JP2002239436A - Coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lip type coating apparatus capable of applying to give a uniform thickness of a coating film in the width direction even in the case the coating width is increased. SOLUTION: In the lip type coating apparatus, the flatness of the inside surface of a lip in a land part 8 is controlled to <=0.01 mm, the shortest distance L1 from each connection means 5 to a manifold 7 upper end is controlled to 2-20 mm and each connection means 5 is arranged in an area of an opening angle ranging ±3 deg. to a line segment drawn parallel to the manifold upper and passing the center of the connection means positioned at the center-most in the lip longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for coating a coating liquid on a web or the like in a film form, and more particularly, to coating a coating film having a uniform thickness in the width direction even when the coating width is increased. The present invention relates to a lip-type coating device which enables the application.

[0002]

2. Description of the Related Art FIG. 9 shows a conventional lip type coating apparatus 81.
Is disassembled and shown, two horizontally long lips 82, 83
A thin spacer 84 is interposed between the bolts 8
5 and are integrally fastened and fixed. On one inner surface of the two integrated lips 82, 83, a manifold 87 is provided which is inclined in a mountain shape on both left and right sides with respect to the application liquid supply port 86, and a land portion 88 from the lower edge of the manifold 87. Through a discharge port 89 which opens in a slit shape at the lower ends of the lips 82 and 83. When a material to be coated (not shown) such as a web is run outside the discharge port 89, the coating liquid discharged from the discharge port 89 is applied as a thin film on the surface of the material to be coated. ing.

When a coating liquid is applied to the surface of a material to be coated by the above-described coating apparatus, productivity can be improved as the width of the material to be coated is increased. However, as the width of the material to be coated increases, that is, as the width of the coating film increases, it becomes more difficult to make the film thickness uniform over the entire width direction. The thickness of a coating film can be formed to a uniform thickness with a conventional device only when the coating film width is about 600 mm, and 800 mm or more.
In particular, when it was enlarged to 1000 mm or more, it was almost impossible to form a uniform coating film.

That is, the slit length of the discharge port 89 is 80
10 mm or more, especially 1000 mm or more, FIG.
As shown in (A), a deformation occurs in which the slit width G of the discharge port 89 becomes the minimum width G _{min at} the center and the maximum width G _max at both ends. As a result, as shown in FIG. 10B, the thickness T of the coating film formed on the material to be coated becomes the minimum thickness T _min at the center in the width direction and the maximum thickness T _max at both ends. Thickness unevenness.

According to the results of various studies conducted by the present inventors on the cause of the above-mentioned uneven thickness, the lip 8
Since the plate portions of the spacers 84 are supported at both ends in the longitudinal direction of the spacers 2 and 83, the deflection of the discharge port 89 caused by the tightening of the bolts 85 is small, but the spacers 84 are centrally located.
Is notched, the deflection becomes large, which causes the slit width G to become the minimum width _Gmin at the center.

Conventionally, as a general method of correcting the slit width as described above, the distribution of the longitudinal width of the slit is adjusted by individually adjusting the deflection of the tip of the lip with a large number of push-pull bolts. It was that. However, the longer the slit length, the larger the number of bolts, so that a skilled technique and a large amount of time are required for adjustment, and the operating rate is significantly reduced.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a lip-type coating apparatus which can uniformly form a coating film in the width direction even when the coating width is increased. It is in.

[0008]

According to a first aspect of the present invention, there is provided a coating apparatus comprising: a plurality of horizontally extending lips formed of a plurality of lips so as to form a slit-like discharge port between edges; In a coating device fixed by the connecting means and provided with a manifold for guiding the coating liquid in the longitudinal direction on at least one lip inner surface, and a narrow land portion communicating between the manifold and the discharge port, at least the land portion The flatness of the inner surface of the lip is set to 0.01 mm or less, and the shortest distance L ₁ from each connecting means to the upper edge of the manifold is set to 2
２０20 mm, and each of the connecting means is arranged within a range of ± 3 ° of an angle of a line drawn in parallel with the upper edge of the manifold through the center of the connecting means located at the center of the lip in the longitudinal direction. It is characterized by the following.

