KR102198728B1 - Coating apparatus and method for producing coating film - Google Patents

Abstract

It has a coating roller, a first blade member for rubbing the coating solution to the end, and a second blade member for suppressing leakage of the coating solution, and includes a supply unit for supplying the coating solution to the coating roller, and the axial direction of the coating roller When viewed along, it is a distance along the protruding direction of the second blade member in a state assuming that it is not in pressure contact with the coating roller, and the second blade is greater than the distance between the base end of the second blade member and the coating roller. A coating apparatus in which the length of the member from the base end to the tip end is 0.1 to 5 mm longer.

Description

Coating apparatus and manufacturing method of coating film {COATING APPARATUS AND METHOD FOR PRODUCING COATING FILM}

The present invention relates to a coating apparatus and a method for producing a coating film.

BACKGROUND ART [0002] As a coating apparatus, for example, a gravure coating apparatus provided with a coating roller for coating a coating liquid on an object to be coated, such as a sheet member, has been known.

A gravure coating apparatus of this kind includes a cylindrical coating roller having a concave portion on the outer circumferential surface, and a supply unit for supplying a coating liquid to the outer circumferential surface of the coating roller. The gravure coating apparatus is configured to continuously coat the coating liquid on the object by rotating the coating roller while bringing the coating liquid supplied to the outer peripheral surface of the coating roller into contact with the object to be coated.

In such a gravure coating apparatus, the applied coating liquid enters the concave portion of the outer peripheral surface of the coating roller, and the coating roller rotates while a part of the outer peripheral surface contacts the object to be coated. Thereby, the coating liquid of the outer peripheral part in contact with the object to be coated is applied to the object to be coated. Further, in such a gravure coating apparatus, the coating liquid is transferred from the outer circumferential surface of the coating roller to the object to be coated, and the coating roller rotates. Then, the coating liquid is supplied from the supply unit to the outer circumferential surface in which a void is formed in the concave portion.

As such a coating apparatus, a coating roller and a supply unit for supplying a coating liquid to a concave portion of the coating roller are provided, and the supply unit seals at a downstream side in the rotation direction of the coating roller, and the excess coating liquid adhered to the coating roller It is proposed to have a doctor blade (first blade member) to be rubbed off and a seal plate (second blade member) that seals the coating liquid from the upstream side in the rotation direction of the coating roller (see Patent Document 1).

Japanese Patent Publication No. 2002-186888

However, in the coating apparatus described in Patent Document 1, the coating solution is transferred to the object to be coated in a state in which air is mixed with the coating solution, and there is a fear that coating defects such as mixing of air bubbles may occur, and coating can be performed sufficiently stably. It is difficult to say that you can.

In view of the above circumstances, it is an object of the present invention to provide a coating apparatus and a method for producing a coating film that enable coating of a coating liquid on an object while suppressing coating defects.

In order to solve the above problems, the present inventors intensively studied, and found the following knowledge.

In other words, it was found that air is mixed into the coating solution as air bubbles at the position where the coating roller and the second blade member preventing leakage of the coating solution from the supply unit are in contact. Further, it was found that the length of the portion where the second blade member protrudes from the chamber of the supply unit is related as the cause of the air bubbles mixed in the coating liquid in this way.

In addition, a thorough study was conducted on the cause of this, when viewed along the axial direction of the coating roller, the second blade along the protruding direction of the second blade member in a state that is not in pressure contact with the coating roller (that is, in a natural state). By setting the length from the base end to the tip end of the second blade member to 0.1 to 5 mm longer than the distance between the base end of the member and the coating roller, the second blade on the upstream side in the rotation direction of the coating roller in the supply unit It has been found that mixing of air bubbles into the coating liquid can be suppressed from between the member and the coating roller.

And, by setting in this way, it was found that air bubbles can be suppressed from mixing in the coating liquid on the upstream side in the rotational direction of the coating roller, thereby suppressing the defect of the coating film after coating, and the present invention was completed.

