WO2023037574A1

WO2023037574A1 - Drying device

Info

Publication number: WO2023037574A1
Application number: PCT/JP2022/004366
Authority: WO
Inventors: 和夫野村; 敦渡邉; 徹中塩屋
Original assignee: 東レエンジニアリング株式会社
Priority date: 2021-09-10
Filing date: 2022-02-04
Publication date: 2023-03-16
Also published as: JP2023040652A

Abstract

A purpose of the present invention is to provide a drying device that can convey a base material in a stable state when drying a coating film formed on the base material. This drying device is provided on a conveyance path for roll-to-roll conveyance of a base material, and dries a coating film formed on the base material. The coating film is formed on a prescribed surface of the base material in a stripe pattern in the width direction of the base material so as to have a plurality of application sections on which the coating film is formed, and non-application sections where the coating film is not formed between the plurality of application sections. The drying device includes a drying nozzle that dries the coating film by blowing a gas on the prescribed surface of the base material and/or the reverse surface from the prescribed surface of the base material. The drying nozzle has a wind pressure regulation means for regulating such that the wind pressure at locations facing the non-application sections is lower than the wind pressure at locations facing the application sections.

Description

drying equipment

The present invention relates to a drying device that dries a coating film formed on a substrate while conveying a sheet-like substrate.

Conventionally, in the production process of electrode plates for lithium-ion batteries, an electrode material containing an active material, a binder, a conductive aid, and a solvent is applied to a sheet-like base material that is transported by roll-to-roll. There is a step of applying a slurry to form a coating film and drying the formed coating film with a drying device.

This drying apparatus heats the coating film by blowing hot air onto the surface of the substrate on which the coating film is formed or the surface on which the coating film is not formed, as shown in Patent Document 1 and Patent Document 2 below. , drying the coating film.

JP 2012-97917 A JP 2014-173803 A

However, in the drying apparatus as described in Patent Document 1 and Patent Document 2, there are cases where the substrate cannot be conveyed in a stable state when drying the coating film formed on the substrate. .

I will explain in detail. When forming a coating film on a base material, the coating film may be formed in stripes. That is, there are cases in which the coating film is formed on the substrate so as to have a plurality of coated portions in which the coating film is formed in the width direction of the substrate and a non-coated portion where the coating film is not formed between the plurality of coated portions. be. In this case, since the non-applied portion is lighter than the applied portion, the non-applied portion is more easily deformed by the wind pressure of the hot air blown by the drying device than the applied portion.

Therefore, when drying the coating film, if the drying device blows hot air onto the coated surface of the base material or the uncoated surface of the base material with uniform air pressure, the hot air As shown in FIG. 9, the applied portion T and the non-applied portion H are deformed by different amounts due to wind pressure. As a result, vibration occurs in the entire base material being transported, causing the base material to meander. In addition, the substrate is deformed such that the non-coated portion swells or hangs down. Due to the deformation of the non-coated portion or the vibration of the entire base material, the base material may come into contact with a member in the drying device such as a nozzle for blowing hot air, and may be damaged.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drying apparatus capable of conveying a substrate in a stable state when drying a coating film formed on the substrate. .

The drying apparatus of the present invention for solving the above problems is a drying apparatus that is provided on a conveying path for roll-to-roll conveying a base material and dries a coating film formed on the base material. A coating film is formed in a striped pattern in the width direction of the substrate so that the surface has a plurality of coating portions on which a coating film is formed and a non-coating portion on which no coating film is formed between the plurality of coating portions. and has a drying nozzle for drying the coating film by blowing gas against the predetermined surface of the base material and/or the back surface of the predetermined surface of the base material, and the drying nozzle faces the coating unit. It is characterized by having a wind pressure adjusting means for adjusting the wind pressure at the position facing the non-application portion to be smaller than the wind pressure at the position where the coating is applied.

According to the drying apparatus, the air pressure of the gas that the drying nozzle blows on the predetermined surface of the base material and/or the back surface of the predetermined surface of the base material is controlled by the air pressure adjusting means so that the position facing the non-coating part is lower than the position facing the coating part. is adjusted to be smaller, it is possible to suppress the difference in the amount of deformation between the applied portion and the non-applied portion due to the wind pressure of the blown gas. Therefore, since the vibration of the conveyed base material can be suppressed, meandering of the base material can be prevented, and the base material can be conveyed in a stable state when drying the coating film formed on the base material. Become. In addition, since it is possible to suppress deformation such that the non-coated portion swells or hangs down, it is possible to prevent the substrate from coming into contact with members in the drying device.

