JP2003220359A - Coater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coater capable of performing extremely thin uniform coating without causing a rough surface in scrape-off type coating. <P>SOLUTION: The coater 10 is constituted of a precoating device 14 for applying a coating solution to a continuously running web 12 in an amount more excessive than a desired coating amount and a doctor blade 16 for scraping off the excessive coating solution. The doctor blade 16 is formed so that the edge thickness L1 thereof becomes 1-30 mm and can apply proper shearing force to the coating solution. <P>COPYRIGHT: (C)2003,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus, and particularly
Strips used in the manufacture of photographic materials and magnetic recording media
The present invention relates to a coating apparatus for coating a coating liquid on the support. [0002] 2. Description of the Related Art Photosensitive materials and magnetic recording media are continuously running.
A flexible belt-like support (hereinafter referred to as “web”)
Apply a predetermined coating liquid such as magnetic liquid on top of the coating film
It is manufactured through a coating process to be formed. In particular, magnetic recording tape
Magnetic recording media such as loops are intended for broadcasting and computers.
The capacity and recording density are improving rapidly, and the film thickness is thin.
In addition, a coating technique that can obtain a magnetic layer with a smooth surface
It has been demanded. As a method of applying a coating solution to a web surface
For example, roll coater method, gravure coat method,
Le Coat plus doctor method, extrusion coating
Method, slide coating type coating method and the like. Among the extrusion type coating apparatuses,
As in Patent Document 1, push the tip of the coating head onto the web.
Web tension is used in the application type
By increasing the fluid pressure at the tip of the coating head,
Eliminates the air entrained by Ebb and creates a thin and uniform coating layer
In the field of manufacturing magnetic recording media
It is used a lot. However, this type of extrusion
Possible coating layer thickness even when coating with a mold coater
Demands to obtain a thin magnetic layer
There is a problem that cannot be answered sufficiently. Furthermore, paint
The application layer is streaked due to the web scraping at the tip of the fabric head.
There is a drawback that it is easy to produce. [0006] From this, it is thinner and coating without stripes.
Patent Document 2 discloses a coating apparatus that can obtain a fabric layer.
Doctor blade scraping type applicator shown
There is. This applicator is a roll coater type applicator.
After applying excess coating solution to Eb, dispose it downstream of the coating machine.
Scrape off excess liquid with a doctor blade
By doing so, a thin coating layer is obtained. in this case,
In Patent Document 2, an excessive coating solution is applied to the web.
As a coating device, a roll coater type is used.
It is not necessary to limit to this, and support pressure extrusion
Type, extrusion type with backup, gravure
A slide coater type or the like can be used. [0007] [Patent Document 1] Japanese Patent Publication No. 5-8065 [0008] [Patent Document 2] Japanese Patent No. 2614119 [0009] However, the prior art
Doctor blade scraping-type coating device
Conventionally, it is 2 μm or less in a wet state like an air recording medium.
When an extremely thin magnetic layer is formed, the coated surface is rough and fine.
There was a problem that unevenness occurred. The current state of roughness
The elephant is the coating layer required for the magnetic layer of conventional magnetic recording media
It was not seen in the case of thickness, and the thickness of the coating layer
That became apparent by making the
The Ultra-thin and uniform coating with a scraping-type coating device
To do this, pursue the cause of this rough surface and eliminate it.
It is necessary to remove. The present invention has been made in view of such circumstances.
In the scraping-off type application, there is no rough surface.
We provide a coating device that can apply ultra-thin and uniform coating.
The purpose is to provide. [0011] The present invention achieves the above object.
In order to achieve this, the belt-like support
Excessive amount of coating liquid on the support with a coating device
After coating the coating solution, the doctor
Press the blade relatively to remove excess of the coating solution.
In the coating device for scraping off, the doctor blade
The thickness of the support in the running direction is 1 to 30 mm
It is characterized by that. The inventor of the present invention has found that the wet state is 2 μm or less.
Main causes of surface roughness when the ultra-thin coating below is applied
As a result, attention was focused on the aggregation of the coating solution. And strong cohesiveness
The larger the coating liquid, the rougher the coated surface,
By agglomeration, irregularities appear on the coated surface, resulting in rough surfaces.
