JP2007038093A - Apparatus and method of applying coating material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating apparatus capable of extending the proper range of a coating condition while keeping an applying state of a coating material well. <P>SOLUTION: In the configuration of the coating apparatus for applying the coating material by bringing a rotating gravure roll 3 into contact with a support 1 traveling in one direction by a driving means, the driving means has 2 guide rolls 2 for supporting the support 1 in an almost vertical attitude and travels to vertically move the support 1 by the guide rolls 2 in the almost vertical attitude. The gravure roll 3 is arranged to be in nearly contact with the support 1 supported by 2 guide rolls 2 in the almost vertical attitude to make the winding angle of the support 1 to the gravure roll nearly zero and the outer peripheral part of the gravure roll 3 moves upward to be in the direction opposed to the traveling direction of the support 1 in the contact position of the support 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a coating application apparatus and a coating method, and more particularly to a coating application apparatus and a coating method that are suitable for use in manufacturing a magnetic recording medium, a nonmagnetic medium (back layer, new functional material layer, etc.), and the like. Regarding the method.

  In general, in magnetic recording media, nonmagnetic media (back layers, new functional material layers, etc.), ferromagnetic powder, binders, dispersants, lubricants, etc. are placed on a nonmagnetic support such as polyethylene terephthalate. A magnetic layer is formed by applying a magnetic paint that is dispersed and kneaded in an organic solvent. In addition, in order to increase the adhesive strength when forming a non-magnetic carbon powder medium back layer, and when forming a magnetic or non-magnetic material, a gravure coating method, die coating (slot or The (extraction) method is used extensively.

  In the gravure coating method, a coating material is applied to a support using a gravure roll having a gravure engraving on the outer peripheral surface of the roll. Further, among the gravure coating methods, there is a reverse roll coating method in which the gravure roll is rotated in the opposite direction with respect to the traveling direction of the support. According to this reverse roll coating method, a flat coating film can be obtained without realizing a high-speed productivity and without performing a smoothing process (smoothing process) after coating the paint. The reverse roll coating method is roughly divided into a kiss reverse coating method and a mini kiss reverse coating method. The kiss reverse coating method and the mini kiss reverse method differ only in the diameter of the gravure roll used, and the basic coating principle is the same.

  As a conventional technique related to this type of gravure coating method, for example, a technique described in Patent Document 1 below is known. FIG. 8 is a schematic side view showing a configuration example of a conventional coating apparatus. In the figure, the support 31 is supported by two guide rolls 32. A gravure roll 33 is disposed between the two guide rolls 32. The gravure roll 33 is composed of a metal roll having a cell pattern 33P engraved on its outer peripheral surface, and is supported so as to be rotatable in the direction of the arrow (counterclockwise direction) in the figure. The upper outer peripheral surface of the gravure roll 33 is disposed so as to be in pressure contact with the support 31.

  In addition, a paint supplier 34 is disposed in the vicinity (downward) of the gravure roll 33. The paint supply device 34 includes a paint supply storage device 35, a doctor blade sliding contact device 36, a tray 37, and the like. The paint supply / reservoir 35 is provided with a paint supply / reservoir path 38, and the paint is supplied from the paint supply / reservoir path 38 to the gravure roll 33. The doctor blade sliding contact device 36 performs filling and weighing of the paint into the cell pattern 33P on the outer peripheral surface of the roll by scraping off the surplus part of the paint supplied to the gravure roll 33. The tray 37 collects the paint scraped off by the doctor blade sliding contact device 36.

  In the coating apparatus having the above-described configuration, the support 31 supported by the two guide rolls 32 travels in the direction of the arrow, and the gravure roll 33 is in contact with the lower surface of the traveling support 31. At this time, the paint supplied on the outer peripheral surface (cell pattern) of the gravure roll 33 by the paint supplier 34 is scraped off by the doctor blade sliding contact device 36, and then in a contact position with the support 31. It is applied (transferred) to the lower surface of the support 31.

  By the way, in the said conventional coating device, the gravure roll 33 is pressed against the support body 31 between the two guide rolls 32, and both are made to contact (pressure contact). Therefore, the winding angle of the support 31 with respect to the gravure roll 33 is increased, and accordingly, the contact area between the gravure roll 33 and the support 31 is increased. In such a case, a coating pool (hereinafter referred to as a transfer bead) formed at the contact portion between the gravure roll 33 and the support 31 is formed wide along the traveling direction of the support 31, so that the coating thickness can be accurately measured. It becomes difficult to control well.

