JPWO2019181916A1 - Coating device and coating system - Google Patents

Abstract

Provided are a coating device and a coating system for simultaneously applying at least two kinds of coating liquids in a striped pattern on one bar. The coating device is used for a long bar extending in the width direction orthogonal to the running direction and rotating in contact with at least one surface of a long substrate that runs continuously in a specific running direction via a coating liquid. It is provided upstream in the traveling direction of the substrate, and has a weir plate that allows the coating liquid to flow in the traveling direction of the substrate through the bar. The coating device includes a main body block that rotatably supports the bar, a plurality of weir plates arranged along the longitudinal direction of the bar, and a plurality of supply units provided for each weir plate to supply the coating liquid to the weir plates. And have. In the coating system, the coating devices are arranged so as to face each other across the substrate, and the coating liquid is simultaneously applied to both surfaces of the substrate in a pattern.

Description

In the present invention, various liquid substances are applied to a sheet-like or long-shaped substrate to be coated such as a thin metal plate, paper and a film by using a long bar extending in a width direction orthogonal to the traveling direction. The present invention relates to a coating apparatus and a coating system for coating at least two kinds of coating liquids at the same time in a striped pattern on one bar.

Conventionally, when a functional layer such as an easy-adhesion layer or an antistatic layer is formed on the surface of a long substrate, a coating liquid is applied to the surface of the substrate to form a coating film. As a method of applying the coating liquid to the surface of the substrate, many coating methods such as a roll coating method, a die coating method, a spray coating method, and a bar coating method are known. A long substrate is also called a web. Further, a long substrate is also simply referred to as a substrate.

Various coating devices for applying the coating liquid to the substrate have been proposed. For example, Patent Document 1 describes a coating device that applies a coating liquid to the upper surface of a substrate. The coating device of Patent Document 1 is provided with a bar that rotates in contact with the upper surface of a web that travels continuously via a coating liquid, and a bar that is provided on the upstream side of the web in the traveling direction with respect to the bar, and the coating liquid is applied to the bar. It has a weir plate that circulates in the web direction through the space. In the coating device of Patent Document 1, when the distance between the weir plate and the edge of the bar closest to the weir plate is A, and the distance between the weir plate and the web is B, A is 0.5 to 5 mm. B is 0.5 to 5 mm, and B ≦ A.

JP-A-2015-77589 JP-A-2002-159899

In the coating apparatus of Patent Document 1 described above, only one type of coating liquid can be applied to the upper surface of the substrate. For this reason, manufacturing loss occurs due to product type switching when the coating liquid is replaced.
In addition, since only one type of coating liquid can be applied, the sample cut out by applying the coating liquid has only one type of function, and when a product is produced by arranging samples having different functions in the width direction, the sample bonding process is required. You will need it. Therefore, the manufacturing cost is high.
Further, when the web is made of resin, a stretching step of stretching in a direction orthogonal to the traveling direction of the web (hereinafter, width direction) may be provided. In this case, in order to make the web thickness uniform in the width direction, it is necessary to apply a coating liquid uniform in the width direction before stretching. Therefore, it is necessary to apply the coating liquid wider than the product width, and finally, the coating liquid having functionality may be applied to the outside of the product width. However, the web outside the product width may be discarded, the coating liquid outside the product width may be wasted, and the web outside the product width may not be reused due to the mixing of the coating liquid. Therefore, the profit rate is lowered.

From the above, it is also required to apply two or more kinds of coating liquids in a striped pattern at the same time, but the coating apparatus of Patent Document 1 cannot cope with this.
Therefore, as a device capable of applying two or more kinds of functions, there is a reverse coating method as in Patent Document 2. However, in the reverse coating method, a backup roll (hereinafter referred to as a roll) must be provided on the back surface of the web to prevent displacement fluctuation of the web. Therefore, due to the configuration, a roll is required on the back surface of the web, and one coating portion is used. Simultaneous application to the upper and lower surfaces of the web is not possible. Therefore, there is a problem that a large amount of capital investment such as drying equipment is required and the equipment becomes large.
As described above, there is currently no sufficient coating device for simultaneously coating two or more kinds of coating liquids in a striped pattern.

An object of the present invention is to provide a coating device and a coating system for simultaneously applying at least two kinds of coating liquids in a striped pattern on one bar.

In order to achieve the above object, the present invention has a width direction orthogonal to the traveling direction in which the invention rotates in contact with at least one surface of a long substrate that continuously travels in a specific traveling direction via a coating liquid. A coating device having a long bar that extends and a weir plate that is provided upstream of the bar in the traveling direction of the substrate and allows the coating liquid to flow in the traveling direction of the substrate through the bar. Coating having a main body block that rotatably supports, a plurality of weir plates arranged along the longitudinal direction of the bar, and a plurality of supply portions provided for each weir plate to supply the coating liquid to the weir plates. It provides a device.

The distance between the weir plates in the longitudinal direction of the bar is preferably 3 mm or more.
It is preferable that each of the plurality of weir plates can be repositioned in the longitudinal direction of the bar.
It is preferable that the plurality of weir plates each have a liquid pool portion between the bar and the plurality of weir plates, and the capacity of the liquid pool portion can be changed for each of the plurality of weir plates.
It is preferable that the plurality of dam plates can be moved with respect to the traveling direction of the substrate, and the distance between the bar and the dam plate in the traveling direction can be changed.

The cross-sectional area S of the liquid pool portion in the plane composed of the traveling direction and the height direction perpendicular to the traveling direction is 20 mm ² or more and 100 mm ² or less, and the cross-sectional area S of the liquid pool portion is the bar in the plane. Passing through the peripheral surface on the upstream side in the traveling direction, the line passing through the center of rotation of the bar and the shortest distance between the end surface on the upstream side in the traveling direction of the bar and the dam plate, and the intersection of the line passing the shortest distance and the dam plate. Moreover, it is preferable that the area is the area of the portion surrounded by the line perpendicular to the surface of the substrate and the substrate.
It is preferable that the plurality of weir plates are provided with side plates at both ends in the longitudinal direction of the bar.
Of the plurality of weir plates, it is preferable that a side plate is provided at the longitudinal end of the bar of the weir plate facing between the adjacent weir plates.
It is preferable that the main body block or each weir plate has a liquid feeding storage unit for storing the coating liquid.
Further, the present invention provides a coating system in which the coating apparatus of the present invention is arranged so as to face each other with the substrate interposed therebetween and the coating liquid is simultaneously applied to both surfaces of the substrate in a pattern.

