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Electrophotographic magnetic sealing member and electrophotographic cartridge

A technology of electrophotography and magnetic sealing, which is applied in the fields of electric recording technology using charge patterns, equipment for electric recording technology using charge patterns, and electrography, etc. It can solve problems such as toner leakage

Inactive Publication Date: 2014-02-12
CANON CHEMICALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of adding Co is prone to toner leakage due to the low intrinsic coercive force (iHc) of the magnet used as the magnetic seal

Method used

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  • Electrophotographic magnetic sealing member and electrophotographic cartridge
  • Electrophotographic magnetic sealing member and electrophotographic cartridge
  • Electrophotographic magnetic sealing member and electrophotographic cartridge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] The magnetic powder having the composition described in Table 1 and nylon 12 as a binder resin were compounded into the composition described in Table 1. The yoke member (magnetic flux converging layer) is made of stainless steel. The yoke member is disposed in the mold cavity. Subsequently, a raw material composition including magnetic powder and a resin binder is injected into a mold by an injection molding machine, thereby being molded into a shape of a magnetic sealing member.

[0082] get as figure 1 A molded product of the magnetic seal member described in , which has a resin magnet with a width of 3 mm, a magnetic flux converging layer (yoke member) with a width of 1 mm, and a circular arc with a radius R of 10.2 mm.

[0083] Magnetization is performed after molding using a magnetic field generating unit having a magnetization coil arranged at the same position as that of the magnetic pole pattern. The number of N and S magnetic poles arranged alternately in t...

Embodiment 2-9 and comparative example 1-4

[0091] The composition of the magnetic seal member is described in Table 1 and Table 2. The magnetic characteristics of the obtained magnetic sealing member are described in Table 3 and Table 4.

[0092] Evaluation was performed in the same manner as in Example 1. The results are shown in Table 5 and Table 6.

[0093] Table 1

[0094]

[0095] Table 2

[0096]

[0097] table 3

[0098]

[0099] Table 4

[0100]

[0101] table 5

[0102]

[0103] Table 6

[0104]

[0105] Table 7

[0106]

[0107] toner fogging

[0108] The toner fogging on the image was measured by a reflection densitometer (Reflectometer Model TC-6DS, manufactured by Tokyo Denshoku Co., Ltd.). The amount of toner fogging is obtained from (Ds)-(Dr), where Ds(%) represents the worst reflection density value of the white base after image formation and Dr(%) represents the average reflection density of the transfer material before image formation .

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PUM

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Abstract

Provided is an electrophotographic magnetic sealing member for sealing magnetic toner contains a magnetic material and a binder resin. The magnetic material at least includes Nd and Fe, and further includes at least one element selected from the group consisting of Sr and Ba, at least one element selected from the group consisting of Pr and La, at least one element selected from the group consisting of B, Si, In, and P, and an Al element. The magnetic material has a residual magnetic flux density of 270 mT to 500 mT, an intrinsic coercive force of 400 kA / m to 850 kA / m, and a maximum energy product of 10.0 kJ / m3 to 40.0 kJ / m3. The electrophotographic magnetic sealing member contains 3.0 parts by mass to 15.0 parts by mass of the binder resin based on 100.0 parts by mass of the magnetic material.

Description

technical field [0001] The present invention relates to a magnetic sealing member for preventing leakage of magnetic toner from a container storing magnetic toner in electrophotographic apparatus such as copiers and laser beam printers, and a cartridge for electrophotography using the same. Background technique [0002] Electrophotographic apparatuses such as copiers and laser beam printers generally include sealing members that prevent magnetic toner from flowing out of the developing areas at both ends of the developer carrying member. A non-contact magnetic sealing member utilizing magnetic attraction force is used as the member. [0003] Generally, plastic Nd-Fe-B rare earth magnets have been used as non-contact magnetic sealing members. However, the amount of magnetite added to toner has increased due to the recent decrease in the diameter of toner particles. As a result, the toner is more strongly attracted to the magnetic seal than before, causing deterioration of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/08
CPCG03G15/0942G03G15/0898G03G15/0881
Inventor 坂井启介上滝隆晃大竹淳一
Owner CANON CHEMICALS INC