JP2003275644A - Coating method and coating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating device uniformly coating the band-like body with a coating liquid even in the case where the band-like body such as various kinds of base materials is traveled at a high speed, and to provide a coating method. <P>SOLUTION: The coating device is provided with a coating liquid deposition part for depositing the coating liquid on at least one surface of the band-like body traveling in a constant direction, and an adjustment coating part positioned at a downstream side of the coating liquid deposition part against the traveling direction of the band-like body and smoothing the coating liquid deposited on the band-like body at the coating liquid deposition part to a predetermined thickness. The coating liquid deposition part has the first coating bar rotated in the same direction as the traveling direction of the band-like body at a peripheral speed of 1/15 or higher of the traveling speed of the band-like body. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus and a coating method, and more particularly to a coating apparatus and a coating method that can obtain a uniform coating surface even when the traveling speed of a belt-shaped body is high.

[0002]

2. Description of the Related Art Lithographic printing plates, photographic materials, photographic papers, magnetic recording materials, coated metal plates and the like have been manufactured by applying a coating liquid such as a plate-making layer forming liquid onto a strip-shaped substrate.

A bar coater, a slide bead coater, an extrusion coater and the like are used for coating the coating liquid, and in particular, the bar coater has been widely used because of its easy handling.

Conventional bar coaters include: a. A type in which the base material is continuously run, a bar is brought into contact with the base material, and the bar is driven and rotated in the same direction as the running direction of the base material to scrape up the coating liquid and adhere to the base material. And b. A dam plate is provided on the upstream side of the bar, and the coating liquid is discharged from between the bar and the dam member while forcibly rotating the bar at a peripheral speed different from the traveling speed of the base material. The type in which the coating liquid is applied to the substrate has been mainly used.

[0005]

However, in the former type of bar coater, when the traveling speed of the base material is increased, the coating liquid is disturbed on the downstream side of the bar, and the coating liquid is applied to the base material. There is a problem that uniform pitch streaks, which are linear defects having substantially equal intervals, tend to occur on the coated surface coated with. In the latter type of bar coater, when the traveling speed of the base material increases, the amount of entrained air adhering to the surface of the base material and brought into the bar coater increases, and the bar and the dam member are The coating liquid discharged from between does not adhere evenly to the base material,
In many cases, a uniform coated surface could not be obtained.

It is an object of the present invention to provide a coating apparatus and a coating method capable of uniformly coating the coating liquid on the base material even when the belt-shaped body such as the various base materials is run at a high speed. .

[0007]

According to a first aspect of the present invention, there is provided a coating liquid adhering portion for adhering the coating liquid to at least one surface of a belt-shaped body traveling in a fixed direction, and a traveling direction of the belt-shaped body. And an adjusting coating section which is located on the downstream side of the coating solution adhering section and which adjusts the coating solution adhering to the strip at the coating solution adhering section to a predetermined thickness. The present invention relates to a coating apparatus, comprising: a first coating bar that rotates in the same direction as the traveling direction of the band-shaped body at a peripheral speed of 1/15 or more and 1 time or less the traveling speed of the band-shaped body.

In the following, "upstream side with respect to the traveling direction of the strip" is simply referred to as "upstream side" and "downstream side with respect to the traveling direction of the strip" is simply referred to as "downstream side".

The coating device is capable of stably coating the coating liquid even when the traveling speed of the strip is high, and the coating surface formed by coating the strip with the coating liquid has high uniformity. Have.

When the amount of the coating liquid adhered to the strip at the coating liquid adhering portion is excessive, the adjusting coating portion scrapes off the coating liquid to reduce the adhering amount, and at the coating liquid adhering portion, the strip-shaped portion is formed. When the amount of the coating liquid adhered to the body is too small, by further adhering the coating liquid to the strip,
It has a function of leveling the coating liquid to a predetermined thickness, in other words, adjusting it to a predetermined thickness.

The first coating bar provided in the coating liquid adhering portion is preferably made of metal from the viewpoint of strength and abrasion resistance. In particular, not only the strength and abrasion resistance are excellent, but also the corrosion resistance. Stainless steel is preferable because it is also excellent.

The first coating bar may be a smooth bar having a smooth surface, or a grooved bar having a groove formed on the surface in the circumferential direction.
It may be a wire bar having a surface wound with a wire in the circumferential direction.

