JPH0739801A - Coating applicator - Google Patents

Abstract

PURPOSE:To substantially prevent the generation of undesired deformation, wear and adhesion of worn powder with simple constitution and to form a coating layer having a uniform thickness by providing the coating applicator with a fluid supplying means for supplying fluid to non-coating parts on the upstream side and/ or downstream side of an applying means for applying a coating material to a flexible base. CONSTITUTION:Solvent supplying parts 11, 11 are brought into contact with regions 6C, 6C which are the non-coating parts at both side edges of an uncoated base film 6A between guide rollers 8 and a die 1 on the upstream side, by which a solvent is applied to the film. The uncoated base film 6A traveling along the surface of the front blade 4 and a smoothing blade 5 is coated with the magnetic coating material 10 extruded from a slit 3, by which the coated base film 6B is formed. Then, the layer of the magnetic coating material 10 is formed in the coating part 6a of the base film 6A is formed just before the smoothing blade 5. The solvent 14 is previously applied on the non-coating parts 6b, 6b and an incident that the direct contact of the non-coating parts 6b, 6b with the smoothing blade 5 is averted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating device, for example, a coating device used for coating a base film with a magnetic paint.

[Prior art]

In a magnetic recording medium such as a magnetic tape, a wide base film is coated with a magnetic coating material in which magnetic particles are dispersed in a binder resin and dried to form a magnetic layer, which is then cut into a predetermined width. Obtained. The wide base film before cutting is coated with the non-coated portions at both side edge portions left. The coating method is generally roll coating, gravure coating, extrusion coating, or the like. Above all, the extrusion coating is preferable because a uniform coating film thickness can be obtained.

For example, in the extrusion-type die coating method, the front blade surface and the smoothing
While continuously extruding the magnetic paint from the slit on the base film that runs continuously along the blade surface,
Apply magnetic paint to the surface of the base film.

FIG. 28 is a schematic perspective view showing the procedure of applying a magnetic coating material by an extrusion die. Die 1
Has a pocket 2 which is a paint reservoir for the magnetic paint 20 supplied from a paint supply pump (not shown), and a slit 3 which is continuous with the pocket 2. The surface and the surface of the smoothing blade 5 are formed. At both ends of the slit 3, spacers 7, 7 are fitted so that the magnetic paint is not supplied to the non-coated portions 6b, 6b of the base film, and coating portions are formed between the spacers 7, 7.

The base film 6 is the front of the die 1.
An uncoated base film 6A running continuously along the surface of the blade 4 and the surface of the smoothing blade 5.
Then, the magnetic coating material extruded from the slit 3 is drawn between the surface of the smoothing blade 5 and the base film 6A, so that coating is performed and the coated base film 6B is obtained.

FIG. 29 is a sectional view taken along line XXIX-XXIX in FIG. The base film 6 is usually 5 to 15 kg / 620 m
Although the vehicle runs with a tension of m 2, it does not come into direct contact with the smoothing blade 5 because it floats on the smoothing blade 5 by the magnetic coating material 10 in the coating portion 6a.

However, since the magnetic paint is not applied to the non-coated portions 6b and 6b at both ends of the base film 6, the non-coated portions 6b and 6b are continuously in direct contact with the spacer 7 and the ridges of the smoothing blade 5. To do. As a result, the non-coated portions 6b and 6b are rubbed against the spacer 7 and the ridges of the smoothing blade 5 and are worn away.
Problems like: These problems are serious problems especially in the manufacture of magnetic tapes for video.

As shown in FIGS. 30 and 31, abrasion powder 80 accumulates on the smoothing blade 5 and lifts the non-coated portions 6b, 6b of the base film 6 to cause swelling, resulting in uneven coating.

When the abrasion powder 80 is scattered on the die 1, streak failure occurs. Therefore, in order to prevent streak failure, the coating is interrupted and cleaned, which is inconvenient in production.

The abrasion powder 80 is the coating portion 6a of the base film.
If it adheres to, it will cause dropout.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and undesired deformation and wear,
Further, it is an object of the present invention to provide a coating device having a simple structure, in which abrasion powder does not adhere and a coating layer can be formed with a uniform thickness.

[0012]

The present invention has the following constitution in order to achieve the above object.

