JP3881267B2 - Coating apparatus and coating method - Google Patents

Description

表１に示すように、塗布液付着部２における堰状部材２６の高さが、第１塗布バー２２の最下点の高さ以上であり、第１塗布バー２２の最上点−１ｍｍ以下である場合には、支持体ウェブＷの走行速度が１５０ｍ／分と速かったにもかかわらず、感光層形成液を均一に塗布することができた。
【００８７】
これに対して、堰状部材２６の高さが、第１塗布バー２２の最下点の高さよりも低い場合には、未塗布部が発生し、堰状部材２６の高さが、第１塗布バー２２の最上点−１ｍｍよりも高かった場合には、裏回りが発生した。
【００８８】
【発明の効果】
以上説明したように、本発明によれば、前記バーを有する塗布装置および前記塗布装置を用いた塗布方法において、基材の走行速度が高い場合にも、均一な塗布面が得られるものが提供される。
【図面の簡単な説明】
【図１】図１は、本発明に係る塗布装置の一例につき、構成を示す概略図である。
【図２】図２は、図１に示す塗布装置が備える塗布液付着部における第１塗布バーと支持台と堰状部材との高さの相対的な関係を示す拡大図である。
【図３】図３は、図１に示す塗布装置が備える塗布液付着部における第１塗布バーと堰状部材と製版層形成液の液面との相対的な位置関係を示す拡大図である。
【符号の説明】
２ 塗布液付着部
４ 調整塗布部
６ 基台
８ 昇降台
２２ 第１塗布バー
２４ 支持部材
２６ 堰状部材
４２ 第２塗布バー
４４ 支持部材[0001]
BACKGROUND 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 capable of obtaining a uniform coating surface even when the traveling speed of a belt-like body is high.
[0002]
[Prior art]
Lithographic printing plates, photographic materials, photographic paper, magnetic recording materials, coated metal plates, and the like have been produced by applying a coating solution such as a plate-making layer forming solution to a substrate such as a support web.
[0003]
For the application of the coating liquid, a bar coater, a slide bead coater, an extrusion coater or the like is used, and in particular, a bar coater has been widely used from the viewpoint of easy handling.
[0004]
As a bar coater,
a. The base material is continuously run, the bar is brought into contact with the base material, the follower is rotated in the same direction as the travel direction of the base material, the coating liquid is scraped, and the base material is attached to the base material, and
b. A barrier 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. A type in which the coating liquid is applied to the substrate.
Has been used mainly.
[0005]
[Problems to be solved by the invention]
However, in the former type of bar coater, when the running speed of the base material is increased, the coating liquid is disturbed on the downstream side of the bar, and the coating surface on which the coating liquid is applied is substantially applied to the base material. There has been a problem that equal pitch streaks, which are streaky defects at equal intervals, are likely to occur. In the latter type of bar coater, when the traveling speed of the base material increases, the amount of entrained air that adheres to the surface of the base material and is brought into the bar coater increases, and the bar and the weir-shaped member In many cases, the coating liquid discharged from between them does not adhere uniformly to the substrate, and a uniform coated surface cannot be obtained.
[0006]
An object of the present invention is to provide a coating apparatus having the bar and a coating method using the coating apparatus, which can obtain a uniform coated surface even when the running speed of a substrate is high.
[0007]
[Means for Solving the Problems]
  According to the first aspect of the present invention, there is provided a coating liquid adhesion portion that adheres a coating liquid to at least one surface of a continuously running belt-like body, and a position downstream of the coating liquid adhesion portion with respect to the running direction of the belt-like body And an adjustment application part that equalizes the coating liquid attached to the strip in the coating liquid attachment part to a predetermined thickness, and the coating liquid attachment part is in the same direction as the traveling direction of the strip. A first application bar that rotates, and is disposed on the upstream side of the first application bar with respect to the traveling direction of the band-like body, relative to the first application bar, and the first application bar and the band-like body; And a weir-like member that forms a liquid pool of the application liquid and adheres the application liquid to the belt-like body, and the top surface of the weir-like member has a height of the first application bar. The height of the uppermost point on the surface of the first coating bar is equal to or higher than the height of the lowest point on the surface. It is -1mm belowIn addition, the adjustment application unit includes a second application bar that rotates in the same direction as or opposite to the traveling direction of the strip, and the upstream side of the second application bar with respect to the traveling direction of the strip. An upstream weir member disposed relative to the application bar, and disposed downstream of the second application bar with respect to the traveling direction of the strip, relative to the second application bar. A downstream weir-like member, and supplies a coating liquid between the second application bar and the upstream weir-like member, and between the second application bar and the downstream weir-like member, thereby collecting a liquid. FormThe present invention relates to a coating apparatus. In the following, “upstream side with respect to the traveling direction of the strip” is simply referred to as “upstream”, and “downstream with respect to the traveling direction of the strip” is simply referred to as “downstream”.
[0008]
In the coating apparatus, since the height of the dam member in the coating liquid adhesion portion is within the range, the coating liquid discharged from between the first coating bar and the dam member at the time of coating. The height of the liquid surface is also not less than the height of the lowest point on the surface of the first coating bar and not more than the height of the highest point on the surface of the first coating bar minus 1 mm.