Further, the drying nozzle has a blowing part for blowing gas, and the air pressure adjusting means is a plurality of openings for sucking the gas blown by the blowing part, and the plurality of openings are formed in a base. It is arranged in the width direction of the material, a suction force is generated from each opening from a common suction means, and among the plurality of openings, the area of the opening facing the non-coating portion is larger than the area of the opening facing the coating portion. A configuration in which the area of the opening is larger may be adopted.

According to this configuration, it is possible to adjust with a simple configuration so that the wind pressure at the position facing the non-application portion is smaller than the wind pressure at the position facing the application portion.

Further, the wind pressure adjusting means is a plurality of openings for blowing out gas from the drying nozzle, and the plurality of openings are arranged in the width direction of the base material, and the gas supplied from a common supply section is supplied to each of the openings. of the plurality of openings, the area of the openings for blowing the gas to the non-application portion may be smaller than the area of the openings for blowing the gas to the application portion.

Also, a plurality of said openings are formed in a plate forming said drying nozzle,
A plurality of patterns of the plates may be replaceable.

According to this configuration, it is possible to easily adjust the size of the opening for adjusting the air pressure, corresponding to the positions of the applied portion and the non-applied portion.

Also, a configuration in which striped coating films are formed on both sides of the substrate may be employed.

According to this configuration, even when coating films are formed on both sides of the base material, the base material can be transported in a stable state when drying the coating films formed on both sides of the base material. Become.

Further, it may be configured to have an edge guide portion that contacts the width direction end of the base material and defines the conveying path of the end of the base material.

According to this configuration, since the width direction end portion of the base material and the edge guiding portion are in contact with each other, the vibration of the base material can be suppressed, and the coating film formed on the base material can be dried in a more stable state. It becomes possible to convey the base material with

According to the drying apparatus of the present invention, it is possible to convey the substrate in a stable state when drying the coating film formed on the substrate.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows roughly the coating apparatus provided with the drying apparatus in 1st embodiment of this invention. It is a figure for demonstrating the wind pressure adjustment means in 1st embodiment of this invention. It is a figure for demonstrating the drying nozzle in 1st embodiment of this invention. It is a figure for demonstrating the wind pressure adjustment means in 1st embodiment of this invention. It is a figure which shows the drying apparatus in 2nd embodiment of this invention. It is a figure for demonstrating the drying nozzle in 3rd embodiment of this invention. It is a figure for demonstrating the wind pressure adjustment means in 3rd embodiment of this invention. It is a figure for demonstrating the wind pressure adjustment means in 3rd embodiment of this invention. It is a figure which shows how to blow air to the base material in the conventional drying apparatus.

[First embodiment]
A drying apparatus according to a first embodiment of the present invention will be described with reference to the drawings. In the following description, the three axes of the orthogonal coordinate system are X, Y, and Z, the horizontal direction is expressed as the X-axis direction and the Y-axis direction, and the direction perpendicular to the XY plane (that is, the vertical direction) is the Z-axis. expressed as direction.

FIG. 1 is a diagram schematically showing a coating device 1 equipped with a drying device 2 according to the first embodiment. 2 and 4 are diagrams for explaining the wind pressure adjusting means 3 in the first embodiment. FIG. 3 is a diagram for explaining the drying nozzle 22 in the first embodiment, and is a side sectional view of the drying nozzle 22 in the Y-axis direction.

A coating apparatus 1 equipped with a drying device 2 according to the present embodiment includes a transport mechanism 11 for transporting a sheet-like substrate W as shown in FIG. It has a first coating mechanism 12 for forming a film M (see FIG. 2) and a second coating mechanism 13 for forming a coating film M by applying a coating liquid to the back surface of a predetermined surface of the substrate W. there is The drying device 2 is arranged on the transport path of the substrate W by the transport mechanism 11 . In addition, the predetermined surface of the base material W in this embodiment is the front surface of the base material W, and the back surface of the predetermined surface of the base material W is the back surface of the base material W. As shown in FIG. Here, the surface of the substrate W is the surface on which the coating film M is formed by the first coating mechanism 12 described later, and the back surface of the substrate W is the coating film M formed by the second coating mechanism 13 described later. is the surface on which is formed. Hereinafter, the predetermined surface of the substrate W is referred to as the front surface, and the back surface of the predetermined surface of the substrate W is referred to as the back surface of the substrate W.