According to the present invention, it is possible to provide a coating device capable of simultaneously applying at least two kinds of coating liquids in a striped pattern with one bar.
Further, it is possible to provide a coating system capable of applying at least two kinds of coating liquids in a pattern on both surfaces of a substrate at the same time.

It is a schematic perspective view which shows the 1st example of the coating apparatus of embodiment of this invention. It is a schematic side view which shows the 1st example of the coating apparatus of embodiment of this invention. It is a schematic perspective view which shows the 2nd example of the coating apparatus of embodiment of this invention. It is a schematic perspective view which shows the 3rd example of the coating apparatus of embodiment of this invention. It is a schematic side view which shows the 3rd example of the coating apparatus of embodiment of this invention. It is a schematic diagram which shows the 1st example of the coating system of embodiment of this invention. It is a schematic diagram which shows the 2nd example of the coating system of embodiment of this invention.

The coating apparatus and coating system of the present invention will be described in detail below based on the preferred embodiments shown in the accompanying drawings.
It should be noted that the figures described below are exemplary for explaining the present invention, and the present invention is not limited to the figures shown below.
In the following, "~" indicating the numerical range includes the numerical values described on both sides. For example, when ε is a numerical value α to a numerical value β, the range of ε is a range including the numerical value α and the numerical value β, and is α ≦ ε ≦ β in mathematical symbols.
Angles such as "specific numerical angles", "parallel", "vertical" and "orthogonal" include error ranges generally tolerated in the art, unless otherwise stated.

(First example of coating device)
FIG. 1 is a schematic perspective view showing a first example of the coating device according to the embodiment of the present invention, and FIG. 2 is a schematic side view showing the first example of the coating device according to the embodiment of the present invention.
The coating device 10 shown in FIG. 1 coats the coating liquid M on the upper surface 30a or the lateral surface of a long substrate 30 that continuously travels in a specific traveling direction D1, and at least two types of coating are applied by one bar 12. The liquid M can be simultaneously applied in a striped pattern.
The lateral surface means that when the substrate 30 in the state shown in FIG. 1 is rotated 90 ° around the traveling direction D1 and in the height direction D3, the upper surface 30a faces sideways, and the upper surface 30a at this time is referred to as a lateral surface. ..
The height direction D3 is a direction perpendicular to the upper surface 30a or the lateral surface of the substrate 30. Further, the orientation of the substrate 30 changes on the horizontal surface. In this case, the height direction D3 of the horizontal surface corresponds to the width direction D2 in the state of the substrate 30 of FIG. The width direction D2 is a direction orthogonal to the traveling direction D1 in the upper surface 30a of the substrate 30.

The coating device 10 will be described by taking as an example a device in which three types of coating liquids M are simultaneously applied in a striped pattern on one bar 12. The coating device 10 includes, for example, one long bar 12 extending in the width direction D2 orthogonal to the traveling direction D1, a main body block 14, three weir plates 16, three supply pipes 20, and three supplies. It has a part 22 and. Further, in the coating device 10, each of the plurality of weir plates 16 has a liquid collecting portion 17 (see FIG. 2) for storing the coating liquid M and a liquid feeding storage portion 24 between the bar 12 and the bar 12.

The coating device 10 is provided on the upstream side of the traveling direction D1 of the long substrate 30 with respect to the bar 12, and the weir plate 16 for circulating the coating liquid M through the bar 12 to the long substrate 30 is described above. For example, it has three. The three weir plates 16 are arranged apart from each other with a gap 27 with respect to one bar 12 along the longitudinal direction of the bar 12, that is, along the width direction D2. A supply pipe 20 is provided on each of the three weir plates 16, and a supply unit 22 is connected to each supply pipe 20.
If there are a plurality of weir plates 16, the number is appropriately determined according to the number of patterns to be applied at the same time, and the number is not particularly limited.

The bar 12 is a long member extending in the width direction D2 orthogonal to the traveling direction D1, and is, for example, a columnar shape. The bar 12 is rotatably supported by the main body block 14 as described below. The longitudinal direction of the bar 12 and the width direction D2 are in a parallel relationship.
The bar 12 can come into contact with the upper surface 30a or the side surface of the long substrate 30 that continuously travels in the specific traveling direction D1 via the coating liquid M, and rotates at the rotation center Cr. The rotation direction of the bar 12 is not particularly limited, and may be the same direction as or opposite to the traveling direction D1 of the substrate 30.

The diameter of the bar 12 is preferably 1 mm to 20 mm, more preferably 6 mm to 13 mm. By setting the diameter of the bar 12 within the above range, it is possible to suppress the generation of vertical streaks on the coating surface of the coating liquid M.
The surface of the bar 12 may be finished to be smooth, but may be provided with grooves at regular intervals in the circumferential direction, or the wire may be tightly wound. It may be a so-called wire bar. In this case, the diameter of the wire wound around the bar is preferably 0.05 to 0.5 mm, particularly preferably 0.05 to 0.2 mm. In the bar 12 provided with the groove and the bar 12 around which the wire is wound, the coating liquid M can be thinned by making the groove depth shallow or the wire thin, and the groove depth can be reduced. By deepening or thickening the wire, the coating liquid M can be thickened.

The width of the bar may be the same as the width of the substrate 30, but is preferably longer than the width of the substrate 30. When the bar is provided with a groove or a wire, the range in which the groove or the wire is provided is preferably equal to or larger than the width of the substrate 30.

The material of the bar is preferably stainless steel, and particularly preferably SUS (Steel Use Stainless) 304 or SUS (Steel Use Stainless) 316. In addition, SUS430, SUS630 and the like can be mentioned. The surface of the bar may be surface-treated with hard chrome plating, diamond-like carbon (DLC), titanium nitride (TiN), or the like.

The main body block 14 rotatably supports the bar 12, and has a structure that rotatably supports the bar 12.
For example, the main body block 14 has an arcuate groove formed on the surface in contact with the bar 12. By forming an arcuate groove in the main body block 14, it is possible to suppress the bending of the bar 12 due to the tension of the substrate 30, and to form uniform coating films 32a to 32c in the width direction D2.

In the main body block 14, the material of the side in contact with the bar 12 and the side not in contact with the bar 12 need not be the same. For example, when the bar 12 is made of metal such as stainless steel, the side of the main body block 14 in contact with the bar 12 is made of polymer resin or the like, and the side of the main body block 14 not in contact with the bar 12 is made of metal such as stainless steel. Is preferable.