The knowledge that it occurs is obtained. Furthermore, this surface roughness is suppressed.
In order to achieve the appropriate shear force by the doctor blade
To loosen the agglomerates of the coating solution.
Got a look. The present invention is based on such knowledge.
Apply appropriate shear force with a doctor blade.
Of the coating solution that affects the extremely thin coating layer.
Can loosen agglomerates to obtain a good coated surface
A coating apparatus is provided. Apply appropriate shearing force with a doctor blade
As a method, the doctor blade in the running direction of the support
Raid thickness (hereinafter referred to as “blade thickness”) within an appropriate range
Or the tip of the doctor blade (facing the support)
A method for making the shape of the surface to be an appropriate shape is conceivable.
For example, when applying a very thin coating of 2 μm or less in a wet state
The blade thickness of the doctor blade should be in the range of 1 to 30 mm.
Good. If the blade thickness is less than this range,
Unable to loosen the collection sufficiently, causing surface roughness.
Conversely, if the blade thickness is larger than this range, the doctor blade
The coating liquid scraped off by
As a result, uneven coating occurs. Therefore, Dr. Bure
By adjusting the blade thickness of the blade to 1-30 mm,
It is possible to obtain an extremely thin coated surface shape without roughness and surface roughness. Also, a doctor capable of effectively applying a shearing force.
-The shape of the tip of the blade is a combination of multiple planes.
Combined shapes or shapes that combine multiple curved surfaces,
Or a shape that combines a plane and a curved surface is considered.
The For example, when the shape is a combination of multiple curved surfaces,
Radius of curvature from upstream to downstream in the running direction of the support
If the diameter gradually decreases, the shear force is effectively applied.
To obtain a very thin coated surface without surface roughness or coating unevenness.
be able to. As a preferred embodiment of the present invention, there is a support.
After applying the coating solution to the carrier, scrape off the excess coating solution.
In the meantime, the coating solution applied to the support
It is preferable that the structure is not opened. here,
“The coating solution applied to the support is not released to the atmosphere.”
The coating surface of the support coated with the coating solution is at least large.
It means that it is not open to the public,
It does not matter whether the opposite end is open to the atmosphere.
Yes. [0016] DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings.
A preferred embodiment of the coating apparatus will be described in detail. FIG. 1 shows a scraping type coating apparatus according to the present invention.
FIG. 2 is a conceptual diagram showing the overall configuration of FIG.
It is an enlarged view of the front-end | tip part of a braid | blade. As shown in FIG. 1, the coating apparatus 10 is mainly used.
In excess of the desired coating amount on the continuously running web 12
A pre-coating device 14 for applying the coating liquid,
And doctor blade 16 that scrapes off the surplus.
ing. The pre-coating device 14 is a backup device.
An example of an extrusion type coating head with a cap
However, the present invention is not limited to this.
14 with support rollers on the upstream and downstream sides of the web
Support press for pressing 12 to the pre-coating device 14
Stroke type, roll coater type, gravure coater
Type, roll coat plus doctor type, slide coat type
Etc. can be used. The pre-coating device 14 is mainly used as an extender.
A rouge-type coating head 22 and the coating head 22
The back is disposed in close proximity to the lip surface 24 at the tip of the
And an up roller 26. Within the application head 22
The part has a cylindrical pocket along the width direction of the web 12
28 is formed and the pocket 28 is removed from the pocket 28.
A slit 30 reaching the top surface 24 is formed. slit
30 is a narrow connecting the pocket portion 28 and the lip surface 24.
It is a flow path and extends in the width direction of the web 12. And
Coating applied to the pocket 28 of the coating head 22
The liquid is spread in the width direction of the web 12 in the pocket portion 28.
After that, the slit 30 is raised and discharged from the slit discharge port.
Is done. The discharged coating liquid is supplied to the backup roller 26.
The web 12 is supported continuously by the web 12 and the lip surface 24.
Applied to the web 12 while forming a bead between
The It should be noted that the coating liquid is fed to the pocket portion 28.
The other end side of the pocket portion 28 is closed and supplied from one side.