That is, the coating apparatus according to the present invention,

A coating roller that applies a coating solution to a relatively moving object, and has a concave portion on the outer circumferential surface;

A supply unit having a chamber and supplying the coating liquid in the chamber to at least the concave portion of the outer peripheral surface of the coating roller,

While rotating the coating roller, by contacting the coating liquid supplied to the concave portion with the object to be coated, the coating liquid is applied to the object to form a coating film,

The supply unit includes a first blade member protruding from the chamber toward the outer circumferential surface of the coating roller to rub the coating liquid and press-contacting the coating roller, and a rotational direction upstream of the coating roller than the first blade member. And a second blade member protruding from the chamber toward the outer peripheral surface of the coating roller so as to suppress leakage of the coating liquid in pressure contact with the coating roller,

A distance along the protruding direction of the second blade member when viewed along the axial direction of the coating roller, assuming that it is not in pressure contact with the coating roller, and the distance between the base end of the second blade member and the coating roller Rather, the length from the base end to the tip end of the second blade member is formed to be 0.1 to 5 mm longer.

In the coating apparatus of the above configuration,

It may be configured such that the uppermost portion of the coating liquid in the chamber is positioned higher than the contact portion between the first blade member and the coating roller.

The method for producing a coating film of the present invention,

A coating roller that applies a coating liquid to a relatively moving object, and rotates the coating roller having a concave portion on an outer circumferential surface, and makes the coating liquid supplied to the concave portion contact the object to be coated. It is provided with a coating process of forming a coating film by coating the object to be coated,

The coating process,

Supply for supplying the coating liquid in the chamber to at least the concave portion of the outer circumferential surface of the coating roller using a supply unit having a chamber and supplying the coating liquid in the chamber to at least the concave portion of the outer peripheral surface of the coating roller Have a fair,

The supply unit includes a first blade member protruding from the chamber toward the outer circumferential surface of the coating roller to rub the coating liquid and press-contacting the coating roller, and a rotational direction upstream of the coating roller than the first blade member. Further comprising a second blade member protruding from the chamber toward the outer peripheral surface of the coating roller so as to suppress leakage of the coating liquid in pressure contact with the coating roller,

A distance along the protruding direction of the second blade member when viewed along the axial direction of the coating roller, assuming that it is not in pressure contact with the coating roller, and the distance between the base end of the second blade member and the coating roller Rather, it is a method of increasing the length from the base end to the tip end of the second blade member by 0.1 to 5 mm.

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 sectional view schematically showing a partially enlarged concave portion of the coating roller used in the present embodiment.
Fig. 3 is a cross-sectional view schematically showing a relationship between a first blade member used in the present embodiment and a liquid level of a coating liquid in a chamber.
4 is a cross-sectional view schematically showing a positional relationship between a second blade member and a coating roller used in the present embodiment.
Fig. 5 is a cross-sectional view schematically showing a state in which a second blade member used in the present embodiment is not pressed against a coating roller.
6 is a graph showing the results of Test Example 1.
7 is a graph showing the results of Test Example 2.

Hereinafter, a coating apparatus according to an embodiment of the present invention will be described with reference to the drawings. In this embodiment, an example in which the sheet member 50 is employed as the object 50 to be coated will be described, but the object 50 to be coated is not limited to the sheet member 50.

The coating apparatus 1 of this embodiment is a coating roller 2 for coating a coating liquid 30 on a relatively moving object 50, as shown in FIGS. 1 to 5, and on the outer circumferential surface. A coating roller 2 having a concave portion 2a, and a supply portion 3 having a chamber and supplying the coating liquid 30 in the chamber to at least the concave portion 2a of the outer peripheral surface of the coating roller 2 are provided.

In the coating apparatus 1 of this embodiment, the coating liquid 30 is brought into contact with the object 50 by contacting the coating liquid 30 supplied to the concave portion 2a while rotating the coating roller 2. It is configured to apply to the object 50 to be coated. The coating apparatus 1 provided with the coating roller 2 as described above is generally referred to as a gravure coating apparatus.

In the coating apparatus 1 of the present embodiment, the supply unit 3 protrudes from the chamber 3a toward the outer peripheral surface of the coating roller 2 so as to rub the coating liquid 30, and is pressed against the coating roller 2 The coating roller 2 from the chamber 3a so as to suppress the leakage of the coating liquid 30 on the upstream side of the rotational direction of the coating roller 2 than the first blade member 6 and the first blade member 6. A second blade member 8 protruding toward the outer circumferential surface of) and further press-contacted the coating roller 2 is provided.