The size of the main body block 14 is appropriately determined according to the size of the bar 12. For example, the thickness of the main body block 14 in the traveling direction D1 is preferably not more than the radius of the bar 12 and not more than twice the diameter of the bar 12. Further, the height of the main body block 14 in the height direction D3 is preferably 10 to 100 mm.
Further, the width of the main body block 14 in the width direction D2 is not particularly limited, and may be a single block structure having the same length as the bar 12, or a divided block structure having the same length as the weir plate 16. Well, pattern application is possible with any structure. From the viewpoint of suppressing mixing of the coating liquid, it is more preferable that the main body block 14 has a divided block structure.

The weir plate 16 is arranged on the upper surface 30a of the substrate 30.
The weir plate 16 is provided with a protruding portion 16a on the upper surface 30a side of the substrate 30. The end surface 16c facing the upper surface 30a of the protruding portion 16a is, for example, a surface parallel to the upper surface 30a of the substrate 30 in a flat state without waviness or the like.
The weir plate 16 is provided with a slit 15 between the side surface 16b and the main body block 14 and between the side surface 16b and the bar 12. The slit 15 extends in the width direction D2, and the coating liquid M is sent to the slit 15.

The end surface 16c of the weir plate 16 is a surface parallel to the upper surface 30a as described above, but the surface is not limited to this and may be a slope.
By providing the protruding portion 16a on the weir plate, it is possible to increase the rigidity of the entire weir plate while keeping the thickness of the end portion of the weir plate below a predetermined value.

Further, a liquid feed storage unit 24 is provided at the boundary between the main body block 14 and the weir plate 16. The liquid feed storage unit 24 communicates with the slit 15. The liquid feed storage unit 24 may be provided on the main body block 14 or each weir plate 16, or may be provided straddling the main body block 14 and each weir plate 16.
The liquid feed storage unit 24 is provided over the entire area in the width direction D2 between the main body block 14 and each weir plate 16, for example.
By providing the liquid feed storage unit 24, the coating liquid M flows uniformly in the width direction D2 and then flows to the substrate 30, so that the coating liquid M can be uniformly applied in the width direction D2. Further, it is possible to have a configuration in which the liquid feeding storage unit 24 is not provided, but in this case, it becomes difficult for the fed liquid M to be filled in the width direction D2, and the coated liquid M flows only in the fed portion, so that the end An air retention portion (not shown) in which air is retained is generated in the portion 25 or the like. Bubbles brought in from the liquid feeding system or the like accumulate in this air retention portion (not shown), and the effect of suppressing bubble repelling is small, which may eventually lead to a bubble repelling failure.

The supply pipe 20 is provided on each weir plate 16 as described above. In one weir plate 16, the supply pipe 20 passes through the weir plate 16 and reaches the liquid feed storage unit 24. For example, one supply unit 22 is connected to one supply pipe 20.
The supply unit 22 is provided on each weir plate 16 as described above, and supplies the coating liquid M to the bar 12 for each weir plate 16. The supply unit 22 includes a tank for storing the coating liquid M (not shown), a pump for feeding the coating liquid M (not shown), and a valve for adjusting the amount of the coating liquid M (not shown). It has a control unit (not shown) that adjusts the amount of opening and closing of the valve. As the supply unit 22, a known liquid supply device capable of supplying a predetermined amount of liquid can be appropriately used.
By providing the supply unit 22 on each weir plate 16, the supply amount of the coating liquid M can be adjusted in units of the weir plate 16, and the loss of the coating liquid M can be reduced. As a result, productivity can be increased.
Further, by providing the supply unit 22 on each weir plate 16, the coating liquid M can be changed for each weir plate 16, whereby the composition of the coating films 32a to 32c and the like can be changed. For this reason, the coating device 10 of FIG. 1 has a configuration having three weir plates 16, but the coating liquid M of each weir plate 16 may be the same or different. The coating films 32a, 32b, and 32c to be formed can have, for example, the same coating film 32a and the same coating film 32c, but different coating films 32b.

The total thickness of the weir plate 16 excluding the protruding portion is preferably in the range of 5 to 50 mm. The total thickness is the length in the traveling direction D1.
Further, the length of the weir plate 16 in the height direction D3 is preferably 10 to 100 mm.
The width of the weir plate 16 is not particularly limited, and coating can be performed with a width equivalent to the width of the weir plate 16. Therefore, the width of the weir plate 16 is appropriately determined according to the width of the coating film.
Further, when the main body block 14 has a block structure divided as described above, the width of the weir plate 16 may be the same as that of the main body block 14.
The distance δ between the gaps 27 of the weir plates 16 in the width direction D2 is preferably 3 mm or more, more preferably 5 mm or more. If the interval δ is narrow, the coating liquid M of the adjacent weir plate 16 may be mixed. The upper limit of the gap δ of the gap 27 is not particularly limited, and is appropriately set according to the width of the substrate, the number of coating films, the arrangement of coating films, and the like.

The material of the weir plate 16 is not particularly limited, and is, for example, metal or resin. Examples of the metal include stainless steel, and it is particularly preferable to use SUS (Steel Use Stainless) 304 or SUS (Steel Use Stainless) 316.
In addition to this, the weir plate may be a metal obtained by hard chrome plating or diamond-like carbon treatment.

The weir plate 16 provided on the upstream side of the bar 12, that is, on the approach side of the substrate 30 to the bar 12, can increase the internal pressure of the coating liquid M. Therefore, it is possible to suppress repelling caused by air accompanying. The repellent accompanied by air will be explained in detail later. In addition, the repellent accompanied by air is also simply referred to as the repellent accompanied by air.

