JP5949854B2 - Coating apparatus and roll member manufacturing method - Google Patents

Description

  The present invention relates to a coating apparatus and a roll member manufacturing method.

  In Patent Document 1, the coating liquid for the adhesive layer is allowed to flow down on the outer peripheral surface of the core material as a rotating coated body, and the core material is applied with a blade as a smoothing member applied to the core material. A configuration in which the coating liquid is smoothed by moving from one end side to the other end side in the rotation axis direction is disclosed.

JP 2006-066511 A

  In the configuration in which the smoothing member moves relative to the coated body only from one end side to the other end side in the rotation axis direction of the coated body, the coating liquid between the coated body and the smoothing member is the smoothing member. If it protrudes from the one end portion on the upstream side in the movement direction, the coating liquid may not be smoothed, and the film thickness of the coating film may increase on one end side of the core material.

  The present invention provides a coating liquid applied to a coated body as compared with a configuration in which the smoothing member moves relative to the coated body only from one end side to the other end side in the rotational axis direction on the coating start side of the coated body. An object of the present invention is to suppress the thickening of the coating film on the one end side.

According to a first aspect of the present invention, the coating liquid is applied at the discharge position on the other end side in the end portion region including the rotating portion that rotates the object to be coated and the rotation axis direction on the coating start side of the object to be coated. A discharge portion that discharges the coating liquid to the coated body while discharging relative to the coated body from the discharge position to the other end side, and the end portion in the end region including the one end. While relatively moving with respect to the object to be coated from the initial position on the other end side to the folding position on the one end side, the coating liquid ejected from the ejection unit at the ejection position is smoothed, and from the folding position. A smoothing member that smoothes the coating liquid ejected from the ejection part on the other end side from the ejection position while moving relative to the object to be coated on the other end side.

  In the invention of claim 2, the relative movement speed of the smoothing member from the initial position to the folding position is slower than the relative movement speed of the smoothing member from the folding position to the other end side.

  In the invention of claim 3, the discharge amount per unit time when discharging at the discharge position of the discharge unit is the unit time when the discharge unit discharges while relatively moving from the discharge position to the other end side. Less than the amount of discharge per hit.

  According to a fourth aspect of the present invention, after the discharge section discharges the coating liquid at the discharge position, the discharge section once stops the discharge of the coating liquid and then moves from the discharge position to the other end side. The coating liquid is discharged onto the object to be coated while being relatively moved.

The invention according to claim 5 is that the discharging unit discharges the coating liquid to the object to be coated at a discharge position on the other end side in the end region including the one end of the rotating object in the rotation axis direction. Smoothes the coating liquid discharged at the discharge position while moving relative to the coated body from the initial position on the other end side to the folded position on the one end side in the end region including the one end . After the first step and the first step, the discharge unit discharges the coating liquid to the coated body while moving relative to the coated body from the discharge position to the other end side, and the smoothing A second step of smoothing the coating liquid ejected from the ejection position on the other end side while the member moves relative to the coated body from the folding position to the other end side.

  In the invention of claim 6, the relative movement speed of the smoothing member from the initial position to the folding position in the first step is from the folding position of the smoothing member to the other end side in the second step. Slower than relative movement speed.

  In the invention of claim 7, the discharge amount per unit time when discharging at the discharge position of the discharge portion in the first step is such that the discharge portion moves from the discharge position to the other end side in the second step. Less than the discharge amount per unit time when discharging while moving relatively.

  In the invention according to claim 8, after the discharge unit discharges the coating liquid at the discharge position, the discharge unit temporarily stops discharging the coating liquid and then moves from the discharge position to the other end side to the coated body. On the other hand, the coating liquid is discharged to the coated body while relatively moving.

  According to the configuration of the first aspect of the present invention, compared to the configuration in which the smoothing member moves relative to the coated body only from one end side to the other end side in the rotation axis direction on the coating start side of the coated body. It can suppress that the coating film of the coating liquid apply | coated to the application body thickens on the said one end side.

  According to the configuration of claim 2 of the present invention, the relative movement speed from the initial position of the smoothing member to the folding position and the relative movement speed of the smoothing member from the folding position to the other end side are the same. It is possible to suppress the coating film of the coating liquid applied to the coated body from being thickened on the one end side.

