JP2021126608A - Application device - Google Patents

Abstract

To provide an application device capable of uniformizing a film thickness of coating liquid throughout in a width direction or capable of improving ununiformity of the film thickness.SOLUTION: A application device for applying a coating liquid in a prescribed width in a width direction orthogonal to a carrying direction on a surface of a long-sized sheet being continuously carried, includes: a slit die; a backup roll; a roll temperature measurement unitt for measuring a surface temperature of the backup roll across the width direction; and a roll temperature profile changing unit for changing a temperature profile in the width direction of the backup roll. The roll temperature profile changing unit includes at least one of a roll heating unit for heating the backup roll and a roll cooling unit for cooling the backup roll, and includes a control unit for controlling the roll temperature profile changing unit based on a measurement result measured by the temperature measurement unit.SELECTED DRAWING: Figure 1

Description

The present invention relates to a coating device that applies a coating liquid to the surface of a long sheet that is continuously conveyed.

The electrode plate of the battery material is manufactured by applying and drying an active material or a carbon material (that is, a coating liquid) on the surface of a conductive base material such as aluminum foil or copper foil.

The coating device in this manufacturing process continuously conveys a long sheet in a roll-to-roll manner, and discharges a coating liquid to the surface of the long sheet from a slit nozzle (that is, a coating die) with a predetermined width. The thickness and coating width of the coating liquid are adjusted by adjusting the gap between the long sheet and the coating die and the supply amount of the coating liquid (for example, Patent Document 1). The coating form includes not only single-row coating in which the base material is applied in a wide width direction, but also double-row coating in which the center is not coated, striped multi-row coating, and the like.

Further, in order to extend the slack of the long sheet to be continuously conveyed, a technique called a crown roll, in which the long sheet is conveyed by using a guide roll having a diameter larger at the center than both ends (for example) is known. , Patent Document 2).

JP-A-2007-258878 Japanese Unexamined Patent Publication No. 2005-169305

Focusing on the width direction of the long sheet to which the coating liquid is applied, the uniformity of the thickness (that is, the film thickness) of the coating liquid is required. However, when the temperature of the long sheet is different from the atmospheric temperature, or when there is a local temperature change in the device, the diameter of the backup roll becomes uneven due to the influence of the temperature change, and the coating gap (and thus the film thickness) becomes uneven. ) Is likely to be non-uniform.

On the other hand, even in a scene that is not affected by temperature changes, the coating gap (and thus the film thickness of the coating liquid) due to the processing accuracy of the backup roll and slit die, sagging after assembly, deformation, etc. becomes non-uniform. Sometimes.

Even if the crown roll described in Patent Document 2 is used, the coating gap and the film thickness are not good due to the time-dependent change of the coating gap and the film thickness due to the influence of the temperature change, the deformation of the backup roll and the slit die, and the like. It is difficult to improve uniformity.

Therefore, the present invention has been made in view of the above problems.
It is an object of the present invention to provide a coating apparatus capable of making the film thickness of a coating liquid uniform over the width direction or improving the non-uniformity of the film thickness.

In order to solve the above problems, one aspect of the present invention is
A coating device that applies a coating liquid to the surface of a long sheet that is continuously transported with a predetermined width in the width direction orthogonal to the transport direction, and a slit die that discharges the coating liquid toward the long sheet.
While supporting the long sheet in the width direction from the surface opposite to the surface to which the coating liquid is applied so that the surface of the long sheet and the tip of the slit die are at a predetermined distance, the long sheet is supported. A backup roll that rotates in synchronization with the sheet transfer speed,
A roll temperature measuring unit that measures the surface temperature of the backup roll over the width direction,
It is equipped with a roll temperature profile change section that changes the temperature profile in the width direction of the backup roll.
The roll temperature profile changing unit includes at least one of a roll heating unit that heats the backup roll and a roll cooling unit that cools the backup roll.
It is provided with a control unit that controls a roll temperature profile changing unit based on the measurement result measured by the temperature measuring unit.

According to the above invention, the coating gap can be adjusted by appropriately adjusting the diameter of the backup roll in the width direction.

Even if the backup roll or slit die is deformed over time due to the influence of the temperature change, such as when the temperature of the long sheet is different from the atmospheric temperature or there is a local temperature change in the device, it extends in the width direction. The film thickness of the coating liquid can be made uniform. Alternatively, it is possible to improve the non-uniformity of the film thickness in the width direction even in a scene that is not affected by the temperature change.

