufacturing method is particularly The sponge layer is greatly affected by the process, and the pore size and uniformity of the sponge are directly affected by the dispersion of the cross-linking agent and pore-forming agent and the vulcanization temperature, which in turn leads to differences in the hardness and resistance of the rubber roller in the circumferential and transverse directions, affecting printing. Effect

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