Another device (second invention) of the present invention is such that two horizontally long lips are fixed by a plurality of connecting means so as to form a slit-like discharge port between the edges, and at least one of the lips is formed. In the coating device provided with a manifold for guiding the coating liquid in the longitudinal direction on the inner surface, and communicating between the manifold and the discharge port with a narrow land portion, at least the flatness of the lip inner surface in the land portion is 0.01 mm or less. And the shortest distance L1 from each of the connecting means to the upper edge of the manifold is set to ₂ to 20 mm, and along a lip longitudinal direction in a region from each of the connecting means to the land on at least one outer surface of the lip. A slit is provided.

[0010] Still another device (third invention) of the present invention is:
The two horizontally long lips are fixed with a plurality of connecting means so as to form a slit-shaped discharge port between the edges, and a manifold for guiding the coating solution in the longitudinal direction is provided on at least one lip inner surface, and the manifold is provided with the manifold. In a coating device communicating with the discharge port through a narrow land portion, at least the flatness of the inner surface of the lip in the land portion is 0.01 mm.
In the following, the plurality of connecting means are linearly arranged in the lip longitudinal direction such that the shortest distance L1 from each connecting means to the upper edge of the manifold is in the range of ₂ to 20 mm, and the center of the lip longitudinal direction is A plurality of additional connecting means are additionally arranged in a row at a position farther from the manifold than the connecting means.

In any of the first to third inventions described above, the flatness of the inner surface of the lip at the land portion is set to 0.01.
mm, preferably 0.004 mm or less, so that the lip gap accuracy in the land is improved, and the flow resistance of the coating liquid passing through the land is evenly distributed over the entire slit longitudinal direction of the discharge port. Can be done.

The shortest distance L ₁ from each connecting means to the upper edge of the manifold is in the range of ₂ to 20 mm, preferably 5 to 20 mm.
１５15 mm, and in the case of the first invention,
By arranging each connecting means in a range of an opening angle of ± 3 ° with respect to a line drawn in parallel with the upper edge of the manifold through the center of the connecting means located at the center of the lip longitudinal direction,
The lip is less likely to be distorted and the assembling accuracy can be improved, and the gap between the lips at the discharge port and the land can be made uniform in the longitudinal direction without special skill.

In the case of the second invention, at least one of the lips is provided with a notch slit along the longitudinal direction of the lip in a region from each connecting means to the land portion in a region from the connecting means to the land portion, so that the lips can be connected to each other. The strain caused by the close contact is reduced, and the lip gap is made uniform in the longitudinal direction.

Further, in the case of the third invention, another plurality of connecting means are arranged at a position farther from the manifold than the connecting means at the center of the arrangement of each connecting means linearly arranged in the longitudinal direction of the lip. With the additional arrangement, the magnitude of the distortion can be adjusted in the longitudinal direction, and the lip gap can be made uniform in the longitudinal direction.

As a result, in any of the first to third inventions, even when the coating width is increased, the coating thickness of the coating liquid can be made uniform throughout the width.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the coating liquid used for forming a coating film is not particularly limited as long as it is a liquid having fluidity. Examples thereof include a coating liquid for coloring, a resist, and a surface protection liquid. A coating solution for forming an antistatic layer, a coating solution for forming a photosensitive layer or a magnetic layer, or a coating solution for slipping. Finely dispersed ones are often used.

The member to be coated may be either a continuous form or a single-wafer form. In the case of a continuous form, a web-like material such as a resin film, a metal foil such as aluminum can be mentioned, and in the case of a single-sheet form, a glass substrate, a metal plate and the like can be mentioned.

In the present invention, the coating member refers to a member on which a coating film is formed on the surface of a member to be coated. As an example,
Examples include electronic information members such as a base film for a recording medium, a printing plate material, an optical filter, a color filter for a color liquid crystal display, and a back plate for a plasma display.

The shape of the member to be coated is not particularly limited as long as it is in the form of a sheet. For example, in a continuous form, a web such as a resin film, a metal foil such as an aluminum foil, and the like can be given. In a single-wafer form, a glass substrate, a metal plate, or the like can be given.

FIG. 1 is an exploded perspective view showing the coating apparatus of the present invention, FIG. 2 is a longitudinal sectional view after assembling, and FIG. 3 is a perspective view showing the inner surface of one lip constituting the coating apparatus.