  According to the configuration of the third aspect of the present invention, the discharge amount per unit time when discharging is performed at the discharge position of the discharge unit, and the unit time when the discharge unit discharges while relatively moving from the discharge position to the other end side. Compared with a configuration in which the hit discharge amount is the same, it is possible to suppress the thickening of the coating film of the coating liquid applied to the coated body on the one end side.

  According to the configuration of the fourth aspect of the present invention, the discharge of the coating liquid at the discharge position of the discharge portion and the discharge accompanying the relative movement from the discharge position of the discharge portion to the other end side are continuously performed. As compared with the above, it is possible to suppress the coating film of the coating liquid applied to the coated body from being thickened on the one end side.

  According to the manufacturing method of claim 5 of the present invention, compared with the case where the smoothing member moves relative to the coated body only from one end side to the other end side in the rotation axis direction on the coating start side of the coated body, It can suppress that the coating film of the coating liquid apply | coated to the to-be-coated body thickens on the said one end side.

  According to the manufacturing method of claim 6 of the present invention, the relative movement speed from the initial position of the smoothing member to the folding position is the same as the relative movement speed of the smoothing member from the folding position to the other end side. Compared with the case, it can suppress that the coating film of the coating liquid apply | coated to the to-be-coated body thickens on the said one end side.

  According to the manufacturing method of claim 7 of the present invention, the discharge amount per unit time at the discharge position of the discharge unit, and the discharge amount per unit time when the discharge unit relatively moves from the discharge position to the other end side, Compared with the case where these are the same, it can suppress that the coating film of the coating liquid apply | coated to the to-be-coated body thickens on the said one end side.

  According to the manufacturing method of claim 8 of the present invention, the discharge of the coating liquid at the discharge position of the discharge portion and the discharge accompanying the relative movement from the discharge position of the discharge portion to the other end side are continuously performed. Compared with the case, it can suppress that the coating film of the coating liquid apply | coated to the to-be-coated body thickens on the said one end side.

It is a front view which shows the structure of the coating device which concerns on this embodiment. It is sectional drawing which shows typically a part of coating device which concerns on this embodiment. It is a figure which shows the preparatory process in the manufacturing method which concerns on this embodiment. It is a figure which shows the 1st application | coating process in the manufacturing method which concerns on this embodiment. It is a figure which shows the modification of a return position. It is a figure which shows the 2nd application | coating process in the manufacturing method which concerns on this embodiment. It is a figure which shows the manufacturing method which concerns on a comparative example. It is a table | surface which shows an evaluation result.

Below, an example of an embodiment concerning the present invention is described based on a drawing.
(Coating device 10)
First, the configuration of the coating apparatus 10 will be described.

  As shown in FIG. 1, the coating apparatus 10 includes a rotating device 20 as an example of a rotating unit that rotates a core material 120 as an example of an object to be coated, and a coating liquid 14 on a surface 120 </ b> A of the rotating core material 120. And a discharge device (dispenser) 30 having a discharge portion 36 for discharging.

  In addition, the coating apparatus 10 includes a blade 40 as an example of a smoothing member that smoothes the coating liquid 14 applied to the surface 120 </ b> A of the core material 120, and the discharge unit 36 and the blade 40 with respect to the core material 120. A moving mechanism 50 that moves along the direction, and a controller 60 that controls the entire coating apparatus 10 including the rotating device 20, the discharge device 30, and the moving mechanism 50 are provided.

(Core material 120)
As the core material 120, for example, a metal material such as iron, copper, brass, stainless steel, aluminum, or nickel is used. Moreover, the core material 120 is formed in columnar shape or cylindrical shape, for example. As the core material 120, a resin molded product in which conductive particles are dispersed may be used.

(Rotating device 20)
The rotating device 20 illustrated in FIG. 1 holds the axial end 125 of the core member 120 and rotates the core member 120. In the present embodiment, the rotation axis of the core member 120 is held in a horizontal state and is configured to rotate in one direction (arrow B direction).

