JP6788234B2 - Die coater - Google Patents

Description

The present invention relates to a die coater.

The die coater continuously discharges the coating liquid that has passed through the die from the lip and supplies it to the surface of the traveling base material (see, for example, Patent Document 1). If a central block that isolates the coating liquids from being mixed is provided, a plurality of coating liquids can be supplied at the same time to form a multilayer film. The die coater is used in various production lines, such as applying a dielectric of a ceramic capacitor to the surface of a carrier film and applying an active material of a secondary battery to the surface of a current collector foil.

Japanese Unexamined Patent Publication No. 2006-181453

In some production lines, there is a desire to form as thin a coating as possible. For example, in a ceramic capacitor, the thinner the dielectric, the narrower the distance between the electrodes and the larger the capacitance. Further, the thinner the dielectric, the larger the number of laminated dielectrics, the larger the electrode area, and the larger the capacitance. However, it has been found that when a thin film having a Wet film thickness of 10 μm or less is formed in a die coater, a new problem arises in which the shape accuracy of the lip edge affects the coating film.

We would like to improve the processing accuracy of the edge in order to suppress the variation in film thickness caused by the shape accuracy of the edge. When the processing accuracy of the edge is important, a material having excellent sharpness is preferable. Materials such as stainless steel have limited processing accuracy because their corners are slightly rounded (sagging) due to grinding. On the other hand, in the case of cemented carbide, the processing accuracy can be brought close to the scale of the particle size of the metal carbides constituting the cemented carbide by grinding. In order to form a coating film as thin as possible, a die coater having a structure in which a cemented carbide chip and a block body made of an easy-to-process material having excellent dimensional stability are combined is preferable.

Generally, in a die coater having such a structure, the tip seat of the block body that supports the carbide tip is formed by cutting. When grinding a carbide tip integrated with a block body, if the surface roughness of the joint surface is large, the relative position between the carbide tip and the block body may be slightly displaced. When emphasizing the processing accuracy of the edge, it is conceivable to grind not only the edge but also the joint surface between the carbide tip and the block body.

However, coating liquids having different viscosities and pressures flow on one side and the other side of the central block that isolates the coating liquids from being mixed. Since the force pressing toward the low pressure side acts on the carbide tip, the base end of the carbide tip is formed so as to be inclined diagonally with respect to the reference surface (bottom surface) of the block body so as to bite into the tip seat of the block body. It was fixed (see, for example, FIG. 4 of Patent Document 1). When grinding a tip seat that is tilted diagonally with respect to the reference plane, it is necessary to use a jig for adjusting the angle. When a jig is used, an artificial error when manually installing the jig is included in the processing accuracy of the die coater, which is a workpiece. In addition, the accuracy of the jig itself is included in the processing accuracy of the die coater.

In order to improve the machining accuracy of the edge, we want to maximize the machining accuracy of the machine tool by omitting the jig that adjusts the angle as much as possible. Therefore, an object of the present invention is to provide a die coater capable of forming a thin film having excellent processing accuracy at an edge and excellent smoothness.

The die coater according to one aspect of the present invention simultaneously supplies a plurality of coating liquids to a base material to form a multilayer film on the surface of the base material. The die coater includes a first block in which a liquid pool chamber to which the first liquid is supplied is formed, a second block in which a liquid pool chamber to which the second liquid is supplied is formed, and the first block and the second block. It has a central block sandwiched between them. The central block constitutes a discharge port from which the first liquid is discharged from the first block. The central block is formed in a wedge shape in which a chip facing the base material and a block body formed of a material different from the chip and holding the chip are combined. The central block includes a first side surface facing the first block, a second side surface in which the distance between the first side surface becomes narrower toward the base material, and a first reference surface formed at right angles to the first side surface. It has a second reference plane formed at right angles to the second side surface. The chip has a first seating surface formed parallel to the first reference plane and a second seating surface formed parallel to the second reference plane. The block body has a first reference plane and a second reference plane, and is formed parallel to the first reference plane and the first grinding surface that abuts on the first seating plane and the second reference plane. It further has a second ground surface that comes into contact with the second seating surface. The surface roughness of the first ground surface and the second ground surface is formed to have a maximum height Rz = 6.3 or less according to JIS B 0601: 2013.

