JP2003200105A - Coating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating apparatus capable of forming an extremely thin and even coating on a flexible support in scraping type coating. <P>SOLUTION: The coating apparatus 10 comprises a precoating apparatus 14 for applying a coating liquid in the amount exceeding a desired coating amount on a continuously moving web 12, a doctor blade 16 for scraping the excess amount of the coating liquid, and an expander roller 20 for preventing uneven tension of the web 12 at the position of the doctor blade 16. The expander roller 20 is positioned at a position where the distance D1 along the web 12 from the tip of the doctor blade 16 does not exceed 1,000 mm. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method, and particularly
Strips used in the manufacture of photographic materials and magnetic recording media
The present invention relates to a coating method in which a coating solution is coated on the support. [0002] Photosensitive materials and magnetic recording media are continuously run.
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
Demand for a magnetic layer with low film pressure
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. [Patent Document 1] Japanese Patent Publication No. 5-8065 [Patent Document 2] Japanese Patent No. 2614119 [0009]
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, it is applied in the width direction of the web.
Cloth unevenness sometimes occurred. This coating unevenness is
For the coating layer thickness required for the magnetic layer of magnetic recording media
Was not seen, and the coating layer thickness was extremely thin.
It has become obvious through the removal. Scraping off
This coating is required for ultra-thin and uniform coating with a mold coating device.
It is necessary to pursue the cause of unevenness and eliminate the cause.
is there. The present invention has been made in view of such circumstances.
Flexible support for scraping-off type application
Providing a coating method that can be applied to the body in an extremely thin and uniform manner
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 applying the coating solution, scrape the application side of the support
Relatively press the squeeze member to scrape the excess of the coating solution.
In the application method for scraping, the position of the scraping member
It is characterized by preventing the support from slipping in
ing. The inventor of the present invention has developed in the width direction of the support.
As a cause of uneven thickness, the position of the scraping member
We paid attention to the slippage of the support. The support material here
As shown in FIG. 10, the support means that the support is elastically deformed.
Is a longitudinal wrinkle generated by. Conventionally, support
Even if slight slippage occurs in the body, the coating layer is thick
Therefore, there was no significant effect on the coated surface. But very thin
Form a coating layer with a thickness of 2 μm or less in a wet state.
The effect of slippage at the scraping member position
, And even if there is a slight slip, it is directly shadowed on the coated surface.
I got the knowledge that it sounds. The present invention is based on this finding.
The support body at the position of the scraping member.
By applying a very thin and uniform coating.
is there. As a method for preventing slippage, for example,
Kispanda roller, grooved roller, edge guider, etc.
Place the anti-slip member close to the front and back of the scraping member
There is a way to do it. In this case, with respect to the running direction of the support
In a range not exceeding 1000 mm before and after the scraping member
By arranging the anti-leaking member, the scraping member
It is possible to effectively prevent the support from slipping in position.
The As another anti-slip method, support is provided.
Trollers, backup rollers, application heads, etc.
Proximity-preventing member is placed near the scraping member
There is a way to arrange. In this case, the direction of travel of the support
Range of 200mm before and after the scraping member
By placing a member with anti-slip effect in the enclosure
Effectively prevents the support from slipping at the position of the scraping member.
Can be prevented. 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. DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings.
A preferred embodiment of the coating method will be described in detail. FIG. 1 shows a scratch applied with the coating method of the present invention.
It is the conceptual diagram which showed the whole structure of the dropping type coating device 10.
2 is an enlarged view of the tip of the doctor blade.
The 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,
Doctor blade 16 that scrapes off the surplus, and doctor blade
Exhaust to prevent the web 12 from slipping at the position of the raid 16
It is comprised with the spander roller 20. FIG. Pleco
Extrusion with backup as a starting device 14
This will be explained using an example of an application head
Not upstream, but upstream and downstream of the precoater 14
A pair of support rollers is provided at the front and the web 12 is
Extrusion for pressurizing the support that presses against the rotation device 14
Type, roll coater type, gravure coater type, roll coater
Use Top Plus doctor type, slide coat type, etc.
You can. 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. So
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 substantially perpendicular to the direction.
