JP2004351349A - Die head for coating and coating apparatus and production method of die head for coating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress a membrane thickness defect area and non-uniformity of coating thickness at a start end of coating to be very small and enable to carry out high precision coating which is required at the time of manufacturing a liquid crystal color filter. <P>SOLUTION: In a die head for coating for discharging a coating liquid while moving relative to a substrate and applying the coating liquid to the substrate surface, the die head for coating is so constituted to suppress a membrane thickness defect area at a start end of coating to be very small, to suppress non-uniformity of coating thickness to be very short and to enable to carry out a high precision coating which is required at the time of manufacturing a liquid crystal color filter by applying a mirror plane grinding process on a lip part surface, making the contact angle with the coating liquid on a tip end side surface larger than that of the lip part with the coating liquid. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technique for applying a coating liquid with high accuracy to a flat substrate such as a glass plate using a die head.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a manufacturing process of a color filter for liquid crystal, a colored layer such as R, G, B is formed on a substrate such as a glass plate, or a surface protective layer such as acrylic or a black matrix (light shielding layer) made of resin is formed. For this reason, a liquid resist is applied. Since high-precision coating is required for applying these resists, a spin method is generally used in which an excessive amount of droplets is supplied to the substrate surface, and the substrate is rotated at a high speed to spread the resist thinly and uniformly. However, in this method, most of the supplied resist is scattered around, so that there is a problem that the consumption of the resist increases and the cost increases. As shown in FIG. 9, the substrate 2 is held on the chuck table 5, the tip of the coating die head 1 is arranged close to the surface of the substrate 2, and the substrate 2 is relatively moved with respect to the die head 1. A method is also known in which a liquid resist is discharged from the die head 1 while applying the resist on the substrate surface to form a coating layer 4, and immediately thereafter, the substrate 2 is rotated at a high speed to make the thickness of the coating layer 4 uniform. ing. However, this method requires two steps of a coating step using a die head and a subsequent spinning step, so that there is a problem that the cost is also high. Therefore, as an alternative to these methods, a method of making the thickness of the coating layer 4 uniform only by the coating process using the die head 1 as in Patent Document 1 is known. Here, in the specifications at the time of manufacturing the color filter for liquid crystal, it is required that the defective film thickness region until the film thickness of the coating layer 4 becomes uniform is kept within 5 mm from the coating start end 4a in the coating direction. ing. However, in the application by the die head 1, it has been difficult to suppress the film thickness defect area within 5 mm in the application direction from the application start end 4a.
[0003]
Next, the cause of the occurrence of the film thickness defect area at the coating start end 4a in the coating by the die head 1 will be described. As shown in FIG. 10, the die head 1 includes a slit 11 for discharging a resist to be applied (referred to as a coating liquid), a lip portion 12 formed on both ends of the slit 11 at a substantially right angle to the slit 11, and a lip portion 12. And has a tip side surface 13 inclined with respect to the lip portion 12, and forms a pool (bead) 3 of the coating liquid between the lip portion 12 and the substrate 2 at the time of coating. The coating solution of the bead 3 is applied to the surface of the substrate 2. At the start of coating, the coating liquid discharged from the slit 11 moves in the coating width direction of the lip portion 12 to form a bead 3. If the formation time is short, the film thickness defect area until the film thickness at the coating start end portion becomes uniform becomes short. However, in actuality, the polishing of the surface of the lip portion 12 in the final finish is left to the performance or manual work of the polishing machine, and the surface roughness is large, and the lip portion 12 comes into contact with the coating liquid due to the unevenness of the surface. The corners change locally and hinder the movement of the coating solution. Then, it becomes difficult for the coating liquid to move in the coating width direction, and when the formation time of the beads 3 becomes long, a large amount of coating liquid (initial bead amount) for forming the beads 3 is required. As a result, the thickness of the film was poor, and the film thickness defect area before the film thickness became uniform at the coating start end became long.