(Discharge device 30)
As shown in FIGS. 1 and 2, the discharge device 30 includes a storage section 32 that stores the coating liquid 14, a discharge section 36 that discharges the coating liquid 14 from the nozzle 34 toward the surface 120 </ b> A of the core material 120, And a supply unit 38 for supplying the coating liquid 14 stored in the storage unit 32 to the discharge unit 36.

  The supply unit 38 includes a supply pipe 38A connected to the storage unit 32 and the discharge unit 36, and a pump 38B as a liquid supply unit that supplies the coating liquid 14 in the storage unit 32 toward the discharge unit 36 through the supply pipe 38A. And have.

  In the discharge device 30, the coating liquid 14 stored in the storage section 32 is sent to the discharge section 36 by the pump 38 </ b> B, and the coating liquid 14 sent to the discharge section 36 is transferred from the nozzle 34 of the discharge section 36 to the surface of the core material 120. It is discharged toward 120A.

(Coating solution 14)
As shown in FIGS. 1 and 2, the coating liquid 14 is a liquid that is applied to the surface 120 </ b> A of the core member 120 to form a coating film (surface layer) 16 (see FIG. 1). The coating film 16 constitutes an adhesive layer (primer), for example. In this case, the coating film 16 bonds the layer further formed on the outer peripheral surface of the coating film 16 and the core material 120.

  When the coating film 16 is formed as the adhesive layer, for example, a solution in which an adhesive is dissolved in a solvent is used as the coating liquid 14. Examples of the solvent include toluene, xylene, and other organic solvents. These may be used alone or in combination of two or more.

  Examples of the adhesive include chlorinated polypropylene resin, epoxy resin, and other resin materials. These may be used alone or in combination of two or more. The coating liquid 14 may contain a conductive agent and other additives in addition to the adhesive. Examples of the conductive agent include carbon black such as ketjen black and acetylene black, and other conductive materials.

(blade)
As shown in FIGS. 1 and 2, the blade 40 is formed in a plate shape, and is made of, for example, a metal such as stainless steel (SUS), a resin, or the like. The blade 40 is configured to smoothen the coating liquid 14 by contacting and leveling the coating liquid 14 discharged and adhered to the surface 120 </ b> A of the core member 120. Then, by smoothing the coating liquid 14 with the blade 40 in this way, a coating film (surface layer) 16 (see FIG. 1) is formed on the surface 120A of the core member 120.

(Movement mechanism 50)
As shown in FIG. 1, the moving mechanism 50 moves the discharge unit 36 and the blade 40 individually along the axial direction of the core member 120. The discharge section 36 and the blade 40 are movable in both directions of the rotation axis direction (both in the −X direction and the + X direction), and the moving speed can be changed.

  Specifically, the moving mechanism 50 includes a discharge portion support portion (not shown) that supports the discharge portion 36 and a blade support portion (not shown) that supports the blade 40, and includes a motor, a ball screw, a belt, and the like. These discharge portion support portions (not shown) and blade support portions (not support) are configured to move along the rotation axis direction of the core member 120 using a mechanical element.

  The discharge unit 36 discharges the coating liquid 14 toward the surface 120 </ b> A of the core member 120 while the discharge unit 36 and the blade 40 move along the rotation axis direction of the core member 120 rotated by the rotating device 20. Thus, the coating liquid 14 is applied in a spiral shape and the coating liquid 14 is smoothed by the blade 40.

(Control unit 60)
As shown in FIG. 1, the control unit 60 controls the entire coating apparatus 10 including the rotation device 20, the discharge device 30, and the moving mechanism 50. The control unit 60 controls the discharge amount and discharge time per unit time of the coating liquid 14 by controlling the pump 38B of the discharge device 30. The control unit 60 controls the moving mechanism 50 to individually control the moving direction and moving speed of the discharge unit 36 and the blade 40. Specifically, the control unit 60 controls the operation of the discharge unit 36 and the blade 40 as shown in the following roll member manufacturing method.

(Method for manufacturing roll member)
Next, the manufacturing method which manufactures the electroconductive roll as an example of a roll member including the application | coating process using the coating device 10 of this embodiment is demonstrated. The following control is performed by the control unit 60 as described above.

