Gravure coating equipment

Abstract

To provide a gravure coating device which can prevent deterioration in coating quality without generating coating unevenness on a surface of a thin traveling base material of a continuum shape, when a coating agent is solid-coated onto the base material with even thickness.SOLUTION: A gravure coating device includes a bubble scattering suppression member 30 which combines a coating agent 10 supplied into a coating agent storage container 2 and bubbles 70 of the coating agent generated when the coating agent is supplied, guides and introduces the coating agent 10 and the bubbles 70 to a rear stream side by a gravure roll of a flow derived from the roll of the coating agent generated by rotation of a gravure roll 6 immersed in the coating agent in the coating agent storage container, and prevents the bubbles from being scattered in the coating agent storage container.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a gravure coating apparatus that can apply a coating agent onto a running continuous thin substrate in a uniform thickness using a gravure roll.

Background Art

[0002] A gravure coating apparatus can apply a coating agent onto a running continuous thin substrate in a uniform thickness using a gravure roll. Usually, a running continuous thin substrate adheres the coating agent in a coating agent container to the surface of the gravure roll and applies the coating agent to the lower surface of the continuous thin substrate. The coating agent targets various types such as those containing a fluorine-based release agent component and those containing a magnetic material. Patent Document 1 discloses a gravure coater using a gravure roll.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in a conventional gravure coating apparatus, when trying to apply a coating agent containing a fluorine-based release agent component onto a running continuous thin substrate in a uniform thickness, a large number of hard bubbles are generated in the coating agent due to the fluorine-based release agent component, so the coating agent deteriorates. When this deteriorated coating agent is applied to a running continuous thin substrate, coating streaks occur on the surface of the substrate and coating unevenness occurs, resulting in a significant decrease in coating quality.

[0005] The present invention was made to solve the aforementioned problems, and aims to provide a gravure coating apparatus that can prevent a decrease in coating quality by preventing uneven coating on the surface of a thin, continuous substrate when applying a coating agent to the substrate in a uniform thickness while the substrate is in motion. [Means for solving the problem]

[0006] To solve the aforementioned problems, the gravure coating apparatus of the present invention has a foam scattering suppression member disposed inside a coating agent container that is formed in the shape of a rectangular parallelepiped with an open top and four side portions continuous from the inner bottom, and coating into the coating agent container Agent A gravure coating apparatus that applies a coating agent supplied via a supply nozzle to a thin, continuous substrate in a uniform thickness using a gravure roll and blade, wherein the foam scattering deterrence The component is arranged parallel to the inner bottom of the coating agent container, with space between it and the inner bottom. foam The first to form a passage region foam scattering deterrence The plate and the side surface of the coating agent container are arranged parallel to each other, facing the side surface to which the coating agent supply nozzle is connected, and the coating Agent Space between the side where the supply nozzle is connected foam The second region that forms the passage region foam scattering deterrence The first foam scattering deterrence One end of the plate and the second Foam scattering prevention One end of the board is connected, the first foam scattering deterrence Board and second Foam scattering prevention The plates are arranged perpendicularly to each other, and the first bubble scattering deterrence The other end of the plate opposite to the aforementioned end directs the coating agent and the foam of the coating agent generated when the coating agent is supplied toward the liquid surface downstream of the gravure roll in the roll-derived flow of the coating agent generated by the rotation of the gravure roll immersed in the coating agent in the coating agent container, thereby coating the coating agent container. AgentThe supply nozzle is positioned and arranged to guide along the side surface that is in contact with the side surface and the side surface that is opposite to it.

[0007] According to the gravure coating apparatus of the present invention, The device includes a foam scattering suppression member that combines the coating agent supplied to the coating agent container with the foam generated when the coating agent is supplied, and introduces it to the downstream side of the roll-derived flow of the coating agent generated by the rotation of the gravure roll immersed in the coating agent container, thereby suppressing the scattering of the foam within the coating agent container. Because the foam scattering suppression member is provided, even if a large number of foams are generated, the large number of foams are not diffused into the coating agent in the coating agent container, and pulsation is not generated in the coating agent, so the coating agent does not deteriorate. For this reason, when applying the coating agent to a thin, continuous substrate in a moving state with a uniform thickness, uneven coating is not generated on the surface of the substrate, and a decrease in coating quality can be prevented.

