JP2002370057A - Extrusion type nozzle and coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extrusion type nozzle capable of uniformly coating a coating liquid on a surface of a substance to be coated in consideration to a problem possessed by a conventional extrusion type nozzle. SOLUTION: The extrusion type nozzle 100 is provided with manifolds 4, 6 of two stages in a delivery direction so as to spread the coating liquid in a coating width direction and slits 5, 7 of two stages for adjusting a flow of the coating liquid fed to the manifolds in the delivery direction. The slit 5 at a flow-in side of the coating liquid is formed by an exchangeable flow passage-forming member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion type nozzle used for applying a coating liquid to the surface of a sheet-like object to be coated and a continuously running belt-shaped object to be coated. The present invention relates to an extrusion type nozzle used in the production of magnetic recording tapes, adhesive tapes, photographic printing paper, offset plate materials, and battery plates.

[0002]

2. Description of the Related Art As a method of uniformly applying a coating liquid on the surface of a coating object, there is a coating method using an extrusion type nozzle. The extrusion type nozzle has a structure including a manifold for distributing the coating liquid supplied to the nozzle in the coating width direction, and a slit for rectifying and discharging the coating liquid in the manifold. In the application of a viscous application liquid, the pressure in the manifold is not uniform in the application width direction due to pressure loss. For this reason, in the extrusion type nozzle in which the length of the slit in the discharge direction is uniform over the application width direction, the application amount in the high pressure portion is large, and the application amount in the low pressure portion is small. Variations in application amount occur.

[0003] As a method for making the coating amount distribution uniform in the coating width direction, JP-A-1-180266 discloses a method in which the length of a slit in a coating liquid discharge direction is increased or the slit gap is reduced. Discloses a method in which the pressure in the manifold is increased to make the coating amount distribution uniform in the coating width direction. Japanese Patent Application Laid-Open No. 6-335653 discloses that the length of a slit in a coating liquid discharge direction is shortened by giving a linear or curved taper from the coating liquid supply side to the opposite side. A method for making the application amount distribution in the application width direction uniform is shown.

Further, in Japanese Patent Application Laid-Open No. H10-5660, a part of the slit is constituted by a replaceable member, and by exchanging this member, the length of the slit formed by this member and the gap in the discharge direction are reduced. A method is shown in which various coating liquids are easily and uniformly applied by changing them.

[0005]

However, the method of increasing the length of the slit in the application liquid discharge direction or reducing the slit gap causes deformation of the nozzle due to an increase in the fluid pressure inside the nozzle. The application amount distribution becomes non-uniform. In order to suppress the deformation, there is a method of increasing the rigidity of the nozzle by increasing the thickness of the nozzle body, but it is not preferable in terms of manufacturing cost and workability.

A nozzle in which the length of the slit in the coating liquid discharge direction is changed in the coating width direction is a method that is effective only for a coating liquid having a specific viscosity characteristic and uses a coating liquid having different viscosity characteristics. If the viscosity of the coating liquid varies, it is difficult to achieve uniform coating.

In the method in which a part of the slit is formed by a replaceable member, it is possible to uniformly apply coating liquids having different viscosity characteristics by preparing a plurality of types of members. However, in the method disclosed in Japanese Patent Application Laid-Open No. H10-5660, since the member forming a part of the slit adjacent to the discharge port is replaceable, the accuracy of assembling the member to the nozzle body is reduced in the application amount in the application width direction. The influence on the distribution is large, and it is difficult to obtain reproducibility for each assembly, and it is difficult to always achieve uniform application. Further, unless a very large number of members are prepared, it is difficult to realize a very uniform coating, for example, within ± 1% in the coating width direction.

An object of the present invention is to provide an extrusion-type nozzle capable of uniformly applying a coating liquid on the surface of an object to be coated in consideration of the above-mentioned problems of the conventional extrusion-type nozzle. Is what you do.

[0009]

According to a first aspect of the present invention, a manifold for distributing a coating liquid in a coating width direction is provided in two stages in a discharging direction, and a slit for rectifying the coating liquid supplied to the manifold is formed in a discharging direction. Wherein the slit on the inflow side of the coating liquid is formed of a replaceable member.

According to a second aspect of the present invention, the length of the slit on the discharge side of the coating liquid in the discharge direction is equal over the coating width direction, and the length of the slit on the inflow side of the coating liquid in the discharge direction is equal. An extrusion-type nozzle according to a first aspect of the present invention, which changes in the application width direction.

According to a third aspect of the present invention, a member having a uniform thickness in a coating width direction is disposed between the member forming the slit on the inflow side of the coating liquid and the extrusion-type nozzle body. The first or second
Of the present invention.

