Coating method and coating apparatus

Abstract

To provide a coating method and apparatus that can uniformly apply paint to the outer surface of a cylindrical or columnar object to be coated using a simple and inexpensive method. [Solution] A method for coating a cylindrical or cylindrical object to be coated, comprising: a rotation step of rotating the cylindrical or cylindrical object to be coated about its axis; and a coating step of spraying paint from a spray nozzle onto the outer surface of the object to be coated while moving a spray filled with paint at a constant speed parallel to the axis of the rotating object to be coated, wherein the coating step includes a step of controlling the movement speed of the spray by the movement speed of a light point.

Description

Technical Field

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[0005] , <000,003> The present invention relates to a coating method and a coating apparatus for a cylindrical or columnar object to be coated.

Background Art

[0002] Some coating methods for cylindrical or columnar objects to be coated have been proposed. In Patent Documents 1 and 2, a method of rotating a cylindrical or columnar object to be coated in the axial direction and applying a coating material to the outer peripheral surface of the object to be coated while moving a nozzle parallel to the axial direction is described.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, Patent Documents 1 and 2 do not disclose a mechanism or a control method for moving a nozzle parallel to the long axis direction of the object to be coated. When moving the nozzle manually, there is a problem that the coating amount on the outer peripheral surface varies and uniform coating cannot be achieved. Also, when automatically controlling the nozzle movement, although uniform coating is possible, there is a problem that the introduction cost is high. An object of the present invention is to provide a coating method and a coating apparatus that can uniformly apply a coating material to the outer peripheral surface of a cylindrical or columnar object to be coated at a low cost by a simple method.

Means for Solving the Problems

[0005] The present invention relates to the following. [1] A rotating step of rotating a cylindrical or columnar object to be coated about the axis of the object to be coated, and The process includes a coating step in which a spray nozzle is used to spray paint onto the outer surface of a rotating object to be coated, while moving a spray filled with paint at a constant speed parallel to the axis of the object to be coated. The spray's movement speed in the coating process is controlled by the flashing speed of the light. A method for applying coating to a cylindrical or columnar object. [2] The coating step according to [1], wherein the step of aspirating an organic solvent sprayed from a spray nozzle is performed simultaneously with the coating step. [3] The coating method according to [1] or [2], wherein the speed of movement in the coating process is controlled by manually moving the spray in accordance with the speed of movement of the light spot. [4] The application method according to any one of items [1] to [3], wherein the spray movement speed in the application process is 10 mm to 100 mm / second. [5] The coating method according to any one of items [1] to [4], wherein the amount of paint sprayed during the coating process is 0.10 to 1.0 g / second. [6] The coating method according to any one of [1] to [5], wherein the rotation speed of the object to be coated in the rotation process is 10 to 100 rpm. [7] The spray angle of the paint spray nozzle from the spray onto the object to be coated is 30 to 60° with respect to the vertical direction of the central axis of the object to be coated. The application method described in any one of the items [1] to [6]. A method for manufacturing a cylinder or cylindrical object whose outer surface is coated with paint, comprising the coating method described in any one of the items [8] [1] to [7]. A cylindrical or cylindrical object obtained by the manufacturing method described in [9] [8], wherein the outer surface is coated with paint.

[10] A rotating mechanism for fixing a cylindrical or columnar object to be coated and rotating the object about its axis, A moving mechanism for moving the sprayer that sprays the paint, It includes a light flashing display unit in which light flashes while flowing in one direction at a constant speed. The moving mechanism and the flashing light display unit are installed parallel to the axial direction (long axis direction) of the object to be coated, which is fixed to the rotating mechanism. The moving mechanism has a range of motion that coincides with at least both ends of the long axis of the object to be coated, The light flashing display unit has a length that coincides with at least both ends in the longitudinal direction of the object to be coated. Coating device. [Effects of the Invention]

[0006] According to the present invention, it is possible to provide a coating method and a coating apparatus that can uniformly apply paint to the outer surface of a cylindrical or columnar object to be coated in a simple and inexpensive manner. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view (with cover open) of a painting apparatus according to one embodiment of the present invention. [Figure 2] This is a perspective view (with cover closed) of a painting apparatus according to one embodiment of the present invention. [Figure 3] This is a schematic diagram of a light flashing display unit according to one embodiment of the present invention. [Modes for carrying out the invention]

[0008] (Coating device) Figures 1 and 2 illustrate one embodiment of the present invention. Figure 1 is a perspective view of the coating apparatus with the top cover and side cover open, and Figure 2 is a perspective view with the top cover and side cover closed.

