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Development roller

A technology for developing rollers and intermediate layers, applied in the field of developing rollers, which can solve problems such as increased residual charge

Inactive Publication Date: 2004-10-06
SUMITOMO RIKO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the developing roller of Patent Document 1 is used, good results can be obtained in an environment of normal temperature (about 23° C.) and normal humidity (about 53%), but in a low temperature (about 15° C.) and low humidity (about 10% left and right) environment, the residual charge increases, and there is still some room for improvement to obtain high-quality images

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In order to manufacture the developing roller, the shaft body 1, the forming material (mixture) of the innermost layer 2, the forming material (coating liquid) of the intermediate layer 3, the forming material (coating liquid) of the outermost layer 4, and the A cylindrical mold for the innermost layer 2, etc. As the above-mentioned shaft body 1 , a solid cylindrical shaft body made of iron with a diameter of 8 mm was prepared.

[0029] [Preparation of the forming material (mixture) of the innermost layer 2]

[0030] Conductive silicone rubber (KE1357 A / B, manufactured by Shin-Etsu Chemical Co., Ltd.) was stirred with a paddle mixer to prepare a material (mixture) for forming the innermost layer 2 .

[0031] [Preparation of material (coating liquid) for forming the intermediate layer 3]

[0032] With respect to 100 parts by weight of H-NBR (Zaitao (ゼツト) Baolu 0020, manufactured by Japan Jieang (ゼオン) company), use 0.1 parts by weight of ion-conducting agent (trimethylo...

Embodiment 2

[0038] In the preparation of the material (coating solution) for forming the intermediate layer 3 in Example 1 above, the content of the ion-conducting agent was 0.5 parts by weight, and the content of carbon black was 35 parts by weight. Other than that, it is the same as the above-mentioned Example 1. Produced developing roller, the intrinsic volume resistance (ρv) of its interlayer 3 is 2.0×10 3 Ω cm, the volume inherent resistance (ρv) of the outermost layer 4 is 1.0×10 9 Ω·cm.

Embodiment 3

[0040] In the preparation of the material (coating liquid) for forming the intermediate layer 3 in the above-mentioned Example 1, the content of the ion-conducting agent was 1 part by weight, and the content of the carbon black was 30 parts by weight. Other than that, it is the same as the above-mentioned Example 1. The developed developing roller produced has a volume intrinsic resistance (ρv) of the interlayer 3 of 5.0×10 3 Ω cm, the volume inherent resistance (ρv) of the outermost layer 4 is 1.0×10 11 Ω·cm.

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Abstract

A developing roll, which can reduce residual charge even under environment of low temperature and low humidity, comprises a shaft 1, an innermost layer 2, an intermediate layer 3 and an outermost layer 4 provided in this order on an outer peripheral surface of the shaft, the intermediate layer including an ionic conductive agent and carbon black and having a volume resistivity (rhov) of not more than 1.0x10<6>Omega.cm and the outermost layer having a volume resistivity (rhov) of 1.0x10<7 >to 1.0x10<13 >Omega.cm.

Description

technical field [0001] The present invention relates to a developing roller used in electronic reproduction devices such as copiers and printers. Background technique [0002] In general, copying in an electronic copying apparatus is performed by forming an electrostatic latent image of a document on the surface of a photosensitive drum, adhering toner to the electrostatic latent image to form a toner image, and transferring the toner image. Secured on copy paper. The above-mentioned toner at the time of this copying is formed as follows, that is, usually, the toner in the toner cartridge is supplied to the surface of the developing roller by the toner supply roller, and the surface of the developing roller forms a plate with the toner layer opposed thereto. Rubbing charges the toner to form a toner layer on the surface of the developing roller, and the toner of the toner layer is formed by adhering to the electrostatic latent image on the photosensitive drum. [0003] How...

Claims

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Application Information

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IPC IPC(8): G03G15/08F16C13/00
CPCG03G15/0818G03G2215/0634
Inventor 山口和志近藤光由加地明彦大竹康贵
Owner SUMITOMO RIKO CO LTD
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