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Rubber composition, paper feed roller, and image forming device

A rubber composition and rubber technology, which are applied in the direction of electric recording process applying charge pattern, equipment and object supply, etc. problem, to achieve the effect of small permanent elongation and excellent wear resistance

Active Publication Date: 2017-12-19
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Therefore, the structure of Patent Document 2 has the problem that the hardness of the paper feed roller is lowered.
In addition, there is a problem that filler oil and paraffin oil tend to seep out on the outer surface of the paper feed roller, and if they seep out, the coefficient of friction μ decreases, causing poor paper feeding.

Method used

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  • Rubber composition, paper feed roller, and image forming device
  • Rubber composition, paper feed roller, and image forming device
  • Rubber composition, paper feed roller, and image forming device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] (Preparation of rubber composition)

[0121] As the rubber component, 30 parts by mass of high-ethylene EPDM [NORDEL (NODERU, registered trademark) IP4770R manufactured by Dow Chemical Company, ethylene content: 70%, diene content: 4.9%] and 70 parts by mass of low-ethylene EPDM [ ESPRENE (registered trademark) 505A manufactured by Sumitomo Chemical Co., Ltd., ethylene content: 50%, diene content: 9.5%].

[0122] The ratio of high ethylene EPDM is 30% by mass in the total amount of rubber components. These two types of EPDM were further blended with the components shown in Table 1 below, and kneaded to prepare a rubber composition.

[0123] 【Table 1】

[0124] Table 1

[0125] Element

parts by mass

carbon black

30

Ground calcium carbonate

30

peroxide crosslinking agent

3

Crosslinking Auxiliary

2

[0126] The ingredients in Table 1 are as follows:

[0127] Carbon black: HAF, filler, trade name SEAST 3 manufact...

Embodiment 2

[0135] Except that the amount of high-ethylene EPDM was 50 parts by mass and the amount of low-ethylene EPDM was 50 parts by mass, a rubber composition was prepared in the same manner as in Example 1, and a paper feed roller 1 was manufactured.

[0136] The ratio of high ethylene EPDM is 50% by mass in the total amount of rubber components.

Embodiment 3

[0138] Except that the amount of high-ethylene EPDM was 70 parts by mass and the amount of low-ethylene EPDM was 30 parts by mass, a rubber composition was prepared in the same manner as in Example 1, and a paper feed roller 1 was manufactured.

[0139] The ratio of high ethylene EPDM is 70% by mass of the total amount of rubber components.

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Abstract

A rubber composition contains a higher ethylene content EPDM and a lower ethylene content EPDM as a rubber component. The proportion of the higher ethylene content EPDM is 30 to 80 mass % based on the overall amount of the rubber component. The rubber composition is less susceptible to reduction in friction coefficient μ and has a proper hardness, a smaller permanent elongation and an excellent abrasion resistance after crosslinking. Therefore, the rubber composition is suitable for a sheet conveying roller and an image forming apparatus incorporating the sheet conveying roller.

Description

technical field [0001] The present invention relates to a rubber composition suitable for forming a paper feed roller for paper feeding in an image forming apparatus such as an electrostatic copier, a paper feed roller formed using the rubber composition, and an image forming apparatus equipped with the paper feed roller . Background technique [0002] For example, a paper feed mechanism in an image forming apparatus such as an electrostatic copier, a laser printer, a plain paper facsimile machine, and a multifunction machine of these is equipped with a paper feed roller. [0003] Examples of paper feed rollers include paper feed rollers, conveyance rollers, platen rollers, and discharge rollers that rotate while contacting paper (including plastic films, etc., hereinafter the same) to convey paper by friction. [0004] As the paper feed roller, materials made of various rubbers such as natural rubber (NR), polyurethane rubber, ethylene propylene diene rubber (EPDM), polyno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/16C08K13/02C08K5/14C08K3/04C08K3/26B65H5/06
CPCB65H5/06C08L23/16C08L2205/025C08L2312/00C08K5/14C08L19/00G03G15/6511G03G15/6552G03G2215/00683G03G15/6529
Inventor 峯章弘田村俊裕兵头建彦
Owner SUMITOMO RUBBER IND LTD
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