JP4897866B2 - Coating method using roll coater - Google Patents

Description

  The present invention relates to a coating method using a roll coater apparatus capable of forming a coating having a uniform thickness on various cylindrical objects having a circular cross section.

  For example, the surface of a cylindrical object such as an OA roller used in a copying machine or a printer is coated with various coatings. This type of roller needs to be applied with a uniform coating thickness of, for example, 5 to 100 μm, and the requirements for appearance and dimensional accuracy are very high. For this reason, conventionally, a coating method using a spray device that easily achieves coating accuracy has been frequently used.

  However, in the coating method using a spray device, the paint at the time of painting is likely to be scattered to the outside, the cost of the paint is increased, and there is a drawback that the environment is deteriorated.

  On the other hand, as a method of coating a cylindrical object, various coating methods using a roll coater r as described in the following patent document have been proposed. As shown in FIG. 7 (a), the conventional roll coater r includes a paint pan a that contains the paint a1, and an application roller b that receives the paint a1 from the paint pan a and adheres it to the outer peripheral surface b1. Including. In such a coating method using the roll coater r, the application roller b and the object to be coated d are arranged in parallel with a predetermined gap g, and the two are rotated in the opposite direction and at the same peripheral speed. Is to do. When the coating material a1 is applied to the entire circumference of the object to be coated d, the object to be coated d and the application roller b are separated.

  Such a coating method using the roll coater r has the advantage of preventing paint scattering such as spray coating. However, since the application roller b and the coating object d are rotated in opposite directions, the coating material a1 cannot smoothly pass between the application roller b and the coating object d due to the surface tension of the coating material a1. The paint reservoir portion k in which the surplus paint stays easily forms on the upstream side of the proximity portion where the article d and the application roller b are closest to each other. For this reason, as shown in FIG. 7 (b), at the coating end position e of the coating object d in which the coating object d and the application roller b are separated from each other, the coating film thickness t is locally increased by the excess coating material. There is a tendency to become large. That is, the conventional coating method using the roll coater r has a problem in that it is difficult to obtain a uniform coating film and the coating accuracy is lower than the coating method using a spray device.

JP-A-2005-103482

  The present invention has been devised in view of the above problems, and is a roll that can be coated by forming a uniform-thickness coating film on various cylindrical objects having a circular cross-sectional outer periphery. The main purpose is to provide a coating method using a coater device.

The invention according to claim 1 of the present invention includes a paint pan that contains paint, and the paint is adhered to the outer peripheral surface directly or via an intermediate roll from the paint pan and the paint adhered to the outer peripheral surface is coated. A coating method for applying paint to an object to be coated having a circular outer periphery in cross section using a roll coater device including an application roller that is attached to an object and applying the coating, wherein the application roller is a paint on the outer peripheral surface possess a coating surface having a radius to be attached to the object to be coated, said a non-coated surface portion having a radius of not adhere paint to the coating object, and a step portion for escape excess paint splicing between these , in a cross-sectional view of the application roller, the stepped portion includes a straight portion extending straight radially inwardly from the end portion of the coating surface, the application roller And the object to be coated are rotated in the same direction, and the ratio So / Sa between the circumferential speed So of the object to be coated and the circumferential speed Sa of the application roller is made larger than 1.0. .

According to a second aspect of the present invention, there is provided a paint pan for containing paint, and the paint is attached to the outer peripheral surface directly from the paint pan or via an intermediate roll, and the paint attached to the outer peripheral surface is attached to an object to be coated. A coating method for applying a coating material to a workpiece having a circular outer periphery in cross section using a roll coater device including an application roller that performs coating, wherein the application roller applies the coating material on the outer peripheral surface to the coating target. An application surface portion having a radius to be adhered to the coating material, a non-application surface portion having a radius not to allow the coating material to adhere to the object to be coated, and a step portion for allowing excess paint to pass between them to be applied. In the cross-sectional view of the roller, the step portion includes a chamfered portion chamfered with a smooth arc at an end portion on the application surface portion side, and the application roller and the A coating material is rotated in the same direction, the is characterized with the peripheral speed So of the article to be coated, that a greater than 1.0 the ratio So / Sa of the peripheral speed Sa of the application roller.