In the coating apparatus 1 of this embodiment, when viewed along the axial direction of the coating roller 2, the protruding direction of the second blade member 8 in the state assuming that it is not in pressure contact with the coating roller 2 It is a distance according to the distance between the base end 8a of the second blade member 8 and the coating roller 2, and the length from the base end 8a to the tip end 8b of the second blade member 8 is, It is composed of 0.1 to 5 mm long.

In the coating apparatus 1 of the present embodiment, the coating liquid 30 is supplied to the outer circumferential surface of the coating roller 2 from the supply unit 3, and the coating outside the concave portion 2a among the coating liquid 30 supplied to the outer circumferential surface It is configured to remove the liquid 30 by the first blade member 6. Moreover, the coating apparatus 1 of this embodiment is comprised so that the sheet member 50 may be moved relatively to the supply part 3 in a predetermined direction. In addition, in the coating apparatus 1 of this embodiment, a part of the coating liquid 30 supplied to the outer circumferential surface of the coating roller 2 while rotating the coating roller 2 in one direction is transferred to the object to be coated 50. It is comprised so that the coating liquid 30 in the recessed part 2a may be continuously coated on the sheet member 50 while contacting the sheet member 50 as a sheet member 50. Moreover, the rotation direction of the coating roller 2 (that is, the movement direction of the outer peripheral surface of the coating roller 2) and the movement direction of the sheet member 50 are comprised so that it may become opposite from the coating part.

The coating liquid 30 is usually coated on the sheet member 50 and then solidified on the sheet member 50 to form a coating film 40. As the coating liquid 30, a solution containing a cured polymer material is exemplified. Examples of the curable polymer material include a thermosetting material, an ultraviolet curable material, and an electron beam curable material. Among these, the polymer material is preferably an ultraviolet curable material.

In addition, coating includes printing and coating.

The viscosity of the coating liquid 30 is not particularly limited, but 0.5 to 100 mPa·s is preferable, and 10 to 50 mPa·s is more preferable.

In addition, the viscosity of the coating liquid 30 is a value measured under conditions of a shear rate of 1 (1/s) at 20°C using a rheometer (model RS1, manufactured by HAAKE).

The sheet member 50 is usually formed in a belt shape. As the sheet member 50, a resin film is mentioned, for example.

The width of the sheet member 50 is usually shorter than the length of the coating roller 2 in the rotation axis direction.

The thickness of the sheet member 50 is not particularly limited, but is, for example, about 5 to 80 µm, 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 cylinder shaft as a rotation shaft.

The coating roller 2 is arranged so that a part of the coating liquid 30 supplied to the outer peripheral surface comes into contact with a part of the sheet member 50. And the coating roller 2 is comprised so that the coating liquid on the outer peripheral surface may contact the sheet member 50 along the circumferential direction by rotating at least one.

As shown in Fig. 2, the outer circumferential surface of the coating roller 2 is a peripheral surface portion 2b and a peripheral surface portion 2b arranged along the cylinder as viewed from one side of the cylindrical coating roller 2 in the axial direction of the cylinder. It has a concave portion 2a concave inwardly than that.

A plurality of the concave portions 2a are formed on the outer peripheral surface of the coating roller 2. In addition, a large number of recesses 2a are formed over the entire outer peripheral surface of the coating roller 2.

In the coating apparatus 1 of this embodiment, the shape of the recessed part 2a is not specifically limited, For example, it may be formed in a line shape. As the concave portion 2a formed in a linear shape, a honeycomb concave portion 2a formed by a plurality of linear grooves intersecting each other, or a plurality of linear grooves not intersecting each other (for example, parallel) The recessed part 2a, etc. are mentioned.

Further, such a linear concave portion 2a may be formed to be 100 to 2500 lines/inch.

The outer diameter of the coating roller 2 is not particularly limited, but is, for example, 60 to 120 mm. In addition, such an outer diameter is the diameter of the outermost periphery of the coating roller 2.

The outer diameter rotational speed of the coating roller 2 is not particularly limited, but is, for example, 10 to 150 m/min. In addition, this rotational speed is the moving speed (peripheral speed) of the outer peripheral surface of the coating roller 2.

The length (width) in the longitudinal direction of the coating roller 2 is not particularly limited, but is, for example, 500 to 2500 mm.

The moving speed of the sheet member 50 is not particularly limited, but is, for example, 5 to 100 m/min.

The coating apparatus 1 of this embodiment is configured such that the sheet member 50 is pressed against the outer peripheral surface of the coating roller 2.