In the grooved bar, the groove depth is preferably in the range of 0.05 to 1 mm, particularly 0.07 to
A range of 0.5 mm is preferred. The pitch of the grooves is preferably in the range of 0.05 to 1 mm, particularly 0.1
A range of up to 0.6 mm is preferred.

The cross-sectional shape of the groove can be various shapes such as a sine curve, a trapezoid, a semicircle and a triangle.

In the wire bar, the diameter of the wire is preferably 0.07 to 1 mm, and 0.07 to 1 mm.
A range of 0.6 mm is particularly preferred. From the viewpoint of corrosion resistance, abrasion resistance, and corrosion resistance, the material of the wire is preferably metal, and particularly preferably stainless steel.

The surface of the first coating bar may be hard chrome plated for the purpose of further improving abrasion resistance.

The rotation speed of the first coating bar, in other words, the peripheral speed is in the range of not less than 1/15 of the traveling speed of the strip and not more than the traveling speed of the strip depending on the coating thickness of the coating liquid. Can be set appropriately. When the barrier plate is provided on the upstream side of the first coating bar, the peripheral speed can be appropriately set within the above range depending on the height of the barrier plate and the coating thickness of the coating liquid.

Examples of the band-shaped body include a band-shaped and flexible thin plate-shaped or film-shaped article.
Specifically, in addition to the support web that is the base material of lithographic printing plates, film bases for photographic recording materials such as photographic film and motion picture film, baryta paper for photographic paper, recording tape, video tape, floppy (R ) A magnetic recording material substrate such as a polyester film used for a magnetic recording material such as a disk, and a thin metal plate for a coated metal plate such as a color iron plate are included, but are not limited thereto.

The strip-shaped body may be a tape-shaped body made of various kinds of paper such as kraft paper, sulfuric acid paper, polyethylene-coated paper and the like.

The coated surface of the strip may be subjected to various treatments such as graining and anodizing treatment of the support web.

The running speed of the strip can be appropriately set depending on the production speed, the coating thickness of the coating liquid, the surface quality required for the coating surface, etc., but is preferably 10 m / min or more, particularly 40 to 200 m / min. The range of minutes is preferred.

Examples of the coating liquid include plate-forming layer forming liquids such as a photosensitive layer forming liquid and a heat-sensitive layer forming liquid which are applied to a support web of a lithographic printing plate to form a plate-making layer, and oxygen impermeable such as polyvinyl alcohol. A solution containing a resin as a main component, an oxidation protection layer forming liquid applied on the plate-making layer, and a base for improving adhesion between the support web and the plate-making layer are formed on the grained surface of the support web. Examples of the undercoat forming liquid, various solvents, and the like.

As the coating liquid, a sensitizer emulsion used for forming a photosensitive layer of the photographic film, the motion picture film, the printing paper, etc., and an antihalation layer of the photographic film or the motion picture film are also formed as the coating liquid. Antihalation layer forming liquid used for the above, magnetic recording layer forming liquid for forming the magnetic recording layer in the magnetic recording material, and various paints used for undercoating, intermediate coating, and topcoating of the coated metal plate. However, as long as it is a solution, suspension, solvent or the like that can be applied to the substrate, it is not limited to the above. However, the viscosity of the coating liquid is 100 m
Pa · s or less is preferable, and 50 mPa · s or less is particularly preferable. The surface tension is preferably 20 to 70 mN / m.

The discharge amount of the coating liquid at the coating liquid adhering portion is determined by the traveling speed of the strip, the height of the dam member,
Although it can be appropriately determined according to the coating thickness of the coating liquid and the like, the range of 10 to 100 cc / m ² is preferable.

According to a second aspect of the present invention, the peripheral speed of the first coating bar is 1/15 to 3/4 of the running speed of the strip.
Which is a coating device.

The coating apparatus is an example of the coating apparatus according to claim 1, wherein the peripheral speed of the first coating bar is 3/4 or less of the traveling speed of the belt-shaped body.

According to the coating apparatus, a coating surface with higher uniformity can be obtained.

According to a third aspect of the present invention, the peripheral speed of the first coating bar is 1/10 to 1/2 of the traveling speed of the strip.
Which is a coating device.

According to the coating apparatus, a coating surface having particularly high uniformity can be obtained.