The coating apparatus 1 in this embodiment forms coating films M on both sides of a substrate W conveyed by a conveying mechanism 11 by means of a first coating mechanism 12 and a second coating mechanism 13, and dries these coating films M. Dry with device 2 .

The base material W in the present embodiment is a metal foil that serves as a battery electrode plate for a lithium ion battery, and aluminum foil or the like is used when forming a positive electrode, and copper foil or the like is used when forming a negative electrode. The base material W is a strip-shaped sheet that is long in one direction, and is conveyed by the conveying mechanism 11 so as to pass through each section that constitutes the coating apparatus 1 .

The coating liquid in the present embodiment is, for example, a slurry containing an active material, a binder, a conductive aid, and a solvent, and is used as a material for electrode plates of lithium ion batteries (so-called electrode material). The coating film M is formed by coating the substrate W with this coating liquid.

The transport mechanism 11 in this embodiment is for transporting the base material W. As shown in FIG. 1, the transport mechanism 11 includes an unwinding roll 11a for unwinding the base material W, a winding roll 11b for winding the base material W, and a winding roll for winding the base material W unwound from the unwinding roll 11a. It has a transport roll 11c through which the base material W is wound up by the roll 11b, and a coating roll 11d that guides the base material W to a position where the coating liquid is applied by the first coating mechanism 12, which will be described later. Each roll of the conveying mechanism 11 is formed in a columnar shape and rotates about the central axis of the column.

The rotation of the unwinding roll 11a is driven and controlled by a control unit (not shown), and unwinds the base material W at a predetermined speed. The control unit is configured by, for example, a general-purpose computer device. The take-up roll 11b, like the unwind roll 11a, is driven and controlled in rotation by the control section, and winds the base material W while applying a predetermined tension to the base material W. As shown in FIG. It should be noted that the tension here means the tension in the conveying direction of the base material W (the X-axis direction in FIG. 1).

A plurality of transport rolls 11c are provided as shown in FIG. A part or all of the transport rolls 11c among the plurality of transport rolls 11c are driven and controlled in rotation by the control unit in the same manner as the unwind roll 11a and the winding roll 11b, and apply a predetermined tension to the base material W. The substrate W is conveyed while

The coating roll 11d is arranged so as to face a first coating mechanism 12, which will be described later, as shown in FIG. Therefore, the substrate W can be transported while keeping a constant distance from the first coating mechanism 12 .

With these configurations, the transport mechanism 11 can transport the base material W at a predetermined speed while applying a predetermined tension to the base material W.

The first coating mechanism 12 in this embodiment is for coating a coating liquid on the surface of the substrate W being transported to form the coating film M in stripes. Forming the coating film M in stripes means that the base material W has a plurality of coating portions T on which the coating film M is formed, and the coating film M is formed between the plurality of coating portions T, as shown in FIG. It is to form the coating film M in the width direction of the substrate W so as to have a non-coated portion H that is not covered. In this embodiment, the first coating mechanism 12 is a slit die for coating electrode material slurry, but the first coating mechanism 12 is not limited to a slit die. It may correspond to a coating method for use or gravure coating (the same applies to the second coating mechanism 13 to be described later).

The first coating mechanism 12 is formed long along the width direction of the substrate W (the Y-axis direction in FIG. 1). Here, the coating roll 11d described above is arranged at a predetermined interval with respect to the first coating mechanism 12 so that the rotation axis direction of the coating roll 11d and the width direction of the first coating mechanism 12 are parallel. It is

As shown in FIG. 1, the first coating mechanism 12 includes a manifold 14 that is connected to a supply path 18 and that is a space that is long in the width direction and that stores the coating liquid, and a slit 15 that is wide in the width direction and connected to the manifold 14. , and an ejection port 16 that has the same length as the slit 15 in the width direction and ejects the coating liquid. As a result, the coating liquid stored in the manifold 14 is ejected onto the substrate W from the ejection port 16 via the slit 15 . Further, the ejection port 16 faces the coating roll 11d with the base material W interposed therebetween. That is, the ejection port 16 faces the substrate W on the surface side of the substrate W. As shown in FIG. As a result, the coating liquid can be applied to the base material W while the distance between the ejection port 16 and the base material W is kept constant.