According to a third aspect of the present invention, there is provided a paint pan for containing paint, and the paint is adhered to the outer peripheral surface directly or through an intermediate roll from the paint pan, and the paint adhered to the outer peripheral surface is adhered to an object to be coated. A coating method for applying a coating material to a workpiece having a circular outer periphery in cross section using a roll coater device including an application roller that performs coating, wherein the application roller applies the coating material on the outer peripheral surface to the coating target. An application surface portion having a radius to be adhered to the coating material, a non-application surface portion having a radius not to allow the coating material to adhere to the object to be coated, and a step portion for allowing excess paint to pass between them to be applied. In the sectional view of the roller, the stepped portion includes a chamfered portion chamfered with an inclined straight line at an end portion on the application surface portion side, and the application roller and the coating target Rotates the bets in the same direction, the is characterized with the peripheral speed So of the article to be coated, that a greater than 1.0 the ratio So / Sa of the peripheral speed Sa of the application roller.

A fourth aspect of the present invention is a coating method using the roll coater device according to any one of the first to third aspects , wherein the peripheral speed ratio So / Sa is set to 2.0 to 4.0 .

In the invention according to claim 5, the application roller starts adhesion of the coating material from one end portion in the circumferential direction of the application surface portion to the object to be coated, and the other end portion in the circumferential direction of the application surface portion. The coating method using the roll coater device according to any one of claims 1 to 4 , wherein the coating is performed once over the entire periphery of the object by finishing the adhesion .

  In the coating method using the roll coater device of the present invention, the application roller and the object to be coated are rotated in the same direction, and the ratio between the circumferential speed So of the object to be coated and the circumferential speed Sa of the application roller is 1.0. Larger. Thus, by setting the application roller and the object to be coated in the same direction and making the peripheral speed So of the object to be coated greater than the peripheral speed Sa of the application roller, the amount of paint pool between the object to be coated and the application roller can be reduced. It can certainly be reduced. As a result, it is possible to prevent the coating film thickness from being locally increased at the coating finish position or separation position of the coating material, thereby forming a uniform coating film.

  Further, the application roller has a coating surface portion having a radius for attaching the paint to the object to be coated, a non-application surface portion having a radius for preventing the paint from adhering to the object to be coated, and a surplus paint for escaping between them. What has a level | step-difference part is used. Such an application roller can instantaneously escape excess paint accumulated between the object to be coated and the application roller to the non-application surface portion side through the stepped portion. Therefore, it is possible to prevent the coating film thickness from locally increasing at the position where coating is completed, and to make the coating film thickness more uniform.

It is a principal part perspective view of the roll coater apparatus of one Embodiment of this invention. It is sectional drawing of FIG. 1 which abbreviate | omitted hatching. (A) thru | or (e) are sectional drawings explaining the effect | action of this embodiment. (A) And (b) is sectional drawing which shows other embodiment of a level | step-difference part. It is sectional drawing which shows other embodiment of an application roller. It is sectional drawing of the roll coater apparatus which shows other embodiment of this invention. (A) is sectional drawing which shows the conventional roll coater apparatus typically, (b) is sectional drawing of the to-be-coated object coated by it.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the roll coater device 1 used in the coating method of the present embodiment is used for coating the coating P on the outer peripheral surface HA of the workpiece H whose outer periphery is circular. It is done.

  The coating object H is not particularly limited as long as the outer periphery of the cross section is circular, but a paper feeding / conveying roller used in an OA apparatus such as a copying machine or a printer that requires high accuracy in coating film dimensions, A charging roller, a developing roller, a driving roller, and the like are preferable. In addition, as the coating material P, various materials are selected depending on the use of the article H to be coated, and any material such as an epoxy resin system or a urethane resin system can be adopted regardless of a solvent system or an aqueous system.

