JP4352639B2 - Coating device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating apparatus that uniformly and thinly coats a traveling flexible belt-like support with a gel or liquid coating solution made of an organic or inorganic material or a composite thereof.
[0002]
[Prior art]
In general, as a coating apparatus that forms a thin layer by thinly coating a coating solution on the surface of a flexible belt-like support such as a long film or sheet, for example, Japanese Patent Publication No. 6-77712 (hereinafter referred to as the first). (Referred to as prior art).
[0003]
The coating apparatus shown in the first prior art has a coating head as shown in FIG. 4, and the coating head forms a first slot 1, a back edge 2 and a first doctor edge 3, and the first doctor. The second doctor edge 5 that forms the second slot 4 together with the edge 3 is provided.
[0004]
Inside the coating head, pockets 6a and 6b having a substantially circular cross section communicating with the first slot 1 and the second slot 4 are formed. Then, the coating liquid is fed from the liquid supply means (not shown) through the pipes 7a and 7b in the arrow directions B1 and B2, respectively, and is stored in the pockets 6a and 6b. The two slots 4 are pushed out to the respective outlets and discharged in the arrow directions C1 and C2.
[0005]
The flexible belt-like support 8 is moved in the direction of the arrow A from the back edge 2 side toward the back edge 2, the first doctor edge 3, and the second doctor edge 5 by feeding means of the flexible belt-like support 8 (not shown). It is supposed to run on.
[0006]
When the flexible belt-like support 8 is running, the first coating liquid 91 in the pocket 6a is discharged from the first slot 1 and applied to one surface of the flexible belt-like support 8 as shown in FIG. The Thereafter, the second coating liquid 92 that is located downstream of the flexible belt-like support 8 in the traveling direction and is pushed out from the pocket 6 b to the outlet of the second slot 4 is the first coating liquid 91. Overpainted on top. As described above, when the flexible belt-like support 8 is running, the coating liquids 91 and 92 are discharged back and forth, and the two layers of the coating liquids 91 and 92 are applied to the flexible belt-like support 8.
[0007]
The coating liquid contains hard dispersed particles made of inorganic substances and various additives such as resins and solvents, and wear and corrosion are remarkable. Back edge 2, first doctor edge 3, second doctor Edge 5 such as edge 5 is formed of a cemented carbide having high rigidity, wear resistance, and corrosion resistance, and maintains a shape accuracy and surface accuracy of the tip, and a uniform film thickness can be obtained with respect to the formed thin layer. It is supposed to be configured.
[0008]
[Problems to be solved by the invention]
By the way, how to separate the coating liquid from the edge (hereinafter sometimes referred to as the final edge in the specification) arranged last along the running direction of the flexible belt-like support is unstable (for example, FIG. 5). When the coating amount per unit time is uneven, the thin layer formed on the flexible belt-like support is as follows. The film has a non-uniform film thickness in the running direction. In particular, under conditions where the film thickness is reduced and coating is performed at a high speed, there is a drawback that it is difficult to control the flow of the coating liquid.
In addition, even when the tip of the coating head is provided with an edge made of cemented carbide as described above, a coating head having a plurality of slits as described above is used in accordance with the demand for a multilayer coating structure. As a result, the rigidity, wear resistance, and corrosion resistance are not yet sufficient due to the thinning of coating films, high speed coating, and the increase in coating area. . For this reason, there has been a problem that the shape of the tip of the edge changes, and coating with high film thickness accuracy cannot be performed over a long period of time.
[0009]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a coating apparatus capable of coating a uniform thin coating film at high speed over a long period of time.