[0004]
Further, in the application by the die head 1, as described below, streaks 41 and step unevenness 42 occur in the application layer 4, and the unevenness of the application thickness cannot be suppressed within an allowable range. Here, the cause of the occurrence of unevenness in the coating thickness in the coating by the die head 1 will be described. In FIG. 10, if the bead 3 is stable and has a constant shape during coating, that is, points A and B where the outermost liquid of the bead 3 separates from the die head 1 are located at the lip 12 and the tip of the die head 1. If it is held on the boundary line (edge portion) with the side surface 13, the thickness unevenness of the coating layer 4 hardly occurs. However, actually, the points A and B at which the outermost liquid of the bead 3 separates from the die head 1 are not held at the edge of the die head 1 but wrap around from the lip 12 to the tip side surface 13 as shown by an arrow C, In many cases, the beads 3 move on the tip side surface 13 or move at the lip portion 12 as shown by the arrow D, and the beads 3 often change in an unstable manner. When the movement of the points A and B occurs locally in the width direction of the die head 1, a streak 41 (see FIG. 9) extending in the movement direction of the substrate is generated. Step unevenness 42 extending in the direction was generated.
[0005]
Therefore, in order to stabilize the bead 3 by keeping the points A and B at which the outermost liquid of the bead 3 separates from the die head 1 and stabilize the bead 3, as shown in FIG. A die head 1A in which an edge 18 is formed is known. However, the die head 1A having this configuration can stabilize the bead 3 to some extent as compared with the die head 1 shown in FIG. 10, but the points A and B at which the outermost liquid of the bead 3 is separated from the die head 1A. Unstable movement cannot be sufficiently suppressed, and therefore stripes and step unevenness are reduced to some extent, and high-precision coating required at the time of manufacturing a color filter for liquid crystal cannot be performed.
[0006]
[Patent Document 1]
Patent No. 3201195 gazette
[Problems to be solved by the invention]
The present invention has been made in view of such a situation, and suppresses a film thickness defect area and a coating thickness unevenness at a coating start end portion to be extremely small, and performs high-precision coating as required when manufacturing a liquid crystal color filter. An object of the present invention is to provide a coating die head capable of performing the above.
[0008]
[Means for Solving the Problems]
The above object is achieved by the present invention described below. That is,
A coating die head according to claim 1 of the present invention is a coating die head that discharges a coating liquid while relatively moving with respect to a substrate, and applies the coating liquid to the substrate surface, wherein the slit discharges the coating liquid. And a coating die head having a lip portion formed substantially at right angles to the slit on both ends of the slit, and a tip side surface located outside the lip portion and inclined with respect to the lip portion. The lip has a surface roughness of Rmax 0.3 S or less. According to the present invention, the surface roughness of the lip portion is reduced, and the local change in the contact angle of the lip portion with the coating liquid is reduced, so that the coating liquid is easily moved in the coating width direction, and the bead is formed. Can be shortened. Therefore, by using it for resist coating in the production of color filters for liquid crystals, it is possible to suppress the film thickness defect area at the coating start end extremely short, and to perform high-precision coating as required when producing color filters for liquid crystals. Provided is a coating die head that enables the following.
[0009]
A coating die head according to a second aspect of the present invention is the coating die head according to the first aspect, wherein the surface of the lip portion is mirror-finished.
[0010]
The coating die head according to a third aspect of the present invention is the coating die head according to the second aspect, wherein the mirror surface grinding is an electrolytic in-process dressing grinding (ELID grinding).
[0011]
The coating die head according to a fourth aspect of the present invention is the coating die head according to any one of the first to third aspects, wherein the contact angle with respect to the coating liquid on the front end side surface is determined by the coating liquid on the lip portion. Is larger than the contact angle with respect to. ADVANTAGE OF THE INVENTION According to this invention, the point which the outermost liquid of a bead separates from a die head can be hold | maintained at the edge part which is the boundary line of a front-end | tip side surface and a lip part. Therefore, the coating die head can be used for resist coating in the production of a liquid crystal color filter, thereby suppressing the unevenness of the coating thickness to be extremely small and performing high-precision coating as required in the production of a liquid crystal color filter. I will provide a.
[0012]
The coating die head according to claim 5 of the present invention is the coating die head according to claim 4, wherein the front end side surface is subjected to electroless nickel plating containing 1 to 10% of a fluororesin. .