[0009]
Accordingly, since the first application bar is always in a state of being in contact with the application liquid, the application liquid is sufficiently scraped up by the first application bar and adheres to the belt-like body. Therefore, even when the traveling speed of the belt-like body is high, the coating liquid is uniformly applied. In addition, the coating liquid does not turn around on the surface opposite to the coating surface on which the coating liquid is applied in the belt-like body, so that the back is not generated.
[0010]
  Further, when the coating thickness of the coating liquid in the coating liquid adhesion portion is excessive, the adjustment coating section scrapes the coating liquid to reduce the coating thickness, and the coating thickness of the coating liquid in the coating liquid adhesion portion is When the thickness is too small, the coating liquid is further adhered to the coating liquid so that the coating liquid adhered to the belt-like body has a predetermined thickness, in other words, has a function of adjusting to the predetermined thickness.
When the rotation number of the second coating bar is increased in the adjustment coating unit, the coating thickness of the coating liquid in the obtained coating material is decreased, and when the rotation number of the second coating bar is decreased, the coating liquid in the resulting coating material is obtained. The coating thickness increases. Therefore, the coating thickness can be increased or decreased by increasing or decreasing the rotation speed of the second coating bar.
[0011]
Examples of the dam member provided in the coating liquid adhering portion include a wall-like member erected vertically so as to face the first coating bar. Further, the top of the wall-shaped member may be bent toward the first application bar. In the dam member, a surface of the top portion facing the first application bar is a surface along a direction parallel to a tangent line drawn on a portion of the outer peripheral surface of the first application bar facing the top portion. It is preferable that
[0012]
The first application bar is preferably made of metal from the viewpoints of strength and wear resistance, and particularly stainless steel because it is excellent not only in strength and wear resistance but also in corrosion resistance. Steel is preferred.
[0013]
The first application bar may be a smooth bar having a smooth surface, a grooved bar having grooves formed in the circumferential direction on the surface, and a circular bar on the surface. It may be a wire bar in which a wire is wound in the circumferential direction.
[0014]
In the grooved bar, the depth of the groove is preferably in the range of 0.05 to 1 mm, particularly preferably in the range of 0.07 to 0.5 mm. The pitch of the grooves is preferably in the range of 0.05 to 0.1 mm, and particularly preferably in the range of 0.1 to 0.6 mm.
[0015]
The cross-sectional shape of the groove can be various shapes such as a sine curve, a trapezoid, a semicircle, and a triangle.
[0016]
In the wire bar, the diameter of the wire is preferably in the range of 0.07 to 1 mm, particularly preferably in the range of 0.07 to 0.6 mm. The material of the wire is preferably a metal from the viewpoint of corrosion resistance, wear resistance, and corrosion resistance, and particularly preferably stainless steel.
[0017]
Hard chrome plating may be applied to the surface of the first application bar for the purpose of further improving the wear resistance.
[0018]
The rotation speed of the first application bar can be appropriately set according to the height of the dam member, the application thickness of the application liquid, and the like, but the first application bar is 1/15 of the traveling direction of the belt-like body. As described above, it is preferable to rotate the belt-like body at a peripheral speed equal to or less than the traveling direction.
[0019]
The strip is not particularly limited as long as it is a strip and is a flexible thin plate-like or film-like article, and specifically, an aluminum support web that is a support for a lithographic printing plate made of an aluminum thin plate. In addition, film bases for photographic recording materials such as photographic film and movie film, baryta paper for photographic paper, recording tape, video tape, magnetic films such as polyester film used for floppy (R) disk and other magnetic recording materials Examples thereof include a base material for recording material and a thin metal plate for a coated metal plate such as a color iron plate.
[0020]
Further, the belt-like body may be a tape-like body made of various papers such as kraft paper, sulfuric acid paper, and polyethylene-coated paper.
[0021]
Various treatments such as graining and anodizing treatment on the support web may be applied to the application surface of the strip.
[0022]
The running speed of the belt can be appropriately set according to the production speed, the coating thickness of the coating liquid, the surface quality of the coating surface, etc., but is preferably 10 m / min or more, and particularly preferably in the range of 40 to 200 m / min.
[0023]
As the coating solution, for example, a photosensitive layer forming solution or a thermosensitive layer forming solution that is applied to a support web of a lithographic printing plate to form a plate making layer, a solution of an oxygen-impermeable resin such as polyvinyl alcohol as a main component, An oxidation protective layer forming liquid applied on the plate-making layer, a base-forming liquid for forming a base for improving the adhesion between the support web and the plate-making layer on the grained surface of the support web, various solvents, etc. Is mentioned.
[0024]
In addition, the coating solution is used to form a photosensitive emulsion used to form a photosensitive layer such as the photographic film, movie film, and photographic paper, and to form an antihalation layer of the photographic film or movie film. Anti-halation layer forming liquid, magnetic recording layer forming liquid for forming a magnetic recording layer in the magnetic recording material, and various paints used for undercoating, intermediate coating, and overcoating of the coated metal plate. Any solution, suspension, and solvent that can be applied to the material is not limited to the above. However, the viscosity of the coating solution is preferably 100 mPa · s or less, particularly preferably 50 mPa · s or less. The surface tension is preferably in the range of 20 to 70 mN / m.