According to a fourth aspect of the present invention, there is provided an extrusion apparatus comprising two stages in a discharge direction of a manifold for distributing a coating solution in a coating width direction and two stages of slits in a discharge direction for rectifying the coating solution supplied to the manifold. A mold nozzle, a member forming a gap of the slit on the inflow side of the coating liquid, a member facing the member and forming the slit on the inflow side of the coating liquid, parallel or An extrusion type nozzle provided with a mechanism for displacing the nozzle by inclining the nozzle.

According to a fifth aspect of the present invention, there is provided an extrusion-type nozzle including a manifold for spreading a coating liquid in a coating width direction, and a slit for rectifying and discharging the coating liquid supplied to the manifold. Are formed with at least two different gaps in the ejection direction, and a member forming the gap other than a portion located on the most ejection side is opposed to a member forming the gap in opposition to the member. An extrusion type nozzle having a mechanism for displacing it in parallel or inclined.

According to a sixth aspect of the present invention, there is provided an extrusion-type nozzle including a manifold for spreading a coating solution in a coating width direction, and a slit for rectifying and discharging the coating solution supplied to the manifold. An extrusion-type nozzle, characterized in that a cross-sectional shape of a flow path for supplying a coating liquid therein is non-circular.

A seventh aspect of the present invention is the extrusion type nozzle according to the sixth aspect of the present invention, wherein an aspect ratio of a cross-sectional shape of the flow path for supplying a coating liquid into the manifold is 2 or more. It is.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) Claims 1 and 2
Embodiment 1 will be described. FIG. 1 shows the first
FIG. 4 is a side sectional view of the extrusion type nozzle 100 according to the invention during application. FIG. 2 is a perspective view of the lower block 1 of the extrusion type nozzle 100 of the first invention.

As shown in FIG. 1, the nozzle 100 is combined with a lower block 1, an upper block 2 and a member 3 for forming a flow path inside the nozzle to form a manifold 4 on the inflow side, a slit 5 on the inflow side, A discharge-side manifold 6 and a discharge-side slit 7 are formed.

The application liquid supplied into the nozzle 100 is distributed in the application width direction C in the inlet side manifold 4 by a supply pump capable of supplying a stable liquid like a fixed amount pump. The coating liquid in the inflow-side manifold 4 is discharged from the discharge port 8 to the surface of the object 9 through the inflow-side slit 5, the discharge-side manifold 6, and the discharge-side slit 7, and is applied in the coating longitudinal direction A. The coating film 10 is formed on the substrate.

As shown in FIG. 2, the exchangeable nozzle internal flow path forming member 3, which is a feature of the present invention, has a shape in which the length L1 in the discharge direction B is changed over the application width direction C. ing. By combining this member 3 with the lower block 1 and the upper block 2 in FIG. 1, the length of the slit 5 on the inflow side formed in the discharge direction B changes over the application width direction C. . The coating amount distribution in the coating width direction C changes depending on the length L1, the taper angle θ1, and the gap t1 of the inflow side slit 5 of the member 3 in the discharge direction B. By making it optimum according to the above, uniform application over the application width direction C becomes possible.

In the conventional extrusion type nozzle, since the flow path shape inside the nozzle is fixed, it is difficult to uniformly apply a plurality of types of coating liquids having different viscosities. It is necessary to prepare different nozzles. On the other hand, in the extrusion type nozzle 100 of the present invention, when the type of the coating liquid is changed, the member 3
The uniform application can be realized only by replacing the with a different shape.

In addition, in the extrusion type nozzle in which the member forming the whole or a part of the slit 7 on the discharge side adjacent to the discharge port is replaceable, the influence of the processing accuracy and the assembling accuracy of the member on the coating amount distribution. Is large, it is difficult to achieve the target application amount variation,
Further, there is a problem that the application amount distribution is different for each nozzle assembly, and reproducibility cannot be obtained.

The extrusion type nozzle 10 of the present invention
At 0, the slit 7 on the discharge side of the coating liquid is fixed, and the slit 5 on the inflow side is made variable by replacing the member 3.
By exchanging the member 3 on the inflow side of the application liquid having a higher fluid pressure, the influence of the assembling accuracy on the application amount distribution can be reduced, and uniform application can always be achieved.

Further, the ejection direction B of the slit 7 on the ejection side
Is uniform over the coating width direction C, and the length of the slit B on the inflow side in the discharge direction B is changed over the coating width direction C, so that the coating amount distribution in the coating width direction C is made uniform. By performing the slit 5 on the inflow side and the slit 7 on the discharge side to perform only the rectifying action in the discharge direction B, more stable and uniform coating can be realized.