[0013]
A coating die head according to a sixth aspect of the present invention is the coating die head according to the first to fifth aspects, wherein the surface roughness of the front end side surface and the surface roughness of the lip portion are different from each other. ADVANTAGE OF THE INVENTION According to this invention, the point which the outermost liquid of a bead separates from a die head can be hold | maintained at the edge part which is the boundary line of a front-end | tip side surface and a lip part. Therefore, the coating die head can be used for resist coating in the production of a liquid crystal color filter, thereby suppressing the unevenness of the coating thickness to be extremely small and performing high-precision coating as required in the production of a liquid crystal color filter. I will provide a.
[0014]
The coating die head according to claim 7 of the present invention is the coating die head according to any one of claims 1 to 6, wherein the straightness of the boundary between the tip side surface and the lip portion and the parallelism with respect to the slit. Is set to 2 μm / m or less. According to the present invention, by using the resist coating in the production of a liquid crystal color filter, the thickness defect area at the coating start end can be extremely short, and the coating thickness unevenness can be extremely small. Provided is a coating die head capable of performing high-precision coating required at the time of manufacturing.
[0015]
The coating die head according to claim 8 of the present invention is the coating die head according to any one of claims 4 to 7, wherein a large contact angle region and a small contact angle region in the boundary region between the tip side surface and the lip portion. And the boundary between the tip side surface and the lip portion is set to 2 μm or less. ADVANTAGE OF THE INVENTION According to this invention, the unevenness | coating thickness of application | coating is suppressed very small by using it for the resist coating in liquid crystal color filter manufacture, and it becomes possible to perform the highly precise coating required at the time of manufacture of a liquid crystal color filter. Provide a die head for coating.
[0016]
A coating apparatus according to a ninth aspect of the present invention provides the coating die head according to any one of the first to eighth aspects, and the coating die head configured to apply the coating liquid discharged from the coating die head to a substrate surface. Means for relatively moving the coating die head and the substrate with the tip of the processing die head being close to the substrate. According to the present invention, by using the resist coating in the production of a liquid crystal color filter, the film thickness defect area at the coating start end is extremely short, and the coating thickness unevenness is extremely small. Provided is a coating apparatus capable of performing high-precision coating required during manufacturing.
[0017]
A method of manufacturing a coating die head according to claim 10 of the present invention is a coating die head that discharges a coating liquid while relatively moving with respect to a substrate, and applies the coating liquid to the surface of the substrate. And a lip portion formed substantially at right angles to the slit on both sides of the tip of the slit, and a tip side surface located outside the lip portion and inclined with respect to the lip portion. In the method for manufacturing a die head, the surface roughness of the lip portion is set to Rmax 0.3S or less. According to the present invention, the surface roughness of the lip portion is reduced, and the local change in the contact angle of the lip portion with the coating liquid is reduced, so that the coating liquid is easily moved in the coating width direction, and the bead is formed. Can be shortened. Therefore, by using it for resist coating in the production of color filters for liquid crystals, it is possible to suppress the film thickness defect area at the coating start end extremely short, and to perform high-precision coating as required when producing color filters for liquid crystals. Provided is a method of manufacturing a coating die head which enables the following.
[0018]
According to a method of manufacturing a coating die head according to claim 11 of the present invention, in the method of manufacturing a coating die head according to claim 10, the surface of the lip portion is subjected to mirror polishing.
[0019]
It goes without saying that the coating die head and the coating apparatus of the present invention may be used for coating other than the purpose of manufacturing color filters for liquid crystals.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a schematic perspective view showing a coating die head 1 according to one embodiment of the present invention, and an enlarged sectional view of a part thereof. FIG. 2 is a schematic perspective view showing the tip end of the die head 1 in an enlarged manner.
