JPS63103264A - Electrophotographic toner - Google Patents

Abstract

PURPOSE:To prevent separation of an abrasive even by stirring for a long time, to keep the surface of a photosensitive drum in a state free from paper powder, oxide, and the like, and to obtain images always good in quality by burying the abrasive in the surface of an original toner composed mainly of a resin. CONSTITUTION:The resin chips, a powdery colorant, and other additives are uniformly mixed, mildly heated to convert the mixture into a softened state, and kneaded. The product is cooled and pulverized to about 10mum to form the original toner 7a, and magnetite of about 1mum particle diameter is mixed as the abrasive 7b to attach it to the surface of the original toner 7a, and buried in the surface of the original toner 7a by applying pressure to it, thus permitting the abrasive particle not to be separated from the surface of the original toner 7a even by stirring for a long time, accordingly, the original toner 7a together with the abrasive 7b to attach to the photosensitive drum, and paper powder, dust, oxide, and the like attaching to the surface of the drum to be scraped down.

Description

DETAILED DESCRIPTION OF THE INVENTION (Al Industrial Field of Application) The present invention is directed to improvements in the use of a T-printer used as a developer in an electronic image forming device. Regarding.

(bl) Conventional technology In an image forming apparatus that uses a photocopy system such as a copying machine, a two-component developer consisting of toner and carrier is used for -Jt projection. As the particles are agitated in the developer tank, they are frictionally charged with each other, and the electrostatic latent image formed on the surface of the photoreceptor drum is electrostatically charged. Is it attached to?
Furthermore, images are formed by transferring this toner to paper. However, paper particles and dust may adhere to the surface of the photoreceptor drum due to static electricity. , oxides, etc. generated by corona discharge may adhere.This paper dust, dust dioxide, etc. are difficult to remove even with a cleaning device. Image deletion may occur in the electrostatic latent image due to objects, etc., and the quality of the formed image may deteriorate or disappear.

Conventionally, powdered abrasives such as magnetite are externally added to the developer tank containing the developer and adhered to the surface of the photoreceptor drum together with the toner. The paper powder, dust, oxides, etc. were removed by the following steps.

tC101 Invention Problems) As mentioned above, in the past, powdered abrasives such as magnetite were externally added to the developer tank and thoroughly stirred together with the toner and carrier in the developer tank. How many coats of abrasive were applied to the surface of the first polisher? This abrasive is applied to the photoconductor tray 1. outwardly statically
On the surface of the toner to be applied ((1 applied to the photoreceptor 1)
It was attached to.

However, if the abrasive is externally added to the developer tank and left in the developer tank at long intervals of 11 degrees, the abrasive that had adhered to the 1-J' surface becomes liberated from the toner surface. Sometimes. As mentioned above, the 61f B5 agent adheres to the surface of the photoreceptor (=J) by adhering to the surface of the toner. /J, the surface is no longer coated with paper powder, dust, oxides, etc., which makes it impossible to remove paper powder, dust, oxides, etc., resulting in a decrease in image quality.

In this invention, by polishing the photoreceptor drum with an abrasive agent in such a way that the abrasive agent is not released even after a long period of time, the photoreceptor drum can be freed from paper powder, oxides, etc. It is an object of the present invention to provide an electrophotographic toner that can always produce images with good crystallization without the occurrence of crystallization.

The electrophotographic toner of the step-by-stage invention for solving the FDI problem is characterized in that an abrasive is embedded in the surface of the toner matrix whose main component is resin.

(e+ effect) In this invention, the abrasive is embedded in the surface of the toner matrix, and even if this toner is stirred for a long time in the developer tank, the embedded abrasive will not be released from the surface of the toner matrix. Then, the abrasive is attached to the photoreceptor drum while being embedded in the toner matrix, and polishes the surface of the photoreceptor drum.

(FIG. 3 is a schematic diagram of an electrophotographic copying machine. A photoconductor drum 1 that can rotate clockwise in the figure is disposed approximately in the center of the copying machine. Photoconductor Around the drum 1, a charging device 2, a developing device 3, a transfer/4AII separator 4, and a cleaning device 5 are arranged in the above order. The photoreceptor drum I is irradiated with light reflected from the original document.

The developer 3 has two boxes, namely developer tanks 31 and 1.
-Naponopa 32 or C-]. A developer (Developer i: J-Ra 31.) and a one-side stirring "I-Ra 311" are installed, and a knee component developer consisting of I-ner and -1-Yaria is filled. This is an electronic toner that is an embodiment of the invention.