Expander roller 2 on the upstream side of the cutter blade 16
0, a support roller 18 is provided on the downstream side. D
The kipanda roller 20 and the support roller 18
-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. Doctor blade 1 facing the web 12
As shown in FIG. 2, the tip surface 32 of 6 is 1-30 mm
It is curved with a curvature R, and the web 12 is applied to the distal end surface 32.
Incident angle (θ _in ) Wrapped in a range of 0.5 to 2 °
Approach and leave angle (θ _out ) As appropriate. This
As a result, the distal end surface 32 of the doctor blade 16 and the web
It is possible to keep the distance to 12 to 2 μm or less.
Then, the coating layer after being scraped off by the doctor blade 16
The thickness can be made very thin with 2 μm or less. The doctor blade 16 is, for example, super
Alloy or fine ceramics, alumina A-15
0, hard body such as zirconia, or at least the surface part
It consists of members coated with these materials.
The surface is R _max 0.5 μm or less, preferably 0.2 μm or less
Surface processed with the roughness below. The expander roller 20 is configured as shown in FIG.
In addition, the central part is curved downward. This
The web 12 wound around the spander roller 20 is wide.
The web is stretched with tension applied in the direction.
Twelve wrinkles, shrinkage, slipping, etc. are removed. The expander roller 20 is also shown in FIG.
As shown, the web 1 extends from the tip of the doctor blade 16.
Placed at a position where the distance D1 along 2 does not exceed 1000 mm
Is placed. Prevention of slippage by the expander roller 20
The effect is from the expander roller 20 along the web 12
In the range of 1000 mm. Therefore
The expander roller 20 has removed the slippage.
The position of the doctor blade 16 remains unchanged
It is conveyed to. That is, the position of the doctor blade 16
The web roller 12 at the position is expanded by the expander roller 20.
Can be prevented. In this way, the coating apparatus 10 of the present embodiment has
According to the upstream of the doctor blade 16 and the distance
Expander at a position where D1 does not exceed 1000mm
Since La 20 is arranged, the coating liquid is applied by the doctor blade 16.
Prevents web 12 from slipping when scraping off excess
be able to. Therefore, a very thin coating of 2 μm or less
Even when cloth is used, uniform application without uneven application
It can be carried out. The above-described embodiment is an expander.
The roller 20 is placed upstream of the doctor blade 16
However, it may be arranged on the downstream side. Expander roller 2
The anti-slip effect of 0 is on the expander roller 20
This is because it reaches the flow side. Again, the expander
Roll the roller 20 from the tip of the doctor blade 16 to the web 1
To be placed at a position not exceeding 1000 mm along 2.
Prevents slippage at the position of the doctor blade 16
can do. In addition, the above-described embodiment is a slip prevention hand.
The expander roller 20 was used as the step, but this
For example, as shown in FIG.
A roller 34 may be used. Grooved roller 3 shown in FIG.
4 on the surface of the web 12 from the center toward both ends.
A plurality of V shapes extending in the traveling direction are formed. This groove
When the web 12 is guided by the attached roller 34, the web 1
Both ends of 2 are pulled outward and tension is applied in the width direction
Since it is added, it is possible to remove the slippage of the web 12
Yes. Also, the grooved roller 34 is connected to the doctor blade 1
1000 m along the running direction of the web 12 from the tip of 6
If installed within m, the position of the doctor blade 16
The web 12 can be prevented from slipping. Another anti-slip means is shown in FIG.
As shown, a pair of edge guiders 36, 36 may be provided.
Yes. The pair of edge guiders 36 and 36 are respectively
The end of the hub 12 in the width direction is sandwiched between a pair of rollers 38 and 38.
And guide. As a result, the width direction of the web 12
Apply tension to remove web 12 slippage.
You can. Even when the edge guider 36 is used,
Along the running direction of the web 12 from the tip of the blade 16
Edge guider 36 in the range not exceeding 1000mm
The position of the doctor blade 16 by installing
It is possible to prevent the web 12 from slipping. It should be noted that the expander roller 20 and the grooved roller
Anti-slip means such as roller 34 and edge guider 36 are
You may be able to adjust the position along the web 12
Yes. FIG. 6 shows that the backup roller 26 is prevented from slipping.
The coating device 40 of 2nd Embodiment which serves as a stop means is shown.
It is a conceptual diagram. A coating apparatus 4 according to the second embodiment shown in FIG.
0, and the coating apparatus 10 of the first embodiment shown in FIG.