[0021]
Similarly to the conventional die head, the die head 1 of this embodiment also has a slit 11 for discharging a coating liquid to be applied, lip portions 12 formed on both ends of the die at substantially right angles to the slit 11, and a lip portion 12 located outside the slit. , And a tip side surface 13 inclined with respect to the lip portion 12. The die head 1 is entirely formed of stainless steel. The width d of the lip portion 12 is usually set to about 0.03 mm to 0.1 mm. The lip portion 12 has a form in which the base material of the die head 1 is exposed as it is, and is finished with a surface roughness Rmax of 0.05 S or less by ELID grinding as a surface polishing method. Here, the surface roughness Rmax conforms to JIS B0601, and is defined as the maximum height in the entire target surface. The measuring method is a stylus measuring method based on JIS B0601. On the other hand, the front side surface 13 has a surface layer 14 formed by plating or coating a material having poor wettability with respect to the application liquid. Therefore, the front end side surface 13 is a surface having poor wettability (large contact angle) with respect to the coating liquid. Here, the surface layer 14 is formed by electroless nickel plating containing 1 to 10% of a fluororesin. When a liquid resist used in the production of a liquid crystal color filter is used as the coating liquid, the contact angle of the lip portion 12 with the coating liquid is about 7 to 10 degrees, and the formation of the surface layer 14 is performed using a fluororesin of 1 to 10%. When the contained electroless nickel plating treatment is performed, the contact angle becomes about 55 degrees, and a difference of 40 degrees or more can be secured. When the content of the fluororesin is within 10%, the hardness of the base material itself (Rockwell hardness HRC 45 to 55) is almost the same, and the wear resistance of the surface of the lip portion 12 can be maintained. If the content of the fluororesin is less than 1%, the contact angle of the lip portion 12 with respect to the coating liquid becomes small. On the other hand, if the content of the fluororesin is more than 10%, the wear resistance of the surface of the lip portion 12 cannot be maintained. Note that the region where the surface layer 14 is formed may be at least a region where the coating liquid may flow around at the time of coating.
[0022]
As shown in FIG. 2, the surface layer 14 formed on the tip side surface 13 is accurately formed up to a position corresponding to the boundary between the lip portion 12 and the surface layer 14. Further, a boundary 15 between the lip portion 12 and the surface layer 14 of the tip side surface 13 is formed linearly, and the straightness of the boundary 15 and the parallelism with respect to the slit 11 are set to 2 μm / m or less. Are made. Here, the surface layer 14 is accurately formed up to a position coincident with the boundary between the lip portion 12 and the surface layer 14, and the straightness of the boundary 15 and the parallelism to the slit 11 are set to 2 μm / m or less. As shown in FIG. 3A, the surface layer 14 is formed not only on the tip side surface 13 of the die head 1 but also on the lip portion 12 by plating, coating, or the like, and then, as shown in FIG. Then, the lip portion 12 may be polished to remove the surface layer 14 at that portion, and the boundary 15 may have a desired straightness. Note that the straightness of the boundary 15 is measured by a stylus-type measuring method based on JIS B0601.
[0023]
In order to perform coating using the die head 1, as shown in FIG. 4, the tip of the die head 1 is arranged close to the surface of the substrate 2 held on a chuck table (not shown), and the substrate 2 is placed on the die head 1. The coating liquid is discharged from the die head 1 while being moved, a bead 3 is formed between the lip portion 12 and the substrate 2, and the coating liquid of the bead 3 is applied to the surface of the substrate 2. Here, FIG. 5 is a schematic perspective view showing a state in which the coating liquid is being discharged from the die head 1. As shown in FIG. 5B, when the surface of the lip portion 12 of the die head 1 is polished with conventional loose abrasive grains, the surface roughness becomes large, and the local contact angle of the lip portion 12 with the coating liquid is increased. Therefore, the coating liquid hardly moves in the coating width direction, and the formation time of the bead 3a becomes longer. For this reason, as shown in FIG. 6A, the amount of the coating liquid (initial bead amount) for forming the beads 3a increases, and the coating layer formed on the substrate 2 is at the coating start end. The film thickness is large, and the defective film thickness region until the film thickness at the coating start end portion becomes uniform becomes long. Thus, as shown in FIG. 5C, the surface of the lip portion 12 of the die head 1 is polished by ELID grinding to reduce the surface roughness. Therefore, since the local change of the contact angle of the lip portion 12 with the coating liquid is reduced, the coating liquid is easily moved in the coating width direction, and the time for forming the beads 3b can be shortened. For this reason, as shown in FIG. 6B, the initial bead amount for forming the bead 3b is suppressed to an extremely small amount, and the coating layer 4 formed on the substrate 2 has a film at the coating start end. It is possible to form the coating layer 4 having an extremely short (for example, within 5 mm) film thickness defective area until the thickness becomes uniform. For this reason, by using the resist coating in the production of the color filter for liquid crystal, the coating with the coating accuracy required in the production of the color filter for liquid crystal (for example, the film thickness defect area at the coating start end is within 5 mm). It can be performed.
