TW201836713A - Coating apparatus and method for producing coating film - Google Patents

Abstract

Provided is a coating apparatus including: a coating roller having recesses in a circumferential surface thereof; and a supply unit configured to supply coating liquid to the circumferential surface of the coating roller. The coating roller is configured to bring the coating liquid supplied to the recesses into contact with a coating object, while rotating so that the circumferential surface thereof moves in a direction opposite to a moving direction of the coating object, thereby coating the coating object with the coating liquid to form a coating film. The coating roller has an outer diameter of 60 to 80 mm. The difference between a value of rotation speed of the coating roller and a value of moving speed of the coating object is 0 to 60 m per minute.

Description

Coating device and method for manufacturing coating film

The invention relates to a coating device and a method for manufacturing a coating film.

Conventionally, as a coating apparatus, for example, there is known a gravure coating apparatus provided with a coating roller that applies a coating liquid to a coating object such as a thin plate member to form a coating film. This type of gravure coating apparatus includes a cylindrical coating roller having a concave portion on an outer peripheral surface, and a supply portion that supplies a coating liquid to the outer peripheral surface of the coating roller. The gravure coating device is configured to continuously apply the coating liquid to the coating object by contacting the coating liquid supplied to the outer peripheral surface of the coating roller and rotating the coating roller. . In this gravure coating apparatus, the supplied coating liquid enters the recessed portion on the outer peripheral surface of the coating roller, and a part of the outer peripheral surface is in contact with the object to be coated and the coating roller is rotated. Thereby, the coating liquid in the outer peripheral portion in contact with the coating object is applied to the coating object. In this gravure coating apparatus, the coating liquid is transferred from the outer peripheral surface of the coating roller and applied to the coating object, and the coating roller is further rotated. Next, a coating liquid is supplied from the supply portion to the outer peripheral surface of the void formed in the recessed portion. As such a coating device, a coating roller having an outer diameter of 45 to 150 mm is proposed. According to this coating device, the outer diameter of the coating roller is small, and the coating liquid is exposed to the outside air accordingly during the period during which the coating liquid is supplied to the concave portion of the coating roller until it is transferred to the coating object. Time becomes shorter. This makes it possible to suppress a decrease in coating performance even when a coating liquid that is easy to dry is used (see Patent Document 1). In addition, as the coating device described above, a coating device has been proposed, which includes a coating roller having an outer diameter of 40 to 55 mm, and a supply unit that supplies coating to a concave portion of the coating roller. And the supply unit includes: a scraper blade that seals the coating liquid on the downstream side of the coating roller in the direction of rotation and removes the remaining coating liquid adhered to the coating roller; and a sealing sheet that is in the direction of rotation of the coating roller The coating liquid is sealed on the upstream side. According to this coating apparatus, even if the outer diameter of the coating roller is small, the coating liquid can be uniformly applied to the object to be coated by the coating roller (see Patent Document 2). [Prior Art Literature] [Patent Literature] [Patent Literature 1] Japanese Patent Laid-Open No. 2014-226637 [Patent Literature 2] Japanese Patent Laid-Open No. 2002-186888