[0010]
[Means for Solving the Problems]
In the case where the inventor has an edge provided at the tip of the coating head, in particular, when the coating head includes a plurality of edges for coating a plurality of coating liquids while laminating, a flexible strip-shaped support is moved in the running direction. The tip of the last edge, which is the last edge arranged along the edge, more specifically, for example, two edges of the back edge and the doctor edge are sequentially arranged along the running direction of the flexible belt-like support body In the coating head, the tip of the doctor edge, and for example, the three edges of the back edge, the first doctor edge, and the second doctor edge are arranged in order along the running direction of the flexible belt-like support. The tip of the second doctor edge is formed on the side facing the flexible belt-like support, while the back surface is formed on the downstream side in the running direction. A chamfer or roundness of 0.01 mm or less is formed at the corner of the intersecting region, and the coating liquid applied at the corner is uniformly leveled, and further, it is separated from the coating head downstream in the running direction. The smoother tip surface is formed on the side facing the flexible belt-like support of the smoother edge provided on the tip side of the smoother that is arranged, while the smoother back surface is formed on the downstream side in the running direction. Apply a uniform thickness by forming a chamfer or roundness of 0.01 mm or less at the corner of the intersecting area between the surface and the back of the smoother, and evenly leveling the coating liquid applied at this corner. In addition, at least the end of the final edge and the tip of the smoother edge of the coating head edge are made of a cemented carbide containing tungsten carbide as a main component. The binder phase metal having a predetermined component is uniformly blended between the particles of Nungsten to increase the hardness and toughness, and the tungsten carbide particles are subjected to high-temperature heat treatment to increase the bonding force between the tungsten carbide particles. The addition of a grain growth inhibitor that suppresses the growth and the average particle size of tungsten carbide is sufficiently small, so that the wear resistance and corrosion resistance of the final edge and smoother edge are improved, and the tip portion due to chipping, wear, and corrosion is improved. Obtaining the knowledge that the coating liquid can be applied while reducing the shape change and keeping the film thickness constant over a long period of time has led to the present invention.
[0012]
That is , the present invention includes a coating head for applying a coating liquid on a flexible belt-like support that runs in one direction, and the coating heads are sequentially arranged in the running direction of the flexible belt-like support. In addition, a slot is formed between each adjacent edge, and the coating liquid flows toward the flexible belt-like support, and is opened at the tip of the coating head. The coating liquid flows out from the outlet, and is applied to the flexible belt-like support, and the coating head is disposed downstream of the coating head along the traveling direction of the flexible belt-like support. An applicator having a smoother that is disposed away from the front end and smoothes the coating liquid applied to the flexible strip-shaped support by bringing the tip side into contact with the flexible strip-shaped support The application head A distal end surface is formed on the side of the final edge disposed last along the traveling direction on the side facing the flexible belt-like support, and a back surface is formed on the downstream side of the final edge along the traveling direction. A smoother edge is provided at the tip of the smoother, and the smoother edge is substantially flat along the traveling direction on the side facing the flexible belt-like support, and is pushed against the flexible belt-like support. A smoother tip surface to be applied is formed, a smoother back surface is formed on the downstream side of the smoother edge along the traveling direction, and a corner portion of an intersection region between the tip surface of the final edge and the back surface; and the corners of the intersections of the smoothers and back smoother tip surface, characterized in that the 0.01mm following chamfered or rounded over 0.003mm are formed
[0013]
In the present invention, the tip surface pressed against the flexible belt-like support at the final edge is sharply terminated by the back surface at the corner portion where chamfering or rounding of 0.003 mm to 0.01 mm is formed. It is configured. Further , a smoother for leveling the coating liquid applied to the flexible band-shaped support is disposed downstream of the coating head for applying the coating liquid on the flexible band-shaped support, and the smoother is disposed on the tip side of the smoother. The tip of the smoother that is pressed against the flexible belt-like support of the smoother edge provided is configured to be sharply terminated by the back of the smoother at the corner where a chamfer or roundness of 0.003 mm or more and 0.01 mm or less is formed. Has been. For this reason, the coating liquid does not flow around to the back side, and the coating liquid is uniformly leveled at the sharply formed corners, so that the coating liquid is uniformly formed on the flexible belt-like support. Can be applied. That is, when a thin layer of, for example, 5 μm or less is formed on the flexible belt-like support, the film thickness deviation can be suppressed to 10% or less.
[0016]
In the coating apparatus of the present invention, at least the tip of the final edge and the tip of the smoother edge among the edges of the coating head are 4 to 20% by weight of cobalt and 0.3 to 3 of chromium. 0.0% by weight and / or 0.1 to 3.0% by weight of vanadium, and the balance is formed of a cemented carbide composed of tungsten carbide having an average particle size of 1 μm or less and inevitable impurities. And
[0017]
In the present invention, since the hard phase of the cemented carbide forming the final edge or smoother edge is made of tungsten carbide, at least the toughness and strength of the final edge can be improved. Here, since tungsten carbide is a cubic structure compound, it is preferable to suppress the decrease in strength of the cemented carbide by setting the average particle size to 1 μm or less, and further, the particle size of tungsten carbide is made as uniform as possible. In addition, it is desirable to uniformly disperse in the binder phase in order to improve the strength and toughness of the edge.