(Embodiment 2) Embodiment 2 of the present invention will be described. FIG. 3 is a side sectional view at the time of application of the extrusion type nozzle 200 of the second invention. FIG. 4 is a perspective view of the lower block 11 of the extrusion type nozzle 200 of the second invention.

As shown in FIG. 3, the nozzle 200 is formed by combining a lower block 11, an upper block 12, a member 13 for forming a nozzle internal flow path, and a member 14 for adjusting the height of the member 13. , An inlet-side manifold 15, an inlet-side slit 16, a discharge-side manifold 17, and a discharge-side slit 18.

The application liquid supplied into the nozzle 200 is distributed in the application width direction F in the inlet side manifold 15 by a supply pump capable of supplying a stable liquid like a fixed amount pump. The coating liquid in the inflow-side manifold 15 is discharged from the discharge port 19 to the surface of the object 20 through the inflow-side slit 16, the discharge-side manifold 17, and the discharge-side slit 18. A coating film 21 is formed.

As shown in FIG. 4, the flow path forming member 13 inside the replaceable nozzle has a shape in which the length L2 of the discharge direction E is changed over the application width direction F.
This member 13 is connected to the lower block 11 and the upper block 1 in FIG.
2 and the member 13 for adjusting the height of the member 13 form an inflow-side slit 16, and the length of the inflow-side slit 16 in the discharge direction E changes over the application width direction F. Become. Discharge direction E of member 13
L2, taper angle θ2 and inflow side slit 16
The coating amount distribution in the coating width direction F changes due to the gap t2, and by making L2, θ2, and t2 optimal according to the viscosity of the coating liquid, uniform coating over the coating width direction F can be achieved. It becomes possible.

Further, in the extrusion type nozzle 200 of the present invention, a member 14 having a uniform thickness in the coating width direction F is disposed between the member 13 and the lower block 11. Gap t2 of slit 16 on the inflow side
Is easy to change.

Since the member 13 has a surface in contact with the coating liquid, high processing accuracy is required and the production cost is not low.
For this reason, it is difficult to prepare a large number of members 13 in which L2 and θ2 are finely changed, but since the member 14 is a plate-like member having a uniform thickness, for example, 0.1 m
It is also easy to prepare one having a thickness changed in m units. Therefore, in the extrusion type nozzle 200 of the present invention, the flow rate distribution can be finely adjusted by combining the member 13 and the member 14, and very uniform coating can be realized.

In the conventional extrusion type nozzle, since the flow path shape inside the nozzle is fixed, it is difficult to uniformly apply a plurality of types of coating liquids having different viscosities. It is necessary to prepare different nozzles. On the other hand, in the extrusion type nozzle 200 of the present invention, when the type of the coating liquid is changed, the member 1
Uniform application can be realized only by replacing the member 3 and the member 14.

In addition, in the extrusion type nozzle in which the member forming the whole or a part of the slit 18 on the discharge side adjacent to the discharge port is replaceable, the influence of the processing accuracy and the assembling accuracy of the member on the coating amount distribution. Is large,
There is a problem that it is difficult to achieve the target variation in the coating amount, and that the coating amount distribution is different for each nozzle assembly and reproducibility cannot be obtained.

In the nozzle of the present invention, the slit 18 on the discharge side of the coating liquid is fixed, and the slit 16 on the inflow side is
It is made variable by exchanging 3 and the member 14. The members 13 and 14 on the inflow side of the coating liquid having a higher fluid pressure
The influence of the assembling accuracy on the application amount distribution can be reduced by exchanging, and uniform application can always be realized.

Further, it is assumed that the length of the slit 18 on the discharge side in the discharge direction E is equal over the coating width direction F, and the length of the slit on the inflow side in the discharge direction is changed over the coating width direction F. In addition, the application amount distribution in the application width direction F is made uniform by the slit 16 on the inflow side, and the slit 18 on the ejection side has only a rectifying action in the ejection direction E, so that more stable uniform application can be realized.

(Embodiment 3) Embodiment 3 of the present invention will be described. FIG. 5 is a side sectional view of the extrusion type nozzle 300 of the third invention during application. FIG. 6 is a front sectional view of the extrusion nozzle 300 taken along line XX in FIG.

As shown in FIG. 5, the nozzle 300 is combined with a lower block 22, an upper block 23, and a member 24 for forming a nozzle internal flow path.
An inlet-side manifold 26, an inlet-side slit 27, a discharge-side manifold 28, and a discharge-side slit 29 are formed.

The application liquid supplied into the nozzle 300 is distributed in the application width direction in the inflow side manifold 26 by a supply pump capable of supplying a stable liquid like a fixed amount pump. The coating liquid in the inflow-side manifold 26 is supplied to the inflow-side slit 27 and the discharge-side manifold 2.
8. Discharged from the discharge port 30 to the surface of the object 31 through the slit 29 on the discharge side, and the coating 3
2 are formed.