  Therefore, a technique described in Patent Document 2 below is known as a technique capable of stably forming a narrow transfer bead at a contact portion between a gravure roll and a support. In this prior art, the support is supported in a substantially vertical posture, and the support is moved so as to move from the bottom to the top. In addition, the gravure roll is arranged so as to be in substantially line contact with the support, and the gravure roll is rotated so that the outer periphery of the roll moves downward in the opposite direction to the running direction of the support at the contact position with the support. ing. According to this prior art, the contact area between the gravure roll and the support is narrowed, and thereby the width of the transfer bead formed at the contact portion between the two is also narrowed, so that the coating thickness can be controlled with high accuracy. It becomes.

Japanese Patent Laid-Open No. 7-21558 JP 2002-177836 A

  However, in the technique described in Patent Document 2, for example, when application conditions such as application speed and paint supply amount are changed (when shaken), good application is possible in terms of application unevenness and coating film uniformity. There was a case where the condition could not be obtained.

  The coating material application device according to the present invention is a coating device that applies a coating material by bringing a rotating gravure roll into contact with a support that travels in one direction by a driving means. The gravure roll has a guide member to be supported and travels so that the support supported in a substantially vertical posture by the guide member moves from top to bottom. The gravure roll has a wrapping angle of the support with respect to the gravure roll being substantially zero. In such a manner that the roll outer peripheral portion is disposed in a substantially line contact state with the support member supported in a substantially vertical posture by the guide member, and the roll outer peripheral portion is in a direction opposite to the traveling direction of the support member at the contact position with the support member. Adopted a configuration to move to.

  In this paint coating apparatus, the support is supported by a guide member in a substantially vertical posture and travels so as to move from top to bottom, and a gravure roll is wound around the support so that the winding angle is substantially zero. By rotating the gravure roll so that the outer periphery of the roll moves upward at the contact position, a narrow transfer bead is formed at the contact portion between the gravure roll and the support, and the transfer bead is gravure. It will be stably held by the air flow accompanying the rotation of the roll.

  The coating method according to the present invention is a coating method in which a rotating gravure roll is brought into contact with a support traveling in one direction to apply the coating, and the support is supported in a substantially vertical posture at a predetermined position. In addition, the gravure roll is rotated so that the outer periphery of the roll moves upward in a direction opposite to the traveling direction of the support at the contact position with the support while rotating so as to move from top to bottom. A method is adopted in which the gravure roll is brought into substantially line contact with the support at a predetermined position so that the winding angle of the support with respect to the gravure roll becomes substantially zero.

  In this coating method, the support is supported so as to move in a substantially vertical posture at a predetermined position and is moved so as to move from top to bottom, and the gravure roll is wound around the support so that the angle is substantially zero. By rotating the gravure roll so that the outer periphery of the roll moves upward at the contact position, a narrow transfer bead is formed at the contact portion between the gravure roll and the support, and the transfer bead It will be stably held by the air flow accompanying the rotation of the gravure roll.

  ADVANTAGE OF THE INVENTION According to this invention, the appropriate range of application conditions can be expanded, maintaining the application state of a coating material favorable.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic side view showing a configuration of a coating material coating apparatus according to an embodiment of the present invention. In FIG. 1, a support 1 serving as a medium to be coated is made of, for example, a long (tape-shaped) resin film, is unwound after unwinding from a unillustrated unwinding machine and traveling on a predetermined path. It is designed to be wound on the machine. Examples of the support 1 include a magnetic tape, and more specifically, a base film of a magnetic recording medium such as a video tape or an audio tape, and a polyethylene terephthalate resin film is generally used because of its required characteristics. .

  The support 1 is supported by two guide rolls 2 in the course of the travel path from the unwinder to the winder. In this support state, the support 1 travels while being guided in the Y direction (downward direction) by the rotational drive of the unwinding machine and the winder and the accompanying rotation of each guide roll 2. ing.