According to this aspect, since the surface roughness of the first ground surface and the second ground surface is Rz = 6.3 or less, the contact condition between the tip and the block body changes when the edge is machined, and the surface roughness thereof is changed. It is possible to prevent the positional relationship from shifting. When the work is fixed using a jig that adjusts the angle, the processing accuracy of the chip or block body, which is the work, includes an artificial error when the jig is manually installed. In addition, the dimensional error of the jig itself is included in the processing accuracy of the chip or block body. However, according to this embodiment, it is not necessary to use a jig for adjusting the angle. The first grinding surface can be processed in a posture in which the first reference surface is placed on the stage of a machine tool such as a surface grinder, and the second grinding surface can be processed in a posture in which the second reference surface is placed. As a result, the machining accuracy at the edge can be improved.

In the above embodiment, the chip may be formed of cemented carbide and the block body may be formed of stainless steel.

According to this aspect, since it is formed of a cemented carbide having excellent cutting edge properties, it is possible to form an edge having excellent dimensional accuracy. Since the block body is made of stainless steel, a female screw can be provided to fix the first block and the second block. It has excellent corrosion resistance and can be used for various coating liquids.

In the above aspect, the intersection angle between the first side surface and the second side surface may be 20 to 35 degrees.

The die coater is repeatedly disassembled and cleaned. According to this aspect, in the state of a semi-finished product in which the first block or the second block is assembled to the central block, the semi-finished product can be made to stand on its own with the first reference plane or the second reference plane as the bottom surface. In the state of the finished product in which the first block, the second block and the central block are assembled, the finished product can be made to stand on its own with the first reference surface as the bottom surface, and the finished product can be made with the second reference surface as the bottom surface. It can also be self-reliant. A die coater with excellent maintainability can be configured. Since the work can be placed on the stage of the machine tool independently in either the posture with the first reference plane on the bottom or the posture with the second reference plane on the bottom, the work is tilted and the position is set. There is no deviation. It is possible to provide a die coater with excellent processing accuracy. At the time of coating, it is necessary to sufficiently retract the non-lip portion from the base material, and in the present embodiment, the non-lip portion is less likely to come into contact with the coating film. Further, according to this aspect, since a sufficient contact area between the chip and the block body can be secured, the first seating surface and the second seating surface of the chip are relative to the first reference surface and the second reference surface of the block body. Even if they are parallel, there is little risk of the chips falling over. If the intersection angle between the first side surface and the second side surface is narrow, the contact area between the chip and the block body is insufficient, and the pressure between the first liquid flowing on the first side surface and the second liquid flowing on the second side surface is insufficient. When the difference is large, the tip may fall to the low pressure side.

According to the present invention, it is possible to provide a die coater capable of forming a thin film having excellent processing accuracy at an edge and excellent smoothness.

FIG. 1 is a cross-sectional view of the die coater according to the embodiment of the present invention cut along the transport direction of the base material. FIG. 2 is a perspective view showing a partially disassembled die coater shown in FIG. FIG. 3 is an enlarged cross-sectional view of the lip shown in FIG. FIG. 4 is a cross-sectional view of the central block shown in FIG.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings. In each figure, those having the same reference numerals have the same or similar configurations. In the die coater 1 of the embodiment of the present invention, the first grinding surface B1 of the block body 31 is perpendicular to the first side surface X1 in order to improve the processing accuracy of the edge of the lip, particularly the edges 331 and 332 of the central lip 33. One of the features is that the second grinding surface B2 is formed at a right angle to the second side surface X2. However, the right angle in the present specification is the result of processing at a right angle using a machine tool such as a surface grinder, and may include an error in the processing accuracy of the machine tool. Specifically, it includes not only strictly 90 degrees, but also a range of, for example, 89 degrees 50 minutes to 90 degrees 10 minutes, taking into account a machine tool error of about 10 minutes.

In order to make the metal blocks 10, 20, and 30 self-supporting, the first reference surface A1 was formed at right angles to the first side surface X1, and the second reference surface A2 was formed at right angles to the second side surface X2. When the first grinding surface B1 is perpendicular to the first side surface X1, the first reference surface A1 and the first grinding surface B1 are parallel to each other. When the second grinding surface B2 is perpendicular to the second side surface X2, the second reference surface A2 and the second grinding surface B2 are parallel to each other. Therefore, the first and second grinding surfaces B1 and B2 can be ground without adjusting the angles with respect to the first and second reference surfaces A1 and A2. Since the jig for adjusting the angle can be omitted, the first and second grinding surfaces B1 and B2 can be machined on a scale of machining accuracy of a machine tool such as a surface grinder.

