JP2001321707A - Applicator and method for applying coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an applicator or preventing the lack of coating application when the coating is applied, and a method therefor. SOLUTION: In the applicator in which the coating, e.g. a magnetic coating, on a gravure roll 21 is transferred/applied on a lengthy substrate 23 while the substrate 23 is pressed to the gravure roll 21 by a backup roll 22, a part for packing the coating on the gravure roll 21 is arranged in a shielding space 25, and the pressure of the space 25 is adjusted especially to be at least 0 (Pa).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for applying paint.

[0002]

2. Description of the Related Art In general, in an audio tape or a video tape, a magnetic paint is prepared by dispersing and kneading a ferromagnetic powder, a binder, a lubricant, etc. on a non-magnetic support such as a polyethylene terephthalate film. Is applied to form a magnetic layer. In order to apply the magnetic paint on a non-magnetic support with high stability, from the viewpoint of high productivity, easy operation and management and low production cost,
A so-called gravure coating method is frequently used.

FIG. 6 is a schematic sectional view showing the structure of a gravure coating apparatus. In the following, the case of applying a magnetic paint as an example of the paint will be described, but the present invention can be applied to other paints. As shown in FIG. 6, the coating apparatus includes a gravure roll 1 made of a metal roll or the like having a cell pattern 1p engraved on its surface, and a backup roll 2 for pressing, for example, a long non-magnetic support to the gravure roll. And The gravure roll 1 is configured such that a part of its peripheral surface is immersed in the magnetic paint 4 accommodated in the paint accommodating tank 3 and is rotated so that the cell pattern 1p is filled with the magnetic paint. .

In order to apply the magnetic paint 4 on the non-magnetic support 5 using this coating apparatus, the non-magnetic support 5 is guided by the guide roll 6 between the gravure roll 1 and the backup roll 2. As the transfer proceeds, the non-magnetic support 5 is pressed against the gravure roll 1 by the backup roll 2, and the magnetic paint 4 filled in the cell pattern 1 p is transferred to the gravure roll 1 together with the transfer of the non-magnetic support 5. The coating is continuously transferred onto the non-magnetic support 5 by rotation.

[0005] The setting of the filling amount of the magnetic paint with respect to the cell pattern 1p of the gravure roll 1,
A so-called doctor blade 7 is provided so that the tip is slid in contact with the blade, thereby scraping off more than a required amount of paint filled in the cell pattern 1p and setting the filled amount to a predetermined amount. . The magnetic paint 4 in the paint storage tank 3 is supplied from a paint supply unit 8 that supplies the magnetic paint so that the magnetic paint 4 in the paint storage tank 3 is always maintained at a substantially constant amount. It has been done.

FIG. 7 is a schematic sectional view showing the structure of another coating apparatus using the gravure coating method. 7, parts corresponding to those in FIG. 6 are denoted by the same reference numerals, and redundant description will be omitted. The apparatus shown in FIG. 7 has a configuration in which, instead of the doctor blade, a furnisher roll 9 for rolling contact with a gravure roll 1 at a predetermined pressure is provided. The magnetic paint supplied from the paint supply unit 8 is pressed against the gravure roll 1 by the furnisher roll 9 to supply the magnetic paint to the cell pattern 1p. In this case, the peripheral speed of the furnisher roll 9 is forcibly set to the gravure roll 1
By changing the peripheral speed, the excess paint more than the required amount is scraped off from the cell pattern 1p, and the filling amount is set to a predetermined amount. In this case, a paint removing jig 10 is provided to be slid on the furnisher roll 9, and the paint 4 removed by the removing jig 10 is provided.
Is received by the paint collection tank 12 and collected by, for example, the pump 11.

[0007]

However, in a gravure coating apparatus as shown in FIG. 6, which uses a doctor blade to set a filling amount for a paint cell pattern, the paint scraped off by the doctor blade is used. However, a strong impact on the surface of the paint in the paint storage tank may generate bubbles in the paint in the storage tank. In addition, there is an inconvenience that the spray of the paint due to the rotation of the gravure roll becomes a solidified substance and mixes into the paint in the paint collection tank. This causes problems such as deterioration of the film quality of the transfer-coated film and unevenness of the film thickness.

Further, in the apparatus shown in FIG. 7, paint or the like adhering to both ends of the roll of the furnisher and the shaft is scattered. Along with this, the amount of paint scattered and the amount of splashes increased, and the coagulated material due to this adhered to the gravure roll or the furnisher roll, causing so-called plate clogging,
Even in this case, there is a problem that a transfer failure occurs, and the film quality of the coating film deteriorates and the film thickness becomes non-uniform.
Further, in the coating apparatus using the furnisher roll as described above, since it is difficult to sharply scrape off, the setting of the filling amount of the paint in the cell pattern becomes unstable, and the coating film swells. And other problems arise.

Further, in the doctor blade 7, the outer surface of the gravure roll is pressed against the outer periphery of the gravure roll at an oblique angle, and excess paint in the cell is scraped off by the blade tip of the doctor blade 7. Due to the paint filling pressure or the like, the contact pressure balance is lost, the contact pressure of the doctor blade 7 and the uniformity in the width direction are deteriorated, and poor scraping is caused, and streak-like unevenness is easily generated at the time of transfer. Become. Furthermore, the wear of the blade edge of the doctor blade 7 tends to increase, and the life of the doctor blade is shortened, which may lead to a decrease in the yield of paint transfer.

[0010] In view of the problems of the coating apparatus as described above, Japanese Patent Application No. 11-285748 discloses a paint filling section for filling a gravure roll with a paint and a measuring section in a shielded space having a reservoir configuration. There has been proposed a coating device arranged in the above.

FIG. 8 is a schematic structural view of a coating apparatus proposed in Japanese Patent Application No. 11-285748, and FIG. 9 is a schematic view of a main part thereof.

In the coating apparatus shown in FIG. 8, for example, a gravure roll 121 having a so-called cell pattern 121p formed by fine irregularities, for example, helical fine grooves on the surface, is also provided.
And a backup roll 122 covered with an elastic layer 122e of resin or the like.

[0013] An object 123 to be coated with a paint is guided and transferred by a guide roll 124 between the rolling contact between the gravure roll 121 and the backup roll 122. This object 123
Consists of a non-magnetic support made of, for example, a long resin film, which is unwound from a wound supply roll (not shown), and is interposed between a gravure roll 121 and a backup roll 122 to be transferred. By doing so, a paint, for example, a magnetic paint filled in the cell pattern 121p of the gravure roll 121 is transferred and applied, and is taken up by a take-up roll (not shown).