In the coating device 10, the cross-sectional area S of the liquid pool portion 17 in the plane PL composed of the traveling direction D1 and the height direction D3 is preferably 20 mm ² or more and 100 mm ² or less, more preferably 30 mm ² or more and 50 mm. It is ² or less. The cross-sectional area S of the liquid pool portion 17 is a line passing through the peripheral surface on the upstream side in the traveling direction of the bar, the end surface on the upstream side in the traveling direction of the bar passing through the center of rotation of the bar, and the shortest distance between the dam plate. It is the area of the portion surrounded by the line passing through the shortest distance and the intersection of the dam plate, the line perpendicular to the surface of the substrate, and the substrate, and is the area of the region of reference numeral S shown in FIG.
The coating liquid M is scraped up by the rotation of the bar 12, but when the cross-sectional area S of the liquid pool portion 17 is 20 mm ² full, the scraping amount of the coating liquid M> the supply amount of the coating liquid M, and the liquid runs out failure ( Failure due to thin coating caused by insufficient supply of liquid) occurs. Further, when the cross-sectional area S of the liquid pool portion 17 exceeds 100 mm ² , the internal pressure of the coating liquid becomes small, and the liquid pressure loses to the air pressure accompanied by the substrate 30, causing a repellent failure (carried by the web). Failure due to thin coating caused by air) occurs.

In the coating device 10, it is preferable that the plurality of weir plates 16 can change the capacity of the liquid pool portion 17. That is, it is preferable that the cross-sectional area S of the liquid pool portion 17 described above can be changed.
The plurality of weir plates 16 can each move with respect to the traveling direction D1 of the substrate 30, and the distance between the bar 12 and the weir plate 16 in the traveling direction D1 can be changed. In this case, for example, the weir plate 16 and the main body block 14 are fixed with bolts (not shown), and the bolts are tightened or loosened to reduce the distance between the bar 12 and the weir plate 16 in the traveling direction D1. The configuration will be changed.

It is preferable that the distance B, which is the shortest distance between the end surface 12a on the upstream side of the traveling direction D1 of the bar 12 and the weir plate 16, is 0.05 mm or more and 2 mm or less.
When the distance B between the end surface 12a on the upstream side of the traveling direction D1 of the bar 12 and the weir plate 16 is less than 0.05 mm, the coating liquid M is uniformly distributed in the width direction D2 from the slit 15 between the bar 12 and the weir plate 16. Not supplied.
On the other hand, if the distance B from the weir plate 16 exceeds 2 mm or less, it becomes difficult to increase the internal pressure of the coating liquid M, and air-accompanied cissing is likely to occur. More preferably, the distance B between the end surface 12a on the upstream side in the traveling direction D1 of the bar 12 and the weir plate 16 is 0.1 mm or more and 1 mm or less.

Further, it is preferable that the distance A between the weir plate 16 and the long substrate 30 is 0.2 mm or more and 2 mm or less.
If the distance A between the dam plate 16 and the long substrate 30 is less than 0.2 mm, the coating liquid M flowing to the upstream side in the traveling direction D1 disappears, and the coating liquid M tends to run out.
On the other hand, if the distance A between the weir plate 16 and the long substrate 30 exceeds 2 mm, it becomes difficult to increase the internal pressure of the coating liquid M, and air-accompanied cissing is likely to occur. More preferably, the distance A between the weir plate 16 and the long substrate 30 is 0.4 mm or more and 1 mm or less.
Further, the distance A between the weir plate 16 and the long substrate 30 is the length between the lowermost portion of the weir plate 16 and the uppermost portion of the substrate 30, and is the shortest distance between the weir plate 16 and the substrate 30. It is the distance. In the configuration of FIG. 2, it is the shortest distance between the end surface 16c of the weir plate 16 and the upper surface 30a of the substrate 30.

(Applying method)
Next, the coating method of the coating device 10 will be described.
The coating liquid M is supplied from the supply unit 22 to the weir plate 16 via the supply pipe 20, and the slit 15 is filled with the coating liquid M via the liquid feeding storage unit 24. Then, the bar 12 is rotated. The substrate 30 is continuously traveled in the traveling direction D1 at a specific traveling speed, and the bar 12 is brought into contact with the upper surface 30a of the continuously traveling substrate 30 via the coating liquid M for each weir plate 16 to reach the upper surface 30a of the substrate 30. , The coating liquid M corresponding to each weir plate 16 is applied, and three kinds of coating liquid M are simultaneously applied in a striped pattern on one bar 12. Moreover, each pattern can be applied without being mixed. As a result, with one bar 12, three coating films 32a, 32b, and 32c different in the width direction D2 can be simultaneously formed into a striped pattern on the substrate 30 with a gap 33. In this case, the coating films 32a, 32b, and 32c can be formed without mixing the coating liquids with each other.

Although the coating method of the coating device 10 has been described for coating on the upper surface 30a of the substrate 30, it can also be applied to the lateral surface of the substrate 30 as described above. The lower surface 30b of the substrate 30 can also be coated as described above.

In the coating device 10, three types of coating liquids M are simultaneously applied in a striped pattern on one bar 12 to form three coating films 32a, 32b, 32c arranged in the width direction D2 of the substrate 30 in a striped shape. be able to. As a result, it is possible to produce a product in which samples having different functions are arranged in the width direction D2 of the substrate 30. In this case, the sample bonding step becomes unnecessary, and the manufacturing cost of a product in which samples having different functions are arranged in the width direction D2 can be reduced.
Further, when the stretching step of stretching the resin substrate 30 in the width direction D2 is performed, the substrate outside the product width is coated with, for example, a liquid containing no impurities as a coating liquid in a region outside the product width. 30 can be recovered, and it is possible to prevent the substrate 30 outside the product width from being wasted. As a result, it is possible to suppress a decrease in the profit rate and improve productivity.
Moreover, since the weir plate 16 of the coating device 10 increases the internal pressure of the coating liquid M, the ingress of air from the upstream side is suppressed, and the air-accompanied repellent is suppressed.
Further, the liquid feeding storage unit 24 is provided, so that the generation of foam repellent is suppressed, and the coating liquid M can be uniformly applied to the width direction D2 of the substrate 30. Moreover, the occurrence of liquid shortage can be suppressed.

(Second example of coating device)
Next, a second example of the coating apparatus will be described.
FIG. 3 is a schematic perspective view showing a second example of the coating device according to the embodiment of the present invention.
In the coating device 10 shown in FIG. 3, the same components as those of the coating device 10 shown in FIGS. 1 and 2 are designated by the same reference numerals, and detailed description thereof will be omitted.

The coating device 11 shown in FIG. 3 has a different interval δ between the weir plates 16 as compared with the coating device 10 shown in FIG. 1, and the weir plates 16 can be moved in the longitudinal method of the bar 12, that is, in the width direction D2. The other points are the same as those of the coating apparatus 10 shown in FIG. 1, and the detailed description thereof will be omitted. The coating device 11 shown in FIG. 3 can obtain the effect of the coating device 10 shown in FIG.