The first coating mechanism 12 is further provided with a shim plate (not shown) for forming the coating film M on the base material W in a stripe shape. The shim plate has, for example, a substantially comb shape and is arranged to divide the slit 15 in the width direction. When the coating liquid is applied while the slit 15 is divided in the width direction by the shim plate, the coating liquid is applied from the portion without the shim plate and is not applied from the portion with the shim plate. That is, the coating film M can be formed in stripes. The width of the coating film M can be adjusted by changing the shape of the shim plate. That is, the widths of the applied portion T and the non-applied portion H can be adjusted.

The supply path 18 connects the manifold 14 and the tank 17 in which the application liquid is stored. Then, the application liquid is supplied from the tank 17 to the manifold 14 through the supply path 18 by a pump (not shown).

The coating film M can be formed in stripes on the surface of the substrate W by the first coating mechanism 12 having these configurations.

The second coating mechanism 13 in this embodiment is for coating the back surface of the substrate W to be conveyed with the coating liquid to form the coating film M in stripes. The second coating mechanism 13 has the same configuration as the first coating mechanism 12 described above, as shown in FIG. It is arranged so as to face the base material W.

Then, the second coating mechanism 13 is supplied with the coating liquid from the tank 17 by the supply path 18 and a pump (not shown), and coats the back surface of the substrate W with the supplied coating liquid. Thereby, the stripe-shaped coating film M can be formed on the back surface of the base material W. As shown in FIG. The supply path 18 and the tank 17 for supplying the coating liquid to the second coating mechanism 13 are separate from the supply path 18 and the tank 17 for supplying the coating liquid to the first coating mechanism 12 in this embodiment. It is provided in The width of the coating film M formed on the back surface of the substrate W by the second coating mechanism 13 is preferably the same as the width of the coating film M formed on the front surface of the substrate W by the first coating mechanism 12. .

The first coating mechanism 12 and the second coating mechanism 13 can form the coating film M in stripes on both sides of the substrate W.

The drying device 2 in this embodiment is for drying the coating films M formed on both sides of the substrate W by the first coating mechanism 12 and the second coating mechanism 13 . As shown in FIG. 1, the drying device 2 is provided downstream of the first coating mechanism 12 and the second coating mechanism 13 on the transport path of the base material W by the transport mechanism 11, and includes a housing part 21, A drying nozzle 22 is provided inside the housing 21 and blows a gas onto the substrate W. It should be noted that the gas here is preferably hot air. Hereinafter, the gas blown from the drying nozzle 22 to the base material W is called hot air.

The housing part 21 is a box elongated in the conveying direction of the base material W, and has a space inside the box for the base material W to pass through, and an entrance for the base material W to enter and exit the space. have an exit. Then, the base material W on which the coating film M is formed is conveyed by the conveying mechanism 11 so as to pass through the housing part 21 .

It should be noted that the above-described transport roll 11c is not arranged inside the housing portion 21. Especially when the coating film M is formed on both surfaces of the base material W like this embodiment, the base material W cannot be touched until the coating film M dries. Therefore, in the housing part 21, the base material W is conveyed in a floating state except for at least both ends in the width direction. On the other hand, in the present embodiment, a predetermined tension is applied to the substrate W by the transport roll 11c arranged on the upstream side and the transport roll 11c arranged on the downstream side of the housing portion 21, and/or The substrate W is conveyed by the conveying mechanism 11 and passes through the housing portion 21 in a state in which a lift force is applied to the substrate W by blowing hot air from the back side of the substrate W from the drying nozzle 22 . ing.

The drying nozzle 22 is for heating the coating film M by blowing hot air onto the substrate W. The drying nozzle 22 is elongated in the width direction of the base material W as shown in FIGS. called).