Then, on a required portion of the gravure roll 121 other than the transfer portion with the backup roll 122, for example, on the side substantially opposite to the transfer portion with the backup roll 122,
A shielding space 125 that covers the gravure roll 121 in the axial direction, for example, over its entire length, and covers the gravure roll 121 over the required rotation angle range of the peripheral surface of the gravure roll 121 and that blocks the scattering of paint, for example, a magnetic paint.

In the shielding space 125, as shown in FIG. 9, a filling portion for filling the cell pattern 121p on the peripheral surface of the gravure roll 121 with a paint such as a magnetic paint is formed. The filling portion of the paint forms a reservoir 126 for the paint as shown in FIG. This storage 126
Is a weir 127 that forms a paint weir substantially at the center of the shielding space 125 in the rotation direction of the gravure roll 121.
Is provided.

A weir forming the paint reservoir 126, in this example, a weir board 127, substantially separates a space region between the near side and the forward side with respect to the rotation direction of the gravure roll 121 which is divided therebetween. Occlude, ie separate.

The surface of the damper 127 on the side facing the gravure roll 121 is an inclined surface that sequentially approaches the gravure roll 121 in the rotation direction indicated by the arrow a of the gravure roll 121, and a weir is formed on the top of the inclined surface. The formation forms a reservoir 126 for the paint.

The distance g between the tips of the weirs forming the storage part 126 of the weir board 127 is, for example, 0.5 mm to 3.0 m.
m can be selected. In addition, the cell pattern 12 of the gravure roll 121 is placed on the front side and the near side of the rotation direction of the gravure roll 121 with the damper 127 interposed therebetween.
A doctor blade 128 for setting the filling amount and a doctor blade 129 for sealing, which constitute a setting unit for setting the filling amount of the paint into 1p, are arranged. Further, side seal walls (not shown) are arranged on both sides of the gravure roll 121 in the axial direction.

Thus, the doctor blade 128
, The doctor blade 129 for sealing, and the side-seal wall form the above-described shielded space 125.

Each of the doctor blade 128 and the sealing doctor blade 129 has a rectangular shape extending substantially along the entire length of the gravure roll 121 and extending along the axial direction of the gravure roll 121.
The contact angle α between the doctor blade 128 and the sealing doctor blade 129 with respect to the gravure roll 121 (that is, the tangent line of the gravure roll 121 at the contact portion between the doctor blade 128 and the sealing doctor blade 129, the doctor blade 128 and the sealing doctor blade 129). The angle formed by the blade 129 and the tip of the blade 129 is slidably contacted at a required angle (for example, 30 ° to 40 °). In addition, it is desirable that the contact angle of the sealing doctor blade 129 with respect to the gravure roll 121 be selected to be equal to the contact angle of the doctor blade 128.

A groove-shaped paint supply passage 132 and a paint discharge passage 133 extending in the axial direction of the gravure roll 121 are formed forward and rearward in the rotation direction of the gravure roll 121 with the damper 127 interposed therebetween. The paint supply path 132 and the paint discharge path 133 are connected to a weir 127
Is inserted into the inner block 13 having a U-shaped cross section, for example.
4 and a pair of outer blocks 135a and 135b arranged at a predetermined interval outside the inner block 134. These inner blocks 134 and both outer blocks 135a are provided.
And 135b, the above-described paint supply path 132 and paint supply path 133 are formed, respectively.

A single or a plurality of pipes are connected to each of the paint supply path 132 and the discharge path 133 to form a paint supply port and a discharge port.

However, even in the coating apparatus shown in FIGS. 8 and 9 as described above, in order to improve the productivity of coating the coating material to be coated (nonmagnetic support), the coating speed is increased. It is essential that, for example,
When the rotation speed of the gravure roll is 350 [m / min] or more, a phenomenon occurs in which the inside of the shielding space 125 becomes a negative pressure.

The pressure in the shielding space 125 is negative, that is, 0.
When it is smaller than [Pa], when filling or measuring the paint,
Outside air is entrapped inside the shielded space, causing poor paint removal, such as insufficient filling of the gravure roll 21 with paint, or a lack of paint on an object to be coated such as a coating type magnetic recording medium. In other words, a missing portion may be generated, the tape running property may deteriorate, and the quality of the product may deteriorate.

In the field of magnetic recording devices, there is an increasing demand for higher density recording in the future, and in order to obtain sufficient magnetic recording characteristics, tape running properties, and storage durability of recorded images, etc. There is a need to improve.

[0026]

According to the present invention, there is provided an apparatus for applying a coating material, wherein a long object to be coated is pressed against a gravure roll by a backup roll while applying the coating material on the gravure roll to an object to be coated, for example, a non-magnetic material. This is a coating device for applying and transferring the paint to the surface of the support, wherein a filling portion of the gravure roll with the paint is disposed in a shielded space, and the pressure in the shielded space is reduced to 0 [Pa]. It is assumed that the apparatus has an adjusting means for performing the above adjustment.

In the method for applying a coating material according to the present invention, the coating material on the gravure roll is applied while the long object to be coated is pressed against the gravure roll by a backup roll.
For example, in a method of applying a paint to be transferred onto a surface of a non-magnetic support, the filling of the gravure roll with the paint is performed in a shielded space, and the pressure in the shielded space is not particularly reduced to a negative pressure. That is, it is assumed that the paint is applied after being adjusted so as to be 0 [Pa] or more.

In the coating apparatus of the present invention, the pressure in the shielding space for filling the gravure roll constituting the coating apparatus with the coating material is not particularly negative, that is, 0 [Pa] or more. In the hermetically sealed paint reservoir type coating device, the coating speed is increased, for example, to 350 [m / mi].
n] or more, even in the case of applying to the coating process of the coating in the case where it is set to be equal to or more than the above, by adjusting so as to avoid a negative pressure in the shielded space, the occurrence of paint coating omission is prevented, and at the time of high-speed coating. , The product yield and productivity can be improved.

