JP2010058001A - Method for coating developing roller with coating solution and coating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of streak trouble or irregularity in a formed coating layer in a method of coating the developing roller with a coating solution for moving the core metal of the developing roller, which is inserted into the masking member having a cylindrical shape arranged on the inside of a coating solution tank housing the coating solution, and bringing the coating solution housed in the coating solution tank with the parts successively exposed from the end part of the masking member of the core metal of the developing roller to coat the successively exposed parts, and to provide a coating apparatus capable of executing this coating method. <P>SOLUTION: The core metal of the developing roller, which is inserted into the masking member having the cylindrical shape arranged on the inside of the coating solution tank housing the coating solution, is moved and the coating solution housed in the coating solution tank is brought into contact with the parts successively exposed from the end part of the masking member of the core metal of the developing roller to coat the successively exposed parts. The inner wall of the masking member is brought into contact with the whole outer periphery of the core metal of the developing roller. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a developing roller coating liquid coating method and a coating apparatus for forming a desired layer by coating a coating liquid on the outer peripheral surface of a developing roller mandrel when manufacturing a developing roller used in an electrophotographic image forming apparatus.

  A developing roller used in an electrophotographic image forming apparatus, for example, a copying machine or a printer, has a roughened surface in order to carry the developer on the surface.

  When roughening the surface, a method of forming a base rubber layer on the outer periphery of the developing roller core as a material of the developing roller and polishing the outer peripheral surface, or roughness imparting particles on the outer periphery of the developing roller core A technique for obtaining a roughened surface by applying a coating solution in which is dispersed is proposed (Patent Document 1). A method of applying a coating liquid in which roughness imparting particles are dispersed is a preferable method for obtaining a uniformly roughened surface.

  By the way, there are various coating methods such as a dip coating method and a ring coating method as a method of coating a coating liquid on a coated body forming a shaft body such as a developing roller core.

  The dip coating method is a coating method in which a coated body is immersed in a coating liquid storage tank containing a coating liquid, the coated body is brought into contact with the coating liquid, and the coating liquid is attached to the surface of the coated body. It is.

  The dip coating method is a coating method suitable for coating on the surface of an object to be coated having a complicated shape, but it is necessary to immerse the object to be coated in a coating solution for a certain period of time. There is a risk that the time of contact with the coating solution becomes long and the surface of the coated body swells or dissolves. Further, since a large amount of coating solution is required, it is not suitable for small-scale production.

  In addition, the ring coating method, in which the coating liquid is supplied from the periphery of the coated body through the slit and coated, has a short time for the coated body to contact the coating liquid, so that the surface of the coated body is swollen or dissolved. Although there is no danger of clogging, there is a risk of clogging in the slits when applying a coating liquid in which coarse particles are dispersed.

  As a coating method that can avoid such problems of the dip coating method and ring coating method, the object to be coated is inserted into a cylindrical masking member disposed inside a coating liquid tank that stores the coating liquid. There has been proposed a coating method in which a coating liquid stored in a coating liquid tank is brought into contact with a portion that is moved and sequentially exposed from an end of a masking member of an object to be coated (Patent Document 2).

  FIG. 8 is a schematic diagram illustrating an example of a configuration of a coating apparatus to which the coating method disclosed in Patent Document 2 is applicable. In FIG. 8, the coating device is shown in cross section.

  The coating apparatus shown in FIG. 8 has a coating liquid P in a space formed by an outer wall 113 that surrounds the masking member 112 that is also an inner wall, and a bottom surface member 111 that connects the outer wall 113 and the masking member 112 at the bottom. The coating solution tank 110 is accommodated. As shown in the figure, the masking member 112 is arranged in a form that penetrates the coating solution tank 110 in the vertical direction. The upper end of the masking member 112 is configured to be lower than the upper end of the outer wall 113.

  The coating liquid tank 110 is connected to the pump 300 and the tank 200 via a coating liquid supply pipe 410 connected to the bottom member 111.