[0025]
The discharge amount of the coating liquid in the coating liquid adhering portion can be appropriately determined according to the traveling speed of the strip, the height of the dam member, the coating thickness of the coating liquid, etc. / M²The range of is preferable.
[0026]
  According to a second aspect of the present invention, there is provided a coating liquid adhering portion for adhering a coating liquid to at least one surface of a continuously running belt-like body, and a position downstream of the coating liquid adhering portion with respect to the running direction of the belt-like body. And an adjustment application unit that equalizes the coating liquid attached to the strip-like body to a predetermined thickness at the coating liquid attachment part, and the coating liquid attachment part is in the same direction as the running direction of the strip-like body. A first application bar that rotates, and is disposed on the upstream side of the first application bar with respect to the traveling direction of the band-like body, relative to the first application bar, and the first application bar and the band-like body; A weir-like member that forms a liquid pool of the coating solution and attaches the coating solution to the belt-like body, and a surface of the weir-like member facing the first application bar; The distance from the outer peripheral surface of the first application bar is 3 mm or more.In addition, the adjustment application unit includes a second application bar that rotates in the same direction as or opposite to the traveling direction of the strip, and the upstream side of the second application bar with respect to the traveling direction of the strip. An upstream weir member disposed relative to the application bar, and disposed downstream of the second application bar with respect to the traveling direction of the strip, relative to the second application bar. A downstream weir-like member, and supplies a coating liquid between the second application bar and the upstream weir-like member, and between the second application bar and the downstream weir-like member, thereby collecting a liquid. FormThe present invention relates to a coating apparatus.
[0027]
In the coating liquid adhering portion of the coating apparatus, since the distance between the weir-like member and the first coating bar is 3 mm or more, even if the coating liquid is scraped up by the first coating bar, the inside of the coating liquid adhering portion The liquid level of the coating liquid in is stable. Therefore, since the distribution of the amount of the coating liquid transferred from the coating liquid adhesion portion to the strip is uniform, the coating liquid uniformly adheres to the entire surface of the strip.
[0028]
  According to a second aspect of the present invention, there is provided a coating liquid adhering portion for adhering a coating liquid to at least one surface of a continuously running belt-like body, and a position downstream of the coating liquid adhering portion with respect to the running direction of the belt-like body. And an adjustment application unit that equalizes the coating liquid attached to the strip-like body to a predetermined thickness at the coating liquid attachment part, and the coating liquid attachment part is in the same direction as the running direction of the strip-like body. A first application bar that rotates, and is disposed on the upstream side of the first application bar with respect to the traveling direction of the band-like body, relative to the first application bar, and the first application bar and the band-like body; A weir-like member that forms a liquid pool of the coating solution and attaches the coating solution to the belt-like body, and a surface of the weir-like member facing the first application bar; The distance from the outer peripheral surface of the first application bar is 3 mm or more.In addition, the adjustment application unit includes a second application bar that rotates in the same direction as or opposite to the traveling direction of the strip, and the upstream side of the second application bar with respect to the traveling direction of the strip. An upstream weir member disposed relative to the application bar, and disposed downstream of the second application bar with respect to the traveling direction of the strip, relative to the second application bar. A downstream weir-like member, and supplies a coating liquid between the second application bar and the upstream weir-like member, and between the second application bar and the downstream weir-like member, thereby collecting a liquid. FormThe present invention relates to a coating apparatus.
[0029]
In the coating apparatus, since the first coating bar is always in a state of being in contact with the coating solution, the coating solution is sufficiently scraped up by the first coating bar and adheres to the strip. .
[0030]
Moreover, in the coating liquid adhesion part of the said coating apparatus, even if a coating liquid is scraped up by the said 1st coating bar because a space | interval of a weir-like member and a 1st coating bar is 3 mm or more, a coating liquid adhesion part The liquid level of the coating liquid inside is stable. Therefore, the distribution of the transfer amount of the coating liquid from the coating liquid adhering portion to the belt-like body is uniform.
[0031]
Therefore, even when the traveling speed of the belt-like body is high, the coating liquid is particularly uniformly applied, and the coating liquid is applied to the surface of the belt-like body opposite to the coating surface on which the coating liquid is applied. There will be no inside out.
[0032]
  According to a fourth aspect of the present invention, when the second application bar included in the adjustment application unit rotates in the same direction as the traveling direction of the belt-like body, the peripheral speed of the second application bar is equal to that of the first application bar. It is related with the coating device of any one of Claims 1-3 smaller than a circumferential speed.
[0033]
  In the coating device, since the relative speed of the second coating bar with respect to the strip is smaller than that of the coating device in which the second coating bar rotates in the direction opposite to the traveling direction of the strip, scraping is performed in the adjustment coating unit. The amount of the coating liquid to be applied is smaller than that of the coating apparatus of claim 7. Therefore, it is suitable for obtaining a larger coating thickness.
[0034]
  The invention described in claim 55. The coating apparatus according to claim 1, wherein the upstream weir member and the downstream weir member included in the adjustment application unit are each bent at an upper end toward the second application bar. About.