The difference is that there is no expander roller 20, and
Position of backup roller 26 and doctor blade 16
It is a point that the positional relationship is regulated. That is, the second actual
In the application device 40 according to the embodiment, the expander roller 20
And the backup roller 26 to the web 12
Doctor so that the distance D2 along does not exceed 200mm
A blade 16 is arranged. Backup roller 2
6 is the web 12 by winding the web 12.
It has the effect of removing slippage from the
Up to 200mm downstream of the backup roller 26
Can be effectively obtained. Thus, the coating apparatus 4 according to the second embodiment.
0 means that the backup roller 26 removes the web 12
Paying attention to the effect of removing, backup roller
Since the doctor blade 16 is provided in the vicinity of
Prevents slippage of the web 12 at the position of the blade 16
Can. This makes it extremely thin with a thickness of 2 μm or less.
A coating layer can be formed uniformly. Application equipment
40, the doctor for the backup roller 26
-Adjusting the relative position of the blade 16
New anti-slip means such as the spander roller 20 are provided.
There is no need. The second embodiment is a backup.
Roller 26 was used as a means to prevent slipping, but support
The roller 18 may be used as a slip prevention means. sand
That is, in the coating device 40 of FIG.
8 and the distance between the doctor blade 16 and the web 12
The separation D3 may be set to a value not exceeding 200 mm.
The support roller 18 starts from the wound web 12.
There is an effect to remove the slip, the anti-slip effect is support
Effectively obtained in the range of 200 mm upstream of the roller 18
It is. Therefore, the doctor blade 16 is supported
By installing it within the range of 18 to 200 mm
The web 12 at the position of the doctor blade 16
Can be prevented, and uniform coating can be performed. In the coating apparatus 40 shown in FIG.
Set distance D2 and distance D3 to 200mm or less at the same time
And more uniform coating. The backup roller 26 and doctor
Another support roller (not shown) between the blade 16
From the support roller.
The distance along the web 12 to the raid exceeds 200 mm
It is good to avoid it. Anti-slip effect of support roller
Because the fruits reach the 200 mm downstream
The FIG. 7 shows that the application head 44 is provided with anti-slip means.
It is a conceptual diagram which shows the coating device 42 of 3rd Embodiment which also serves
is there. As shown in the figure, the coating of the third embodiment is applied.
The cloth device 42 includes a pair of support rollers 46 and 46 and a pair of support rollers 46 and 46.
The coating roller disposed between the pair of support rollers 46, 46
It is composed of a cloth head 44 and a doctor blade 16.
A pair of support rollers 46, 46 are provided for the application head 44.
Disposed below the tip and the tip of the doctor blade 16
Is placed. Therefore, the lip of the tip of the coating head 44 is
The top surface 24 and the distal end surface 32 of the doctor blade 16 are a pair.
Continuously run around the support rollers 46, 46
Against the web 12 to be pressed. This
The coating liquid is applied to the continuously running web 12,
Once the coating solution has been exposed to air, the excess will be doctor-blurred.
It is scraped off by the card 16. The doctor blade 16 also has a coating head.
The distance D4 along the web 12 from the tip of the web 44 is 200.
It arrange | positions so that it may not exceed mm. Application head 44
Is pressed against the web 12 relatively.
It has the effect of removing the crevice of Eb 12, and its anti-claw effect
The fruit is effective along the web 12 in the range of 200 mm.
Can be obtained. Therefore, the doctor blade 16
Place within 200mm from the coating head 44
The wafer at the position of the doctor blade 16
It is possible to prevent the tab 12 from slipping. This
An extremely thin and uniform coating without unevenness in the cloth can be performed. In the coating apparatus shown in FIG.
Along the web 12 of the raid 16 and the support roller 46
If the distance D5 is also set to 200mm or less, support low
Since the anti-slip effect by the la 46 is also obtained, more uniform
Application can be performed. The first to third embodiments described above are
Scraping member that scrapes off excess coating liquid and measures it
Doctor blade 16 is used as (applicator)
However, the present invention is not limited to this. For example, FIG.
In the coating apparatus 42 of the third embodiment shown in FIG.
Instead of doctor blade 16, scraping rod-shaped
This is a coating apparatus that uses the member 48. Rod-shaped scraping
The dropping member 48 is disposed in parallel with the width direction of the web 12.