Supply method, supply from one side of the pocket 28 and the other end
Pull out from the side, supply from the center of the pocket 28
Thus, any of the methods of diverting to both sides may be used. The doctor blade 16 travels on the web 12.
It is arranged so as to be approximately perpendicular to the direction.
Backup roller 2 upstream of the blade 16
6. A support roller 18 is provided on the downstream side. Ba
The backup roller 26 and the support roller 18 are
-It is arranged at a position lower than the tip of the blade 16. This
As a result, the continuously running web 12 is
Pressed against the tip surface 32 of the web 16 and applied to the web 12
The excess of the applied coating solution is scraped by the doctor blade 16.
It will be dropped off. The doctor blade 16 is, for example, a superalloy.
Or fine ceramics, alumina A-150, jill
Cover the surface with a hard material such as Konia or these materials.
The surface is made up of R_maxso
The roughness is 0.5 μm or less, preferably 0.2 μm or less.
The surface is processed. Further, the distal end surface 32 of the doctor blade 16 is provided.
2 is formed in a curved shape as shown in FIG.
The incidence angle (θ_in0.5-2
Enter with lap in the range of °, and leave angle (θ
_out) As appropriate. This makes the doctor blade
The distance between the tip end surface 32 of the 16 and the web 12 is several μm or less.
Because it becomes possible to suppress, doctor blade 16
The coating layer thickness after being scraped off is 2 μm or less in a wet state.
Can be made extremely thin. The distal end surface 32 of the doctor blade 16 is curved.
The radius of curvature R1 is a curved surface of, for example, 1 to 30 mm,
The center of the curved surface is the downstream side of the running direction of the web 12
It is formed at a position close to the surface. The blade thickness L1 of the doctor blade 16
Is formed in a range of 1 to 30 mm. Blade thickness L1
By setting it in such a range, the coating liquid aggregates
Appropriate shearing force can be applied. Next, the coating apparatus 10 configured as described above is used.
The operation will be described. Application on the web 12 by the precoater 14
The applied liquid is scraped off by the doctor blade 16
In the meantime, a part of the solvent evaporates on contact with air. That
At the same time, highly cohesive coating solutions such as ferromagnetic metals and barium
In the case of a coating solution containing ferrite magnetic material,
Part may aggregate. This aggregate appears on the coated surface
Cause slight unevenness. This unevenness is very small
Therefore, there was no problem in the case of conventional coating thickness
However, when the coating is performed in a wet state with a thickness of 2 μm or less, the surface
Trouble occurs as rough. For this reason, conventional coating devices
In the wet state, a coating layer of 2 μm or less is smoothly formed in a wet state.
I couldn't. On the other hand, the coating apparatus 10 of the present embodiment.
The blade thickness L1 of the doctor blade 16 is 1 to 30 mm.
By making the range suitable shear for coating liquid agglomerates
Since it is loosened by applying force, it is possible to obtain a smooth coated surface
it can. That is, the blade thickness L1 is 1 mm or less as in the prior art.
In this case, the time for applying the shearing force is short.
The liquid agglomerates cannot be sufficiently loosened, resulting in surface roughness.
To do. Conversely, if the blade thickness L1 exceeds 30 mm,
The flow of the coating liquid between the end face 32 and the web 12 is poor.
As a result, the coating liquid accumulates on the doctor blade 16 and uneven coating occurs.
Cause. Therefore, the blade of the doctor blade 16
Application by making the thickness L1 in the range of 1-30 mm
A smooth coated surface can be obtained by loosening liquid agglomerates.
At the same time, it is possible to prevent uneven coating.
Yes. In this way, the coating apparatus 10 of the present embodiment has
According to this, the blade thickness L1 of the doctor blade 16 is 1 to 30 m.
m so that the agglomerates of the coating solution are sufficiently destroyed
A smooth coated surface can be obtained. It should be noted that an appropriate shear force is applied to the coating liquid aggregate.
To give a blade thickness L1 of 1 to 30 mm, preferably 3
~ 30mm is important and the shape of the cutting edge is necessary
Various shapes can be selected depending on the coating performance. The front end surface of the doctor blade 34 shown in FIG.