It is a side view which shows the main part of the coating line which includes an example of the form which embodies the present invention. It is a perspective view which shows the main part of the example of the form which embodies the present invention. It is a block diagram which shows an example of the form which embodies the present invention. It is a flow figure which shows the operation flow of an example of the form which embodies the present invention. It is the schematic which shows the state during and after coating in an example of the embodiment which embodies the present invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
In the following description, the transport direction of the long sheet W is expressed as the MD direction, and the width direction orthogonal to the transport direction is expressed as the TD direction. Further, for convenience of explanation, the horizontal direction is referred to as the X direction and the Y direction, and the gravity direction is referred to as the Z direction. The long sheet W will be described on the premise that the width direction TD faces the Y direction and the long sheet W is generally conveyed in the X direction or the XZ direction.

FIG. 1 is a side view showing a main part of a coating line L including an example of a form embodying the present invention. In addition to the coating device 1 according to the present invention, FIG. 1 shows an upstream device (for example, a drying device DR1) and a downstream device (for example, a drying device DR2).

FIG. 2 is a perspective view showing a main part of an example of a form embodying the present invention. FIG. 2 shows each part constituting the main part of the coating device 1 according to the present invention.

FIG. 3 is a block diagram showing an example of a form embodying the present invention. FIG. 3 shows each element constituting the coating device 1 according to the present invention and the processing transmission direction as a block diagram.

The coating device 1 applies the coating liquid Q to the surface of the long sheet W that is continuously transported in a predetermined width in the width direction TD orthogonal to the transport direction MD.
Specifically, the coating device 1 includes a slit die 2, a backup roll 3, a roll temperature measuring unit 4, a roll temperature profile changing unit 5, a film thickness measuring unit 6, a control unit 9, a sheet transporting unit M, and a coating liquid supply unit. It is equipped with T and the like.

The sheet conveying unit M continuously conveys the long sheet W in a predetermined direction (conveying direction MD) at a predetermined speed. Specifically, the sheet transport unit M includes transport rolls R1 and R2, take-up rolls R3, and the like.
The transport rolls R1 and R2 transport the long sheet W in the transport direction MD while supporting the long sheet W in a predetermined posture. Specifically, the transport rolls R1 and R2 are in contact with the long sheet W at a predetermined angle in the transport direction MD, and a rotary motor and an encoder are attached as needed. More specifically, the transport rolls R1 and R2 are configured such that these rotary motors and encoders are connected to the control unit 9 and rotate at a predetermined rotational speed.
The take-up roll R3 winds up the long sheet W after coating and drying. Specifically, the rotation speed is controlled so that the speed of the outer peripheral surface of the take-up roll R3 becomes constant.

The slit die 2 discharges the coating liquid Q toward the long sheet W.
Specifically, the slit die 2 includes a supply port 21 for supplying the coating liquid Q, a discharge port 22 for discharging the coating liquid Q, and a manifold 23 for communicating the supply port 21 and the discharge port 22.
More specifically, the slit die 2 is also called a slit nozzle, and when the coating liquid Q is pumped and supplied to the supply port 21, the coating liquid Q is pushed out from the elongated slit-shaped discharge port 22 in the width direction TD. It is discharged.

The coating liquid supply unit T supplies the coating liquid Q to the slit die 2.
Specifically, the coating liquid supply unit T includes a tank for storing the coating liquid Q, a pump for pumping the coating liquid Q, a switching valve, a flow rate adjusting mechanism, and the like, and is connected to the supply port 21 of the slit die 2. There is.

The backup roll 3 is coated with the coating liquid Q on the long sheet W so that the surface of the long sheet W and the tip of the slit die 2 are at a predetermined interval (that is, the coating gaps are the same). While supporting the long sheet W from the surface side opposite to the surface side over the width direction TD, the long sheet W rotates in synchronization with the transport speed.
Specifically, the backup roll 3 has a cylindrical outer shape and is configured to be rotatable with the width direction TD as the rotation axis 3c. Further, the backup roll 3 is attached with a rotary motor 3 m and an encoder 3e, and is in contact with the long sheet W at a predetermined angle in the transport direction MD. The rotary motor 3m and the encoder 3e are connected to the control unit 9, and the rotational speed of the rotary motor 3m is controlled.