  The tank 200 contains the coating liquid P, and the pump 300 is operated to feed the coating liquid contained in the tank 200 to the coating liquid tank 110 via the coating liquid feed pipe 410. be able to. Reference numeral 420 denotes a recovery pipe that guides the coating liquid P flowing out beyond the upper end of the outer wall 113 to the tank 200.

  FIG. 9 is a schematic diagram for explaining coating of a coating solution by the coating method disclosed in Patent Document 2.

  In starting the application, first, the object to be coated W is inserted into the hollow portion of the masking member 112 by a not-illustrated object moving means, and the masking member 112 is partially exposed from the upper end. This state is shown in FIG. Next, the pump 300 is operated to feed the coating liquid P stored in the tank 200 until the liquid level exceeds the upper end of the masking member 112 of the coating liquid tank 110. This state is shown in FIG. As shown in the figure, the coating liquid P that has reached the liquid level exceeding the upper end of the masking member 112 in the coating liquid tank 110 contacts (wettes) the body W to be coated.

Next, the coating liquid P is brought into contact with the outer peripheral surface of the coating body W exposed to the coating liquid tank 110 sequentially from the upper end of the masking member 112 by raising the coating body W at a constant speed. the coating liquid layer P _P sequentially coating solution P on the surface of the member to be coated W is attached, which is pulled from is formed. This state is shown in FIG. Thus, the surface of the member to be coated W drawn up in an arrow direction from a liquid surface coating solution layer P _P of the coating solution P adhering is formed, i.e., the coating solution P is applied.

  The coating liquid P in the coating liquid tank 110 is always supplied by the pump 300 until the liquid level exceeds the upper end of the outer wall 113. Part of the coating liquid P supplied until the upper end of the outer wall 113 is exceeded flows out beyond the upper end of the outer wall 113 and returns to the tank 200 via the coating liquid recovery pipe 420. Therefore, the liquid level of the coating liquid P supplied to the coating liquid tank 110 is maintained at a substantially constant height, and the coating is performed with a difference in height between the upper end of the masking member 112 and the upper end of the outer wall 113. The body W is contacted (wetted). By pulling the coated body W upward at a constant speed while bringing the coating liquid P into contact (wetted) with the width of the difference between the upper end of the masking member 112 and the upper end of the outer wall 113. The coating liquid P can be adhered to the surface of the object W to be coated to a desired thickness, and a coating layer having a desired thickness can be formed through a drying process.

  Since the coating method disclosed in Patent Document 2 described above has a short contact time between the object to be coated W and the coating liquid P, there is a problem in the dip coating method (the surface is swollen, there is a risk of dissolution, and a large amount of processing liquid is required. )), And a slit is not required as in the ring coating method, so that a clogging or the like is not generated even when a coating liquid in which roughness particles are dispersed is applied. It is.

  As described above, the coating method disclosed in Patent Document 2 is also a preferable coating method for applying a coating liquid in which particles having a predetermined particle diameter are dispersed on an object to be coated. It is preferable as a coating method for obtaining a coating layer having a desired surface roughness by coating a coating liquid in which particles having a particle size of 1 are dispersed.

  By the way, in the coating method disclosed in Patent Document 2, in order to smoothly move the member to be coated, the masking member 112 and the member to be coated W need to be opposed to each other through a gap.

  FIG. 10 is an enlarged view of a gap portion between the masking member 112 and the workpiece W in the coating method disclosed in Patent Document 2.

  As shown in the figure, the coating liquid P contacts the air through the gap. The coating liquid P is obtained by dissolving a resin, which is a solvent, in an organic solvent at a predetermined ratio. Therefore, when the coating liquid P comes into contact with air, the solvent component evaporates and the composition of the coating liquid changes. Therefore, the composition of the coating liquid that comes into contact with the air in the gap portion changes.