Further, when the cobalt forming the binder phase of the cemented carbide forming the edge is less than 4% by weight, the edge toughness is lost, and when it exceeds 20% by weight, the wear resistance of the edge is significantly deteriorated. It is preferably 20% by weight.
Further, in order to enhance the corrosion resistance of the edge, and further to suppress the grain growth of tungsten carbide under a high temperature heat treatment that enhances the bonding force between the tungsten carbide particles, the cemented carbide forming the edge is made of at least chromium and vanadium. It is preferable that one or both are included. Here, if chromium is less than 0.3% by weight, corrosion resistance is not obtained, and if it exceeds 3.0% by weight, a harmful layer of chromium carbide is deposited, so 0.3 to 3.0% by weight is assumed. In addition, when vanadium is less than 0.1% by weight, corrosion resistance cannot be obtained, and when it exceeds 3.0% by weight, a harmful layer of vanadium carbide is deposited. It is preferably 0% by weight.
In this way, at least the wear resistance and corrosion resistance of the final edge can be increased to reduce the shape change of the tip portion due to chipping, wear and corrosion, and the coating liquid can be applied with a uniform thickness over a long period of time.
[0018]
In the coating apparatus of the present invention, it is preferable that the cemented carbide has a hardness of 90.0 (HRA) or more on the A scale of Rockwell hardness. Furthermore, it is preferable that the cemented carbide is produced by performing a HIP process.
Thereby, the shape change of the front-end | tip part can be reduced over a long period of time, and a coating liquid can be apply | coated with uniform thickness.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a coating apparatus according to the present invention will be described with reference to the drawings. The coating apparatus of the present invention relates to a coating apparatus that forms a thin layer by uniformly coating a coating liquid on the surface of a flexible belt-like support such as a film or sheet that travels in one direction. There are no particular restrictions on usage.
[0020]
1 to 3 show an embodiment of a coating apparatus according to the present invention. In the drawing, the coating apparatus has a coating head 10, and the coating head 10 forms a second slot 12 together with a back edge 13 and a first doctor edge 14 that form a first slot 11, and a first doctor edge 14. A second doctor edge 15 (final edge) is provided. As shown in FIG. 3, a smoother 30 is disposed on the downstream side of the coating head 11 along the traveling direction of the flexible belt-like support 19 so as to be separated from the coating head 11. Further, the coating apparatus has a feeding means (not shown) for feeding the flexible belt-like support body 19 in the arrow direction A.
[0021]
The back edge 13, the first and second doctor edges 14, 15 constituting the coating head 10 are sequentially arranged along the traveling direction A of the flexible belt-like support 19, and the back is made of a cemented carbide at the tip. An edge tip 16, a first doctor edge tip 17, and a second doctor edge tip 18 (final edge) are respectively mounted. On the side of the second doctor edge tip 18 facing the flexible belt-like support 19, a tip surface 18a having a substantially flat downstream portion along the traveling direction A is formed, and the second doctor edge A flat back surface 18 b is formed on the downstream side along the traveling direction A of the tip 18.
Further, a smoother edge 31 made of cemented carbide is attached to the tip of the smoother 30. On the side of the smoother edge 31 facing the flexible belt-like support 19, a smoother tip surface 31 a having a substantially flat downstream portion along the running direction A is formed, and the running direction of the smoother edge 31. A flat smoother back surface 31 b is formed on the downstream side along A.
The corner 18c of the intersecting region of the tip surface 18a and the back surface 18b of the second doctor edge tip 18 and the corner 31c of the intersecting region of the smoother tip surface 31a and the smoother back surface 31b are defined in JIS B 0701. The chamfer or roundness is formed to be 0.003 mm to 0.01 mm.
[0022]
Here, the cemented carbide forming the back edge tip 16, the first and second doctor edge tips 17, 18 and the smoother edge 31 is 4 to 20% by weight of cobalt and 0.3 to 3.0% of chromium. It is composed of tungsten carbide with 0.1% to 3.0% by weight of vanadium and / or vanadium, and the balance of unavoidable impurities with an average particle size of 1 μm or less. This cemented carbide is produced by performing a hot isostatic pressing (HIP) process in which sintering is performed at a high temperature and a high pressure, and the hardness is 90.0 (HRA) or more on the A scale of Rockwell hardness. 93.0 (HRA) or less.
