JPH09141167A - Coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a good thin coating film by high speed coating. SOLUTION: A die 2 is arranged to a running support 1 in a non-contact state and a coating material 6 is applied to the support 1 while extruded from the slit 5 provided to the leading end of the die 2. A magnet part 3 having a magnetic gap 15 is arranged on the side opposite to the die 2 through the support 1 so that the magnetic gap 15 is opposed to the leading end of the die 2 and the respective leading end angles of the upper and lower lips 7, 8 constituting the slit 5 are respectively set to 30-110 deg.. The shift quantities of the leading end parts of both lips 7, 8 may be set to +1.0--1.5mm on the basis of the leading end part position of the upper lip 7 when the protruding direction of the leading end part of the lower lip 8 is set to a positive direction as compared with the leading end part of the upper lip 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called extrusion type coating device, and more particularly to a coating device suitable for coating a magnetic paint or the like when manufacturing a magnetic recording medium.

[0002]

2. Description of the Related Art Generally, as an audio tape or a video tape, a magnetic paint is prepared by dispersing and kneading a magnetic powder, a binder, a dispersant, a lubricant, etc. in an organic solvent on a non-magnetic support such as a polyester film. A so-called coating type magnetic recording medium in which a magnetic layer is formed by coating is used.

In manufacturing this coating type magnetic recording medium, as a device for coating a magnetic coating on a support, a coating device using a roll such as a gravure roll or a reverse roll has been conventionally used. In particular, an apparatus using a direct gravure method capable of coating a wide range of structural viscosities (thixotropic properties) is generally used.

The gravure roll is subjected to surface treatment such as hard chrome treatment in consideration of abrasion resistance. Depending on the structural viscosity of the magnetic paint, the transferability of the paint from the roll to the support is impaired, and output fluctuation due to uneven coating thickness and dropout due to paint scattering are likely to occur. These problems tend to become more pronounced as the coating speed increases.

In particular, when a magnetic paint having a high structural viscosity or a metal-based magnetic paint is transferred onto a support having a thickness of 50 μm or more as in the case of forming a magnetic layer of a floppy disk, the gravure roll cell is used. An air layer is likely to be formed between the groove and the support, and transfer failure is likely to occur.

On the other hand, as a new coating device capable of solving such a problem, an extrusion (die) type coating device has attracted attention and has already been partially put into practical use.

This extrusion type coating apparatus is
The magnetic paint extruded continuously toward the surface of the running support is provided with a die having a wide slit facing the tip end surface, and the vicinity of the tip end is doctor-edged. The doctor edge is applied to the support with a uniform thickness. A coating liquid reservoir is provided on the back side of the slit, and the coating material supplied from both sides of the die is sent into the slit through the coating liquid reservoir.

[0008] Such an extrusion type coating apparatus can easily form a coating film having a uniform film thickness, and since the roll having a large diameter is not used, the apparatus is low in cost and downsized. Is advantageous in that. Further, since the coating material supplied to the die is entirely applied, it is not necessary to circulate the coating material around the die, and thus it has been used in the fields of photographic film, photographic paper and the like.

By the way, in recent years, in the above-mentioned coating type magnetic recording medium, it has been desired to develop a coating technique which can sufficiently cope with high-speed coating for improving productivity and thinning of a magnetic coating film.

Therefore, in the above-mentioned extrusion type coating apparatus, in order to form a thinned magnetic coating film without causing unevenness of the film thickness, for example, Japanese Patent Laid-Open No. Sho 62-62.
As disclosed in Japanese Patent Laid-Open No. 95170, a slit formed at the tip of the die is pressed against the support without supporting the back surface of the traveling support, and 50 is provided on the opposite side of the slit with the support interposed. A method has been proposed in which a permanent magnet having a magnetic force of ˜5000 gauss is arranged and magnetic coating is extruded from the slit to apply the magnetic coating. Also, as started in Japanese Patent Laid-Open No. 4-214229, a method has been proposed in which an electromagnet is used instead of a permanent magnet and the direction of the magnetic flux is defined by the angle formed with the surface of the support.