  The two guide rolls 2 are horizontally arranged in a state where they are opposed to each other at an appropriate interval. Among these, the support body 1 is wound around the lower guide roll 2 at an angle of approximately 90 °. The support 1 is in contact with the upper guide roll 2 in a line contact state. As a result, between the two guide rolls 2, the support 1 travels (continuously moves) from top to bottom while being supported in a substantially vertical posture. Further, the posture of the support 1 is changed from a vertical posture to a horizontal posture with the lower guide roll 2 as a boundary.

  In addition to the support form shown in FIG. 1 above, as a support form for supporting the support body 1 in a substantially vertical posture with the two guide rolls 2, for example, as shown in FIGS. 2 (A) and 2 (B), Supporting the support 1 so as to form a substantially U-shaped or S-shaped travel path in the vicinity of the two guide rolls 2 by winding the support 1 around the two guide rolls 2 at an angle of approximately 90 °. It may be. Although not shown, the winding angle of the support 1 with respect to the upper guide roll 2 may be approximately 90 °, and the winding angle of the support 1 with respect to the lower guide roll 2 may be approximately 180 °. .

  A gravure roll 3 is horizontally disposed between the two guide rolls 2 (intermediate portion) in a direction orthogonal to the traveling direction of the support 1. The gravure roll 3 is made of, for example, a metal such as steel, and a cell pattern (for example, a turtle shell type, a lattice type, etc.) 3P having fine irregularities is engraved on the outer peripheral surface thereof. The gravure roll 3 is provided so as to be rotatable in the R direction (clockwise direction) by a rotating means (not shown).

  Further, between the two guide rolls 2, the gravure roll 3 is arranged in a substantially line contact from the horizontal direction (lateral direction) with respect to the support 1 supported in a substantially vertical posture by the two guide rolls 2. ing. More specifically, the outer peripheral surface of the gravure roll 3 is in contact with the surface of the support 1 in a substantially point contact state when viewed from the axial direction of the gravure roll 3. Moreover, the winding angle of the gravure roll 3 with respect to the support body 1 is almost zero.

  The contact state between the two is the moment when the outer peripheral surface of the gravure roll 3 comes into contact with the surface of the support 1 in the process of gradually moving at least one of the support 1 and the gravure roll 3 toward each other, More specifically, it is obtained at the moment when the coating material filled in the cell pattern P3 on the outer peripheral surface of the roll is attracted to the surface of the support 1 by surface tension. Therefore, the gravure roll 3 is not pressed against the support 1 and both are in contact with each other with a very light kiss touch.

  Further, between the two guide rolls 2, the support 1 is supported in a substantially vertical posture and travels downward (Y direction), whereas the outer periphery of the gravure roll 3 faces upward at the contact position with the support 1. That is, it moves in the direction opposite to the traveling direction of the support 1.

  In the vicinity of the gravure roll 3, a coating material supplier 4 is arranged in the vertical direction on the opposite side of the contact position with the support 1. FIG. 3 is a side sectional view showing the configuration of the paint supply device 4, and FIG. 4 is an exploded perspective view thereof. As shown in the figure, the paint supplier 4 has an upper block 5, an intermediate block 6, and a lower block 7. A doctor blade 8 for sealing is attached to the upper block 5. A weir 9 and a support shaft 10 are incorporated in the intermediate block 6. A measuring doctor blade 11 is mounted on the lower block 7.

  Each of the sealing doctor blade 8 and the measuring doctor blade 11 is formed in a rectangular shape along the axial direction of the gravure roll 3 in such a manner as to pass over almost the entire length (full width) of the gravure roll 3. These doctor blades 8 and 11 are made of, for example, stainless steel (SUS material), the thickness of the blade body is 0.15 mm to 0.2 mm, and the thickness of the blade tip is 0.08 mm. The length of the blade tip is set to 1.3 mm to 1.5 mm. Further, the distal end portions of the doctor blades 8 and 11 are arranged so as to be in sliding contact with the outer peripheral surface of the gravure roll 3 at a predetermined angle α (preferably α = 30 ° to 40 °).