[0009] Furthermore, the foam guided by the foam scattering suppression member is directed downstream of the gravure roll in the flow of the coating agent within the coating agent container. As a result, the foam does not approach the gravure roll, so when applying the coating agent to a thin, continuous substrate in a uniform thickness, uneven coating is not generated on the substrate surface, thus preventing a decrease in coating quality.

[0010] Also, This invention The gravure coating apparatus is characterized in that the foam scattering suppression member has a mounting portion that is attached by hanging it on the upper edge of the side surface of the coating agent container in order to hold it inside the coating agent container.

[0011] The present invention According to the lavia coating apparatus, the foam scattering suppression member can be easily attached to the upper edge of the side surface of the coating agent container using the mounting part. [Effects of the Invention]

[0012] According to the present invention, when applying a coating agent onto a continuously running thin substrate in a uniform thickness, it is possible to provide a gravure coating apparatus that does not cause coating unevenness on the surface of the substrate and can prevent deterioration of coating quality.

Brief Description of the Drawings

[0013] [Figure 1] FIG. 8 is a front view having a cross-section showing an embodiment of the gravure coating apparatus of the present invention. [Figure 2] FIG. 11 is a view showing a gravure coating apparatus commonly used as a comparative example.

Embodiments for Carrying Out the Invention

[0014] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0015] <Overall Configuration of the Gravure Coating Apparatus> FIG. 1 is a front view having a cross-section showing an embodiment of the gravure coating apparatus of the present invention. The gravure coating apparatus 1 shown in FIG. 1 is also called a micro gravure coating apparatus, and uses a gravure roll to apply a coating agent onto a continuously running thin substrate in a uniform thickness. As shown in FIG. 1, the gravure coating apparatus 1 includes a coating agent storage container 2, spreading rolls 3 and 4 for running the substrate 100, a coating agent tank 5, and a gravure roll 6.

[0016] <Coating Agent Storage Container 2> An example of the structure of the coating agent storage container 2 shown in FIG. 1 will be described. The coating agent storage container 2 stores the coating agent 10. The coating agent storage container 2 is preferably connected to a coating agent tank 5 as a coating agent supply section via a pipe 7. The coating agent storage container 2 has a coating agent supply nozzle 8, and this coating agent supply nozzle 8 is connected to one end of the pipe 7. The other end of the pipe 7 is connected to the coating agent tank 5. Thereby, the coating agent 10 is supplied into the coating agent storage container 2 from the coating agent tank 5 through the pipe 7 and the coating agent supply nozzle 8. The coating agent supply nozzle 8 preferably has an opening / closing valve (not shown), and if the opening / closing valve is opened according to a command from the control section 50, the coating agent 10 can be supplied from the coating agent tank 5 to the coating agent storage container 2.

[0017] The coating agent storage container 2 is formed in a rectangular parallelepiped shape with an open top having an inner bottom 11 and four side faces 12 continuously formed from the inner bottom 11, and can store a large amount of the coating agent 10.

[0018] <Gravure roll 6> The gravure roll 6 shown in FIG. 1 is rotatably supported about a central axis 6C using bearings not shown. The gravure roll 6 continuously rotates along a rotation direction R when the control section 50 drives a motor M. In the example of FIG. 1, this rotation direction R is clockwise. The gravure roll 6 is disposed at an intermediate position between the spreading rolls 3 and 4. When the gravure roll 6 continuously rotates, the coating agent 10 in the coating agent storage container 2 adheres to and is stored in the gravure pattern formed by the engraved portion on the outer peripheral surface 6B of the gravure roll 6. The diameter of the gravure roll 6 is formed to be a small diameter of, for example, about 20 mm to 50 mm. When the gravure roll 6 rotates, a roll-derived flow of the coating agent 10 in which the coating agent 10 flows in the same direction (arrow P4) along the rotation direction R is generated due to the rotation.

[0019] <Spreading rolls 3, 4> The tensioning rolls 3 and 4 rotate synchronously in the rotational direction R1 when the control unit 50 drives the motor M1, causing the thin, continuous substrate 100 to travel in the R2 direction. Because the rotational direction R of the gravure roll 6 and the direction R2 in which the substrate 100 travels are opposite, the gravure roll 6 can uniformly apply the coating agent 10 to the lower surface 101 of the substrate 100. The substrate 100 is wound on an unwinding roll (not shown), and the substrate 100 that has been driven by the tensioning rolls 3 and 4 is finally wound onto a take-up roll (not shown).