[0011]

However, even if the above-mentioned method is applied, stable coating is difficult because the movement of the magnetic coating cannot be maintained during high-speed coating, resulting in uneven film thickness. It was dead.

As described above, in the conventional coating apparatus, it is the actual situation that sufficient effects cannot be obtained for high-speed coating and thinning of the coating film.

Therefore, the present invention has been proposed in view of the above-mentioned conventional circumstances, and provides a coating apparatus capable of achieving high-speed coating and thinning of a coating film, thereby obtaining a favorable coating film. With the goal.

[0014]

DISCLOSURE OF THE INVENTION A coating apparatus according to the present invention is proposed to achieve the above-mentioned object, and a die having a paint reservoir to which paint is supplied runs. The paint is applied onto the support while being extruded from a slit provided at the tip of the die in a non-contact manner with respect to the support, and the tips are adjacent to each other to form a magnetic gap. A magnet portion configured is disposed on the side opposite to the die with the support sandwiched so that the magnetic gap faces the tip of the die, and the upper lip and the lower lip constituting the slit are The tip angles are 30 ° to 110 °, respectively.

Further, in the coating apparatus according to the present invention, the die and the magnet portion are arranged in the same manner as described above,
The amount of deviation of the tip portions of the upper lip and the lower lip is +1.0 mm, with the direction in which the tip portion of the lower lip projects more than the tip portion of the upper lip as the positive direction, with the tip position of the upper lip as a reference It may be set to be about -1.5 mm.

Further, both the tip angles of the upper lip and the lower lip and the deviation amounts of both tip portions may be restricted within the above-mentioned ranges.

Usually, in the extrusion type coating apparatus, a wide slit is formed so as to face the front end surface, and a die having a doctor edge in the vicinity of the front end surface is used to form a support that is running. The coating material extruded continuously toward the surface is applied on the support with a doctor edge to a uniform thickness. However, in the present invention, the lower lip does not function as a doctor edge, and the support is allowed to run in contact with the lip.

Further, in the coating apparatus of the present invention, the magnet portion is arranged on the side opposite to the die with the support body sandwiched therebetween. Therefore, when a magnetic paint is used as the paint, or when the lip tip is made of a magnetic material, the movement of the paint supplied to the surface of the support can be maintained by the magnetic flux from the magnet. In particular, when the magnet portions are configured such that their tips are adjacent to each other to form a magnetic gap, the magnetic flux in the magnetic gap can be concentrated. As long as the magnet portion has a magnetic gap formed by adjoining the ends thereof, even if the magnet portion is made entirely of a permanent magnet, the permanent magnet is sandwiched between the yokes made of a high magnetic permeability material. It may be. As the permanent magnet, any conventionally known one represented by alnico magnet, rare earth magnet, ferrite magnet and the like can be used. An electromagnet may be used instead of the permanent magnet.

In order to properly concentrate the magnetic flux, the gap between the tip of the magnet and the tip of the die should be 0.2 to 3 m.
It is suitable as m. Further, it is preferable to set the arrangement position of the magnet portion with respect to the die such that the upper end surface of the magnetic gap is located within a range of ± 1 mm with respect to the height of the upper end surface of the slit in the die. Further, the magnetic force in the vicinity of the die tip, that is, the magnetic force in the vicinity of both lips may be appropriately selected according to the coating speed and the coating characteristics (viscosity, surface tension, etc.), but if it is too small, the movement of the coating can be retained. On the other hand, if it is too large, surface roughness will occur in the obtained coating film. For this reason, it is preferable to provide a magnetic force of 500 to 6000 gauss, particularly 3000 to 6000 gauss in the vicinity of both lips.

Further, in the coating apparatus of the present invention, the slit is formed at the tip of the die so that the movement of the coating material from being extruded from the slit to being supplied to the surface of the support can be more favorably maintained. Each tip angle of the lip and the lower lip is regulated.