According to the present invention, a coating means for coating a coating on a relatively traveling flexible support and an uncoated portion of the flexible support on the upstream side and / or the downstream side of the coating means. And a fluid supply means for supplying a fluid to the coating apparatus.

Further, the present invention has the above-mentioned coating means,
The coating device is provided with a lubricant supply means for supplying a lubricant to the non-application portion of the flexible support.

In the present invention, it is desirable that the fluid be a solvent, a lubricant, water or a pressurized fluid.

Further, in the present invention, there is provided contact pressure adjusting means for adjusting the contact pressure of the flexible support to the applying means such that the contact pressure is small at the non-application portion and is large at the application portion. It is desirable to be provided on the upstream side and / or the downstream side of the coating means.

Further, in the present invention, coating is performed by an extrusion die for coating the coating while extruding the coating from the slit on the flexible support which continuously runs along the front blade surface and the smoothing blade surface. It is preferable that the means is configured and a non-application portion is formed at a side edge of the application width of the flexible support.

[0018]

EXAMPLES Examples of the present invention will be described below. Each of the following examples is an example of an apparatus for applying a magnetic paint to a wide base film.

1 to 7 show a first embodiment of the present invention. FIG. 6 is a front view of a main part of an apparatus for applying a magnetic coating material to a wide base film to form a magnetic layer and subsequently drying the magnetic layer.

The base film 6 is wound around a payout shaft 31, and while being paid out, a magnetic layer is formed by coating and then wound around a takeup shaft 32. A calendar processing unit 20 including a guide roller (guide roll) 8, a coating die 1, a guide roller 8, a drying unit 19 and a multi-stage roll 21 is arranged in this order between the feeding shaft 31 and the winding shaft 32. ing.

When the take-up shaft 32 is rotated by a driving device (not shown), the pay-out shaft 31 is driven, and the uncoated base film 6A wound around the take-up shaft 31 is guided by the guide rollers 8 and 8 so that the base film 6A is guided to the die. 1 along the surface of the front blade 4 and the surface of the smoothing blade 5.

As described above, the uncoated base film 6A is coated with the magnetic paint by the die 1, and the coated base film 6B is passed through the drying section 19 and the calendar processing section 20 and then the winding shaft 32. To be wound up. The magnetic paint consists of the following components.

In the present example, to form the magnetic layer, for example, magnetic powder is dispersed in a binder, and ethers, ketones, aromatic hydrocarbons, aliphatic hydrocarbons, A magnetic paint is prepared by kneading with an organic solvent selected from chlorinated hydrocarbons, and the magnetic paint is applied to the surface of the non-magnetic base film, dried, and calendered. In this example, methyl ethyl ketone is used as the solvent.

As the magnetic powder used in this example, any conventionally known magnetic powder can be used. It is possible to use oxide magnetic powders, which include
For example, γ-Fe ₂ O ₃ , CO-containing γ-Fe ₂ O ₃ , Co deposited γ-Fe
₂ O ₃ , Fe ₃ O ₄ , Co-containing Fe ₃ O ₄ , Co-deposited Fe ₃ O ₄ , CrO _{2 and the} like can be mentioned. Further, hexagonal ferrite such as barium ferrite, iron carbide such as Fe ₅ C ₂ and iron nitride can also be used.

Further, as usable metal magnetic powders,
For example, Fe, Co, Ni, Fe-Co, Fe-Ni, Fe-Co-Ni, Co
-Ni, Fe-Co-B, Fe-Co-Cr-B, Mn-Bi, Mn-Al,
Fe-Co-V and the like can be mentioned, and further, metal components such as Al, Si, Ti, Cr, Mn, Cu and Zn may be added for the purpose of improving these various characteristics.

As the above-mentioned binder, a modified or non-modified vinyl chloride resin, polyurethane resin or polyester resin can be used or mixed, and further, a fibrin resin, a phenoxy resin or a heat having a specific usage method. You may use together plastic resin, thermosetting resin, reaction type resin, electron beam irradiation hardening type resin, etc. The group introduced for the above modification can improve the dispersibility of the magnetic powder --SO.
₃ M, -OSO ₃ M, -COOM, -PO (OM ') _{2 and the} like (M
Is an alkali metal atom such as Na, M'is the same alkali metal atom or an alkyl group).