According to a fourth aspect of the invention, the coating device adjusts the coating solution to a predetermined thickness before the coating solution deposited on the strip in the coating solution depositing section is dried. Regarding

According to the coating apparatus, the layer of the coating liquid is leveled to a predetermined thickness in the adjusting coating unit before the coating liquid adhered to the strip at the coating liquid adhering portion is not dried. For example, since the adjustment is performed, the adjustment can be surely performed.

The invention according to claim 5 relates to a coating apparatus in which the adjustment coating section includes a second coating bar.

In the coating apparatus, the coating thickness of the coating liquid can be controlled in a wide range by controlling the peripheral speed and the rotating direction of the second coating bar.

In the coating apparatus, even if the second coating bar is rotated in the same direction as the running direction of the strip,
It may be rotated in the opposite direction.

The invention according to claim 6 relates to a coating device in which the second coating bar rotates in the same direction as the running direction of the strip.

The coating apparatus has a feature that, when the band-shaped body has a seam, a coating failure due to the seam hardly occurs when the seam passes through the adjustment coating unit.

According to a seventh aspect of the present invention, the belt-shaped body is
The present invention relates to a coating device that is a support web forming a base material of a lithographic printing plate.

The coating apparatus is an example in which the coating apparatus of the present invention is used for producing a lithographic printing plate.

According to the coating apparatus, even when the support web is run at a high speed, a uniform coating surface is formed on the surface of the support web, so that defective products are less likely to occur.

The support web is a base material of the lithographic printing plate as described above, and specific examples thereof include an aluminum support web in which at least one surface of an aluminum thin plate is grained.

As the coating liquid applied to the support web, the plate-making layer forming liquid, the oxidation protective layer forming liquid, and an undercoat for improving the adhesion between the support web and the plate-making layer are used as the support web. Examples of the base forming liquid to be formed on the grained surface and various solvents.

According to the invention of claim 8, the coating liquid is
The present invention relates to a coating device that is a plate-making layer forming liquid for forming a plate-making layer of the planographic printing plate.

According to the coating apparatus, the plate-making layer is stably formed even when the support web is run at high speed.

According to a ninth aspect of the present invention, there is provided a coating step of applying a coating liquid to at least one surface of a belt-shaped body traveling in a fixed direction, and a coating solution attached to the belt-shaped body in the coating liquid-attaching step. And a peripheral speed not lower than 1/15 times the traveling speed of the belt-shaped body in the same direction as the rotation direction of the belt-shaped body in the coating step. The present invention relates to a coating method characterized in that the coating liquid is adhered by a first coating bar that rotates at.

According to the coating method, the coating liquid can be stably coated even when the traveling speed of the strip is high, and a coating surface with high uniformity can be formed.

In the coating method, the preferable range of the peripheral speed of the first coating bar is 1/15 to 3/4 as in the case of the coating apparatus of the present invention, and the particularly preferable range is 1. /
It is 10 to 1/2.

Further, it is preferable that the coating thickness is adjusted in the adjusting coating step before the coating liquid adhered to the strip in the coating step is dried.

[0048]

BEST MODE FOR CARRYING OUT THE INVENTION 1. Embodiment 1 An example of a coating apparatus according to the present invention is shown in FIG.
Shown in.

The coating apparatus 100 according to the first embodiment is a coating apparatus for coating the support web W, which is an example of the band-shaped body of the present invention, with the plate-making layer forming liquid, which is an example of the coating liquid of the present invention.

As shown in FIG. 1, the coating apparatus 100 according to the first embodiment has a coating liquid adhering portion 2 for adhering a plate-making layer forming liquid to the graining surface Sg of a support web W, and an arrow a in FIG. The adjusting coating section 4 is located on the downstream side of the coating solution adhering section 2 with respect to the traveling direction of the support web W, and adjusts the plate-making layer forming solution adhered by the coating solution adhering section 2 to a predetermined thickness.

Both the coating liquid adhering portion 2 and the adjusting coating portion 4 are fixed to the bottom surface of a box-shaped base 6 whose top surface is open.

The base 6 is supported by a lifting device 8 so that it can be lifted and lowered from below. When applying the plate-making layer forming liquid to the support web W, the base 6 is raised by the elevating device 8, and when the coating is not performed, the base 6 is lowered by the elevating device 8.

Conveying rollers 32 and 34 for conveying the support web W along the traveling direction a are provided above the coating device 100 across the traveling surface T. Transport roller 32
Is located on the upstream side of the coating liquid adhering section 2, and the carrying roller 34 is located on the downstream side of the adjusting coating section 4.