  The dam 9 forms a reservoir 13 for storing the paint 12 to be supplied to the gravure roll 3. Various paints such as a non-magnetic paint and a magnetic paint can be applied as the paint 12 stored in the storage unit 13. A magnetic paint is used for manufacturing a magnetic recording medium such as a magnetic tape. The surface of the weir plate 9 facing the gravure roll 3 is an inclined surface that sequentially approaches the outer peripheral surface of the gravure roll 3 in the rotation direction of the gravure roll 3 (indicated by an arrow), and the weir is on the top of the inclined surface. The storage part 13 is formed by being formed. Incidentally, the slope angle θ of the inclined surface of the weir 9 is preferably set to 60 ° to 85 °, and the width of the weir, that is, the apex width w of the portion closest to the gravure roll 3 is 0.5 mm to 3. It is preferable to set to 0 mm.

  Further, the upper block 5, the intermediate block 6 and the lower block 7 are connected to the closing block 14 by screws or the like to form a mechanically integrated block structure. Side seal walls 15 are attached to both ends of the block structure by screws or the like. The side seal wall 15 is composed of, for example, a holder member 16 and a side seal 17 as shown in the figure, and is mounted in a state in which both ends of the block structure are closed.

The holder member 16 is made of a rigid body such as a metal and has predetermined conductivity. The side seal 17 is made of, for example, foamed polyurethane, foamed polyethylene, or the like, and has a curved surface 17 </ b> A corresponding to the outer peripheral surface of the gravure roll 3. The side seal 17 is attached to the holder member 16 by screws or the like. In addition, the conductivity of the holder member 16 and the side seal 17 is set such that, for example, the resistance between the holder member 16 and the side seal 17 and the gravure roll 3 is 10 ⁸ Ω or less.

  With this configuration, a shielding space 18 is formed inside the coating material supplier 4. The shielding space 18 is formed by closing the space formed by the block structure with the sealing doctor blade 8, the measuring doctor blade 11, and the side seal wall 15 described above. As a result, the interior of the coating material supplier 4 is sealed.

  The shielding space 18 faces the inclined surface of the dam 9, and the storage portion 13 formed by the inclined surface is disposed in the shielding space 18. In addition, a paint supply path 19 and a paint discharge path 20 communicate with the shielding space 18. The paint supply path 19 is formed by the upper block 5 and the intermediate block 6. The paint discharge path 20 is formed by the intermediate block 6 and the lower block 7. Further, a paint supply pipe 21 is connected to the paint supply path 19 via the closing block 14, and a paint discharge pipe 22 is connected to the paint discharge path 20 via the closing block 14. In FIG. 4, the paint supply pipe 21 is bifurcated and introduced into the paint supply path 19, while one paint discharge pipe 22 is pulled out from the paint discharge path 20. The number of paint supply pipes 21 introduced into the path 19 and the number of paint discharge pipes 22 drawn out from the paint discharge path 20 can be changed as appropriate.

  A control device 23 for a dam is connected to the block block 14. The control device 23 controls (finely adjusts) the position of the weir 9 with respect to the gravure roll 3. The control device 23 is provided with a rotary knob 24 that moves the support shaft 10 that supports the dam 9 in the axial direction. Then, by rotating the rotary knob 24, the gap g between the gravure roll 3 and the weir 9 can be arbitrarily controlled. That is, when the rotary knob 24 is rotated, the dam 9 moves forward and backward with respect to the gravure roll 3 according to the rotation direction and rotation amount (rotation angle).

  Then, the coating method of the coating material based on the operation | movement procedure of the coating device which consists of the said structure is demonstrated. First, the paint (for example, magnetic paint) 12 to be applied to the support 1 is sent to the paint supply path 19 through the paint supply pipe 21. The paint 12 thus sent to the paint supply path 19 is taken into the shielded space 18. The paint 12 taken into the shielding space 18 does not leak to the outside of the paint supplier 4 due to the closing action of the sealing doctor blade 8 and the side seal wall 15 described above.

  In the shielded space 18, a paint reservoir 13 is formed between the inclined surface of the dam 9 and the outer peripheral surface of the gravure roll 3 adjacent thereto by the damming action of the dam 9. In this case, the paint 12 stored in the storage unit 13 is simultaneously subjected to the weir-stopping action of the dam 9 and the action of gravity. For this reason, the paint is efficiently filled in the cell pattern 3P of the gravure roll 3. Moreover, since the coating material 12 collected in the storage unit 13 is stored without resisting gravity, the storage state becomes stable. Furthermore, since the outer peripheral part of the gravure roll 3 in contact with the paint 12 of the storage part 13 moves in the direction in which gravity acts (downward), the stored paint does not vortex. Therefore, the cell pattern 3P of the gravure roll 3 can be sufficiently and sufficiently filled with the paint.