[Problems to be Solved by the Invention] However, in the coating apparatus described in Patent Documents 1 and 2, there may be a case where a so-called streak or uneven coating failure occurs in a coating liquid (that is, a coating film) to be applied. It is difficult to say that coating can be performed with sufficient stability. Moreover, in order to suppress this coating failure, it is necessary to set coating conditions within a narrow range. On the other hand, during the period when the coating object is being conveyed to the coating roller, there may be cases where foreign matter adheres to the coating object. If coating is performed in such a state where the foreign matter is adhered, the foreign matter is mixed into the coating. Liquid, which reduces the quality of the coating obtained. Therefore, it is desirable to remove such foreign matter. In view of the above circumstances, the present invention aims to provide a coating device and a method for manufacturing a coating film that can suppress coating failure and apply a coating liquid to a coating object, and can remove foreign matter by coating. . [Technical means to solve the problem] In order to solve the above-mentioned problems, the present inventors conducted intensive research and found that in gravure coating, the coating liquid (coating film) on the object to be coated and the coating on the coating roller Between coatings (coating film) (the coating liquid on the coating roller is transferred to the side before the coating object), or between the coating and the coating roller (the coating liquid on the coating roller is transferred (To the side behind the coating object), air is drawn in (see FIG. 3). Furthermore, it was found that as the difference between the value (size) of the rotation speed of the coating roller and the value (size) of the moving speed of the coated object becomes larger, the amount of air entrained increases, and the coated object relative to the coated The covering roller is in a floating state, but the bulge of the coating liquid is not formed between the coating roller and the object to be coated. As a result, coating failure occurs. In addition, when the outer diameter of the coating roller is large, it is found that if the value (size) of the rotation speed of the coating roller is different from the value (size) of the moving speed of the coating object, the value range is not narrow. Then, when the coating liquid on the coating roller is transferred to the coating object, it is difficult to suppress the amount of air entrained as described above, which prevents the sufficient formation of the ridges and tends to cause poor coating. On the other hand, it was found that when the coating roller is small, even if the range of the difference is large, the amount of air entrained as described above can be suppressed, and bumps can be sufficiently formed, which can suppress the occurrence of coating failure. The tendency. In addition, when the outer diameter of the coating roller is 60 to 80 mm, it has been found that even if the difference is a large range of 0 to 60 m / min, the coating liquid can be suppressed from being accompanied by air, thereby suppressing poor coating. In addition, when the difference between the outer diameter of the coating roller and the speed is within the above range, the protrusions are sufficiently formed on the coated object by the coating liquid to suppress the floating of the coated object, so the coating is applied. The covering is in full contact with the coating liquid. In addition, friction occurs between the coating object and the coating liquid due to the speed difference between the coating roller and the coating object during the contact. By this rubbing, it was found that even if a foreign object adheres to the surface of the coated side of the object to be coated before coating, the foreign object can be removed to complete the present invention. That is, the coating apparatus of the present invention is configured to include: a coating roller that applies a coating liquid to a relative-moving to-be-coated object, and has a concave portion on an outer peripheral surface; and a supply portion having a chamber and The coating liquid in the cavity is supplied to at least the recessed portion of the outer peripheral surface of the coating roller; and the coating roller is rotated by moving the outer peripheral surface in a direction opposite to the moving direction of the coating object. And contacting the coating liquid supplied to the recess with the object to be coated, and applying the coating liquid to the object to be coated and forming a coating film; the outer diameter of the coating roller is 60 to 80 mm; and the difference between the value of the rotation speed of the coating roller and the value of the movement speed of the coating object is 0 to 60 m / min. Here, the rotation speed of the coating roller means the moving speed (peripheral speed) of the outer peripheral surface of the coating roller. In the coating device configured as described above, the tension of the coating object on the downstream side from the position where the coating liquid is applied in the moving direction of the coating object may be 50 to 1000 N / m. . In the coating device having the above configuration, the thickness of the object to be coated may be 10 to 70 μm. In the coating device having the above configuration, the viscosity of the coating liquid may be 0.5 to 50 mPa · s. The manufacturing method of the coating film of the present invention is a method including: a coating step of applying a coating liquid to a relative moving to-be-coated object and a coating roller having a concave portion on an outer peripheral surface to The outer peripheral surface is rotated so as to move in a direction opposite to the moving direction of the coating object, and the coating liquid supplied to the recess is brought into contact with the coating object, and the coating liquid is applied to the coating object. Covering and forming a coating film; and the coating step includes: a supplying step using a supply unit having a chamber and supplying the coating liquid in the chamber to at least the recess on the outer peripheral surface of the coating roller, and At least the concave portion on the outer peripheral surface of the coating roller supplies the coating liquid in the chamber; the outer diameter of the coating roller is 60 to 80 mm; the value of the rotation speed of the coating roller is the same as that of the coating object. The difference in the value of the moving speed is set to 0 to 60 m / min. Here, as described above, the rotation speed of the coating roller means the moving speed (peripheral speed) of the outer peripheral surface of the coating roller.