As shown in FIG. 1, the coating liquid adhering portion 2 is located below the traveling surface T, which is the traveling path of the support web W, and is arranged along the horizontal plane at a right angle to the traveling direction a. The first coating bar 22 and the first coating bar supporting groove 24A having a V-shaped cross section are plate-shaped members formed on the top surface. In the first coating bar supporting groove 24A, the first coating bar 22 is formed. A support member 24 for supporting the first coating bar 22 and the support member 24 on the upstream side of the support member 24 and the first coating bar 22 in the traveling direction a so as to face the first coating bar 22 and the support member 24. And a weir-like member 26 provided in parallel with 22.

As the first coating bar 22, any of the above-mentioned smooth bar, grooved bar, and wire bar can be used. The first coating bar 22 rotates in the same direction as the traveling direction a, in other words, rotates in the normal direction. The first coating bar 22 rotates at a peripheral speed not lower than 1/15 of the traveling speed of the support web W and not higher than the traveling speed of the support web W. The first coating bar 22 is
When rotating at a peripheral speed equal to the traveling speed of the support web W, a coating layer formed by directly contacting the graining surface Sg of the support web or by applying the plate-making layer forming liquid to the graining surface Sg. Can be driven to rotate via. On the other hand, when rotating at a peripheral speed lower than the traveling speed,
It is preferable to forcibly drive at a predetermined rotation speed by an appropriate drive means such as a motor. In this case, it is preferable that the drive means and the first coating bar 22 are coupled by an appropriate coupling means such as a clutch so that the coupling can be released as needed.

The relative positional relationship among the first coating bar 22, the support member 24 and the dam member 26 will be described below.

The dam-like member 26 is a wall-like member provided along the vertical direction, and the distance d between the surface facing the first coating bar 22 and the outer peripheral surface of the first coating bar 22 is 3 to. 30 mm
It is arranged so as to be in the range of.

A vertical surface 26A is formed on the surface of the upper end of the weir-like member 26 facing the first coating bar 22. On the other hand, an inclined surface 26B that descends toward the upstream side is formed on the side of the dam member 26 opposite to the surface.

At the time of applying the plate-making layer forming liquid, the first
The peripheral speed of the coating bar 22 is 1 times the traveling speed of the support web W.
/ 15 or more, preferably in the range of 1/15 to 3/4, particularly preferably in the range of 1/10 to 1/2.

As shown in FIG. 1, a coating liquid flow path 28 for discharging the plate-making layer forming liquid toward the support web W passing above is provided between the support member 24 and the dam member 26. ing.

The adjustment coating section 4 is located below the traveling surface T of the support web W, and is arranged horizontally along a horizontal plane in a direction perpendicular to the traveling direction a of the support web W.
A second coating bar 42 that rotates in a direction opposite to the traveling direction a, and a first coating bar supporting groove 44 having a V-shaped cross section.
A is a plate-shaped member formed on the top surface, and in the first coating bar supporting groove 44A, the supporting member 44 that supports the second coating bar 42 from below and the supporting member 4 in the traveling direction a.
4 and upstream of the second coating bar 42, the upstream dam plate 46 provided in parallel to the second coating bar 42 so as to face the second coating bar 42 and the support member 44,
On the opposite side of the upstream dam plate 46 with the support member 44 interposed, the downstream dam plate 48 provided in parallel to the second coating bar 42 so as to face the second coating bar 42 and the supporting member 44. With.

As the second coating bar 42, the same smooth bar, grooved bar, wire bar and the like as described for the first coating bar 22 can be used.

The second coating bar 42 may be rotated forward,
Further, the support web W may be rotated (reversed) in the direction opposite to the traveling direction a, but a seam may be formed on the support web, and the seam portion may be the seam portion.
It is preferable that the second coating bar 42 is rotated in the forward direction, because coating defects due to the seam portion are unlikely to occur when the second coating bar 42 passes through.

Both the upstream dam plate 46 and the downstream dam plate 48 are bent toward the second coating bar 42 at the upper ends.

