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Cleaning spade and electronic photographic device using same

An electrophotography and cleaning shovel technology, applied in the field of cleaning shovels, can solve problems such as insufficient information, and achieve the effect of small elongation and low hardness

Inactive Publication Date: 2005-05-25
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still insufficient information on drum wear and further improvements are highly desirable

Method used

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  • Cleaning spade and electronic photographic device using same
  • Cleaning spade and electronic photographic device using same
  • Cleaning spade and electronic photographic device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065]900 parts by weight of polytetramethylene glycol adipate (BA, product name: NIPPORANE 4010, manufactured by Japan Polyurethane Industry Co., Ltd.) and 100 parts by weight of polytetramethylene glycol adipate with a number average molecular weight of 2000 Ester (HA, product name: NIPPORANE 4073, manufactured by Nippon Polyurethane Industry Co., Ltd.) was mixed, and then reacted with 426 parts by weight of 4,4'-diphenylmethane diisocyanate (MDI) at 80° C. for 2 hours in a nitrogen atmosphere , thus preparing a prepolymer with an NCO% of 7%.

[0066] On the other hand, 1,4-butanediol (1,4BD) and trimethylolpropane (TMP) were mixed in a weight ratio of 65:35, and the product name was P15 (manufactured by Sankyo Air Products Co., Ltd., which is Potassium acetate dissolved in ethylene glycol, a catalyst in which the concentration of potassium acetate is 38.4% by weight) and triethylenediamine (TEDA) were added thereto, thereby preparing a hardener. Note that the blending amou...

Embodiment 2 and 3

[0074] Scrubbers were fabricated and evaluated similarly to Example 1, except that the weight ratio of BA:HA was changed as shown in Table 1. As a result, it was found that good durable images were obtained due to controlled edge chipping and rollover of the cleaning blade and reduced wear on the photosensitive drum. The obtained results are shown in Table 1.

Embodiment 4 and 5

[0076] Scrubbers were fabricated and evaluated similarly to Example 1, except that the alpha values ​​were changed as shown in Table 1. As a result, it was found that good durable images were obtained due to controlled edge chipping and rollover of the cleaning blade and reduced wear on the photosensitive drum. The obtained results are shown in Table 1.

[0077] Example 1

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Abstract

A cleaning blade mainly containing polyurethane resin, which is mainly provided in an electrophotographic device for wiping and removing residual toner, controls chipping of the cleaning blade tip and reduces abrasion of a photosensitive drum. By mixing and hardening a prepolymer obtained at least from butanediol adipate polyester polyol, hexanediol adipate polyester polyol and polyisocyanate and a hardener including low molecular weight polyol and potassium acetate , so that the molar ratio (α value) of the hydroxyl group and the isocyanato group is not less than 0.7 and not more than 0.9.

Description

technical field [0001] BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to cleaning blades for image forming apparatuses such as electrophotographic copiers, laser printers, facsimile machines, etc., using electrostatic transfer technology. Background technique [0002] Electrophotographic copiers and laser printers make copies by adhering toner to an electrostatic latent image formed on a photosensitive drum and conveying it on copy paper. As one of the methods of eliminating toner remaining on the photosensitive drum after copying, the cleaning shovel method has been put into practical use. [0003] So far, polyester-based polyurethane elastic materials have been used as a material for cleaning shovels, which have excellent mechanical properties such as abrasion resistance, etc., and little or no creep properties (permanent deformation due to resistance to stress). ), in which thermosetting polyurethane resins have been used. [0004] Gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G21/10C08G18/12C08G18/16C08G18/42G03G21/00
CPCC08G18/12C08G18/163C08G18/4238G03G21/0017Y10T428/24488C25D5/14C25D7/04C25D5/02C08G18/3206A63H1/20
Inventor 三浦俊成冈部贵子畑中拓井上晶司仲野直彦
Owner CANON KK