Here, the "tip angle" of the upper lip indicates an angle formed by the upper end surface of the slit and the tip surface of the upper lip, and the "tip angle" of the lower lip means the lower end surface of the slit and the lower lip. Indicates the angle formed by the tip surface of the. When the front end surface of each lip is a curved surface, the angle is defined by the tangent line at the point where the curved surface intersects the upper end surface or the lower end surface of the slit and the upper end surface or the lower end surface of the slit. However, in the coating apparatus according to the present invention, as long as the relative arrangement of the die and the magnet portion with respect to the traveling support is ensured, the traveling direction of the support and the arrangement direction of the die and the magnet portion can be set arbitrarily. Therefore, in the present specification,
The terms "upper" and "lower" do not necessarily indicate the upper side and the lower side in the vertical direction, but indicate the upstream side and the downstream side in the traveling direction of the support. Therefore, the terms “upper lip” and “lower lip” do not necessarily mean that the upper lip is vertically above the lower lip, but the terms “upper end surface” and “lower end surface”. Is also the same.

This tip angle is 30 ° to 110 °, respectively.
If the angle is regulated to °, it is possible to maintain good movement of the paint, but if the tip angle of one of the lips exceeds 110 °, the paint will be pushed out of the slit and then onto the surface of the support. By the time it is supplied, the coating material spreads, and the streaks strongly appear in the formed coating film. When the tip angle is less than 30 °, there is no problem with the coating characteristics, but if the lip is processed to such an angle, it becomes difficult to handle and it is not practical.

In order to keep the movement of the paint good, it is also effective to define the amount of deviation between the tips of both lips.

With the position of the tip of the upper lip as a reference, the direction in which the tip of the lower lip projects more than the tip of the upper lip is defined as the plus direction, and the amount of deviation between the tips of both lips is +.
If the thickness is regulated to 1.0 mm to -1.5 mm, the movement of the paint can be satisfactorily maintained. However, if the thickness exceeds this range, the streaks strongly appear in the formed coating film.

By the way, the above-mentioned coating apparatus is suitable for being applied to the production of a coating type magnetic recording medium. In this case, the support is used as a support in an ordinary magnetic recording medium. Any of the above can be used, and as the magnetic powder, resin binder, etc. constituting the magnetic paint, any conventionally known one can be used.

For example, as the above-mentioned support, polyesters such as polyethylene terephthalate, polyolefins such as polyethylene and polypropylene, cellulose derivatives such as cellulose triacetate, cellulose diacetate and cellulose butyrate, polyvinyl chloride, polychlorine, etc. Polymer substrates formed of vinyl resins such as vinylidene, plastics typified by polycarbonates, polyimides, polyamideimides, metal substrates composed of Al alloys and titanium alloys, ceramics substrates composed of alumina glass, etc., Examples include glass substrates. The shape is not limited at all, and may be any shape such as a tape shape, a sheet shape, and a drum shape. When a rigid substrate such as an Al alloy plate or a glass plate is used, an oxide film such as an alumite treatment or a Ni-P film may be formed on the surface of the substrate to harden the surface. However, a tape-shaped or sheet-shaped flexible support is preferable in consideration of continuous running of the support.

On the other hand, as the magnetic powder constituting the magnetic paint, a ferromagnetic metal material such as Fe, Co or Ni, or Fe-C is used.
o, Fe-Ni, Fe-Co-Ni, Co-Ni, Fe
-Mn-Zn, Fe-Ni-Zn, Fe-Co-Ni-
Cr, Fe-Co-Ni-P, Fe-Co-B, Fe-
Fe, Co, Ni such as Co-Cr-B and Fe-Co-V
Various ferromagnetic alloy materials containing Mn as a main component, Mn-Bi, Mn
Ferromagnetic metal particles made of an alloy material such as -Al are suitable. Also, for the purpose of improving various characteristics, Al, Si, T
Elements such as i, Cr, Mn, Cu, Zn, Mg, and P may be added. In addition, γ-Fe ₂ O ₃ and Co-containing γ-F
e ₂ O ₃ , Fe ₃ O ₄ , Co-containing γ-Fe ₃ O ₄ , Co
It may be a conventionally known oxide magnetic powder such as γ-Fe ₃ O ₄ , CrO ₂ or the like.