The extrusion type nozzle 30 of the present invention
No. 0 is characterized by having a mechanism 25 for displacing the flow path forming member 24 inside the nozzle in the direction of arrow I in the figure. As the displacement mechanism 25, a differential screw, a heat bolt, a piezo actuator, or the like can be used.

By moving the member 24 in the direction of arrow I using the displacement mechanism 25, the gap t3 of the inflow side slit 27 can be changed, and the flow rate distribution in the coating width direction changes.

The member 24 is displaced while maintaining a state parallel to the upper block 23 so that the gap t3 of the slit 27 on the inflow side is constant in the coating width direction J, so that the center portion in the coating width direction J The coating amount at the end can be made uniform. Also, as shown in FIG. 6, by providing a plurality of displacement mechanisms 25 in the application width direction J, the gap t3 of the slit 27 on the inflow side can be inclined in the application width direction J, and the application amount at both ends is uniform. It is also possible to make it.

In the conventional extrusion type nozzle,
By deforming the portion of the member forming the slit on the discharge side close to the discharge port and changing the opening degree of the discharge port in the application width direction, there is a type in which the application amount distribution is uniformed. When deformed, problems such as uneven streaks may occur on the surface of the coating film. In the extrusion type nozzle of the present invention, the coating amount distribution is adjusted in a portion of the nozzle distant from the discharge port without deforming the vicinity of the discharge port, so that a very good surface coating film can be obtained.

Further, an apparatus for measuring the thickness of the coating film 32,
If a computer or the like that calculates the optimum value of the gap t3 for equalizing the coating amount distribution in the coating width direction from the measurement results of the film thickness and the thickness of the coating liquid is combined with the extrusion type nozzle 300 of the present invention, It automatically follows the fluctuation of the coating amount distribution due to a change in viscosity or the like, and can always realize a stable and uniform coating.

(Embodiment 4) A fourth embodiment of the present invention will be described. FIG. 7 is a sectional side view of the extrusion type nozzle 400 of the fourth invention during application. FIG. 8 is a front sectional view of the extrusion type nozzle 400 taken along line YY in FIG.

As shown in FIG. 7, the nozzle 400 is combined with a lower block 34, an upper block 35 and a member 36 for forming a nozzle internal flow path.
A manifold 38, a slit 39 on the inflow side, and a slit 40 on the discharge side are formed.

The application liquid supplied into the nozzle 400 is distributed in the application width direction in the manifold 38 by a supply pump capable of supplying a stable liquid like a fixed amount pump. Then, the coating liquid in the manifold 38 is discharged from the discharge port 41 to the surface of the object 42 through the slit 39 on the inflow side and the slit 40 on the discharge side, and a coating film 43 is formed in the coating longitudinal direction K.

The extrusion type nozzle 40 of the present invention
No. 0 is characterized by having a mechanism 37 for displacing the flow path forming member 36 inside the nozzle in the direction of arrow M in the figure. As the displacement mechanism 37, a differential screw, a heat bolt, a piezo actuator, or the like can be used.

By moving the member 36 in the direction of the arrow M using the displacement mechanism 37, the gap t4 of the slit 39 on the inflow side can be changed, and the flow rate distribution in the coating width direction changes.

The member 36 is displaced while maintaining a state parallel to the upper block 35 so that the gap t4 of the slit 39 on the inflow side is constant in the coating width direction. Can be applied uniformly. Further, as shown in FIG. 8, by providing a plurality of displacement mechanisms 37 in the application width direction N, the gap t4 of the slit 39 on the inflow side can be inclined over the application width direction N, and the application amount at both ends can be reduced. It is also possible to make them uniform.

The conventional extrusion type nozzle includes:
By deforming the portion of the member forming the slit on the discharge side close to the discharge port and changing the opening degree of the discharge port in the application width direction, there is a type in which the application amount distribution is uniformed. When deformed, problems such as uneven streaks may occur on the surface of the coating film. In the extrusion type nozzle of the present invention, the coating amount distribution is adjusted in a portion of the nozzle distant from the discharge port without deforming the vicinity of the discharge port, so that a very good surface coating film can be obtained.

Further, an apparatus for measuring the thickness of the coating film 43,
If a computer or the like for calculating the optimum value of the gap t4 for equalizing the coating amount distribution in the coating width direction from the measurement results of the film thickness is combined with the extrusion-type nozzle 400 of the present invention, It automatically follows the fluctuation of the coating amount distribution due to a change in viscosity or the like, and can always realize a stable and uniform coating.