An upstream coating solution reservoir 50 is provided between the upstream dam plate 46 and the second coating bar 42 and the support member 44 to store the coating solution and prevent the second coating bar 42 from drying. There is. Similarly, the downstream dam plate 48 and the second coating bar 42
And the support member 44 between the downstream coating liquid reservoir 52.
Is provided. The plate-making layer forming liquid is supplied from below to both the upstream-side coating liquid pool 50 and the downstream-side coating liquid pool 52, and the liquid level of the plate-making layer forming liquid is maintained at a constant height. To keep the liquid level of the plate-making layer forming liquid at a constant height,
The plate-making layer forming liquid may overflow from the respective tops of the upstream dam plate 46 and the downstream dam plate 48.

On the bottom surface of the base 6, a first liquid supply channel 6A for supplying the plate-making layer forming liquid to the coating liquid channel 28 and a second liquid supplying layer for supplying the plate-making layer forming liquid to the upstream side coating liquid reservoir 50. Liquid flow path 6B
And a third liquid supply flow path 6C for supplying the platemaking layer forming liquid to the downstream coating liquid reservoir 52. On the bottom of the base 6,
Further, in the coating liquid adhering portion 2, a first drainage pipe 6D for collecting the plate-making layer forming liquid that overflows the dam 26 and flows down between the upstream side wall of the base 6 and the dam 26. The second drainage pipe 6E for collecting the plate-making layer forming liquid flowing down between the dam member 26 and the upstream dam plate 46, and the downstream side wall of the base 6 overflowing the downstream dam plate 48. A third drainage conduit 6F for collecting the plate-making layer forming liquid that has flowed down between the downstream dam plate 48 is provided.

The operation of the coating apparatus 100 will be described below.

The carrier web W is conveyed by the conveying rollers 32 and 34 in the direction of arrow a so that the graining surface Sg faces downward.

The plate-making layer forming liquid supplied from the first liquid supply pipe 6A to the coating liquid flow path 28 is scraped upward by the first coating bar 22 at the top of the coating liquid flow path 28 and is then supported by the support web. It adheres to the grained surface Sg of W. Here, the first coating bar 22 is 1/1 times the traveling speed of the support web W.
The plate making layer forming liquid is sufficiently scraped upward by the first coating bar 22 because it is rotated normally at a peripheral speed of 5 or more. Therefore, even when the support web W is run at a high speed, the plate-making layer forming liquid is uniformly attached.

The plate-making layer forming liquid adhered to the graining surface Sg of the support web W in the coating liquid adhering portion 2 is then adjusted to a predetermined thickness by the second coating bar 42 in the adjusting coating portion 4.

In the adjustment coating section 4, the second liquid supply line 6
B and the third liquid supply line 6C, the upstream side coating liquid reservoir 50
And by supplying the plate-making layer forming liquid to the downstream side coating liquid reservoir 52 so that the plate-making layer forming liquid overflows upstream or downstream beyond the upstream dam plate 46 and the downstream dam plate 48. The liquid level height of the plate-making layer forming liquid in the upstream coating liquid reservoir 50 and the downstream coating liquid reservoir 52 can be kept constant. Therefore, since the surface of the second coating bar 42 is always kept in a wet state, solid matter is not generated and attached to the grained surface Sg of the support web W.

As described above, the coating apparatus according to the first embodiment can be used even when the traveling speed of the support web W is high.
Since the plate-making layer forming liquid can be applied uniformly and the back side is not generated, the plate-making layer in the lithographic printing plate can be formed efficiently.

[0073]

EXAMPLES (Examples 1 to 5, Comparative Examples 1 to 3) One side of an aluminum web was grained according to a conventional method, and the grained surface was anodized to obtain a support web W.

Using the coating apparatus 100 shown in FIG. 1, a photosensitive layer forming liquid, which is an example of a plate-making layer forming liquid, was applied to the support web W.

The coating conditions of the photosensitive layer coating liquid were as follows.

A. Thickness of support web W ... 0.3 mm b. Traveling speed of the support web W ... 150 m / min c. Adhesion amount of photosensitive layer forming liquid: 50 cc / min (coating liquid adhering part 2) ... 15 cc / min (adjustment applying part 4) d. Diameter of bar: 10 mm (both first coating bar 22 and second coating bar 42) e. Rotational speed (peripheral speed) of the first coating bar 22 ... As shown in Table 1. f. Rotational speed (peripheral speed) of the second coating bar 42 ... 16 m / min (normal rotation) g. Viscosity of photosensitive layer forming liquid: 30 mPa · s Applicability indicating whether or not the plate making layer forming liquid can be stably applied to the grained surface Sg of the support web W, and the plate making layer forming liquid is applied to the grain forming surface Sg. For the coating surface quality indicating the surface quality of the coating surface formed by the visual inspection,
The evaluation was made in four grades of “⊚”, “◯”, “Δ” and “x”.
The results are shown in Table 1.