As shown in these figures, the coating apparatus 1
Two horizontal doctor lip 2 and backup lip 3
, A thin spacer 4 is interposed therebetween, and these three members are integrally fixed with a plurality of bolts 5 as connecting means. The spacer 4 has a shape in which the lower half is cut out, leaving both end portions and an upper edge portion. The thickness of the spacer 4 reduces the slit width (lip gap) of the discharge port 9 opened at the lower end of both lips 2 and 3. Has a function to determine. Although the spacer 4 is configured as a member independent of the lips 2 and 3 in the illustrated example, the spacer 4 is not necessarily required to be an independent member as long as it has the above function. One of them may be integrally formed in a step shape.

The backup lip 3 and the spacer 4 are provided with a stupid hole 5a through which the bolt 5 passes, and the doctor lip 2 is provided with a screw hole 5b into which the bolt 5 is screwed. In addition, the doctor lip 2 may be made a stupid hole, and the lip may be connected by a bolt and a nut.

A coating liquid supply port 6 is provided at the center in the longitudinal direction on the inner surface of the doctor lip 2 of the two lips 2 and 3, and the coating liquid is supplied from the coating liquid supply port 6 obliquely to the left and right sides. A guiding manifold 7 is provided. A coating liquid supply unit (not shown) is connected to the outside of the coating liquid supply port 6 directly or via a supply pipe. The application liquid supply means may be a known one, and examples thereof include a gear pump, a mono pump, a diaphragm pump, and a syringe pump.

The manifold 7 has a doctor lip 2
It may be provided not on the side but on the backup lip 3 side, or may be provided on both the doctor lip 2 and the backup lip 3. As shown in the figure, the shape of the manifold 7 as viewed from the front is preferably a coat hanger type inclined from the application liquid supply port 6 to both the left and right sides. It may be a T-type that is extended. Further, the number of the manifolds 7 is not limited to one, and may be provided in a plurality of stages in the application liquid discharging direction.

A land portion 8 having a narrow gap is formed below the lower edge of the manifold 7 between the two lips 2 and 3, and a longitudinal slit-like opening is formed between the lips at the lower end of the land portion 8. Discharge port 9 is formed. The land portion 8 has a function of providing a flow resistance to the coating liquid by forming a narrow gap with a certain length in the coating liquid discharge direction, and uniformly distributing the coating liquid in the longitudinal direction of the discharge port 9.

[0026] The coating apparatus of the present invention has the above structure,
The flatness of the inner surface of the lip in the land portion 8 is 0.01 mm
Or less, preferably 0.004 mm or less. As described above, the flatness of the inner surface of the lip in the land portion 8 is 0.
By being finished with high precision to 01mm or less,
The flow resistance of the coating liquid passing through the lands 8 is uniformly distributed over the entire length between the lips.

The connecting means such as the bolts 5 are arranged so that the shortest distance L ₁ to the upper edge of the manifold 7 is in the range of 2 to 20 mm, preferably 5 to 15 mm. As shown in the figure, a line segment C drawn in parallel with the upper edge of the manifold 7 through the center of the connection means (bolt hole) located at the center in the longitudinal direction of the lip is within an opening angle of ± 3 °. Preferably, they are arranged within a range of an opening angle of ± 1 °.

By arranging the bolts 5 at the positions regulated as described above, the lips 2 and 3 in the land portion 8 and the discharge port 9 are hardly distorted, and the lip assembly accuracy is improved. The gap between the lips 2 and 3 at the land portion 8 and the discharge port 9 can be made uniform in the longitudinal direction without special skill. The shortest distance L ₁ is 2mm
If it is less than 20 mm, a deformation that the slit discharge port (lip gap) becomes narrow occurs, and if it is more than 20 mm, a deformation that expands occurs.

In the present invention, preferably, the shortest distance L ₂ (see FIG. 3) from the connecting means such as the bolt 5 to the discharge port 9 is in the range of 30 to 100 mm, more preferably in the range of 50 to 70 mm. Good. The shorter the shortest distance L ₂ , the smaller the distortion of the lips 2 and 3 at the discharge port 9. However, if the shortest distance L ₂ is smaller than 30 mm, the flow path in the coating liquid discharge direction of the land 8 is shortened. Thus, it is not possible to provide a sufficient flow resistance to widen the entire length of the wire 7. On the other hand, if the length is longer than 100 mm, the distortion applied to the lip gap increases, and the lip gap accuracy of the land portion 8 and the discharge port 9 decreases.