[0020] <Doctor Blade 20> The doctor blade 20 is positioned downstream of the gravure roll 6 with respect to the R2 direction in which the substrate 100 is fed. The tip 21 of the doctor blade 20 extends to a width that exceeds the entire width in the axial direction of the gravure pattern formed over a predetermined axial length of the gravure roll 6 on both sides. The doctor blade 20 has the function of measuring and filling the gravure pattern of the gravure roll 6 with an appropriate amount of coating agent 10 over its entire width, and also wiping off the coating agent 10 from the outer parts from both ends of the gravure pattern. As a result, the appropriate amount of coating agent 10 filled in the gravure pattern is supplied to the lower surface 101 side of the substrate 100, where the upper surface is free, and applied.

[0021] <Bubble scattering prevention member 30> Next, we will explain the foam scattering suppression member 30 shown in Figure 1.

[0022] The foam scattering suppression member 30 is located inside the coating agent container 2. The foam scattering suppression member 30 is a plate member made of metal such as stainless steel or resin, and is positioned so as to face the inner surface 12D of the side portion 12 and the inner surface 11D of the bottom portion 11. The foam scattering suppression member 30 has the function of suppressing the scattering of numerous bubbles 70 in the coating agent container 2 by guiding the numerous bubbles 70 in the coating agent 10 that are generated when the coating agent 10 is supplied from the coating agent tank 5 to the coating agent container 2 together with the coating agent 10. In other words, the foam scattering suppression member 30 is formed to suppress the scattering of bubbles 70 into the coating agent container 2 by introducing the coating agent 10 and bubbles 70 together and guiding them downstream of the gravure roll 6 in the roll-derived flow of the coating agent 10 generated by the rotation of the gravure roll 6 which is immersed in the coating agent 10 inside the coating agent container 2.

[0023] This foam scattering suppression member 30 is a pulsation prevention plate that prevents pulsation from occurring in the coating agent 10 in the coating agent container 2 by preventing a large number of bubbles 70 from diffusing into the coating agent 10. For this reason, the foam scattering suppression member 30 is also called a pulsation prevention plate. Furthermore, the foam scattering suppression member 30 is also a baffle plate that prevents a large number of bubbles 70 from scattering disorderly in the coating agent 10 in the coating agent container 2.

[0024] To further explain, as shown in Figure 1, the foam scattering suppression member 30 includes a first foam scattering suppression plate 31, a second foam scattering suppression plate 32, and a mounting portion 33. The first foam scattering suppression plate 31 is positioned parallel to and at a distance from the inner surface 11D of the inner bottom portion 11 of the coating agent container 2, and a foam passage region 81 is formed between it and the inner surface 11D. The second foam scattering suppression plate 32 is positioned parallel to and at a distance from the inner surface 12D of the side portion 12 of the coating agent container 2, and a foam passage region 82 is formed between it and the inner surface 12D. One end 31A of the first foam scattering suppression plate 31 (the right end in Figure 1) and one end 32A of the second foam scattering suppression plate 32 (the lower end in Figure 1) are continuous and preferably perpendicular to each other. A bubble passage opening region 80 is formed between the other end 31B (the left end in Figure 1) of the first bubble scattering suppression plate 31 and the inner surface 12F of the side portion 12.

[0025] The mounting portion 33 has a substantially U-shaped cross-section, and one end 33A of the U-shape (the left end in Figure 1) is formed in continuous with the other end 32B of the second bubble scattering suppression plate 32 (the upper end in Figure 1). The other end 33B of the U-shape of the mounting portion 33 is exposed to the outside of the coating agent container 2. The mounting portion 33 is attached to the upper edge 19 of the side surface 12 of the coating agent container 2, and holds the bubble scattering suppression member 30 inside the coating agent container 2. The coating agent supply nozzle 8 is positioned near the upper edge 19 and faces the upper part of the other end 32B of the second bubble scattering suppression plate 32.

[0026] (Example of operation) Next, we will explain an example of the operation of the gravure coating apparatus 1 described above.

[0027] As shown in Figure 1, the coating agent 10 is contained in the coating agent container 2 up to a predetermined liquid level. The stretching rolls 3 and 4 rotate synchronously in the rotational direction R1 when the control unit 50 drives the motor M1, causing the continuous thin substrate 100 to move in the direction R2. The gravure roll 6 rotates continuously along the rotational direction R when the control unit 50 drives the motor M. As a result, on the outer surface 6B of the gravure roll 6 of the gravure coating apparatus 1, the attached coating agent 10 is measured by the doctor blade 20 and the appropriate amount of coating agent 10 is filled into the gravure pattern, and then the coating agent 10 is applied to the lower surface 101 of the moving continuous thin substrate 100 with a uniform thickness.