[0077]

[Table 1]

In the column "Rotating direction / rotating speed of bar" in Table 1, "+" indicates that the first coating bar or the second coating bar has been turned forward, and "-" indicates the first coating bar. It indicates that the coating bar or the second coating bar has been reversed. In addition, in the column of “first coating bar” in the above column, the number enclosed in parentheses is the ratio of the peripheral speed of the first coating bar to the traveling speed of the support web W.

As shown in Table 1, in Comparative Example 1 in which the peripheral speed of the first coating bar was less than 1/15 times the traveling speed of the support web W, an uncoated portion was generated on the grained surface Sg. However, the plate-making layer forming liquid could not be applied stably.

On the other hand, in Examples 1 to 4 in which the rotation speed of the first coating bar was 1/15 to 1 times the traveling speed of the support web W, in the thin coating portion along the longitudinal direction. It was found that the plate-forming layer forming liquid can be applied almost stably, although a certain bead streak may occur.

[0081]

As described above, according to the present invention,
Provided are a coating device and a coating method capable of uniformly coating a coating liquid even on a belt running at high speed.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a coating apparatus according to the present invention.

[Explanation of symbols]

2 Application liquid adhesion part 4 Adjustment coating section 6 bases 8 lifting device 22 First coating bar 24 Support member 26 Weir member 42 Second coating bar 44 Support member

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuki Ichikawa             Fuji-Sha, 4000 Kawajiri, Yoshida-cho, Haibara-gun, Shizuoka Prefecture             Shin Film Co., Ltd. F term (reference) 2H025 AA18 AB03 EA04 EA10                 2H084 BB02 BB13 CC05                 4D075 AC22 AC29 AC32 AC34 AC53 AC53                       AC72 AC84 AC92 AC93 AC94                       CA24 CA47 CB08 DA04 DB07                       DB18 DB31 DC27 DC28 EA07                       EA10                 4F040 AA22 AB00 AB06 AC01 BA29                       CB06 CB07 CB12 CB33 CB37

Claims (9)

[Claims] 1. A coating liquid adhering portion for adhering a coating liquid to at least one surface of a strip-shaped body traveling in a constant direction, and a downstream side of the coating liquid adhering portion with respect to the traveling direction of the strip-shaped body, The coating liquid adhering part comprises an adjusting coating part for adjusting the coating liquid adhered to the strip to a predetermined thickness, and the coating liquid adhering part is in the same direction as the running direction of the strip, A coating apparatus comprising a first coating bar that rotates at a peripheral speed not lower than 1/15 and not higher than 1 times the traveling speed of the strip. 2. The coating apparatus according to claim 1, wherein the peripheral speed of the first coating bar is 1/15 to 3/4 of the traveling speed of the belt-shaped body. 3. The coating apparatus according to claim 1, wherein the peripheral speed of the first coating bar is 1/10 to 1/2 of the traveling speed of the belt-shaped body. 4. The adjusting / applying unit adjusts the coating liquid to a predetermined thickness before the coating liquid adhered to the strip in the coating liquid adhering unit is dried. The coating device according to the item. 5. The coating apparatus according to claim 1, wherein the adjustment coating section includes a second coating bar. 6. The coating apparatus according to claim 5, wherein the second coating bar rotates in the same direction as the traveling direction of the belt-shaped body. 7. The coating apparatus according to claim 1, wherein the strip is a support web that forms a base material of a lithographic printing plate. 8. The coating apparatus according to claim 7, wherein the coating liquid is a plate-making layer forming liquid that forms a plate-making layer of the planographic printing plate. 9. A coating step of depositing a coating solution on at least one surface of a strip running in a fixed direction, and an adjustment of adjusting the coating solution deposited on the strip in the coating solution depositing step to a predetermined thickness. A first coating bar that rotates in the same direction as the rotation direction of the strip at a peripheral speed of 1/15 or more and 1 time or less of the traveling speed of the strip in the coating step. The coating method is characterized in that the coating liquid is adhered by the method.