JP2023079095A - Gravure coating device - Google Patents

Abstract

To provide a gravure coating device which facilitates replacement of a coating agent when the coating agent is replaced with a new coating agent, and can prevent deterioration in coating quality when the coating agent is solid-coated onto a thin traveling base material of a continuum shape with even thickness.SOLUTION: A gravure coating device 1 solid-coats a coating agent 10 with an even thickness onto a thin traveling base material 100 of a continuum shape using a gravure roll 6. The gravure coating device 1 has a coating agent storage container 2 which stores the coating agent 10, attaches the coating agent 10 onto an outer peripheral surface 6B of the gravure roll 6, and thereby solid-coats the coating agent 10 onto the surface of the base material 100, an inner bottom part 11 of the coating agent storage container 2 is bottomed-up to a side of the outer peripheral surface 6b of the gravure roll 6, and the coating agent storage container 2 is made of metal and is grounded.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a gravure coating apparatus capable of uniformly applying a coating agent with a uniform thickness to a running thin continuous substrate using a gravure roll.

The gravure coating apparatus can apply a coating agent with a uniform thickness to a running continuous thin substrate using a gravure roll. Normally, a large coating agent container with a large storage depth stores the coating agent, and the running base material adheres the coating agent in the coating agent container to the surface of the gravure roll. A coating agent is applied to the lower surface of the substrate.

A commonly used large coating agent container is made of a resin material (e.g., nylon AL: aluminum vapor-deposited on nylon) with a fluorine coating on the surface, and the shape of the coating agent container is an open top. is a rectangular parallelepiped. In order to accommodate a large amount of coating agent, the distance between the surface of the gravure roll and the inner bottom surface of the coating agent container is large. Patent document 1 discloses a gravure coating machine using a gravure roll.

JP 2001-104852 A

When the conventional large-sized coating agent container described above is used, a large amount of coating agent is contained, so when it is attempted to replace the coating agent with a new coating agent, it is not easy to replace the coating agent. , is not convenient. In addition, the inner surface of the corner portion of the inner bottom of the large-sized coating agent container is square, and the coating agent tends to stay in this corner portion. There is a danger that old coating material will remain in the corners of the inner bottom of the container. For this reason, there is a possibility that the coating quality may be degraded when the coating agent is uniformly applied to a running continuous thin substrate with a uniform thickness.
The present invention has been made in order to solve the above-mentioned problems, and it is easy to replace the coating agent when replacing the coating agent with a new coating agent, and it is possible to replace the running continuous body. To provide a gravure coating apparatus capable of preventing the deterioration of coating quality when coating a thin base material with a coating agent in a uniform thickness.

In order to solve the above problems, the gravure coating apparatus of claim 1 uses a gravure roll to apply a coating agent to a running continuous thin base material with a uniform thickness. The gravure coating apparatus includes a coating agent storage container for storing the coating agent and applying the coating agent to the outer peripheral surface of the gravure roll to apply a solid coat to the surface of the base material. The inner bottom of the coating agent storage container is raised to the outer peripheral surface side of the gravure roll, and the coating agent storage container is made of metal and grounded.

In the gravure coating apparatus of claim 1, the inner bottom of the coating agent storage container is raised toward the outer peripheral surface of the gravure roll, so that the amount of coating agent that can be accommodated can be reduced. It is easy to replace the coating agent when replacing it with a new coating agent. Therefore, when the coating agent is applied to the substrate, the liquid circulation efficiency of the coating agent in the coating agent storage container can be increased.
Moreover, since the coating agent storage container is made of metal and is grounded, it is possible to eliminate the charging of the coating agent and the substrate, which is the film, and have an antistatic effect. Therefore, when the coating material is uniformly applied to the running thin continuous base material, the coating material is applied evenly to the running thin continuous base material. It is possible to prevent the coating quality from deteriorating when solidly coating with an appropriate thickness.

In the gravure coating apparatus according to claim 2, the coating agent container has the inner bottom portion and a side surface portion formed continuously from the inner bottom portion, and the inner surface of the inner bottom portion and the side surface are formed continuously from the inner bottom portion. The angle formed by the inner surface of the portion is an obtuse angle.