The temperature measuring unit 4 measures the surface temperature of the backup roll 3 over the width direction TD. Specifically, the temperature measuring unit 4 detects heat and infrared rays radiated from the surface of the backup roll 3 and outputs an electric signal according to the amount of heat and infrared rays and the intensity of infrared rays, numerical data, and the like. An example is one that outputs. More specifically, the temperature measuring unit 4 absorbs a part of the heat radiated from the surface of the backup roll 3 and changes the electromotive force and the internal resistance according to the temperature (so-called thermopile or bolometer). ), Infrared detection elements (so-called photodiodes) that detect infrared rays radiated from the surface of the backup roll 3 and output an electric signal according to the amount and intensity of the detected infrared rays, etc. are arranged linearly. Can be exemplified. Then, the surface temperature of the backup roll 3 measured by the temperature measuring unit 4 can be grasped by the strength of the electric signal output from the heat detecting element or the infrared detecting element, numerical data, or the like.

The roll temperature profile changing unit 5 changes the temperature profile in the width direction of the backup roll 3. Specifically, the roll temperature profile changing unit 5 includes a roll heating unit 51, a heating position changing unit 53, a roll cooling unit 56, and a cooling position changing unit 58.

The roll heating unit 51 changes the temperature profile of the backup roll 3 in the width direction TD.
Specifically, the roll heating unit 51 includes a plurality of heating means 52 arranged in the width direction TD of the backup roll 3.
The heating means 52 locally heats the backup roll 3.
Specifically, each heating means 52 is composed of an electric heater arranged so as to face the outer peripheral surface of the backup roll 3. More specifically, each electric heater may be a non-contact type or a contact type that transfers heat to the outer peripheral surface of the backup roll 3.

Then, the roll heating unit 51 can adjust the heating temperature by the heating means 52 based on the control command from the control unit 9. Specifically, the roll heating unit 51 controls the voltage, current, and the like applied to each electric heater based on the control command from the control unit 9.

The heating position changing unit 53 changes the position of the TD in the width direction of each heating means 52. Specifically, the heating position changing unit 53 is composed of an actuator that moves the heating means 52 to a predetermined position in the width direction TD and stops the heating means 52 at a predetermined position based on a control command from the control unit 9.

The roll cooling unit 56 changes the temperature profile of the backup roll 3 in the width direction TD.
Specifically, the roll cooling unit 56 includes a plurality of cooling means 57 arranged in the width direction TD of the backup roll 3.
The cooling means 57 locally cools the backup roll 3. Specifically, each cooling means 57 is composed of an air blow nozzle arranged so as to face the outer peripheral surface of the backup roll 3. More specifically, each air blow nozzle is connected to a compressed air supply means, a cold air supply means, or the like via a switching valve, a flow rate adjusting mechanism, or the like.

Then, the roll cooling unit 56 can adjust the cooling temperature by the cooling means 57 based on the control command from the control unit 9. Specifically, each cooling means 57 controls the flow rate of air injected from each air blow nozzle, the air blow range, and the like based on the control command from the control unit 9.

The cooling position changing unit 58 changes the position of each cooling means 57 in the width direction TD. Specifically, the cooling position changing unit 58 is composed of an actuator that moves the cooling means 57 to a predetermined position in the width direction TD and stops it at a predetermined position based on a control command from the control unit 9.

The film thickness measuring unit 6 measures the film thickness of the coating liquid Q applied to the surface of the long sheet W over the width direction TD.
Specifically, the film thickness measuring unit 6 determines the weight per unit area of the applied coating liquid Q (corresponding to the film thickness) based on the transmission amount and transmittance of X-rays, β-rays, and the like. An example is one that outputs an electric signal, numerical data, or the like according to the response.
More specifically, the film thickness measuring unit 6 measures the intensity of the X-rays, β-rays, etc. with the irradiation unit 61, which emits X-rays, β-rays, etc. over the width direction TD of the long sheet W. It is provided with a unit 62. The irradiation unit 61 and the measurement unit 62 of the film thickness measuring unit 6 are arranged to face each other at predetermined intervals so as to sandwich the long sheet W, and are arranged on the upstream side of the drying device DR2 (for example, the slit die 2 and the drying unit 62). It is installed on the downstream side of the drying device DR2 (for example, between the drying device DR2 and the transport roll R2).