[0009] The coating apparatus 1 of the present invention includes a rotation mechanism 3 that fixes a cylindrical or columnar object to be coated 2a with a central axis fixing device 2b and rotates the object to be coated 2a around its axis, A sprayer 5a for spraying paint is fixed on a transport plate 5c, and a moving mechanism 5b moves the sprayer 5a. It comprises a light flashing display unit 4a in which the flashing light moves in one direction at a constant speed. The moving mechanism 5b and the light flashing display unit 4a are installed parallel to the axial direction (long axis direction) of the object to be coated 2a, which is fixed to the rotating mechanism. The moving mechanism 5b has a movable range that at least coincides with both ends of the coated object in the major axis direction of the coated object. The light point blinking display unit 4a has a length that at least coincides with both ends of the coated object in the major axis direction.

[0010] The coated object 2b is fixed with the central axis of the coated object 2b by the central axis fixture 2b, and when the rotating mechanism 3 rotates at a constant speed, the coated object 2b also rotates at a constant speed. The rotating mechanism 3 is not particularly limited, and any rotating mechanism may be used as long as it can fix the axial surfaces at both ends of the coated object and rotate the central axis. Examples of such a rotating mechanism include a method of connecting a motor to the rotating shaft of the coated object. When using a motor, it can be directly connected or decelerated by a belt, gear, etc., and the rotation speed can be varied by electronic control. The motor drive can be electric, pneumatic, or hydraulic.

[0011] After setting the coated object 2b in the coating device 1 and closing the upper cover 10a and the side cover 10b, the parts other than the opening 5d become a closed space. When spraying paint from the spray 5a with the nozzle of the spray 5a inserted into the opening 5d, by sucking air from the suction port 30 at that time, it is possible to prevent the volatilization of the organic solvent generated by the spraying of the spray and prevent the exposure of the organic solvent to the operator. The moving mechanism 5b of the spray is installed parallel to the axial direction (major axis direction) of the coated object 2b and has a movable range that at least coincides with both ends of the coated object 5b in the major axis direction. It is preferably installed in a movable range wider than both ends of the coated object 5b in the major axis direction. The entire outer peripheral surface (both ends) of the coated object 2b can be uniformly coated.

[0012] The moving mechanism 5b of the spray is preferably installed on the outer surface of the side cover 10b of the coating device. Also, when the spray is fixed to the transport plate on the moving mechanism, the moving mechanism 5b is preferably installed at a position where the distance between the spray nozzle and the outer peripheral surface of the coated object 2a is 100 to 500 mm, and particularly preferably installed at a position where the distance is 150 to 300 mm. Further, the spray moving mechanism 5b is preferably installed at a position where the installation angle of the spray nozzle with respect to the object to be coated 2a is 30 to 60 degrees with respect to the vertical direction of the central axis of the object to be coated, and particularly preferably installed at a position where it is 40 to 50 degrees. By setting it within the above range, the paint can be uniformly applied to the entire outer peripheral surface of the cylindrical or columnar object to be coated.

[0013] A transport plate 5c is installed on the moving mechanism 5b, and the spray 5a can be installed on a spray holder attached to the transport plate 5c. The moving mechanism 5b is not particularly limited, and examples include a mechanism for manually moving on a guide rail and a mechanism for rotating a ball screw with a motor (for example, a mechanism in which the motor rotates in conjunction with the blinking speed of the light point blinking display section 4a described later). However, a mechanism for manually moving on a guide rail is preferred. This is because the mechanism is simple, the manufacturing cost is low, and maintenance is easy without the need for an electric drive unit or control equipment. When the moving mechanism 5b is a guide rail, it is preferably a linear roller type guide rail using bearing rollers. It can move smoothly laterally with a light force.

[0014] The light point blinking display section 4a is installed parallel to the axial direction (long axis direction) of the object to be coated 2b and has a length that at least coincides with both ends in the long axis direction of the object to be coated. Further, the light point blinking display section 4a is installed on a fixture 4b of the light point blinking display section installed parallel to the axial direction (long axis direction) of the object to be coated 2b. The light point blinking display section 4a is preferably installed on the outer surface of the upper cover 10a of the coating device. The light point blinking display section 4a is not particularly limited as long as it has a light point blinking display section in which light moves in a certain direction at a certain speed. As the light point blinking display section 4, for example, a commercially available tape-shaped LED tape light equipped with a mechanism in which the blinking portion moves can be used.