(Embodiment 5) Claims 6 and 7
Embodiment 5 will be described. FIG. 9 shows the fifth
FIG. 6 is a side sectional view of the extrusion type nozzle 500 according to the invention during application. FIG. 10 is a front sectional view of the extrusion nozzle 500 taken along line ZZ in FIG.

As shown in FIG. 9, a manifold 500 and a slit 50 are formed in the nozzle 500 by combining a lower block 45, an upper block 46, and the like. Further, the nozzle 500 is provided with a supply port 47 for supplying the coating liquid into the nozzle 500 and a flow path 48 for supplying the coating liquid to the manifold 49. In FIG. 9, the supply port 47 and the supply channel 48 are formed by combining the lower block 45 and the upper block 46, but the lower block 4
5 and the upper block 46 may be formed.

The application liquid supplied into the nozzle 500 is distributed in the manifold 49 in the application width direction by a supply pump capable of supplying a stable liquid like a fixed amount pump. Then, the coating liquid in the manifold 49 is discharged from the discharge port 51 to the surface of the coating object 52 through the slit 50, and the coating film 53 is formed in the coating longitudinal direction O.

The extrusion type nozzle 50 of the present invention
0 is characterized in that the cross-sectional shape of the flow path 48 for supplying the application liquid into the manifold 49 is non-circular.

In the conventional extrusion type nozzle, the cross-sectional shape of the supply flow path for the application liquid into the manifold is circular. In the application of a coating solution in which irreversible changes in physical properties are caused by shearing, when the cross-sectional shape of the supply flow path is circular, the one that has passed through the outer periphery with high shear and the one that has passed through the central part with low shear The physical properties such as the water content and the viscosity are different, and the application amount may vary in the application width direction.

On the other hand, in the extrusion type nozzle 500 of the present invention, since the cross-sectional shape of the supply flow path 48 is made non-circular, the difference in the level of shear in the cross section of the supply flow path 48 can be reduced. Uniform application is possible in the application width direction.

Further, by setting the aspect ratio, which is the ratio of the long side (w in FIG. 10) and the short side (h in FIG. 9) of the cross-sectional shape of the supply channel 48, to 2 or more, the difference in the height of the shear is reduced. The effect is improved, and more uniform coating can be achieved.

[0058]

EXAMPLES As a result of applying a coating liquid on the surface of an object to be coated using the extrusion type nozzle described in the present embodiment, and using a conventional extrusion type nozzle for comparison, The result of applying the coating liquid to the surface of the object will be described. In (Example 1) to (Example 4) and (Comparative Example 1), two types of coating liquids A and B having different viscosities were applied.

[0059] the coating solution A, the 1 wt% of carboxymethyl cellulose aqueous solution, obtained by dispersing carbon particles, solid concentration 50 wt%, viscosity of 15 Pa · s at a shear rate of 1s ^-1, a viscosity at a shear rate of 1000 s ^-1 0 .18 Pa · s. The coating liquid A does not cause irreversible changes in physical properties due to shearing.

[0060] Coating Solution B is a 1 wt% carboxymethyl cellulose aqueous solution, obtained by dispersing carbon particles, solid concentration 45 wt%, viscosity of 11 Pa · s at a shear rate of 1s ^-1, a viscosity at a shear rate of 1000 s ^-1 0 .13 Pa · s. The coating liquid B does not cause irreversible changes in physical properties due to shearing.

The coating liquid C used in (Example 5) and (Comparative Example 2) was obtained by dispersing carbon particles in a 0.2 wt% aqueous solution of carboxymethylcellulose. The viscosity at a speed of 1 s ⁻¹ is 20 Pa · s, and the viscosity at a shear speed of 1000 s ⁻¹ is 0.23 Pa · s. In addition, the coating liquid B has an irreversible change in physical properties due to shearing, and a difference in water content and viscosity occurs between a portion that is strongly subjected to shearing and a portion that is not subjected to much shearing, and is not re-stirred. As long as it does not return to a homogeneous state.

The conditions other than the coating liquid are common to all of (Example 1) to (Example 5), (Comparative Example 1) and (Comparative Example 2) and are as shown below.

The object to be applied is an aluminum foil having a width of 550 mm and a thickness of 30 μm. The application condition is an application width of 500
mm, the coating film thickness was 0.2 mm, and the coating speed was 0.2 m / s.

Example 1 The above-mentioned coating liquids A and B were applied using the extrusion type nozzle according to the first embodiment of the present invention.