In the gravure coating apparatus of claim 2, since the angle formed by the inner surface of the inner bottom and the inner surface of the side surface is an obtuse angle, even if the coating agent is replaced, the previous coating agent remains at an obtuse angle. It is difficult to remain in the corners where it is. As a result, it is possible to prevent the previous coating agent from mixing with the subsequent coating agent, which further reduces the coating quality when the coating agent is uniformly applied to the substrate with a uniform thickness. can be prevented.

A gravure coating apparatus according to claim 3 is characterized in that the coating agent container is made of stainless steel.
In the gravure coating apparatus of claim 3, since the coating agent storage container is made of stainless steel, it is excellent in conductivity and durability and can be used for a long period of time.

According to the present invention, it is easy to replace the coating agent when replacing the coating agent with a new coating agent, and the coating agent is applied uniformly to the running thin continuous substrate. It is possible to provide a gravure coating apparatus capable of preventing deterioration of coating quality when solidly coating with a sufficient thickness.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which has a cross section which shows embodiment of the gravure coating apparatus of this invention. As a comparative example, it is a figure which shows the coating apparatus normally used.

Preferred embodiments of the invention are described in detail below with reference to the drawings.
<Overall configuration of gravure coating device>
FIG. 1 is a front view with 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 to a running thin continuous substrate in a uniform thickness. do. As shown in FIG. 1 , the gravure coating apparatus 1 has a coating agent storage container 2 , spreading rolls 3 and 4 for running a substrate 100 , a coating agent tank 5 , and a gravure roll 6 .

<Coating agent container 2>
A structural example 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 via a pipe 7 to a coating agent tank 5 as a coating agent supply unit. The coating agent container 2 has a coating agent supply nozzle 8 which 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 can be supplied from the coating agent tank 5 into the coating agent container 2 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). When the opening/closing valve is opened by a command from the control unit 50, the coating agent is applied from the coating agent tank 5 to the coating agent storage container 2. Agent 10 can be supplied.

As shown in FIG. 1 , the coating agent storage container 2 is mounted on a base 16 . The coating agent storage container 2 has an inner bottom portion 11 and four side portions 12 formed continuously from the inner bottom portion 11 . The angle θ between the inner surface 13 of each side surface portion 12 and the corner portion 10C formed by the inner surface 14 of the inner bottom portion 11 is an obtuse angle exceeding 90 degrees. The coating agent storage container 2 is preferably made of a highly conductive metal such as stainless steel (SUS) and has an earth ground 15 . The inner bottom portion 11 of the coating agent storage container 2 is raised toward the outer peripheral surface 6B of the gravure roll 6 compared to the inner bottom portion of the conventional container. The amount of the coating agent 10 that can be accommodated in the coating agent storage container 2 is, for example, about 1/3 of the amount of coating agent that can be accommodated in a conventionally used coating agent container. We are trying to make it smaller.

<Gravure roll 6>
The gravure roll 6 shown in FIG. 1 is rotatably supported around a central axis 6C using bearings (not shown). The gravure roll 6 is continuously rotated along the rotation direction R by driving the motor M by the control unit 50 . This rotation direction R is clockwise in the example of FIG. A gravure roll 6 is arranged at an intermediate position between the spreading rolls 3 and 4 . As the gravure roll 6 rotates continuously in the rotation direction R, the coating agent 10 in the coating agent storage container 2 adheres to the outer peripheral surface 6B of the gravure roll 6 with a uniform thickness. The diameter of the gravure roll 6 is, for example, about 20 mm to 50 mm, and the outer peripheral surface 6B of the gravure roll 6 is made of, for example, a ceramic material.

<Spreading rolls 3 and 4>
The control unit 50 drives the motor M1 to rotate the spreading rolls 3 and 4 synchronously in the rotation direction R1, thereby causing the continuous thin base material 100 to run. Since the rotation direction R of the gravure roll 6 and the direction R2 in which the substrate 100 travels are opposite to each other, the gravure roll 6 evenly coats the coating agent 10 on the lower surface 101 side of the substrate 100. can be done. The base material 100 is wound around a winding roll (not shown), and the base material 100 traveled by the spreading rolls 3 and 4 is finally wound around a winding roll (not shown).