[0015] The movement speed of the flashing light in the light flashing display unit 4a may be variable or fixed, but a fixed speed is preferred. This is because it does not require a control device, is inexpensive, and requires no maintenance. When using LED strip lights with a fixed movement speed, the actual distance traveled by the light can be adjusted by wrapping the LED strip light tightly in a spiral around the light flashing display fixture 4b, thereby controlling the apparent movement speed of the coated object 2b in the longitudinal direction. For example, if an LED strip light (15 mm wide, 30 mm pitch of LED lights) 4a' is wrapped tightly in a spiral around a φ30 mm cylinder (light flashing display fixture 4b), the apparent movement speed of the light can be reduced to about 1 / 6 (see Figure 3).

[0016] (Application method) The present invention's method for applying coatings to cylindrical or columnar objects is as follows: A rotation step in which a cylindrical or columnar object to be coated is rotated around the axis of the object to be coated, The process includes a coating step in which a spray nozzle is used to spray paint onto the outer surface of a rotating object to be coated, while moving a spray filled with paint at a constant speed parallel to the axis of the object to be coated. The movement speed of the spray in the coating process is controlled by the movement speed of the light point.

[0017] (Rotation process) In the rotation process, the cylindrical or columnar object to be coated is rotated around its axis. By performing the coating process described later while the cylindrical or columnar object to be coated is rotating, the paint can be uniformly applied to the entire outer surface of the cylindrical or columnar object to be coated. The rotation speed of the object to be coated during the rotation process is preferably 10 to 100 rpm, more preferably 20 to 80 rpm, even more preferably 30 to 80 rpm, and particularly preferably 40 to 75 rpm. By keeping the rotation speed within this range, it becomes easier to adjust the spray movement speed and the amount of paint sprayed during the coating process described later, and the paint can be applied uniformly to the entire outer surface of the object to be coated. The size of the cylindrical or columnar object to be coated is not particularly limited, but considering workability, it is preferable that the diameter of the object to be coated is 100 to 500 mm and the length is 200 to 4000 mm.

[0018] (Coating process) The coating process involves spraying paint onto the outer surface of the rotating object to be coated by moving a spray nozzle filled with paint at a constant speed parallel to the axis of the object to be coated. The speed of the spray is controlled by the speed of the light point. The spray can is not particularly limited, and commercially available spray cans, airbrushes or spray guns connected to paint tanks can be used, but spray cans are preferred from the standpoint of ease of handling. By attaching a commercially available spray can holder to a transport plate installed on a guide rail, spray cans can be replaced with a single touch. By rotating the cylindrical or columnar object to be coated and performing the coating process while controlling the spray's movement speed, the paint can be uniformly applied to the entire outer surface of the cylindrical or columnar object to be coated.

[0019] The method for controlling the spray's movement speed based on the light point's movement speed is not particularly limited; for example, the spray can be moved in accordance with the movement speed of the LED strip light's light point. The method for moving the spray is not particularly limited; for example, a ball screw (for example, a ball screw with a mechanism in which the motor rotates in conjunction with the light point's movement speed) or manual movement are possible, but from the standpoint of low cost, it is preferable to manually move the spray in accordance with the light point's movement speed. The spray's movement speed during the coating process is preferably 10 to 100 mm / second, more preferably 20 to 90 mm / second, even more preferably 30 to 80 mm / second, and particularly preferably 40 to 70 mm / second. By keeping the speed within this range, it is easy to manually move the spray in accordance with the movement speed of the light spot, and the paint can be uniformly applied to the entire outer surface of the object to be coated.

[0020] The spray angle of the spray applied to the object to be coated is preferably 30 to 60 degrees, and more preferably 40 to 50 degrees, with respect to the vertical direction of the central axis of the object to be coated. By keeping the angle within this range, the paint can be uniformly applied to the entire outer surface of the cylindrical or columnar object to be coated.

[0021] The amount of paint sprayed during the coating process is preferably 0.10 to 1.0 g / second, more preferably 0.2 to 0.9 g / second, even more preferably 0.3 to 0.8 g / second, and particularly preferably 0.4 to 0.8 g / second. By setting it to 0.1 g / second or more, the required amount of paint can be uniformly applied to the entire outer surface of the object to be coated. By setting it to 1.0 g / second or less, a coating of appropriate thickness can be obtained without the coating becoming too thick. The coating process is not particularly limited, and various types of coatings and adhesives can be used.

[0022] It is preferable to perform a step of aspirating the organic solvent sprayed from the spray simultaneously with the coating process. Aspirating the organic solvent prevents the worker from being exposed to it. The method of aspiration is not particularly limited; for example, the coating process may be performed in a fume hood, or the generated organic solvent may be aspirated using a local exhaust ventilation system.

