JP2019150799A - Coating head and manufacturing method for web with coated film - Google Patents

Abstract

To provide a coating head configured so that a curl and folding do not occur at an end part of a web, and a manufacturing method for a web with a coated film.SOLUTION: A coating head 2a for coating both sides of a web 1 to be carried with coating liquid comprises: a liquid-storage part 6 for storing coating liquid, which has an opening 10 for the web 1 to be carried to pass therethrough formed at an upstream side in a web carrying direction thereof; a measuring part, provided closer to a downstream side in the web carrying direction than the liquid-storage part 6, which has slits, in which a web width direction in which the carried web 1 passes through the liquid-storage part is set to be a longitudinal direction, formed therein, and adjusts quantities of the coating liquid which is coated to both sides of the web by adjusting an interval of the slits; and a shield member 9a, provided in the liquid-storage part, at a predetermined interval, from both end parts in the web width direction across the outside in the web-width direction of a running surface of the web 1, which is arranged so that a surface thereof perpendicular with respect to the web width direction faces the inside of the liquid-storage part 6 and at least part of the vertical surface dips in coating liquid 7 stored in the liquid-storage part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coating head for forming a coating film on both sides of a web, and a method for producing a web with a coating film using the coating head.

  As a method of forming a coating film on both sides of the web, a method of applying a coating liquid to the web by arranging a coating head such as a roll, a knife, and a slit die on both sides across the web is known. It is appropriately selected depending on the composition and viscosity of the coating liquid to be applied and the thickness and precision of the target coating film.

  As an application head for applying a coating film on both sides of a web, Patent Document 1 discloses that a web passes through a coating liquid that accumulates in a liquid storage part, and then passes between two measuring units that are horizontally spaced. An application head that forms a coating film is disclosed, and can be suitably used because it can be applied to both sides of the web at the full width of the web.

  The demand for thin-film products having a thickness of less than 10 μm is increasing for webs in order to achieve high functionality such as miniaturization and weight reduction. There is an urgent need to improve productivity by coating a thin film web, which is a disadvantageous condition for coating and transport, at a high yield with a high yield.

JP 2011-12266 A

  The coating head of Patent Document 1 is a measuring unit that is installed with two webs spaced horizontally after the web is immersed in the coating liquid continuously accumulated from above the coating head and passes through the coating liquid. The coating liquid that accumulates in the liquid storage is always swirled by the web transport, and a flow from the wall surface of the liquid storage section toward the web occurs on the surface of the coating liquid in the liquid storage section. ing. Therefore, a flow from the wall surface of the liquid storage portion located at both ends of the coating head in the width direction acts on the end portion of the web in the coating head when immersed in the coating liquid surface.

In general, since the rigidity of the web is reduced as the thickness is reduced, curling and folding are caused by the flow toward the end of the web, particularly at the end of the thin web having low rigidity.
Further, when the coating speed is high, the flow of the coating liquid surface in the liquid storage portion also becomes fast, so that curling and folding of the web edge portion becomes more remarkable.

  When curl or crease occurs at the end of the web, it causes meandering and wrinkling during conveyance, and a helicopter height is generated at the edge portion of the wound roll, resulting in poor winding shape, and stable production cannot be performed.

In particular, when a crease occurs, the folded part is likely to be caught by the weighing unit when passing between the two weighing units installed horizontally spaced apart. And production must be interrupted,
Accordingly, an object of the present invention is to provide a coating head that does not cause curling or bending at the end of the web in the liquid storage section, and a method for producing a coated web using this coating head.

The first coating head of the present invention that solves the above problems is a coating head that coats a coating liquid on both sides of a web to be conveyed,
An opening for introducing the web to be conveyed is on the upstream side in the web conveying direction, and a liquid storage part for storing the coating liquid;
A slit is formed on the downstream side in the web conveyance direction from the liquid storage unit, and the web width direction through which the web conveyed in the liquid storage unit passes is a longitudinal direction. A weighing unit that adjusts the amount of coating liquid applied to both sides of the
A shielding member provided in the liquid storage part at a predetermined interval from both ends in the web width direction of the running surface of the web to the outside in the web width direction, and having a surface perpendicular to the web width direction. The vertical surface faces the inside of the liquid storage part, and a shielding member is provided so that at least a part of the vertical surface is immersed in the coating liquid stored in the liquid storage part.