Hereinafter, a coating apparatus according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, an example in which the thin plate member 50 is used as the object to be coated 50 is described, but the object to be coated 50 is not limited to the thin plate member 50. As shown in FIGS. 1 and 2, the coating apparatus 1 of this embodiment includes a coating roller 2 that applies a coating liquid 30 to a coating object 50 to form a coating film 40 and has a concave portion on an outer peripheral surface. 2a; and a supply unit 3 having a chamber and supplying the coating liquid 30 in the chamber to at least the recessed portion 2a on the outer peripheral surface of the coating roller 2. The coating apparatus 1 according to this embodiment is configured to rotate the coating roller 2 in the opposite direction to the moving direction of the coating object 50 and to contact the coating liquid 30 supplied to the recessed portion 2 a with the coating object 50. The coating liquid 30 is applied to the coating object 50 to form a coating film 40. The coating device 1 including the coating roller 2 described above is generally called a gravure coating device. In the coating device 1 of this embodiment, the supply unit 3 includes a first blade member 6 that supplies a coating liquid to the outer peripheral surface of the coating roller 2 on the downstream side of the coating roller 2 in the rotation direction. The coating liquid 30 outside the concave portion 2a in 30 is removed. Furthermore, in the coating device 1 of this embodiment, the supply section 3 includes a second blade member 8 which is located upstream of the coating roller 2 in the rotation direction so that the coating liquid 30 does not leak from the supply section 3. Way sealed. The coating apparatus 1 of this embodiment is configured to supply a coating liquid 30 to the outer peripheral surface of the coating roller 2 by a supply unit 3, and to remove the inner concave portion 2a of the coating liquid 30 supplied to the outer peripheral surface by the first blade member 6.外 的 应用 液 30。 Outside the coating liquid 30. The coating device 1 according to this embodiment is configured to relatively move the thin plate member 50 in a specific direction with respect to the supply unit 3. In addition, the coating device 1 of this embodiment is configured to rotate the coating roller 2 in one direction, and make a part of the coating liquid 30 supplied to the outer peripheral surface of the coating roller 2 and a thin plate serving as the coating object 50. The member 50 is in contact, and the coating liquid 30 in the recess 2 a is continuously applied to the thin plate member 50. In addition, the rotation direction of the coating roller 2 (that is, the moving direction of the outer peripheral surface of the coating roller 2) and the moving direction of the thin plate member 50 are configured such that the coating portion becomes the opposite direction. The coating liquid 30 is usually applied to a thin plate member 50 and then cured on the thin plate member 50 to form a coating film 40. Examples of the coating liquid 30 include a solution containing a hardened polymer material. Examples of the hardened polymer material include a thermosetting material, an ultraviolet curing material, and an electron beam curing material. Among these, the polymer material is preferably a UV-curable material. The term "coating" includes printing or coating. Although the viscosity of the coating liquid 30 is not particularly limited, it is preferably 0.5 to 50 mPa · s, and more preferably 10 to 50 mPa · s. When the viscosity of the coating liquid 30 is 0.5 to 50 mPa · s, the accompanying liquid 30 can be further suppressed from being accompanied by air. Thereby, since the bulge of the coating liquid 30 can be more fully formed between the thin plate member 50 and the coating roller 2, a coating failure can be suppressed further, and a foreign material can be removed further. The viscosity of the coating liquid 30 is a value measured at a shear rate of 1 (1 / s) at 20 ° C using a rheometer (RS1 type, manufactured by HAAKE). The thin plate member 50 is generally formed in a band shape. Examples of the thin plate member 50 include a resin film. The width of the thin plate member 50 is generally shorter than the length in the rotation direction of the coating roller 2. Although the thickness of the thin plate member 50 is not particularly limited, it is, for example, about 5 to 80 μm, and preferably 10 to 70 μm. The coating roller 2 is formed in a cylindrical shape. The coating roller 2 is configured to rotate with a cylindrical axis as a rotation axis. The coating roller 2 is arranged so that a part of the coating liquid 30 supplied to the outer peripheral surface is in contact with a part of the thin plate member 50. In addition, the coating roller 2 is configured to cause the coating liquid on the outer peripheral surface to contact the thin plate member 50 in the circumferential direction by rotating at least one turn. The outer peripheral surface of the coating roller 2 includes a peripheral surface portion 2b which is arranged along the circumference when viewed from one side of the cylindrical axis direction of the cylindrical coating roller 2; and a recessed portion 2a which is recessed more inward than the peripheral surface portion 2b. trap. A plurality of the recessed portions 2 a are formed on the outer peripheral surface of the coating roller 2. Further, a plurality of recessed portions 2 a are formed over the entire outer peripheral surface of the coating roller 2. In the coating device 1 of this embodiment, the pattern shape of the recessed portion 2a is not particularly limited. Examples of the pattern shape include linear shapes (not intersecting each other (for example, a plurality of parallel linear grooves), or honeycomb shapes). (A plurality of linear grooves crossing each other), etc. In addition, the linear or honeycomb-shaped recessed portion 2a may be formed at 100 to 2500 lines / inch. The outer diameter of the coating roller 2 is 60 to 80 mm. In addition, the outer diameter is the outermost diameter of the coating roller 2. The outer diameter of the coating roller 2 is 60 to 80 mm, and the difference between the rotation speed Vr of the coating roller 2 and the moving speed Vm of the thin plate member 50 ( Vr-Vm) is 0 to 60 m / min, and the two complement each other, thereby preventing the coating liquid 30 from contacting the thin plate member 50 in a state accompanied by air with the rotation of the coating roller 2. This makes it possible to Suppressing air is interposed between the coating liquid 30 and the thin plate member 50 to