[0023] (Method of manufacturing a cylinder or cylindrical object) The above coating method can be used to manufacture a cylinder or cylindrical object whose outer surface is coated with paint. Alternatively, a coating apparatus can be used to manufacture a cylinder or cylindrical object whose outer surface is coated with paint. [Examples]

[0024] The present invention will be described below with reference to examples, but the present invention is not limited to these examples. (Example 1) Using the coating apparatus shown in Figures 1 and 2, adhesive was applied to the outer surface of a cylindrical object to be coated (cylindrical roll, 177 mm in diameter, 1750 mm in length). First, a cylindrical roll was set in the coating device, and the cylindrical roll was rotated at a speed of 64 rpm by a rotation mechanism (a brushless motor with a headgear manufactured by Oriental Motor) around the central axis of the side of the cylindrical roll. At the same time, air was started to be drawn in from the suction port at the bottom of the coating device to prevent the scattering of organic solvents. Next, a spray can (spray adhesive, 3M55 manufactured by 3M) was placed on a transport plate on a guide rail (Sugatsune Kogyo Linear Roller Guide Rail LG30-2000), which is a moving mechanism installed on the outer surface of the side cover parallel to the long axis of the cylindrical roll. The can was positioned at an angle of 45° perpendicular to the central axis of the cylindrical roll, and at a distance of 20 cm from the outer surface of the cylindrical roll. Next, an LED strip light (LED PARADISE Super Flowing RGG Tape

[9490] ), which serves as the flashing light display, was spirally wrapped around a fixing device for the flashing light display unit installed on the outer surface of the upper cover parallel to the long axis of the cylindrical roll. While flashing the light, the adhesive was sprayed from the spray can in time with the movement of the light point, and the spray can was manually moved along the guide rail at a speed of 59 mm / second to apply the adhesive to the outer surface of the cylindrical roll. The amount of adhesive sprayed at this time was approximately 0.68 g / second. Visual inspection of the cylindrical roll's outer surface after application revealed that the adhesive was uniformly applied to the surface. The spray can was moved only in the forward direction along the guide rail, allowing for uniform application of the adhesive to the cylindrical roll's outer surface in a short time without the need for multiple back-and-forth applications. [Industrial applicability]

[0025] The coating method and coating apparatus of the present invention can be used for coating the outer surface of cylindrical or columnar objects made of various materials. [Explanation of Symbols]

[0026] 1. Coating device 2a Cylindrical or cylindrical object to be coated 2b Fixing device for the central axis of the object to be coated 3 Rotation mechanism 4a Flashing light display 4a' LED strip lights 4b Fixing device for the flashing light display unit 5a spray 5b Moving mechanism 5c transport plate 5d opening 10a Top cover 10b Side cover 20 Equipment installation stand 30 Suction port

Claims

1. A rotation step in which a cylindrical or columnar object to be coated is rotated around the central axis of the object to be coated, The process includes a coating step in which a spray nozzle is used to spray paint onto the outer surface of a rotating object to be coated, while moving a spray filled with paint at a constant speed parallel to the central axis of the object to be coated. The spray's movement speed during the coating process is controlled by the movement speed of the light spot. A method for applying coating to a cylindrical or columnar object.

2. The process of aspirating the organic solvent sprayed from the spray nozzle is performed simultaneously with the coating process. The coating method according to claim 1.

3. The spray's movement speed in the coating process is controlled by manually moving the spray in accordance with the movement speed of the light spot. The coating method according to claim 1.

4. The spray's movement speed during the coating process is 10 mm to 100 mm / second. The coating method according to claim 1.

5. The amount of paint sprayed during the coating process is 0.10 to 1.0 g / second. The coating method according to claim 1.

6. The rotational speed of the object to be coated during the rotation process is 10 to 100 rpm. The coating method according to claim 1.

7. The spray angle of the spray nozzle onto the object to be coated is 30 to 60° with respect to the vertical direction of the central axis of the object to be coated. The coating method according to claim 1.

8. A method for manufacturing a cylinder or cylindrical object whose outer surface is coated with paint, comprising the coating method described in any one of claims 1 to 7.

9. A cylindrical or cylindrical object obtained by the manufacturing method of claim 8, wherein the outer surface is coated with paint.

10. A rotating mechanism that fixes a cylindrical or columnar object to be coated and rotates it around its central axis, A moving mechanism for moving the sprayer that sprays the paint, It is equipped with a light-flashing display unit in which the flashing light moves at a constant speed and in a constant direction, The moving mechanism and the light flashing indicator mechanism are installed parallel to the central axis direction of the object to be coated, which is fixed to the rotating mechanism. The moving mechanism has a range of motion that coincides with at least both ends of the long axis of the object to be coated, The light flashing display unit has a length that coincides with at least both ends in the longitudinal direction of the object to be coated. Coating device.

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