The first coating head of the present invention that solves the above problem is a coating head that coats a coating liquid on both sides of a web to be conveyed,
An opening for introducing the web to be conveyed is on the upstream side in the web conveying direction, and a liquid storage part for storing the coating liquid;
A slit is formed on the downstream side in the web conveyance direction from the liquid storage unit, and the web width direction through which the web conveyed in the liquid storage unit passes is a longitudinal direction. A weighing unit that adjusts the amount of coating liquid applied to both sides of the
In the liquid storage part, in the vicinity of both end portions in the web width direction of the web running surface, facing each other across the surface including the web running surface at a predetermined interval from the surface including the web running surface. A shielding member provided on the web, having a plane parallel to the running surface of the web, the parallel surface facing a surface including the running surface of the web, and at least a part of the parallel surface is stored. And a shielding member provided so as to be immersed in the coating liquid stored in the liquid portion.

  In the second coating head of the present invention, it is preferable that a part of the shielding member facing the surface including the running surface of the web faces the web running surface.

  The second coating head of the present invention has a predetermined distance from the both ends of the web running surface in the web width direction between the shielding members facing each other across the surface including the web running surface. And has a surface perpendicular to the web width direction, the perpendicular surface facing the inside of the liquid storage section, and at least a part of the vertical surface is stored in the liquid storage section. It is preferable to have the 2nd shielding member provided so that it might be immersed in a liquid.

The method for producing a coated web of the present invention uses the first or second coating head of the present invention,
A web is inserted from the opening of the liquid storage unit, conveyed in the coating liquid stored in the liquid storage unit, passed through the slit of the measuring unit, and a predetermined amount measured by the measuring unit. A method for producing a coated web in which a coating liquid is applied to both sides of a web and a coating film is formed on both sides of the web,
When the web is transported in the coating liquid, the flow of the coating liquid located on the outer side in the web width direction from the positions of the both ends of the web toward the end of the web is shielded by the shielding member. A coating film is formed on.

The manufacturing method of the web with a coating film of another aspect of the present invention uses the second coating head of the present invention having the second shielding member,
A web is inserted from the opening of the liquid storage unit, conveyed in the coating liquid stored in the liquid storage unit, passed through the slit of the measuring unit, and a predetermined amount measured by the measuring unit. A method for producing a coated web in which a coating liquid is applied to both sides of a web and a coating film is formed on both sides of the web,
When the web is transported through the coating liquid, the shielding liquid and the second shielding member cause the coating liquid located on the outer side in the web width direction from the positions of both ends of the web to flow toward the edge of the web. Shield with and form a coating on both sides of the web.

  In the present invention, the “web traveling surface” is a virtual surface corresponding to a position where the web travels in the coating head when the web is actually conveyed.

  According to the coating head of the present invention, even when high-speed coating is performed on a thin film web, curling and folding do not occur at the edge of the web, enabling stable conveyance and coating, and producing a high-quality coated web. It becomes possible to do.

FIG. 1 is a schematic perspective view of a first coating head of the present invention. FIG. 2 is a top view of the coating head of FIG. 3 is a front left half sectional view of the coating head corresponding to line A1-A1 in FIG. 4 is a side sectional view of the coating head corresponding to the line A2-A2 in FIG. FIG. 5 is a top view of a conventional coating head. 6 is a front left half sectional view of the coating head corresponding to line B1-B1 in FIG. FIG. 7 is a side sectional view of the coating head corresponding to line B2-B2 in FIG. FIG. 8 is a top view of the second coating head of the present invention. FIG. 9 is a front left half sectional view of the coating head corresponding to line C1-C1 in FIG. FIG. 10 is a top view of an aspect in which the shielding member 9 is disposed at a position on the inner side in the width direction in the coating head of FIG. 11 is a front left half sectional view of the coating head corresponding to line D1-D1 in FIG. FIG. 12 is a top view showing a state in which the web meanders in the right direction by the coating head of FIG. FIG. 13 is a top view of the second coating head of the present invention provided with the second shielding member 16. FIG. 14 is a front left half sectional view of the coating head corresponding to line E1-E1 in FIG.