  The left side in the axial direction of the core member 120 in each figure is the application start side, and the left side direction is the −X direction (reverse running direction) (see FIG. 1). In addition, the right side in the axial direction of the core member 120 in each figure is the application end side, and the right side direction is the + X direction (forward running direction) (see FIG. 1). In addition, one axial end on the coating start side of the core member 120 is defined as one end 125, and the other axial end on the coating end side is defined as the other end 127.

  The manufacturing method includes a preparation step, a first application step as an example of a first step, a second application step as an example of a second step, and a rubber layer forming step as follows.

(Preparation process)
As shown in FIG. 1, the core member 120 is attached to the rotating device 20 of the coating device 10. As shown in FIG. 3, the nozzle 34 of the discharge unit 36 of the discharge device 30 moves to the discharge position K1 determined on the other end 127 side of the core member 120 and is positioned at the discharge position K1. The The blade 40 is moved to an initial position M1 defined on the other end 127 side of the one end 125 of the core member 120 and positioned at the initial position M1. For example, at the initial position M1, the blade 40 is located at a position where at least a part of the blade 40 (for example, a portion near the one end 45 on the application start side) overlaps the discharge position K1.

  The initial position M1 is set to a position of a distance n in the + X direction from the one end 125 of the core member 120. In the present embodiment, the distance n is, for example, 2.5 mm.

(First application process)
As shown in FIG. 4, in a state where the core member 120 is rotated by the rotating device 20, the nozzle 34 of the discharge unit 36 discharges the coating liquid 14 to the surface 120 </ b> A of the core member 120 while being located at the discharge position K <b> 1. Then, the coating liquid 14 is attached to the surface 120 </ b> A of the core material 120. In the first application process, the discharge unit 36 does not move while being located at the discharge position K1.

  The blade 40 smoothes the coating liquid 14 ejected from the nozzle 34 at the ejection position K1 while moving from the initial position M1 to the folding position M2 on the one end 125 side (in the −X direction), thereby forming the coating film 16. Specifically, the folding position M <b> 2 is set at one end 125 of the core member 120. In a state where the blade 40 is located at the turn-back position M2, at least a part of the blade 40 (a part near the other end 47 on the application end side) is located at the discharge position K1.

  Note that the folding position M2 is defined by the range in which the coating liquid 14 is applied. Therefore, when it is not necessary to apply the coating liquid 14 to the one end 125 of the core member 120, the folding position M2 is, for example, as shown in FIG. (See FIG. 1). Further, the blade 40 may be folded back at a position protruding from the one end 125 of the core member 120 to the outside (left side in FIG. 5). That is, when the one end 45 of the blade 40 is used as a reference for the position of the blade 40, the folding position M2 may be set outside the one end 125 of the core member 120 (left side in FIG. 5). When the other end 47 of the blade 40 is used as a reference for the position of the blade 40, the folding position M2 is set inside the one end 125 of the core member 120 (on the right side in FIG. 5).

  The control unit 60 (see FIG. 1) controls the moving mechanism 50 and the pump 38B (see FIG. 1) so that the film thickness of the coating film 16 falls within a predetermined range. That is, by controlling the moving mechanism 50, the reverse running speed (moving speed) of the blade 40 from the initial position M1 to the turning position M2 is adjusted. Further, by controlling the pump 38B (see FIG. 1), the discharge amount per unit time of the discharge unit 36 and the discharge time of the discharge unit 36 are adjusted. In addition, the reverse running speed (movement speed) of the blade 40 is set to a speed slower than the forward running speed of the blade 40 in the second application step described later. Further, the discharge amount per unit time of the discharge unit 36 in the first application step is set to a discharge amount smaller than the discharge amount per unit time of the discharge unit 36 in the second application step described later.

(Second application process)
As shown in FIG. 6, while the core member 120 is rotated by the rotating device 20, the discharge unit 36 moves from the discharge position K <b> 1 to the other end 127 side (+ X direction) while moving from the nozzle 34 of the discharge unit 36. The coating liquid 14 is discharged to the core material 120. In addition, the discharge of the coating liquid 14 from the nozzle 34 of the discharge part 36 is performed continuously from the 1st application | coating process.