  The roll coater device 1 includes a paint pan 3 that contains the paint P, and an application roller 2 that attaches the paint P attached to the outer peripheral surface 2A to the article H to be coated.

  The paint pan 3 has, for example, a box shape with an open upper surface, in which liquid paint P is stored. The paint pan 3 is formed with a dimension sufficiently larger than that of the application roller 2 so that a part of the outer peripheral surface 2A of the application roller 2 can be immersed in the paint P.

  As shown in FIG. 2, the application roller 2 attaches the coating P to the coating surface H having a radius R <b> 1 that attaches the coating P adhered to the outer peripheral surface 2 </ b> A to the coating H. A non-application surface portion 6 having a radius R2 that is not allowed to be formed, and a step portion 7 that connects between the application surface portion 5 and the non-application surface portion 6 are configured. The “radius” is a diameter from the rotation center O1 of the application roller 2 to the outer peripheral surface 2A of the application roller.

  In the present embodiment, the application surface portion 5 is formed of a cylindrical surface having a single radius R1. When the coating object H is set at a predetermined position, the coating surface portion 5 is positioned so that the coating material P adhered to the outer peripheral surface 2A adheres to the coating object H.

  Further, in the present embodiment, the non-application surface portion 6 also has a single radius R2 and a cylindrical surface concentric with the application surface portion 5, and the coating P adhered to the outer peripheral surface 2A during the application is coated. In order not to adhere to the object H, it is formed sufficiently smaller than the radius R <b> 1 of the application surface portion 5. Further, the application roller 2 is preferably supported so that the non-application surface portion 6 does not come into contact with the paint P of the paint pan 3 when the application roller 2 is rotated around the rotation center O1 at the time of painting.

  As described above, the application roller 2 of the present embodiment does not attach the paint to the object to be coated using the entire circumference (360 degrees) of the outer peripheral surface as shown in FIG. 7, but is shown in FIG. Thus, the coating material P is made to adhere to the article H to be coated using the application surface portion 5 between the step portions 7 and 7 forming a part of the outer peripheral surface 2A (smaller than 360 degrees).

  Further, the stepped portion 7 provides a space for connecting the coating surface portion 5 and the non-coating surface portion 6 and releasing excess paint that tends to accumulate between the coating surface portion 5 and the article H during coating. In this example, one application roller 2 is provided with one application surface portion 5, one non-application surface portion 6, and two step portions 7 and 7 that connect between them.

  As shown in FIG. 2, in the cross-sectional view of the application roller 2, each stepped portion 7 of the present embodiment includes a straight portion 7 </ b> A extending radially outward from the end 6 e of the non-application surface portion 6, and the straight portion 7 </ b> A. And a chamfered portion 7B which is chamfered (R chamfered) with a smooth arc connecting the end portion 5e of the coating surface portion 5. By providing such a chamfered portion 7B, when the article to be coated H and the application surface portion 5 are separated from each other, excess paint between them smoothly passes through the chamfered portion 7B to the non-application surface portion 6 side. I can move.

  FIG. 3 shows a coating method of the present embodiment using the roll coater apparatus 1 configured as described above.

  FIG. 3A shows an initial state when painting is started. In this state, the application roller 2 immerses the coating surface portion 5 in the paint P in the paint pan 3 by rotation, and waits for the paint P to adhere to the outer peripheral surface 2A in advance.

  Next, the workpiece H is positioned and held at a predetermined position. At this time, the application roller 2 and the object to be coated H are predetermined according to the target coating thickness between the outer peripheral surface HA of the object to be coated H and the outer peripheral surface 2A of the application surface portion 5 of the application roller 2. The rotation centers O1 and O2 are accurately positioned so that a gap G (shown in FIG. 2) is formed. Further, as shown in FIG. 3A, in the present embodiment, the rotation centers O1 and O2 are positioned in a state where the non-application surface portion 6 of the application roller 2 and the article H are opposed to each other. .