  A preferred embodiment of the coating head and the method for producing a coated web according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the form shown in the drawings.

[First coating head]
FIG. 1 shows a schematic perspective view of a first coating head of the present invention. FIG. 2 shows a top view of the coating head of FIG. FIG. 3 is a front left half sectional view of the coating head corresponding to the line A1-A1 in FIG. FIG. 4 is a side sectional view of the coating head corresponding to the line A2-A2 in FIG.

  As shown in FIGS. 1 and 4, the first application head 2 a of the present invention includes a liquid storage unit 6 and a measuring unit 11.

  As shown in FIGS. 1 and 4, the liquid storage section 6 is formed so as to be surrounded by a head member A4, a head member B3, and side plates 5, 5 '. The coating liquid 7 is stored in the liquid storage section 6.

  As shown in FIG. 4, the head member A4 and the head member B3 are disposed so as to face each other with a gap therebetween, and a slit 12 whose width direction is the longitudinal direction of the web 1 is formed. By adjusting the distance between the slits 12, the amount of the coating film applied to both surfaces of the web 1 can be adjusted. The portion where the slit 12 is formed becomes the measuring portion 11.

  The coating using the coating head 2a is performed by introducing the web 1 from the opening 10 located on the upstream side of the liquid storage unit 6 of the coating head 2a and transporting the web 1 downward, and storing the liquid in the liquid storage unit 6 at this time. By immersing the web 1 in the liquid 7, the coating liquid 7 is brought into contact with the entire width of the web 1, and the coating liquid 7 is measured by passing through a measuring unit 11 that measures a predetermined amount.

  Since the amount of the coating liquid 7 stored in the liquid storage unit 6 is reduced by application, a supply pipe (not shown) is provided so as to supply the coating liquid 7 to the liquid storage unit 6, and the liquid storage unit 6. It is preferable that the amount of the coating liquid 7 is kept substantially constant.

  The shielding member 9a is supported by the metal member 8 from the head member A4, and is disposed in the vicinity of both ends of the web traveling surface, which is the position where the web 1 travels within the coating head 2. Further, the shielding member 9 a is disposed so that a part thereof is immersed in the coating liquid 7.

  The position and shape of the metal fitting 8 are not particularly limited, but are preferably attached to either the head member A4 or the head member B3. When adjusting the measuring unit 11 by changing the interval between the slits 12, the head member B3 is moved relative to the head member A4, so that the metal fitting 8 is attached across the head member A4 and the head member B3. It is better not to.

  The shielding member 9a will be described while comparing the flow of the coating liquid 7 inside the first coating head of the present invention and the conventional coating head.

  FIG. 5 shows a top view of a conventional coating head. FIG. 6 shows a front left half sectional view of the coating head corresponding to line B1-B1 in FIG. FIG. 7 is a side sectional view of the coating head corresponding to the line B2-B2 in FIG.

  The flow of the coating liquid 7 in the conventional coating head 2c shown in FIG. 5 is swirled in the direction indicated by the arrow when the web 1 is conveyed from above to below as seen from the side as shown in FIG. It is flowing.

  Further, at the end in the width direction of the coating head, as shown in FIGS. 5 and 6, a flow is generated from the wall surface of the liquid storage unit 6 toward the web 1.

  Therefore, when the rigidity of the web 1 is low, a flow from the wall surface (the liquid contact surface of the side plate 5) of the liquid storage unit 6 located at both ends in the width direction of the coating head 2 c acts toward the end of the web 1. Is immersed in the surface of the coating liquid 7, the end of the web 1 is pushed by the flow, and curling and folding 14 occur at the end of the web.

  Here, it is particularly important that the curl or crease 14 occurs starting from the portion where the web 1 is immersed in the coating liquid 7. That is, the flow on the surface of the coating liquid 7 presses the edge of the web, which causes the curl and the break 14.