  The blade 40 smoothes the coating liquid 14 discharged from the nozzle 34 from the discharge position K1 to the other end 127 side (+ X direction) while moving from the turn-back position M2 to the other end 127 side (+ X direction). Form. As described above, the blade 40 moved in the −X direction in the first application process is folded back at the folding position M2 and moved in the + X direction. Specifically, the blade 40 moves in the + X direction in synchronization with the movement of the discharge unit 36 in the + X direction. The moving speed of the blade 40 at this time is, for example, the same as the moving speed of the discharge unit 36.

  The control unit 60 (see FIG. 1) controls the moving mechanism 50 and the pump 38B (see FIG. 1) so that the film thickness of the coating film 16 falls within a predetermined range. That is, by controlling the moving mechanism 50, the forward running speed (moving speed) from the turning position M2 of the blade 40 to the other end 127 of the core member 120 is adjusted. Further, by controlling the pump 38B (see FIG. 1), the discharge amount per unit time of the discharge unit 36 and the discharge time of the discharge unit 36 are adjusted.

  And the discharge part 36 and the braid | blade 40 move to the other end 127 of the core material 120, and the coating film 16 is formed over the whole coating application range in the axial direction of the core material 120.

(Rubber layer forming process)
Further, a rubber layer mainly composed of conductive rubber is formed on the outer peripheral surface of the coating film 16 as an adhesive layer by extrusion molding. Thereby, the electroconductive rubber roll as an example of a roll member is manufactured. The manufactured conductive rubber roll is used as, for example, a charging roll, a transfer roll, a developing roll, a fixing roll, and a transport roll of an electrophotographic image forming apparatus. A protective layer (surface layer) may be formed on the outer peripheral surface of the rubber layer.

(Operation according to this embodiment)
The operation of the present embodiment will be described in comparison with the operation of the comparative example.

(Comparative example)
First, a comparative example in which the coating liquid 14 is smoothed while the blade 40 moves only from one end 125 of the core member 120 to the other end 127 side will be described.

  In the application method of the comparative example, as shown in FIG. 7, the discharge unit 36 and the blade 40 are positioned on the one end 125 side of the core member 120, and the discharge unit 36 is supplied with the coating liquid 14 from the nozzle 34 for a predetermined period. After the ejection, the ejection unit 36 and the blade 40 start moving in the + X direction. The reason why the discharge part 36 discharges the coating liquid 14 for a predetermined period is to prevent the coating liquid 14 from fading at one end 125 of the core member 120.

  And the coating liquid 14 is discharged to the core material 120 from the nozzle 34, while the discharge part 36 moves to + X direction. The blade 40 moves in the + X direction in synchronization with the movement of the discharge unit 36 in the + X direction, and smoothes the coating liquid 14. Thereby, the coating film 16 is formed.

  As described above, in the configuration in which the coating liquid 14 is smoothed by the blade 40, when the coating liquid 14 between the core material 120 and the blade 40 is leveled to the blade 40, the one end 45 on the coating start side of the blade 40 and the coating are applied. There is a case where it is pushed out from the other end 47 on the end side. In particular, in order to discharge the coating liquid 14 for a predetermined period in a state where the discharging section 36 is stopped on the one end 125 side of the core member 120 before the discharge section 36 starts moving in the + X direction. The coating liquid 14 is easily pushed out at the one end 45 and the other end 47 of the blade 40.

  The coating liquid 14 pushed out from the other end 47 of the blade 40 toward the + X direction is smoothed by passing through the blade 40, but the coating liquid 14 pushed out from the one end 45 of the blade 40 toward the −X direction is The film thickness of the coating film 16 on the one end 125 side of the core material 120 becomes thicker than that of other portions in the axial direction of the core material 120 without being smoothed.

(This embodiment)
On the other hand, in the present embodiment, in the first application step, the coating liquid 14 discharged from the nozzle 34 at the discharge position K1 is smoothed while the blade 40 moves from the initial position M1 to the folding position M2 on the one end 125 side. And the coating film 16 is formed.