As the binder, a polymer of vinyl chloride, vinyl acetate, vinyl alcohol, vinylidene chloride, acrylic acid ester, methacrylic acid ester, styrene, butadiene, acrylonitrile, or the like, or a copolymer combining two or more of these, Polyurethane resin, polyester resin, epoxy resin and the like are exemplified. In particular, vinyl-based copolymers, polyester-polyurethane-based copolymers, polycarbonate-polyurethane-based copolymers, nitrocellulose and the like are suitable.

As the solvent for dispersing the binder and the magnetic powder, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone and other ketones, methyl acetate, ethyl acetate, butyl acetate, ethyl lactate, glycol acetate mono are used. Esters such as ethyl ether, glycol ethers such as glycol dimethyl ether, glycol monoethyl ether and dioxane, aromatic hydrocarbons such as benzene, toluene and xylene, aliphatic hydrocarbons such as hexane and heptane, methylene chloride, ethylene chloride, Carbon tetrachloride, chloroform,
Chlorinated hydrocarbons such as ethylene chlorohydrin and dichlorobenzene are exemplified.

Further, a dispersant, a lubricant, an abrasive, an antistatic agent, a rust preventive and the like may be added as additives to the magnetic paint.

In addition to the magnetic layer, a back coat layer, a top coat layer or the like may be formed on the support described above, if necessary. In this case, the film forming conditions for the back coat layer, the top coat layer and the like are not particularly limited as long as they are the methods usually applied to the manufacturing method of this type of magnetic recording medium.

The coating apparatus of the present invention can be used not only for coating a magnetic coating material but also for coating a backcoat layer or a topcoat layer in the manufacturing process of such a coating type magnetic recording medium. It is possible.

The coating apparatus of the present invention can also be applied to the field of manufacturing photographic film, photographic paper, and the like.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described below with reference to the drawings.

First Embodiment A coating apparatus according to this embodiment has a structure as shown in FIGS. 1 and 2.

This coating apparatus has a substantially non-magnetic and flexible support 1 having a predetermined width at a midway portion where the non-magnetic and flexible support 1 sequentially runs in the direction A in the drawing from the unwinding side to the winding side. A die (extruder) 2 made of a rectangular parallelepiped metal block is provided, and a magnet portion 3 having a predetermined width is provided on the opposite side of the die 2 with the support 1 interposed therebetween.

The die 2 is disposed on the side of the support 1 which runs in the direction A in the figure, and the lip 4 attached to the tip of the die 2 has a predetermined distance from the surface of the support 1. It is arranged.

A slit 5 is formed on the lip 4 so as to face the tip end surface thereof and have a width corresponding to the coating width.
The slit 5 is a gap through which the paint 6 containing a magnetic material is extruded, and is usually 0.01 to 2.0 mm.
It is considered to be a very narrow gap.

On the back side of the slit 5, a pocket (coating liquid reservoir) 9 communicating with the slit 5 is formed. The pocket 9 has a length substantially equal to the width of the slit 5 and is formed as an orifice-shaped space.

A coating liquid supply port (not shown) is provided at both ends of the pocket 9 so as to open on both end faces of the die 2. The coating liquid for introducing the coating liquid 6 into these coating liquid supply ports. The supply pipe is connected. Further, a pump 10 is attached to an intermediate portion of the coating liquid supply pipe, and the pump 10 is configured to pump the paint 6 from the coating liquid supply pipe into the pocket 9 at a predetermined pressure. .
Therefore, the pocket 9 becomes a space for receiving the paint 6 to be pumped, and has a function of an accumulator. Then, the paint 6 pumped into the pocket 9 is
It is supplied into the slit 5 and is further extruded from the front end portion of the slit 5 to the surface of the supporting body 1 running.