As the usable fibrin resin, cellulose ether, cellulose inorganic acid ester, cellulose organic acid ester and the like can be used. Phenoxy resin has advantages such as high mechanical strength, excellent dimensional stability, good heat resistance, water resistance, chemical resistance, and good adhesiveness.

Further, it is preferable to add a curing agent to such a binder in order to further improve durability. As this curing agent, a polyfunctional isocyanate can be used, and particularly tolylene diisocyanate (T
The DI) system is preferred. The addition amount of the curing agent is preferably 5 to 30% by weight based on the total amount of the binder.

In the magnetic recording medium of this example, in addition to the binder, barium titanate and magnetic powder,
If necessary, a dispersant such as lecithin, a lubricant such as stearic acid ester, an antistatic agent such as carbon black, and an anticorrosive agent may be added. As the dispersant, the lubricant, the antistatic agent and the rust preventive, any conventionally known material can be used, and the dispersant is not limited at all.

As the non-magnetic base film usable in this example, polyesters such as polyethylene terephthalate and polyethylene-2,6-naphthalate, polyolefins such as polypropylene, cellulose derivatives such as cellulose triacetate and cellulose diacetate, Examples include plastics such as polyamide and polycarbonate. Further, metals such as Cu, Al and Zn, glass, boron nitride, ceramics such as Si carbide and the like can also be used.

An intermediate layer or an undercoat layer may be provided on the surface of the non-magnetic base film in order to improve the adhesiveness of the magnetic layer.

On the surface of the non-magnetic base film opposite to the magnetic layer, a non-magnetic powder (eg silica, carbon black) and a binder (similar to those mentioned above) are used to improve the running property of the medium. A back coat layer of 0.4 to 0.8 μm thick.

FIG. 7 shows an air recording medium (before cutting of a magnetic tape for video) according to this example. That is, a magnetic layer 10 containing magnetic powder, barium titanate powder, a binder and the like is provided on one surface of the coating portion 6a of the non-magnetic base film 6. Further, a back coat layer 15 mainly composed of non-magnetic powder and a binder is provided on the other surface. A layer of methyl ethyl ketone 14 as a solvent is formed on the non-coated portions 6b of the base film 6 on both sides of the magnetic layer 10 and the back coat layer 15, which will be described later.

An example of the composition of the magnetic paint is as follows. Raw materials having the following composition are mixed in a ball mill for 48 hours. Magnetic powder: Co-γ-Fe ₂ O ₃ (specific surface area BET value = 45 m ² / g) 100 parts by weight Binder: Polyurethane resin (containing polar group --COOH and --SO ₃ Na) 5 parts by weight Polyurethane resin (polar group-- SO ₃ Na included) 5 parts by weight (“UR-8300” manufactured by Toyobo Co., Ltd.) 7 parts by weight of nitrocellulose Abrasive: BaTiO ₃ 0.5 to 20 parts by weight of average particle size 0.5 to 1.5 μm Carbon (average particle size) 25 nm) 5 parts by weight Lubricant: butyl stearate 1 part by weight Solvent: (methyl ethyl ketone: methyl isobutyl ketone 228 parts by weight: toluene = 1: 1: 1)

After adding 5 parts by weight of a curing agent (Coronate L), the magnetic coating material obtained above was applied to a polyethylene terephthalate film having a thickness of 14 μm to a thickness of 5 μm. Then, a calendar process and a curing process are performed, and a coating material for a back coat layer, which is generally used generally, is applied to the opposite surface, and then cut into a width of 8 mm to prepare a magnetic tape.

FIG. 1 is a perspective view around the die, FIG. 2 is a partially enlarged view of FIG. 1, FIG. 3 is a perspective view showing the relationship between the base film and the die, and FIG. 4 is a side sectional view of the same. The magnetic paint 10 is pressure-fed from the magnetic paint supply pump 9 to the pocket 2 and is primary-rectified in the width direction in the pocket 2. The slit 3 has a gap (usually 0.1 to 0.3 mm) continuous to the pocket 2 and is processed and adjusted with high accuracy so that the flow of the magnetic paint in the width direction is secondarily rectified so that a uniform coating thickness can be obtained. Has become.