[0024]
The surface roughness by polishing by ELID grinding is not more than Rmax 0.2 S, and the lip portion 12 has a mirror surface, and the local change of the contact angle of the lip portion 12 with the coating liquid is reduced. In order to facilitate the movement of the coating liquid in the coating width direction and to shorten the formation time of the beads 3, the surface roughness is preferably set to Rmax0.1S, and more preferably the surface roughness is set to Rmax0.05S. preferable.
[0025]
Further, the tip side surface 13 of the die head 1 is formed so that the contact angle with the coating liquid is larger than the lip portion 12 with which the bead 3 is in contact, and thus the wettability with the coating liquid is worse. In the middle, points A and B at which the outermost liquid of the bead 3 is separated from the die head are held at an edge portion which is a boundary between the lip portion 12 having good wettability and the tip side surface 13 having poor wettability, and hardly fluctuate. For this reason, during the coating, the beads 3 are stable, and the coating layer 4 formed on the substrate 2 has almost no streak or step unevenness which has occurred conventionally, and has extremely small thickness unevenness (for example, The coating layer 4 (within ± 1.5% of the thickness) can be formed. For this reason, by using the resist coating in the production of the color filter for liquid crystal, it is possible to perform the application with the application accuracy (for example, the thickness unevenness is within ± 1.5% of the thickness) required in the production of the color filter for liquid crystal. It can be carried out.
[0026]
In the above-described embodiment, the lip portion 12 of the die head 1 is the surface of the base material as it is, and the front side surface 13 is coated with a surface layer 14 having poor wettability (large contact angle) with respect to the coating liquid by plating, coating, or the like. Although it is formed by surface treatment so that the contact angle is larger than that of the lip portion 12, the present invention is not limited to this configuration as a method of changing the contact angle between the lip portion 12 and the tip side surface 13. For example, as shown in FIG. 7, the portion forming the lip portion 12 and the portion forming the tip side surface 13 are formed by different members, and the surface materials thereof are made different, or as shown in FIG. Although the whole is made of the same material, the surface roughness of the lip portion 12 is increased to make it easier to wet the coating liquid (reduce the contact angle), and the surface roughness of the tip side surface 13 is reduced to reduce the coating liquid. The contact angle of the tip side surface 13 can also be made larger than the contact angle of the lip portion 12 by making the surface hard to wet (increase the contact angle) and varying the surface roughness. In order to change the contact angle between the lip portion 12 and the tip side surface 13, a method of appropriately combining a different surface material of the lip portion 12 and the tip side surface 13 with a different surface roughness may be employed. good.
[0027]
【The invention's effect】
As described above, according to the coating die head according to claims 1 to 3 of the present invention, the surface roughness of the lip portion is reduced, and the local change in the contact angle of the lip portion with the coating liquid is reduced. This makes it easier for the coating liquid to move in the coating width direction, thereby shortening the bead forming time. Therefore, by using it for resist coating in the production of color filters for liquid crystals, it is possible to suppress the film thickness defect area at the coating start end extremely short, and to perform high-precision coating as required when producing color filters for liquid crystals. Can be.
According to the coating die head according to claims 4 to 6 and claim 8 of the present invention, the point at which the outermost liquid of the bead separates from the die head is located at the edge portion which is the boundary between the tip side surface and the lip portion. Can be held. Therefore, by using it for resist coating in the production of a liquid crystal color filter, the unevenness of the applied thickness can be suppressed to a very small level, and high-precision coating as required in the production of a liquid crystal color filter can be performed.
Further, according to the coating die head according to claim 7 of the present invention, by using the resist coating in the production of the color filter for liquid crystal, the film thickness defect area at the coating start end can be suppressed extremely short, and the coating thickness can be reduced. Unevenness can be suppressed to a very small degree, and high-precision coating required at the time of manufacturing a liquid crystal color filter can be performed.
Further, according to the coating apparatus according to the ninth aspect of the present invention, by using the resist coating in the production of a color filter for a liquid crystal, the defective film area at the coating start end can be suppressed to be extremely short, and the coating thickness can be made uneven. Can be suppressed to a very small value, and high-precision coating as required at the time of manufacturing a color filter for liquid crystal can be performed.