The pitch L ₃ between the adjacent bolts 5 and 5 (see FIG. 3) is not particularly limited, but is preferably in the range of 50 to 100 mm from the viewpoint of sealing performance and ease of assembly work. More preferably, it is desirable to make the pitch equal within a range of 50 to 100 mm.

The above-mentioned effect of making the lip width uniform at the land portion and the discharge port can be exerted irrespective of the size of the slit length by adopting the above configuration, but it is impossible especially with the conventional coating apparatus. If there was such a slit length (corresponding to the longitudinal length L ₄ of the manifold 7 as shown in FIG. 3) is not less than 800 mm, even further when the more long 1000 mm, can be obtained stably.

In the present invention, the flatness of the lip inner surface described above refers to a shape deviation defined in “Definition and Display of Geometric Deviation” of JIS B 0621 (1984). That is, it refers to the magnitude of the deviation of the planar feature from the geometrically correct plane.

For the actual measurement, a known method that can ensure measurement accuracy and reproducibility may be applied. For example, a combination of a precision surface plate and an indicator, an optical flat, a level,
Using a reference straight line or a reference plane of a measuring instrument such as an autocollimator or a laser interferometer, the deviation of the surface to be measured with respect to the reference is detected by a dimension or an angle. The maximum deviation from the reference plane set by a known calculation method such as the multiplication method may be used as the flatness.

The shortest distance L ₁ from the connecting means to the upper edge of the manifold and the shortest distance L ₂ from the connecting means to the discharge port transmit the close contact force (tightening force) to the backup lip 2 and the doctor lip 3, respectively. The distance (L ₁ ) from the end of the connecting means to the upper edge of the manifold in the direction of discharge of the coating liquid and the distance (L ₂ ) from the end of the same connecting means to the discharge port. When the bolt is the connecting means, as shown in FIG. 2, the distance is from the head of the bolt 5 to the upper edge of the manifold 7 and also from the discharge port 9.

As shown in FIG. 3, when the coating liquid supply port 6 is located at the center of the lip in the longitudinal direction of the lip, as shown in FIG. At both bolt holes 5b, 5b and / or the bolt 5 screwed into it.

FIG. 4 shows an embodiment corresponding to the above-mentioned third invention.

FIG. 4 shows only the doctor lip 2,
The backup lip 3 and the spacer 4 are omitted. The doctor lip 2 has a plurality of screw holes 5b for bolts 5.
Are provided so as to extend linearly on both left and right sides of the coating liquid supply port 6. Sequence itself of the screw hole 5b is the same as the conventional apparatus of FIG. 9, one of the screw holes 5b also, the shortest distance L ₁ from the screw holes 5b to the upper edge of the manifold 7 is in a range of 2~20mm It is. Also,
The flatness of the inner surface of the lip in the land portion 8 is 0.01 mm
It is as follows.

In such a configuration, another plurality of screw holes 5b 'are formed parallel to the linearly arranged screw holes 5b so as to be limited to the central portion in the lip longitudinal direction.
Is located farther than the screw hole 5b.
Also, the backup lip 3 and the spacer 4 (not shown) are provided with stupid holes so as to correspond to the same positions as the screw holes 5b and 5b '.

Without providing the means for connecting the screw holes 5b ',
When only the connecting means of the screw holes 5b are linearly arranged, a phenomenon occurs in which the slit width G of the discharge port 9 becomes narrower at the center in the longitudinal direction of the slit as shown in FIG. By arranging the connecting means of the screw hole 5b 'at a position farther than the screw hole 5b with respect to the manifold 7 and limited to the center portion as described above, the screw is screwed into the screw hole 5b' at the far position. The bolt 5 widens the lip width of the discharge port 9 and distributes the entire lip width (slit width) of the discharge port 9 substantially uniformly in the longitudinal direction of the slit.

FIG. 5 shows an embodiment corresponding to the above-mentioned second invention.