Is formed by two continuous planes 36 and 38.
ing. The angle θ1 formed by the two planes 36 and 38 is 18
Formed at less than 0 °, the plane 38 and the side surface 4 on the downstream side
The angle θ2 formed by 0 is 90 ° or slightly smaller than 90 °
It is formed at a large angle. In addition, the plane 36 and the plane 38
The continuous position is provided at a distance a from the side surface 42 on the upstream side.
It has been. Doctor blade 3 shaped as described above
4 is an inclination of the planes 36 and 38 from the upstream side to the downstream side.
The slope is gradually getting smaller. That is, from the upstream side to the bottom
The shear force gradually increases toward the flow side, and the coating solution is condensed.
The shape is effective to loosen up the collection. Figure
The tip surface shape shown in 3 has two planes,
Three or more may be used, and also in this case, from the upstream side to the downstream side
It is preferable that the inclination gradually decreases toward The front end surface of the doctor blade 44 shown in FIG.
Is formed by two continuous curved surfaces 46, 48.
The curved surface 46 on the upstream side is curved more than the curved surface 48 on the downstream side.
The rate is increasing. That is, the radius of curvature of the curved surface 46
R2 is formed smaller than the radius of curvature R3 of the curved surface 48.
ing. The doctor blade 4 thus formed
4, the shear force gradually increases from the upstream side to the downstream side.
It has an effective shape to loosen the coating liquid aggregates.
Yes. The tip surface shape shown in FIG. 4 has two curved surfaces.
However, it may be three or more.
The curvature gradually decreases from the flow side to the downstream side.
Good. The front end surface of the doctor blade 50 shown in FIG.
Is a combination of a curved surface 52 and a flat surface 54
Yes. That is, the upstream end of the flat surface 54 is connected to the side surface 56.
A rounded chamfered surface 52 at a distance b from
It has become. At the downstream end, the angle θ3 is an acute angle.
The coating liquid on the web 12 is formed on the side surface 5.
It has a shape that makes it difficult to climb up to 8. This
When the coating liquid is scraped off with the blade 50
La can be further reduced. The side surface 58
By bending the lower part outward, the doctor blade 50
Strength can be maintained. The doctor blade 5 formed as described above.
0 has a greater shear force at the curved surface 52,
Sufficient shear force is applied at the portion of the flat surface 54. Therefore
The shape is effective to loosen the coating liquid agglomerates.
The In this way, the doctor shown in FIGS.
Blades 34, 44, 50 loosen the aggregation of the coating liquid
Because the shape is effective, the coated surface is rough
Can be prevented. The doctor blade shown in FIGS.
34, 44, and 50 have a blade thickness L2, L3, L4 of 1 to 3
By setting it to 0 mm, surface roughness and coating unevenness can be prevented.
In addition, an extremely thin and smooth coating layer can be formed. By the way, this kind of scraping type
In the coating device, the coating liquid scraped off and collected
Once between the precoater 14 and the doctor blade
Since it is exposed to the atmosphere, the solvent in the coating solution volatilizes and the viscosity
And liquid properties such as solid content concentration change. Viscosity changes
If the applied coating liquid is reused as it is, the doctor blade
The amount of liquid scraped off by 16 or doctor blade 1
6 The final thickness of the coated film after 6 is adversely affected.
It must be reconstituted after the preparation of liquid properties such as form concentration
Cannot be used. Therefore, do you apply the coating liquid to the web 12?
Until the excess liquid is scraped off.
The coating liquid that is applied to the air is not released to the atmosphere.
(Hereinafter referred to as “atmospheric non-opening type coating device”)
It is preferable. FIG. 6 shows the pre-coating device 14 and the doctor blade.
The atmosphere 16 is configured with the lade 16 as one coating head.
It is an open type coating apparatus. As shown in FIG. 6, a non-atmospheric coating device is applied.
The device 110 mainly supports the running of the web 112.
Supporting roller 114, coating head 116, c
Apply a coating amount that is excessive than the coating amount applied to Ebb 112.
A supply line 118 for supplying to the head 116, and a coating liquid
And a recovery line 120 for recovering excess. In the coating head 116, there is a coating pocket.