In the coating apparatus according to the present embodiment, the upper lip 7 and the lower lip 8 which form the slit 5 described above.
Is made of non-magnetic material, and its tip angle is 3
It is set to 0 ° to 110 °. The tip angle of the upper lip 7 is an angle formed by the upper end surface of the slit 5 and the tip surface of the upper lip 7, and is indicated by θ ₁ in FIG. Further, the tip angle of the lower lip is an angle formed by the lower end surface of the slit 5 and the tip surface of the lower lip 8, as shown in FIG.
The inside is indicated by θ ₂ .

In this coating apparatus, the lip 4
Since it does not contact the support body 1, the vicinity of the tip of the upper lip 7 does not function as a front blade, and the vicinity of the tip of the lower lip 8 does not function as a smoothing blade. Since the tip angle is regulated as described above, the movement of the paint 6 extruded from the slit 5 can be well maintained.

On the other hand, the paint 6 is applied by the die 2 as described above.
The support 1 to which is applied is supported by guide rolls (not shown), and an appropriate tension is applied by these guide rolls so that smooth traveling is performed. The guide roll is movable in the horizontal direction so that the distance between the support 1 and the tip of the lip 4 can be adjusted.

In the magnet portion 3 provided on the opposite side of the support body 1 with a predetermined distance from the die 2, the permanent magnet 11 has an N pole on the upper side and an S pole on the lower side. It is sandwiched between yokes 12 made of magnetic material. The upper side of the yoke 12 (the upper yoke 13) and the yoke 1
One end of each of the lower sides (lower yokes 14) of the two 2 projects from the permanent magnet 11, and the thickness thereof is reduced toward the tip. The lower yoke 14 is bent so that its tip is adjacent to the tip of the upper yoke 13.

Therefore, in this magnet portion 3, a magnetic gap 15 is formed between the tip of the upper yoke 13 and the tip of the lower yoke 14, and a magnetic flux is generated toward the paint 6 containing a magnetic material. You can

Although not shown, the above-mentioned magnet portion 3 is fixed to a support base that allows the magnet portion 3 to move horizontally and vertically, and the slit 5 and the gap between the tip of the yoke 12 and the tip of the lip 4 are provided. The height position of the magnetic gap 15 with respect to is adjustable.

With the above-described structure, in this coating apparatus, the support 1 traveling in the direction A in the drawing is used.
When the paint 6 extruded from the slit 5 formed facing the tip surface of the lip 4 of the die 2 is attached to the surface of the, the tip angles of the upper lip 7 and the lower lip 8 are optimized. The movement of the coating material 6 is held, and the movement of the coating material 6 is held by the magnetic flux from the magnetic gap 15 in the magnet portion 3, so that good coating is performed.

Further, in this coating apparatus, the lip 4
Since the tip does not come into contact with the support 1, the surface of the support 1 is not scratched or scraped, and chipping streaks due to dust, foreign matter, scraped powder of the support, etc. are unlikely to occur in the formed coating film.

In this embodiment, the case where the tip surfaces of the lips 7 and 8 are flat is shown.
The tip surfaces of the lips 7 and 8 may be curved surfaces. In this case, the tangent line at the point where the curved surfaces intersect the upper end surface or the lower end surface of the slit 5 and the upper end surface or the lower end surface of the slit are formed. The angle is the tip angle, and each is 3
The angle is 0 ° to 110 °.

Second Embodiment In the coating apparatus according to the present embodiment, the tip angles of the upper lip 7 and the lower lip 8 are not specified, but the tip portions of the upper lip 7 and the tip portion of the lower lip 8 are used. The amount of deviation from is specified.

Specifically, as shown in FIG. 3, the tip position of the upper lip 7 is taken as a reference (0), and the tip portion of the lower lip 8 projects more than the tip portion of the upper lip 7. The positive (+) direction is the direction, and the direction in which the tip of the lower lip 8 retracts more than the tip of the upper lip 7 is the negative (-) direction. The deviation amount L is +1.0 mm to −1.5 mm.