The nozzle was made of stainless steel, and the shape of the flow path inside the nozzle was such that the slit on the discharge side of the coating liquid had a gap of 0.5 mm, the length in the discharge direction at the center of the coating width direction was 50 mm, and the taper angle was 0 °. And Also, the member 3 in FIG.
Is different for the coating liquids A and B. In the coating liquid A, the slit on the inflow side of the coating liquid is formed with a gap of 1.0 mm, a length in the discharge direction at the center in the coating width direction of 30 mm, and a taper angle of 3. In the case of the coating solution B, the slit on the inflow side was 1.0 mm in gap, the length in the discharge direction at the center in the coating width direction was 30 mm, and the taper angle was 2.5 °. In addition, the cross-sectional shape of the supply channel of the application liquid to the manifold is φ14.
mm round.

Example 2 The coating liquids A and B were applied by using the extrusion type nozzle according to the second embodiment of the present invention.

The nozzle is made of stainless steel, and the shape of the flow path inside the nozzle is such that the slit on the discharge side of the coating liquid has a gap of 0.5 mm, the length in the discharge direction at the center of the coating width direction is 50 mm, and the taper angle is 0 °. And The member 1 in FIG.
3 is the same for the coating liquids A and B, and the member 14 is a coating liquid A and B having different thicknesses. The length in the ejection direction at the center of the coating width direction was 30 mm, the taper angle was 3.0 °, and the slit on the inflow side of the coating liquid B was 1.1 mm in the coating liquid B. Further, the cross-sectional shape of the supply channel of the application liquid to the manifold was a circle of φ14 mm.

Example 3 The above-mentioned coating solutions A and B were applied using the extrusion type nozzle according to the third embodiment of the present invention.

The nozzle was made of stainless steel, and the shape of the flow path inside the nozzle was such that the slit on the discharge side of the coating liquid had a gap of 0.5 mm, a length in the discharge direction at the center of the coating width direction of 50 mm, and a taper angle of 0 °. And the slit on the inflow side of the coating liquid is 30 m in the discharge direction at the center in the coating width direction.
m and a taper angle of 3.0 °. The gap between the slits on the inflow side of the coating liquid is 1.0 mm for the coating liquid A,
Was set at 1.1 mm at the start of coating.

The cross-sectional shape of the flow path for supplying the coating liquid to the manifold was a circle having a diameter of 14 mm. Furthermore, by combining the extrusion type nozzle with a film thickness measuring device and a control device for the gap of the inflow side slit, the gap of the inflow side slit is automatically set to an optimum value based on the measurement result of the film thickness. I made it.

Example 4 The above-mentioned coating solutions A and B were applied using the extrusion type nozzle according to the fourth embodiment of the present invention.

The nozzle was made of stainless steel, and the shape of the flow path inside the nozzle was such that the slit on the discharge side of the coating liquid had a gap of 0.5 mm, the length in the discharge direction at the center of the coating width direction was 50 mm, and the taper angle was 0 °. And the slit on the inflow side of the coating liquid is 30 m in the discharge direction at the center in the coating width direction.
m and a taper angle of 3.0 °. The gap between the slits on the inflow side of the coating liquid is 1.0 mm for the coating liquid A,
Was set at 1.1 mm at the start of coating.

The cross-sectional shape of the flow path for supplying the coating liquid to the manifold was a circle having a diameter of 14 mm. Furthermore, by combining the extrusion type nozzle with a film thickness measuring device and a control device for the gap of the inflow side slit, the gap of the inflow side slit is automatically set to an optimum value based on the measurement result of the film thickness. I made it.

(Example 5) The application liquid C was applied using the extrusion type nozzle according to the fifth embodiment of the present invention.

The nozzle was made of stainless steel, and the shape of the flow path inside the nozzle was such that the slit was a gap of 0.5 mm, the length in the discharge direction at the center in the application width direction was 80 mm, and the taper angle was 2.0 °. Further, the cross-sectional shape of the supply channel of the application liquid to the manifold was a rectangle of 50 mm × 2 mm.

Comparative Example 1 The above-mentioned coating solutions A and B were applied using a conventional extrusion type nozzle.

The nozzle is made of stainless steel, and the shape of the flow path inside the nozzle is provided with one manifold and one slit. The slit has a gap of 0.5 mm and a length of 80 mm in the discharge direction at the center in the application width direction. , Taper angle 2.
0 °. Further, the cross-sectional shape of the supply channel of the application liquid to the manifold was a circle of φ14 mm.

(Comparative Example 2) Using the same conventional extrusion type nozzle as that of (Comparative Example 1), the coating liquid C was applied.

In the above (Example 1) to (Example 5), (Comparative Example 1) and (Comparative Example 2), the results of measuring the film thickness distribution in the coating width direction are shown in FIGS.