A cylindrical rod 50 and the rod 50 supported
The web 12 is formed on the rod 50.
The contact is made with a predetermined wrap angle. This
Excess of coating liquid applied from the coating head 44
The amount is scraped off by the rod 50, and the desired amount of coating liquid
Is weighed. In this case, the rod 50 is attached to the web 12.
Rotates in the same direction as the running direction of the web 12 by contact
You may make it not to rotate. Ah
Alternatively, the rod 50 is connected to a rotational drive source (not shown),
Rotate in the opposite direction to the running direction of the web 12
Also good. Moreover, as the rod 50 used here,
Remove the flat rod and wire with a flat outer surface.
Wire-type rod tightly wound around the circumference, around the circumference
It is possible to use a groove engraved type rod etc.
it can. The coating apparatus shown in FIG. 8 is a rod type scraper.
Along the web 12 between the dropping member 48 and the coating head 44
By setting the distance D4 to a value not exceeding 200 mm
The web 12 at the position of the scraping member 48
Prevents slipping and enables ultra-thin and uniform application.
You can. It should be noted that the rod type scraping shown in FIG.
The member 48 is a coating apparatus according to the first embodiment shown in FIG.
10 and the coating apparatus 40 of the second embodiment shown in FIG.
It can also be applied to. That is, the doctor of FIG.
A rod-shaped scraping member 48 instead of the blade 16
And set D1 within 1000mm, or
Rod-shaped scraping instead of 6 doctor blades 16
And the member 48, and D2 and D3 are within 200 mm.
This makes it possible to apply an extremely thin and uniform coating.
The By the way, such a scraping type
In the coating device, the coating liquid scraped off and collected
Between the precoat device 14 and the doctor blade 16
Since it is once exposed to the atmosphere, the solvent in the coating solution will volatilize.
Liquid physical properties such as viscosity and solid content concentration change. Viscosity
If the changed coating liquid is reused as it is, the doctor
The amount of liquid scraped off by the card 16 or the doctor blade
Since the final thickness of the coating film after coating 16 is adversely affected, the viscosity
And liquid preparation such as solid content concentration
Cannot be reused. Therefore, apply the coating liquid to the web 12.
Until the excess coating liquid is scraped off,
The coating liquid applied to the web 12 is not released to the atmosphere.
With a cloth device (hereinafter referred to as “non-atmospheric coating device”)
Preferably there is. FIG. 11 shows a pre-coating device 14 and a doctor.
The atmosphere in which the blade 16 is configured as one application head.
The support roller 114 is placed on the web in a non-open type coating device.
Incorporated as a means to prevent 112 slippage
is there. As shown in FIG. 11, non-atmospheric coating
The device 110 mainly supports the running of the web 112.
Supporting roller 114 to be applied, coating head 116,
Apply a coating amount that is excessive than the coating amount applied to the web 112.
Supply line 118 supplied to cloth head 116 and coating liquid
And a recovery line 120 for recovering an excessive amount. 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. Also, the collection slit 132 and the downstream side
Distance of the support roller 114 along the web 12
D6 is set to a value not exceeding 200 mm. [0048] 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. At this time, the recovery slit 132 and the downstream side
Distance D along the web 12 with the support roller 114
6 is set to a value that does not exceed 200 mm.
The trawler 114 is pulled from the wound web 112.
It has the effect of removing the damage, and its anti-slip effect is
Effectively obtained within 200mm upstream of Troller 114
It is. Therefore, the downstream support roller 114 is moved to the coating.
200 mm from the collection slit 132 of the lid 116
By installing it in the enclosure,
The web 12 can be prevented from slipping at the position, and uniform coating is performed.
I can. In addition to setting this distance D6,
Distance between slit 132 and upstream support roller 114
If the separation D7 is also set to 200 mm or less, more uniform application
It can be performed. Note that the non-atmospheric coating device 11
As a means for preventing the slippage of the web 112 to be incorporated into 0,
It is not limited to the support roller 114
Expander roller 20, grooved roller 34, pair
The edge guider 36 may be used. These threads
When using prevention means, the recovery slit 132
No more than 1000mm along the running direction of Eb 112
Install in range. 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
A suction pump for the coating liquid scraped off through
If you use a vacuum, the coating thickness can be adjusted accurately.
The Table 1 shows examples and ratios in the coating apparatus shown in FIG.