  Accordingly, even when the coating liquid 14 ejected from the ejection unit 36 is pushed out from the one end 45 of the blade 40 toward the −X direction, the coating liquid 14 is smoothed and coated on the one end 125 side of the core member 120. The increase in the film thickness of the film 16 is suppressed. Therefore, the difference between the average film thickness of the coating film 16 from the one end 125 to the other end 127 of the core material 120 and the maximum film thickness of the coating film 16 on the one end 125 side of the core material 120 is a set desired range (for example, It is easy to adjust the film thickness of the coating film 16 so as to be within a range of 2 times or less. Thereby, also in the rubber layer (elastic layer) formed in the outer peripheral surface of the coating film 16, the film thickness increase at the one end 125 side of the core member 120 is suppressed.

  In the present embodiment, the reverse running speed of the blade 40 in the first application process is slower than the forward running speed of the blade 40 in the second application process. For this reason, compared with the case where the reverse running speed is the same as the forward running speed, the coating liquid 14 is leveled evenly in the range from the initial position M1 to the turn-back position M2, and the coating liquid 14 is smoothed. Thereby, thickening of the film thickness of the coating film 16 on the one end 125 side of the core member 120 is suppressed. On the other hand, application time is shortened because the progressive speed in the 2nd application | coating process which apply | coats the coating liquid 14 in a wider range than a 1st application | coating process is faster than the said reverse running speed. That is, in the present embodiment, in the range from the initial position M1 to the turn-back position M2 (the range in which the coating film is easily thickened), the coating liquid 14 is leveled more evenly than the shortening of the time required for smoothing the coating liquid 14. In the range from the turn-back position M2 to the other end 127 side, priority is given to shortening the time required for smoothing the coating liquid 14, and the speed is increased.

  In the present embodiment, the discharge amount per unit time of the discharge unit 36 in the first application step is smaller than the discharge amount per unit time of the discharge unit 36 in the second application step. That is, the discharge amount per unit time of the discharge unit 36 is reduced in response to the reverse running speed of the blade 40 in the first application step being slower than the forward running speed of the blade 40 in the second application step. . Thereby, the variation in the film thickness of the coating film 16 is reduced in the range from the initial position M1 to the folding position M2 and in the range from the folding position M2 to the other end 127 side. Accordingly, an increase in the thickness of the coating film 16 on the one end 125 side of the core member 120 is suppressed.

(First modification)
In the present embodiment, the discharge of the coating liquid 14 from the nozzle 34 of the discharge unit 36 is performed continuously from the first application process to the second application process without stopping, but is not limited thereto. For example, after discharge of the coating liquid 14 at the discharge position K1 in the first application step, the discharge of the coating liquid 14 from the discharge portion 36 is temporarily stopped in the second application step, and then the discharge portion 36 is discharged to the discharge position K1. The coating liquid 14 may be discharged to the core member 120 from the nozzle 34 of the discharge portion 36 while moving from the nozzle to the other end 127 side (+ X direction). The stop of the discharge is performed by stopping the driving of the pump 38B. As described above, the first modification has a discharge stop time (discharge delay time) for stopping discharge.

  The timing at which the ejection is stopped may be a period during which the blade 40 moves from the initial position M1 to the folding position M2, or may be a point in time when the blade 40 reaches the folding position M2, or the other end from the folding position M2. It may be a period for moving to the 127 side.

  Thus, the discharge part 36 once stops discharge of the coating liquid 14, the discharge amount to the core material 120 is reduced, and the adhesion amount of the coating liquid 14 adhering to the core material 120 is adjusted. For this reason, compared with the case where discharge of the coating liquid 14 from the discharge part 36 is performed continuously from the 1st application process to the 2nd application process, the thickness of the coating film 16 on the one end 125 side of the core material 120 is increased. Film formation is effectively suppressed.

(Other variations)
In the above-described embodiment, the discharge unit 36 and the blade 40 are moved along the rotation axis direction of the core member 120. However, the present invention is not limited to this. The discharge unit 36 and the blade 40 may be fixed, and the core member 120 may be moved along the rotation axis direction. Or you may move both the discharge part 36 and the braid | blade 40, and the core material 120. FIG.

  In the above embodiment, a solution in which an adhesive is dissolved in a solvent is used. However, the present invention is not limited to this. For example, the solution to be used is changed according to the coating film 16 formed on the coated body. For example, when a rubber layer as the coating film 16 is formed on the coated body, a solution in which a rubber material is dissolved is used as the solution.