The control unit 9 rolls based on the measurement result of the temperature profile of the backup roll 3 measured by the temperature measurement unit 4 and the measurement result of the film thickness distribution of the coating liquid Q in the width direction TD measured by the film thickness measurement unit 6. It controls the temperature profile changing unit 5.
Specifically, the control unit 9 mainly has the following functions.
-Control of the sheet transport unit M for continuously transporting a long sheet (specifically, control of the rotation speed of a rotary motor or the like such as transport rolls R1 and R2 and take-up roll R3).
-Control of discharge ON / OFF and discharge amount of the coating liquid Q supplied from the coating liquid supply unit T to the slit die 2-Rotation control of the backup roll 3 (specifically, rotation speed control of the rotary motor 3 m)
-Input / acquisition of electrical signals, numerical data, etc. output from the roll temperature measuring unit 4
-Control of the roll temperature profile changing unit 5 (specifically, the heating means 51 and the cooling means 56 are controlled).
-Control of the heating position changing unit 53 and the cooling position changing unit 58-Input / acquisition of electrical signals, numerical data, etc. output from the film thickness measuring unit 6

Specifically, the control unit CN is composed of a computer, a programmable logic controller, etc. (that is, hardware) and an execution program thereof (that is, software).

(Control flow of coating film thickness)
FIG. 4 is a flow chart showing an operation flow of an example of a mode embodying the present invention.
FIG. 4 shows a flow for controlling the equipment of each part by the control unit CN to make the coating film thickness in the width direction TD uniform.

First, the sheet transport unit M is driven to continuously transport the long sheet W (step s10).

Then, the surface temperature of the backup roll 3 is measured by the temperature measuring unit 4 over the width direction TD (step s11).

Then, it is determined whether or not the surface temperature of the backup roll 3 is within the reference range over the width direction TD (step s12), and if there is a portion outside the reference range, the roll temperature profile changing portion is controlled to change the heating position. The positions of the unit 53 and the cooling position changing unit 58 are adjusted, and heating by the roll heating unit 51 and cooling (that is, temperature control) by the roll cooling unit 56 are performed (step s13).

Further, the film thickness t of the coating liquid Q applied to the surface of the long sheet W is measured by the film thickness measuring unit 6 over the width direction TD (step s21).

Then, it is determined whether or not the film thickness t of the applied coating liquid Q is within the reference range over the width direction TD (step s22), and if there is a portion outside the reference range, the roll temperature profile changing portion is controlled. The positions of the heating position changing unit 53 and the cooling position changing unit 58 are adjusted, and the roll heating unit 51 heats and the roll cooling unit 56 cools (that is, temperature control) to adjust the film thickness (step s23).

After that, it is determined whether or not to continue the coating operation based on the elapsed time after the start of the coating operation, the transport distance of the long sheet W, the presence or absence of the coating stop command, and the like (step s30). If the coating is to be continued, the above steps s10 to s30 are repeated. On the other hand, when the coating is not continued, the driving of the sheet transport unit M is stopped (step s31) to end the series of flows.

FIG. 5 is a schematic view showing the state during and after coating in an example of the embodiment embodying the present invention.

5 (a) and 5 (c) show a state in which the slit die 2 and the backup roll 3 are being applied as viewed from the downstream side, and FIGS. 5 (b) and 5 (d) show a long sheet. The state after the coating liquid Q is applied to the surface of W (the lower surface side in this figure) is shown as a cross-sectional view.

FIG. 5A illustrates a state in which the diameter of the right end side d1 of the backup roll 3, the diameter of the central portion d2, and the diameter of the left end side d3 are the same.
In such a state, the distance between the surface (lower surface side) of the long sheet W supported by the backup roll 3 and the tip of the slit die 2 (coating gap G: specifically, the right end side G1 and the central portion). The same applies to G2 and G3) on the left end side. Therefore, as shown in FIG. 5B, the film thickness t (specifically, the right end side t1, the central portion t2, and the left end side) of the coating liquid Q after being applied to the surface (lower surface side) of the long sheet W. t3) is also the same.