  In the case of the coating liquid in which the roughness imparting particles are dispersed, the dispersion density of the roughness imparting particles in the vicinity of the air contact portion is increased when the solvent is evaporated in the air contact portion. In particular, when the dispersion density of the particles imparting roughness of the coating liquid near the gap portion increases, the particles aggregate to form a particle lump, which causes streak failure in the coating layer formed by obstructing the contact of the coating liquid with the member to be coated. This may cause the coating liquid having increased dispersion density of the roughness imparting particles to come into contact and cause abnormalities such as coating unevenness.

From such a background, it is suitable for coating liquids in which roughness-imparting particles are dispersed, and there is a risk of swelling or dissolving the surface of the coated body without causing clogging, streak failure or uneven coating. A coating film forming method that does not generate such a demand is desired.
JP 2002-357949 A JP 2001-276701 A

The developing roller cored bar inserted into the cylindrical masking member disposed inside the coating liquid tank for storing the coating liquid is moved, and the developing roller cored bar is sequentially exposed from the end of the masking member. In the coating solution coating method of the developing roller for coating the coating solution stored in the coating solution tank in contact with the coating solution,
The present invention provides a developing roller coating liquid coating method that does not cause streak failure and unevenness in the formed coating layer, and a coating apparatus capable of performing the developing roller coating liquid coating method.

The above problem is solved by the following means.
(1) The developing roller cored bar inserted into a cylindrical masking member disposed inside the coating liquid tank for storing the coating liquid is moved to sequentially expose from the end of the masking member of the developing roller cored bar. In the coating liquid application method of the developing roller for applying the coating liquid stored in the coating liquid tank in contact with the part to be applied,
A developing liquid coating method for a developing roller, wherein an inner wall of the masking member is in contact with the entire outer circumference of the developing roller core.
(2) The developing roller coating liquid coating method according to (1), wherein the coating liquid is obtained by dispersing resin particles.
(3) a coating liquid tank that stores the coating liquid, and a masking member that is disposed inside the coating liquid tank and has a cylindrical shape into which a developing roller core can be inserted;
The developing roller mandrel is inserted into the masking member and moved so that the coating solution stored in the coating solution tank is applied to the portion of the developing roller mandrel that is sequentially exposed from the end of the masking member. In the coating device,
The coating apparatus according to claim 1, wherein the masking member is in contact with the entire outer periphery of the developing roller core.
(4) the masking member, the minimum inner diameter _{d M} is, when said outer diameter of the developing roller core metal was used as _{d W,} characterized in that it is a 0.7d _W ≦ _{d M} ≦ 1.0d _W The coating apparatus as described in said (3).
(5) The coating apparatus according to (3) or (4), wherein the masking member is made of a fluororesin or a perfluoroelastomer.

According to the present invention, the developing roller core metal inserted in the masking member having a cylindrical shape arranged inside the coating liquid tank for storing the coating liquid is moved, and sequentially from the end of the masking member of the developing roller core metal. In the coating liquid coating method of the developing roller for coating the coating liquid stored in the coating liquid tank in contact with the exposed portion,
In particular, when applying a coating liquid in which resin particles are dispersed, a coating liquid coating method and a coating apparatus for a developing roller that do not cause streak failure or unevenness in the formed coating layer can be provided.

  A coating apparatus to which the developing solution coating method for the developing roller of the present invention can be applied will be described below.

  FIG. 1 is a schematic view of a coating apparatus to which the developing roller coating liquid coating method of the present invention can be applied.

  A coating apparatus 100 shown in FIG. 1 includes a coating liquid tank 110, a recovery tank 120, a tank 200, a pump 300, a coating liquid supply pipe 410, and a coating liquid recovery pipe 420.

  The coating liquid tank 110 has an annular shape having a bottom surface member 111 having an opening 111H in the center, a masking member 112 having a cylindrical shape arranged around the opening 111H, and an outer wall 113 surrounding the masking member 112. It is a container body. The masking member 112 is disposed so as to penetrate the coating solution tank 110 in the vertical direction. The height of the upper end of the outer wall 113 having a cylindrical shape is configured to be higher than the height of the upper end of the masking member 112.