According to the coating method of the present invention, the pressure in the shielding space for filling the gravure roll with the coating material is adjusted so as not to be particularly negative, that is, to be 0 [Pa] or more. Therefore, in the case where the paint is applied in a closed paint storage type coating apparatus, even when the coating speed of the paint is increased, for example, 350 [m / min] or more, the inside of the shielding space is not changed. By adjusting so as to avoid negative pressure, the occurrence of paint bleeding is prevented, and the product yield during high-speed application is improved.
In addition, productivity is improved.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION The coating apparatus of the present invention comprises a long object to be coated, for example, a non-magnetic support for producing a magnetic recording medium.
This is a paint coating device that transfers the paint on the gravure roll, for example, magnetic paint, onto the object to be coated while applying pressure to the gravure roll by the backup roll, and the filling portion of the gravure roll with the paint is in the shielding space. And a pressure adjusting means (valve) for adjusting the pressure in the shielded space to a negative pressure, that is, 0 [Pa] or more.

Further, the coating method of the present invention is characterized in that a long object to be coated, for example, a non-magnetic support for producing a magnetic recording medium, is pressed against a gravure roll by a backup roll while the coating on the gravure roll is performed. For example, a method of applying a paint in which a magnetic paint is transferred onto the surface of an object to be coated and is applied. Filling of the gravure roll with the paint is performed in a shielded space, and the pressure in the shielded space is reduced by a negative pressure. In other words, it is assumed that the paint is applied so as not to be reduced to 0 [Pa] or more.

Hereinafter, an example of the coating apparatus and the coating method of the present invention will be described with reference to the drawings.
The apparatus and method of the present invention are not limited to the examples shown below. One embodiment of a paint application device of the present invention will be described with reference to FIGS.

FIG. 1 is a schematic configuration diagram showing the configuration of the coating apparatus of the present invention, FIG. 2 is a schematic sectional view of a main part of the coating apparatus of the present invention, and FIG. 3 is a main section of the coating apparatus of the present invention. FIG.

In the coating apparatus shown in FIG. 1, a gravure roll 21 made of, for example, a metal, for example, a steel roll having a so-called cell pattern 21p formed of, for example, fine irregularities, for example, a helical fine groove on the surface, and a rubber roll or a peripheral roll, for example. Rubber with relatively elastic surface,
A backup roll 22 coated with an elastic layer 22e of resin or the like is provided.

An object 23 to be coated with a paint is guided and transferred by a guide roll 24 between the rolling contact between the gravure roll 21 and the backup roll 22. The object to be coated 23 is made of a non-magnetic support, which is a resin film made of e.g. long polyethylene terephthalate, and is unwound from a supply roll (not shown) around which the gravure roll 21 is wound.
The transfer is performed by being sandwiched between the gravure roll 21 and the backup roll 22.
The paint filled in 1p, for example, a magnetic paint is transferred and applied, and is taken up by a take-up roll (not shown).

The required rotation angle of the peripheral surface of the gravure roll 21 is set on a required portion of the gravure roll 21 other than the portion where the gravure roll 21 contacts the backup roll 22, for example, substantially opposite to the portion where the gravure roll 21 contacts the backup roll 22. A shielding space 2 that covers the gravure roll 21 in the axial direction, for example, over its entire length, and that covers the scattering of paint, for example, magnetic paint.
5 is constituted.

As shown in FIG. 2, the cell pattern 2 on the peripheral surface of the gravure roll 21 is placed in the shielding space 25.
1p constitutes a filling portion of a paint for filling a paint, for example, a magnetic paint. The filling portion of the paint forms a reservoir 26 for the paint 50 as shown in FIGS. 2 and 3. The storage section 26 has a weir board 127 that forms a paint weir at substantially the center of the shielding space 25 in the rotation direction of the gravure roll 21.
Is provided.

A weir forming the storage part 26 of the paint, in this example, a weir board 27, substantially separates the space region between the front and the back in the rotation direction of the gravure roll 21 divided by the weir. Occlude, ie separate.

The surface of the damper 27 on the side facing the gravure roll 21 is an inclined surface that sequentially approaches the gravure roll 21 in the rotation direction indicated by the arrow a of the gravure roll 21.
By forming a weir at the top of this inclined surface, a paint reservoir 26 is formed.

The inclination angle θ of this inclined surface is 60 ° to 85 °.
The width of the weir board, that is, the width W of the point at the point closest to the gravure roll 21 is preferably selected to be 0.5 mm to 3.0 mm.

It is preferable that the distance g between the tips of the weirs forming the storage part 26 of the weir board 27 is selected to be, for example, 0.5 mm to 3.0 mm.

Further, a setting section for setting the filling amount of the paint into the cell pattern 21p of the gravure roll 21 is provided in the space area on the front side and the front side with respect to the rotation direction of the gravure roll 21 separated by the dam board 27. A doctor blade 28 for setting the filling amount and a doctor blade 29 for sealing are arranged. Further, as shown in FIG. 3, side seal walls 30 and 31 are arranged on both sides of the gravure roll 21 in the axial direction.

In this way, the doctor blade 28
, The sealing doctor blade 29, and the side-seal walls 30 and 31 form the above-described shielded space 25. The doctor blade 28 and the sealing doctor blade 29 have, for example, in a SUS system, a thickness of 0.15 mm to 0.2 mm, and a tip of the blade has a thickness of 0.08 mm to 0.09 mm.
The thin portion has a length of 1.3 mm to 1.5 mm.

Each of the doctor blade 28 and the sealing doctor blade 29 extends over almost the entire length of the gravure roll 21, and
The doctor blade 28 and the sealing doctor blade 2 have a rectangular shape extending along the axial direction of the doctor blade 28.
9 with respect to the gravure roll 21 (that is, the angle formed between the tangent of the gravure roll 21 at the contact portion with the doctor blade 28 and the sealing doctor blade 29 and the tip of each doctor blade 28 and the sealing doctor blade 29). ) Are arranged so as to slide at a required angle (for example, 30 ° to 40 °).
It is also desirable that the contact angle of the sealing doctor blade 29 with respect to the gravure roll 21 be selected to be equal to the contact angle of the doctor blade 28.

The doctor blade 28 and the doctor blade 29 for sealing can be made of, for example, steel or resin.

A groove-shaped paint supply path 32 and a paint, which extend in the axial direction of the gravure roll 21, respectively, are provided in the space regions in the front and rear in the rotation direction of the gravure roll 21 divided by the dam board 27. The discharge path 33 is configured. These paint supply path 32 and paint discharge path 33
An inner block 34 having, for example, a U-shaped cross section in which the dam board 27 is fitted, and a pair of outer blocks 35a and 35b arranged outside the outer block at a required interval are provided.
Between the inner block 34 and both outer blocks 35a and 35b, the above-described paint supply path 3 is provided.
2 and the discharge path 33. As shown in FIG. 3, the block 34 and the pair of blocks 35a and 35b on both outer sides are mechanically integrated by being connected by a closing block, for example, a screw.