  Moreover, in the said embodiment, although the core material 120 was used as a to-be-coated body, it is not restricted to this. As a to-be-coated body, the core material 120 in which the rubber layer was formed may be used, and various members can be used.

  The present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements can be made without departing from the spirit of the present invention. For example, the modification examples described above may be appropriately combined.

(Evaluation)
In this evaluation, an adhesive layer was formed using the coating methods of Examples 1 and 2 and Comparative Examples 1 and 2 below, and a charging roll was manufactured. The following “parts” means “parts by mass”.

(Preparation of charging roll)
-Preparation of core material 120-
The core material 120 made of SUM23L was plated with electroless nickel having a thickness of 5 μm, and then hexavalent chromic acid was applied to obtain a conductive substrate having a diameter of 8 mm and a length of 350 mm.

-Formation of adhesive layer-
Subsequently, the following mixture was mixed for 1 hour by a ball mill, and then an adhesive layer having a film thickness of 15 μm was formed on the outer peripheral surface of the core material 120 by using the coating methods of Examples 1 and 2 and Comparative Examples 1 and 2 below.
・ Chlorinated polypropylene resin (maleic anhydride chlorinated polypropylene resin: Super Clon 930, Nippon Paper Chemicals Co., Ltd.) 100 parts ・ Conducting agent (Carbon Black Ketjen Black EC: Ketjen Black International Co., Ltd.) 2.5 parts ・ Viscosity Toluene or xylene was used for adjustment.

-Formation of elastic layer (rubber layer)-
A mixture having the following composition was kneaded with an open roll, an elastic layer was formed on the outer peripheral surface of the core material 120 on which the adhesive layer was formed, using an extrusion molding machine, and vulcanized. As a crosshead extrusion device, a 40 mm extruder manufactured by Mitsuba Corporation and a crosshead die having a die nozzle inner diameter of 13 mm were used. Clogging of the core material 120 did not occur during extrusion molding.
・ Rubber (Epichlorohydrin ethylene oxide allyl glycidyl ether copolymer rubber, Gechron 3106: manufactured by Nippon Zeon Co., Ltd.) 100 parts ・ Conducting agent (Carbon Black Asahi Thermal: Asahi Carbon Co., Ltd.) 15 parts ・ Conducting agent (Ketjen Black EC: Ketjen Black)・ International part) 5 parts ・ Ionic conductive agent (lithium perchlorate) 1 part ・ Vulcanizing agent (sulfur 200 mesh: manufactured by Tsurumi Chemical Co., Ltd.) 1 part ・ Vulcanization accelerator (Noxeller DM: Ouchi Shinsei Chemical Industry) 2.0 parts ・ Vulcanization accelerator (Noxeller TT: manufactured by Ouchi Shinsei Chemical Co., Ltd.) 0.5 parts ・ Vulcanization accelerator auxiliary (Zinc oxide, zinc oxide 1 type: manufactured by Shodo Chemical Industry Co., Ltd.) 3 Parts ・ Stearic acid 1.5 parts

[Example 1]
In the first coating step in the above manufacturing method, as shown in the table of FIG. 8, the discharge amount and discharge time per unit time of the discharge unit 36, and the reverse travel speed and the reverse travel direction of the blade 40 And set.
In the second coating step in the above manufacturing method, as shown in the table of FIG. 8, the forward running speed of the discharge unit 36, the discharge amount per unit time and the discharge delay time (see the first modification), the blade 40 The forward running speed was set.

[Example 2]
Except for the point that the discharge of the coating liquid 14 in the second application step is continuously performed from the first application step (the point that the discharge delay time is “0”), the setting conditions are the same as those in the first embodiment. .

[Comparative Example 1]
The coating liquid 14 is applied to the core member 120 only in the second application process without performing the first application process (reverse running of the blade 40). The setting conditions in the second application process are the same as those in the first embodiment.

[Comparative Example 2]
As the first application step, the second application step is performed after the coating liquid 14 is discharged from the discharge portion 36 without performing the backward running of the blade 40. The setting conditions of the discharge unit 36 in the first application process and the setting conditions in the second application process are the same setting conditions as in the second embodiment.