  Further, the recovery tank 120 is a container body having an annular plane in which the outermost wall 121 having a cylindrical shape higher than the outer wall 113 surrounds the outer wall 113 of the coating liquid tank 110 and is arranged on the bottom member 111. It is.

  One end of a coating liquid supply pipe 410 is connected to the bottom surface member 111 in the coating liquid tank 110. The other end of the coating liquid supply pipe 410 is connected to the tank 200, and the coating liquid tank 110 and the tank 200 communicate with each other through the coating liquid supply pipe 410. The pump 300 is arranged in the middle of the coating liquid supply pipe 410. The tank 200 stores the coating liquid P, and the coating liquid P stored in the tank 200 is fed to the coating liquid tank 110 through the coating liquid feed pipe 410 by the pump 300.

  A coating liquid recovery pipe 420 is connected to the outer wall 121 of the recovery tank 120, and the recovery tank 120 and the tank 200 communicate with each other through the coating liquid recovery pipe 420. The coating liquid P in the recovery tank 120 returns to the tank 200 through the coating liquid recovery pipe 420.

  The outer wall 113 that separates the coating liquid tank 110 and the recovery tank 120 is provided with a communication hole 113H that allows the coating liquid tank 110 and the recovery tank 120 to communicate with each other. The opening / closing plate 113B is a member that can be disposed at a position where the communication hole 113H is opened and closed by an opening / closing plate moving means (not shown).

  When the opening / closing plate 113B is disposed at a position that opens the communication hole 113H, the coating liquid P in the coating liquid tank 110 and the collection tank 120 can freely move through the communication hole 113H. When the opening / closing plate 113B is disposed at a position to close the communication hole 113H, the movement of the coating liquid P in the coating liquid tank 110 and the collection tank 120 through the communication hole 113H is blocked.

  FIG. 2 is a diagram for explaining the masking member 112.

As shown in FIG. 2, the masking member 112 is a cylindrical body having circular openings at the upper end and the lower end. The inner diameter of the inner wall at the upper end is d ₁ , and the inner diameter at the lower end is d ₂ (d ₂ > d ₁ ). And the cone part connected to an upper end part is formed in the thin wall of equal thickness. Further, the inner diameter dimension d ₂ is set to the same dimension as the opening of the bottom surface member 111 in the coating apparatus 100.

  The lower end portion of the masking member 112 is fixed to the bottom surface member 111 by fastening means (not shown) with the central axis thereof coinciding with the center of the opening of the bottom surface member 111.

  The masking member 112 is made of an elastic material, for example, a fluororesin or a perfluoroelastomer. Here, “having elasticity” means that when an external force is applied, it deforms according to the applied external force, and when the external force is removed, it has a property of restoring to its original shape.

The upper end of the masking member 112 is at a minimum inner diameter portion, the inner diameter d ₁ of the inner wall is minimal inner diameter d _M of the masking member noted in the appended claims. Inner diameter _{d 1,} when the external dimensions of the member to be coated was _{d W,} comprised in the range of _{0.7d W ≦ d 1 ≦ 1.0d W} .

The masking member 112 is made of a material having elasticity such as fluororesin or perfluoroelastomer, and the inner diameter dimension d ₁ is configured in a range of 0.7 d _W ≦ d ₁ ≦ 1.0 d _W , thereby masking. When the object to be coated is inserted into the inner diameter portion of the member 112, the opening at the upper end of the masking member 112 is expanded by the object to be coated, and the inner wall of the opening comes into contact with the entire outer periphery of the object to be coated. And a to-be-coated body can be smoothly moved to the central-axis direction, contacting the inner wall of an upper end opening part over a perimeter.

  By using the coating apparatus 100, the developing roller coating liquid coating method of the present invention can be executed.

  The developing roller coating method of the present invention will be described below with reference to FIGS.

  The coating method of the present invention is performed through the following steps.

First Step: Inserting the Developing Roller Core R FIG. 3 is a view showing a state where the developing roller core R is inserted into the masking member 112. As shown in FIG. 3, the developing roller core R as the coated body is inserted into the masking member 112 in a state where the opening / closing plate 113B is disposed at a position where the communication hole 113H is closed. The developing roller core R as the coated body may be a metal material or may be formed by previously forming another layer on the metal material.

