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Image forming apparatus, developer set, and image formign method
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A developer and image technology, applied in the direction of developer, electric recording process using charge pattern, equipment for electric recording process using charge pattern, etc., can solve the problem of white spots in the second toner image
Pending Publication Date: 2019-04-02
FUJIFILM BUSINESS INNOVATION CORP
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[0010] Furthermore, when a carrier having a higher volume resistivity than the second carrier contained in the second developer contained in the second developing device is used as the first carrier, due to the influence of the first carrier mixed in the second developing device, White spots sometimes occur on the 2nd toner image
Method used
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[0390] Hereinafter, the present embodiment will be described in detail using examples, but the present embodiment is not limited to these examples at all. In addition, in the following description, unless otherwise specified, "part" and "%" are all based on mass.
[0397] Using a sand mixer manufactured by KANSAI PAINT CO., LTD., each component except Mn-Mg ferrite particles and glass beads ( The same amount as toluene) was stirred at 1200 ppm for 30 minutes to prepare a solution 1 for forming a resin coating layer. In addition, the solution 1 for forming a resin coating layer and the Mn—Mg ferrite particles were placed in a vacuum degassing type kneader, and toluene was distill...
Embodiment B1～B6
[0527]
[0528] use figure 1 In the image forming apparatus shown (manufactured by Fuji Xerox Co., Ltd., model: Docu CentreColor 400 modified machine), the development devices 120B, 120Y, 120M, 120C, and 120K of the units 150B, 150Y, 150M, 150C, and 150K are respectively The developers shown in Table 4 were filled, and images were formed under the following conditions.
[0529] Specifically, images were output using A4-size plain paper (C2 paper, manufactured by Fuji Xerox Co., Ltd.) in a low-temperature and low-humidity environment (temperature 10° C., humidity 10%) as follows.
[0530] First, on the first day, 10,000 images of rectangular patches (patch) (5.2cm×1.2cm) with each color (ie, the five colors shown in the table) with an image density of 1% were continuously output. Then, in the first operation on the second day, after outputting 2 images based on the Japan Graphic Society Test Chart No. 5, further continuously output 10,000 rectangular patches (5.2 cm) with im...
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Volume resistivity
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Abstract
The invention provides an image forming apparatus, a developer set and an image forming method, being able to suppress white spots, of an image, formed after low density images are formed. The image forming apparatus includes: a first image forming unit that includes a first image holding member and a first developing unit, the first developing unit accommodating a first developer that includes afirst toner and a first carrier; a first transfer unit; a second image forming unit that is disposed downstream of the first image forming unit in a traveling direction of a transfer medium and includes a second image holding member and a second developing unit, the second developing unit accommodating a second developer that includes a second toner and a second carrier; and a second transfer unit, in which a volume resistivity of the first carrier is higher than a volume resistivity of the second carrier, and a volume average particle diameter of the first carrier is more than a volume average particle diameter of the second carrier.
Description
technical field [0001] The present invention relates to an image forming device, a developer set and an image forming method. Background technique [0002] The electrophotography method is to develop an electrostatic image formed on the surface of an image holder (photoreceptor) with a developer containing toner, transfer the obtained toner image to a recording medium, and transfer it to a recording medium using a heat roller or the like. A method of fixing an image. [0003] For example, Patent Document 1 discloses "a developing method by forming an electrostatic latent image on an image carrier, applying a first developer including a carrier and a toner thereto, and then applying a second developer including a carrier and a toner." Two developers are used for development, wherein the toners in the respective developers of the developers are charged to the same polarity, and the carrier resistances of the two carriers are different." [0004] Patent Document 2 discloses "...
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