  When the paint 12 is filled in the cell pattern 3P of the gravure roll 3 in this way, the paint filled portion is transferred to the contact portion with the metering doctor blade 11 by the rotation of the gravure roll 3. In the measuring doctor blade 11, the blade tip is brought into contact (sliding contact) with the gravure roll 3 to scrape off the excessively filled paint 12, that is, the paint 12 filled in a predetermined amount or more. As a result, the outer peripheral surface (cell pattern 3P) of the gravure roll 3 that has passed through the weighing doctor blade 11 is filled with a predetermined amount of paint 12.

  The predetermined amount of the coating material 12 filled in the outer peripheral surface of the gravure roll 3 is then moved around with the rotation of the gravure roll 3 and transferred to the side opposite to the coating material supplier 4, that is, to the support 1 side. At this time, at the contact portion between the support 1 and the gravure roll 3, the support 1 moves downward due to the relationship between the traveling direction Y of the support 1 and the rotation direction R of the gravure roll 3, whereas the gravure roll The outer periphery of 3 moves upward. Therefore, a transfer bead (a pool of paint) 25 is formed at the contact portion (line contact portion) between the support 1 and the gravure roll 3 as shown in FIG. The transfer bead 25 is formed in a wedge shape on the downstream side (lower side) in the running direction of the support 1 so as to be adjacent to the contact portion between the support 1 and the gravure roll 3. In addition, since the support 1 and the gravure roll 3 are in contact with each other substantially in point contact when viewed from the axial direction of the gravure roll 3, the transfer bead 25 formed in the contact portion is in the traveling direction of the support 1. It becomes a narrow bead shape (wedge shape).

  Further, when the gravure roll 3 is rotated in the R direction, an air flow in the R direction is generated around the gravure roll 3 (in the vicinity of the outer peripheral surface of the roll). This air flow is generated uniformly over the axial direction of the gravure roll 3 because the outer diameter of the gravure roll 3 is uniformly the same in the axial direction. Further, as described above, the air pressure Ap due to the airflow acts uniformly on the transfer bead 25 formed at the contact portion between the support 1 and the gravure roll 3 as described above. The air pressure Ap acts to push the transfer bead 25 into the back side (contact point side of the support 1 and the gravure roll 3) in a wedge-shaped space formed at the contact portion of the support 1 and the gravure roll 3. Therefore, the spread of the transfer bead 25 is effectively suppressed by the action of the air pressure Ap. For this reason, a very narrow transfer bead 25 can be stably formed at the contact portion between the support 1 and the gravure roll 3.

  Incidentally, when the support body 1 is run in the Y direction, an air flow toward the Y direction is generated around the support body 1 (near the surface). However, this air flow is once at the contact portion between the support body 1 and the gravure roll 3. Blocked. For this reason, the air flow generated by the travel of the support 1 hardly acts on the transfer bead 25 formation site.

  In this way, when the support 1 is run in the Y direction with the transfer bead 25 having a very narrow width formed at the contact portion between the support 1 and the gravure roll 3, the paint is drawn out from the transfer bead 25 by the required amount. Thus, the paint is applied (transferred) to the surface of the support 1. At this time, gravity acts along the traveling direction Y of the support 1 at the contact interface between the support 1 and the coating material (transfer bead 25). For this reason, when the support 1 is caused to travel, the paint is smoothly drawn out from the transfer bead 25, and the paint can be easily put on the surface of the support 1. Therefore, a highly accurate and uniform thin film layer (coating film) can be formed on the surface of the support 1.

  Incidentally, as the vertical posture angle of the support 1 supported between the two guide rolls 2, as shown in FIG. 6, the angle formed by the support 1 and the vertical axis Z should be set to β = 15 ° or less. It is preferable to set β = 10 ° or less, more preferably β = 5 ° or less.

  Here, when the support 1 is run in the Y direction between the two guide rolls 2 and the gravure roll 3 is rotated in the R direction as in the above embodiment, the paint is applied to the surface of the support 1. , While the support 1 is run in the direction opposite to the Y direction between the two guide rolls 2 and the gravure roll 3 is rotated in the direction opposite to the R direction, As a comparative example with the present invention, a case where a paint is applied to the surface (a case where the technique described in Japanese Patent Application Laid-Open No. 2002-177836 is applied) will be described the result of evaluating each application state.