<Doctor Blade 20>
The doctor blade 20 is arranged downstream of the gravure roll 6 with respect to the R2 direction in which the substrate 100 travels. A tip portion 21 of the doctor blade 20 is provided over the entire width within the gravure pattern of the gravure roll 6 . The doctor blade 20 fills the entire width of the gravure pattern of the gravure roll 6 with an appropriate amount of the coating agent 10 on the lower surface 101 side of the base material 100, and removes the coating agent 10 from both ends of the gravure pattern to the outside. It has a function that can be wiped off.

(Operation example)
Next, an operation example of the gravure coating apparatus 1 described above will be described.
As shown in FIG. 1, the coating agent 10 is stored in the coating agent storage container 2 up to a predetermined liquid level. The control unit 50 drives the motor M1 to rotate the spreader rolls 3 and 4 synchronously in the rotation direction R1, thereby causing the continuous thin substrate 100 to run in the direction R2. The gravure roll 6 is continuously rotated along the rotation direction R by driving the motor M by the control unit 50 . As a result, the coating agent 10 in the coating agent storage container 2 is adhered to the outer peripheral surface 6B of the gravure roll 6 of the gravure coating device 1, and the running continuous body is accurately weighed by the doctor blade 20. The coating agent 10 can be uniformly applied to the lower surface 101 of the thin substrate 100 with a uniform thickness.

By the way, as described above, when coating the coating agent 10 with a uniform thickness on the lower surface 101 of the substrate 100, for example, toluene in the coating agent 10 or the polyimide of the substrate 100, which is a film, Electrostatic charge is generated. However, the coating agent storage container 2 is made of a highly conductive metal such as stainless steel (SUS) and has an earth ground 15 . For this reason, it is possible to eliminate charging of toluene in the coating agent 10 and polyimide of the base material 100, which is a film, and have an antistatic effect. As a result, the coating agent storage container 2 can apply the coating agent 10 to the lower surface 101 of the running continuous thin substrate 100 with a more stable and uniform thickness. Moreover, since the coating agent storage container 2 is made of stainless steel, it is excellent in conductivity and durability and can be used for a long period of time.

Further, as described above, the inner bottom portion 11 of the coating agent container 2 is raised toward the surface of the gravure roll compared to the inner bottom portion of the conventional container. The amount of the coating agent 10 that can be accommodated in the coating agent storage container 2 is, for example, about 1/3 of the amount of coating agent that can be accommodated in a conventionally used container. That is, the amount of the coating agent 10 that can be accommodated in the coating agent container 2 is greatly reduced. As a result, the liquid circulation efficiency of the coating agent 10 in the coating agent storage container 2 can be increased in the operation of applying the coating agent 10 to the lower surface 101 of the base material 100 . Further, when it is desired to change the type of the coating agent 10 in the coating agent storage container 2 and store another type of coating agent 10 in the coating agent storage container 2, the coating agent 10 can be easily replaced. can be

Moreover, the angle θ between the inner surface 13 of each side surface portion 12 and the corner portion 10C formed by the inner surface 14 of the inner bottom portion 11 is an obtuse angle. As a result, even if the coating agent 10 is replaced, the previous coating agent 10 is less likely to remain in the corner portion 10C. Therefore, since it is possible to prevent the former coating agent 10 and the latter coating agent 10 from being mixed, when the coating agent 10 is uniformly applied to the substrate 100 with a uniform thickness, the coating It is possible to further prevent deterioration of quality.

(Comparative example)
Next, in order to compare the coating agent storage container 2 in the embodiment of the present invention shown in FIG. 200 is shown in FIG. Components of the gravure coating apparatus 200 of the comparative example shown in FIG. 2 are the same as those of the gravure coating apparatus 1 of the embodiment of the present invention shown in FIG. omitted.

As shown in FIG. 2, a coating agent container 202 used in a commonly used gravure coating device 200 is a large-sized container, and the surface of a resin material (for example, nylon AL: nylon on which aluminum is vapor-deposited) is coated. Fluorine coated. The shape of the large coating agent container 202 is a rectangular parallelepiped with an open top. interval is large.