Further, the die coater 1 of the present embodiment has the first side surface X1 so that it can stand on its own in either the state of the finished product or the state of the semi-finished product in which the upstream block 10 or the downstream block 20 is removed from the finished product. The intersection angle between the surface and the second side surface X2 is adjusted to the range of 20 to 35 degrees. If the metal blocks 10, 20 and 30 have an unstable shape that cannot stand on the stage of a machine tool, they may move due to a trivial trigger and cannot be processed precisely. According to the present embodiment, the metal blocks 10, 20 and 30 have a self-supporting shape, and the die coater 1 having excellent processing accuracy can be provided. Hereinafter, each configuration will be described in detail with reference to FIGS. 1 to 4.

FIG. 1 is a cross-sectional view of the die coater 1 according to the embodiment of the present invention, which is cut along the transport direction MD of the base material W and viewed from the width direction TD of the base material W. FIG. 2 is a perspective view showing a partially disassembled die coater 1 shown in FIG. As shown in FIGS. 1 and 2, the die coater 1 is composed of metal blocks 10, 20, 30, ... Of several pieces called dies. Each of the metal blocks 10, 20, 30, ... Is formed in a polygonal columnar shape extending along the width direction TD of the base material W.

The die coater 1 continuously discharges the coating liquid that has passed through the metal blocks 10, 20, 30, ... From the discharge ports of the lips 13, 23, 33, ... Formed at the tip of the metal block, and is flexible and continuous. It is supplied to the surface of the base material (web) W of the body. The die coater 1 in which a plurality of discharge ports are formed can simultaneously supply a plurality of coating liquids to the base material W to form a multilayer film on the surface of the base material W. For example, an undercoat layer that improves adhesion to the base material W can be formed at the same time as the functional film, or an overcoat layer that covers the functional film can be formed at the same time as the functional film.

In the example shown in FIG. 1, the die coater 1 includes an upstream block 10, a downstream block 20, and a central block 30. In the transport direction MD of the traveling base material W, the upstream side block 10 is arranged so as to be on the upstream side, and the downstream side block 20 is arranged so as to be on the downstream side. The central block 30 is arranged so as to be sandwiched between the upstream block 10 and the downstream block 20.

The central block 30 has a first side surface X1 and a second side surface X2 whose distance between the first side surface X1 becomes narrower toward the base material W, and the intersection angle between the first side surface X1 and the second side surface X2. Is formed in a wedge shape of 20 to 35 degrees. The central block 30 further has first and second reference planes A1 and A2 connecting between the first and second side surfaces X1 and X2 on the side opposite to the base material W. The first side surface X1 faces the upstream side block 10, and the second side surface X2 faces the downstream side block 20.

The upstream block 10 has a third side surface X3 extending along the first side surface X1 and a fifth side surface X5 opposite to the third side surface X3. The third and fifth side surfaces X3 and X5 extend in parallel. The upstream block 10 further has a third reference plane A3 formed at right angles to the third and fifth side surfaces X3 and X5. The first reference plane A1 of the central block 30 is formed flush with the third reference plane A3 of the upstream block 10. That is, the first reference plane A1 is formed at a right angle to the first side surface X1.

Similarly, the downstream block 20 has a fourth side surface X4 extending along the second side surface X2 and a sixth side surface X6 opposite to the fourth side surface X4. The fourth and sixth sides X4 and X6 extend in parallel. The downstream block 20 further has a fourth reference plane A4 formed at right angles to the fourth and sixth side surfaces X4 and X6. The second reference plane A2 of the central block 30 is formed flush with the fourth reference plane A4 of the downstream block 20. That is, the second reference plane A2 is formed at a right angle to the second side surface X2.

The die coater 1 may include a plurality of central blocks. As the number of central blocks increases, the number of discharge ports formed in the gaps between the lips increases, and it becomes possible to form a multilayer film having three or more layers. The additional central block has substantially the same shape and function as the central block 30. The additional central block (fourth block) may be arranged between the downstream block 20 and the central block (third block) 30, or may be arranged between the upstream block 10 and the central block 30. May be good.