The rest of the configuration is the same as that of the coating apparatus shown in the first embodiment, and therefore the same members as those used in FIGS. 1 and 2 are used. However, the description is omitted.

[0053]

EXAMPLES In order to investigate the coating performance of the coating apparatus shown in the above-described first and second embodiments, a non-magnetic and flexible support 1 was actually used. Magnetic paint was applied to.

Example 1 Here, in order to investigate the coating performance of the coating apparatus shown in the first embodiment, the tip angles of the upper lip 7 and the lower lip 8 were set in the range of 30 ° to 120 °. The magnetic coating material was applied under different conditions.

Specifically, the coating device as shown in FIGS. 1 and 2 is set as follows, and the width is 125 mm and the thickness is 13 μm.
m of polyethylene terephthalate film is run, and a magnetic coating for forming a magnetic layer of a magnetic tape for a video tape recorder (VTR) is added in an amount of 2 to 3 μm.
It was applied to a thickness of m.

Settings in Coating Device <Die> Full Width: 160 mm Coating Width: 110 mm Lip 4: Cemented Carbide (Nonmagnetic Material) Upper Lip 7 Thickness 3 mm, Lower Lip 8 Thickness 3 mm Both Lips 7, 8 Tip Amount of deviation of part-0.5 mm Gap of slit 5: 0.3 mm <Magnet part> Width: 150 mm Permanent magnet 11: Neodium alloy magnet Generates a magnetic force of 4000 gauss in the vicinity of lip 4 Yoke 12: S10C (high magnetic permeability material) <Supporting body traveling system> Tension: 2 to 4 kgf over the entire width of the supporting body Running speed: 400 to 1000 m / min The tip angles of the upper lip 7 and the lower lip 8 are 30.
It was changed in the range of ° to 120 °. Further, the traveling speed of the support 1 was also adjusted so that good coating could be performed under the conditions.

When the magnetic coating material was coated in this manner and the maximum coating speed at which good coating was possible was examined, the results shown in Table 1 were obtained.

[0058]

[Table 1]

Table 1 also shows the observation results of the surface of the coating film formed by this coating apparatus. Here, a good level without chipping streaks, etc., a weak chipping streak, but an acceptable level is Δ, the chipping streak appears strongly, and there is a problem in using the coating film as a magnetic layer as x. evaluated.

From Table 1, in the coating apparatus in which the tip angles of the upper lip 7 and the lower lip 8 are 30 °, 60 ° and 90 °, respectively, the magnetic coating is 1000 m / min in a good coating state. It can be seen that it can be applied at high speed. On the other hand, the coating device in which the tip angles of the upper lip 7 and the lower lip 8 are 120 ° (actually, only the tip angle of the lower lip 8 is 120 °, and the tip angle of the upper lip 7 is 80 °. In the above), 600
Good coating is impossible even at a coating speed of m / min.

In this case, the displacement amount of the tip portions of both lips 7 and 8 is set to -0.5 mm, but when the displacement amount is in the range of +1.0 mm to -1.5 mm, all of them are set. The result is similar to that described above.

From this, as shown in the first embodiment, the tip angles of the upper lip 7 and the lower lip 8 are 30 ° to 30 °.
It has been found that by setting the angle to 110 °, the movement of the magnetic paint extruded from the slit 5 can be satisfactorily maintained, and high-speed application can be performed in a good application state.

Example 2 In this example, in order to examine the coating performance of the coating apparatus shown in the first embodiment, the amount of deviation between the tip of the upper lip 7 and the tip of the lower lip 8 was measured. , +1.1 mm to -1.6
The magnetic paint was applied by changing the thickness in the range of mm.

Specifically, in the coating device as shown in FIGS. 1 and 2, the tip angles of the upper lip 7 and the lower lip 8 are set to 90 °, and the tip portions of the upper lip 7 and the lower lip 8 are set. The amount of deviation from the tip is +1.1 mm to -1.6 mm
The magnetic paint was applied in the same manner as in Example 1 except that the amount was changed within the range.