What should be noted in this example is that the uncoated base film 6 is provided between the upstream guide roller 8 and the die 1.
The solvent supply parts 11, 11 contact the areas 6c, 6c (shown by phantom lines) which are non-application parts on both side edges of A, and the solvent 14 is applied to the areas 6c, 6c. As shown in FIGS. 2 and 4, the solvent supply unit 11 includes a coating section 11a made of felt at the tip and a support section 11b for supporting the coating section 11a. It is supplied to the coating unit 11a. Then, the solvent 14 that has soaked in the felt of the coating portion 11a is in the area 6
applied to c.

The uncoated base film 6A running along the surface of the front blade 4 and the surface of the smoothing blade 5 is the magnetic paint 10 extruded from the slit 3.
Is applied to the back surface of the base film to form the applied base film 6B. The regulation of the coating width is as described above.
It is made by a pair of spacers 7, 7.

FIG. 5 is a sectional view taken along line VV of FIG. Just before the smoothing blade 5, a layer of the magnetic coating material 10 is formed on the coating portion 6a of the base film 6, and in the non-coating portions 6b and 6b on both sides thereof, the solvent 14 is removed by the solvent supply portion 11 of FIGS. Since it is applied in advance, it is possible to avoid the situation where the non-applied portions 6b, 6b of the base film directly contact the smoothing blade 5 as shown in FIG.
Therefore, abrasion powder is not generated due to this contact, the abrasion powder is not accumulated, and the base film is not deformed due to abrasion powder accumulation.

In this example, the solvent 14 is the methyl ethyl ketone used as the solvent in the above-mentioned magnetic paint (a mixed solvent of methyl ethyl ketone, anone and toluene can also be used).

Therefore, even if the solvent applied to the non-application area 6c of the base film in the solvent supply section 11 enters the application section 6a, this solvent is of the same kind as the solvent in the magnetic paint. Therefore, it does not cause any trouble. In addition, the area 6c of the base film is smoothed.
Even if the blade comes into contact with the blade, the contact pressure is slight and the abrasion powder is not generated.

Further, by supplying the same kind of solvent as the solvent in the magnetic paint, the solvent can be supplied from the magnetic paint component adjusting step, so that the solvent supply route is simplified. Further, it is not necessary to clean the die for removing accumulated abrasion powder, and continuous coating for a long time becomes possible.

The formation of the back coat layer 15 in FIG. 7 is also carried out by the extrusion coating in the same manner as the formation of the magnetic layer 10 described above.

The effect of this example will be specifically described by experiments as follows.

Width of 620 mm, thickness of 14.5 μm on the base film
Using polyethylene terephthalate film for video tapes, running tension 10-15kg / 620mm, running speed 250m /
And the magnetic coating for VHS has a thickness of 4μ after drying.
It was applied so that it would be m. The solvent to be supplied to the non-coating portion was two kinds of solvents, methyl ethyl ketone and a mixed solvent of methyl ethyl ketone / anone and toluene.

For the purpose of comparison, when the above experiment was conducted without supplying a solvent, a large amount of abrasion powder was generated, and swelling and streaks of non-coated portions were frequently generated due to accumulation of abrasion powder. On the other hand, in the experiment in which the solvent was supplied, wear of the non-coated portion was not observed in both of the two kinds of solvents, and extremely good results were obtained. If the amount of solvent supplied is very small and the solvent slightly adheres to the non-coated part, both types of solvent will cause some abrasion, and the bulging and streak failure of the non-coated part will not occur, which is a practical problem. Was not. If the amount of solvent supplied was too large, the solvent overflowed and uniform coating was not performed.

The above example is an example in which the solvent supply section is arranged on the upstream side of the die, but conversely, the solvent supply section can be arranged on the downstream side of the die. FIG. 8 is a perspective view (a perspective view similar to FIG. 1) showing such an example.

In the example of FIG. 8, the solvent supply unit 11 is arranged near the die 1 on the downstream side. In this example, the solvent supply part 11 is brought as close as possible to the die 1 so that the non-coating part 6b is slightly curved and separated from the smoothing blade 5.
Moreover, it is positioned so as to be pressed against the non-coated portion.