  Accordingly, when the coating speed is high, the flow of the surface of the coating liquid 7 is also fast, so that the curl or fold 14 at the web edge becomes more prominent.

  Regardless of the thickness of the web 1, when the free span until the web 1 is immersed in the coating liquid 7 is long, the distance between the web supports in the web conveyance direction is long, so that the web edge is slightly affected by disturbance. Easy to receive. Accordingly, since the web 1 is easily affected by the flow of the coating liquid surface, curling and folding 14 at the web end portion are more likely to occur.

  In many cases, the web 1 itself is easily curled with a slight external force due to a thermal history when the web 1 is formed or a residual distortion at the end portion when the web 1 is slit.

For this reason, the curl or fold 14 may occur at both ends of the web 1 or may occur only at one end.

  On the other hand, in the first coating head 2a of the present invention shown in FIG. 2, the shielding member 9a is spaced from the both ends of the running surface of the web 1 in the web width direction by a predetermined width direction interval 13 outside the web width direction. It is provided in the liquid reservoir 6.

  The shielding member 9 a has a surface perpendicular to the web width direction, and the perpendicular surface faces the inside of the liquid storage unit 6, and at least a part of the vertical surface is stored in the liquid storage unit 6. It arrange | positions so that it may be immersed in the coating liquid 7 to be formed.

  By adopting such a configuration, as shown in FIGS. 2 and 3, on the surface of the coating liquid 7, the wall surfaces (liquid contact surfaces of the side plates 5) of the liquid storage section 6 located at both ends in the width direction of the coating head 2a. To the end of the web 1 is blocked by the shielding member 9a. Further, since the vertical surface of the shielding member 9a faces inward, the flow around the shielding member 9a can be prevented from acting on the end portion of the web 1, so that the end portion of the web 1 is not curled or broken. If the surface facing the inside of the liquid storage portion 6 of the shielding portion 9a is not a vertical surface but a surface that is convex toward the inside, a flow around the shielding member 9a is generated, so that the web 1 end portion There is a concern of curling or breaking.

  The size of the vertical surface facing the inside of the liquid storage part 6 of the shielding member 9a is such that the wall surface of the liquid storage part 6 located at both ends in the width direction of the coating head 2a (the side plate 5) A smaller one is preferable as long as the flow from the liquid contact surface) toward the end of the web 1 can be suppressed. As the area of the vertical surface is smaller, the coating liquid 7 can be prevented from staying in the vicinity of both ends of the liquid storage section 6 with the shielding member 9a as a boundary.

  The area of the vertical surface is preferably determined as appropriate depending on the viscosity of the coating liquid 7, the conveyance speed of the web 1, the size of the liquid storage section 6, and the like. If it is about 2, it is often possible to achieve both curl and breakage prevention and retention prevention.

  The depth at which the shielding member 9a is immersed in the coating liquid 7 is such that the flow from the wall surface (the liquid contact surface of the side plate 5) of the liquid storage unit 6 located at both ends in the width direction of the coating head 2a to the end of the web 1 can be suppressed. The viscosity is preferably determined in consideration of the viscosity of the coating liquid 7, the conveyance speed of the web 1, the size of the liquid storage unit 6, and the change in the liquid level due to the coating liquid consumption and the coating liquid supply.

  The width direction interval 13 from the both ends in the web width direction to the shielding member 9a is perpendicular to the inside of the liquid storage part 6 of the shielding member 9a when the web 1 is narrow in a range where the web 1 does not contact the shielding member 9a due to meandering. Since the flow which goes to the edge part of the web 1 from a smooth surface can be reduced, it is preferable.

  The shape of the shielding member 9a is such that the flow from the wall surface (liquid contact surface of the side plate 5) of the liquid storage unit 6 located at both ends in the width direction of the coating head 2a to the end of the web 1 can be suppressed. It can be any shape such as a block or plate shape as long as it can have a vertical surface, but it must be easy to manufacture and be in contact with the coating solution and must be kept clean. Therefore, it is preferably a plate shape that can be easily cleaned.