On the other hand, FIG. 5C illustrates a state in which the diameter of the right end side d1 of the backup roll 3 is smaller than the diameter of the central portion d2, and the diameter of the left end side d3 is larger than the diameter of the central portion d2. In such a state, the distance between the surface (lower surface side) of the long sheet W supported by the backup roll 3 and the tip of the slit die 2 (coating gap G) G1 to G3 is such that the right end side G1 is the central portion. It is wider than G2 and narrower on the left end side G3 than the central part G2. Therefore, as shown in FIG. 5D, the film thickness t of the coating liquid Q after being applied to the surface (lower surface side) of the long sheet W is such that the right end side t1 is thicker than the central portion t2 and the central portion. The left end side t3 is thinner than t2.

Therefore, the control unit 9 can control the roll temperature profile changing unit 5 to approach the state shown in FIGS. 5A and 5B.
Specifically, when the film thickness t of the coating liquid Q is thicker than the reference range, the control unit 9 adjusts the position of the roll heating unit 51 by the heating position changing unit 53, and the roll heating unit 51 adjusts the position of the backup roll 3 by the roll heating unit 51. The surface of the surface is heated locally. Then, the backup roll 3 absorbs heat from the outer peripheral surface and has a larger diameter in the heated portion than in the unheated portion due to internal heat conduction. Where the backup roll 3 has a large diameter, the coating gap G becomes narrower than the others, and the film thickness t of the coating liquid Q to be applied becomes thin.

On the contrary, when the film thickness t of the coating liquid Q is thinner than the reference range, the control unit 9 adjusts the position of the roll cooling unit 56 by the cooling position changing unit 58, and the roll cooling unit 56 adjusts the position of the backup roll 3 by the roll cooling unit 56. Locally cool the surface. Then, heat is released from the outer peripheral surface of the backup roll 3, and the diameter of the cooled portion becomes smaller than that of the uncooled portion due to internal heat conduction. When the diameter of the backup roll 3 is small, the coating gap G becomes wider than the others, and the film thickness t of the coating liquid Q to be applied becomes thicker.

With such a configuration, the coating device 1 according to the present invention can adjust the coating gap G by appropriately adjusting the diameter of the backup roll 3. Therefore, even if the backup roll 3 and the slit die 2 are deformed over time due to the influence of the temperature change, such as when the temperature of the long sheet W is different from the atmospheric temperature or when there is a local temperature change in the apparatus. , The film thickness t of the coating liquid Q can be made uniform. Alternatively, even in a scene that is not affected by the temperature change, it is possible to improve the processing accuracy of the backup roll 3 and the slit die 2, and the non-uniformity of the film thickness t due to sagging after assembly, deformation, and the like.

[Another form]
(About film thickness measuring unit 6)
In the above description, as a specific example of the film thickness measuring unit 6, a configuration that outputs an electric signal, numerical data, etc. according to the film thickness of the coating liquid Q based on the transmission amount and transmittance of X-rays, β rays, etc. is exemplified. bottom. With such a configuration, even if the long sheet W or the coating liquid Q is a material that does not transmit visible light, infrared rays, ultraviolet rays, or the like, a desired film thickness can be measured, which is preferable. However, if the long sheet W is a transparent body or a translucent body that transmits visible light, infrared rays, ultraviolet rays, etc., and the coating liquid Q is a translucent body, the irradiation unit 61 and the measurement unit 62 of the film thickness measuring unit 6 , Visible light, infrared rays, ultraviolet rays, etc. may be irradiated and measured.

Further, the film thickness measuring unit 6 is not limited to the above-described configuration, and may be configured to measure the step difference between the portion where the coating liquid Q is applied and the portion where the coating liquid Q is not applied on the surface of the long sheet W. good.

Further, in the above description, the film thickness measuring unit 6 is provided as a specific example of the coating device 1, and the control unit 9 sets the roll temperature profile changing unit 5 based on the film thickness distribution in the width direction TD measured by the film thickness measuring unit 6. The configuration to be controlled is shown. With such a configuration, a target value of the film thickness t of the coating liquid Q to be applied to the surface of the long sheet W is set in advance, and the control unit 9 controls the roll temperature profile changing unit so as to approach the target value. Therefore, it is preferable.

However, in embodying the present invention, the film thickness measuring unit 6 is not an indispensable configuration, and the film thickness measuring unit 6 may be omitted. Even in this case, the desired temperature profile can be obtained by associating the correlation between the temperature profile of the width direction TD of the backup roll 3 and the film thickness t of the coating liquid Q applied to the surface of the long sheet W in advance. If the roll temperature profile changing unit is controlled by the control unit 9 so as to approach, the film thickness t of the coating liquid Q can be kept within a predetermined range (that is, uniform).