FIGS. 18 and 1 show the results of measuring the variation with time of the application variation when the application liquid A was applied in (Example 3), (Example 4) and (Comparative Example 1).
9 and FIG.

First, the results of coating the coating solutions A and B (Examples 1 to 4) and (Comparative Example 1) will be described.

In the case of using the conventional extrusion type nozzle (Comparative Example 1), the variation in the coating width direction of the coating liquid A was 2.6%. However, in the case of the coating solution B, the variation was as large as 16.3%. In addition, the coating solution A is changed by the change of coating conditions such as physical properties of the coating solution over time.
In the application, the variation of about 5% occurred in the longitudinal direction of the application.

On the other hand, in Example 1, the variation in the coating width direction was 1.6% for the coating solution A and 2.7% for the coating solution B. Uniform application was achieved with one nozzle.

In Example 2, the variation in the coating width direction was 1.4% for the coating solution A and 0.7% for the coating solution B. The same member 13 is used for the flow path forming member 13 inside the nozzle shown in FIG.
By using the sample of No. 4 having a different thickness, the coating solutions A and B having different physical properties could be uniformly applied.

In (Example 3), the optimum gap of the inflow side slit was automatically set based on the measurement result of the film thickness, so that stable and uniform coating with a variation of 1.5% or less was always realized.

In (Example 4), the optimum uniform gap of the inflow-side slit was automatically set based on the measurement result of the film thickness, so that stable and uniform coating with a variation of 1.7% or less was always realized.

Next, the results of applying the coating solution C (Example 5) and (Comparative Example 2) will be described.

In the case of using the conventional extrusion type nozzle (Comparative Example 2), the variation in the coating width direction was about 30%.
And became very large. The physical properties of the coating solution discharged from the center and the end in the coating width direction were measured. For this reason, it is considered that a very large variation occurred.

On the other hand, in the case of using the extrusion type nozzle of the present invention (Example 5), the application in the application width direction was 1.6%, and the application was uniform. The physical properties of the coating liquid discharged from the central part and the end part in the coating width direction are the same, and the physical properties of the coating liquid supplied into the manifold are changed in the width direction due to the difference in the cross-sectional shape of the supply flow path to the manifold. This is probably due to the uniformity.

[0090]

As is evident from the above description, the first to first aspects are as follows.
According to the fifth aspect of the present invention (corresponding to claims 1 to 5), in applying a coating liquid to the surface of an object to be coated, a member inside the nozzle is replaced or displaced by using one extrusion type nozzle. This makes it possible to uniformly apply a plurality of types of coating liquids having different physical properties.

Further, according to the third aspect of the present invention (corresponding to claim 3), extremely uniform coating can be achieved only by replacing members inside the nozzle which can be manufactured at low cost.

The fourth and fifth aspects of the present invention (claims 4 and 5)
According to the method described above, even when the application conditions such as the physical properties of the application liquid change with time, it is possible to always apply uniformly.

The sixth and seventh aspects of the present invention (claims 6 and 7)
According to the present invention, it is possible to uniformly apply a coating liquid whose physical properties change irreversibly due to shearing.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view of an extrusion type nozzle of the present invention in Embodiment 1 at the time of application.

FIG. 2 is a perspective view of a lower block of the extrusion type nozzle according to the first embodiment of the present invention (in a state where a member for forming a flow path inside the nozzle is assembled).

FIG. 3 is a side cross-sectional view of the extrusion type nozzle of the present invention in Embodiment 2 during application.

FIG. 4 is a perspective view of a lower block of an extrusion type nozzle of the present invention (a state in which a member for forming a flow path inside the nozzle and a member for adjusting the height of the flow path forming member) in Embodiment 2 are assembled.

FIG. 5 is a sectional side view of the extrusion type nozzle of the present invention in Embodiment 3 during application.

FIG. 6 is a cross-sectional view of the extrusion type nozzle of the present invention in Embodiment 3 taken along line XX in FIG. 5;

FIG. 7 is a side sectional view at the time of application of the extrusion type nozzle of the present invention in Embodiment 4.

FIG. 8 is a cross-sectional view of the extrusion type nozzle of the present invention in Embodiment 4 taken along line YY in FIG. 7;

FIG. 9 is a side sectional view at the time of application of an extrusion type nozzle of the present invention in a fifth embodiment.

FIG. 10 is a cross-sectional view of the extrusion-type nozzle of the present invention in the fifth embodiment, taken along line ZZ in FIG. 9;

FIG. 11 is a view showing a measurement result of a film thickness distribution in a coating width direction of a coating film in Example 1.

FIG. 12 is a diagram showing a measurement result of a film thickness distribution in a coating width direction of a coating film in Example 2.