Further, the support 37 of the dam board 27 penetrates through the closing block 36, and the dam board 27 is attached to the gravure roll 21.
2, that is, the adjustment of the gap G between the gravure roll 21 and the gravure roll 21 shown in FIG. 2 is controlled by the control device 38 of the dam, as shown in FIG. 3.

A single or a plurality of pipes are connected to each of the paint supply path 32 and the discharge path 33 to form a supply port 39 and a discharge port 40 for the paint.

As shown in FIG. 1, at least one or more pipes 55 are connected to the paint discharge port 40 communicating from the paint discharge path 33. Is provided with an openable / closable valve 60. The pipe 55 has, for example, a diameter of 0.5 to 2.0.
[Inch] can be applied.

Then, in the step of applying the coating material to the object 23, for example, the non-magnetic support, the object 23 is run, and the paint is supplied from the supply port 39 and discharged from the discharge port 40. , Open and close the valve 60,
The flow velocity of the paint discharged from the discharge port 40 is adjusted.

The adjustment of the flow rate of the discharged paint will be specifically described with reference to the drawings. FIG. 4 is a schematic perspective view of an example of a main part of the coating apparatus as viewed from the side where the paint supply port 39 and the paint discharge port 40 are arranged. In the example shown in FIG. 4, two paint outlets 40 are provided, and the pipes 55 a and 55 b connected to the respective paint outlets 40 are finally combined into one joint pipe 51.
Has a configuration in which the valve 60 is arranged at an arbitrary position.

The valve 60 provided in the joint pipe 51
Is 100%, that is, the flow rate of the paint when fully opened is V _0, and the opening of the valve 60 is 10
Assuming that the flow velocity of the discharged paint is V ₁ when it is set to a predetermined value of less than 0%, the relational expression of V ₀ > V ₁ holds. Therefore, the discharge is performed by adjusting the opening of the valve 60. The flow rate of the paint can be adjusted to any value.

In the coating apparatus of the present invention, FIG.
Pressure measuring device 7 for measuring the pressure in the shielded space 25 shown in FIG.
By setting this value to 0, the pressure in the shielding space 25 can be appropriately measured while the object 23 is running, that is, during the paint application step, and can be externally confirmed by a monitor. In the present invention, the pressure in the shielding space 25 is set to a negative pressure, that is, 0 [Pa] or more, when the paint is applied to the object 23. Therefore, the pressure in the shielding space 25 is 0 in advance.
[Pa] The flow velocity V ₁ of the paint that is equal to or more than [Pa] is measured, and the opening of the valve 60 at which the flow velocity of the paint is V ₁ is measured. It is made to be adjusted.

As shown in FIG. 3, the side seal walls 30 and 31 have a curved surface 30s and 31s corresponding to the curved surface of the gravure roll 21 as shown in FIG. Side seals 3 made of polyurethane, foamed polyethylene, etc., and made of a resilient body having the required conductivity without causing electrification.
0A and 31A are respectively attached to conductive side seal holders 30B and 31B having conductivity, for example, by screwing. The conductivity of the side seals 30A and 31A is selected, for example, to such an extent that the resistance between the side seals 30A and 31A and the gravure roll 21 becomes 10 ⁸ Ω or less. And these side seal holders 30B and 31B
But the outer blocks 35a and 35b and the closing block 3
6 are liquid-tightly attached to both end surfaces of the base member 6 by screwing or the like.

As described above, in the coating apparatus in which the pressure in the shielding space 25 is set to 0 [Pa] or more in advance by adjusting the opening degree of the valve 60, the paint, for example, the magnetic paint is applied.
The paint is supplied from the supply port 39 to the paint supply path 32. In this way, within the rotation range of the gravure roll 21 between the doctor blade 29 for sealing and the doctor blade 28,
The gap between the gravure roll 21 and the peripheral surface of the gravure roll 21 on which the cell pattern 21p is formed and the weir board 27 are narrowed by the inclined surface of the weir board 27, and the paint is damped. As a result, the paint 50 stays, and the reservoir 26 is formed. In this way, a paint filling section is formed in which the target paint is filled under pressure into the cell pattern on the peripheral surface of the gravure roll 21.

Then, the gravure roll 21 rotates in the direction of arrow a while the paint is adhered to the cell pattern 21p of the gravure roll 21 by the storage portion 26 of the paint 50, that is, the cell pattern 21p is applied. By this rotation, the portion of the gravure roll 21 where the paint is applied reaches the contact portion with the doctor blade 28 which constitutes the paint filling amount setting portion. The surplus paint, that is, the paint adhering to a predetermined amount or more, is scraped off by the tip of the doctor blade 28, and the cell pattern 21p is filled with a predetermined amount of paint.

Thus, the gravure roll 21
The area filled with a predetermined amount of paint is the backup roll 2
The coating material is transferred to the coating target 23, that is, is applied to the non-magnetic support holding portion of the coating target 23 in cooperation with the coating target 2.

In this manner, the coating film formed by applying the coating material to the object 23 is subjected to a smoothing and drying process using a smoother (not shown).
For example, it is possible to manufacture a high-quality coating type magnetic recording medium having no magnetic paint.

Next, as one example, a magnetic layer is formed on a non-magnetic support by the coating method of the present invention using the coating apparatus of the present invention to produce a so-called coating type magnetic recording medium. Examples will be described with reference to Examples and Comparative Examples.

[Example 1] An object 23 (non-magnetic support) made of a polyester film having a thickness of 9.0 [μm].
Above, using the coating apparatus of the present invention described above, the traveling speed was set to 500 [m / min], and a magnetic paint having the following composition was applied.
A calender surface treatment was performed through a smoother treatment and a dryer treatment to form a film with a film thickness of 1.0 ± 0.2 [μm], and thereafter, the film was cut into a width of 8 [mm] to produce a magnetic tape. (Composition of the above magnetic paint) Magnetic powder 100 [parts by weight] Binder resin 20 [parts by weight] Abrasive (Al ₂ O ₃ ) 3 [parts by weight] Conductive agent (carbon powder) 2 [parts by weight] Methyl ethyl ketone 100 [weight] Parts) Toluene 100 [parts by weight] Cyclohexanone 50 [parts by weight] Using the coating apparatus of the present invention, the gap g between the gravure roll 21 and the tip of the weir 27 constituting the storage part 26 of the paint is determined.
1.0 mm. Also, a valve 60 that can be opened and closed to adjust the flow rate of the paint when the paint is discharged from the discharge path 33.
Use a ball valve and set the valve opening to 2
%, And the flow velocity of the paint when it is discharged from the discharge passage 33 is set to 0.1 [m / sec]. Note that the pipe diameter of the paint discharge passage is 1.0 [inch] because there is no substantial difference in the range of 0.5 to 2.0 [inch]. The slope θ of the dam 27 is 60 °, the peak width is 0.5 mm, and the doctor blade 28 for setting the filling amount and the doctor blade 29 for sealing are
Each is made of steel and has a gravure roll 21
Was 30 °.