  The material of the shielding member 9a is not particularly limited. However, if there is a concern about contact with the web 1, it is preferable to use a resin because the web 1 can be prevented from being damaged or broken. When the coating liquid 7 contains a solvent, it is preferable to use a solvent resistant resin such as polytetrafluoroethylene.

[Second application head]
The second coating head of the present invention will be described with reference to FIGS. FIG. 8 shows a top view of the second coating head of the present invention. 9 is a front left half sectional view corresponding to line C1-C1 of FIG.

  The shielding member 9b is a web having a predetermined facing interval 15 from the surface including the web traveling surface in the vicinity of both ends in the web width direction of the web traveling surface where the web 1 travels within the coating head 2b. It is provided in the liquid storage part 6 so that it may oppose on both sides of the surface containing this traveling surface. The shielding member 9b only needs to face the virtual surface including the web traveling surface, and may not face the web traveling surface.

  The shielding member 9b has a surface parallel to the traveling surface of the web, and the parallel surface faces the surface including the traveling surface of the web, and at least a part of the parallel surface is in the liquid storage section 6. It arrange | positions so that it may be immersed in the coating liquid 7 stored.

  The shielding member 9b has a surface parallel to the running surface of the web, and this parallel surface faces the surface including the running surface of the web, so that the facing interval 15 is between the parallel planes formed by the shielding member 9b. The flow resistance becomes higher than the surroundings. Therefore, the flow from the wall surface of the liquid storage unit 6 (the liquid contact surface of the side plate 5) located at both ends in the width direction of the coating head 2 toward the end of the web 1 is slow, and acts on the end of the web to curl or break. No force is generated until it is generated.

  On the other hand, the coating liquid 7 existing in the facing interval 15 of the shielding member 9b is flowing although the flow is slow. Therefore, the coating liquid 7 is difficult to stay and application failure due to contamination is less likely to occur.

  Further, since the opposing shielding member 9b is provided so that the position where the traveling surface of the web extends outward in the web width direction is between the opposing intervals 15, even if the web 1 is meandering, the shielding member 9b There is no contact with 9b.

  Since the shielding member 9b does not cause curling or bending, the flow from the wall surface (the liquid contact surface of the side plate 5) of the liquid storage unit 6 located at both ends in the width direction of the coating head 2b to the end of the web 1 can be suppressed. As described above, it is preferable to increase the flow resistance by narrowing the facing interval 15 or increasing the length in the width direction of the shielding member 9b. However, the viscosity of the coating liquid 7, the conveyance speed of the web 1, and the size of the liquid storage section 6 are preferred. These may be determined as appropriate.

  Further, the depth at which the shielding member 9b is immersed in the coating liquid 7 is such that the flow from the wall surface (the liquid contact surface of the side plate 5) of the liquid storage unit 6 located at both ends in the width direction of the coating head 2b toward the end of the web 1 is performed. In order to be suppressed, it is determined appropriately in consideration of the viscosity of the coating liquid 7, the conveyance speed of the web 1, the size of the liquid storage section 6, and the change in the liquid level due to the consumption of the coating liquid and the supply of the coating liquid. Is preferred.

  Moreover, the narrower one in the width direction interval 13 from both ends in the web width direction to the shielding member 9b is from the wall surface (the liquid contact surface of the side plate 5) of the liquid storage part 6 located at both ends in the width direction of the coating head 2. In the flow toward the edge part of the web 1, it becomes difficult to receive the influence of the flow of the diagonal arrow shown in FIG.

  FIG. 10 is a top view of the coating head 2b of FIG. 8 when the shielding member 9b is disposed at a position on the inner side in the width direction of the coating head 2b. 11 is a front left half sectional view of the coating head corresponding to line D1-D1 in FIG. FIG. 12 is a top view showing a state in which the web meanders to the right in the width direction of the coating head 2 by the coating head of FIG.

  When the amount of meandering of the web 1 is large, as shown in FIG. 10, the shielding members 9b facing each other across the surface including the traveling surface of the web are arranged so that a part thereof faces the web traveling surface. And it is preferable that it exists in the state which the edge part of the web 1 and the shielding member 9b have overlapped.