(About roll temperature profile changing unit 5)
In the above description, as a specific example of the coating device 1, the roll temperature profile changing unit 5 includes a roll heating unit 51, a heating position changing unit 53, a roll cooling unit 56, and a cooling position changing unit 58. Such a configuration is preferable because fine temperature adjustment can be sequentially and automatically controlled over the width direction TD of the long sheet W.

However, in embodying the present invention, the heating position changing unit 53 and the cooling position changing unit 58 are not limited to the configuration in which they are sequentially and automatically controlled by the control unit 9, but are configured to be manually changed and fixed by the operator. You may. For example, instead of the actuator described above, a configuration may be provided including a rail extending in the width direction TD of the long seat W and a metal fitting or the like that can slide on the rail and be fixed at an arbitrary position.

Further, in embodying the present invention, the heating position changing unit 53 and the cooling position changing unit 58 are not indispensable configurations, but have a configuration in which one or both of the heating position changing unit 53 and the cooling position changing unit 58 are omitted. There may be.

Further, in embodying the present invention, the roll temperature profile changing unit 5 may not include both the roll heating unit 51 and the roll cooling unit 56, but may have either one.
Specifically, the roll cooling unit 56 and the like may be omitted, and only the roll heating unit 51 may be provided, or the roll heating unit 51 and the heating position changing unit 53 may be provided.
Alternatively, the roll heating unit 51 and the like may be omitted, and only the roll cooling unit 56 may be provided, or the roll cooling unit 56 and the cooling position changing unit 58 may be provided.

In the above description, the roll heating unit 51 includes three heating means (electric heaters) 52 over the width direction TD, and the roll cooling unit 56 includes three cooling means (air blow nozzles) 57 over the width direction TD. The configuration to be provided is illustrated. However, the number of the heating means 52 and the cooling means 57 is not limited to the above-mentioned number, and may be set as appropriate.

Further, in the above description, as a specific example of the heating means 52 and the cooling means 57, an example in which the backup roll 3 is arranged on the downstream side is shown. Since the backup roll 3 continues to rotate when the long sheet W is continuously conveyed, if it is heated and cooled in one direction (X direction in the figure) from the heating means 52 and the cooling means 57, it heats in the circumferential direction. Is transmitted. However, in embodying the present invention, the heating means 52 and the cooling means 57 are not limited to a configuration in which the backup roll 3 is heated / cooled from one direction, but a configuration in which the backup roll 3 is heated / cooled from multiple directions (so-called multi-stage method). It may be.

Further, in the above description, as a specific example of the heating means 52, a plurality of electric heating heaters arranged to face the outer peripheral surface of the backup roll 3 are shown. If an electric heater is used, temperature control can be easily performed with high resolution. Partial heating is also possible. Further, it is preferable because it is easy to make the temperature unevenness in the width direction uniform by adjusting the number and pitch when arranging a plurality of them.

However, the heating means 52 is not limited to such a configuration, and may have a configuration in which the hot air nozzle for blowing warm air is arranged to face the outer peripheral surface of the backup roll 3. Specifically, a plurality of hot air nozzles are arranged on the backup roll 3 over the width direction TD, and the warm air is locally blown to different places. Such a configuration is preferable because it can be installed relatively easily.

Further, in the above description, as a specific example of the cooling means 57, an air blow nozzle arranged to face the outer peripheral surface of the backup roll 3 is shown. Such a configuration is preferable because it can be installed relatively easily.

However, the cooling means 57 is not limited to such a configuration, and may be configured to cool to a predetermined temperature by passing cold water, a refrigerant, or the like inside the backup roll 3. In such a configuration, the backup roll 3 can always be cooled to a constant temperature even if the long sheet W which has become hot is conveyed through the dryer, which is preferable.

Further, the roll temperature profile changing unit 5 may have a configuration in which the backup roll 3 can be heated and cooled by an air blow nozzle arranged so as to face the outer peripheral surface of the backup roll 3. Specifically, the configuration is such that hot air and cold air can be introduced into the air blow nozzle, and the temperature and flow rate of the hot air and cold air are adjusted.