[0028] As shown in Figure 1, when the coating agent 10 is supplied from the coating agent tank 5 to the coating agent container 2 through the piping 7 and the coating agent supply nozzle 8, the coating agent 10 generates a large number of hard bubbles 70, for example, fluorine-based release agent components, near the coating agent supply nozzle 8. If a large number of bubbles 70 are generated and diffused into the coating agent 10 in the coating agent container 2, it will cause pulsation in the coating agent 10, causing the coating agent 10 to deteriorate. When this deteriorated coating agent 10 is applied to a thin, continuous substrate 100 that is in motion, coating streaks will appear on the underside 101 of the substrate 100, resulting in uneven coating and a significant decrease in coating quality.

[0029] Therefore, in the embodiment of the present invention, a foam scattering suppression member 30 is provided to resolve these inconveniences. This foam scattering suppression member 30 prevents the numerous bubbles 70 that are generated from diffusing into the coating agent 10, thereby preventing pulsation from occurring in the coating agent 10. That is, the numerous bubbles 70 supplied together with the coating agent 10 from the coating agent supply nozzle 8 into the coating agent container 2 are guided together with the coating agent 10 in order along arrows P1, P2, and P3, through only the foam passage region 82, foam passage region 81, and foam passage opening region 80, which are formed by partitioning the coating agent container 2 by the foam scattering suppression member 30, and reach the downstream side of the roll-derived flow of the coating agent 10 (see arrow P4) in the portion of the coating agent container 2 where the gravure roll 6 is immersed. In the vicinity of the gravure roll 6 inside the coating agent container 2, the rotation of the gravure roll 6 in the rotational direction R generates a roll-derived flow in the direction of arrow P4 near the upper surface of the coating agent 10. This roll-derived flow in the direction of arrow P4 prevents the foam 70 inside the coating agent container 2 from approaching the gravure roll 6, so the foam 70 that reaches inside the coating agent container 2 does not approach the gravure roll 6.

[0030] As a result, even if a large number of bubbles 70 are generated, the bubbles 70 are not diffused into the coating agent 10 in the coating agent container 2, and pulsation does not occur in the coating agent 10, so the coating agent 10 does not deteriorate. When this non-deteriorated coating agent 10 is applied to a thin, continuous substrate 100 that is in motion, no coating streaks are generated on the lower surface 101 of the substrate 100, and no uneven coating occurs, thus preventing a decrease in coating quality.

[0031] (Comparative example) Next, in order to compare the coating agent container 2 in the embodiment of the present invention shown in Figure 1 with a commonly used coating agent container, a conventional gravure coating apparatus 200 commonly used is shown in Figure 2 as a comparative example. Note that the same reference numerals are used for the same components of the gravure coating apparatus 200 of the comparative example shown in Figure 2 as for the gravure coating apparatus 1 of the embodiment of the present invention shown in Figure 1, and their descriptions are omitted.

[0032] As shown in Figure 2, in a coating agent container 202 used in a typical gravure coating apparatus 200, the member 210 is positioned near the coating agent supply nozzle 8. Since this member 210 only extends to the vicinity of the upper edge 19 of the coating agent container 2, the foam 70 supplied together with the coating agent 10 remains near the upper surface of the coating agent 10 due to its buoyancy, and also passes near the gravure roll 6, carried by the roll-derived flow in the direction of arrow P4 generated by the rotation of the gravure roll 6, which is rotating in the rotational direction R, from the vicinity of the coating agent supply nozzle 8.

[0033] Therefore, if a large number of bubbles 70 are generated and diffused into the coating agent 10 in the coating agent container 2, it will cause pulsation in the coating agent 10, causing the coating agent 10 to deteriorate. When this deteriorated coating agent 10 is applied to a thin, continuous substrate 100 that is in motion, coating streaks will appear on the lower surface 101 of the substrate 100, resulting in uneven coating and a significant decrease in coating quality.