In the coating apparatus 1 of this embodiment, the tension of the sheet member 50 is not specifically limited. For example, the tension of the sheet member on the downstream side of the position at which the coating liquid 30 in the moving direction of the sheet member 50 is coated is preferably 50 to 1000 N/m, and 100 to 500 N/m. It is more preferable.

The supply unit 3 includes a chamber 3a for supplying the coating liquid 30 stored therein to the outer circumferential surface of the coating roller 2, and an inflow path 3b for introducing the coating liquid 30 into the chamber 3a. Wow, a circulation tank for circulating by sending the coating liquid 30 flowing out of the chamber 3a to the outflow path 3c and the coating liquid 30 flowing out through the outflow path 3c to the inflow path 3b Has (3d).

The chamber 3a is configured to supply the coating liquid 30 to the outer peripheral surface of the coating roller 2.

The chamber 3a is formed in a hollow shape in which the supply destination side of the coating liquid 30 is opened. The chamber 3a is configured to supply the coating solution 30 to the outer peripheral surface of the coating roller 2 from the opening while filling the inner space with the coating solution 30. That is, the chamber 3a is generally referred to as a closed chamber.

The chamber 3a is disposed in front of the portion where the coating liquid 30 is applied to the sheet member 50. In addition, the chamber 3a is arranged so that the above-described opening is along the outer peripheral surface of the coating roller 2.

The chamber 3a is configured to collect the coating liquid 30 flowing in from the inflow path 3b. Further, the chamber 3a has a second blade member 8 at a portion close to the outer peripheral surface of the coating roller 2 so that the coating liquid 30 does not leak. The chamber 3a is configured to supply a part of the coating liquid 30 stored therein to the outer peripheral surface of the coating roller 2 while suppressing the leakage of the coating liquid 30 by the second blade member 8 Has been.

One side of the inflow path 3b is connected to the circulation tank 3d, and the other side is connected to the chamber 3a. The inflow path 3b has a pump 4 for sending the coating liquid 30. The inflow path 3b is configured to send the coating liquid 30 supplied by the pump 4 from the circulation tank 3d to the chamber 3a.

As the pump 4, a conventionally known pump such as a gear pump, a diaphragm pump, a plunger pump, and a snake pump can be mentioned, for example.

In the outflow path 3c, one side is connected to the chamber 3a, and the other side is connected to the circulation tank 3d. The outflow path 3c is configured to send the coating liquid 30 from the chamber 3a to the circulation tank 3d.

The circulation tank 3d is configured to temporarily collect the coating liquid 30 sent via the outflow path 3c.

The supply unit 3 is configured to collect the coating liquid 30 flowing in from the inflow path 3b into the chamber 3a, and supply a part of the collected coating liquid 30 to the outer peripheral surface of the coating roller 2 . In addition, the supply unit 3 is configured to send the coating liquid 30 not supplied from the chamber 3a to the outer circumferential surface of the coating roller 2 to the circulation tank 3d through the outflow path 3c. have. In this way, the supply unit 3 is configured to supply a part of the coating solution 30 circulating while circulating the coating solution 30 to the outer peripheral surface of the coating roller 2.

The first blade member 6 is a concave portion of the coating liquid 30 supplied to the outer peripheral surface of the coating roller 2 while sealing the downstream side in the rotation direction of the coating roller 2 in the supply unit 3 2a) It is comprised so that the outer coating liquid 30 may be removed.

The 1st blade member 6 is arrange|positioned on the most downstream side of the chamber 3a in the rotation direction of the coating roller 2, and is press-contacted with the coating roller 2. The first blade member 6 is usually formed in a plate shape. The 1st blade member 6 is arrange|positioned so that at least a part may contact the peripheral surface part 2b of the outer peripheral surface of the coating roller 2.

The 1st blade member 6 removes the coating liquid 30 attached to the peripheral surface part 2b of the outer peripheral surface of the coating roller 2 from the said contact part P, and coats in the recessed part 2a It is configured to leave the liquid 30.

As the 1st blade member 6, a doctor blade is mentioned, for example.

The first blade member 6 is formed of a metal material such as stainless steel, for example.

The first blade member 6 is fixed to the chamber 3a by a fixing member 61 such as a screw.

As shown in Fig. 3, the first blade member 6 is an inclination angle θ1 with respect to the direction in which the tangent line to the coating roller 2 in the contact portion P of the coating roller 2 extends. It is press-contacted with respect to the coating roller 2 so that this may become 0 to 45 degrees.