(About roll temperature measuring unit 4)
In the above description, as a specific example of the coating device 1, the roll temperature measuring unit 4 is arranged on the opposite side of the slit die 2 so as to sandwich the backup roll 3. However, in embodying the present invention, the roll temperature measuring unit 4 is not limited to this position, and may be configured to measure the surface temperature of the backup roll 3 from another direction. Further, the arrangement of the roll temperature measuring unit 4 and the roll temperature profile changing unit 5 shown in FIGS. 1 and 2 may be reversed.

(About slit die 2 and backup roll 3)
In the above description, as a specific example of the coating device 1, a configuration in which the slit die 2 is arranged below the backup roll 3 in order to coat the coating liquid Q on the lower surface side of the long sheet W is shown. However, in embodying the present invention, the arrangement of the slit die 2 with respect to the backup roll 3 can be appropriately set.

(About coating device 1)
In the above description, as a specific example of the coating device 1, the coating liquid Q is applied to the second surface side (lower surface side in the figure) in the double-sided coating line in which the coating liquid is applied to both sides of the long sheet W and dried. showed that. In the case of such a line configuration, the coating liquid Q is applied to the first surface side (upper surface side in the figure) of the long sheet W, and while the long sheet W is being conveyed after passing through the drying device DR1. The temperature is transmitted from the long sheet W, which has become hot, to the backup roll 3, and the diameter of the backup roll 3 may become non-uniform or change with time over the TD in the width direction. Therefore, if the present invention is applied, the coating gap G (and thus the film thickness t of the coating liquid Q) can be made uniform over the width direction TD, which is preferable.

However, the present invention is not limited to the coating device for the second surface side in such a double-sided coating line, and can be applied to various coating devices. For example, even in the form of applying the coating liquid Q to one side (first side) of the long sheet W, the temperature of the backup roll 3 or the slit die 2 partially becomes the atmospheric temperature over the TD in the width direction. It may be different or there may be local temperature changes within the device. Even if the backup roll 3 and the slit die 2 are deformed over time due to the influence of such a temperature change over the width direction TD, if the present invention is applied, the coating gap G (and thus the coating gap G) over the width direction TD is applied. , The film thickness t) of the coating liquid Q can be made uniform. Alternatively, even in a scene that is not affected by temperature changes, the coating gap (and thus the coating liquid Q) due to the processing accuracy of the backup roll or slit die, sagging after assembly, deformation, etc., over the TD in the width direction. The non-uniformity of the film thickness t) can be improved.

1 Coating device 2 Slit die 3 Backup roll 4 Temperature measuring unit 5 Roll temperature profile changing unit 6 Film thickness measuring unit 9 Control unit W Long sheet Q Coating liquid t Film thickness G Coating gap 51 Roll heating unit 52 Heating means (electric heating heater) )
53 Heating position change part 56 Roll cooling part 57 Cooling means (air blow nozzle)
58 Cooling position change part DR1 Drying device DR2 Drying device

Claims (4)

A coating device that applies a coating liquid to the surface of a long sheet that is continuously transported with a predetermined width in a width direction orthogonal to the transport direction, and a slit die that discharges the coating liquid toward the long sheet.
The long sheet is supported in the width direction from the surface opposite to the surface to which the coating liquid is applied so that the surface of the long sheet and the tip of the slit die are spaced apart from each other. At the same time, a backup roll that rotates in synchronization with the transport speed of the long sheet,
A roll temperature measuring unit that measures the surface temperature of the backup roll over the width direction,
A roll temperature profile changing unit for changing the temperature profile of the backup roll in the width direction is provided.
The roll temperature profile changing unit includes at least one of a roll heating unit that heats the backup roll and a roll cooling unit that cools the backup roll.
A coating device including a control unit that controls the roll temperature profile changing unit based on the measurement result measured by the roll temperature measuring unit. The roll temperature profile changing part is
A plurality of heating means arranged in the width direction of the backup roll are included.
The coating apparatus according to claim 1, further comprising a heating position changing portion for changing the position of each of the plurality of arranged heating means in the width direction. The roll temperature profile changing part is
A plurality of cooling means arranged in the width direction of the backup roll are included.
The coating apparatus according to claim 1 or 2, further comprising a cooling position changing portion for changing the positions of the plurality of cooling means arranged in the width direction. A film thickness measuring unit for measuring the film thickness of the coating liquid applied to the surface of the long sheet over the width direction is provided.
The control unit according to any one of claims 1 to 3, wherein the control unit controls the roll temperature profile changing unit based on the film thickness distribution in the width direction measured by the film thickness measuring unit. Coating device.

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