When an additional central block is arranged between the downstream block 20 and the central block 30, the downstream block 20 is an example of a second block and the upstream block 10 is an example of a first block. On the contrary, when the additional central block is arranged between the upstream block 10 and the central block 30, the upstream block 10 is an example of the second block, and the downstream block 20 is an example of the first block. Is.

Inside the die coater 1, manifolds (liquid pool chambers) 14 and 24 to which the coating liquid is supplied from an external metering pump or the like are formed. The coating liquid supplied to the manifolds 14 and 24 passes through the slits defined in the gaps of the metal blocks 10, 20 and 30 and is continuously discharged from the discharge ports formed in the gaps of the lips 13, 23 and 33. To.

In the example shown in FIG. 1, a first manifold 14 to which the first liquid is supplied is formed in the upstream block 10, and a second manifold 24 to which the second liquid is supplied is formed in the downstream block 20. The gap between the first side surface X1 and the third side surface X3 is partitioned as a slit through which the first liquid flows, and the gap between the second side surface X2 and the fourth side surface X4 is partitioned as a slit through which the second liquid flows. The second manifold 24 may be formed in the upstream block 10 and the first manifold 14 may be formed in the downstream block 20. Further, when the die coater 1 includes an additional central block, a third manifold to which the third liquid is supplied may be formed between the central block 30 and the additional central block.

As shown in FIG. 1, the lips 13, 23, 33, ... Are formed at the tip of the die coater 1 facing the base material W and project toward the base material W. In the example shown in FIG. 1, the lips 13, 23, 33, ... Are formed on the upstream lip 13 formed on the upstream block 10, the downstream lip 23 formed on the downstream block 20, and the central block 30. It is composed of a central lip 33 and a center lip 33.

FIG. 3 is an enlarged cross-sectional view of the lips 13, 23, 33 shown in FIG. As shown in FIG. 3, each of the lips 13, 23, 33 has a tip surface 133, 233, 333 facing the base material W. When forming a thin film, it was newly found that the shape accuracy of the edges of the lips 13, 23, 33 affects the variation in film thickness. The upstream lip 13 has an edge 131 located on the upstream side and an edge 132 located on the downstream side. The edge 131 is a ridge line at which the tip surface 133 and the stepped surface 134 intersect, and the edge 132 is a ridge line at which the tip surface 133 and the third side surface X3 intersect.

Similarly, the downstream lip 23 has an edge 231 located on the upstream side and an edge 232 located on the downstream side. The edge 231 is a ridge line where the tip surface 233 and the fourth side surface X4 intersect, and the edge 232 is a ridge line where the tip surface 233 and the stepped surface 234 intersect. Similarly, the central lip 33 has an edge 331 located on the upstream side and an edge 332 located on the downstream side. The edge 331 is a ridge line where the tip surface 133 and the first side surface X1 intersect, and the edge 332 is a ridge line where the tip surface 133 and the second side surface X2 intersect.

This will be described again with reference to FIG. In order to improve the processing accuracy at the edge, each of the metal blocks 10, 20 and 30 is made of a block body 11, 21, 31 made of a material having excellent dimensional stability and easy to process, and a material having excellent cutting edge. It is configured by combining the chips 12, 22, and 32 formed of.

In the example shown in FIG. 1, a stainless steel block body 11,21,31 and a cemented carbide chip 12, 22, 32 are combined. Examples of stainless steel include SUS420 and SUS630. The material of the chips 12, 22 and 32 is not limited to cemented carbide, but a material having better cutting edge property than stainless steel is preferable.

When the material of the chips 12, 22 and 32 is a cemented carbide, a part formed of a material such as iron is joined to the chips 12, 22 and 32, and a tap hole is formed in the part. Chip seats 15, 25, and 35 having a shape that follows the outer shape of the chips 12, 22, and 32 are formed on the block bodies 11, 21, and 31. The tips 12, 22, and 32 are fixed to the tip seats 15, 25, and 35 by fastening bolts (not shown).

The chips 12, 22, and 32 are ground on the joint surfaces of the chips 12, 22, and 32 and the block bodies 11, 21, and 31. Further, in the die coater 1 of the embodiment of the present invention, the tip seats 15, 25, and 35 are also ground. In the ground portion, the surface roughness of the chips 12, 22, 32 and the chip seats 15, 25, 35 is formed to be the maximum height Rz = 6.3 or less according to JIS B 0601: 2013.