  When the web 1 meanders from the state shown in FIG. 10 as shown in FIG. 12, the amount of overlap between the web 1 and the shielding member 9b increases on the right side in the web width direction shown in FIG. At this time, the web 1 is shielded while maintaining the suppression of the flow from the wall surface (the liquid contact surface of the side plate 5 ′) of the liquid storage unit 6 positioned at the right end in the width direction of the coating head 2 toward the end of the web 1. There is no contact with the member 9b.

  On the other hand, the left side in the web width direction is in a state where the end of the web 1 is not overlapped with the shielding member 9b, but even in this state, it is in the same state as the coating head shown in FIG. . For this reason, the suppression of the flow from the wall surface (the liquid contact surface of the side plate 5) of the liquid storage unit 6 located at the left end of the coating head 2b in the width direction to the end of the web 1 can be maintained. No curling or folding.

  The amount of overlap is a meandering amount or a widthwise interval 13 that can suppress the flow from the wall surface (the liquid contact surface of the side plate 5) of the liquid storage unit 6 located at both ends in the width direction of the coating head 2 b to the end of the web 1. It is preferable to determine appropriately based on the maximum value and the width direction length of the shielding member 9b.

  FIG. 13 is a top view showing still another embodiment of the second coating head. FIG. 14 is a front left half sectional view of the coating head corresponding to line E1-E1 in FIG.

  When the flow of the surface of the coating liquid 7 is extremely fast due to the viscosity of the coating liquid 7 and the conveyance speed of the web 1, and there is an increased concern about curling and folding, the shielding member 9 b facing the surface including the traveling surface of the web It is preferable to have the 2nd shielding member 16 in between. The second shielding member 16 is provided with a predetermined width direction interval 13 ′ on the outer side in the web width direction from both ends in the web width direction of the running surface of the web, and has a surface perpendicular to the web width direction. The vertical surface faces the inside of the liquid storage unit 6, and at least a part of the vertical surface is immersed in the coating liquid 7 stored in the liquid storage unit 7.

  Since the 2nd shielding member 16 interrupts | blocks reliably the flow which goes to the edge part of the web 1 from the wall surface (liquid contact surface of the side plate 5) of the liquid storage part 6 located in the both ends of the width direction of the coating head 2b, No curling or folding occurs at both ends of 1.

  The depth at which the second shielding member 16 is immersed in the coating liquid 7 is a flow from the wall surface (liquid contact surface of the side plate 5) of the liquid storage unit 6 located at both ends in the width direction of the coating head 2b toward the end of the web 1. In consideration of the viscosity of the coating liquid 7, the conveyance speed of the web 1, the size of the liquid storage unit 6, and the change in the liquid level due to the consumption of the coating liquid and the supply of the coating liquid. It is preferable.

  As described above, when the coating head of the present invention is used, it is possible to perform stable coating without causing curling or bending at the edge of the web, and curling at the edge even when the web is widened, thinned, or applied at high speed. Since no breakage occurs, a stable conveyance state and a good winding shape can be obtained, so that a high-quality web with a coating film can be produced.

<Example 1>
Using a coating head 2a shown in FIG. 2, coating was performed on a plastic film having a thickness of 10 μm and a width of 300 mm at a slit interval of a measuring portion of 50 μm and a coating speed of 30 m / min.
As the shielding member 9a, a plate made of polytetrafluoroethylene having a thickness of 2 mm × 15 mm × 15 mm was installed at a position 10 mm apart in the width direction from the end of the web, and was immersed in the liquid surface by 10 mm.
From the start of application, stable application was possible without curling or breaking.

<Example 2>
A coating head 2b shown in FIG. 8 was used, and the coating conditions were the same as in Example 1.
For the shielding member 9b, a polytetrafluoroethylene plate having a thickness of 2 mm × 15 mm × 15 mm was placed at a position with a facing interval of 3 mm and a width direction interval of 5 mm from the web end surface, and immersed in the liquid surface by 10 mm.
From the start of application, stable application was possible without curling or breaking.