Dimensions of the developing roller core metal R is _{d W,} the inner diameter _{d 1} of the inner wall of the upper opening of the masking member 112 is _{0.7d W ≦ d 1 ≦ 1.0d W} . When the developing roller mandrel R is inserted from the opening 117H of the bottom member 111, the upper end opening of the masking member 112 formed of an elastic material is expanded by the developing roller mandrel R and the inner wall is developed. Contact is made over the entire outer circumference of the roller core R.

Second Step: Supply of Coating Solution P Next, the coating solution P stored in the tank 200 is supplied to the coating solution tank 110 via the coating solution supply pipe 410.

  Since the opening / closing plate 113B is arranged at a position to close the communication hole 113H, the movement of the coating liquid P fed to the coating liquid tank 110 to the recovery tank 120 through the communication hole 113H is blocked. The liquid level of the coating liquid P fed to the coating liquid tank 110 rises.

  The liquid level raised by supplying the coating liquid P to the coating liquid tank 110 exceeds the upper end of the masking member 112 and exceeds the upper end of the outer wall 113.

  The coating liquid that exceeds the upper end of the outer wall 113 flows into the collection tank 120.

  FIG. 4 is a view showing a state in which the liquid level of the coating liquid P supplied to the coating liquid tank 110 exceeds the upper end of the masking member 112 and further exceeds the upper end of the outer wall 113.

  Since the coating liquid P in the coating liquid tank 110 whose liquid level has exceeded the upper end of the outer wall 113 flows out to the recovery tank 120 beyond the upper end of the outer wall 113, the liquid level of the coating liquid P in the coating liquid tank 110 is The height of the outer wall 113 is kept substantially equal to the upper end. The outer peripheral surface of the developing roller metal core R exposed from the upper end of the masking member 112 is in contact with the coating liquid P maintained at a liquid level substantially equal to the upper end of the outer wall 113 in the coating liquid tank 110.

  Since the inner wall of the upper end opening of the masking member 112 is in contact with the entire outer peripheral surface of the developing roller core R, the coating liquid P does not penetrate into the inner diameter portion of the masking member 112, and the contact portion Since there is no gap, no contact is made with air at the contact portion.

Third step: Application of coating liquid P When the liquid level of the coating liquid P fed to the coating liquid tank 110 exceeds the upper end of the masking member 112, the developing roller core R is attached to an unillustrated substrate. It is moved upward at a constant speed by the moving means.

  When the developing roller mandrel R is moved upward at a predetermined speed, the developing roller mandrel R sequentially exposed from the upper end of the masking member 112 comes into contact with the developing roller mandrel R, and the coating liquid P adheres to the outer peripheral surface. In the state, it is pulled upward from the coating solution tank 110.

  FIG. 5 is a view showing a state in which the developing roller core R is pulled upward from the coating solution tank 110.

Upward from the coating solution tank 110 to the surface of the developing roller core metal R which is pulled (arrow), the coating layer P _P is formed the coating solution P adhering.

  The coating liquid P that has flowed into the recovery tank 120 beyond the upper end of the outer wall 113 of the coating liquid tank 110 returns to the tank 200 through the return coating liquid recovery pipe 420, and is fed again to the coating liquid tank 110, where the developing roller core. It is used for the application of gold R.

Fourth step: Stop supplying the coating liquid P and discharging it from the coating liquid tank 110 When the coating liquid P is applied to a desired range of the developing roller core R, the movement of the developing roller core R is stopped, After the supply of the coating liquid P to the coating liquid tank 110 is stopped and the open / close plate 113B is disposed at a position where the communication hole 113H is opened to discharge the coating liquid P in the coating liquid tank 110, the developing roller core The gold R is removed from the upper end opening of the masking member 112.

  FIG. 6 shows a state where the coating liquid P in the coating liquid tank 110 is discharged.