FIG. 1(A) is a diagram showing the cross-sectional shape of this 1-ner. In the case of 1 to 7, an abrasive 7b of a magnetite shade is embedded in the surface of an I/na matrix 7a made of wood 1 finger or colored oni kerat. An example of a method for manufacturing this 1-ner will be explained. FIG. 2 is a diagram showing the production process of this toner. First, in step 1-1-, the chip-shaped resin, powdered coloring agent, etc., which will become the raw material 1'-1, are uniformly mixed using a Mi-1-1J-' mixer. The mixture is kneaded in a kneading machine by adding some heat to soften it.

This kneading is carried out using a heating kneader or the like.The kneaded product is naturally cooled.
In the process, F'A is crushed to about 11 m of IO using a hammer mill, cutter mill, jet mill, etc. In the fourth step, this pulverized product is classified to remove coarse particles and fine particles using an air classifier'' and rj. What is produced in this way is the toner matrix. Next, in the fifth step, magnetite 1~ with a particle size of about 1 μm is mixed into this toner matrix as an abrasive. Figure 1 (L'
, ) is a diagram showing this mixed state. By mixing”ζ
A polishing agent (magnetic tie 1-) 7 is applied to the surface of the toner base 7a.
b is attached. Furthermore, in the sixth step, pressure is applied to this mixture using an automatic mortar or the like, and as shown in FIG. 1(A), the toner cage 7a is
The abrasive 7b is embedded in the surface of the . In this way, I
・Nur is manufactured. In addition, in this embodiment, the toner body 7
Although pressure is only applied when embedding the abrasive 7b in the abrasive material 7a, it is also possible to embed the abrasive material 7b by applying a temperature that softens the resin of the base material 7a.

The stirring roller 31b stirs the toner and carrier to triboelectrically charge them. The developing roller 31a electrostatically adheres this frictionally charged toner to the photoreceptor drum 1. The toner hopper 32 is filled with toner. Further, a toner replenishing roller 32a is disposed at the lower opening of the toner hopper 32. I~Luna Supply II-
The roller 32a rotates when the amount of toner in the developer tank 31 decreases to replenish the amount of toner in the developer tank 31.

The cleaning device 5 is provided with a cleaning roller 51 and a cleaning plate 52. The cleaning blade F t'+ 2 scrapes off the polishing agent 7b and dust generated by polishing from the surface of each photoreceptor 1'.

Complex composed like this! In the J'' machine, the developer tank 31 +7) is mixed by the stirring roller 31b,
Each is charged with opposite polarity. At this time, in the developer tank (1), stir Toner 7 and -1-Yaria for 14 hours.
However, since the abrasive 7b is buried in the toner matrix 7a, there is no possibility that it will come loose from the toner matrix 7a.On the other hand, the surface of the photosensitive drum 1 is uniformly charged by the charger 2. , an electrostatic latent image is formed by the exposure device 6.

This electrostatic latent image is developed by +'+
If the toner 7 is electrostatically deposited to develop the electrostatic latent image. Most of this toner 7 is transferred to the paper by the transfer/separator 4 to form an image on the paper, but some remains on the photosensitive drum 1 and is conveyed to the cleaning device 5. When this residual toner 7 is rubbed against the photoreceptor drums l and 1 by the cleaning braker 51, the abrasive agent 7b embedded in the surface of the toner 7 polishes the surface of the photoreceptor drum 1. Scrape off paper powder, dust, oxides, etc. adhering to the surface. The paper dust, dust, oxides, etc. scraped in this way and the toner 7 (toner matrix 7a and abrasive 7b) form the cleaning plate F.
52 scrapes off the photoreceptor drum l.

As described above, paper dust, dust, oxides, etc. adhering to the surface of the photoreceptor drum can be removed.

(Effects of the Invention According to this invention, since the abrasive is embedded in the surface of the toner matrix, the toner is agitated for a long time in the developer tank and It will never come loose. Therefore, even if the toner is stirred for a long time, the abrasive can be applied to each photoconductor along with 11 toner particles, and this abrasive can It is possible to scrape off paper particles, dust, and oxides that have formed on the surface.
The surface of the photoconductor 1 can be kept free of paper dust, dust, oxides, etc., and the image formed will be free from disturbances and 7 defects, making it possible to form a high-quality image. .

[Brief explanation of the drawing]

FIG. 1(8) is a cross-sectional view IA of an electrophotographic toner according to an embodiment of the present invention, and FIG. 1(i) is a cross-sectional view during its manufacture.
FIG. 2 is a diagram showing the manufacturing process of this 1-toner, and FIG. 3 is a schematic diagram of a copying machine in which this toner is used. 7-toner, 7a-toner matrix, 7b-abrasive.

Claims (1)

[Claims] (1) An electrophotographic toner characterized by having an abrasive embedded in the surface of a toner matrix whose main component is resin.