FIG. 13 is a view showing a measurement result of a film thickness distribution in a coating width direction of a coating film in Example 3.

FIG. 14 is a view showing a measurement result of a film thickness distribution in a coating width direction of a coating film in Example 4.

FIG. 15 is a view showing a measurement result of a film thickness distribution in a coating width direction of a coating film in Example 5.

FIG. 16 is a view showing a measurement result of a film thickness distribution in a coating width direction of a coating film in Comparative Example 1.

FIG. 17 is a view showing a measurement result of a film thickness distribution in a coating width direction of a coating film in Comparative Example 2.

FIG. 18 is a view showing a result of measuring a thickness variation in a coating width direction of a coating film in a coating longitudinal direction in Example 3.

FIG. 19 is a view showing a result of measuring a thickness variation in a coating width direction of a coating film in a coating longitudinal direction in Example 4.

FIG. 20 is a view showing a result of measuring a thickness variation in a coating width direction of a coating film in a coating longitudinal direction in Comparative Example 1.

[Explanation of symbols]

100, 200, 300, 400, 500 Extrusion type nozzle 1, 11, 22, 34, 45 Lower block 2, 12, 23, 35, 46 Upper block 3, 13, 24, 36 Flow path forming member inside nozzle 4,15,26 Inlet side manifold 5,16,27,39 Inlet side slit 6,17,28 Discharge side manifold 7,18,29,40 Discharge side slit 8,19,30,41,51 Discharge port 9,20 , 31, 42, 52 Coating object 10, 21, 32, 43, 53 Coating film 14 Height adjustment member of member 13 Displacement mechanism of member 24 33, 44 Side block 37 Displacement mechanism of member 36 38, 49 Manifold 47 supply port 48 supply flow path 50 slit t1 gap between inflow side slits 5 L1 length of member 3 in discharge direction θ1 taper angle of member 3 t 2 Gap of the inflow side slit 16 L2 Length of the member 13 in the discharge direction θ2 Taper angle of the member 13 t3 Gap of the inflow side slit 27 t4 Gap of the inflow side slit 39 t5 Gap of the discharge side slit 40 h Short section of the supply flow path Length of side w Length of long side of cross section of supply flow path A, D, G, K, O Application longitudinal direction B, E, H, L, P Discharge direction C, F, J, N, Q Application width direction I Displacement direction of member 24 M Displacement direction of member 36

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 5/842 B41J 3/04 103Z F-term (Reference) 2C057 AF99 AG22 AG30 BF06 2H023 EA01 4F033 AA01 BA03 CA05 DA01 EA01 NA01 4F041 AA12 AB02 CA02 5D112 AA05 CC08

Claims (7)

[Claims] 1. An extrusion-type nozzle having two stages in a discharge direction of a manifold for spreading a coating solution in a coating width direction and two stages of slits in a discharge direction for rectifying the coating solution supplied to the manifold. An extrusion-type nozzle, wherein the slit on the inflow side of the coating liquid is formed of a replaceable member. 2. The length of the slit on the discharge side of the coating liquid in the discharge direction is equal over the coating width direction, and the length of the slit on the inflow side of the coating liquid in the discharge direction changes in the coating width direction. The extrusion type nozzle according to claim 1, wherein 3. A member having a uniform thickness across a coating width direction is disposed between a member forming the slit on the inflow side of the coating liquid and the extrusion-type nozzle body. The extrusion type nozzle according to claim 1 or 2, wherein: 4. An extrusion type nozzle comprising two stages in a discharge direction of a manifold for spreading a coating solution in a width direction of a coating solution and two stages of slits in a discharge direction for rectifying the coating solution supplied to the manifold. And displacing the member forming the gap of the slit on the inflow side of the coating liquid in parallel or inclined with respect to the member forming the slit on the inflow side of the coating liquid in opposition to the member. An extrusion nozzle having a mechanism. 5. An extrusion type nozzle having a manifold for spreading a coating liquid in a coating width direction and a slit for rectifying and discharging the coating liquid supplied to the manifold, wherein the slit is at least in a discharging direction. The member forming the gap other than the portion located at the most discharge side is formed with two stages of different gaps, and is parallel or inclined to the member forming the gap in opposition to the member. An extrusion nozzle comprising a mechanism for displacing. 6. An extrusion nozzle having a manifold for spreading a coating liquid in a coating width direction and a slit for rectifying and discharging the coating liquid supplied to the manifold, wherein the coating liquid is supplied into the manifold. An extrusion-type nozzle, wherein a cross-sectional shape of a supply channel is non-circular. 7. The extrusion type nozzle according to claim 6, wherein an aspect ratio of a cross-sectional shape of a flow path for supplying a coating liquid into the manifold is 2 or more.