[0023]
Further, the cutting edge 16c at the downstream end along the traveling direction A of the back edge tip 16 is formed so as to have a straightness tolerance of 0.5 μm or more to 3 μm or less as defined in JIS B 0021. That is, a region sandwiched between two parallel straight lines when the blade edge 16c is projected onto a plane in a direction along the tip surface 16a or the slot side surface 16b is defined as a tolerance region, and the tip surface 16a and the slot side surface 16b Even if the cutting edge 16c is projected onto a plane in any direction, the width of the tolerance zone is formed to be 0.5 μm to 3 μm.
[0024]
In the coating apparatus, when the flexible belt-like support 19 is running, the coating liquids 20A and 20B are supplied by liquid supply means (not shown), and the coating liquids 20A and 20B are pockets 21 and 22, the first slot 11 and the second slot. 12, the coating liquids 20 </ b> A and 20 </ b> B are applied so as to overlap each other on one side of the flexible belt-like support 19.
In this example, the coating liquid in this case is for forming a base material sheet used for a green sheet of a multilayer ceramic capacitor. For example, the liquid containing dielectric ceramic powder and its composition were slightly changed. It consists of two types such as dielectric containing liquid.
[0025]
In the coating apparatus having such a configuration, when the flexible belt-like support body 19 travels, the coating liquids 20A and 20B are respectively supplied by the liquid supply means, and the coating liquids 20A and 20B are supplied to the pockets 21 and 22 and the first slot. 11, flows through the second slot 12, is discharged from the respective outlets in the directions of arrows C 1 and C 2 in the figure, and is applied to one side of the flexible belt-like support 19. In this case, the coating liquid 20A and the coating liquid 20B are applied on one surface of the flexible belt-like support 19 in a state where they are sequentially overlapped.
[0026]
At this time, the tip surface 18a of the second doctor edge tip 18 is configured to be sharply terminated at a corner portion 18c having a chamfer or roundness of 0.01 mm or less, so that the coating liquids 20A and 20B are The coating liquid 20A, 20B is uniformly leveled at the corners 18c without going around the back surface 18b, so that the coating liquid can be applied on the flexible belt-like support 19 with a uniform film thickness.
Furthermore, the coating liquids 20 </ b> A and 20 </ b> B applied to the flexible belt-shaped support 19 are more evenly distributed by the smoother 30 disposed on the downstream side of the coating head 10. That is, since the smoother tip surface 31a of the smoother edge 31 provided at the tip of the smoother 30 is configured to be sharply terminated at a corner portion 31c having a chamfer or roundness of 0.01 mm or less. The liquids 20A and 20B do not wrap around the smoother back surface 31b, and the coating liquids 20A and 20B are uniformly leveled at the corners 31c, so that the coating liquid 20A has a uniform thickness on the flexible belt-like support 19. , 20B can be applied.
In this way, when a thin layer of, for example, 5 μm or less is formed on the flexible belt-like support 19, the deviation in film thickness can be suppressed to 10% or less.
[0027]
Here, the back edge tip 16, the first and second doctor edge tips 17, 18, and the smoother edge 31 are 4 to 20% by weight of cobalt, 0.3 to 3.0% by weight of chromium, and / or vanadium. 0.1 to 3.0% by weight, and the balance is made of cemented carbide made of tungsten carbide and inevitable impurities with an average particle size of 1 μm or less, so that deformation of the edge is suppressed and flexibility is achieved. The coating liquid 20 </ b> A and the coating liquid 20 </ b> B can be uniformly coated on the conductive belt-like support 19. Further, the wear resistance and corrosion resistance of the back edge tip 16, the first and second doctor edge tips 17, 18 and the smoother edge 31 are increased to reduce the shape change of the tip portion due to chipping, wear and corrosion, and for a long period of time. The coating liquid can be applied with a uniform thickness.
[0028]
Thus, according to the present embodiment, the two coating liquids 20A and 20B can be uniformly and stably applied to the flexible belt-like support body 19, and the two uniform thin film layers without unevenness. Can be definitely obtained.
[0029]
In the present embodiment, the coating apparatus is configured to have a smoother, and has a configuration in which a sharp corner is provided on the downstream side in the running direction of the flexible belt-like support on both the final edge and the smoother edge of the coating head. However, it may be provided on either side.