In the present embodiment, the uppermost portion of the coating liquid 30 in the chamber 3a (here, the liquid level of the coating liquid 30) 30a than the contact portion P between the first blade member 6 and the coating roller 2 ) Is configured to be positioned high. That is, the position of the uppermost part 30a of the coating liquid 30 in the chamber 3a (the uppermost part with respect to the contact part P) than the contact part P between the first blade member 6 and the coating roller 2 It is configured so that the side of the height (d)) of 30a) is positioned upward.

If the arrangement of the first blade member 6 is an arrangement in which the uppermost portion 30a of the coating liquid 30 is higher than the contact portion P of the first blade member 6 and the coating roller 2, It is not particularly limited. For example, the 1st blade member 6 is arrange|positioned so that the height d of the uppermost part 30a of the coating liquid 30 with respect to the said contact part P exceeds 0 mm and becomes 10 mm or less. It is desirable.

The thickness of the first blade member 6 is preferably 0.1 to 1 mm, more preferably 0.1 to 0.5 mm.

The 2nd blade member 8 is comprised so that the coating liquid 30 may not leak from the supply part 3 so that it may seal.

The 2nd blade member 8 is arrange|positioned at the most upstream side of the chamber 3a in the rotation direction of the coating roller 2, and is press-contacted with the coating roller 2. That is, it is arrange|positioned upstream in the rotational direction of the coating roller 2 rather than the 1st blade member 6. Further, the second blade member 8 is disposed below the first blade member 6. That is, it is comprised so that the coating liquid 30 may move upward in the chamber 3a.

The second blade member 8 is fixed to the chamber 3a by a fixing member 81 such as a screw.

The second blade member 8 is formed of, for example, a resin material such as polyethylene terephthalate (PET) and polyester (PEs).

In the coating apparatus 1 of the present embodiment, as shown in FIGS. 4 and 5, the second blade member 8 is a second blade member in a state assuming that it is not in pressure contact with the coating roller 2. A virtual straight line (N) along the protruding direction of (8) (refer to the white arrow in Fig. 4), and a virtual tangent to the outer circumferential surface through the intersection of the virtual straight line (N) and the outer circumferential surface of the coating roller (2) It is press-contacted to the coating roller 2 so that the inclination angle θ2 formed with the chin is 0 to 90°.

The thickness of the second blade member 8 is preferably 0.1 to 1 mm, more preferably 0.1 to 0.5 mm.

4 and 5, when viewed along the axial direction of the coating roller 2, the protruding direction of the second blade member 8 in a state assuming that it is not in pressure contact with the coating roller 2 It is a distance from the base end 8a of the second blade member 8 to the tip 8b than the distance L (mm) between the base end 8a of the second blade member 8 and the coating roller 2 The length (W) (mm) of is formed to be 0.1 to 5 mm longer. That is, the difference E between the length W with respect to the distance L is configured to be 0.1 to 5 mm (W-L=E).

The distance L is, for example, 10 to 50 mm.

As shown in Figs. 4 and 5, the distance L is the second blade member according to the protruding direction of the second blade member 8 in the state that it is not in pressure contact with the coating roller 2 It corresponds to the shortest distance connecting the base end 8a of (8) (that is, the root of the second blade member) and the coating roller 2. In other words, the distance L is the base end 8a of the second blade member 8 according to the protruding direction of the second blade member 8 in the state that it is not in pressure contact with the coating roller 2. When the virtual straight line N is extended from) toward the coating roller 2, the virtual straight line N corresponds to the distance from the base end 8a to the coating roller 2.

As shown in Fig. 5, the length W protrudes from the chamber 3a of the second blade member 8 in a state that it is assumed that the second blade member 8 is not in pressure contact with the coating roller. Corresponds to the length of the part.

In the present embodiment, the length W is 0.1 to 5 mm longer than the distance L, and 0.1 to 3 mm is preferably longer.

In the coating apparatus 1 of the present embodiment, the coating liquid 30 remaining in the concave portion 2a of the outer peripheral surface of the coating roller 2 is transferred to the sheet member 50 by the first blade member 6. By doing so, it is comprised so that coating may be performed and the coating film 40 may be formed.