<Comparative Example 1>
A coating head 2c shown in FIG. 5 was used, and the coating conditions were the same as in Example 1.
In the process of starting coating and increasing the coating speed to 30 m / min, the coating liquid at the end in the coating head width direction starts to flow toward the end of the web and curls at the same time, reaching a coating speed of 30 m / min. Immediately before reaching, it turned into a fold.

  The present invention can be applied to the production of webs such as papers, metal thin films, films, and cloths that are simultaneously coated on both sides, but is not limited thereto.

1 Web 2a, 2a ', 2b, 2c Coating head 3 Head member B
4 Head member A
5, 5 'Side plate 6 Liquid storage part 7 Coating liquid 8 Metal fittings 9a, 9b Shield member 10 Opening 11 Metering part 12 Slit 13, 13' Width direction interval 14 Curl, fold 15 Opposite interval 16 Second shielding member

Claims (6)

An application head for applying a coating liquid on both sides of a web to be conveyed,
An opening for introducing the web to be conveyed is on the upstream side in the web conveying direction, and a liquid storage part for storing the coating liquid;
A slit is formed on the downstream side in the web conveyance direction from the liquid storage unit, and the web width direction through which the web conveyed in the liquid storage unit passes is a longitudinal direction. A weighing unit that adjusts the amount of coating liquid applied to both sides of the
A shielding member provided in the liquid storage part at a predetermined interval from both ends in the web width direction of the running surface of the web to the outside in the web width direction, and having a surface perpendicular to the web width direction. And a shielding member provided so that the vertical surface faces the inside of the liquid storage portion, and at least a part of the vertical surface is immersed in the coating liquid stored in the liquid storage portion. . An application head for applying a coating liquid on both sides of a web to be conveyed,
An opening for introducing the web to be conveyed is on the upstream side in the web conveying direction, and a liquid storage part for storing the coating liquid;
A slit is formed on the downstream side in the web conveyance direction from the liquid storage unit, and the web width direction through which the web conveyed in the liquid storage unit passes is a longitudinal direction. A weighing unit that adjusts the amount of coating liquid applied to both sides of the
In the liquid storage part, in the vicinity of both end portions in the web width direction of the web running surface, facing each other across the surface including the web running surface at a predetermined interval from the surface including the web running surface. A shielding member provided on the web, having a plane parallel to the running surface of the web, the parallel surface facing a surface including the running surface of the web, and at least a part of the parallel surface is stored. And a shielding member provided so as to be immersed in the coating liquid stored in the liquid portion.   The coating head according to claim 2, wherein a part of the shielding member facing the web including a running surface of the web faces the web running surface.   Between the shielding members facing each other across the surface including the traveling surface of the web, the web traveling surface is provided with a predetermined interval from the both ends in the web width direction to the outside in the web width direction. A second surface provided so as to be immersed in a coating liquid stored in the liquid storage portion, the vertical surface facing the inner side of the liquid storage portion. The coating head according to claim 2, comprising the shielding member. Using the coating head according to any one of claims 1 to 3,
A web is inserted from the opening of the liquid storage unit, conveyed in the coating liquid stored in the liquid storage unit, passed through the slit of the measuring unit, and a predetermined amount measured by the measuring unit. A method for producing a coated web in which a coating liquid is applied to both sides of a web and a coating film is formed on both sides of the web,
When the web is transported through the coating liquid, the coating liquid that shields the flow of the coating liquid on the outer side in the web width direction from the position of both ends of the web toward the end of the web is provided with the coating member. Web manufacturing method. Using the coating head of claim 4,
A web is inserted from the opening of the liquid storage unit, conveyed in the coating liquid stored in the liquid storage unit, passed through the slit of the measuring unit, and a predetermined amount measured by the measuring unit. A method for producing a coated web in which a coating liquid is applied to both sides of a web and a coating film is formed on both sides of the web,
When the web is transported through the coating liquid, the shielding liquid and the second shielding member cause the coating liquid located on the outer side in the web width direction from the positions of both ends of the web to flow toward the edge of the web. The manufacturing method of the web with a coating film shielded by.

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