In this embodiment, in the coating apparatus in which the doctor lip 2, the spacer 4, and the backup lip 3 are integrally connected and fixed by a plurality of bolts 5, the flatness of the lip inner surface in the land 8 is set to 0.01 mm or less. , The shortest distance L1 from the bolt 5 to the upper edge of the manifold 7 is in the range of ₂ to 20 mm as in the above-described embodiment. However, the difference is that the slit 10 is provided along the longitudinal direction of the lip in the region from the bolt 5 to the land 8 on the outer surface of the backup lip 3.

Although the shape of the slit 10 is not particularly limited, it is preferable to form a slit having a depth such that the thickness of the lip 3 is locally reduced to half or less (1/2 or less) in accordance with the discharge direction of the coating liquid. It is good to provide in the direction orthogonal. Further, it is preferable that the slit 10 be provided over the entire length in which a plurality of bolts 5 (connection means) are arranged in the lip longitudinal direction. By providing the slit 10, even if the lips 2 and 3 are distorted due to the tightening of the connecting means, the amount of distortion is reduced by the slit 10 and the land portion 8 and the discharge port 9 are disengaged.
Satisfactorily maintain the gap accuracy in the above.

FIGS. 6 to 8 exemplify a case where a coating material is manufactured by applying a coating liquid to a material to be coated by the coating apparatus of the present invention.

In the embodiment shown in FIG. 6, while the continuous web A is guided by the backup roller 21, the discharge port 9 of the coating apparatus 1 is set on the surface of the web A via a small distance.
A uniform coating film B is formed while discharging the coating liquid from the discharge port 9.

In the embodiment shown in FIG. 7, the discharge port 9 of the applicator 1 is similarly set at a small distance to the continuous web A moving between the transfer rollers 22 and 23, and the web A A coating film B is formed on the surface.

In the embodiment shown in FIG. 8, the back plate 2
4, a sheet-like glass plate A 'is adsorbed, and the discharge port 9 is arranged on the surface of the glass plate A' at a small distance.
While moving in the direction of the arrow with the back plate 24,
The coating liquid discharged from the discharge port 9 is applied to the surface of the glass plate A ′ to form a coating film B.

[0047]

EXAMPLES Examples 1 to 5 and Comparative Examples 1 to 4 The configuration according to FIG. 1 was adopted, and the flatness at the land portion, the shortest distance L ₁ , and the angle of the bolt center at the most central position with respect to the line segment C (degree of alignment) Examples 1 to 5 and Comparative Examples 1 to 4 were respectively made as shown in Table 1).

Using these nine coating apparatuses, the coating width was varied as shown in Table 1 and the coating conditions were made common as follows, and a coating liquid having a coating liquid viscosity of 15 mPa · s
mm on an aluminum plate (application member).

Distance between lip tip and coating member: average 1
00 μm (variation in the longitudinal direction is 10 μm or less) Average value of the lip gap: about 100 μm Coating speed: 15 m / min Coating thickness: 30 μm average The result of measuring the lip gap accuracy and coating film thickness accuracy in the above coating test, and the overall Table 1 shows the results of the evaluation. The overall evaluation was based on the following criteria.
○, △, ×

◎: Excellent (thickness distribution accuracy is very high as a product) ○: Good (thickness distribution accuracy can be used as a product) △: Slightly poor (thickness distribution adjustment is necessary to use as a product) ×): defective (level where thickness distribution adjustment is difficult and cannot be used as a product)

[0051]

[Table 1]

[0052] have a cut slits as shown in FIG. 5 to the back of the structure and the lip pursuant to Examples 6 and 7 1, coating apparatus in which the flatness and the shortest distance L ₁ in the land portion as described in Table 2 (Example 6)
If, while arranged linearly a plurality of bolts to the lip longitudinal direction as shown in FIG. 4, to add the six assembly bolts in the central portion, Table 2 flatness and the shortest distance L ₁ in the land portion
(Example 7) was manufactured as described in (1).

Using each of these two coating devices,
Table 2 shows the same conditions as in Example 1 and the like, and
The coating test was performed with the following differences. Table 2 shows the results.
Shown in

[0054]

[Table 2]

[0055]

As described above, according to the present invention, the lip gap at the discharge port and land can be made uniform in the longitudinal direction without requiring special skills in any of the inventions. Even when the coating width is increased, the coating thickness of the coating liquid can be made uniform over the entire width direction.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a coating apparatus according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the coating apparatus of FIG. 1 at the time of assembly.