The running speed of the support 1 was also adjusted so that good coating could be performed under the conditions when the deviation amounts of the tips of the lips 7 and 8 were changed. Then, when the maximum coating speed at which good coating can be performed was investigated, the results shown in Table 2 were obtained.

[0066]

[Table 2]

Table 2 also shows the observation results of the surface of the coating film formed by this coating apparatus.

From Table 2, in the coating apparatus in which the deviation amount of the tip portions of both lips 7 and 8 is +1.0 mm to -1.5 mm, no problem occurs even if high speed coating of 1000 m / min is performed. I know there isn't. On the other hand, a coating device in which the tip of the lower lip 8 projects 1.1 mm from the tip of the upper lip 7 and a coating in which the tip of the lower lip 8 retracts 1.6 mm from the tip of the upper lip 7 In the apparatus, good coating is impossible even at a coating speed of 500 m / min.

Although the tip angles of the upper lip 7 and the lower lip 8 are set to 90 ° here, when the tip angles are in the range of 30 ° to 110 °,
The result is similar to that described above.

From this, as shown in the first embodiment, the deviation amount of the tip portions of both lips 7 and 8 is +1.0 mm.
It was found that by restricting to −1.5 mm, the movement of the magnetic paint extruded from the slit 5 can be well maintained, and high-speed coating can be performed in a good coating state.

Although the coating apparatus according to the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made. For example, in the above-described embodiment, an experiment was conducted using a neodymium alloy magnet as the permanent magnet 11 in the magnet unit 3, but any other material may be used as long as it has a desired magnetic force. An electromagnet may be used instead of the permanent magnet 11. In addition, the shape of the yoke 12 in the magnet portion 3 is not necessarily the bottom yoke 1 as long as the tips of the magnet portion 3 are adjacent to each other and a magnetic gap 15 having a desired size can be formed between the tips.
4 may not be bent.

Further, in the die 2 as well, the lip 4 is made of a non-magnetic material, but it may be made of a magnetic material such as S10C, and not only the lip 4 but also the entire die 2 is made of a magnetic material. Good.

1 and 2, the die and the magnet portion are arranged so that the coating material is applied to the support body which runs downward from the vertical direction. If the relative arrangement of the die and the magnet portion with respect to the body is ensured, the traveling direction of the support and the arrangement direction of the die and the magnet portion can be set arbitrarily.

In addition, the kind of the coating material 6 applied to the support 1 and the applied field are not limited.

[0075]

As is apparent from the above description, when the coating apparatus according to the present invention is used, the movement of the coating material supplied onto the support is held by the magnetic flux generated from the magnetic gap of the magnet section. Not only that, but also the movement of the paint can be favorably maintained by optimizing the shape and the amount of deviation of both lips forming the slit. Therefore, even when performing high-speed coating and thin film coating, abnormal coating behavior can be prevented and stable coating can be performed.

Therefore, by applying the present invention, a good coating film can be formed with high productivity.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a configuration example of a coating apparatus according to the present invention.

FIG. 2 is a perspective view of an essential part showing a configuration example of a coating apparatus according to the present invention.

FIG. 3 is an enlarged sectional view of an essential part showing a configuration example of a coating apparatus according to the present invention.

[Explanation of symbols]

 1 Support 2 Die 3 Magnet Part 4 Lip 5 Slit 6 Paint 7 Upper Lip 8 Lower Lip 9 Pocket 11 Permanent Magnet 12 Yoke 13 Upper Yoke 14 Lower Yoke 15 Magnetic Gap

[Procedure amendment]

[Submission date] February 2, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

[0014]

DISCLOSURE OF THE INVENTION A coating apparatus according to the present invention is proposed to achieve the above-mentioned object, and a die having a paint reservoir to which paint is supplied runs. The paint is applied onto the support while being extruded from a slit provided at the tip of the die in a non-contact manner with respect to the support, and the tips are adjacent to each other to form a magnetic gap. A magnet portion configured is disposed on the side opposite to the die with the support sandwiched so that the magnetic gap faces the tip of the die, and the upper lip and the lower lip constituting the slit are The tip end surface is formed of a flat surface or a curved surface, and each tip end angle thereof is set to 30 ° to 110 °.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