  The gap G is appropriately determined in consideration of the viscosity of the coating material to be used, the solid content ratio, the shrinkage rate due to curing, and the peripheral speed ratio So / Sa between the peripheral speed So of the workpiece H and the peripheral speed Sa of the application roller 2. Can be determined.

  Further, for example, each of the article H and the application roller 2 is supported by an appropriate support (not shown) whose both ends are coaxial with the rotation centers O1 and O2, and is predetermined by a driving device (not shown). Can rotate at peripheral speed.

  Next, in the present invention, the application roller 2 and the workpiece H are rotated in the same direction (both counterclockwise in this embodiment). Thereby, as shown in FIGS. 3B to 3C, the application surface portion 5 of the application roller 2 approaches the object to be coated H, and the object to be coated H and the application surface portion 5 of the application roller 2 are The paint P attached to the outer peripheral surface 2A of the application roller 2 is attached to the outer peripheral surface HA of the article H in the vicinity of the closest proximity portion 11.

  Further, since the application roller 2 is provided with the stepped portion 7, the application roller 2 is applied when the outer peripheral surface HA of the object H to be coated moves from the non-application surface portion 6 to the application surface portion 5. The paint P adhering to the outer peripheral surface 2 </ b> A of the surface portion 5 can be smoothly adhered to the article H to be coated. In particular, as in this embodiment, when the stepped portion 7 includes the chamfered portion 7B chamfered in a smooth circular arc shape at the end portion 5e on the application surface portion 5 side, the coating material P can be coated more smoothly. It is desirable in that it can be attached to H.

  In the present invention, the application roller 2 and the workpiece H rotate in the same direction. For this reason, most of the paint P adhering to the application surface portion 5 of the application roller 2 adheres to the object H, and is then pulled in the rotation direction of the object H so that the object H side Therefore, the amount of the application roller 2 and the workpiece H passing through the proximity portion 11 becomes very small, and the remaining paint can pass through the gap G relatively easily. For this reason, it is possible to reduce the amount of surplus paint that tends to stay on the upstream side of the proximity portion 11 as in the prior art, and thus to obtain a uniform coating thickness.

  Furthermore, in the present invention, the ratio So / Sa between the peripheral speed So of the workpiece H and the peripheral speed Sa of the application roller 2 is set to be larger than 1.0. That is, since the peripheral speed So of the object to be coated is larger than the peripheral speed Sa of the application roller, the paint P supplied in the vicinity of the proximity part 11 can be guided and adhered more to the outer peripheral surface HA of the part to be coated H. it can. Thereby, the amount of excess paint that tends to accumulate on the upstream side of the proximity portion 11 is further reliably reduced, and it is useful for forming a coating film having a more uniform thickness.

  The peripheral speed ratio So / Sa may be larger than 1.0, but is preferably in the range of 2.0 to 4.0, particularly 3.0 to 4.0. The inventors rotated the workpiece H and the application roller 2 in the same direction and performed various coating experiments by changing the ratio So / Sa (Examples and Comparative Examples described later). As a result, it was found that when the peripheral speed ratio So / Sa is 2.0 to 4.0, a more uniform coating and a more excellent coating appearance can be obtained. That is, when the ratio So / Sa is greater than 1.0 and less than 2.0, the coating thickness can be made uniform as compared with the conventional case, but the radial flare (variation) may be slightly increased. On the contrary, if the ratio So / Sa exceeds 4.0, the relative speed difference between the article H and the application roller 2 increases, and the same phenomenon is likely to occur.

  The absolute value of the peripheral speed Sa of the application roller 2 is not particularly limited. However, if it is too large, the paint P attached to the outer peripheral surface 2A is likely to be scattered by centrifugal force, depending on the viscosity of the paint. However, if the coating accuracy is too small, the coating time becomes longer and the coating efficiency may be deteriorated. From such a viewpoint, the peripheral speed Sa is preferably 0.5 mm / s or more, more preferably 1.0 mm / s or more, and preferably 50.0 mm / s or less, more preferably 40.0 mm / s. s or less is desirable.