[0036]
  The invention described in claim 6The coating apparatus according to claim 2 or 3, wherein a distance between a surface of the dam member facing the first coating bar and an outer peripheral surface of the first coating bar is 3 to 30 mm.
[0037]
  According to the coating apparatus, a more uniform coated surface can be obtained as compared with the coating apparatus according to claim 2 or 3.
[0038]
  The invention described in claim 77. The coating apparatus according to claim 1, wherein a peripheral speed of the first coating bar is in a range of the same speed as a traveling speed of the belt-like body to 1/15 of the traveling speed.
[0040]
  The invention according to claim 8 relates to the coating apparatus according to any one of claims 1 to 7, wherein the traveling speed of the belt-like body is 100 m / min or more, and the invention according to claim 9 is the belt-like body. The travel speed of the body is 100 to 200 m / min, and the viscosity of the coating liquid is 50 mPa · s or less. The coating apparatus according to any one of claims 1 to 8.
[0041]
  In the coating apparatus, since the traveling speed of the strip is high, the coating liquid can be efficiently coated.
[0044]
  Claim 10The described invention relates to a coating apparatus in which the strip is a support for a lithographic printing plate.
[0045]
The coating device is an example in which the coating device of the present invention is applied to a lithographic printing plate.
[0046]
According to the coating device, for the same reason as described in the coating device according to claim 1, even when the traveling speed of the support web is high, the coating liquid is uniformly coated on the support web, Also, there is no occurrence of backside.
[0047]
Examples of the coating solution used in the coating apparatus include a plate making layer forming solution for forming a plate making layer, and an antioxidant layer forming solution for forming an antioxidant layer by applying the plate making layer on top of the plate making layer.
[0048]
  The invention according to claim 11The present invention relates to a coating apparatus in which the coating solution is a plate making layer forming solution for forming a plate making layer in a lithographic printing plate.
  The invention described in claim 12 is an aluminum support in which the strip is a base of a lithographic printing plate, and the coating solution is selected from a photosensitive layer forming solution and a thermal layer forming solution, and the lithographic printing plate A plate making layer forming liquid for forming a plate making layer. 1 One of 1 The present invention relates to the coating apparatus according to the item.
[0049]
The said coating apparatus is an example of the coating apparatus which apply | coats a platemaking layer forming liquid as a coating liquid in the coating apparatus of Claim 9.
[0050]
The plate-making layer forming liquid contains a photosensitive resin, and may be a photosensitive layer-forming liquid used for forming a visible light exposure type plate-making layer, and contains a heat-sensitive resin or a photopolymerizable resin, and a laser. It may be a laser photosensitive layer forming liquid used for forming an exposure type plate making layer.
[0051]
  The invention according to claim 13A coating liquid adhesion process for depositing the coating liquid on at least one surface of the continuously running belt-like body, and an adjustment coating process for equalizing the coating liquid deposited on the belt-like body in the coating liquid deposition process to a predetermined thickness. In the coating liquid adhesion step, on the upstream side of the first application bar with respect to the traveling direction of the strip, the first coating bar rotating in the same direction as the traveling direction of the strip, It is disposed relative to the first application bar, and the height of the top surface is the same as or higher than the height of the lowest point on the surface of the first application bar, and the highest point on the surface of the first application bar. A liquid pool of the coating liquid is formed between the weir-like member that is 1 mm or more lower than the height of the belt and the strip, and the coating liquid is adhered to the strip.A coating liquid is attached, and in the adjustment coating step, a second coating bar that rotates in the same direction as or opposite to the traveling direction of the strip, and an upstream side of the second coating bar with respect to the traveling direction of the strip. An upstream weir member disposed relative to the second application bar, and opposed to the second application bar on the downstream side of the second application bar with respect to the traveling direction of the strip. A liquid reservoir is formed by supplying a coating liquid to the downstream weir-like memberIt is related with the coating method characterized by this.
[0052]
According to the coating method, for the same reason as described in the coating apparatus according to claim 1, a uniform coated surface having no defective portion can be obtained even when the traveling speed of the belt-like body is high.
[0053]
  Claim 14The invention described is an application liquid adhesion step of adhering a coating liquid to at least one surface of a continuously running belt-like body, and an adjustment for equalizing the coating liquid adhered to the belt-like body to a predetermined thickness in the coating liquid adhesion step A coating step, and in the coating liquid adhering step, a first coating bar that rotates in the same direction as the travel direction of the strip, and the first coating bar that rotates with respect to the travel direction of the strip On the upstream side, a weir-like member that is disposed relative to the first application bar and has a distance of 3 mm or more between the surface facing the first application bar and the outer peripheral surface of the first application bar; Forming a liquid pool of the coating solution between the strip and the coating liquid to adhere to the strip.,  In the adjustment coating step, the second coating bar that rotates in the same direction as or opposite to the traveling direction of the strip, and the second coating bar upstream of the second coating bar with respect to the traveling direction of the strip. An upstream weir member disposed relative to the coating bar, and a downstream disposed relative to the second coating bar on the downstream side of the second coating bar with respect to the traveling direction of the strip A liquid reservoir is formed by supplying the coating liquid between the side weir members.It is related with the coating method characterized by this.