In the coating apparatus 1 of the present embodiment, the thickness of the coating liquid 30 applied to the sheet member 50 may be 0.1 to 10 µm.

Next, an embodiment of a method for producing a coated film of 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 manufacturing method of the coating film 40 of this embodiment,

It is a coating roller (2) that applies a coating solution (30) to a relatively moving object (50), while rotating the coating roller (2) having a concave portion (2a) on the outer circumferential surface, the concave portion (2a) A coating process is provided for forming a coating film 40 by applying the coating solution 30 to the object 50 by contacting the coating solution 30 supplied to the object 50 to be coated. .

The coating process uses a supply unit 3 that has a chamber 3a and supplies the coating liquid 30 in the chamber 3a to at least the concave portion 2a of the outer circumferential surface of the coating roller 2, , A supply step of supplying the coating liquid 30 in the chamber 3a to at least the concave portion 2a of the outer peripheral surface of the coating roller 2.

The supply part 3 is a first blade member protruding from the chamber 3a toward the outer circumferential surface of the coating roller 2 so as to rub the coating liquid 30 and being in pressure contact with the coating roller 2 ( 6) and the outer circumferential surface of the coating roller 2 from the chamber 3a so as to suppress the leakage of the coating liquid 30 on the upstream side in the rotational direction of the coating roller 2 than the first blade member 6 It further includes a second blade member 8 protruding toward and pressed against the coating roller 2.

In the manufacturing method of the coating film 40 of this embodiment, the 2nd blade member 8 in the state assuming that it is not in pressure contact with the coating roller 2 when viewed along the axial direction of the coating roller 2 It is the distance along the protruding direction of the second blade member 8 and the length from the base end 8a of the second blade member 8 to the tip end 8b than the distance between the base end 8a of the second blade member 8 and the coating roller 2 The side is lengthened by 0.1 to 5 mm.

Moreover, in the manufacturing method of the coating film 40 of this embodiment, the coating liquid 30 in the said chamber 3a is more than the contact part P of the said 1st blade member 6 and the said coating roller 2 ) Is configured so that the side of the uppermost portion 30a is located higher.

In the coating process, the coating solution 30 is applied to the concave portion 2a of the outer circumferential surface of the coating roller 2 while circulating the coating solution 30 as described above by, for example, the supply unit 3 described above. Supply.

As the coating solution 30 is supplied in this way, the coating roller 2 rotates, so that the coating solution 30 supplied to the concave portion 2a of the outer circumferential surface of the coating roller 2 is applied to the object 50 do. That is, the coating liquid 30 in the concave portion 2a is transferred by contacting the object 50 to be coated, so that the coating film 40 is formed.

As described above, the coating apparatus 1 of the present embodiment,

A coating roller 2 for coating a coating liquid 30 on a relatively moving object 50, and a coating roller 2 having a concave portion 2a on the outer circumferential surface thereof,

It has a chamber and is provided with a supply part 3 for supplying the coating liquid 30 in the chamber to at least the concave part 2a of the outer peripheral surface of the coating roller 2,

While rotating the coating roller 2, the coating solution 30 supplied to the concave portion 2a is brought into contact with the object 50 to apply the coating solution 30 to the object 50 to be coated. Is configured to form 40,

The supply unit 3 has a first blade member 6 protruding from the chamber 3a toward the outer circumferential surface of the coating roller 2 so as to rub the coating liquid 30 and press-contacting the coating roller 2, the corresponding The coating roller 2 protrudes from the chamber 3a toward the outer peripheral surface of the coating roller 2 so as to suppress leakage of the coating liquid 30 from the first blade member 6 on the upstream side in the rotational direction of the coating roller 2. ) Further provided with a second blade member (8) in pressure contact,

When viewed along the axial direction of the coating roller 2, it is a distance along the protruding direction of the second blade member 8 in the state that it is not in pressure contact with the coating roller 2, and The length from the base end 8a to the tip end 8b of the second blade member 8 is 0.1 to 5 mm longer than the distance between the base end 8a and the coating roller 2.

According to this configuration, from the base end 8a of the second blade member 8 to the tip 8b than the distance L between the base end 8a of the second blade member 8 and the coating roller 2 The length (W) of 0.1 to 5 mm is longer, so that between the second blade member 8 and the coating roller 2 on the upstream side in the rotational direction of the coating roller 2 in the supply section 3 It is possible to suppress mixing of air bubbles into the coating liquid 30.