FIG. 3 is an explanatory diagram showing a dimensional relationship of a lip in the coating apparatus of FIG. 1;

FIG. 4 is a perspective view showing a lip of another embodiment of the coating apparatus of the present invention.

FIG. 5 is a longitudinal sectional view showing still another embodiment of the coating apparatus of the present invention.

FIG. 6 is an explanatory diagram showing a use mode of the coating apparatus of the present invention.

FIG. 7 is an explanatory view showing another use mode of the coating apparatus of the present invention.

FIG. 8 is an explanatory view showing still another use mode of the coating apparatus of the present invention.

FIG. 9 is an exploded perspective view showing a conventional coating apparatus.

FIG. 10A is a plan view showing a discharge port of the apparatus of FIG. 9;
(B) is a graph showing the distribution of the coating film of the coating liquid applied from the discharge port of (A).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coating device 2, 3 Lip 4 Spacer 5 Bolt (connection means) 5a Fool hole 5b Screw hole 6 Supply port (for coating liquid) 7 Manifold 8 Land part 9 Discharge port 10 Cut slit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyoshi Minoura 1-1-1 Sonoyama, Otsu-shi, Shiga F-term (reference) in the Shiga Plant of Toray Industries, Inc. 4D075 AC02 AC08 AC09 CA48 DA04 DA06 DB07 DB13 DB18 DB31 DC18 DC21 DC24 DC27 EA07 EA10 EA45 4F041 AA02 AA05 AA12 AB01 BA12 CA02 5F046 JA02 JA27

Claims (6)

[Claims] 1. A manifold that guides a coating liquid in at least one lip inner surface in a longitudinal direction by fixing two horizontally long lips with a plurality of connecting means so as to form a slit-shaped discharge port between edges. In the coating apparatus provided with a narrow land portion between the manifold and the discharge port, the flatness of the inner surface of the lip at least in the land portion is set to 0.01 mm or less, and from each of the connecting means to the upper edge of the manifold. And the shortest distance L1 is set to ₂ to 20 mm, and ± 3 ° with respect to a line drawn in parallel with the upper edge of the manifold through the center of the connecting means positioned at the center of the lip in the longitudinal direction. A coating device arranged in the range of the opening angle. 2. A manifold that fixes two horizontally long lips with a plurality of connecting means so as to form a slit-like discharge port between the edges, and guides a coating liquid in at least one lip inner surface in a longitudinal direction. In the coating device, the flatness of the inner surface of the lip in at least the land portion is set to 0.01 mm or less, and the manifold is connected to the upper end of the manifold by the narrower land portion. shortest distance L ₁ as well as the 2 to 20 mm, at least one of an outer surface of the coating apparatus provided with a slit cut along the lip longitudinally region from the connecting means to the land portion of the lip of the. 3. A manifold for fixing the two horizontally long lips with a plurality of connecting means so as to form a slit-shaped discharge port between the edges, and guiding the coating liquid to at least one lip inner surface in the longitudinal direction. Provided, in a coating device in which the manifold and the discharge port communicate with each other with a narrow land portion, the flatness of the inner surface of the lip in at least the land portion is set to 0.01 mm or less, and the plurality of connecting means are connected from each connecting means. The shortest distance L1 to the upper edge of the manifold is linearly arranged in the longitudinal direction of the lip such that the shortest distance L1 is within the range of ₂ to 20 mm, and the center of the longitudinal direction of the lip is farther from the manifold than the connecting means. An application device in which another plurality of connecting means are additionally arranged in a row. 4. The coating apparatus according to claim 1, wherein the manifold is a coat hanger type manifold bent in a mountain shape around a coating liquid supply port provided at a center in a longitudinal direction of a lip. Wherein said claim 1 the shortest distance L ₂ from the connecting means to said discharge port and in the range of 30~100mm
5. The coating device according to any one of 4. 6. A method for manufacturing a coating member, wherein a coating liquid is applied to a specific coating material using the coating apparatus according to claim 1.