Here, the "tip angle" of the upper lip indicates an angle formed by the upper end surface of the slit and the tip surface of the upper lip, and the "tip angle" of the lower lip means the lower end surface of the slit and the lower lip. Indicates the angle formed by the tip surface of the. The front end surface of each lip may be a flat surface or a curved surface. In the case of a curved surface, the tangent at the point where each curved surface intersects the upper end surface or the lower end surface of the slit and the upper end surface of the slit. Alternatively, it is an angle formed by the lower end surface. However, in the coating apparatus according to the present invention, as long as the relative arrangement of the die and the magnet portion with respect to the traveling support is ensured, the traveling direction of the support and the arrangement direction of the die and the magnet portion can be set arbitrarily. Therefore, in this specification, the terms “upper” and “lower” do not necessarily indicate the upper side and the lower side in the vertical direction, but indicate the upstream side and the downstream side in the traveling direction of the support. Therefore, the terms "upper lip" and "lower lip" do not necessarily indicate that the upper lip is vertically above the lower lip, but "upper end surface",
The same applies to the description "lower end surface".

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0041

[Correction method] Change

[Correction contents]

In the coating apparatus according to the present embodiment, the upper lip 7 and the lower lip 8 which form the slit 5 described above.
Is made of non-magnetic material, and its tip angle is 3
It is set to 0 ° to 110 °. The tip angle of the upper lip 7 is an angle formed by the upper end surface of the slit 5 and the tip surface 7a of the upper lip 7, and is indicated by θ ₁ in FIG. The tip angle of the lower lip is the slit 5
Is an angle formed by the lower end surface of the lower lip 8 and the front end surface 8a of the lower lip 8, which is indicated by θ ₂ in FIG.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0049

[Correction method] Change

[Correction contents]

Although the tip surfaces 7a and 8a of the lips 7 and 8 are flat in the present embodiment, the tip surfaces 7a and 8a of the lips 7 and 8 may be curved surfaces. Of course, in this case, the angle formed by the tangent at the point where each curved surface intersects the upper end surface or the lower end surface of the slit 5 and the upper end surface or the lower end surface of the slit is defined as the tip angle, which is 30 ° to 110 °, respectively. And

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Explanation of reference numerals] 1 support 2 die 3 magnet part 4 lip 5 slit 6 paint 7 upper lip 7a tip surface 8 lower lip 8a tip surface 9 pocket 11 permanent magnet 12 yoke 13 upper yoke 14 lower yoke 15 magnetic gap

[Procedure amendment 7]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

Claims (3)

[Claims] 1. A die having a paint reservoir to which the paint is supplied is arranged in non-contact with a traveling support, and the paint is extruded from a slit provided at the tip of the die while the paint is being extruded. In the coating device for coating the above-mentioned support on the support, a magnet portion in which tips are adjacent to each other to form a magnetic gap is provided on the opposite side of the die with the support sandwiched, and the magnetic gap faces the tip of the die. The coating device is characterized in that the tip angles of the upper lip and the lower lip constituting the slit are 30 ° to 110 °, respectively. 2. A die having a paint reservoir to which the paint is supplied is disposed in non-contact with a traveling support, and the paint is extruded from a slit provided at the tip of the die while the paint is being extruded. In the coating device for coating the above-mentioned support on the support, a magnet portion in which tips are adjacent to each other to form a magnetic gap is provided on the opposite side of the die with the support sandwiched, and the magnetic gap faces the tip of the die. The upper lip and the lower lip that form the slit have a displacement amount at each tip end that is lower than the tip end portion of the upper lip with reference to the tip end position of the upper lip. The direction in which the tip of the lip protrudes is defined as the positive direction, and +1.0 mm-
A coating device characterized by having a thickness of 1.5 mm. 3. The coating device according to claim 2, wherein the tip angles of the upper lip and the lower lip are 30 ° to 110 °, respectively.