In this way, on the side where the coating roller 2 enters the supply portion 3, it is possible to suppress mixing of air bubbles into the coating liquid 30.

Therefore, it becomes possible to apply the coating liquid 30 to the object 50 while suppressing the coating defect.

In the coating apparatus 1 of this embodiment,

It is configured so that the uppermost portion 30a of the coating liquid 30 in the chamber 3a is positioned higher than the contact portion between the first blade member 6 and the coating roller 2.

Here, the present inventors, in addition to the above-described knowledge, at a position where the first blade member 6 and the coating roller 2 are in contact, the coating on the coating roller 2 after passing the first blade member 6 It was also found that air is mixed into the liquid 30 as bubbles. In addition, as a cause of mixing of air bubbles in the coating liquid 30 on the coating roller 2 after passing the first blade member 6 in this way, the contact portion between the first blade member 6 and the coating roller 2 It was also found out that the height of the surface of the coating liquid 30 (that is, the uppermost portion 30a) in the chamber 3 with respect to (P) is related.

Then, by setting the uppermost portion 30a of the coating liquid 30 in the chamber 3 to be higher than the contact portion P between the first blade member 6 and the coating roller 2, the coating roller 2 The coating liquid 30 on the coating roller 2 after passing the first blade member 6 between the first blade member 6 and the coating roller 2 on the downstream side in the rotational direction of It was also found that air bubbles can be prevented from being mixed in the coating solution 30) immediately before transfer to )).

In this way, in addition to the fact that the protruding length W of the second blade member 8 is 0.1 to 5 mm longer than the distance L connected to the shortest, the first blade member 6 and the coating roller By setting the uppermost part 30a of the coating liquid 30 in the chamber 3 higher than the contact part P of (2), the coating liquid 30 is not only on the upstream side in the rotation direction of the coating roller 2 but also on the downstream side. It was also found that air bubbles can be prevented from entering.

That is, according to this configuration, the uppermost portion 30a of the coating liquid 30 in the chamber 3a is positioned higher than the contact portion P between the first blade member 6 and the coating roller 2, It is possible to suppress air bubbles from entering the coating liquid 30 on the coating roller 2 after passing the first blade member 6 through the first blade member 6 on the downstream side in the rotation direction of the coating roller 2 in the supply unit 3 .

Thereby, it is possible to suppress mixing of air bubbles into the coating liquid 30 on the side where the coating roller 2 comes out compared to the supply unit 3.

In other words, it is possible to suppress mixing of air bubbles into the coating liquid 30 on both the side where the coating roller 2 enters and the side where the coating roller 2 enters compared to the supply unit 3.

Therefore, it becomes possible to apply the coating liquid 30 to the object 50 while suppressing the coating defect more.

In the coating apparatus 1 of this embodiment,

The viscosity of the coating liquid 30 may be 0.5 to 100 mPa·s.

In the coating apparatus 1 of this embodiment,

The coating liquid 30 may contain an ultraviolet curing resin.

The manufacturing method of the coating film 40 of this embodiment,

It is a coating roller (2) that applies a coating solution (30) to a relatively moving object (50), while rotating the coating roller (2) having a concave (2a) on the outer circumferential surface, the concave (2a) A coating process of forming a coating film 40 by applying the coating solution 30 to the coating 50 by contacting the coating solution 30 supplied to the coating material 50 is provided, ,

The coating process,

A supply part 3 having a chamber 3a and supplying the coating liquid 30 in the chamber 3a to at least the concave part 2a of the outer circumferential surface of the coating roller 2 is used, and the coating roller ( 2) has a supply step of supplying the coating liquid 30 in the chamber 3a to at least the concave portion 2a of the outer peripheral surface,

The supply part 3 is a first blade member protruding from the chamber 3a toward the outer circumferential surface of the coating roller 2 so as to rub the coating liquid 30 and being in pressure contact with the coating roller 2 ( 6) and protruding toward the outer circumferential surface of the coating roller 2 from the chamber 3a so as to suppress leakage of the coating liquid 30 from the upstream side in the rotational direction of the coating roller 2 than the first blade member 6 And further provided with a second blade member 8 pressed against the coating roller 2,

When viewed along the axial direction of the coating roller 2, it is a distance along the protruding direction of the second blade member 8 in the state that it is not in pressure contact with the coating roller 2, and This is a method in which the length from the base end 8a to the tip end 8b of the second blade member 8 is 0.1 to 5 mm longer than the distance between the base end 8a and the coating roller 2.