(Evaluation of dimensional stability by extrusion)
The dimensional stability by extrusion molding of the charging rolls obtained in Examples 1 and 2 and Comparative Examples 1 and 2 was evaluated by evaluating the image quality as follows.
The charging roll is mounted as a charging roll on the drum cartridge of a color copying machine DocuCenter IV4475 (manufactured by Fuji Xerox Co., Ltd.), and 50% halftone is used at 10 ° C., 15% RH environment and 28 ° C., 85% RH environment with DocuCentre IV 4475. One image was printed and the image quality was evaluated according to the following criteria.
A: Density unevenness, white point, and color point are not generated.
B: Density unevenness, white spots, and color spots are only partially generated.
C: Density unevenness, white spots, and color spots are partially generated.
D: Density unevenness, white spots, and color spots are generated as a whole.

(Evaluation results)
In Example 1, the image quality (dimensional stability) was A. In Example 2, the image quality (dimensional stability) was evaluated as B. In Comparative Example 1, the image quality (dimensional stability) was D evaluation. In Comparative Example 2, the image quality (dimensional stability) was C evaluation. As described above, it was confirmed that Examples 1 and 2 were superior to Comparative Examples 1 and 2 in image quality (dimensional stability).

DESCRIPTION OF SYMBOLS 10 Application | coating apparatus 20 Rotation apparatus (an example of a rotation part)
36 Discharge unit 40 Blade (an example of a smooth member)
120 core material (an example of an object to be coated)

Claims (8)

A rotating part for rotating the object to be coated;
The coating liquid is discharged to the coated body at a discharge position on the other end side in the end region including one end in the rotation axis direction on the coating start side of the coated body, and the coated liquid is discharged from the discharge position to the other end side. A discharge unit that discharges the coating liquid to the coated body while moving relative to the coated body;
The coating liquid ejected from the ejection unit at the ejection position while moving relative to the coated body from the initial position on the other end side to the folded position on the one end side in the end region including the one end. A smoothing member that smoothes the coating liquid discharged from the discharge portion on the other end side from the discharge position while smoothing and moving relative to the coated body from the turn-back position to the other end side. When,
A coating apparatus comprising: The coating apparatus according to claim 1, wherein a relative movement speed of the smoothing member from the initial position to the folding position is slower than a relative movement speed of the smoothing member from the folding position to the other end side. The discharge amount per unit time when discharging at the discharge position of the discharge unit is smaller than the discharge amount per unit time when the discharge unit discharges while relatively moving from the discharge position to the other end side. The coating apparatus according to claim 2. The discharge part is
After discharging the coating liquid at the discharge position, once the discharge of the coating liquid is stopped, the coating liquid is moved while moving relatively from the discharge position to the other end side with respect to the coated body. The coating apparatus of any one of Claims 1-3 discharged to a to-be-coated body. The discharge part discharges the coating liquid to the application body at the discharge position on the other end side in the end area including the one end in the rotation axis direction of the application body in the rotated state, and the smoothing member includes the end part including the one end. A first step of smoothing the coating liquid discharged at the discharge position while relatively moving with respect to the object to be coated from an initial position on the other end side in the region to a folding position on the one end side;
After the first step, the discharge unit discharges the coating liquid to the coated body while moving relative to the coated body from the discharge position to the other end side, and the smoothing member is turned to the folded position. A second step of smoothing the coating liquid discharged on the other end side from the discharge position, while relatively moving from the discharge position to the coated body from the other end;
The manufacturing method of the roll member which has this. The relative movement speed of the smoothing member from the initial position to the folding position in the first step is slower than the relative movement speed of the smoothing member from the folding position to the other end side in the second step. Item 6. A method for producing a roll member according to Item 5. The discharge amount per unit time when discharging at the discharge position of the discharge unit in the first step is determined when the discharge unit discharges while relatively moving from the discharge position to the other end side in the second step. The method for manufacturing a roll member according to claim 6, wherein the discharge amount is less than the discharge amount per unit time. The ejection unit, after ejecting the coating liquid at the ejection position, temporarily stops the ejection of the coating liquid, and then moves relative to the object to be coated from the ejection position to the other end side. The manufacturing method of the roll member of any one of Claims 5-7 which discharges a coating liquid to the said to-be-coated body.