Fifth step: removal of developing roller core R The developing roller core R is removed from the masking member 112 in a state where the coating liquid P in the coating liquid tank 110 is discharged. Even if the developing roller core R is removed from the masking member 112 in this state, the coating liquid P does not flow out from the upper end opening of the masking member 112 to the bottom surface side of the coating liquid tank 110.

Above, the coating solution P to the developing roller core metal R by the first to fifth steps is applied, it is possible to form a coating liquid layer P _P on the outer periphery of the developing roller core metal R.

  As described above, in the coating liquid coating method of the present invention, since the inner wall of the upper end opening of the masking member 112 in the coating liquid tank 110 is in contact with the developing roller core R over the entire circumference, the masking member 112. There is no gap in the contact portion of the developing roller core R. Therefore, unlike the conventional coating method, when the coating liquid P comes into contact with air in the gap, the solvent content of the coating liquid P is not evaporated and the composition of the coating liquid P is not changed. Further, even when the coating liquid P is a dispersion of roughness imparting particles, the solvent is evaporated in the gap as in the conventional coating method, and the dispersion density of the roughness imparting particles is increased. There is nothing. Therefore, the particle lump posted by the aggregation of the particles does not interfere with the contact of the coating liquid with the member to be coated and does not cause a streak failure in the coating layer or abnormalities such as coating unevenness. .

  When applying to the plurality of developing roller cores R, the coating liquid P can be applied to the plurality of coated objects by repeating the first to fifth steps.

  In the coating method and the coating apparatus described above, the developing roller mandrel is charged one by one to form the coating layer. When applying a plurality of developing roller cores R, it is necessary to repeatedly supply and discharge the coating liquid P to and from the coating liquid tank 110 each time one developing roller core R is inserted and removed. Efficient coating can be performed by using a cored bar connected to the developing roller cored bar as an object to be coated. This will be described below.

Figure 7 is a diagram for explaining a core metal connecting member R _Cn linked to the development roller core metal.

  7A shows the developing roller core R, and FIG. 7B shows the connecting member C.

The developing roller metal core R may be made of a metal material, or a layer made of a different material on the outer peripheral surface of the metal material. The outer diameter of the outer peripheral portion of the developing roller core metal R is d _W. The developing roller core R has protrusions _Rb at both ends. The protrusion _Rb is a part that functions as a rotating shaft of the developing roller when the developing roller core R is incorporated in the image forming apparatus as the developing roller.

Connecting member C shown in cross section in FIG. 7 (b), outer diameter forms a cylindrical same d _W and the outer peripheral portion of the developing roller core metal R. Then, at both ends in the axial direction with the fitting portion C _b to be fitted to share respective central axes in the projecting portion R _b of the developing roller core metal R.

  The connecting member C is formed by using a material that is not dissolved in the solvent of the coating liquid P, such as perfluoroelastomer, fluororesin, polyethylene, polypropylene, polyimide resin, or POM. It is preferable.

  The core metal connector is obtained by alternately connecting the developing roller metal core R and the connecting member C.

FIG. 7 (c) is a diagram illustrating one of the developing roller core metal R and unit core metal connecting body R _C1 formed between one of the connecting members C.

As described above, the outer diameter of the outer peripheral portion Ca of the connecting member C includes a developing roller core metal are the same d _W and the outer peripheral portion of R, and a connecting member C and the developing roller core metal R, each of the protrusions by connecting the Rb and the fitting portion Cb, and the connecting member C and the developing roller core metal R may form a unit core metal connecting body R _C1 of the outer diameter d _W.

The unit core metal connector R _C1 can be connected to another unit metal core connector R _C1 to form a core metal connector R _Cn . The symbol n attached to the symbol R _Cn means the number of connected unit core metal assemblies R _C1 .

Figure 7 (d) is a diagram showing the two unit core metal connecting body core metal connecting member R _C2 formed by connecting R _C1. As shown, the core metal connecting body R _C2 is those formed by linking the two units core metal connecting body R _C1, further units core metal connecting member R _C1, is connected one after another be able to.