In this way, generation of abrasion powder due to rubbing against the smoothing blade 5 on the non-coated portion 6b is prevented. Even if the non-coating portion 6b comes into contact with the smoothing blade 5, the amount of abrasion powder generated is extremely small, and this does not accumulate on the surface of the smoothing blade 5. Further, even if a very small amount of abrasion powder is generated, it is washed and removed by the solvent 14 and is not mixed into the coating layer of the magnetic paint 10 to cause dropout.

The solvent supply section may be arranged on both the upstream and downstream sides of the die. FIG. 9 is a perspective view (FIG. 1, FIG.
It is a perspective view similar to FIG.

In the example of FIG. 9, the solvent supply unit 11 is provided on the upstream side of the die 1 as in the example of FIG. 1, and the solvent supply unit 11 is provided on the downstream side of the die 1 as in the example of FIG. Is also provided.

By doing so, even if the above-mentioned effect due to the solvent coating on the upstream side of the die is insufficient, the above-mentioned effect due to the bending of the non-coated portion 6b and the solvent coating on the downstream side of the die. Is added, and the effect of preventing wear debris generation becomes more reliable.

The solvent supply section may have a structure other than the solvent supply section 11 shown in FIGS. 2 and 4. Figure 10-Figure
14 shows a solvent supply unit according to another example.

10 and 11 show the solvent supply section, FIG. 10 is a perspective view, and FIG. 11 is a sectional view taken along line XI-XI of FIG. Solvent supply section
Reference numeral 31 is a semi-cylindrical body 31a with a lid, and a base film 6A
A slit 31b is provided on the contact surface with and the inside is filled with the sponge 30. The solvent 14 supplied from the pump 13 passes through the pipe 12 and the sponge 30 in the solvent supply unit 31.
And is applied to the area 6c which is the non-application portion of the base film 6A through the slit 31.

The solvent supply section shown in FIGS. 12 to 14 is of a cylindrical shape so as to supply the solvent to the areas which are the non-coated sections on both side edges of the base film. Figure 12 is a perspective view of the solvent application section.
13 is the same sectional view (sectional view taken along the line XIII-XIII in FIG. 14), and FIG. 14 is a diagram
13 is a sectional view taken along line XIV-XIV of FIG.

The solvent supply unit 41 is composed of a cylindrical body 41a with a lid, slits 41b and 41b are provided corresponding to the regions 6c and 6c which are non-coated portions of the base film, and a sponge 40 is filled inside. Solvent 14 supplied from pump 13
Penetrates into the sponge 40 in the solvent supply unit 41 via the pipe 12 and passes through the slits 41b and 41b.
It is applied to the areas 6c and 6c which are non-application portions of A.

The solvent supply parts 31, 41 are the same as in the above-mentioned example.
It goes without saying that they may be arranged on both the downstream side and the upstream side of the die 1.

In all of the above examples, the solvent is applied to the non-coated portion or the non-coated portion of the base film, but liquid lubricant or water is supplied in place of the solvent to generate abrasion powder. The effect of prevention can be produced. In particular, the supply of the lubricant is effective in reducing friction and preventing generation of abrasion powder when both side edges (areas to be non-coated portions) of the base film should contact the smoothing blade. Even if water is supplied, the same effect can be obtained.

As the lubricant, silicone oil can be preferably used, but in addition, a suspension of stearic acid ester mixed in the magnetic paint is preferable. Because,
Even if the stearic acid ester penetrates into the magnetic paint coating layer, it does not cause any trouble because it is originally the same kind as the lubricant in the magnetic paint. For the same reason, the suspension of BaTiO ₃ which is an abrasive in the magnetic paint can be used instead of the lubricant suspension. However,
It goes without saying that other liquid lubricants can be used.

In each figure, the reference numeral of the lubricant is 24 and the reference numeral of water is 34, and the parentheses are attached.

The liquid supplied to the non-coated portion of the base film or the region to be the non-coated portion may be a solvent, a lubricant, water, or a pressurized fluid. As the pressurized fluid,
It is convenient to use pressurized air, but it is preferable to use another fluid, especially pressurized gas such as nitrogen.

FIG. 15 is a perspective view (a perspective view similar to FIG. 1) in which pressurized air is blown to a region which is a non-coated portion of the base film, FIG. 16 is an enlarged perspective view of the periphery of the die, and FIG. It is an enlarged plan view.