A pair of cylinders composed of a portion 126 and a collection pocket portion 128
Pockets 126 and 128 are parallel to the web width direction
And the application pocket 126 is a supply line.
118 and a recovery pocket 128 is connected to the recovery line.
Connected to the network 120. Also, in the coating head 116
Is a coating spout having a discharge port 130A on the lip surface 124.
Lit 130 and web 112 than discharge port 130A
With a recovery port 132A on the downstream side as viewed from the direction of travel
A collecting slit 132 is formed, and a coating slip is formed.
130 is connected to the application pocket 126 for recovery.
The slit 132 communicates with the collection pocket 128.
The And it applies to the web 112 from the supply line 118
The coating liquid in excess of the desired coating amount is applied to the coating head 11.
6 is applied to the application pocket portion 126, and the recovery slip is provided.
The coating recovered in the recovery pocket 128 by the
The surplus of the cloth liquid is applied to the coating head 11 by the collection line 120.
6 is discharged. The support roller 114 is applied to the coating head 11.
A pair is provided on the upstream side and downstream side in the web running direction with 6 as a boundary.
At a lower position than the tip of the coating head 116.
Placed. As a result, the continuously running web 112 is coated.
It is pressed against the lip surface 124 side of the fabric head 116
Close to each other. [0043] Non-atmospheric coating having the above structure
In the device 110, the back lip constituting the lip surface 24
Surface 152, Doctor lip surface 154, Recovery lip surface 1
56, the block on which the recovery lip surface 156 is formed.
157 serves as the doctor blade 16. That is,
Excessively discharged from the discharge port 130A and thick on the web 112
The applied coating liquid is accompanied by the web 112 and collected.
It reaches the recovery port 132A of the slit 132 and is thickly coated.
Part, that is, the excess of the coating liquid is scraped by the recovery lip surface 156
Be dropped. Accordingly, the non-atmospheric coating device 110
In some cases, a block formed with a recovery lip surface 156
The blade thickness L5 of 157 is in the range of 1 to 30 mm, preferably
Coagulation of the coating liquid by making the range 3 to 30 mm
You can loosen things and get a smooth coated surface
In addition, it is possible to prevent the occurrence of coating unevenness.
In this case, the shape of the recovery lip surface 156 is the required application.
Select various shapes shown in Fig. 2 to Fig. 5 according to performance
Can do. In addition, this non-atmospheric coating apparatus 11
By using 0, the device can be simplified and
Since the solvent does not evaporate from the coating solution,
Available. Also, supply line 118 and recovery line 12
If a flow meter (not shown) is provided for each of
The application flow rate can be managed as a difference in amount. In addition, the recovery license
A suction pump (not shown) is provided on the
Suction pump for application liquid scraped through
If you use a vacuum, the coating thickness can be adjusted accurately.
The [0045] EXAMPLES Tables 1 to 3 show the surface roughness Ra of the coated surface.
Shows the test results of investigating the dependence of the blade thickness of the doctor blade
doing. In the test of Table 1, Daiko was used as a precoat.
Using a filter, paint A is 10 μm thick and 1000 mm wide
Coating at a coating speed of 200m / min on PEN base
The wet thickness was 30 μm. And the Doc in Figure 2
Scrape off surplus of paint A with tar blade 16
The film thickness was 1 μm by wet. Doctor blade 16
The radius of curvature R1 of the tip surface 32 of the blade is fixed to 15 mm, and the blade
Table 1 shows the results of testing while changing the thickness L1. In the tests of Table 2, the support as a precoat
Using a pressure die coater, paint C is 4μm thick and wide
Application speed 400m / m on 300mm aramid base
In application, the wet thickness was 10 μm. And
Scrape off excess paint A with the doctor blade 34 in FIG.
The final film thickness was set to 0.5 μm by wet. Doctor
-The angle θ1 of the blade 34 is 160 ° and the angle θ2 is 90
° Fix the distance a to 0.5mm and do not change the blade thickness L2.
Table 2 shows the test results. In the tests of Table 3, the support was used as a precoat.
Using a pressure die coater, the surface is 5 μm thick.
Paint B is applied as a dry film with a thickness of 2mm.