In the present embodiment, the coating apparatus is a three-block type coating apparatus having three edges. However, in the two-block type coating apparatus including two edges, that is, the back edge and the doctor edge, the doctor edge is the above-described doctor edge. It is good also as a structure similar to a 2nd doctor edge.
[0030]
【The invention's effect】
The present invention has the following effects.
According to the first aspect of the present invention, the chamfer or roundness of 0.003 mm or more and 0.01 mm or less is formed in the corner on the downstream side along the traveling direction of the final edge or the smoother edge. The coating liquid can be applied with a uniform film thickness on the conductive belt-like support.
[0031]
According to the second aspect of the present invention, the wear resistance and corrosion resistance of the final edge and the smoother edge are improved to reduce the shape change of the tip portion due to chipping, wear and corrosion, and the uniform thickness over a long period of time. The coating liquid can be applied with.
[0032]
Further, according to the invention described in claim 3 , it is possible to apply the coating liquid with a uniform thickness while reducing the shape change of the tip portion over a longer period of time.
[0033]
Further, according to the invention described in claim 4 , it is possible to reduce the shape change of the tip portion over a longer period of time and apply the coating liquid with a uniform thickness.
[Brief description of the drawings]
FIG. 1 is a view showing an embodiment of a coating apparatus according to the present invention, and is a perspective view of a coating head constituting the coating apparatus.
FIG. 2 is an enlarged view showing a portion of a coating head of a coating apparatus according to the present invention, and is an explanatory view showing a relationship between the coating head and a flexible belt-like support.
FIG. 3 is a view showing a positional relationship between a coating head and a smoother of the coating apparatus according to the present invention.
FIG. 4 is a schematic view showing a conventional coating apparatus.
FIG. 5 is an explanatory view showing problems in a conventional coating apparatus.
[Explanation of symbols]
11 ... 1st slot 12 ... 2nd slot 13 ... Back edge 14 ... 1st doctor edge 15 ... 2nd doctor edge (final edge)
16 ... Back edge tip 17 ... First doctor edge tip 18 ... Second doctor edge tip (final edge)
18a ... tip surface 18b ... back surface 18c ... corner 19 ... flexible belt-like supports 20A, 20B ... coating solution 30 ... smoother 31 ... smoother edge 31a ... smoother tip 31b ... smoother back 31c ... corner

Claims (4)

A coating head for applying a coating solution on a flexible belt-like support traveling in one direction, the coating head having at least two edges sequentially arranged in the running direction of the flexible belt-like support; And a slot through which the coating liquid flows toward the flexible belt-like support is formed between adjacent edges, and the coating is applied from an outlet opening at the tip of the coating head. Each of the liquids flows out and is applied to the flexible strip support, and is arranged on the downstream side of the coating head along the traveling direction of the flexible strip support and spaced from the coating head. And a smoothing device for smoothing the coating liquid applied to the flexible belt-like support by bringing the tip side into contact with the flexible belt-like support,
A tip end surface is formed on the side of the last edge of the coating head that is disposed last along the traveling direction on the side facing the flexible belt-like support, and on the downstream side of the final edge along the traveling direction. A back surface is formed, and a smoother edge is provided on the front end side of the smoother. The smoother edge is substantially flat along the running direction on the side of the smoother edge facing the flexible belt-like support, A smoother tip surface pressed against the support is formed, and a smoother back surface is formed downstream of the smoother edge along the traveling direction,
Chamfering or rounding of 0.003 mm or more and 0.01 mm or less is formed at the corner of the intersection region between the tip surface and the back surface of the final edge and the corner of the intersection region between the tip surface of the smoother and the back surface of the smoother. An applicator characterized by being made. The coating apparatus according to claim 1 ,
Of the edges of the coating head, at least the tip of the final edge and the tip of the smoother edge are 4 to 20% by weight of cobalt, 0.3 to 3.0% by weight of chromium and / or vanadium. An applicator characterized in that it is made of a cemented carbide made of tungsten carbide and inevitable impurities having an average particle size of 0.1 to 3.0% by weight and the balance being 1 μm or less. The coating apparatus according to claim 2 ,
2. The coating apparatus according to claim 1, wherein the cemented carbide has a hardness of 90.0 (HRA) or higher on the A scale of Rockwell hardness. The coating apparatus according to claim 2 , wherein the cemented carbide is subjected to HIP treatment.

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