The drying nozzles 22 are arranged below the base material W in the housing part 21, and are arranged above the base material W in the housing part 21. There is an upper nozzle 22b for blowing hot air onto the surface of the base material W, and these lower nozzles 22a and upper nozzles 22b are arranged alternately in the conveying direction of the base material W. As shown in FIG. Therefore, the base material W is conveyed in a substantially straight direction in a state in which the base material W is floated by the lift force applied to the base material W. By conveying the base material W substantially linearly in this way, it is possible to accurately convey the base material W in a predetermined direction even in a levitated state.

In addition, the drying nozzle 22 in this embodiment is composed of a hot air blowing section 23 and a suction mechanism 25 for adjusting the air pressure of the hot air blown by the blowing section 23, as shown in FIGS.

As shown in FIG. 2, the blowout part 23 is formed in a slit shape long in the width direction of the base material W and short in the direction of conveyance of the base material W at each of both ends of the drying nozzle 22 in the direction of conveyance of the base material W. there is As shown in FIG. 3, the drying nozzle 22 has a hollow portion 24 that communicates with the blowout portion 23, and hot air is supplied to the hollow portion 24 from a supply source (not shown). As a result, the hot air supplied from the supply source is blown out from the blowing part 23 via the hollow part 24 with substantially uniform wind pressure. With this configuration, the lower nozzle 22a blows hot air toward the substrate W from below, and the upper nozzle 22b blows hot air toward the substrate W from above. The coating film M is heated by the hot air and the solvent in the coating film M is vaporized, so that the coating film M is dried and solidified.

The suction mechanism 25 is a box elongated in the width direction of the base material W as shown in FIGS. ing. The plate member having a predetermined surface of the suction mechanism 25 is the plate 27 described above. The suction mechanism 25 is provided in the hollow portion 24 to form the slit-shaped blowout portion 23 described above.

The suction mechanism 25 is a so-called suction means for sucking the hot air blown onto the base material W. As shown in FIGS. have.

The air pressure adjusting means 3 is a plurality of openings 31 for sucking the hot air blown out from the blowing part 23 and formed in the plate 27 so as to be arranged in the width direction of the base material W. The suction mechanism 25 has, as shown in FIG. The discharge port 28 is a hole provided so as to discharge the hot air drawn from the opening 31 to the outside of the drying nozzle 22. As shown in FIGS. provided on the side. Therefore, the hot air drawn in from the opening 31 can be discharged without remaining in the cavity 26, so that the cavity 26 has a lower pressure than the space where the substrate W and the plate 27 face each other. As a result, since a suction force is generated in each opening 31 , the hot air is drawn into the hollow portion 26 by being sucked into each opening 31 .

Further, a not-shown suction force imparting means (for example, a pump) that imparts a suction force to the hollow portion 26 may be provided. By applying a suction force to the cavity portion by the suction force applying means, the pressure in the cavity portion 26 becomes further negative. Therefore, the hot air can be more positively sucked from each opening 31 than when there is no suction force applying means.

Further, as shown in FIG. 2, among the plurality of openings 31, the area of the opening 31b facing the non-application portion H is larger than the area of the opening 31a facing the application portion T. The amount of hot air drawn into the cavity 26 decreases as the area of the opening 31 decreases, and increases as the area of the opening 31 increases. Therefore, as shown in FIG. 4, the wind pressure of the hot air at the position facing the non-coating portion H is smaller than the wind pressure of the hot air at the position facing the coating portion T. As shown in FIG.

As a result, the wind pressure of the hot air blown by the drying nozzle 22 onto both surfaces of the substrate W can be adjusted so that the non-coated portion H is smaller than the coated portion T. A difference in the amount of deformation of the non-applied portion H can be suppressed.

Specifically, since the non-coated portion H is lighter than the coated portion T on which the coating film M is formed, the non-coated portion H is more likely to be exposed to the air pressure of the hot air blown from the drying nozzle 22 than the coated portion T. Easy to deform. Then, as shown in FIG. 9, when the hot air is blown to the applied portion T and the non-applied portion H with a uniform air pressure without adjusting the air pressure of the hot air, the applied portion T and the non-applied portion H differ in the air pressure of the hot air. Amount of deformation occurs. Therefore, vibration occurs in the entire substrate W being transported, which causes the substrate W to meander. In addition, as shown in FIG. 9, the substrate W is deformed such that the non-coated portion H rises or hangs down. Due to the deformation of the non-application portion H or the vibration of the entire base material W, the base material W may come into contact with a member such as the drying nozzle 22 inside the casing 21 and be damaged.