Like the coating device 11, it is preferable that each of the plurality of weir plates 16 can change the position of the bar 12 in the longitudinal method, that is, the position in the width direction D2. As a result, the formation position of the coating films 32a, 32b, 32c in the width direction D2 of the substrate 30 can be changed, and the interval of the gap 33 between the coating films 32a, 32b and the interval 33 of the gap 33 between the coating films 32b, 32c. Can be changed. This makes it possible to change the position of the striped pattern formed by the three coating films 32a, 32b, and 32c in the width direction.
Further, even when the width of the substrate 30 is changed, the width of the substrate 30 can be accommodated by changing the position of the weir plate 16 in the width direction D2. For example, when the width of the substrate 30 is narrowed, the gap 27 between the weir plates 16 on both sides and the weir plate 16 in the center is narrowed. When the width of the substrate 30 is widened, the gap 27 between the weir plates 16 on both sides and the weir plate 16 in the center is widened.
When changing the position of the weir plate 16 in the width direction D2, for example, when the main body block 14 has a divided block structure, the weir plate 16 moves in the width direction D2 together with the main body block 14.
Further, when the main body block 14 has a single block structure, only the weir plate 16 moves in the width direction D2.
When changing the position of the weir plate 16 in the width direction D2, for example, a long hole (not shown) extending in the width direction D2 is provided in the weir plate 16 so that the weir plate 16 can be moved in the width direction D2. The weir plate 16 is fixed using, for example, bolts (not shown).

(Third example of coating device)
FIG. 4 is a schematic perspective view showing a third example of the coating device according to the embodiment of the present invention, and FIG. 5 is a schematic side view showing a third example of the coating device according to the embodiment of the present invention.
In the coating apparatus 10 shown in FIGS. 4 and 5, the same components as those of the coating apparatus 10 shown in FIGS. 1 and 2 are designated by the same reference numerals, and detailed description thereof will be omitted.
The coating device 11a shown in FIG. 4 is different from the coating device 10 shown in FIG. 1 in that the interval δ of the weir plates 16 is different and that it has the side plates 26, and the other configurations are the coating shown in FIG. Since it is the same as the device 10, the detailed description thereof will be omitted. The coating device 11a shown in FIGS. 4 and 5 can obtain the effect of the coating device 10 shown in FIG.

In the coating device 11a, the plurality of weir plates 16 are provided with side plates 26 at both ends in the longitudinal direction of the bar 12, respectively. That is, each of the plurality of weir plates 16 is provided with side plates 26 at the ends 25 on both sides of the bar 12 in the width direction D2.
The side plate 26 shown in FIG. 5 covers the end portion 25 so that the coating liquid M does not flow from the end portion 25, and the shape thereof is not particularly limited to the shape shown in FIG. For example, the side plate 26 is configured so as not to come into contact with the substrate 30, and the upper side 26a of the side plate 26 on the upper surface 30a side of the substrate 30 faces the end surface 16c from the position where the bar 12 and the substrate 30 are closest to each other and is the upper surface of the substrate 30. It is inclined so that the distance from 30a increases.

By providing the side plate 26, the utilization efficiency of the coating liquid M can be improved. On the other hand, without the side plate 26, there is a coating liquid M flowing out from the end portion 25, and the amount of the coating liquid M required for coating increases.
Further, if the side plate 26 is not provided, the coating liquid M will flow to the end portion 25, and the coating liquid M is likely to run out. Therefore, the amount of the coating liquid M to be uniformly applied increases. As the amount of the coating liquid M sent increases, the flow velocity of the coating liquid M in the liquid pool portion 17 between the weir plate 16 and the bar 12 increases, and it becomes easy to mix with the coating liquid M of the adjacent weir plate 16.
The material of the side plate 26 is not particularly limited, and a material suitable for the coating liquid M is appropriately selected. The side plate 26 is made of, for example, a metal such as SUS (Steel Use Stainless) or a resin.

The side plates 26 are not limited to being provided at the end portions 25 in the width direction of all the weir plates 16. At the outer end 25 of the weir plates 16 on both sides in the width direction D2, even if the coating liquid M flows, it does not mix with the coating liquid M of the adjacent weir plate 16, so that the weir plates 16 are adjacent to each other. A side plate 26 may be provided at the longitudinal end 25 of the bar 12 of the weir plate 16 facing between the weir plates 16. That is, the side plate 26 may be provided only at the end portion 25 in the gap 27 of the weir plate 16.
Further, the coating device 11a may have a configuration in which the weir plate 16 can be moved in the width direction D2, similarly to the coating device 11 shown in FIG.
It should be noted that any of the above-mentioned coating devices 10, 11 and 11a has a configuration in which the liquid feed storage unit 24 is provided, but the present invention is not limited to this, and a configuration in which the liquid feed storage unit 24 is not provided may be used. In this case, since bubbles brought in from the liquid feeding system or the like are accumulated in the air retention portion (not shown), the effect of suppressing foam repelling is small.

Next, the coating system will be described.
(Applying system)
FIG. 6 is a schematic view showing a first example of the coating system of the embodiment of the present invention, and FIG. 7 is a schematic diagram showing a second example of the coating system of the embodiment of the present invention.
In the coating system 40 shown in FIGS. 6 and 7, the same components as those of the coating apparatus 10 shown in FIGS. 1 and 2 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the coating system 40, the coating devices 10 described above are arranged so as to face each other with the substrate 30 interposed therebetween, and the coating liquid is simultaneously applied to both surfaces of the substrate 30 in a pattern. The rotation center Cr of the coating device 10 is arranged so as to be displaced from the position in the traveling direction D1.
In the coating system 40, a plurality of coating liquids can be simultaneously applied in a striped pattern on both surfaces of the substrate 30.
The coating system 40 has one drying portion 42. The structure of the drying portion 42 is not particularly limited, and is, for example, one that is dried by warm air.
The drying portion 42 dries the coating liquid in which the striped pattern is applied on both surfaces of the substrate 30, and a plurality of coating films are formed.
Simultaneous application system 40 means that the time is not the same, but one process.
In the coating system 40, a plurality of coating liquids are simultaneously applied in a striped pattern on both surfaces of one substrate 30, dried by one drying portion 42, and a plurality of striped coatings are applied on both surfaces of one substrate 30. A film can be formed. On the other hand, in the above-mentioned reverse coating method, simultaneous coating on the upper surface and the lower surface of the web is not possible. Therefore, when providing a drying portion, it is necessary to provide two drying portions, which requires a lot of capital investment. It is necessary and causes the equipment to become large. As described above, in the coating system 40, only one drying unit 42 is required, a large amount of capital investment such as drying equipment is not required, the equipment can be constructed at low cost, and the size of the equipment can be suppressed.