apply the coating liquid 30 to the thin plate member 50, so that sufficient protrusions of the coating liquid 30 can be formed between the coating roller 2 and the thin plate member 50 The length (width) in the longitudinal direction of the coating roller 2 is not particularly limited, and is, for example, 500 to 2500 mm. The so-called rotation speed of the coating roller 2 (Size) The difference between the value (size) Vm of the moving speed of Vr and the sheet member 50 is the value (absolute value) Vr of the rotation speed of the coating roller 2 minus the value (absolute value) Vm of the speed of the sheet member 50 The difference is 0 to 60 m / min (V = Vr-Vm). The rotation speed Vr of the coating roller 2 is the moving speed (peripheral speed) of the outer peripheral surface of the coating roller 2. The difference V is 0 to 60 m / min, the outer diameter of the coating roller 2 is 60 to 80 mm, and the two complement each other, thereby suppressing the coating liquid 30 (coating film) on the sheet member 50 and the coating liquid on the coating roller 2 30 (coating film), or between the sheet member 50 and the coating roller 2, the amount of air (refer to FIG. 3) entrained by the movement of the sheet member 50 and the rotation of the coating roller 2, and the coating The contact state (positional relationship) between the roller 2 and the thin plate member 50 is stable. In this way, the coating liquid 30 can be applied to the thin plate member 50 because the useless air is prevented from being drawn in, so it can be between the coating roller 2 and the thin plate member 50 A sufficient bulge of the coating liquid 30 is formed. The moving speed of the thin plate member 50 is, for example, 5 to 100 m / min. The thin plate member 50 is conveyed, for example, by a conveying device (not shown). In this case, the conveying speed and the Moving speed When. The coating device 1 of this embodiment is configured such that the thin plate member 50 is pressed against the outer peripheral surface of the coating roller 2. In the coating device 1 of this embodiment, the tension of the thin plate member 50 is not particularly limited. For example, The tension of the thin plate member 50 is the tension of the thin plate member further downstream than the position where the coating liquid 30 is applied in the moving direction of the thin plate member 50, preferably 50 to 1000 N / m, and more preferably 100 to 500 N By setting the tension of the thin-plate member 50 on the downstream side to 50 to 1000 N / m, it is possible to further suppress air from being applied to the coating solution 30. This allows a gap between the thin-plate member 50 and the coating roller 2. The ridges of the coating liquid 30 are more fully formed, so that coating failure can be suppressed further, and foreign matter can be further removed. The supply unit 3 includes a chamber 3a for supplying the coating liquid 30 stored inside to the outer peripheral surface of the coating roller 2, an inflow path 3b for allowing the coating liquid 30 to flow into the chamber 3a, and an outflow path 3c for The coating liquid 30 flows out from the chamber 3a; and a circulation tank 3d for circulating the coating liquid 30 flowing out through the outflow path 3c to the inflow path 3b. The chamber 3 a is configured to supply the coating liquid 30 to the outer peripheral surface of the coating roller 2. The above-mentioned chamber 3 a is formed in a hollow shape of an opening on the supply target side of the coating liquid 30, and the opening is blocked by the coating roller 2. The chamber 3a is configured to fill the internal space with the coating liquid 30, and to supply the coating liquid 30 to the outer peripheral surface of the coating roller 2 through the opening. That is, the cavity 3a is generally referred to as a closed cavity. The chamber 3 a is disposed on the rear side of a portion where the coating liquid 30 is applied to the thin plate member 50. The cavity 3 a is arranged so that the above-mentioned openings are along the outer peripheral surface of the coating roller 2. The chamber 3a is configured to store the coating liquid 30 flowing in through the inflow path 3b. In addition, the chamber 3 a includes a second blade member 8 in a portion close to the outer peripheral surface of the coating roller 2 so as not to leak the coating liquid 30. The chamber 3 a is configured to suppress the leakage of the coating liquid 30 by the second blade member 8, and to supply a part of the coating liquid 30 stored inside to the outer peripheral surface of the coating roller 2. One side of the inflow path 3b is connected to the circulation groove 3d, and the other side is connected to the chamber 3a. The inflow path 3b includes a pump P for conveying the coating liquid 30. The inflow path 3b is configured such that the coating liquid 30 that is pumped by the pump P is sent from the circulation tank 3d to the chamber 3a. Examples of the pump P include a conventionally known pump such as a gear pump, a diaphragm pump, a plunger pump, and a serpentine pump. One side of the outflow path 3c is connected to the chamber 3a, and the other side is connected to the circulation groove 3d. The outflow path 3c is configured to transfer the coating liquid 30 from the chamber 3a to the circulation tank 3d. The circulation tank 3d is configured to temporarily store the coating liquid 30 conveyed through the outflow path 3c. The supply unit 3 is configured to store the coating liquid 30 flowing in through the inflow path 3b in the chamber 3a, and to supply a part of the stored coating liquid 30 to the outer peripheral surface of the coating roller 2. The supply unit 3 is configured to feed the coating liquid 30 that is not supplied to the outer peripheral surface of the coating roller 2 in the chamber 3a to the circulation tank 3d through the outflow path 3c. In this way, the supply unit 3 is configured to circulate the coating liquid 30 and supply a part of the circulating coating liquid 30 to the outer peripheral surface of the coating roller 2. The first blade member 6 is disposed on the forefront side of the chamber 3a in the rotation direction of the coating roller 2. The first blade member 6 is generally formed in a plate shape. The first blade member 6 is arranged so that at least a part of the first blade member 6 is in contact with the peripheral surface portion 2 b on the outer peripheral surface of the coating roller 2. The first blade member 6 is configured to remove the coating liquid 30 attached to the peripheral surface portion 2b of the outer peripheral surface of the coating roller 2 by the above-mentioned contact portion, and to retain