[0054]
In the coating method, for the same reason as described in the coating apparatus of claim 2, the coating liquid can be transferred from the coating liquid adhesion portion to the belt-like body with a uniform distribution. The coating liquid can uniformly adhere to the entire surface of the belt-like body.
[0055]
DETAILED DESCRIPTION OF THE INVENTION
1. Embodiment 1
FIG. 1 shows a schematic configuration of an example of a coating apparatus according to the present invention.
[0056]
The coating apparatus 100 according to the first embodiment is an example of a band-shaped body in the present invention, and the coating liquid in the present invention is applied to a support web W having a grained one surface of an aluminum web that is a continuous strip-shaped aluminum thin plate. It is a coating device which coat | covers the platemaking layer forming liquid which is an example.
[0057]
As shown in FIG. 1, the coating apparatus 100 according to the first embodiment includes a coating liquid attaching unit 2 that attaches a plate-making layer forming liquid to the grained surface Sg of a support web W, and a support indicated by an arrow a in FIG. 1. An adjustment application unit 4 is provided on the downstream side of the coating liquid adhesion part 2 with respect to the traveling direction of the web W, and equalizes the plate-making layer forming liquid adhered at the coating liquid adhesion part 2 to a predetermined thickness.
[0058]
The coating liquid adhering portion 2 and the adjustment applying portion 4 are both fixed to the bottom surface of a box-shaped base 6 having an open top surface.
[0059]
The base 6 is supported by a lift 8 so that it can be lifted from below. When the plate making layer forming liquid is applied to the support web W, the base 6 is moved up by the lift 8, and when the application is not performed, the base 6 is moved down by the lift 8.
[0060]
As shown in FIG. 1, the coating liquid adhering portion 2 is positioned below a traveling surface T that is a traveling path of the support web W, and is provided with a first coating bar 22 disposed at right angles to the traveling direction a. The first coating bar support groove 24A having a V-shaped cross section is a member on a plate formed on the top surface, and the first coating bar support groove 24A supports the first coating bar 22 from below. 24 and on the upstream side of the support member 24 and the first application bar 22 with respect to the running direction a, and provided in parallel to the first application bar 22 so as to face the first application bar 22 and the support member 24. The weir-like member 26 is provided.
[0061]
As the first application bar 22, any of the aforementioned smooth bar, grooved bar, and wire bar can be used. The first application bar 22 rotates in the same direction as the traveling direction a. The first coating bar 22 may be forcibly driven at a predetermined rotational speed by an appropriate driving means, and directly or through a coating layer in which the plate-making layer forming liquid is applied to the grained surface Sg of the support web. May be driven and rotated. The first coating bar 22 is preferably rotated at a peripheral speed that is at least 1/15 of the travel speed of the support web W and less than or equal to the travel speed of the support web W.
[0062]
A relative positional relationship among the first application bar 22, the support member 24, and the weir member 26 is shown in FIG.
[0063]
The dam member 26 is a wall-like member provided along the vertical direction, and the distance d between the surface facing the first application bar 22 and the outer peripheral surface of the first application bar 22 is in the range of 3 to 30 mm. It is arranged to become.
[0064]
As shown in FIG. 2, the height h of the top surface of the weir-like member 26 from the bottom surface of the base 6 is the height H of the lowest point on the surface of the first application bar 22 from the bottom surface of the base 6.₁The height H of the uppermost point on the surface of the first application bar 22 from the bottom surface of the base 6 is as described above.₂Height H 1mm lower than_ThreeIt is as follows. Height H of the lowest point on the surface of the first application bar 22₁As shown in FIG. 2, the horizontal plane P that contacts the surface of the first application bar 22 from below is shown.₁Horizontal plane P that touches from above₂Horizontal plane P in contact with the bottom₁It can be paraphrased as the height of. Further, the height H of the uppermost point on the surface of the first application bar 22₂Is the horizontal plane P that touches from above₂It can be paraphrased as the height of.
[0065]
A vertical surface 26 </ b> A is formed on the surface of the upper end portion of the weir member 26 on the side facing the first application bar 22. On the other hand, an inclined surface 26 </ b> B is formed on the opposite side of the weir-like member 26 from the above-mentioned surface, and is inclined upward at the upper end portion toward the upstream side.
[0066]
As shown in FIGS. 1 and 2, a coating liquid flow path 28 is provided between the support member 24 and the weir-like member 26 to discharge the plate-making layer forming liquid toward the support web W passing above. ing.
[0067]
The adjustment application unit 4 is located below the running surface T of the support web W, and is disposed horizontally along a direction perpendicular to the running direction a of the support web W, opposite to the running direction a. And a first coating bar support groove 44A having a V-shaped cross section, which is a member on a plate formed on the top surface. In the first coating bar support groove 44A, A support member 44 that supports the first application bar 42 from below, and on the upstream side of the support member 44 and the first application bar 42 with respect to the traveling direction a, so as to face the first application bar 42 and the support member 44. An upstream dam plate 46 provided in parallel to the first application bar 42 and the first application bar 42 and the support member 44 are opposed to the upstream dam plate 46 across the support member 44. In parallel to the first coating bar 42 And a flow side weir plate 48.