The arrangement of the coating device 10 of the coating system 40 is not limited to the arrangement shown in FIG. 6, and may be the arrangement shown in FIG. The coating system 40 shown in FIG. 7 has a configuration in which the coating device 10 of the coating system 40 shown in FIG. 6 is rotated in the height direction D3 so that the upper surface 30a of the substrate 30 is turned sideways.
The coating system 40 is not limited to the coating device 10 described above, and the coating device 11 and the coating device 11a described above can also be used.

Next, the substrate 30 and the coating liquid M used in the above-mentioned coating devices 10, 11, 11a and the coating system 40 will be described.

(substrate)
Examples of the substrate include glass material, metal material, alloy material, paper, plastic film, resin coated paper, synthetic paper, cloth and the like. Examples of the material of the plastic film include polyolefins such as polyethylene and polypropylene, vinyl polymers such as polyvinyl acetate, polyvinyl chloride and polystyrene, polyamides such as 6,6-nylon and 6-nylon, polyethylene terephthalate and polyethylene-2. , 6-Polyester such as naphthalate, polycarbonate, cellulose triacetate, cellulose acetate such as cellulose diacetate and the like. Further, as the resin used for the resin coated paper, polyolefins such as polyethylene can be exemplified as a typical example.

The thickness of the substrate is not particularly limited, but those having a thickness of 0.01 to 1.5 mm are preferably used from the viewpoint of handling and versatility.

The substrate comes into contact with the bar under tension via the coating liquid. The angle formed by the substrate and the horizontal plane is preferably 0 ° to 10 °, more preferably 0 ° to 5 ° on both the upstream side and the downstream side of the bar. By setting the angle of the substrate within the above range, the coated surface can be made uniform and the wear of the bar can be suppressed.
The form of the substrate is not particularly limited, and examples thereof include a sheet shape and a continuous strip shape. A continuous strip-shaped substrate, that is, a long substrate is called a web.

(Coating liquid)
The coating liquid refers to various liquid substances.
In the coating solution, the solvent is, for example, water and an organic solvent. The organic solvent is, for example, methyl ethyl ketone (MEK), methyl propylene glycol (MFG), methanol and the like.
Binders include polymers or monomers such as polyurethane, polyester, polyolefin, acrylic, polyvinyl alcohol (PVA) and the like. Further, the coating liquid may contain, for example, silicon oxide particles and titanium oxide particles as solid content.
The viscosity of the coating liquid is 7 × 10 ^{-4 to} 0.4 Pa · s (0.7 to 400 cP (centipores)), and the coating amount is 0.1 to 200 ml (milliliter) / m ² (1 to 200 cc / m ² ). , The coating speed can be applied at 1 to 400 m / min.
Preferably, the viscosity is 1 × 10 ^{-3 to} 0.1 Pa · s (1 to 100 cP), the coating amount is 1 to 100 ml / m ² (1 to 100 cc / m ² ), and the coating rate is 1 to 200 m. / Minute.

In addition to the above-mentioned coating solutions, examples of the coating solution include solutions used for coating on a substrate and drying to form a film. Specifically, in addition to the photosensitive layer forming liquid and the heat sensitive layer forming liquid, the intermediate layer forming liquid that forms an intermediate layer on the surface of the substrate to improve the adhesion of the plate making layer, and protects the plate making surface of the plate printing original plate from oxidation. Polyvinyl alcohol aqueous solution, colloidal solution of photosensitive agent for photographic film used to form a photosensitive layer in photographic film, colloidal solution of photosensitive agent for photographic paper used to form a photosensitive layer of photographic paper, recording tape, video tape. , And the magnetic layer forming liquid used for forming the magnetic layer of the floppy disk, and various paints used for coating metal.

(Use)
The coating device and coating method can be applied to all fields in which a liquid film is applied to metal, paper, cloth, film or the like using a bar to manufacture a product, and the application is not particularly limited.
Applications of the coating device and coating method include, for example, the production of photosensitive materials such as photographic film, the production of magnetic recording materials such as recording tapes, and the production of coated metal thin plates such as colored iron plates. Can be used if. Therefore, as the substrate, in addition to the support substrate described in the section of the prior art, a lithographic printing original plate substrate having a photosensitive or heat-sensitive plate-making surface formed on the sharpened side surface of the support substrate, and a base material for photographic film. , Barrier paper for photographic paper, base material for recording tape, base material for video tape, base material for floppy (registered trademark) disc, etc., made of metal, plastic, paper, etc., and has a continuous strip shape and flexibility. Examples thereof include a base material having a base material.
In addition to the above-mentioned coating solutions, examples thereof include solutions used for coating on a substrate and drying to form a film, and specifically, a photosensitive layer forming solution and a heat sensitive layer forming solution. In addition, to form an intermediate layer forming solution that forms an intermediate layer on the surface of the substrate to improve the adhesion of the plate making layer, a polyvinyl alcohol aqueous solution that protects the plate making surface of the plate printing original substrate from oxidation, and a photosensitive layer in a photographic film. Photosensitizer colloid solution for photographic film used, photographic paper photosensitive colloid solution used to form the photosensitive layer of photographic paper, used to form the magnetic layer of recording tape, video tape, floppy disk Examples include colloidal layer forming solutions and various paints used for coating metals.

Further, by using the coating device and the coating method, it is possible to efficiently form the coated surfaces on both surfaces of the substrate. Conventionally, when forming a uniform coating film, a bottom surface coating device is often used. In this case, after providing the first bottom surface coating step, the transfer direction is changed by the substrate transfer roll, and the second surface is again applied. It was necessary to provide the bottom surface coating step of 2. For this reason, the transport distance until the coating surfaces are formed on both sides is long, and a wide coating space for the coating liquid is required.
However, by using the coating device and the coating method, it has become possible to form a uniform coating film even in the top coating. Therefore, when the coating surfaces are formed on both sides of the substrate, the conventional bottom surface coating and the top surface coating using the above-mentioned coating device can be performed at the same time, and the coating space can be saved. As a result, the film forming process can be simplified and the manufacturing cost can be suppressed.