the coating liquid 30 in the recessed portion 2a. Examples of the first blade member 6 include a doctor blade. The coating device 1 according to this embodiment is configured to transfer the coating liquid 30 remaining on the outer peripheral surface of the coating roller 2 by the first blade member 6 to the thin plate member 50 and transfer the coating liquid 30 thereon. In the coating device 1 of this embodiment, the thickness of the coating liquid 30 applied to the thin plate member 50 may also be 0.1 to 10 μm. Next, an embodiment of a method for producing a coating film according to the present invention will be described. The manufacturing method of the coating film 40 of this embodiment can be performed by using the coating apparatus 1 mentioned above. The method for producing a coating film according to this embodiment includes a coating step of applying a coating liquid 30 to a relative moving object (here, for example, a thin plate member) 50 and having an outer peripheral surface The coating roller 2 of the recessed portion 2a rotates so that the outer peripheral surface moves in the opposite direction to the moving direction of the coated object 50, and the coating liquid 30 supplied to the recessed portion 2a contacts the coated object 50. Then, the coating liquid 30 is coated on the coating object 50 and a coating film 40 is manufactured. The coating step includes a supply step for applying the coating using a supply portion having a chamber 3a and supplying the coating liquid 30 in the chamber 3a to at least the recessed portion 2a on the outer peripheral surface of the coating roller 2. At least the concave portion 2a on the outer peripheral surface of the roller 2 supplies the coating liquid 30 in the cavity 3a. In the manufacturing method of the coating film 40 of this embodiment, the outer diameter of the coating roller is 60 to 80 mm, and the value of the rotation speed Vr of the coating roller 2 and the moving speed of the coating object 50 are The difference between the values Vm is set to 0 to 60 m / min. The rotation speed Vr of the coating roller 2 is the moving speed (peripheral speed) of the outer peripheral surface of the coating roller 2. In the coating step, for example, the coating liquid 30 is circulated and the coating liquid 30 is supplied to the concave portion 2 a on the outer peripheral surface of the coating roller 2 by, for example, the supply portion 3 described above. By supplying the coating liquid 30 in this manner and rotating the coating roller 2, the coating liquid 30 supplied to the concave portion 2 a of the outer peripheral surface of the coating roller 2 is applied to the object to be coated 50. That is, the coating liquid 30 in the recessed portion 2 a is in contact with the object to be coated 50 and transferred to form a coating film 40. As described above, the coating apparatus 1 according to this embodiment is configured to include: a coating roller 2 that applies a coating liquid 30 to a relative-moving coating object 50 and has a concave portion 2a on the outer peripheral surface; and The supply unit 3 has a chamber 3a, and supplies the coating liquid 30 in the chamber 3a to at least the recessed portion 2a on the outer peripheral surface of the coating roller 2; The surface is rotated so as to move in a direction opposite to the moving direction of the coating object 50, and the coating liquid 30 supplied to the recess 2a is brought into contact with the coating object 50, and the coating liquid 30 is coated on The coated object 50; the outer diameter of the coated roller 2 is 60 to 80 mm; the difference between the value Vr of the rotation speed of the coated roller 2 and the value Vm of the movement speed of the coated object 50 V (= Vm-Vr) is 0 to 60 m / min. According to this configuration, when the outer diameter of the coating roller 2 is 60 mm to 80 mm, the difference between the absolute value Vr of the rotation speed of the coating roller 2 and the absolute value Vm of the moving speed of the coating object 50 is 0. ～ 60 m / min, and between the coating liquid 30 (coating film) on the coating object 50 and the coating liquid 30 (coating film) on the coating roller 2, or between the coating object 50 and the coating The amount of air entrained between the covering rollers 2 accompanying the movement of the coating object 50 and the rotation of the coating roller 2, and stabilizes the contact state (positional relationship) between the coating roller 2 and the coating object 50. . In this way, because the useless air can be suppressed and the coating liquid 30 is applied to the coating object 50, a sufficient bulge of the coating liquid 30 can be formed between the coating roller 2 and the coating object 50. By forming the ridges, it is possible to suppress coating defects caused by the entanglement of the useless air described above. In addition, since the to-be-coated object 50 and the coating roller 2 are moved in opposite directions to each other in a state where the ridges are sufficiently formed, friction can be generated between the to-be-coated object 50 and the coating liquid 30, and the friction The foreign matter adhering to the coating object 50 can be removed. Therefore, the coating failure can be suppressed and the coating liquid 30 can be applied to the object to be coated 50, and foreign matter can also be removed by coating. In the coating device 1 of this embodiment, the tension of the coated object 50 further downstream than the position where the coated liquid 30 is applied in the moving direction of the coated object 50 may be 50 to 1,000. N / m. By setting the tension of the coating object 50 on the downstream side to 50 to 1,000 N / m, it is possible to further suppress the coating liquid 30 from being accompanied by air. Thereby, since the bulge can be formed more sufficiently, it is possible to further suppress the coating failure and further remove the foreign matter. In the coating device 1 of this embodiment, the thickness of the coating object 50 may be 10 to 70 μm. By setting the thickness of the object to be coated to 10 to 70 μm, the air accompanying the coating solution can be further suppressed. Thereby, since the bulge can be formed more sufficiently, it is possible to further suppress the coating failure and further remove the foreign matter. In the coating device 1 of this embodiment, the viscosity of the coating liquid 30 may be 0.5 to 50 mPa · s. By setting the viscosity of the coating liquid 30 to 0.5 to 50 mPa · s, the air accompanying the coating liquid 30 can be further suppressed. Thereby, since the bulge can be formed more sufficiently, it is possible to further suppress the