A comparative example is shown. Table 1 uses a die coater
The paint A is 100 μm thick and 600 mm wide.
Wet thickness 2 at a coating speed of 100 m / min.
Application of 0 μm was performed. And doctor blade, scan
Moods bar (flat rod), wire bar (Y
Yard type rod) and other applicators
The final film thickness was set to 2 μm by scraping. Of FIG.
Table 1 shows the shape of the coated surface when the distances D2 and D3 are changed.
As the doctor blade, the one shown in FIG.
That is, a doctor with a thickness of 1.5mm and a curvature of 4mm at the tip.
-Blade). The smooth bar is made of carbide.
Φ1.5mm, the wire bar has an outer diameter of 3mm,
A wire having a winding diameter of 80 μm was used. In addition, application of Table 1
As the evaluation of the surface condition, ◎… very good, ○… good, △…
There was no problem as a product. Also paint
A will be described at the end of the embodiment. [Table 1] As shown in Table 1, the distances D2 and D3 are set to 22
In Comparative Example 1 where the thickness is 0 mm, uneven thickness occurs on the coated surface.
I was alive. In contrast, the distance D2 is as short as 180 mm.
Example 1 and the implementation in which the distance D3 was shortened to 180 mm
In Example 2, the coated surface is good enough that there is no problem as a product.
Turned into. In Example 3, both the distances D2 and D3 are set.
It is shortened to 180mm, and a good coated surface is obtained.
It was. Example 4 in which the distances D2 and D3 were set to 90 mm
Then, a very good coated surface shape was obtained. Further, as an applicator, a flat bar
The same tendency is seen when using wire bars
It was. That is, the comparison in which the distances D2 and D3 are 220 mm
In Examples 2 and 3, coating unevenness occurred on the coated surface.
On the other hand, Examples 5 and 6 in which the distances D2 and D3 are 180 mm are used.
Then, a good coated surface shape was obtained. Thus, in order to obtain a good coated surface shape
Is at least one of the distances D2 and D3 of 200 mm or less
Preferably both distances D2 and D3 are 200
mm or less, more preferably both are 90 mm
The following is desired. Table 2 shows examples of the coating apparatus shown in FIG.
A comparative example is shown. In Table 2, the thickness is 5 μm.
Width 1000 where paint B is applied as a dry film at 2 μm on the surface
Die coater with pressure support on mm PEN base
Is used to apply paint A at a coating speed of 200 m / min.
The coating thickness was 10 μm. And Doctor Bray
Applicators such as cable, flat bar, wire bar
Scrape off any excess paint using
1 μm. Application when D4 and D5 in Fig. 7 are changed
The planar results are shown in Table 2. In Table 2, Example 12
Is an extractor 800mm upstream of the applicator.
Example 13 is the result of installing a roller.
Edge guider at 900mm downstream of the locator
It is the result of installing. Doctor blade,
The bar and wire bar used in the examples in Table 1
The same one was used. For paint B, the example
I will explain at the end. Table 2 shows the evaluation of the coated surface condition.
It is the same as that. [Table 2] As can be seen from Table 2, the applicator
Regardless of type, Comparative Example 4 to 220 with a distance D4 of 220 mm
In FIG. 6, the coating thickness distribution occurred on the coating surface,
Example 7 in which the distance D3 was 180 mm or 100 mm
In ˜13, a good coated surface shape could be obtained. Special
Furthermore, not only the distance D4 but also the distance D5 is set to 100 mm.
In Example 9, a very good coated surface shape was obtained. Also,
Even when the distances D4 and D5 are 180 mm,
Example 12 provided with a kipanda roller or edge guider
In Example 13 provided with a-, a very good coated surface was obtained.
It was. The paints A and B used in the examples are as follows.
I will explain. The coating materials A and B are the following raw materials:
After kneading each component with a kneader,
Dispersed. Then, polyisocyanate is added to the obtained dispersion.
10 parts of nate and 40 parts of cyclohexanone
In addition, filter using a filter with an average pore size of 1 μm.
