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Electrophotographic cleaning blade, process for producing electrophotographic cleaning blade, and electrophotographic apparatus

一种电子照相、清洁刮板的技术，应用在电记录术、光学、仪器等方向，能够解决未说明固化层硬度等问题，达到抑制刮板翘起、光滑性改善的效果

Active Publication Date: 2009-02-11
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Japanese Patent Laid-Open Application No. 2003-122222 does not specify the hardness of the cured layer
There is a risk that the blade is lifted if the hardness is low and the drum is scratched if the hardness is too high

Method used

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  • Electrophotographic cleaning blade, process for producing electrophotographic cleaning blade, and electrophotographic apparatus
  • Electrophotographic cleaning blade, process for producing electrophotographic cleaning blade, and electrophotographic apparatus
  • Electrophotographic cleaning blade, process for producing electrophotographic cleaning blade, and electrophotographic apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] A prepolymer (NCO%: 7%) was prepared from a butylene / hexylene adipate type polyester polyol having a weight average molecular weight of 2000 and MDI. In this prepolymer, a mixed crosslinking agent of 1,4-butanediol and trimethylolpropane (mass ratio: 65:35) was mixed such that the hydroxyl group / NCO molar ratio was 0.95, thereby preparing a polyurethane raw material. Using this polyurethane raw material, a blade (IRHD: 75°) formed of a polyurethane resin having a thickness of 2 mm was produced by molding. The scraper was produced by molding using a centrifugal molding machine. In this molding, the raw material was cured under conditions of a curing temperature of 130° C. and a curing time of 30 minutes. The scraper is bonded to a plate metal to produce a cleaning scraper. In this case, the edge used to bond the scraper to the sheet metal was 5mm, and the scraper was cut so that its length along its free length was 10mm.

[0111] The cleaning blade obtained by prelimi...

Embodiment 2

[0114] A cleaning blade was produced in the same manner as in Example 1 except that the time during which the blade was kept in contact with the isocyanate compound MTL was changed to 100 minutes.

Embodiment 3

[0116] In addition to preparing the polyurethane raw material so as to have a hydroxyl group / NCO molar ratio of 0.80, changing the curing time to 20 minutes and changing the time to keep the blade in contact with the MTL to 5 minutes in molding using a centrifugal molding machine, the cleaning blade Plates were produced in the same manner as in Example 1.

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PUM

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Abstract

The invention relates to an electrophotographic cleaning blade, process for producing electrophotographic cleaning blade and electrophotographic apparatus. The electrophotographic cleaning blade is provided which is free of blade turning-up coming from both end portions of the blade in its lengthwise direction. The cleaning blade having a blade formed of a polyurethane resin, which is to come into touch with the surface of a photosensitive drum of an electrophotographic apparatus to remove a toner remaining thereon, and a support member which holds the blade. The blade has a polyurethane resin portion having a dynamic hardness of 0.05 mN / mum2 or more and 0.16 mN / mum2 or less and a high-hardness portion having a dynamic hardness 1.3 times or more and 30 times or less the dynamic hardness of the polyurethane resin portion, provided at each end portion of the blade in its lengthwise direction at its part coming into touch with the photosensitive drum.

Description

technical field [0001] The present invention relates to an electrophotographic cleaning blade (cleaning blade for electrophotography) for removing residues on an image bearing member (photosensitive drum), transfer belt, intermediate transfer It also relates to electrophotographic equipment using the cleaning blade. Background technique [0002] Electrophotographic apparatuses are provided with various cleaning blades for removing toner remaining on an image bearing member (photosensitive drum), a transfer belt, an intermediate transfer member, and the like. The scraper of this type of cleaning blade is produced with thermoplastic or thermosetting polyurethane resin or the like. They are mainly produced with thermosetting polyurethane resins in consideration of plastic deformation and wear resistance. [0003] However, when a conventional blade made of urethane resin is used, the coefficient of friction between the urethane resin and the photosensitive drum is so large tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G21/00
CPCG03G21/0017
Inventor 内田敏朗井上晶司畑中拓
Owner CANON KK
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