  First, as a coating material for tape undercoating, a coating material having a mass ratio of binder solution: solid content 2%, binder: acrylic resin, methyl ethyl ketone: 40%, cyclohexanone: 58%, pure water: 2% was used.

  Further, the application conditions were such that the gravure roll 3 had a diameter of 40 mm and the cell pattern 3P had a turtle shell shape and 150 lines with an axis angle of 60 degrees (150 turtle shell cells were engraved in one inch). Then, a line contact kiss touch method was adopted in which the cell engraving width was 5.0 mm wider than both ends of the 620 mm wide support 1 and applied to the entire width of the support 1. Further, the tension of the support 1 at the application position was set to 0.8 N / cm. Furthermore, the coating speed was changed under the conditions of a low speed coating of 5 to 30 m / min, a high speed coating of 150 to 300 m / min, and the supply amount of the paint under conditions of 1.5 L (liter) / min and 2.5 L / min.

  Under the above coating conditions, as shown in FIG. 7, the coating speed was set to a low speed (5 to 30 m / min) and the paint supply amount was set to 1.5 L / min. "Example 1", a coating speed set to a low speed (5 to 30 m / min), and a paint supply amount set to 2.5 L / min were referred to as "Example 2" and "Comparative Example 2", respectively. Moreover, what set the application | coating speed to high speed (150-300 m / min) and the coating-material supply amount to 1.5 L / min is set as "Example 3" and "Comparative Example 3," respectively, and application | coating speed is high-speed (5- 30 m / min) and the paint supply rate set to 2.5 L / min were designated as “Example 4” and “Comparative Example 4”, respectively. Then, the paint was actually applied under each application condition, and the application state such as application unevenness and coating film uniformity was evaluated and observed. In addition, since the tape undercoat paint described above is transparent, a dye (magenta) was appropriately added to facilitate observation of the application state.

[Evaluation of Examples 1 to 4]
In any of the embodiments, the support 1 moves between the two guide rolls 2 from the top to the bottom. In this case, the paint supplied through the paint supply path 19 of the paint supplier 4 is a weir. The reservoir 13 in the shielding space 18 formed by the inclined surface of the board 9 is in direct contact with the outer peripheral surface (cell forming surface) of the gravure roll 3, and the paint is immediately metered by the metering doctor blade 11. For this reason, the coating material is carried to the support 1 side by the rotation of the gravure roll 3 in a state where bubbles and the like do not mix.

  Further, an extremely narrow transfer bead 25 is stably formed at the contact portion between the support 1 and the gravure roll 3, and bubbles generated when scratched with a doctor blade are compressed and broken by the weir plate 9. However, by increasing the flow velocity, the air bubbles and the return paint accumulated in the upper part of the paint supply device 4 are discharged at a stroke, so that the balance between the supply of paint and the return amount is improved without stagnation of the return paint. In any of the examples, an application state excellent in coating film uniformity without application unevenness and streaks over the entire width of the support 1 was obtained. Moreover, the shape of the winding roll which winds up the support body 1 in which the coating film was formed was also favorable, and good quality free from dirt and swelling at both ends of the support body 1 could be secured. Therefore, according to the coating method of the present invention, the coating metering to the gravure roll 4 is stable, the coating unevenness and the coating film uniformity are excellent, and the coating conditions such as the coating range and coating supply amount in the low-speed coating and the high-speed coating are satisfied. A wide appropriate range can be secured.

[Evaluation of Comparative Examples 1 to 4]
In any of the comparative examples, the support moves between the two guide rolls from the bottom to the top. In this case, the paint is metered in the upper reservoir through the weir in the paint supplier. Then, the coating material is carried to the support side by the rotation of the gravure roll. Then, a transfer bead is formed at the contact portion between the support and the gravure roll, and the paint is transferred to the surface of the support that passes through the transfer bead. A problem occurred in the balance of the return amount, and the paint storage state became unstable in the paint feeder. For this reason, transfer bead unevenness due to insufficient paint filling into the gravure roll occurred, resulting in coating unevenness and deterioration of coating film uniformity. Further, in Comparative Example 2 in which the coating amount supplied was larger than that in Comparative Example 1, although the transfer bead unevenness was improved, the coating state inferior to Examples 1 to 4 in terms of coating unevenness and coating film uniformity. Only obtained.