  Further, in the present embodiment, the application roller 2 starts the adhesion of the coating material P from the one end portion 5e1 in the circumferential direction of the application surface portion 5 to the workpiece H, and the other in the circumferential direction of the application surface portion 5 The adhesion ends at the end 5e2. Thereby, the ratio So / Sa of the peripheral speed is set so that the coating is performed once over the entire circumference (360 degrees) of the workpiece H. In other words, the peripheral length L1 of the workpiece H is set equal to the product of the peripheral length L2 of the application surface portion 5 and the peripheral speed ratio So / Sa. Thereby, when the workpiece H is rotated once, the one-time coating on the outer peripheral surface can be completed.

  In addition, when the coating is repeated two or more times on the coating object H, the coating material P applied in the first rotation is already adhered to the outer peripheral surface of the coating object H, so that the coating material adhered to the coating object H. The gap between the outer surface of T and the outer surface of the paint T adhering to the application surface portion 5 is reduced. For this reason, since the coating material P tends to accumulate in the proximity portion 11 and tends to be difficult to form a coating film having a uniform thickness, it is not preferable.

  When the rotation of the coating object H and the application roller 2 proceeds, the proximity portion 11 between the coating object H and the application roller 2 moves from the other end 5e2 of the application surface portion 5 as shown in FIG. Switch to the stepped portion 7. Thereby, while the supply of the coating material from the application roller 2 to the to-be-coated object H can be stopped, the excess coating material P of the proximity | contact part 11 can be escaped to the level | step-difference part 7 side. Therefore, the paint cutting is reliably performed without separating the object H from the application roller 2, and it is prevented that the coating thickness is locally increased at the position where the coating is finished, and the coating thickness is more reliably increased. It can be made uniform.

  In particular, as shown in FIG. 2, when the stepped portion 7 is connected to the application surface portion 5 and the non-application surface portion 6 via the chamfered portion 7B, the switching is performed more smoothly and more uniformly. It helps to form a smooth coating film. Further, the stepped portion 7 having the chamfered portion 7B can alleviate an impact when the stepped portion 7 comes into contact with the paint P when entering the paint pan 3, and excessive undulation or scattering of the paint in the paint pan 3. It is preferable in that it can be prevented.

  The radius difference R1-R2 between the application surface portion 5 and the non-application surface portion 6 of the application roller 2 is not particularly limited. However, if it is too small, the excess paint cannot be sufficiently released, so preferably 2 mm. More preferably, 5 mm or more is desirable. On the other hand, if the radius difference R1-R2 is too large, the center of gravity of the application roller 2 is greatly shifted from the rotation center O1, and it tends to be difficult to rotate at a uniform speed. From such a viewpoint, the radius difference R1-R2 is preferably 20 mm or less, more preferably 15 mm or less.

  When the coating is completed, the application roller 2 and the coating object H are separated while the non-application surface 6 faces the coating object H as shown in FIG. In addition, the process to hold | maintain the to-be-coated object H in the state rotated for predetermined time may also be added after detachment | leave. Thereby, the thickness of an uncured coating film can be averaged using gravity, centrifugal force, and self-leveling property of the coating material itself, and variations in the coating film can be further suppressed.

  With the above operation, according to the coating method of the present embodiment using the roll coater device 1, it is possible to reduce paint accumulation in the proximity portion 11 between the application roller 2 and the workpiece H. Therefore, the paint can be cut off at the finished application portion of the article H, and the local increase in the thickness of the coating film can be effectively prevented. Therefore, according to the coating method of the present embodiment, an object to be coated can be applied with a simple configuration and a uniform coating thickness.

  Further, the viscosity of the paint P is not particularly limited. However, as a result of various experiments, it is preferably 0.5 dPa · s or more, more preferably 1 when rotating at the above-mentioned ratio So / Sa. It is preferably 0 dPa · s or more, preferably 20 dPa · s or less, more preferably 10 dPa · s or less, and the best result can be obtained.