FIG. 4 is a cross-sectional view of the central block 30 shown in FIG. As shown in FIG. 4, the insert seat 35 has a first grinding surface B1 and a second grinding surface B2. The first grinding surface B1 is formed at a right angle to the first side surface X1 and extends in the width direction TD of the base material W. Similarly, the second grinding surface B2 is formed at a right angle to the second side surface X2 and extends in the width direction TD of the base material W. That is, the first grinding surface B1 is formed parallel to the above-mentioned first reference surface A1, and the second grinding surface B2 is formed parallel to the above-mentioned second reference surface A2.

The tip 32 has a first seating surface C1 that abuts on the first grinding surface B1 and a second seating surface C2 that abuts on the second grinding surface B2. The first seating surface C1 is formed at a right angle to the first side surface X1 and extends in the width direction TD of the base material W. Similarly, the second seating surface C2 is formed at a right angle to the second side surface X2 and extends in the width direction TD of the base material W. The chip 32 has a mirror-symmetrical (left-right symmetric) cross section in which the hypotenuses of a pair of right triangles are combined in a cross-sectional view seen from the width direction TD of the base material W. The first seating surface C1 is formed parallel to the first reference surface A1 like the first grinding surface B1. The second seating surface C2 is formed parallel to the second reference surface A2, similarly to the second grinding surface B2.

The die coater 1 is repeatedly disassembled and cleaned on the production line. In order to reduce the burden on the operator, the die coater 1 is formed so that the metal blocks 10, 20, and 30 stand on their own even when disassembled. Specifically, in the upstream block 10, the third reference plane A3 is formed at right angles to the third and fifth side surfaces X3 and X5. In the downstream block 20, the fourth reference plane A4 is formed at right angles to the fourth and sixth side surfaces X4 and X6. In the central block 30, the first reference surface A1 is formed at right angles to the first side surface X1, and the second reference surface A2 is formed at right angles to the second side surface X2.

In the example shown in FIG. 1, the first side surface allows the die coater 1 to stand on its own in either the finished product state or the semi-finished product state in which the upstream block 10 or the downstream block 20 is removed from the finished product. The intersection angle between X1 and the second side surface X2 is adjusted in the range of 20 to 35 degrees. If the metal blocks 10, 20 and 30 have an unstable shape that cannot stand on the stage of a machine tool, they may move due to a trivial trigger and cannot be processed precisely. According to the present embodiment, the metal blocks 10, 20 and 30 have a self-supporting shape, and the die coater 1 having excellent processing accuracy can be provided.

When the disassembled die coater 1 is reassembled, it is preferable to assemble it in the same order as when it is ground by a machine tool. For example, when the die coater 1 is first assembled with the downstream block 20 and then the upstream block 10 is assembled and ground, even in disassembly and cleaning, the downstream block 20 is assembled first and then upstream. When the side blocks 10 are assembled in the order of assembly, the accuracy of the positional relationship between the tips of the metal blocks 10, 20, and 30 after assembly is superior to that in the case of assembling in the reverse order.

According to the die coater 1 of the present embodiment configured as described above, since the surface roughness of the first and second grinding surfaces B1 and B2 is Rz = 6.3 or less, when the edges 331 and 332 are processed. It is possible to prevent the contact condition between the chip 32 and the block main body 31 from changing and the positional relationship between them from shifting. When the work is fixed by using the jig for adjusting the angle, the machining accuracy of the insert 32 and the insert seat 35, which are the workpieces, includes an artificial error when the jig is manually installed. Further, the accuracy of the jig itself is included in the processing accuracy of the insert 32 and the insert seat 35. According to this embodiment, it is not necessary to use a jig for adjusting the angle. The first grinding surface B1 can be processed in a posture in which the first reference surface A1 is placed on the stage of a machine tool such as a surface grinder, and the second grinding surface B2 can be processed in a posture in which the second reference surface A2 is placed. As a result, the machining accuracy at the edges 331 and 332 can be improved.

Since the surface roughness of the first and second grinding surfaces B1 and B2 is Rz = 6.3 or less, the chip 32 and the block body 31 are in close contact with each other. Therefore, for example, at the position shown by the solid line in FIG. Even if the first and second manifolds 14 and 24 are provided, it is difficult for the coating liquid to enter the joint surface between the chip 32 and the block body 31. Further, since the surface roughness of the first and second grinding surfaces B1 and B2 is Rz = 6.3 or less, the relative position between the chip 32 and the block body 31 is difficult to move during the grinding process. Since the smoothness of the first and second side surfaces X1 and X2 is excellent and the step at the boundary between the chip 32 and the block body 31 can be made extremely small, for example, the first and second manifolds 14 and 24 are shown at two points in FIG. Even if it is provided at the position indicated by the chain line, the flow of the coating liquid passing through the slits defined in the gaps between the first and third side plates X1 and X3 and the gaps between the second and fourth side plates X2 and X4 is not easily disturbed.