coating failure and further remove the foreign matter. In the coating device 1 of this embodiment, the recessed portion 2a may be formed in a line shape or a honeycomb shape in a manner of 100 to 2500 lines / inch. In the coating device 1 of this embodiment, the thickness of the coating liquid 30 applied to the coating object 50 may be 0.1 to 10 μm. In the coating device 1 of this embodiment, the coating liquid 30 may include an ultraviolet curing resin. The manufacturing method of the coating film 40 according to this embodiment is a method including: a coating step of applying a coating liquid 30 to a relative-moving to-be-coated object 50 and having a recessed portion 2a on the outer peripheral surface. The coating roller 2 rotates so that the outer peripheral surface moves in a direction opposite to the moving direction of the coating object 50, and brings the coating liquid 30 supplied to the recessed portion 2a into contact with the coating object 50, and The coating liquid 30 is applied to the coating object 50 to form a coating film 40. The coating step includes: a supplying step that uses at least the outer peripheral surface of the coating roller 2 having a chamber 3a The supply portion 3 for supplying the coating liquid 30 in the cavity 3a to the recess 2a, and supplying the coating liquid 30 in the cavity 3a to at least the recess 2a on the outer peripheral surface of the coating roller 2; the coating roller The outer diameter of 2 is 60 to 80 mm; the difference V (= Vr-Vm) between the value Vr of the rotation speed of the coating roller 2 and the value Vm of the moving speed of the coated object 50 is set to 0 to 60 m / Minute. According to this configuration, as described above, by setting the outer diameter of the coating roll 2 to 60 to 80 mm, the absolute value Vr of the rotation speed of the coating roll 2 relative to the absolute value Vm of the moving speed of the coating object 50 The difference V is 0 to 60 m / min, and sufficient protrusions of the coating liquid 30 can be formed between the coating roller 2 and the object to be coated 50. By the formation of the protrusions, it is possible to suppress the cause of the useless air described above. Poor coating caused by entanglement. In addition, since the to-be-coated object 50 and the coating roller 2 are moved in opposite directions to each other in a state where the ridges are sufficiently formed, friction can be generated between the to-be-coated object 50 and the coating liquid 30. The foreign matter adhering to the coating object 50 can be removed by rubbing. Therefore, the coating failure can be suppressed and the coating liquid 30 can be applied to the coating object 50, and foreign matter can be removed by coating. As described above, according to the present embodiment, it is possible to provide the coating device 1 and the coating film 40 capable of suppressing poor coating and applying the coating liquid 30 to the object to be coated 50 and removing foreign matter by coating. Of manufacturing method. The manufacturing method of the coating device 1 and the coating film 40 according to this embodiment are as described above, but the present invention is not limited to the above embodiment, and the design can be appropriately changed within the scope intended by the present invention. [Examples] Next, the present invention will be described in detail with examples, but the present invention is not limited to these. Under the conditions shown below, the coating devices of Test Example 1, Test Example 2 and Test Example 3 were operated, and the production method of each coating film was performed. (Experimental example 1) The coating apparatus of the above embodiment was operated, and the coating performance and the removal rate of foreign matter were investigated. The detailed operating conditions during operation are as follows. The thin plate member was coated with an adhesive, and glass beads having a particle diameter of 100 μm as a suspected foreign body were spread, and then the thin plate member was dried and used in a state in which the foreign body adhered. Sheet member: It is a sheet member made of a resin (PET: Polyethylene terephthalate) film (width 0.5 m and thickness 40 μm), that is, the movement of a sheet member to which a suspected foreign body is attached Speed: 20 m / min. The movement direction of the thin plate member and the rotation direction of the coating roller: the opposite direction is the difference between the absolute value of the movement speed of the thin plate member and the rotation speed of the coating roller: -10, 0, 20, 40, 60 , 80 m / min coating roller outer diameter: 50, 60, 80, 90 mm coating roller recess: honeycomb, 1500 lines / inch, 2 mL / m ² coating liquid: ARUFON (propylene polymer product (General name) (40 wt%) Viscosity of coating liquid: 50 mPa · s The coating liquid is circulated by the supply unit (measurement of viscosity). A rheometer (RS1 type, manufactured by HAAKE) is used to shear at 20 ° C. The viscosity of the coating liquid was measured at a speed of 1 (1 / s). (Evaluation of coating performance) The appearance of the coating solution applied to the thin plate member was visually observed, and the case where no streak-like unevenness was considered to be extremely good was indicated as "○", and the streak-like unevenness was partially generated. The uniform condition was regarded as good and indicated as “D”, and the case where the unevenness in the form of stripes as a whole was regarded as bad and indicated as “´”, thereby evaluating the coating performance. The results are shown in FIGS. 4, 5, 6 and 7. (Evaluation of the removal rate of foreign matter) Before the coating liquid is applied to the thin plate member, an area (test area) with a width of 50 mm × a length of 500 mm in the moving direction is taken as a photograph, and the number of suspected foreign matter existing in the area is taken. Perform pre-counting. After the coating liquid is applied to the thin plate member, the number of suspected foreign bodies existing in the above-mentioned test area is counted, and the number of suspected foreign bodies before and after coating is applied to the number of suspected foreign bodies before and after coating according to the following formula The ratio of the difference is calculated as the removal rate of foreign matter. The results are shown in FIGS. 4, 5, 6, and 7. Removal rate of foreign matter = ((Number of suspected foreign matter before coating)-(Number of suspected foreign matter after coating)) / (Number of suspected foreign matter before coating) (Test Example 2) Except using the following operating conditions Other than