  FIGS. 4A and 4B show another embodiment of the stepped portion 7 of the application roller 2. In the embodiment of FIG. 4A, in the cross-sectional view of the application roller 2, a corner portion formed by the straight portion 7A and the application surface portion 5 is chamfered (C chamfered) by a chamfered portion 7C formed of an inclined straight line.

  Further, in the embodiment of FIG. 4B, the stepped portion 7 is configured only by a straight portion 7 </ b> A that extends linearly from the end portion 5 e of the application surface portion 5 along the radial direction. Thus, even if the stepped portion 7 is deformed in various forms, the above-described effect can be obtained. However, as shown in FIG. 2 or FIG. 4 (a), it is preferable to gradually release the excess paint from the application surface portion 5 to the stepped portion 7 in terms of further improving the coating accuracy. Moreover, these step part shapes except the step part 7 of FIG.4 (b) are useful also to distribute the stress which arises in the step part 7, and to improve the durability of the application roller 2. FIG.

  FIG. 5 shows still another embodiment of the application roller 2. In this embodiment, there is only one step portion 7 and the radius R2 of the non-application surface portion 6 is formed to be non-constant. In this example, the outer peripheral surface 2A of the non-application surface portion 6 has a radius R2 that increases with distance from the stepped portion 7, and gradually increases gradually to R1. Since such an application roller 2 can smoothly come into contact with the article H to be coated, the adhesion of the paint at the start of coating is good, and it is useful for making the coating thickness uniform.

  In the roll coater device 1 of each of the above embodiments, the paint P accommodated in the paint pan 3 is directly attached to the outer peripheral surface 2A of the application roller 2, but as shown in FIG. Needless to say, the coating material P may be adhered to the outer peripheral surface 2A of the application roller 2 with the intervening material.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the illustrated embodiments, and can be implemented in various forms.

  The object to be coated was coated under the following conditions by a roll coater apparatus having an application roller shown in FIGS. 2 and 7, and performance evaluation such as the coating thickness was performed. As a comparative example, the same evaluation is performed for a method in which the application roller and the object to be coated are rotated in opposite directions and a method in which the application roller is rotated in the same direction but the peripheral speed ratio is 1.0. It was broken. The main conditions are as follows.

Paint: Waterborne urethane resin paint Viscosity of paint: 5.0dPa · s
Material of the object: Aluminum A6063
Object radius: 12mm (before coating)
Target dry film thickness: 50 μm
Application surface radius R1: 50 mm
Peripheral length L2 of coated surface portion: adjusted to 24π / (So / Sa) mm Radius R2 of non-coated surface portion: 40 mm
Radial length of the straight part 7A of the step part: 5 mm
Curvature radius of chamfer (R chamfer): 5mm
Gap between the coated surface portion and the object to be coated: Trial coating was performed several times so as to obtain a target dry film thickness, and the thickness was adjusted within a range of 0.05 to 0.15 mm.
Radius R4 of application roller shown in FIG. 7: 50 mm
Application roller peripheral speed: 10mm / s
The number of rotations of the application roller during painting: 1 time The test method is as follows.

<Appearance inspection>
The appearance of the coated part of the coated object (after complete curing of the coating film) and the roll coater separation part (painted part) were observed with the naked eye. Evaluation was as follows.
XX: A coating swelled portion or a coating sagging portion having a width of 5 mm or more can be seen in the longitudinal direction in the coated portion / separated portion.
X: A coating bulge portion or a coating sagging portion having a width of about 2 to 5 mm can be seen in the longitudinal direction in the overlying / separating portion.
○: The above-mentioned defects are not observed in the overlaid / separated portions.

<Fresh accuracy measurement>
The object to be coated was rotated at a constant speed, and the object to be coated was rotated one or more times in the cross-sectional direction using a laser measuring machine, and the flare accuracy of the outer diameter was measured evenly 32 times. 0.05 mm or less was regarded as acceptable.

  As a result of the test, it can be confirmed that the examples have better appearance in appearance than the comparative examples, and the coating thickness is kept uniform. In various tests, when the peripheral speed ratio So / Sa was set to 5 or more, coating failure occurred and the test was stopped.