In the present embodiment, the first side surface X1 and the second side surface X2 can stand on their own in either the state of the finished product or the state of the semi-finished product in which the upstream block 10 or the downstream block 20 is removed from the finished product. The intersection angle with is adjusted to the range of 20 to 35 degrees. If the metal blocks 10, 20 and 30 have an unstable shape that cannot stand on the stage of a machine tool, they may move due to a trivial trigger and cannot be processed precisely. According to this embodiment, the metal blocks 10, 20 and 30 have a self-supporting shape, and the die coater 1 having excellent processing accuracy can be provided.

Further, according to the present embodiment, since the tip 32 is formed of a cemented carbide having excellent cutting edge property, edges 331 and 332 having excellent dimensional accuracy can be formed. Hard materials such as cemented carbide and hardened steel are difficult to process female threads. According to the present embodiment, since the block main body 31 is made of stainless steel, it is easy to process and a female screw can be provided to fix the first block 10 and the second block 20. It has excellent corrosion resistance and can be used for various coating liquids.

The embodiments described above are for facilitating the understanding of the present invention, and are not for limiting and interpreting the present invention. Each element included in the embodiment and its arrangement, material, condition, shape, size, etc. are not limited to those exemplified, and can be changed as appropriate. In addition, the configurations shown in different embodiments can be partially replaced or combined.

1 ... Die coater, 10 ... Upstream block (example of 1st block), 11 ... Block body, 12 ... Chip, 13 ... Upstream lip, 14 ... 1st manifold (example of liquid pool chamber), 15 ... Chip seat, 20 ... downstream block (example of second block), 21 ... block body, 22 ... chip, 23 ... downstream lip, 24 ... second manifold (example of liquid pool), 25 ... chip seat, 30 ... central block , 31 ... Block body, 32 ... Chip, 33 ... Central lip, 35 ... Chip seat, 131, 132 ... Edge 133 ... Tip surface, 134 ... Step surface, 231,232 ... Edge, 233 ... Tip surface, 234 ... Step Surface, 331, 332 ... Edge, 333 ... Tip surface, A1 ... 1st reference surface, A2 ... 2nd reference surface, B1 ... 1st grinding surface, B2 ... 2nd grinding surface, C1 ... 1st seating surface, C2 ... 2nd seating surface, X1 ... 1st side surface, X2 ... 2nd side surface, X3 ... 3rd side surface, X4 ... 4th side surface, X5 ... 5th side surface, X6 ... 6th side surface.

Claims (3)

A die coater that simultaneously supplies a plurality of coating liquids to a base material to form a multilayer film on the surface of the base material, and is a first block in which a liquid pool chamber to which the first liquid is supplied is formed, and a second liquid. A discharge port where the first liquid is discharged between the second block in which the liquid pool chamber to which the liquid is supplied is formed and the first block sandwiched between the first block and the second block. The central block is formed in a right-angled shape by combining a chip facing the base material and a block body formed of a material different from the chip and holding the chip. , A first side surface facing the first block, a second side surface in which the distance between the first side surface becomes narrower toward the base material, and a first reference surface formed at right angles to the first side surface. And a second reference surface formed at right angles to the second side surface, and the chip has a first seating surface formed parallel to the first reference surface and the second reference surface. The block body has the first reference plane and the second reference plane, and is formed parallel to the first reference plane to have the first seating surface formed in parallel with the first reference plane. It further has a first grinding surface that abuts on the seating surface and a second grinding surface that is formed parallel to the second reference surface and abuts on the second seating surface, and has the first grinding surface and the second grinding surface. A die coater in which the surface roughness of the ground surface is formed to have a maximum height Rz = 6.3 or less in accordance with JIS B 0601: 2013. The die coater according to claim 1, wherein the chip is made of cemented carbide and the block body is made of stainless steel. The die coater according to claim 1 or 2, wherein the intersection angle between the first side surface and the second side surface is 20 to 35 degrees.

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