On the upstream side of the die 1, air injection nozzles 51, 51
Areas 6c, 6c which are non-coated portions of the base film 6A
Are arranged towards. Each air injection nozzle 51 is connected to a pressure vessel 55 via a pipe 52 and a pressure control valve 56. The high-pressure air compressed by the compressor 53 is the pressure vessel 55.
Stored in.

The pressurized air 54 held at a predetermined pressure by the pressure control valve 56 is blown out from the nozzles 51, 51 and blown onto the areas 6c, 6c which are non-coated portions of the base film 6A. The areas 6c and 6c are bent by blowing the pressurized air 54 as shown in FIG. 17, and this bending is maintained up to the position facing the die 1, and the magnetic coating material 10 is applied to the application portion 6a. Therefore, the non-coated portions 6b and 6b do not come into contact with the die 1 (especially the smoothing blade), and no abrasion powder is generated here.

The air injection nozzles 51, 51 can be provided on the downstream side of the die 1 as shown in FIG. 18, and can be provided on both the upstream and downstream sides of the die 1 as shown in FIG. Also in these examples, the effect of preventing the generation of wear debris can be achieved, as in the examples of FIGS. 15 to 17. This is the example of FIG. 8 and FIG.
The same as in the example.

FIG. 20 is a perspective view (a perspective view similar to FIG. 1) showing an example in which a solvent supply section (or an air injection nozzle) is provided on the upstream side of the die, and a guide roller on the upstream side is devised. is there. A straight guide roller 8 is used as the downstream guide roller.

FIG. 21 is a plan view of the guide roller 18.
The guide roller 18 is formed so that the diameter d of both axial end portions 18b is smaller than the diameter D of the guide roller coating portion 18a that supports and guides the coating width of the base film 6.

That is, the taper is provided from the coating portion 18a toward both ends. If the distance that reduces the diameter from the coating portion 18a to both ends 18b is represented by L, the slope (taper ratio or inclination ratio) of the tapered surface formed by the both ends 8b of the guide roller is D−d /
2L, that is, H / L, and the slope of this tapered surface is 1
/ 20 or more is preferable.

When the uncoated base film 6A is guided by the guide roller 18 on the upstream side, the guide roller 18 has its both axial end portions 18b smaller in diameter than the coating portion 18a due to the taper. Since the base film 6A guided to the die 1 has its both end portions 6c deformed following the taper and the contact with the die 1 is relaxed, the surface of the front blade 4 is formed. And smoothing
It comes to run along the surface of the blade 5.

As a result, even if the application of the solvent 14 to the region 6c by the solvent supply unit 11 is insufficient, for example, abrasion of the die 1 can be prevented and the generation of abrasion powder can be prevented. In order to ensure this effect, the distance between the slit 3 of the die 1 and the center axis of the guide roller 18 should not be too large, and is preferably 200 mm or less.

Contrary to the above, as shown in FIG. 22, a tapered guide roller 18 can be provided on the downstream side of the die 1, and a straight guide roller 8 can be used on the upstream side. In this example, since the guide roller on the upstream side of the die is the straight guide roller 8 without taper, the deformation of the base film 6 at the position facing the die 1 does not depend on the guide roller 8 on the upstream side, From the downstream guide roller 18.

By disposing the tapered guide roller 18 on the downstream side of the die in this way, the coated base film 6B is deformed in the same manner as in the example of FIG. 20, and this deformation is opposed to the die 1 on the upstream side. It is possible to extend to the position where it does, and it is possible to obtain the same effect as in the example of FIG. The deformation of the base film 6B is released further downstream of the guide roller 18 on the downstream side. Even in this example, by setting the distance between the slit 3 of the die 1 and the central axis of the guide roller 18 to be 200 mm or less,
The same effect as in the example of FIG. 20 can be obtained.

FIG. 23 is a perspective view showing an example in which the tapered guide roller 18 is used on both the upstream and downstream sides of the die 1 (see FIG. 2).
0 is a perspective view similar to FIG. 22). In this way, Figure 2
0, the effect in the example of FIG. 22 can be made more reliable.

In the examples of FIGS. 20, 22, and 23, the solvent supply unit 11, the lubricant supply unit 41, or the air injection nozzle 51 is replaced by
It goes without saying that they may be arranged on both the upstream side, the downstream side and the upstream / downstream side of the die 1.