Paint C is applied on the PEN base at a coating speed of 400 m / min.
It was applied to a wet thickness of 10 μm. And in FIG.
The doctor blade 50 scrapes off the excess paint C,
The final film thickness was set to 0.5 μm by wet. Doctor blur
The radius of curvature R4 of the card 50 is 2 mm, the angle θ3 is 70 °,
While fixing the distance b to 0.5mm and changing the blade thickness L4
Table 3 shows the test results. The paints A to C are the same as those in the examples.
This will be explained later. [0050] [Table 1][0051] [Table 2] [0052] [Table 3] As can be seen from Tables 1 to 3, the blade thicknesses L1, L
2, In Comparative Examples 1, 2, 4 where L4 is smaller than 1 mm,
Although there was no coating unevenness, the surface roughness Ra of the coated surface was 2
The surface roughness was larger than 0 nm. Also blade
In Comparative Examples 3 and 5 where the thicknesses L2 and L4 are larger than 30 mm
Although the surface roughness of the coated surface was very small,
Unevenness occurred. On the other hand, in Examples 1-11,
The blade thicknesses L1, L2, and L4 are in the range of 1 to 30 mm.
There is no unevenness of the cloth or rough surface, and a good coated surface can be obtained.
Came. As another test, as a precoat
Using a support pressurizing die coater, the thickness is 5 μm,
Width 10 in which paint B is applied to the surface in a dry film of 0.8 μm
Coating speed 400m / min on 00mm PEN base
The coating material A was applied to a wet thickness of 10 μm. And
4 to remove excess paint A with the doctor blade 44 shown in FIG.
The final film thickness was 1.0 μm wet. Do
The radius of curvature R2 of the cutter blade 44 is fixed at 2 mm,
Table 4 shows the results of testing while changing R3 and blade thickness L3.
The [0055] [Table 4] As can be seen from Table 4, the blade thickness L3 was changed.
Even when the size of R3 changes, the blade thickness L3
Corresponding coating unevenness and surface roughness occurred. That is, the blade thickness L3
In Comparative Example 6 where the diameter is less than 1 mm, surface roughness occurs and the blade
In Comparative Example 7 where the thickness L3 is larger than 30 mm, uneven coating is observed.
In practice, the blade thickness L3 was 1-30 mm.
In Examples 12 to 15, good coated surface shapes were obtained. Next, paints A to C used in the examples.
explain. Each of the paints A to C is made of the following raw materials:
After kneading each component with a kneader,
Dispersed. Then, polyisocyanate is added to the obtained dispersion.
Add 10 parts of the acidate and add cyclohexanone as appropriate.
The viscosity at a shear rate of 10000 [1 / s] is a predetermined value.
Adjusted so that the filter has an average pore diameter of 1 μm
The solution was filtered using a filter to obtain a coating solution. Where the predetermined viscosity
As a value, paint A has a B-type viscosity of 4 Pa · s and a high shear viscosity.
The degree is 10 mPa · s, and the paint B has a B-type viscosity of 0.1.
Pa · s, high shear viscosity of 20 mPa · s, paint C
Has a B-type viscosity of 1 Pa · s and a high shear viscosity of 10 mPa · s.
s. This high shear viscosity is measured with a Rotovisco viscometer.
The viscosity is 40000 (1 / S). The raw material component of the paint A is a ferromagnetic metal fine powder.
100 parts as a vinyl chloride copolymer, MR110 (day
(Made by Zeon Corporation) 12 parts, UR8 as polyurethane resin
200 parts (manufactured by Toyobo), HIT5 as alpha alumina
5 (manufactured by Sumitomo Chemical Co., Ltd.) 10 parts as carbon black
55 (made by Asahi Carbon Co., Ltd.), 5 parts, phenylphosphonic acid 3
Parts, butyl stearate 10 parts, butoxyethyl stearate
5 parts rate, 3 parts isohexadecyl stearate, stearate
Arynoic acid 2 parts, methyl ethyl ketone 180 parts, cyclohexane
It was 180 parts of xanone. The raw material component of the paint B is a non-magnetic powder.