that, the coating device of the above-mentioned embodiment was operated in the same manner as in Test Example 1, and the coating performance and the removal rate of foreign matter were investigated. The results are shown in FIG. 8. Thin plate member moving speed: 20 m / min The difference between the absolute value of the moving speed of the thin plate member and the rotation speed of the coating roller: 60 m / minute The outer diameter of the coating roller: 60 mm The viscosity of the coating liquid: 0.5, 10, 30, 50, 60, 70 mPa · s (Test Example 3) The coating device of the above embodiment was operated in the same manner as in Test Example 1 except that the following operating conditions were used. At this time, the tension of the sheet member on the downstream side of the coating position in the moving direction of the sheet member is measured, and it is investigated whether the sheet member stably passes the above-mentioned coated position. The results are shown in Figure 1. Thin plate member moving speed: 20 m / min The difference between the absolute value of the moving speed of the thin plate member and the rotation speed of the coating roller: 60 m / minute The outer diameter of the coating roller: 60 mm The viscosity of the coating liquid: 50 mPa · S (Measurement of tension) Using a tension measuring device (LX-100TD, manufactured by Mitsubishi Electric Corporation), the tension of a thin plate member on the downstream side of the coating position in the moving direction of the thin plate member is measured. (Evaluation Criteria) · Generation of wrinkles of thin plate members Visually observe the traveling thin plate members and evaluate whether one or more wrinkles are generated in the direction of travel of the thin plate members. When there are more than one wrinkles, "Yes" is shown in Table 1. In the case where no wrinkles occurred, "None" is shown in Table 1. · Traveling stability of thin plate member Visually observe the running state of the thin plate member during coating, and evaluate whether the thin plate member is meandering or undulating. The case where the thin plate member was not meandering or undulating was evaluated as traveling stability, and it is shown in Table 1 as "stable". In addition, it was evaluated that the operation was unstable, and shown in Table 1 as "unstable". · Tension stability of the thin plate member The tension of the thin plate member on the downstream side is continuously measured (monitored) by using the above-mentioned tension measuring device, and the set value (the values shown in Table 1) is changed relative to the measured tension. When it is less than ± 3 N / m, the tension is estimated to be stable, and it is shown as "stable" in Table 1. On the other hand, when the above-mentioned change is ± 3 N / m or more, the estimated tension is unstable, and it is shown as "unstable" in Table 1. In particular, the above-mentioned change is 150% or more and 150% or more. When the state lasts for more than 3 seconds, the assessment tension is abnormal and is shown as "abnormal" in Table 1. [Table 1] As shown in Figures 5 and 6, when the outer diameter of the coating roller is 60 to 80 mm, and the difference between the rotation speed of the coating roller and the moving speed of the coating roller is 0 to 60 mm / minute, The result was that no streaky coating failure was observed on the coating film and the removal rate of foreign matter was also high. In contrast, as shown in FIG. 4, when the outer diameter of the coating roller is smaller than 60 mm, only when the difference is 0 m / min, no streaky coating failure is observed on the coating film. At the above-mentioned difference of 20 to 80 m / min, poor coating was observed in a part of the coating film that was not coated in a stripe shape. As shown in FIG. 7, when the outer diameter of the coating roller is larger than 80 mm, only when the difference is 0 to 40 m / min, no streaky coating is observed on the coating film. Defective. The above-mentioned difference was 60 to 80 m / min, and a poor coating failure was observed in a part of the coating film that was not coated in a stripe pattern. Therefore, it can be seen that when the outer diameter of the coating roller is 60 to 80 mm, and the difference between the rotation speed of the coating roller and the moving speed of the coating roller is 0 to 60 m / min, it is larger than those outside these ranges. In some cases, both the coating performance and the removal rate of the foreign matter are more excellent. In addition, it is also known that the coating can be performed under a wide range of coating conditions. As shown in FIG. 8, when the viscosity of the coating liquid is 0.5 to 50 mPa · s, both the coating performance and the removal rate of the foreign matter are better than when the viscosity exceeds 50 mPa · s. Can be applied under a wide range of coating conditions. As shown in Table 1, it can be seen that when the coating liquid in the moving direction of the sheet member is applied to the sheet member at a position on the downstream side with a tension of 50 to 1000 N / m, the sheet can be made more than the case outside the range The component is more stable and passes through the above-coated position. In addition, it can be seen that when the thickness of the thin plate member is 5 to 70 μm, the thin plate member can be more stable and pass the above-mentioned coating position than the case outside the range. It can also be seen that when the tension on the downstream side is 50 to 1000 N / m and the thickness of the thin plate member is 5 to 70 μm, the thin plate member can be further stabilized and passed through the coating position. It can also be seen that the tension on the downstream side is 50 to 1000 N / m and the thickness of the thin plate member is 10 to 70 μm, or the tension on the downstream side is 100 to 500 N / m and the thickness of the thin plate member is 5 In the case of ~ 70 μm, the thin plate member can be further stabilized and passed through the above-mentioned coating position. Although the above-mentioned embodiments and examples of the present invention have been described, it is intended that the features of the respective embodiments and examples may be appropriately combined initially. In addition, it should be considered that the embodiments and all points of the embodiments disclosed herein are illustrative and not restrictive. The scope of the present invention is shown by the scope of the patent application rather than the embodiments and examples described above, and is intended to cover all modifications within the meaning and scope equivalent to the scope of the patent application.