[Embodiment 2] The opening degree of the valve 60 is set to 5%.
And the flow rate of the paint was 0.2 [m / sec]. Other conditions were the same as in [Example 1] to prepare a magnetic tape.

[Embodiment 3] The opening degree of the valve 60 is set to 10
[%], And the flow rate of the paint was 0.2 [m / sec]. Other conditions were the same as in [Example 1] to prepare a magnetic tape.

[Embodiment 4] The opening degree of the valve 60 is set to 20.
[%], And the flow rate of the paint was 0.25 [m / sec]. Other conditions were the same as in [Example 1] to prepare a magnetic tape.

[Embodiment 5] The opening degree of the valve 60 is set to 30.
[%], And the flow rate of the paint was 0.3 [m / sec]. Other conditions were the same as in [Example 1] to prepare a magnetic tape.

[Embodiment 6] The opening degree of the valve 60 is set to 50.
[%], And the flow rate of the paint was 0.55 [m / sec]. Other conditions were the same as in [Example 1] to prepare a magnetic tape.

[Embodiment 7] The opening degree of the valve 60 is set to 65
[%], And the flow rate of the paint was 0.65 [m / sec]. Other conditions were the same as in [Example 1] to prepare a magnetic tape.

[Comparative Example 1] The opening degree of the valve 60 was set to 1 [%].
And the flow rate of the paint was 0.08 [m / sec]. Other conditions were the same as in [Example 1] to prepare a magnetic tape.

Comparative Example 2 The opening degree of the valve 60 was set to 65
[%], And the flow rate of the coating material was 0.7 [m / sec]. Other conditions were the same as in [Example 1] to prepare a magnetic tape.

Comparative Example 3 The opening degree of the valve 60 was set to 70
[%], And the flow rate of the paint was 0.75 [m / sec]. Other conditions were the same as in [Example 1] to prepare a magnetic tape.

[Comparative Example 4] The opening degree of the valve 60 was set to 80
[%], And the flow rate of the paint was 0.85 [m / sec]. Other conditions were the same as in [Example 1] to prepare a magnetic tape.

[Comparative Example 5] The opening degree of the valve 60 was set to 90
[%], And the flow rate of the paint was 0.85 [m / sec]. Other conditions were the same as in [Example 1] to prepare a magnetic tape.

Comparative Example 6 The opening degree of the valve 60 was set to 100
[%], That is, in a completely open state, and the flow rate of the paint was 0.85 [m / sec]. Other conditions were the same as in [Example 1] to prepare a magnetic tape.

[Comparative Example 7] A coating apparatus having no valve 60 was used, and a plurality of paint discharge paths were not connected to a single pipe. The discharged paint naturally flows directly into the discharged paint receiver. Other material conditions were the same as in [Example 1] to prepare a magnetic tape.

In each of [Example 1] to [Example 7] and [Comparative Example 1] to [Comparative Example 7] described above, the valve opening [%], the paint flow rate [m / sec], and the paint Painted area ratio [%], overall paint condition, shielding space 25
The evaluation results of the internal pressure [Pa] and the appropriate coating speed [m / min] are shown in [Table 1] below.

[0075]

[Table 1]

Here, the coating area ratio [%] in Table 1 means 100% on the non-magnetic support (substrate 23).
In the case where the paint is applied with an area of [m ² ] or more, an arbitrary 10 [m ² ] portion is observed, and the area ratio of the portion where the paint is missing (uneven coating), that is, the paint is applied accurately. The area ratio [%] of the part that is not used.

The comprehensive evaluation of the paint state was made on a non-magnetic support in which a paint film was formed without any paint bleeding (painting area rate of 0%) due to paint filling problems and paint bubbles. Is indicated by a circle, and a pinhole or the like is discontinuously generated, and a coating with a paint penetration rate of less than 10% is marked with a Δ, and the paint penetration rate is high (10% or more). The product which has a bad influence on the quality and the yield of the manufactured product is marked with x. Also, the appropriate coating speed [m / s] in [Table 1] indicates that the coating was accurately performed in each of [Example 1] to [Example 7] and [Comparative Example 1] to [Comparative Example 7]. Shows the limit value of the running speed of the non-magnetic support for performing the coating of the non-magnetic support.

As shown in [Table 1], when the pressure in the shielding space 25 of the coating device was adjusted to 0 [Pa] or more and the coating was performed, the coatings were applied from [Example 1] to [Example 7]. ], The coating application area ratio is extremely low in all cases, the coating state of the coating is extremely good, and the appropriate coating speed is 500
[M / min]. That is, in these, it was found that the coated state was good and a high-quality magnetic tape was obtained.

In [Comparative Example 1], the pressure in the shielding space 25 of the coating apparatus was set to 1.2 [Pa] of 0 [Pa] or more.
However, the flow velocity of the paint in the paint discharge passage is extremely slow, so that the paint is too full in the shielding space 25, the discharge of the paint is delayed, and the paint does not flow smoothly, and the paint leaks from the coating device. Inconveniences such as have occurred.
For this reason, the balance between the supply and the discharge of the paint was poor, the paint was missing, and the application state was unstable in the comprehensive evaluation. The limit value of the appropriate coating speed was 350 [m / min].

In [Comparative Example 2], the pressure in the shielding space 25 of the coating device was -0.08 [P] less than 0 [Pa].
a), and it was confirmed that there was coating loss, and the coating state was unstable in the comprehensive evaluation. The limit value of the appropriate coating speed was 400 [m / min].

In [Comparative Example 3], the pressure in the shielding space 25 of the coating apparatus was -0.1 [P] less than 0 [Pa].
a), and it was confirmed that there was coating loss, and the coating state was unstable in the comprehensive evaluation. The limit value of the appropriate coating speed was 400 [m / min].