According to the method for manufacturing a coating die head according to claims 10 and 11 of the present invention, the surface roughness of the lip portion is reduced, and the local change in the contact angle of the lip portion with the coating liquid is reduced. The coating liquid easily moves in the coating width direction, and the bead forming time can be shortened. Therefore, by using it for resist coating in the production of color filters for liquid crystals, it is possible to suppress the film thickness defect area at the coating start end extremely short, and to perform high-precision coating as required when producing color filters for liquid crystals. Can be.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a coating die head according to an embodiment of the present invention and an enlarged cross-sectional view of a part thereof. FIG. 2 is a schematic perspective view showing a tip end of the die head shown in FIG. FIGS. 3 (a) and 3 (b) are schematic perspective views illustrating a manufacturing process of the die head shown in FIG. 1; FIG. 4 is a schematic cross-sectional view showing a state where the die head of FIG. 1 is applied to a substrate surface; a) is a schematic perspective view showing a state in which a coating liquid is discharged from a die head, (b) is an enlarged cross-sectional view of the lip surface when the lip surface is polished with loose abrasive grains, and (c) is a lip portion. FIG. 6 (a) is a schematic cross-sectional view showing an initial bead formed when the surface of the lip is polished with free abrasive grains when the surface is polished by ELID grinding; (B) is formed when the lip surface is polished by ELID grinding. FIG. 7 is a schematic perspective view of a tip of a die head according to another embodiment of the present invention. FIG. 8 is a schematic perspective view of a tip of a die head according to still another embodiment of the present invention. FIG. 9 is a schematic perspective view showing a state where a conventional die head is applied to a substrate surface. FIG. 10 is a schematic sectional view showing a state where a conventional die head is applied to a substrate surface. FIG. 11 is another conventional die head. Schematic cross-sectional view showing the state of application on the substrate surface with [Description of reference numerals]
Reference Signs List 1 die head 2 substrate 3 bead 4 coating layer 5 chuck base 11 slit 12 lip portion 13 tip side surface 14 surface layer 15 boundary line

Claims (11)

A coating die head for discharging a coating liquid while moving relative to a substrate, and coating the substrate surface with a slit for discharging the coating liquid, and on both sides of a tip of the slit at a substantially right angle to the slit. In the coating die head having the formed lip portion and the tip side surface located outside the lip portion and inclined with respect to the lip portion, the lip portion has a surface roughness of Rmax 0.3 S or less. A coating die head characterized by the following. 2. The coating die head according to claim 1, wherein a surface of the lip is mirror-finished. 3. The coating die head according to claim 2, wherein said mirror surface grinding is electrolytic in-process dressing grinding. The coating die head according to any one of claims 1 to 3, wherein a contact angle of the tip side surface with respect to the coating liquid is larger than a contact angle of the lip portion with the coating liquid. 5. The coating die head according to claim 4, wherein an electroless nickel plating process containing 1 to 10% of a fluororesin is applied to the side surface of the tip. 5. The coating die head according to claim 4, wherein a surface roughness of the tip side surface and a surface roughness of the lip portion are different from each other. The coating die head according to any one of claims 1 to 6, wherein the straightness of a boundary between the tip side surface and the lip portion and the parallelism with respect to the slit are set to 2 µm / m or less. The deviation between the boundary between the region where the contact angle is large and the region where the contact angle is small in the boundary region between the tip side surface and the lip portion and the boundary line between the tip side surface and the lip portion are 2 μm or less. 8. The coating die head according to any one of items 4 to 7. The coating die head according to any one of claims 1 to 8, and a tip of the coating die head is brought close to the substrate so as to apply a coating liquid discharged from the coating die head to a substrate surface. Means for relatively moving the coating die head and the substrate in a state. A coating die head for discharging a coating liquid while moving relative to a substrate, and coating the substrate surface with a slit for discharging the coating liquid, and on both sides of a tip of the slit at a substantially right angle to the slit. In a coating die head having a formed lip portion and a tip side surface located outside the lip portion and inclined with respect to the lip portion, the coating lip portion has a surface roughness of Rmax 0.3 S or less. Manufacturing method of die head for construction. The method of manufacturing a coating die head according to claim 10, wherein the surface of the lip portion is mirror-finished.

Images