On the other hand, the area of the opening 31b facing the non-application portion H is made larger than the area of the opening 31a facing the application portion T as described above. As a result, as shown in FIG. 4, the wind pressure of the hot air blown out from the drying nozzle 22 is adjusted so that the wind pressure at the position facing the non-coating portion H is smaller than the wind pressure at the position facing the coating portion T. Therefore, the difference in the amount of deformation between the applied portion T and the non-applied portion H due to the wind pressure of the hot air blown can be suppressed. Therefore, since vibration of the substrate W being transported can be suppressed, meandering of the substrate W can be prevented. That is, the substrate W can be transported in a stable state when the coating film M formed on the substrate W is dried. In addition, since the non-applied portion H can be prevented from being deformed such that it swells or hangs down, the base material W can be prevented from coming into contact with the members inside the housing portion 21 . In addition, the air pressure of the hot air that the drying nozzle 22 blows onto the application portion T and the non-application portion H can be adjusted with a simple configuration.

Also, the plate 27 is preferably replaceable with plates of multiple patterns. Specifically, the plate 27 is detachable from the drying nozzle 22 (suction mechanism 25), and can be replaced with a plurality of patterns of plates having different sizes, shapes, and arrangements of the openings 31 to be formed. It's becoming That is, it is possible to appropriately change the plate to have a pattern corresponding to the width, thickness, and position of the coating film M.

As described above, according to the drying device 2 in the above embodiment, it is possible to transport the substrate W in a stable state when drying the coating films M formed on both surfaces of the substrate W.

In the present embodiment, among the plurality of openings 31 communicating with the hollow portion 26, the area of the opening 31b facing the non-applied portion H is larger than the area of the opening 31a facing the applied portion T. Although the example of adjusting the wind pressure of the hot air blown to W has been described, the present invention is not limited to this. For example, each opening 31 may be connected to a different suction force applying means, and the amount of hot air sucked by each opening 31 may be adjusted. As a result, the air pressure of the hot air blown onto the substrate W can be adjusted without changing the size of the area of the opening 31 .

[Second embodiment]
Next, a drying device 2 according to a second embodiment of the present invention will be described with reference to FIG. This embodiment differs from the first embodiment in that the drying device 2 has an edge nip portion 4 .

5A and 5B are views showing a drying apparatus 2 according to a second embodiment of the present invention, FIG. 2 is a side cross-sectional view of body 21. FIG.

The drying apparatus 2 in the present embodiment has an edge nip portion 4 which is a kind of edge guide portion for contacting the width direction end portion of the base material W and defining the conveying path of the end portion of the base material W. . The edge nip portion 4 is for nipping both ends of the base material W in the width direction as shown in FIGS. The nip roll 41 is formed in a cylindrical shape and rotates about the central axis of the cylinder. Each of the nip rolls 41 is arranged at a position facing both ends in the width direction of the base material W on the front side and the back side of the base material W and capable of nipping the base material W from the front side and the back side. . A plurality of sets of these are arranged in the conveying direction of the base material W as a set of nip rolls 41 . Therefore, it is possible to dry the coating film M formed on the base material W in a state in which at least both widthwise end portions of the base material W are sandwiched within the housing portion 21 to define the conveying path of the end portions of the base material W. can.

As a result, hot air is blown onto both sides of the base material W while both widthwise ends of the base material W are sandwiched, so that vibration of the base material W being transported can be further suppressed. Therefore, it becomes possible to transport the substrate W in a more stable state when drying the coating film M formed on the substrate W.

Further, of the pair of nip rolls 41, the two nip rolls 41 located on the same side of the base material W are tilted so that their rotation axes form a substantially V shape as shown in FIG. 5(a). Good. At this time, the set of nip rolls 41 is tilted so as to extend the substrate W to be sandwiched toward both ends of the substrate W in the width direction. As a result, the base material W can be stretched toward both ends in the width direction of the base material W, so that bending of the base material W in the width direction can be reduced.