In Comparative Example 4, the valve opening was 8
0 [%], and the paint flow velocity in the discharge path is 0.85 [m / s].
ec], the pressure in the shielding space 25 of the coating apparatus is 0
It was -0.1 [Pa] less than [Pa], and the coating application area ratio was as high as 10 [%]. In the comprehensive evaluation, the coating state was unstable, and the proper coating speed was 350
[M / min] was the limit value.

In [Comparative Example 5], the valve opening was 9
0 [%], and the paint flow velocity in the discharge path is 0.85 [m / s].
ec], the pressure in the shielding space 25 of the coating apparatus is 0
It was -0.1 [Pa] less than [Pa], and the coating application area ratio was as high as 12 [%]. In the comprehensive evaluation, the coating state was unstable, and the proper coating speed was 350
[M / min] was the limit value.

In Comparative Example 6, the valve opening was 1
00 [%] (fully open), and the paint flow rate in the discharge path is 0.8
The pressure was as fast as 5 [m / sec], the pressure in the shielding space 25 of the coating device was -0.1 [Pa] less than 0 [Pa], and the paint removal area ratio was as high as 15 [%]. . Also in the comprehensive evaluation, the coating state was unstable, and the proper coating speed was the limit value of 350 [m / min].

In Comparative Example 7, no valve was provided, and the flow velocity of the paint in the discharge passage was 0.85 m / m
sec] and the pressure in the shielding space 25 of the coating device is
The value was -0.1 [Pa] less than 0 [Pa], and the coating application area ratio was as high as 15 [%]. In the comprehensive evaluation, the coating state was unstable, and the proper coating speed was 350
[M / min] was the limit value.

As described in the above [Example 1] to [Example 7] and [Comparative Example 1] to [Comparative Example 7], the pressure in the shielding space 25 of the coating apparatus is negative pressure, that is, 0 [Pa]. ], The smooth flow of the paint in the paint discharge path is hindered, and turbulent layers that are swirled cause the generation of air bubbles such as cavitation in the paint measuring section and the filling section. It was found that dropout occurred.

Therefore, the pressure in the shielding space 25 of the coating device is set to 0 [Pa] or more, and the speed of the paint in the paint discharge path is 0.1 to 0.65 [m / sec], preferably 0.2 to 0.6 [m / sec]. It was found that by selecting about 0.65 [m / sec], it was possible to avoid paint coating omission, to improve the application state, and to improve the appropriate application speed.

Next, in the following [Example 9] to [Example 16] and [Comparative Example 8] to [Comparative Example 11], the coating speed of the paint was previously set to 450 [m / min]. ,
When the opening degree of the valve 60 is changed from 2 [%] to 100 [%], the speed of the paint in the paint discharge path [m / sec]
c), the pressure [Pa] in the shielding space 25 was measured, and the paint application area ratio [%] was evaluated.

The compositions of the paints of Examples 9 to 16 and Comparative Examples 8 to 11 were as shown below, and the paint was applied through the transmission surface. Evaluation is performed using a defect detector (CFS4L manufactured by Sony Corporation).

Polyester polyurethane resin: 300 [parts by weight] (polar group-SO ₃ Na) Carbon: 120 [parts by weight] (trade name: Raven 125 manufactured by Columbia Carbon Co., Ltd.)
5) Titanium oxide: 10 parts by weight (primary particle size: 0.3 μm) Acetone: 50 parts by weight Toluene: 80 parts by weight Methyl ethyl ketone: 90 parts by weight

[Embodiment 9] is a case where the opening degree of the valve is 2 [%], the speed of the paint is 0.1 [m / sec], and the pressure in the shielding space 25 is 1.10 [Pa]. In addition, the area ratio of the paint through is 0%.

[Embodiment 10] is a case in which the opening degree of the valve is 5%, the speed of the paint is 0.2 m / sec, and the pressure in the shielding space 25 is 0.98 Pa. In addition, the area ratio of the paint through is 0%.

[Embodiment 11] is a valve opening of 10%.
In this case, the speed of the paint is 0.2 [m / sec], the pressure in the shielding space 25 is 0.80 [Pa], and the paint-through area ratio is 0 [%].

[Embodiment 12] has a valve opening of 20%.
In this case, the speed of the paint is 0.2 [m / sec], the pressure in the shielding space 25 is 0.65 [Pa], and the paint-through area ratio is 0 [%].

[Embodiment 13] has a valve opening of 30%.
In this case, the speed of the paint is 0.3 [m / sec], the pressure in the shielding space 25 is 0.50 [Pa], and the paint-through area ratio is 0 [%].

[Embodiment 14] has a valve opening of 40 [%].
In this case, the speed of the paint is 0.4 [m / sec], the pressure in the shielding space 25 is 0.35 [Pa], and the paint-through area ratio is 0 [%].

[Embodiment 15] The opening degree of the valve is 50 [%].
And the speed of the paint is 0.55 [m / sec],
The pressure in the shielding space 25 is 0.20 [Pa], and the paint application area ratio is 0 [%].

[Embodiment 16] has a valve opening of 60%.
And the speed of the paint is 0.65 [m / sec],
The pressure in the shielding space 25 is 0.00 [Pa], and the paint-through area ratio is 0 [%].

[Comparative Example 8] is a case where the opening degree of the valve is 70 [%], the speed of the paint is 0.75 [m / sec], and the pressure in the shielding space 25 is -0.1 [Pa]. In this case, the area ratio of the paint-through area was 7%.

[Comparative Example 9] was a case where the valve opening was 80%, the speed of the paint was 0.85 m / sec, and the pressure in the shielding space 25 was -0.1 Pa. In this case, the coating removal area ratio is 9%.

[Comparative Example 10] has a valve opening of 90%.
And the speed of the paint is 0.85 [m / sec],
The pressure in the shielding space 25 is -0.1 [Pa], and the paint application area ratio is 9 [%].

[Comparative Example 11] has a valve opening of 100.
%, The speed of the paint is 0.85 m / sec.
c], the pressure in the shielding space 25 is -0.1 [Pa], and the paint application area ratio is 11.5 [%].

The evaluation results of the above [Example 9] to [Example 16] and [Comparative Examples 8] to [Comparative Example 11] are shown in [Table 2] below, and the pressure [Pa] in the shielding space 25 of the coating apparatus is shown. ]
FIG. 5 shows the relationship between the paint removal area ratio [%]. In FIG. 5, it is assumed that a curve 81 indicates a paint application area ratio [%] and a curve 82 indicates a pressure in the shielding space 25.