24 to 26 show an example in which the spacer of the die is provided with a lubricant supply function. FIG. 24 is a perspective view of the die and its periphery, FIG. 25 is an enlarged perspective view of the spacer, and FIG. It is an enlarged side view of the periphery.

The die 61 is provided with a spacer 67 provided with a lubricant supply passage 67a, and the lubricant 64 is supplied to the lubricant supply passage 67a by the pump 13. Other than that, there is no difference from the die 1 of FIG. The lubricant supply path 67a has a narrow width at the portion in contact with the tip base film 6 (same width as the area 6c).
It is a cut-off part with a shape that becomes wider toward the front.
It is formed as a gap between the front blade 4 and the smoothing blade 5 indicated by a phantom line at 25.

As the lubricant 64, silicone oil or a suspension of stearic acid ester is suitable for the above-mentioned reason, and the lubricant is supplied through the pipe 12 by the pump 13 to the lubricant supply passage.
67a. The lubricant 64 that has come out of the tip end opening of the lubricant supply path 67a is applied to the region 6c that is the non-application part of the base film 6, and the non-application part 6b is applied to the smoothing blade 5 as in the above-mentioned examples. There is no contact. Even if this contact occurs, the supply of the lubricant reduces the friction and prevents the generation of abrasion powder due to the friction.

Moreover, the lubricant 64 need only be supplied to the lubricant supply passage 67a, and it is not necessary to supply it as a pressurized lubricant while maintaining a predetermined pressure. Therefore, it is not necessary to control the pressure for supplying the lubricant, and the lubricant supply mechanism can be simple.

In each of the above examples, the die 61 shown in FIGS. 24 to 26 can be used instead of the die 1. Figure 1,
In FIG. 6, FIG. 8, FIG. 9, FIG. 15, FIG. 18, FIG. 19, FIG. 20, FIG. 22 and FIG. 23, the reference numeral “61” of the die of FIG. is there. The same applies to the die 71 of FIG. 27 described next.

In the die 71 of FIG. 27, the lubricant supply passage 77a of the spacer 77 has a simple constant width (same width as the non-application portion 6b). And here stearic acid ester 74
Of the stearic acid ester 64 by stuffing the powder of No. 1 or by inserting (compacting powder) obtained by compressing and molding this powder and gently pressing it with a pressing member 75 having a pressing means 76 such as a spring. It is supplied to the non-coating portion 6b of the film 6.
Other than that, there is no difference from the die 61 of FIGS.

In this way, the same effect as in the example of FIGS. 24 to 26 is obtained, and the structure of the lubricant supply section is simplified. Further, as described above, since the stearic acid ester 74 as the lubricant to be supplied is of the same kind as the lubricant in the magnetic paint, even if a part thereof is mixed in the layer of the magnetic paint, there is no problem.

In all of the above examples, the magnetic paint is applied to the base film. In addition to this, ink film production in which ink is applied to the base film, and various other paints are applied to the flexible support. The present invention can be applied to the application of the same to obtain the same effect.

The shape of the tapered guide roller may be selected as appropriate so that the contact pressure of the base film with respect to the die can be adjusted as described above.

[0084]

According to the present invention, the fluid is supplied to the uncoated portion of the flexible support on the upstream side and / or the downstream side of the coating material applying means, or the lubricant is applied from the coating material applying means to the uncoated portion. Since the fluid is supplied, it is possible to prevent the non-applied portion from directly contacting the constituent portion of the coating material applying means by the supplied fluid or lubricant.

As a result, generation of abrasion powder due to rubbing of the non-applied portion with respect to the constituent portion of the coating material application means is prevented, and this abrasion powder is mixed into the coating material coating layer and the abrasion powder is accumulated in the non-application portion. Even coating unevenness due to deformation and streak failure do not occur, and formation of a uniform coating layer with no defects is guaranteed. In addition, it is not necessary to remove the accumulated abrasion powder, which enables continuous operation for a long time.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part around an extrusion-type die according to an embodiment.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is an enlarged perspective view of the extrusion-type die.