The present invention is basically configured as described above. Although the coating apparatus and coating system of the present invention have been described in detail above, the present invention is not limited to the above-described embodiment, and various improvements or modifications may be made without departing from the gist of the present invention. Of course.

The features of the present invention will be described in more detail with reference to Examples below. The materials, reagents, amounts of substances and their ratios, operations, etc. shown in the following examples can be appropriately changed as long as they do not deviate from the gist of the present invention. Therefore, the scope of the present invention is not limited to the following examples.
In this example, the coating liquid was applied to the substrate using the coating devices of Examples 1 to 13 and Comparative Example 1, and the pattern coating property, liquid mixing, liquid drainage, and repelling were evaluated.

The coating device had a bar diameter of 10 mm and a width of 800 mm. The bar rotation speed was set to 1500 rotations / minute (rpm). The coating was carried out so that the primary side substrate approach angle was 3 ° and the film thickness of the stationary portion was 5 μm. The primary side substrate approach angle is an angle at which the substrate enters from the upstream side of the bar. The traveling speed of the substrate was set to 120 m / min.
A polyethylene terephthalate (PET) film having a width of 700 mm was used as the substrate.
As the coating liquid, a polyester resin, a cross-linking agent, and a surfactant prepared by dissolving in water were used. The amount of the composition of the coating liquid was adjusted so that the viscosity was 2 mPa · s. The surface tension of the coating liquid was 40 mN / m.

Next, the evaluation items such as pattern coatability, liquid mixing, liquid drainage, and repellent will be described. In each evaluation item of pattern coatability, liquid drainage, and repellent, visual observation was performed, and the visual observation time was 1 minute per sample.

(Pattern coatability)
The pattern coatability was evaluated by visually observing the coating film and using the pattern coatability evaluation criteria shown below. The results are shown in Table 1 below.
Pattern coating evaluation criteria A: Pattern coating is possible B: Pattern coating is not possible

(Mixed liquid)
For mixing of the liquids, the coating liquid after coating was recovered, and after recovery, the recovered liquid was applied to obtain a coating film. The components of this coating film were identified by fluorescent X-ray (XRF) measurements.
The mixture of liquids was evaluated based on the results of the specified components according to the following evaluation criteria of liquid mixture. The results are shown in Table 1 below.
Liquid mixture evaluation criteria A: Contamination rate 0%
B: Contamination rate more than 0% and less than 20% C: Contamination rate 20% or more

(Out of liquid)
For liquid drainage, the coating film was visually observed, and after visual evaluation, elemental analysis was performed on the faulty part with an electron probe microanalyzer (EPMA).
The liquid drainage was evaluated by the following liquid mixture evaluation criteria based on the results of elemental analysis. The results are shown in Table 1 below.
Liquid drainage evaluation criteria A: Contains 100% of specific elements B: Contains 80% or more and less than 100% of specific elements C: Contains less than 80% of specific elements

(Hajiki)
Hajiki visually observed the coating film, and after visual evaluation, performed elemental analysis of the failed portion with an electron probe microanalyzer (EPMA).
Hajiki was evaluated according to the following Hajiki evaluation criteria based on the results of elemental analysis. The results are shown in Table 1 below.
Repellent Evaluation Criteria A: Contains 100% of specific elements B: Contains 80% or more and less than 100% of specific elements C: Contains less than 80% of specific elements

Hereinafter, Examples 1 to 13 and Comparative Example 1 will be described. In Table 1 below, "-" in the application condition column indicates that there is no applicable item.
(Example 1)
In Example 1, the number of weir plates was set to 2 in the configuration of the coating apparatus shown in FIGS. 1 and 2. The width of the first weir plate was 100 mm, the width of the second weir plate was 300 mm, and the distance δ between the first weir plate and the second weir plate was 1 mm.
The liquid feed rate of the first weir plate was set to 100 cc / min, and the liquid feed rate of the second weir plate was set to 300 cc / min. Further, the cross-sectional area S of the liquid pool portion was set to 10 mm ² . In the first embodiment, the side plate is not provided.
(Example 2)
In the second embodiment, the coating apparatus shown in FIGS. 1 and 2 is configured, and the number of weir plates is 3. The width of the first weir plate was 100 mm, the width of the second weir plate was 300 mm, the width of the third weir plate was 100 mm, and the interval δ of the weir plates was 1 mm.
The liquid feed amount of the first weir plate was 100 cc / min, the liquid feed amount of the second weir plate was 300 cc / min, and the liquid feed amount of the third weir plate was 100 cc / min. Further, the cross-sectional area S of the liquid pool portion was set to 10 mm ² . In the second embodiment, the side plate is not provided.

(Example 3)
Example 3 is different from the second embodiment, the cross-sectional area S of the liquid reservoir portion except a 120 mm ² were the same as in Example 2.
(Example 4)
Example 4 is different from the second embodiment, the cross-sectional area S of the liquid reservoir portion except a 100 mm ² were the same as in Example 2.
(Example 5)
Example 5 is different from the second embodiment, the cross-sectional area S of the liquid reservoir has a except a 20 mm ² same as Example 2.
(Example 6)
Example 6 is different from the second embodiment, the cross-sectional area S of the liquid reservoir portion except a 30 mm ² were the same as in Example 2.
(Example 7)
Example 7 is different from the second embodiment, the cross-sectional area S of the liquid reservoir portion except a 50 mm ² were the same as in Example 2.

(Example 8)
Example 8 is different from the embodiment 2, a point spacing of the sheathing board δ is 3 mm, and the cross-sectional area S of the liquid reservoir portion except a 50 mm ² were the same as in Example 2.
(Example 9)
Example 9 is the same as Example 2 except that the interval δ of the weir plates is 3 mm, the cross-sectional area S of the liquid pool portion is 50 mm ² , and the side plate is provided, as compared with Example 2. And said.
(Example 10)
Example 10 is different from the embodiment 2, a point spacing of the sheathing board δ is 5 mm, and the cross-sectional area S of the liquid reservoir portion except a 50 mm ² were the same as in Example 2.
(Example 11)
Example 11 is the same as Example 2 except that the distance δ of the weir plates is 5 mm, the cross-sectional area S of the liquid pool portion is 50 mm ² , and the side plate is provided, as compared with Example 2. And said.
(Example 12)
Compared to Example 2, Example 12 has a point that the interval δ of the weir plates is 5 mm, a point that the amount of liquid sent is different, a point that the cross-sectional area S of the liquid pool portion is 50 mm ² , and a point that the side plate is provided. Other than that, it was the same as in Example 2.
In Example 12, the liquid feed amount of the first weir plate was 70 cc / min, the liquid feed amount of the second weir plate was 220 cc / min, and the liquid feed amount of the third weir plate was 70 cc / min. ..
(Example 13)
Compared with Example 12, Example 13 was the same as Example 12 except that there was no side plate.