[0104]

[Table 2]

As shown in the above [Table 2] and FIG. 5, the flow rate of the paint is set to 0.2 to 0.65 [m / sec], and the pressure in the shielding space 25 is set to 0.00 to 1. 10 [P
In the samples of [Example 9] to [Example 16] referred to as "a", no coating loss of the paint was confirmed, and the coating state was extremely good. On the other hand, in the samples of [Comparative Examples 8] to [Comparative Example 11] in which the pressure in the shielded space 25 was set to a negative pressure, that is, less than 0 [Pa], coating loss was confirmed, and the quality of the tape was practically reduced. It turned out that it was not enough.

In the above-described embodiment of the coating apparatus of the present invention, as shown in FIG. 4, the pipes 55a and 55b connected from the two discharge ports 40 are finally combined into one joint pipe 51. Although the structure in which the valve 60 is installed at a predetermined position of the joint pipe has been described, the coating apparatus of the present invention is not limited to the structure shown in FIG. The present invention can be applied to a coating apparatus having any structure. For example, the number of outlets and the number of pipes are arbitrary, and a valve 60 can be disposed in each of the pipes connected to each of the plurality of outlets to control the flow rate of the paint.

When the coating apparatus of the present invention is applied to the formation of a magnetic layer of a coating type magnetic recording medium, a conventionally known material can be appropriately used as a nonmagnetic support.
For example, polyethylene terephthalate, polyethylene-
Polyester resins such as 2,6-naphthalate, polyolefin resins such as polypropylene, cellulose resins such as cellulose triacetate and cellulose diacetate, vinyl resins, polyimide resins, polycarbonate resins, metals, glass, ceramics, etc. Can also be applied.

As a magnetic material for forming a magnetic layer
A conventionally known material can be appropriately used. example
For example, metals such as Fe, Co and Ni, Fe-Co, Fe-N
i, Fe-Al, Fe-Al-P, Fe-Ni-Si-
Al, Fe-Ni-Si, Al-Mn, Fe-Mn-Z
n, Fe-Ni-Zn, Co-Ni, Co-P, Fe-
Co-Ni, Fe-Co-Ni-Cr, Fe-Co-N
i-P, Fe-Co-B, Fe-Co-Cr-B, Mn
Alloys such as Bi, Mn-Al, Fe-Co-V, oxidation
Iron, iron carbide and the like. These ferromagnetic materials include
For the purpose of preventing sintering at the beginning or maintaining the shape, Al, S
Light metal elements such as i, P, and B may be contained.
As a magnetic material, γ-Fe_TwoO_Three, Fe_ThreeO_Four, Γ-F
e_TwoO_ThreeAnd Fe _ThreeO_FourBelt compound with CrO
_TwoOne or more metal elements such as Te, S
For example, oxides such as b, Fe, and B can be used. Sa
In addition, hexagonal plate-like ferrite can be used to control coercive force.
For various purposes, Co-Ti, Ni-Ti
Etc. may be added.

When forming a magnetic layer of a coating type magnetic recording medium in the coating apparatus of the present invention, the magnetic layer may contain carbon black. As carbon black, furnace for rubber, pyrolytic carbon,
Black for color, acetylene black and the like can be mentioned. These may be used alone or in combination.

As the binder of the magnetic paint, a conventionally known thermoplastic resin can be appropriately used. For example, vinyl chloride, vinyl acetate, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-acrylonitrile copolymer, acrylate-acrylonitrile copolymer, acrylate-vinyl chloride-
Vinylidene chloride copolymer, vinyl chloride-acrylonitrile copolymer, acrylate-vinylidene chloride copolymer, methacrylate-vinylidene chloride copolymer, methacrylate-ethylene copolymer, polyvinyl fluoride, vinylidene chloride- Examples include acrylonitrile copolymer, acrylonitrile-butadiene copolymer, polyamide resin, polyvinyl butyral, cellulose derivative, styrene-butadiene copolymer, polyurethane resin, amino resin, and synthetic rubber.

Further, a conventionally known thermosetting resin can be applied to the binder. For example, phenolic resin,
Epoxy resins, polyurethane-curable resins, urea resins, melamine resins, alkyd resins, silicone resins, polyamine resins, urea-formaldehyde, and the like.

A lubricant layer may be formed on the magnetic layer or as the back coat layer. Examples of the lubricant include graphite,
Solid lubricants such as molybdenum disulfide, silicon oil,
Examples thereof include a resin acid having 10 to 22 carbon atoms, a resin acid ester synthesized from a resin acid having 10 to 22 carbon atoms and an alcohol having 2 to 26 carbon atoms, terpene compounds, and oligomers thereof.

As the non-magnetic reinforcing particles contained in the magnetic layer, aluminum oxide (α, β, γ), chromium oxide,
Diamond, garnet, emery, boric acid nitride, titanium carbide, titanium carbide, titanium oxide (rutile type,
Anatase type) and the like.

As the organic solvent for dispersing the magnetic powder, any of conventionally known materials usually used for forming a magnetic layer can be used. For example, ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; alcohol solvents such as methanol and ethanol propanol; ester solvents such as methyl acetate, butyl acetate, propyl acetate, ethyl lactate, and ethylene glycol acetate; and diethylene glycol dimethyl ether , 2-ethoxyethanol, tetrahydrofuran, ether solvents such as dioxane, aromatic hydrocarbon solvents such as benzene, toluene, xylene, methylene chloride, ethylene chloride, carbon tetrachloride,
Examples thereof include halogenated hydrocarbon solvents such as chloroform and chlorobenzene.

As other additives, dispersants, internal additives,
Conventionally known materials such as an abrasive, an antistatic agent, and a rust preventive can be appropriately used.

In the above-described examples of the coating apparatus and the coating method of the present invention, the case where the magnetic layer is formed by applying the magnetic coating on the non-magnetic support has been described. The coating device and the coating method of the paint are:
The present invention is not limited to the above examples, and any conventionally known materials can be applied as the object to be coated. For the coating applied to this, various conventionally known coatings can be applied. The present invention is not limited to the case where a magnetic paint for forming a magnetic layer is applied.

As described above, in the coating device of the present invention, the pressure in the shielding space for filling the gravure rolls constituting the coating device with the coating material is not particularly reduced to a negative pressure. 0 [Pa] or more, so that the coating speed of the coating material is increased, for example, 350 [m / min] or more in a sealed paint storage type coating device. Also in the case of applying to the coating process of (1), the occurrence of coating loss is prevented, and the product yield and the productivity at the time of high-speed coating can be improved.