[Third Embodiment]
Next, a drying device 2 according to a third embodiment of the present invention will be described with reference to FIGS. 6, 7 and 8. FIG. In the present embodiment, the drying nozzle 22 does not have the blowing part 23 and the suction mechanism 25, and a plurality of openings are formed in a plate 27 which is a plate-like member having a surface facing the surface of the substrate W of the drying nozzle 22. This embodiment differs from the first and second embodiments in that hot air adjusted to a predetermined air pressure is blown out from 31 (air pressure adjusting means 3).

FIG. 6 is a diagram for explaining the drying nozzle 22 in this embodiment, and is a side sectional view of the drying nozzle 22 in the Y-axis direction. 7 and 8 are diagrams for explaining the wind pressure adjusting means 3 in this embodiment.

The drying nozzle 22 in this embodiment has wind pressure adjusting means 3 as shown in FIGS. The wind pressure adjusting means 3 is a plurality of openings 31 for blowing out hot air from the drying nozzles 22 . The plurality of openings 31 are formed in the plate 27 so as to be arranged in the width direction of the base material W. As shown in FIG. The plurality of openings 31 communicate with the hollow portion 24, and hot air is supplied from a common supply portion (not shown). Then, the supplied hot air is blown out from the opening 31 and blown onto the substrate W. As shown in FIG.

Further, as shown in FIG. 7, among the plurality of openings 31, the area of the opening 31b for blowing hot air toward the non-coating portion H is smaller than the area of the opening 31a for blowing hot air toward the coating portion T. there is The amount of hot air supplied from the common supply unit and blown out from each opening 31 increases as the area of the opening 31 increases, and decreases as the area of the opening 31 decreases. Therefore, as shown in FIG. 8, the wind pressure of the hot air blown onto the non-application portion H is smaller than the wind pressure of the hot air blown onto the application portion T. As shown in FIG.

As a result, the wind pressure of the hot air blown by the drying nozzle 22 onto both surfaces of the substrate W can be adjusted so that the non-coated portion H is smaller than the coated portion T. A difference in the amount of deformation of the non-applied portion H can be suppressed. Therefore, the vibration of the substrate W being transported can be suppressed, and the meandering of the substrate W can be prevented. That is, the substrate W can be transported in a stable state when the coating film M formed on the substrate W is dried. In addition, since the non-applied portion H can be prevented from being deformed such that it swells or hangs down, the base material W can be prevented from coming into contact with the members inside the housing portion 21 . In addition, the air pressure of the hot air that the drying nozzle 22 blows onto the application portion T and the non-application portion H can be adjusted with a simple configuration.

In this embodiment, the wind pressure adjusting means 3 is a plurality of openings 31, and among the plurality of openings 31 to which hot air is supplied from a common supply section, the area of the opening 31a through which the hot air is blown toward the application section T Although an example in which the air pressure of the hot air blown onto the substrate W is adjusted by reducing the area of the opening 31b through which the hot air is blown toward the non-application portion H has been described, the present invention is not limited to this. For example, each opening 31 may be connected to a different supply unit (not shown) to adjust the amount of hot air supplied to each opening 31 . As a result, the air pressure of the hot air blown onto the substrate W can be adjusted without changing the size of the area of the opening 31 .

Also, the wind pressure adjusting means 3 may be a slit (not shown). Specifically, the slit is formed on the plate 27 or in the vicinity of the plate 27 to be wider in the width direction of the base material W, and the portion blows hot air toward the non-coating portion H than the portion blowing hot air toward the coating portion T. is formed narrower in the conveying direction of the substrate W. As a result, the air pressure of the hot air blown toward the non-application portion H can be adjusted to be smaller than the air pressure of the hot air blown toward the application portion T. FIG.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings, but the configurations and combinations thereof in each embodiment are examples, and additions, omissions, Substitutions and other modifications are possible. For example, in the above-described embodiment, an example in which the striped coating film M is formed on both sides of the substrate W has been described. A coating film M may be formed on one side of the substrate W. That is, the coating device 1 may be configured to have either the first coating mechanism 12 or the second coating mechanism.

Further, in the above embodiment, an example in which the coating film M is dried by blowing hot air onto both surfaces of the base material W has been described. The coating film M may be dried by blowing hot air on the . That is, the drying apparatus 2 may be configured such that the drying nozzle 22 is arranged on either the front surface side or the rear surface side of the substrate W. As shown in FIG.