(Comparative Example 1)
In Comparative Example 1, in the configuration of the coating apparatus shown in FIGS. 1 and 2, the number of weir plates is 1, and there is only a configuration corresponding to the second weir plate of Example 1. In Comparative Example 1, the liquid feeding amount was set to 300 cc / min, and the cross-sectional area S of the liquid pool portion was set to 10 mm ² . In Comparative Example 1, since only one coating film is formed, the liquids do not mix. Therefore, "-" is written in the column of the evaluation result of the mixture of liquids.

As shown in Table 1, in Examples 1 to 13, two or more kinds of coating liquids could be simultaneously applied in a striped pattern. In Comparative Example 1, the weir plate was configured as one, and two or more kinds of coating liquids could not be simultaneously applied in a striped pattern.
In Examples 1 and 2, the cross-sectional area S of the liquid pool portion was small and the liquid ran out. Further, in Examples 1 and 2, the interval δ of the weir plates was narrow and the liquids were mixed.
In Example 3, the cross-sectional area S of the liquid pool portion was too large to cause repelling, and the interval δ of the dam plates was narrow, resulting in liquid mixing.
In Example 4, the cross-sectional area S of the liquid pool portion was the upper limit of the preferable range, some repelling was generated, and the interval δ of the weir plates was narrow, and the liquid was mixed.
In Example 5, the cross-sectional area S of the liquid pool portion was the lower limit of the preferable range, the liquid was slightly drained, the interval δ of the dam plates was narrow, and the liquid was mixed.
In Examples 6 and 7, the cross-sectional area S of the liquid pool portion was in a preferable range, and good results were obtained for liquid drainage and repelling. Further, in Examples 6 and 7, the interval δ of the weir plates was narrow and the liquids were mixed.
In Example 8, the interval δ of the weir plates was the lower limit of the preferable range, and better results could be obtained than in Example 7 in terms of liquid mixing. In Example 9, the interval δ of the weir plates was the lower limit of the preferable range and the side plates were provided, and even better results could be obtained with respect to the mixing of the liquids than in Example 8.

In Example 10, the interval δ of the weir plates was in a preferable range, and even better results could be obtained for the mixing of the liquids.
In Example 11, the interval δ of the weir plates was in a preferable range and the side plates were provided, and even better results could be obtained for the mixing of the liquids.
In Example 12, the interval δ of the weir plates is in a preferable range and the side plates are provided, and good results can be obtained for liquid mixing, liquid drainage, and repellent even if the amount of liquid to be fed is small. Was made. As a result, the loss of the coating liquid can be reduced.
In Example 13, the interval δ of the weir plates was in a preferable range, and when the amount of liquid to be fed was reduced, good results could not be obtained for liquid drainage because there was no side plate.
When a coating system was constructed using the coating apparatus of Example 9 and simultaneously coated on both sides of the substrate, good results could be obtained for liquid mixing, liquid drainage, and repelling.

10, 11, 11a Coating device 12 bar 12a End face 14 Main body block 15 Slit 16 Weir plate 16a Protruding part 16b Side surface 16c End face 17 Liquid pool part 20 Supply pipe 22 Supply part 24 Liquid supply storage part 25 End part 26 Side plate 27 Gap 30 Substrate 30a Upper surface 30b Lower surface 32a, 32b, 32c Coating film 33 Gap 40 Coating system 42 Drying part A Distance B Distance Cr Rotation center D1 Traveling direction D2 Width direction D3 Height direction M Coating liquid PL plane δ Interval S Cross-sectional area

Claims (10)

A long bar extending in a width direction orthogonal to the running direction, which rotates in contact with at least one surface of a long substrate running continuously in a specific running direction via a coating liquid.
A coating device having a weir plate provided upstream of the traveling direction of the substrate with respect to the bar and allowing the coating liquid to flow in the traveling direction of the substrate through the bar.
It has a body block that rotatably supports the bar.
A plurality of weir plates arranged along the longitudinal direction of the bar,
A coating device provided for each weir plate and having a plurality of supply units for supplying the coating liquid to the weir plate. The coating device according to claim 1, wherein the distance between the dam plates in the longitudinal direction of the bar is 3 mm or more. The coating device according to claim 1 or 2, wherein the plurality of weir plates can be repositioned in the longitudinal direction of the bar, respectively. Each of the plurality of weir plates has a liquid pool portion between the weir plate and the bar.
The coating device according to any one of claims 1 to 3, wherein the plurality of weir plates can each change the capacity of the liquid pool portion. The coating device according to claim 4, wherein each of the plurality of weir plates is movable with respect to the traveling direction of the substrate, and the distance between the bar and the weir plate in the traveling direction can be changed. The cross-sectional area S of the liquid pool portion in the plane composed of the traveling direction and the height direction orthogonal to the traveling direction is 20 mm ² or more and 100 mm ² or less.
The cross-sectional area S of the liquid pool portion is a peripheral surface on the plane on the upstream side of the bar in the traveling direction.
A line passing through the center of rotation of the bar and the shortest distance between the end face of the bar on the upstream side in the traveling direction and the weir plate,
A line that passes through the intersection of the line passing through the shortest distance and the weir plate and is perpendicular to the surface of the substrate.
The coating device according to claim 4, which is the area of the portion surrounded by the substrate. The coating device according to any one of claims 1 to 6, wherein the plurality of weir plates are provided with side plates at both ends of the bar in the longitudinal direction. The invention according to any one of claims 1 to 6, wherein a side plate is provided at the longitudinal end of the bar of the weir plate facing between adjacent weir plates among the plurality of weir plates. Coating device. The coating device according to any one of claims 1 to 8, wherein the liquid feeding storage unit for storing the coating liquid is provided in the main body block or each weir plate. The coating apparatus according to any one of claims 1 to 9 is arranged so as to face each other with a substrate interposed therebetween.
A coating system in which a coating liquid is simultaneously applied to both surfaces of the substrate in a pattern.