FIG. 4 is an enlarged front view of a base film in the vicinity of the extrusion-type die.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a schematic front view of an apparatus from the application of the magnetic coating material through the drying to the calendar processing.

FIG. 7 is an enlarged cross-sectional view of the magnetic tape before cutting.

FIG. 8 is a perspective view of a main portion around an extrusion-type die according to another embodiment.

FIG. 9 is a perspective view of a main part around an extrusion-type die according to still another embodiment.

FIG. 10 is an enlarged perspective view of a solvent supply unit according to still another embodiment.

11 is a sectional view taken along line XI-XI of FIG.

FIG. 12 is an enlarged perspective view of a solvent supply unit according to still another embodiment.

FIG. 13 is an enlarged cross-sectional view of the solvent supply section (XIII-XIII in FIG. 14).
It is a line sectional view).

14 is a sectional view taken along line XIV-XIV in FIG. 13.

FIG. 15 is a perspective view of a main part around an extrusion-type die according to still another embodiment.

16 is a partially enlarged view of FIG.

FIG. 17 is an enlarged plan view of the pair of air ejection nozzles.

FIG. 18 is a perspective view of a main part around an extrusion-type die according to still another embodiment.

FIG. 19 is a perspective view of a main part around an extrusion-type die according to still another embodiment.

FIG. 20 is a perspective view of a main part around an extrusion-type die according to still another embodiment.

FIG. 21 is a plan view of the tapered guide roller.

FIG. 22 is a perspective view of a main part around an extrusion-type die according to still another embodiment.

FIG. 23 is a perspective view of an essential part around an extrusion-type die according to still another embodiment.

FIG. 24 is an enlarged perspective view of an extrusion-type die according to still another embodiment.

FIG. 25 is a partially enlarged view of FIG. 24.

FIG. 26 is an enlarged front view of a base film near the extrusion-type die.

FIG. 27 is an enlarged perspective view of an extrusion-type die according to still another embodiment.

FIG. 28 is an enlarged perspective view around the extrusion-type die according to the conventional example.

29 is an enlarged sectional view taken along line XXIX-XXIX in FIG. 28.

FIG. 30 is an enlarged front view of a base film near the extrusion-type die.

FIG. 31 is an enlarged cross-sectional view of the base film deformed by the accumulated abrasion powder.

[Explanation of symbols]

 1, 61, 71 ... Extrusion-type die 3 ... Slit 4 ... Front blade 5 ... Smoothing blade 6 ... Base film 6, 6A, 6B ... Base film 6a. ..Coating part 6b ... Non-coating part 6c ... Area to be non-coating part 7,67,77 ... Spacer 8 ... Guide roller 10 ... Magnetic paint 11,31,41 ... Solvent (lubricant, water) supply unit 14 ・ ・ ・ Solvent 18 ・ ・ ・ Tapered guide roller 24 ・ ・ ・ Lubricant 34 ・ ・ ・ Water 51 ・ ・ ・ Air injection nozzle 54 ・ ・ ・ Pressurized air 64 ・ ・・ Lubricant 67a, 77a ・ ・ ・ Lubricant supply path 74 ・ ・ ・ Stearic acid ester (lubricant)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hisayuki Sugano 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (5)

[Claims] 1. A coating means for coating paint on a relatively traveling flexible support, and a fluid on a non-coated portion of the flexible support upstream and / or downstream of the coating means. And a fluid supply means for supplying the liquid. 2. The coating means according to claim 1,
The coating device according to claim 1, wherein a lubricant supplying unit that supplies a lubricant to a non-coating portion of the flexible support is provided in the coating unit. 3. The coating apparatus according to claim 1, wherein the fluid is a solvent, a lubricant, water or a pressurized fluid. 4. A contact pressure adjusting means for adjusting the contact pressure of the flexible support to the applying means such that the contact pressure of the flexible support is small in the non-applying portion and is large in the applying portion, and the contact pressure adjusting means is provided for the applying means. The coating device according to claim 1, 2 or 3, which is provided on the upstream side and / or the downstream side. 5. Front blade surface and smoothing
The coating means is constituted by an extrusion die for coating the coating while extruding the coating material from the slit on the flexible supporting body which continuously runs along the blade surface, and the coating width side of the flexible supporting body. The coating device according to claim 1, wherein a non-coating portion is formed on the edge.