Coating device 100 is applying the coating solution P through the first to fifth steps and the same steps in the coating liquid coating method of the developing roller core metal R described above into the outer peripheral surface of the core metal connecting body R _Cn it can.

Application of the coating liquid P to the cored bar assembly R _Cn by the coating apparatus 100 is “developing roller cored bar R” described in the first to fifth steps in the method of applying the coating liquid to the developing roller cored bar R described above. May be replaced with “core metal connector R _Cn ”, and a new description is omitted.

Incidentally, the core metal connecting member R _Cn to be introduced into the coating apparatus, even those that are formed in a separate line, in conjunction with the operation of the coating device may be intended to be formed on-line operation.

The cored bar assembly _RC pulled up from the coating solution tank 110 is separated into the developing roller cored bar R and the connecting member C on which the coating layer _PP is formed. The separated connecting member C is reused after removing the coating layer on the outer peripheral portion Ca.

Each time the developing roller core metal R is inserted and removed as in the case where a plurality of developing roller core metals R are applied one by one by introducing a coupled coated body as an object to be applied to the coating apparatus. The supply and discharge of the coating liquid P to the coating liquid tank 110 need not be repeated, and the supply and discharge of the coating liquid P to and from the coating liquid tank 110 can be performed when the core metal connector _RCn is inserted and removed. Therefore, it is possible to efficiently form a coating layer of a large amount of the developing roller core R. In particular, when the cored bar assembly R _Cn is formed by online operation in conjunction with the operation of the coating apparatus, it can be formed by connecting a plurality of unit cored bar assemblies R _C1 endlessly. Since the coating layer formation to the metal core R can be continuously performed, it is preferable.

And also when apply | coating core metal coupling body RC, since the inner wall of the upper end opening part of the masking member 112 in the coating liquid tank 110 is contacting over the perimeter of the outer periphery of core metal coupling body _RCn , a masking member There is no gap in the abutting portion between 112 and the core metal connector _RCn, and the solvent of the coating liquid P evaporates due to the contact between the coating liquid P and air in the gap, and the composition of the coating liquid P There is no such thing as changing. Even when resin particles are dispersed as roughness-imparting particles in the coating liquid, the particle lump displayed by the aggregation of the particles interferes with the contact of the coating liquid on the core metal connector R _Cn and is applied. It does not cause streak failure in the layer or abnormalities such as coating unevenness.

  In the developing roller coating liquid coating method according to the present invention, the coating liquid P in which resin particles having a particle diameter of 0.5 μm to 20 μm are dispersed can be preferably applied.

  Hereinafter, the results of applying the coating solution to the developing roller core by applying the present invention will be described.

1. Developing roller core R: SUS303 shaft with outer diameter (= d _w ) of 16.0 mm.

  2. Coating solution P: In 400 parts by mass of methyl ethyl ketone (MEK), 100 parts by mass of urethane resin (Nipporan 5120 manufactured by Nippon Polyurethane Co., Ltd.), 30 parts by mass of furnace black, 20 parts by mass of crosslinked acrylic resin particles having an average particle size of 10 μm, Made by mixing and dispersing.

3. Coating device: The coating device 100 shown in FIG. 1 is used. Masking member 112 is a perfluoroelastomer the material, the opening size d ₁ of the upper end was produced having different three types.

Masking member (a): d _1a = 11.2 mm
Masking member (b): d _1b = 12.8 mm
Masking member (c): d _1c = 16.0 mm
The relationship between the opening dimension d _{1a at the} upper end of the masking member (a) and the outer diameter dimension d _W (= 16.0 mm) of the developing roller core is d _1a = 0.7d _W. Similarly, the opening dimension _{d 1b} of the upper end of the masking member (b), the relationship between the outer diameter _{d W} of the developing roller core _metal, d 1b = 0.8d _W, opening dimension of the upper end of the masking member (c) The relationship between d _1c and the outer diameter d _W of the developing roller core is d _1c = 1.0 d _W.