  On the other hand, in Comparative Example 3 in which the coating amount supplied is small due to high-speed coating, bubbles are generated and streaky beads are generated, coating unevenness and coating film uniformity are deteriorated, and dirt and swell are formed at both ends of the support. It was in a state that adversely affects the quality, such as seeing. Further, in Comparative Example 4 in which the amount of coating material supplied was larger than that in Comparative Example 3, the streaky beads were stable, but as the coating speed increased, fine bubbles frequently occurred and bubbles were difficult to escape. For this reason, there is an adverse effect on the balance between the supply amount and the return amount of the paint, the stored paint becomes vortex in the paint supply device, the metering filling state becomes unstable, the transfer bead is disturbed, and the coating unevenness etc. Caused deterioration.

For reference, for low-speed coating, a paint containing ultra-fine powder of TiO ₂ diluted with a solvent of MIBK (methyl, iso, butyl, ketone) (solid content is 30%) is used. When produced and evaluated under the same conditions as in Examples 1 and 2 and Comparative Examples 1 and 2, the same results as above were obtained.

It is a side schematic diagram showing the composition of the coating device application device concerning the embodiment of the present invention. It is a figure which shows the other example of the support form at the time of supporting a support body in a substantially vertical attitude | position. It is a sectional side view which shows the structure of the coating material supply device in embodiment of this invention. It is a disassembled perspective view which shows the structure of the coating material supply device in embodiment of this invention. It is a side view which shows the formation state of the transfer bead in embodiment of this invention. It is a figure explaining the angle range at the time of supporting a support body in a perpendicular posture. It is a figure which shows the application conditions of the Example at the time of evaluating an application state, and a comparative example. It is a schematic side view which shows the structural example of the conventional coating device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Support body, 2 ... Guide roll, 3 ... Gravure roll, 4 ... Paint feeder, 9 ... Weir board, 13 ... Storage part

A coating material coating apparatus according to the present invention includes a support body that travels in one direction by a driving unit, and a gravure roll that is horizontally disposed in a direction orthogonal to the travel direction of the support body . against, the coating apparatus is contacted with the gravure roll rotates to apply the coating material, drive means, and having a guide member for supporting substrates in a vertical position, the support which is supported in a vertical position by the guide member vertically The gravure roll travels from top to bottom along the direction, and the gravure roll is horizontally supported by the support member supported in the vertical posture by the guide member so that the wrapping angle of the support member with respect to the gravure roll becomes zero. together are arranged in a state of line contact, so that the roll outer portion moves upward as the traveling direction of the support opposite directions at the contact position between the support By rolling, and forms a bead of wedge-shaped by coating the contact position of the support.

In this paint coating apparatus, the support is supported in a vertical posture by a guide member and travels so as to move from top to bottom, and a gravure roll is brought into line contact with the support so that the winding angle becomes zero. By rotating the gravure roll so that the outer periphery of the roll moves upward at the contact position, a narrow transfer bead is formed at the contact portion between the gravure roll and the support, and the transfer bead is rotated by the gravure roll. It will be stably held by the air flow accompanying.

Further, the method of applying the paint according to the present invention, a support running in one direction, by using a gravure roll which is horizontally arranged in a direction perpendicular to the running direction of the support, to a running support On the other hand, in a coating method in which a rotating gravure roll is brought into contact and applied with a coating material, the support body is moved so as to move from top to bottom along the vertical direction while being supported in a vertical position at a predetermined position. The gravure roll is rotated so that the outer peripheral part of the roll moves upward in the direction opposite to the traveling direction of the support at the contact position, and the rotating gravure roll has a wrapping angle of the support with respect to the gravure roll is zero . In this way, a wedge-shaped bead made of a paint is formed at the contact position by making a line contact with the support body from a horizontal direction at a predetermined position .

In the method of applying the coating material, caused to travel to move from top to bottom a support to support the vertical position at a predetermined position, the winding angle of the gravure roll makes line contact so that zero to the support member In addition, by rotating the gravure roll so that the outer periphery of the roll moves upward at the contact position, a narrow transfer bead is formed at the contact portion between the gravure roll and the support, and the transfer bead is formed on the gravure roll. It will be stably held by the air flow accompanying the rotation.