[0034] As described above, in the embodiment of the present invention, the gravure coating apparatus 1 can apply a coating agent 10 to a thin, continuous substrate 100 in a uniform thickness using a gravure roll 6. The gravure coating apparatus 1 has a bottom portion 11, a side portion 12 continuous with the bottom portion 11, and a coating agent tank 5 as a supply portion for supplying the coating agent 10. It also has a coating agent container 2 for storing the coating agent 10 supplied from the supply portion, adhering the coating agent 10 to the gravure roll 6, and applying it to the lower surface 101 of the substrate 10, and a foam scattering suppression member 30 disposed inside the coating agent container 2, which guides the foam 70 of the coating agent generated when the coating agent 10 is supplied from the supply portion to the coating agent container 2, from the supply portion to the inner surface 12D of the side portion 12 and the inner surface 11D of the bottom portion 11, together with the coating agent 10, thereby suppressing the foam 70 from scattering inside the coating agent container 2.

[0035] As a result, even if a large number of bubbles 70 are generated, the bubbles 70 are not diffused into the coating agent 10 in the coating agent container 2, and pulsation does not occur in the coating agent 10, so the coating agent 10 does not deteriorate. Therefore, when applying the coating agent 10 to a thin, continuous substrate 100 in a uniform thickness, uneven coating does not occur on the surface of the substrate 100, and a decrease in coating quality can be prevented.

[0036] The foam scattering suppression member 30 has an attachment portion 33 that is attached by hooking it onto the upper edge 19 of the side portion 12 of the coating agent container 2 in order to hold it inside the coating agent container 2. As a result, the foam scattering suppression member 30 can be easily attached to the upper edge 19 of the side portion 12 of the coating agent container 2 by using the attachment portion 33.

[0037] The system includes a doctor blade 20 that ensures a uniform thickness of the coating agent 10 on the surface of the substrate 100 when applying the coating agent evenly from the surface of the gravure roll 6 to the surface of the substrate 100. The foam 70 guided by the foam scattering suppression member 30 is guided to the side where the doctor blade 20 is located within the coating agent container 2. As a result, the foam 70 does not approach the gravure roll 6 side, so when applying the coating agent 10 to the thin, continuous substrate 100 in a uniform thickness, coating unevenness does not occur on the surface of the substrate 100, thus preventing a decrease in coating quality.

[0038] The present invention is not limited to the above embodiments, and various modifications can be made as needed. For example, the shape of the foam scattering suppression member 30 of the gravure coating apparatus 1 shown in Figure 1 is not limited to the illustrated example, and can be arbitrarily changed to match the shape of the coating agent container 2. [Explanation of Symbols]

[0039] 1. Gravure coating apparatus 2. Coating agent container 3, 4 Stretching Rolls 5. Coating agent tank (coating agent supply unit) 6 Gravure Roll 7 Piping 8. Coating agent supply nozzle 10 Coating agents 11 Inner bottom 12 Side part 20. Doctor Blade (Example of a blade) 30 Bubble scattering prevention material 31 1st bubble scattering prevention plate 32 2nd bubble scattering prevention plate 33 Mounting part 50 Control Unit 70 bubbles 80 Bubble passage opening area 81 Bubble passage area 82 Bubble passage area 100 Base material M, M1 motor

Claims

1. A gravure coating apparatus is provided in which a foam scattering suppression member is disposed inside a coating agent container formed in the shape of a rectangular parallelepiped with an open top having four side surfaces that are continuous from the inner bottom, and a coating agent supplied to the coating agent container via a coating agent supply nozzle is applied to a thin, continuous substrate in a uniform thickness using a gravure roll and blade, The foam scattering suppression member is, The container comprises a first foam scattering suppression plate, which is disposed parallel to and opposite the inner bottom of the coating agent container and forms a foam passage region in the space between it and the inner bottom, and a second foam scattering suppression plate, which is disposed parallel to and opposite the side surface of the coating agent container to which the coating agent supply nozzle is connected and forms a foam passage region in the space between it and the side surface to which the coating agent supply nozzle is connected. One end of the first bubble scattering suppression plate and one end of the second bubble scattering suppression plate are connected, and the first bubble scattering suppression plate and the second bubble scattering suppression plate are arranged perpendicularly to each other. A gravure coating apparatus characterized in that the other end of the first foam scattering suppression plate, opposite to the one end, is positioned to guide the coating agent and the foam of the coating agent generated when the coating agent is supplied, toward the liquid surface downstream of the gravure roll in the roll-derived flow of the coating agent generated by the rotation of the gravure roll immersed in the coating agent in the coating agent container, along the side facing the side of the coating agent container to which the coating agent supply nozzle is in contact.

2. The gravure coating apparatus according to claim 1, characterized in that the foam scattering suppression member has a mounting portion that is attached by hanging it over the upper edge of the side surface of the coating agent container in order to be held inside the coating agent container.

Images