[0068]
As with the first application bar 22, a smooth bar, a grooved bar, a wire bar, or the like can be used as the second application bar 42.
[0069]
The rotation direction of the second application bar 42 may be the same direction (forward rotation) as the traveling direction of the support web W, or may be the opposite direction (reverse rotation). Further, although the peripheral speed can be set according to the desired coating thickness of the plate-making layer forming liquid, when the rotation direction of the second application bar 42 is the same as the traveling direction of the support web W, the peripheral speed is It is preferable that the speed is lower than the peripheral speed of one coating bar 22.
[0070]
Both the upstream side weir plate 46 and the downstream side weir plate 48 are bent toward the first application bar 42 at the upper end portion.
[0071]
Between the upstream side weir plate 46, the first application bar 42, and the support member 44, an upstream side application liquid reservoir 50 that stores the application liquid and prevents the first application bar 42 from drying is provided. Similarly, a downstream coating liquid reservoir 52 is provided between the downstream weir plate 48, the first application bar 42, and the support member 44. The plate-making layer forming solution is supplied from below to both the upstream-side coating solution reservoir 50 and the downstream-side coating solution reservoir 52, and the plate-making layer-forming solution overflows from the respective top portions of the upstream-side dam plate 46 and the downstream-side dam plate 48. You may make it flow.
[0072]
On the bottom surface of the base 6, a first liquid supply passage 6 </ b> A that supplies a platemaking layer forming liquid to the coating liquid passage 28 and a second liquid supply passage that supplies a platemaking layer forming liquid to the upstream side coating liquid reservoir 50. 6B and a third liquid supply channel 6C for supplying the plate-making layer forming liquid to the downstream coating liquid reservoir 52 are provided. Further, on the bottom surface of the base 6, the weir-like member 26 overflows in the coating liquid adhering portion 2, and the plate-making layer forming liquid flowing down between the upstream side wall of the base 6 and the weir-like member 26 is collected. Overflowing the first drainage pipe 6D, the second drainage pipe 6E for recovering the plate-forming layer forming liquid flowing down between the weir-like member 26 and the upstream side weir board 46, and the downstream side weir board 48 A third drainage conduit 6F is provided between the downstream side wall of the base 6 and the downstream weir plate 48 to collect the platemaking layer forming liquid that has flowed down.
[0073]
Conveying rollers 32 and 34 for conveying the support web W along the traveling direction a are provided above the coating apparatus 100 with the traveling surface T interposed therebetween. The conveyance roller 32 is located on the upstream side of the coating liquid attaching unit 2, and the conveyance roller 34 is located on the downstream side of the adjustment application unit 4.
[0074]
The operation of the coating apparatus 100 will be described below.
[0075]
The support web W is transported along the direction of the arrow a by the transport rollers 32 and 34 so that the grained surface Sg faces downward.
[0076]
The plate-making layer forming liquid supplied from the first liquid supply pipe 6 </ b> A to the coating liquid flow path 28 is scraped upward by the application roller 22 at the top of the coating liquid flow path 28 and the grained surface of the support web W. It adheres to Sg. Here, the height of the weir-like member 26 is not less than the lowest point on the surface of the first application bar 22 and not more than the highest point on the surface of the first application bar 22 −1 mm.
[0077]
Here, the height of the liquid surface of the plate-making layer forming liquid in the coating liquid flow path 28 is equal to or slightly higher than the height of the weir-like member 26. Therefore, as shown in FIG. Is equal to or higher than the lowest point of the first coating bar 22 and is lower than the highest point. Therefore, when coating the plate making layer forming liquid, the first coating bar 22 always has a part of the surface immersed in the plate making layer forming liquid. It is in the state that was done. Therefore, the plate making layer forming liquid is sufficiently scraped upward by the first coating bar 22, so that the plate making layer forming liquid adheres evenly even when the traveling speed of the support web W increases.
[0078]
On the other hand, since the first coating bar 22 is not completely submerged in the plate making layer forming liquid, it is prevented that the plate making layer forming liquid is excessively raked up and a back side adhering to the back side of the support web W is generated. Is done.
[0079]
Next, the plate-forming layer forming liquid adhering to the grained surface Sg of the support web W in the application liquid adhering portion 2 is adjusted to a predetermined thickness by the second application bar 42 in the adjustment applying portion 4.
[0080]
In the adjustment coating unit 4, the upstream plate weir is supplied from the second liquid supply line 6B and the third liquid supply line 6C to the upstream coating liquid reservoir 50 and the downstream coating liquid reservoir 52. By making the plate-making layer forming liquid overflow the upstream side or the downstream side beyond the plate 46 and the downstream side weir plate 48, the plate-making layer forming solution in the upstream coating solution reservoir 50 and the downstream coating solution reservoir 52 The liquid level can be kept constant. Therefore, since the surface of the second coating bar 42 is always kept wet, solid matter is not generated and attached to the grained surface Sg of the support web W.
[0081]
As described above, the coating apparatus according to Embodiment 1 can uniformly apply the plate-making layer forming liquid even when the traveling speed of the support web W is high, and the backside does not occur. The plate-making layer can be efficiently formed in the plate.