A coating material coating apparatus according to the present invention includes a support body that travels in one direction by a driving unit, and a gravure roll that is horizontally disposed in a direction orthogonal to the travel direction of the support body. On the other hand, in a coating apparatus that applies a coating by bringing a rotating gravure roll into contact, the driving means has a guide member that supports the support body in a vertical posture, and the support body supported in the vertical posture by the guide member is gravity-loaded. The gravure roll runs on a support that is supported in a vertical posture by the guide member so that the winding angle of the support with respect to the gravure roll becomes zero along the direction in which the gravure acts. It is arranged in a line contact state from the horizontal direction, and the roll outer periphery moves upward in the opposite direction to the running direction of the support at the contact position with the support. By rotating so that, and forms a bead of wedge-shaped by coating the contact position of the support.

In addition, the coating method according to the present invention uses a support that travels in one direction and a gravure roll that is horizontally disposed in a direction orthogonal to the travel direction of the support. On the other hand, in the coating method in which the rotating gravure roll is brought into contact with the coating method to apply the paint, the support is supported so as to move from top to bottom along the direction in which gravity acts while supporting the support in a vertical position at a predetermined position. The gravure roll is rotated so that the outer peripheral portion of the roll moves upward in a direction opposite to the traveling direction of the support at the contact position with the support, and the rotating gravure roll is rotated around the angle of the support with respect to the gravure roll. In such a manner, a wedge-shaped bead made of paint is formed at the contact position by bringing the support into line contact with the support body from a horizontal direction at a predetermined position.

Claims (9)

In a coating apparatus that applies a paint by bringing a rotating gravure roll into contact with a support traveling in one direction by a driving means,
The drive means has a guide member for supporting the support body in a substantially vertical posture, and travels so as to move the support body supported in a substantially vertical posture by the guide member from top to bottom.
The gravure roll is disposed in a state of being substantially in line contact with the support supported by the guide member in a substantially vertical posture so that a winding angle of the support with respect to the gravure roll is substantially zero, and A coating material coating apparatus, wherein the outer periphery of the roll rotates at a position in contact with the support so as to move upward in a direction opposite to the traveling direction of the support. The paint application apparatus according to claim 1, wherein the guide member supports the support body in a substantially vertical posture so that an angle formed by the support body and a vertical axis is 15 ° or less. A paint supply means for supplying paint to the gravure roll on the opposite side of the contact position with the support;
The coating material supply means forms a reservoir for storing the coating material to be supplied to the gravure roll, and the surface facing the gravure roll sequentially approaches the outer peripheral surface of the gravure roll in the rotation direction of the gravure roll. The coating apparatus according to claim 1, further comprising a weir that is an inclined surface. The drive means has two upper and lower guide members that support the support in a substantially vertical posture,
The coating apparatus for coating material according to claim 1, wherein the gravure roll is arranged in a substantially line contact with the support body supported in a substantially vertical posture between the two guide members. The coating apparatus for coating material according to claim 3, wherein a gradient angle of the inclined surface is set to 60 ° to 85 °. The coating device for coating material according to claim 3, wherein the tip width of the closest portion of the weir to the gravure roll is set to 0.5 mm to 3.0 mm. In a coating method in which a rotating gravure roll is brought into contact with a support traveling in one direction to apply a paint,
The support body is moved so as to move from top to bottom while being supported in a substantially vertical posture at a predetermined position, and the outer peripheral portion of the roll is in a direction opposite to the traveling direction of the support body at the contact position with the support body The gravure roll is rotated so as to move upward, and the rotating gravure roll is substantially in line contact with the support at the predetermined position so that the winding angle of the support with respect to the gravure roll becomes substantially zero. A method of applying a paint characterized in that The coating method according to claim 7, wherein the support is supported in a substantially vertical posture so that an angle formed by the support and a vertical axis is 15 ° or less at the predetermined position. The support is supported in a substantially vertical posture by two upper and lower guide members, and the gravure roll is brought into substantially line contact with the support supported in a substantially vertical posture between the two guide members. The coating method of the coating material of Claim 7.

Images