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Electrostatic charge image developer, process cartridge and image forming apparatus

一种静电图像显影、显影剂的技术，应用在显影剂、应用电荷图形的电记录工艺的设备、应用电荷图形的电记录工艺等方向，能够解决转印图像不均匀、球形调色剂颗粒溜走、转印难等问题，达到减少图像的不均匀和机内污染、减少不均匀和机内污染、减少再现性低下的效果

Active Publication Date: 2009-05-06
FUJIFILM BUSINESS INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For example, in the cleaning process of scraping off the toner remaining on the photoreceptor with a cleaning blade, there is a problem that spherical toner particles with small particle diameters slip through the gap of the cleaning blade and appear on subsequent images
However, in this case as well, when the electric charge per toner particle is too small, the transfer becomes difficult, resulting in uneven transfer images or voids.
In addition, regarding the adhesive force of the toner to the photoreceptor, or in other words, the resultant force from the image forming force between the toner and the photoreceptor and the intermolecular force between the toner and the photoreceptor, although the image forming force increases with Smaller particle size decreases, but intermolecular forces increase; therefore, the proportion of non-electrostatic adhesion increases
As a result, the transfer using the transfer electric field becomes more difficult

Method used

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  • Electrostatic charge image developer, process cartridge and image forming apparatus
  • Electrostatic charge image developer, process cartridge and image forming apparatus
  • Electrostatic charge image developer, process cartridge and image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0318] A developer (1) obtained by combining Carrier 1 and Toner A as shown in Table 1 was charged into a developing unit of DOCU CENTER COLOR A450 (trade name, manufactured by Fuji Xerox Co., Ltd.), and copying was performed test. First, a solid image of 2 cm×5 cm was copied in an environment of 22° C. and 50% RH, and the developer on the sleeve was sampled. The particle size and charge amount were measured by E-SPARTANALYZER, and the surface charge density distribution D represented by the formula (1) was calculated.

[0319] Next, by continuous printing, images to be described later are output on 100,000 sheets. During continuous printing, the number of pages with fogging in the background portion and the number of pages with in-machine contamination were obtained. Fogging and in-machine contamination of the background portion were evaluated based on the following criteria.

[0320] (fogging of the background part)

[0321] An image having two solid images of 2 cm x 5 c...

Embodiment 2～7

[0337] (embodiment 2~7, comparative example 1~5)

[0338] Each evaluation was performed in the same manner except that each developer obtained by combining each carrier and each toner shown in Table 1 was used instead of the developer (1) in Example 1, respectively. The results are summarized in Table 1.

[0339]

[0340] As shown in Table 1, in each embodiment, no matter in a normal temperature and humidity environment or a high temperature and high humidity environment, the fogging and internal contamination of the background part are stable, and will not cause obvious problems, and there is no problem with the image quality . On the other hand, in the comparative example, a problem occurred in at least one of the plurality of evaluation items.

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Abstract

An electrostatic charge image developer includes a toner containing an external additive and a carrier comprising a resin-coated layer formed on a surface of a core material. The average shape factor SF1 of the toner is from 125 to 135, the number of particles having shape factor SF1 of less than 125 is from 5% to 30% by number with respect to the total number of toner particles, the number of particles having shape factor SF1 of greater than 135 is from 5% to 30% by number with respect to the total number of toner particles, the scratch line width in a scratch strength test of the resin used in the resin-coated layer is from 80 mum to 200 mum, and the scratch depth is from 60 mum to 150 mum.

Description

technical field [0001] The present invention relates to an electrostatic image developer, a process cartridge and an image forming apparatus. Background technique [0002] In electrophotography, an electrostatic latent image is formed on an image holding member (photoreceptor) by charging and exposure, and then the electrostatic latent image is developed with a toner; and the developed image is transferred to a transfer receiver , and fix it by heating or the like to obtain an image. Developers used in electrophotography such as these are classified into one-component developers using only toner obtained by dispersing a colorant in a binder resin and two-component developers containing toner and a carrier . In the two-component developer, the carrier performs functions such as stirring, conveying, and charging of the developer, and since these functions are separated from those of the developer, the two-component developer has excellent controllability and is currently wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/10G03G9/08G03G21/18G03G15/01
CPCG03G9/1131G03G9/08797G03G9/1135G03G9/0819G03G9/09716G03G9/09725G03G9/08795G03G9/08755G03G9/1139G03G9/1133G03G9/0827
Inventor 清野英子山田太一鹤见洋介松本晃饭塚章洋
Owner FUJIFILM BUSINESS INNOVATION CORP
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