[0082]
【Example】
(Examples 1 and 2 and Comparative Examples 1 to 4)
One side of the aluminum web was grained according to a conventional method, and the grained surface was anodized to obtain a support web W.
[0083]
A photosensitive layer forming solution, which is an example of a plate making layer forming solution, was applied to the support web W using the coating apparatus 100 shown in FIG.
[0084]
The coating conditions for the photosensitive layer coating solution were as follows.
[0085]
a. Thickness of support web W
... 0.3mm
b. Travel speed of support web W
... 150m / min
c. Adhesion amount of photosensitive layer forming solution
... 50cc / min (coating liquid adhesion part 2)
... 15cc / min (adjustment application part 4)
d. Bar diameter: 10 mm (both first application bar 22 and second application bar 42)
e. Rotation speed (peripheral speed) of the first application bar 22
... 130m / min (forward)
f. Rotational speed (circumferential speed) of the second application bar 42
... 16m / min (forward)
g. Viscosity of photosensitive layer forming solution
... 20 mPa · s
h. The coating amount of the photosensitive layer forming solution after weighing with the second coating bar 42
The results are shown in Table 1.
[0086]
[Table 1]

As shown in Table 1, the height of the weir-like member 26 in the coating liquid adhering portion 2 is not less than the height of the lowest point of the first coating bar 22 and not more than the highest point of the first coating bar 22 −1 mm. In some cases, the photosensitive layer forming solution could be applied uniformly even though the running speed of the support web W was as fast as 150 m / min.
[0087]
On the other hand, when the height of the weir-like member 26 is lower than the height of the lowest point of the first application bar 22, an unapplied portion is generated, and the height of the weir-like member 26 is the first height. When the uppermost point of the coating bar 22 was higher than -1 mm, the back was generated.
[0088]
【The invention's effect】
As described above, according to the present invention, the coating apparatus having the bar and the coating method using the coating apparatus can provide a uniform coated surface even when the running speed of the substrate is high. Is done.
[Brief description of the drawings]
FIG. 1 is a schematic view showing the configuration of an example of a coating apparatus according to the present invention.
FIG. 2 is an enlarged view showing a relative relationship among heights of a first application bar, a support base, and a weir-like member in an application liquid adhering portion provided in the application apparatus shown in FIG.
FIG. 3 is an enlarged view showing a relative positional relationship among a first coating bar, a dam member, and a liquid surface of a plate-making layer forming liquid in a coating liquid adhering portion provided in the coating apparatus shown in FIG. 1; .
[Explanation of symbols]
2 Application liquid adhesion part
4 Adjustment application part
6 base
8 Lift platform
22 First application bar
24 Support member
26 Weir-shaped member
42 Second application bar
44 Support member

Claims (14)

A coating liquid adhering portion for adhering a coating liquid to at least one surface of the belt-like body that runs continuously; and a downstream side of the coating liquid adhering portion with respect to the running direction of the belt-like body; An adjustment application part that equalizes the coating liquid adhered to the belt-like body to a predetermined thickness,
The application liquid adhering portion includes a first application bar that rotates in the same direction as the travel direction of the strip, and an upstream side of the first application bar with respect to the travel direction of the strip. And a weir-like member that is disposed relative to each other and forms a liquid pool of the coating liquid between the first coating bar and the belt-like body and adheres the coating liquid to the belt-like body,
The height of the top surface of the weir-like member is not less than the height of the lowest point on the surface of the first application bar, and the height of the highest point on the surface of the first application bar is not more than -1 mm ,
The adjustment application unit includes a second application bar that rotates in the same direction as or opposite to the traveling direction of the strip, and the second application bar on the upstream side of the second application bar with respect to the traveling direction of the strip. An upstream weir member disposed relative to the bar, and a downstream side disposed relative to the second application bar on the downstream side of the second application bar with respect to the traveling direction of the strip. A weir-like member,
A coating liquid is formed by supplying a coating liquid between the second coating bar and the upstream weir member and between the second coating bar and the downstream weir member. apparatus. A coating liquid adhering portion for adhering a coating liquid to at least one surface of the belt-like body that runs continuously; and a downstream side of the coating liquid adhering portion with respect to the running direction of the belt-like body; An adjustment application part that equalizes the coating liquid adhered to the belt-like body to a predetermined thickness,
The application liquid adhering portion includes a first application bar that rotates in the same direction as the travel direction of the strip, and an upstream side of the first application bar with respect to the travel direction of the strip. And a weir-like member that is disposed relative to each other and forms a liquid pool of the coating liquid between the first coating bar and the belt-like body and adheres the coating liquid to the belt-like body,
The distance between the surface facing the first application bar in the dam member and the outer peripheral surface of the first application bar is 3 mm or more ,
The adjustment application unit includes a second application bar that rotates in the same direction as or opposite to the traveling direction of the strip, and the second application bar on the upstream side of the second application bar with respect to the traveling direction of the strip. An upstream weir member disposed relative to the bar, and a downstream side disposed relative to the second application bar on the downstream side of the second application bar with respect to the traveling direction of the strip. A weir-like member,
A coating liquid is formed by supplying a coating liquid between the second coating bar and the upstream weir member and between the second coating bar and the downstream weir member. apparatus. A coating liquid adhering portion for adhering a coating liquid to at least one surface of the belt-like body that runs continuously; and a downstream side of the coating liquid adhering portion with respect to the running direction of the belt-like body; An adjustment application part that equalizes the coating liquid adhered to the belt-like body to a predetermined thickness,