Also, in FIGS. 2 and 7, the opening 31 is represented by a circle, but it is not limited to this.

Also, the number and arrangement of the parts constituting the coating device 1 are not limited to those shown in FIG. For example, further transport rolls 11c may be provided, and each transport roll 11c may be arranged at a position where a desired tension can be applied to the base material W.

Further, in the above-described embodiment, an example in which the coating films M having the same width are formed at the same positions on both sides of the substrate W is shown, but the positions and widths of the coating films M formed on both sides of the substrate W are not always the same. It does not matter if they are not the same.

In addition, in the above embodiment, an example in which both ends of the base material W are nipped by a plurality of nip rolls 41 has been described in the description of the edge guiding portion, but the present invention is not limited to this. For example, rolls in contact with the front side of the base material W and rolls in contact with the back side of the base material W may be alternately arranged. Since these rolls are in contact with the vicinity of the width direction end of the base material W within the housing part 21, the coating film formed on the base material W in a state in which the conveying path of the end part of the base material W is defined. M can be dried. Thereby, the vibration of the base material W can be suppressed. Moreover, even if the substrate W is misaligned and comes off the rolls, it can be easily returned to its original position as compared with the case where the substrate W is clamped.

2 and 7, the openings 31 provided in the drying nozzle 22 are arranged so as not to exceed the range of dimensions in the width direction of the base material W. They may be arranged beyond the range of dimensions in the width direction of W. As a result, the wind pressure of the hot air blown onto the base material W by the drying nozzle 22 can be adjusted from a range exceeding the dimension in the width direction of the base material W, so that the vibration of the base material W can be further suppressed.

1 Coating Device 11 Conveying Mechanism 11a Unwinding Roll 11b Winding Roll 11c Conveying Roll 11d Coating Roll 12 First Coating Mechanism 13 Second Coating Mechanism 14 Manifold 15 Slit 16 Discharge Port 17 Tank 18 Supply Path 2 Drying Device 21 Case Body Part 22 Drying Nozzle 22a Lower Drying Nozzle 22b Upper Drying Nozzle 23 Blowing Part 24 Cavity 25 Suction Mechanism 26 Cavity 27 Plate 28 Exhaust Port 3 Wind Pressure Adjusting Means 31 Opening 31a Opening 31b Opening 4 Edge Nip Part 41 Nip Roll W Substrate M Coating film T Coated part H Non-coated part

Claims

A drying device provided on a transport path for transporting a base material roll-to-roll and drying a coating film formed on the base material,
A predetermined surface of the base material is striped in the width direction of the base material so as to have a plurality of coated parts on which a coating film is formed and a non-coated part on which no coating film is formed between the plurality of the coated parts. A coating film is formed,
a drying nozzle for drying the coating film by blowing gas against the predetermined surface of the substrate and/or the back surface of the predetermined surface of the substrate;
A drying apparatus, wherein the drying nozzle has air pressure adjusting means for adjusting the air pressure at a position facing the non-application portion to be smaller than the air pressure at a position facing the application portion.
The drying nozzle has a blowing part for blowing gas,
The wind pressure adjusting means is a plurality of openings for sucking the gas blown by the blowing part,
The plurality of openings are arranged in the width direction of the substrate, and a common suction means generates a suction force from each opening,
2. The drying apparatus according to claim 1, wherein, among the plurality of openings, an area of the opening facing the non-coating portion is larger than an area of the opening facing the coating portion.
The wind pressure adjusting means is a plurality of openings for blowing gas from the drying nozzle,
The plurality of openings are arranged in the width direction of the substrate, and the gas supplied from a common supply unit is blown out from each of the openings,
2. The drying apparatus according to claim 1, wherein, among the plurality of openings, the area of the openings for blowing gas to the non-coating portion is smaller than the area of the openings for blowing gas to the coating portion.
a plurality of said openings formed in a plate forming said drying nozzle;
4. The drying apparatus according to claim 2, wherein said plates of a plurality of patterns are replaceable.
The drying apparatus according to any one of claims 1 to 4, characterized in that striped coating films are formed on both sides of the substrate.
6. The dryer according to any one of claims 1 to 5, further comprising an edge guiding portion that contacts the widthwise end of the base material and defines a conveying path of the end of the base material. Device.