  Further, in Examples 1 to 3 (range of the peripheral speed ratio of 2.0 to 4.0), the same experiment was performed by changing the viscosity of the paint every 1.0 dPa · S in the range of 1.0 to 10 dPa · S. However, in all cases, good results almost equivalent to those in Table 1 were obtained.

DESCRIPTION OF SYMBOLS 1 Roll coater device 2 Application roller 2A Outer peripheral surface 3 Paint pan 5 Application surface part R1 Application surface part radius 6 Non-application surface part R2 Non-application surface part radius 7 Step part 7A Straight line part 7B Chamfer part 7C Chamfer part 10 Intermediate roll H P paint

Claims (5)

A paint pan for containing paint, and an application roller for applying the paint by attaching the paint to the outer peripheral surface directly from the paint pan or via an intermediate roll and attaching the paint attached to the outer peripheral surface to the object to be coated. A coating method for applying a paint to an object having a circular outer periphery in cross section using a roll coater device including:
The application roller includes an application surface portion having a radius that causes the paint on the outer peripheral surface to adhere to the object to be coated, a non-application surface portion having a radius that does not cause the paint to adhere to the object to be coated, and a surplus paint that connects between them. have a level difference portion for miss,
In the cross-sectional view of the application roller, the stepped portion includes a linear portion extending linearly inward in the radial direction from the end of the application surface portion,
The application roller and the object to be coated are rotated in the same direction, and the ratio So / Sa between the peripheral speed So of the object to be coated and the circumferential speed Sa of the application roller is set to be larger than 1.0. A painting method using a roll coater device. A paint pan for containing paint, and an application roller for applying the paint by attaching the paint to the outer peripheral surface directly from the paint pan or via an intermediate roll and attaching the paint attached to the outer peripheral surface to the object to be coated. A coating method for applying a paint to an object having a circular outer periphery in cross section using a roll coater device including:
The application roller includes an application surface portion having a radius that causes the paint on the outer peripheral surface to adhere to the object to be coated, a non-application surface portion having a radius that does not cause the paint to adhere to the object to be coated, and a surplus paint that connects between them. And a step portion for escaping
In the cross-sectional view of the application roller, the step portion includes a chamfered portion chamfered with a smooth arc at an end portion on the application surface portion side,
The application roller and the object to be coated are rotated in the same direction, and the ratio So / Sa between the peripheral speed So of the object to be coated and the circumferential speed Sa of the application roller is set to be larger than 1.0. coating method using a roll coater apparatus characterized. A paint pan for containing paint, and an application roller for applying the paint by attaching the paint to the outer peripheral surface directly from the paint pan or via an intermediate roll and attaching the paint attached to the outer peripheral surface to the object to be coated. A coating method for applying a paint to an object having a circular outer periphery in cross section using a roll coater device including:
The application roller includes an application surface portion having a radius that causes the paint on the outer peripheral surface to adhere to the object to be coated, a non-application surface portion having a radius that does not cause the paint to adhere to the object to be coated, and a surplus paint that connects between them. And a step portion for escaping
In the cross-sectional view of the application roller, the stepped portion includes a chamfered portion chamfered with an inclined straight line at an end portion on the application surface portion side,
The application roller and the object to be coated are rotated in the same direction, and the ratio So / Sa between the peripheral speed So of the object to be coated and the circumferential speed Sa of the application roller is set to be larger than 1.0. coating method using a roll coater apparatus characterized. The coating method using the roll coater device according to any one of claims 1 to 3, wherein the peripheral speed ratio So / Sa is set to 2.0 to 4.0 . The application roller starts the adhesion of the coating material from one end portion in the circumferential direction of the application surface portion, and finishes the adhesion at the other end portion in the circumferential direction of the application surface portion, thereby The coating method using the roll coater apparatus in any one of Claim 1 thru | or 4 which coats once over the perimeter of a to-be-coated article .

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