The application liquid adhering portion includes a first application bar that rotates in the same direction as the travel direction of the strip, and an upstream side of the first application bar with respect to the travel direction of the strip. And a weir-like member that is disposed relative to each other and forms a liquid pool of the coating liquid between the first coating bar and the belt-like body and adheres the coating liquid to the belt-like body,
The height of the top surface of the weir-like member is not less than the height of the lowest point on the surface of the first application bar, and the height of the highest point on the surface of the first application bar is not more than -1 mm,
The distance between the surface facing the first application bar in the dam member and the outer peripheral surface of the first application bar is 3 mm or more ,
The adjustment application unit includes a second application bar that rotates in the same direction as or opposite to the traveling direction of the strip, and the second application bar on the upstream side of the second application bar with respect to the traveling direction of the strip. an upstream weir member disposed relative to the bar, the downstream side of the second coating bar with respect to the running direction of the strip, said second coating downstream arranged relative to the bar A side weir member,
A coating liquid is formed by supplying a coating liquid between the second coating bar and the upstream weir member and between the second coating bar and the downstream weir member. apparatus. The peripheral speed of the second application bar is smaller than the peripheral speed of the first application bar when the second application bar included in the adjustment application unit rotates in the same direction as the travel direction of the strip. The coating apparatus according to any one of -3.   5. The coating apparatus according to claim 1, wherein the upstream weir member and the downstream weir member included in the adjustment application unit are each bent at the upper end toward the second application bar. . The coating apparatus according to claim 2 or 3, wherein a distance between a surface of the dam-like member facing the first coating bar and an outer peripheral surface of the first coating bar is 3 to 30 mm. The coating device according to any one of claims 1 to 6, wherein a peripheral speed of the first coating bar is in a range of the same speed as a traveling speed of the belt-like body to 1/15 of the traveling speed. The coating apparatus according to any one of claims 1 to 7, wherein a traveling speed of the band-shaped body is 100 m / min or more. The coating apparatus according to any one of claims 1 to 8, wherein a traveling speed of the strip is 100 to 200 m / min, and a viscosity of the coating liquid is 50 mPa · s or less. The coating apparatus according to any one of claims 1 to 9, wherein the strip is a support for a lithographic printing plate. The coating apparatus according to claim 10, wherein the coating liquid is a plate making layer forming liquid for forming a plate making layer in a lithographic printing plate. The strip is an aluminum support that is a base of a lithographic printing plate, and the coating solution is selected from a photosensitive layer forming solution and a heat-sensitive layer forming solution, and forms a plate making layer of the lithographic printing plate. The coating apparatus according to claim 10 or 11. A coating liquid adhesion process for depositing the coating liquid on at least one surface of the continuously running belt-like body, and an adjustment coating process for equalizing the coating liquid deposited on the belt-like body in the coating liquid deposition process to a predetermined thickness. And
In the coating liquid adhering step, the first application bar that rotates in the same direction as the travel direction of the belt-like body, and the first application bar upstream of the first application bar with respect to the travel direction of the belt-like body. The height of the top surface is equal to or higher than the height of the lowest point on the surface of the first application bar, and is higher than the height of the highest point on the surface of the first application bar. Forming a liquid pool of the coating liquid between the weir-like member having a height of 1 mm or more and the strip, and allowing the coating liquid to adhere to the strip;
In the adjustment coating step, the second coating bar that rotates in the same direction as or opposite to the traveling direction of the strip, and the second coating bar upstream of the second coating bar with respect to the traveling direction of the strip. An upstream weir member disposed relative to the coating bar, and a downstream disposed relative to the second coating bar on the downstream side of the second coating bar with respect to the traveling direction of the strip A coating method, wherein a liquid pool is formed by supplying a coating liquid between the side weir members . A coating liquid adhesion process for depositing the coating liquid on at least one surface of the continuously running belt-like body, and an adjustment coating process for equalizing the coating liquid deposited on the belt-like body in the coating liquid deposition process to a predetermined thickness. And
In the coating liquid adhering step, the first application bar that rotates in the same direction as the travel direction of the belt-like body, and the first application bar upstream of the first application bar with respect to the travel direction of the belt-like body. Between the weir-like member having a distance of 3 mm or more between the surface on the side facing the first application bar and the outer peripheral surface of the first application bar, and the belt-like body Forming a liquid pool of coating liquid, attaching the coating liquid to the strip ,
In the adjustment coating step, a second coating bar you rotate in the traveling direction in the same or opposite direction of the strip, on the upstream side of the second coating bar with respect to the traveling direction of the strip, said first An upstream weir member disposed relative to the application bar, and disposed downstream of the second application bar with respect to the traveling direction of the strip, relative to the second application bar. A coating method comprising: supplying a coating liquid between the downstream weir-like member and forming a liquid pool .

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