According to the coating method of the present invention, the pressure in the shielding space for filling the gravure roll with the coating material is adjusted so as not to be particularly negative, that is, to be 0 [Pa] or more. Therefore, in the case where the paint is applied in a closed paint storage type coating apparatus, even when the coating speed of the paint is increased, for example, 350 [m / min] or more, the inside of the shielding space is not changed. By adjusting so as to avoid negative pressure, the occurrence of paint bleeding is prevented, and the product yield during high-speed application is improved.
And improved productivity.

[0119]

According to the coating apparatus of the present invention, the pressure in the shielding space for filling the gravure rolls constituting the coating apparatus with the coating is not particularly negative, that is, 0 [Pa] or more. In a hermetically sealed paint reservoir type coating apparatus, the coating speed is increased, for example, to 350 [m / mi].
n] or more, even in the case of applying to the coating process of the coating in the case where it is set to be equal to or more than the above, by adjusting so as to avoid a negative pressure in the shielded space, the occurrence of paint coating omission is prevented, and at the time of high-speed coating. , The product yield and productivity can be improved.

According to the coating method of the present invention, the pressure in the shielding space for filling the gravure roll with the coating material is adjusted so as not to be particularly negative, that is, to be 0 [Pa] or more. Therefore, in the case where the paint is applied in a closed paint storage type coating apparatus, even when the coating speed of the paint is increased, for example, 350 [m / min] or more, the inside of the shielding space is not changed. By adjusting so as to avoid negative pressure, the occurrence of paint bleeding is prevented, and the product yield during high-speed application is improved.
In addition, productivity is improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a coating apparatus according to the present invention.

FIG. 2 is a schematic configuration diagram of a main part of a coating apparatus according to the present invention.

FIG. 3 is a schematic perspective view of a main part of the coating apparatus of the present invention.

FIG. 4 is a schematic perspective view of a main part of the coating apparatus of the present invention when viewed from a side where a paint outlet is arranged.

FIG. 5 shows the relationship between the pressure in the shielded space and the area ratio of the paint through.

FIG. 6 is a schematic configuration diagram of an example of a main part of a conventional coating apparatus.

FIG. 7 shows a schematic configuration diagram of another example of a main part of a conventional coating apparatus.

FIG. 8 is a schematic configuration diagram of another example of a conventional coating apparatus.

FIG. 9 is a schematic configuration diagram of another example of a main part of a conventional coating apparatus.

[Explanation of symbols]

1,21,121 Gravure roll, 1p, 21p, 1
21p cell pattern, 2, 22, 122 backup roll, 3 paint storage tank, 4 magnetic paint, 5, 23,
123 Coating object (non-magnetic support), 6, 24, 124
Guide roll, 7 doctor blade, 8 paint supply section, 9 furnisher roll, 10 paint removal jig,
11 pump, 12 paint collection tank, 25, 125 shielding space, 26, 126 storage unit, 27, 127 dam, 2
8,128 doctor blade, 29,129 doctor blade for sealing, 30 side seal wall, 3
0A side seal, 30B side seal holder, 3
0s curved surface, 31 side seal wall, 31A side seal, 31B side seal holder, 30s
Curved surface, 32, 132 paint supply path, 33, 133 paint discharge path, 34, 134 inner block, 35a, 135
a outer block, 35b, 135b outer block,
36 closing block, 37,137 support, 38 dam control device, 39 supply port, 40 discharge port, 50,1
50 paint, 51 joint piping, 55 piping, 55a, 55
b piping, 60 valve, 70 pressure measuring device

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Noboru Numaoka 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Satoru Satoru 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo 6-35 Sony Corporation F term (reference) 4D075 AC25 AC28 AC34 AC53 AC72 AC80 AC84 AC95 BB56Y CA24 CA47 DA04 DB01 DB33 DB36 DB38 DB48 DB53 DC28 EA07 EB07 EB12 EB13 EB14 EB15 EB17 EB19 EB32 EB33 A42 EB38 A040 EB38 A40 EB38 A39 BA26 CB22 CB33 DA03 DA04 DA15 DA17 4F042 AA08 AA22 BA05 BA07 CA01 CC02 DF32 5D112 AA05 AA22 CC09 GA05 KK05

Claims (8)

[Claims] 1. A paint coating apparatus for transferring and coating a coating material on a gravure roll to the coating material while pressing a long object to be coated on the gravure roll with a backup roll. Wherein the filling portion of the paint into the gravure roll is disposed in a shielded space, and the pressure in the shielded space is adjusted to 0 [Pa] or more. apparatus. 2. A method of applying a coating material in which a coating material on a gravure roll is transferred to and coated on the gravure roll while a long object to be coated is pressed against a gravure roll by a backup roll. The filling of the gravure roll with paint is performed in a shielded space, and the pressure in the shielded space is adjusted to 0 [Pa] or more,
A method for applying a paint, which comprises applying the paint. 3. A paint supply passage for supplying paint to the shielded space and a paint discharge passage for discharging paint from the shielded space are provided, and a single or a plurality of pipes are connected to the paint discharge passage. An openable / closable valve is provided in at least one of the pipes connected to the paint discharge path, and the flow rate of the paint discharged from the paint discharge path is controlled by opening and closing the valve. 2. The coating apparatus according to claim 1, wherein the pressure in the shielding space is adjusted. 4. The paint coating apparatus according to claim 3, wherein the flow rate of the paint discharged from the paint discharge path is controlled to 0.1 to 0.65 [m / sec]. 5. A paint filling portion for the gravure roll is formed with a dam which forms a reservoir for the paint, and is divided by a dam which forms a reservoir for the paint.
2. The coating device according to claim 1, wherein each of the front and rear regions in the rotation direction of the gravure roll is shielded from the coating. 3. 6. A filling portion of the gravure roll with paint is formed with a dam which forms a reservoir for the paint, and is divided by a dam which forms the reservoir of the paint.
The doctor blade and the sealing doctor blade arranged with the required contact angle with the gravure roll along the axial direction of the gravure roll are arranged in the region between the front and the front with respect to the rotation direction of the gravure roll, The paint coating device according to claim 1, wherein the shielding space is formed between the doctor blade and the sealing doctor blade. 7. The shielded space defined by the doctor blade, the sealing doctor blade, and side seal walls disposed at both ends of the gravure roll in the axial direction. Paint application equipment. 8. The coating material according to claim 1, wherein the weir plate forming the storage portion of the coating material is formed as an inclined surface sequentially approaching the gravure roll in the rotation direction of the gravure roll. apparatus.