1‧‧‧ coating device

2‧‧‧ coating roller

2a‧‧‧ recess

2b‧‧‧ around face

3‧‧‧ Supply Department

3a‧‧‧chamber

3b‧‧‧Inflow path

3c‧‧‧ outflow path

3d‧‧‧Circulation groove

6‧‧‧The first blade member

8‧‧‧ The second blade member

30‧‧‧ coating liquid

40‧‧‧ coated film

50‧‧‧ Coating object (thin plate member)

P‧‧‧Pump

FIG. 1 is a cross-sectional view schematically showing a cross-section of a coating apparatus according to an embodiment of the present invention cut in a direction perpendicular to a rotation axis of a coating roller. FIG. 2 is a cross-sectional view showing an enlarged portion of a recessed portion of a coating roller used in the present embodiment and schematically showing it. FIG. 3 is a diagram schematically showing a state in which air is caught between a coating object and a coating roller. FIG. 4 is a graph showing the relationship between the difference between the rotation speed of the coating roller with respect to the moving speed of the coating object and the removal rate of foreign materials when a coating roller with an outer diameter of 50 mm is used. FIG. 5 is a graph showing the relationship between the difference between the rotation speed of the coating roller with respect to the moving speed of the coating object and the removal rate of foreign materials when a coating roller with an outer diameter of 60 mm is used. FIG. 6 is a graph showing the relationship between the difference between the rotation speed of the coating roller with respect to the moving speed of the coating object and the removal rate of foreign materials when a coating roller with an outer diameter of 80 mm is used. FIG. 7 is a graph showing the relationship between the difference between the rotation speed of the coating roller with respect to the moving speed of the coating object and the removal rate of foreign materials when a coating roller with an outer diameter of 90 mm is used. FIG. 8 is a graph showing the relationship between the viscosity of the coating liquid and the removal rate of foreign matter.

Claims (6)

A coating device includes a coating roller that applies a coating liquid to a person to be coated that moves relatively, and has a concave portion on an outer peripheral surface; and a supply portion that has a cavity and At least the recessed portion on the outer peripheral surface of the coating roller supplies the coating liquid in the chamber; and by rotating the coating roller in such a manner that the outer peripheral surface moves in a direction opposite to the moving direction of the coating object, The coating liquid supplied to the recess is brought into contact with the coating object, and the coating liquid is coated on the coating object to form a coating film; the outer diameter of the coating roller is 60 to 80 mm. The difference between the value of the rotation speed of the coating roller and the value of the movement speed of the coated object is 0 to 60 m / min. The coating device according to claim 1, wherein the tension of the coating object on the downstream side from the position where the coating liquid is applied in the moving direction of the coating object is 50 to 1000 N / m. The coating device according to claim 1, wherein the thickness of the coating object is 10 to 70 μm. The coating device according to claim 2, wherein the thickness of the coating object is 10 to 70 μm. The coating device according to any one of claims 1 to 3, wherein the viscosity of the coating liquid is 0.5 to 50 mPa · s. A method for manufacturing a coating film, comprising: a coating step of applying a coating liquid to a relative moving to-be-coated object and a coating roller having a concave portion on an outer peripheral surface along the outer peripheral surface along the above The coated object is rotated in a direction opposite to the moving direction, and the coating liquid supplied to the recess is brought into contact with the coated object, and the coated liquid is applied to the coated object to form a coating. The film is coated; and the coating step includes: a supplying step that uses a supply unit that has a chamber and supplies the coating liquid in the chamber to at least the recess on the outer peripheral surface of the coating roller, and At least the concave portion of the outer peripheral surface supplies the coating liquid in the cavity; and the outer diameter of the coating roller is 60 to 80 mm; the value of the rotation speed of the coating roller and the movement speed of the coating object are The difference between the values is set to 0 to 60 m / min.