For this reason, if a large coating agent container 202 is used, a large amount of coating agent 10 is stored, so when replacing the coating agent 10 with a new coating agent 10, the coating agent 10 cannot be replaced. is not easy and is not user-friendly. In addition, the coating agent 10 tends to stay in the corner portions 220 of the inner bottom portion 210 of the large-sized coating agent container 202, and even if the coating agent 10 is replaced with a new one, the old coating agent 10 remains in the corner portions 220. may be left behind. For this reason, when the coating agent 10 is uniformly applied to the running continuous thin substrate 100 with a uniform thickness, the coating quality may be degraded.

As described above, the gravure coating apparatus 1 of the embodiment of the present invention uses the gravure roll 6 to apply a coating agent with a uniform thickness to the running thin continuous base material 100 . It is a solid coating device. This gravure coating apparatus 1 accommodates a coating agent 10 and adheres the coating agent 10 to an outer peripheral surface 6B of a gravure roll 6 to coat the lower surface 101 of a substrate 100 in a solid manner. It has a container 2 . The inner bottom portion 11 of the coating agent storage container 2 is raised toward the outer peripheral surface 6B of the gravure roll 6, and the coating agent storage container 2 is made of metal and is grounded 15 to the ground.

As a result, since the inner bottom portion 11 of the coating agent storage container 2 is raised toward the outer peripheral surface 6B of the gravure roll 6, the amount of the coating agent 10 that can be accommodated can be reduced. Therefore, when applying the coating agent 10 to the substrate 100, the liquid circulation efficiency of the coating agent 10 in the coating agent storage container 2 can be increased. It is easy to replace the coating agent 10 when replacing the coating agent 10 with a new coating agent 10 .

Moreover, since the coating agent storage container 2 is made of metal and is grounded, it is possible to eliminate charging of toluene in the coating agent 10 and polyimide of the base material 100, which is a film. and has an antistatic effect. Therefore, when the coating agent 10 is uniformly applied to the running continuous thin substrate 100 with a uniform thickness, it is possible to prevent the coating quality from deteriorating.

Further, the coating agent storage container 2 has an inner bottom portion 11 and a side portion 12 formed continuously from the inner bottom portion 11, and an inner surface 14 of the inner bottom portion 11 and an inner surface 13 of the side portion 12 form. The angle θ is an obtuse angle. As a result, even if the coating agent 10 is replaced, the previous coating agent 10 is less likely to remain in the obtuse-angled corner portion 10C. Therefore, since it is possible to prevent the former coating agent 10 and the latter coating agent 10 from being mixed, when the coating agent 10 is uniformly applied to the substrate 100 with a uniform thickness, the coating It is possible to further prevent deterioration of quality.
Since the coating agent storage container 2 is made of stainless steel, it has excellent conductivity and durability, and can be used for a long period of time.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the claims.
For example, the shape of the coating agent storage container 2 is not limited to the example shown in FIG. It is sufficient if the corner portion 10C is formed at an angle exceeding a right angle.

1 Gravure coating device 2 Coating agent storage container 3, 4 Spreading roll 5 Coating agent tank (supply part of coating agent)
6 gravure roll 6B outer peripheral surface 7 pipe 8 coating agent supply nozzle 10 coating agent 10C corner portion 11 inner bottom portion 12 side portion 20 doctor blade 50 controller 100 substrate 101 substrate lower surface M, M1 motor

Claims (3)

A gravure coating apparatus that uses a gravure roll to uniformly apply a coating agent to a running continuous thin base material with a uniform thickness,
a coating agent storage container for storing the coating agent and attaching the coating agent to the outer peripheral surface of the gravure roll to apply a solid coat to the surface of the base material;
The inner bottom portion of the coating agent container is raised to the outer peripheral surface side of the gravure roll,
A gravure coating apparatus, wherein the coating agent container is made of metal and grounded. The coating agent storage container has the inner bottom portion and a side surface portion formed continuously from the inner bottom portion, and the angle formed by the inner surface of the inner bottom portion and the inner surface of the side surface portion is 2. The gravure coating apparatus according to claim 1, wherein the angle is obtuse. 3. A gravure coating apparatus according to claim 1, wherein said coating agent container is made of stainless steel.

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