Masking member (a), it is (b), (c) opening dimension _d 1a of the respective upper _{ends, d 1b,} d _1c, with respect to the outer diameter _{d W} of the developing roller core metal R, respectively, 0.7d _W , 0.8d _W, which are set to 1.0d _W, the masking member (a), (b), (c) , both of which, the opening at the upper end when the developing roller core metal R is inserted The inner wall contacts the entire circumference of the developing roller core R.

  4). Application of coating liquid P: A total of 100 developing roller cores R are supplied to each of the coating devices 100 incorporating the masking members (a), (b), and (c), and their peripheral surfaces The coating solution P was applied to form a coating layer.

  Example 1 is a developing roller mandrel coated with a coating device 100 incorporating a masking member (a), and Example is a developing roller mandrel coated with a coating device 100 incorporating a masking member (b) 2. The developing roller core bar applied by the coating apparatus 100 incorporating the masking member (c) was defined as Example 3.

  5. Evaluation of coating layer: Examples 1 to 3, 100 coating layers were confirmed visually to check for streak failure and unevenness.

  6). Evaluation results: Examples 1 to 3, no streak failure or unevenness was observed in any of the 100 coating layers.

It is a schematic diagram of the coating device which can apply the coating liquid coating method of the developing roller of the present invention. It is a figure explaining the masking member. FIG. 4 is a view showing a state where a developing roller core R is inserted into a masking member 112. FIG. 4 is a view showing a state in which the liquid level of the coating liquid P supplied to the coating liquid tank 110 exceeds the upper end of the masking member 112 and further exceeds the upper end of the outer wall 113. FIG. 4 is a view showing a state where the developing roller core R is pulled upward from the coating solution tank 110. The state where the coating liquid P in the coating liquid tank 110 is discharged is shown. It is a diagram illustrating a core metal connecting member R _Cn linked to the development roller core metal. It is a schematic diagram explaining an example of a structure of the coating device which can apply the coating method disclosed by patent document 2. FIG. It is a schematic diagram explaining application | coating of the coating liquid by the coating method disclosed by patent document 2. FIG. FIG. 10 is an enlarged view of a gap portion between a masking member 112 and an object to be coated W in a coating method disclosed in Patent Document 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Application | coating apparatus 110 Coating liquid tank 111 Bottom member 112 Masking member 113 Outer wall 113B Opening and closing plate 113H Communication hole 120 Recovery tank 121 Outermost wall 200 Tank 300 Pump 410 Coating liquid supply pipe 420 Coating liquid collection pipe R Developing roller core metal C Connecting member R _Cn cored metal W W substrate P coating liquid

Claims (5)

The developing roller cored bar inserted into the cylindrical masking member disposed inside the coating liquid tank for storing the coating liquid is moved, and the developing roller cored bar is sequentially exposed from the end of the masking member. In the coating solution coating method of the developing roller for coating the coating solution stored in the coating solution tank in contact with the coating solution,
A developing liquid coating method for a developing roller, wherein an inner wall of the masking member is in contact with the entire outer circumference of the developing roller core. 2. The coating liquid coating method for a developing roller according to claim 1, wherein the coating liquid is a dispersion of resin particles. A coating solution tank that stores the coating solution, and a masking member that is disposed inside the coating solution tank and has a cylindrical shape into which a developing roller core can be inserted,
The developing roller mandrel is inserted into the masking member and moved so that the coating solution stored in the coating solution tank is applied to the portion of the developing roller mandrel that is sequentially exposed from the end of the masking member. In the coating device,
The coating apparatus according to claim 1, wherein the masking member is in contact with the entire outer periphery of the developing roller core. The masking member has a minimum inner diameter _{d M} is, when said outer diameter of the developing roller core metal was used as _{d W,} claim 3, characterized in that the 0.7d _W ≦ _{d M} ≦ 1.0d _W The coating apparatus as described in. The coating apparatus according to claim 3 or 4, wherein the masking member is made of a fluororesin or a perfluoroelastomer.

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