TiO₂Crystalline rutile (average primary particle size 0.035μ
m, specific surface area 40m by BET method²/ G, pH 7, T
iO₂Content 90% or more, DBP oil absorption 27-38g /
100g, surface treatment agent Al₂O _Three, 8% by weight) 80
Part, CONDUCTEX SC-U as carbon black
20 parts (made by Colombian Carbon), vinyl chloride
12 parts of MR110 (manufactured by Nippon Zeon Co., Ltd.) as a polymer
UR8200 (manufactured by Toyobo) as polyurethane resin
5 parts, 4 parts phenylphosphonic acid, butyl stearate
1 part, 3 parts stearic acid, methyl ethyl ketone /
250 parts of clohexanone (8/2 mixed solvent) was used. The raw material component of the paint C is barium ferrule
MR5 as 100 parts of ferromagnetic powder and vinyl chloride copolymer
55 parts (manufactured by ZEON CORPORATION) as polyurethane resin
UR8200 (Toyobo Co., Ltd.) 3 parts α-alumina
HIT55 (manufactured by Sumitomo Chemical Co., Ltd.) (particle size 0.2μ
m) 10 parts, carbon black # 55 (Asahi Car)
Manufactured by Bonn) (average primary particle size 0.075 μm, specific surface area)
35m²/ G, DBP oil absorption 81ml / 100g, pH
7.7, 1.0% volatile content), 1 part phenylphosphonic acid
2 parts, butyl stearate 10 parts, butoxyethyls
5 parts of tearate, 3 of isohexadecyl stearate
Part, stearic acid 2 parts, methyl ethyl ketone 125
Part, cyclohexanone was 125 parts. [0062] As described above, the coating device according to the present invention.
According to the setting, the blade thickness of the doctor blade is 1-30 mm
And apply an appropriate shear force to loosen the coating liquid aggregates.
So that it is very thin and less than 2μm in wet condition.
The fabric layer can be formed smoothly.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conceptual diagram showing the overall configuration of a scraping-type coating apparatus according to the present invention. FIG. 2 is a side view showing the tip of a doctor blade. FIG. 3 is a doctor blade different from FIG. FIG. 4 is a side view showing the tip of a doctor blade different from FIG. 2. FIG. 5 is a side view showing the tip of a doctor blade different from FIG. 2. FIG. 6 is another embodiment of the present invention. It is a block diagram of an air non-opening type coating apparatus. [Explanation of Symbols] 10 ... scraping type coating device, 12 ... web, 14 ...
Pre-coating device, 16 ... doctor blade, 18 ... support roller, 22 ... coating head, 24 ... lip surface, 26
... backup roller, 28 ... pocket part, 30 ... slit, 32 ... tip surface of doctor blade, 34 ... doctor blade, 36, 38 ... plane, 40, 42 ... side, 4
4 ... Doctor blade, 46, 48 ... Curved surface, 50 ... Doctor blade, 52 ... Curved surface, 54 ... Flat surface, 56, 58 ...
Side surface, 110 ... non-atmospheric coating device, 112 ... web, 114 ... support roller, 116 ... coating head, 1
DESCRIPTION OF SYMBOLS 18 ... Supply line, 120 ... Collection line, 124 ... Lip surface, 126 ... Application pocket part, 128 ... Collection pocket part, 130 ... Application slit, 132 ... Collection slit, 152 ... Back lip surface, 154 ... Doctor Lip surface, 156 ... Recovery lip surface

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Norio Shibata             2-1-12 Ogimachi, Odawara-shi, Kanagawa Prefecture             Shishi Photo Film Co., Ltd. F-term (reference) 2H023 EA01                 4F041 AA12 AB02 BA56 CA02 CA13                       CA22 CA28                 4F042 AA22 DD07 DD09 DD16                 5D112 CC10

Claims (1)

[Claims] [Claim 1] An application side surface of the support after applying a coating liquid in excess of a desired coating liquid amount to the support by a pre-coating device while continuously running the belt-like support. In the coating apparatus which presses a doctor blade relatively and scrapes off the excess of the said coating liquid, The said doctor blade is 1-30 mm in thickness of the running direction of the said support body, The coating apparatus characterized by the above-mentioned.