The coating solution was adjusted. Each component of the raw material of paint A is ferromagnetic metal fine powder
100 parts of powder, MR110 as vinyl chloride copolymer
12 parts (manufactured by Nippon Zeon) as polyurethane resin
3 parts of UR8200 (Toyobo Co., Ltd.) as α-alumina
10 parts of HIT55 (Sumitomo Chemical Co., Ltd.), carbon black
# 55 (Asahi Carbon Co., Ltd.)
3 parts sulfonic acid, 10 parts butyl stearate, butoki
5 parts ciethyl stearate, isohexadecyl stearate
3 parts rate, 2 parts stearic acid, methyl ethyl keto
180 parts and cyclohexanone 180 parts. The raw material component of the paint B is a non-magnetic powder.
TiO ₂ Crystalline rutile (average primary particle size 0.035μ
m, specific surface area 40m by BET method ² / G, pH 7, T
iO ₂ Content 90% or more, DBP oil absorption 27-38g /
100g, surface treatment agent Al ₂ O _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. As described above, the coating method according to the present invention.
According to the law, expander rollers, grooved rollers, edges
Before and after scraping off anti-slip members such as jig guides
Set up on backup roller, support roller, coating
Scrape off materials that have an anti-slip effect such as cloth heads
Since it is placed close to the front and back of the member, the scraping member
It is possible to prevent slippage of the support at the position and uneven coating.
It is possible to perform uniform and ultra-thin coating without any problems.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conceptual diagram showing the overall configuration of a coating apparatus according to a first embodiment to which a coating method of the present invention is applied. FIG. 2 is a side view showing the tip of a doctor blade. FIG. 4 is a perspective view showing a grooved roller. FIG. 5 is a perspective view showing an edge guider. FIG. 6 is a coating apparatus according to a second embodiment to which the coating method of the present invention is applied. FIG. 7 is a conceptual diagram showing the overall configuration of a coating apparatus according to a third embodiment to which the coating method of the present invention is applied. FIG. 8 is a schematic view of the coating apparatus to which the coating method of the present invention is applied. FIG. 9 is a conceptual diagram showing the overall configuration of a coating apparatus using a rod-type scraping member. FIG. 9 is a side view showing a doctor blade used in the examples. FIG. 10 is an explanatory view of a slip. In an embodiment, a support low is applied to a non-atmospheric-type coating device FIG. 10 is a block diagram of a coating apparatus incorporating a mechanism for preventing web slippage by a roller. DESCRIPTION OF SYMBOLS 10... Coating apparatus according to the first embodiment, 12.
4 ... Pre-coating device, 16 ... Doctor blade, 18 ...
Support roller, 20 ... Expander roller, 22 ... Application head, 24 ... Lip surface, 26 ... Backup roller, 28 ... Pocket, 30 ... Slit, 32 ... End face of doctor blade, 34 ... Grooved roller, 36 ... Edge Guider, 38 ... roller of edge guider, 40 ... coating device of the second embodiment, 42 ... coating device of the third embodiment, 44 ... coating head, 46 ... support roller,
48 ... Rod type scraping member, 50 ... Rod, 52
... Support member, 110 ... Non-opening type coating apparatus, 112
... Web, 114 ... Support roller, 116 ... Coating head, 118 ... Supply line, 120 ... Collection line, 124
... Lip surface, 126 ... Application pocket, 128 ... Recovery pocket, 130 ... Application slit, 132 ... Recovery slit, 152 ... Back lip surface, 154 ... Doctor lip surface, 156 ... Recovery lip surface

─────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme code (reference) G11B 5/842 G11B 5/842 Z // B05C 5/02 B05C 5/02 11/04 11/04 13 / 02 13/02 (72) Inventor Tokuo Shibata 2-12-1 Ogimachi, Odawara-shi, Kanagawa Prefecture F-term in Fuji Photo Film Co., Ltd. (reference) 2H023 EA00 4D075 AC02 AC53 AC54 AC72 AC77 AC84 AC88 AC92 BB92Z CA24 DA03 DA04 DB53 DC27 DC28 EA07 EB15 EB38 4F041 AA12 AB02 BA56 CA02 CA13 CA22 CA28 4F042 AA22 DD07 DD09 DD17 DD41 DD45 DF03 DF19 DF20 5D112 CC10

Claims (1)

[Claims] [Claim 1] An application side surface of the support after applying a coating liquid more than a desired amount of coating liquid on the support by a pre-coating device while continuously running the belt-like support In the coating method in which the scraping member is relatively pressed to scrape off the excess of the coating solution, the support is prevented from slipping at the position of the scraping member.