According to such a configuration, as described above, on the side where the coating roller 2 enters the supply portion 3, it is possible to suppress mixing of air bubbles into the coating liquid 30.

Therefore, it becomes possible to apply the coating liquid 30 to the object 50 while suppressing the coating defect.

As described above, according to the present embodiment, a coating apparatus 1 and a method for manufacturing a coating film 40 that enable coating of the coating liquid 30 on the object 50 while suppressing coating defects are provided. do.

The method of manufacturing the coating apparatus 1 and the coating film 40 of the present embodiment is the same as described above, but the present invention is not limited to the above embodiment, and the design can be appropriately changed within the intended range of the present invention. .

Example

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

Under the conditions shown below, the coating apparatus of Test Example 1 was operated to perform a method for producing a coated film.

(Test Example 1)

Coating performance was investigated by operating the coating apparatus of the above embodiment and measuring the number of defects in the coating liquid (coating film) applied on the sheet. In addition, detailed operation conditions at the time of operation are as follows.

Seat member movement speed: 20 m/min

Movement direction of sheet member and rotation direction of coating roller: opposite direction

Peripheral rotation speed ratio of the coating roller (moving speed of the pair of sheet members): 1.6

Concave part of coating roller: Honeycomb shape, 1500 lines/inch, 2mL/㎡

Coating liquid: Alphon (40wt%)

Viscosity of coating liquid: 40mPa·s

Circulate the coating liquid in the supply section

1st blade member (material: stainless steel, thickness: 0.2mm)

Second blade member (material: resin (plastic), thickness: 0.2 mm)

The difference (W-L) of the length (W) with respect to the distance (L) for the second blade member: 0mm, 0.1mm, 0.3mm, 1mm, 3mm, 5mm, 8mm, L=20mm

The position (height) of the liquid surface with respect to the contact portion between the first blade member and the coating roller d: -2mm, 0mm, 2mm, 10mm

(Measurement of viscosity)

Using a rheometer (model RS1, manufactured by HAAKE), the viscosity of the coating solution was measured at 20°C under conditions of a shear rate of 1 (1/s).

(Coating performance)

The appearance of the coating liquid applied to the sheet member was observed with a camera having a resolution of 35 µm, and the number of streaks and unevenness was counted in a range of 30 mm in width x 100 m in length to evaluate coating performance. The results are shown in Table 1 and Fig. 6.

As shown in Table 1 and Fig. 6, when the difference (W-L) of the length (W) to the distance (L) is 0.1 to 5 mm, the number of defects is smaller than that outside the range. On the other hand, when the difference W-L was 0 mm, the coating liquid leaked and coating could not be performed.

It was found that this tendency can appear regardless of the height d of the uppermost part of the coating liquid (here, the liquid level) in the chamber with respect to the contact portion between the first blade member and the coating roller.

In addition, when the height (d) is 2 mm than when the height (d) is 0 mm (when the heights of the two are the same) and when it is -2 mm (when the uppermost part of the coating solution is lower) It can be seen that the number of defects decreases in the case of (when the uppermost part of the coating solution is higher).

(Test Example 2)

The material of the second blade member was changed to 0.4 mm while the height (d) of the liquid level was set to -2 mm, and the thickness of the second blade member was set to 0.2 mm, and the height of the liquid level. The coating performance was evaluated in the same manner as in Test Example 1 except that the material was changed to stainless steel while being set to -2 mm. The results are shown in Table 2 and Fig. 7.

In addition, in Table 2 and Fig. 7, the results (Table 1) when the height d of the liquid level is set to -2 mm and the thickness is set to 0.2 mm in Test Example 1 are also shown.

As shown in Table 2 and FIG. 7, when the material of the second blade member is resin (plastic), the difference in the number of defects due to the difference in thickness could not be confirmed.

On the other hand, when the material of the second blade member is stainless steel, since the second blade member is not sufficiently bent, it is not sufficiently pressure-contacted to the coating roller, so bubbles enter the chamber, and the coating liquid (coating film) is disadvantageous. The number has increased.

As described above, the embodiments and examples of the present invention have been described, but it is also planned from the beginning to appropriately combine the features of the embodiments and examples. In addition, it should be considered that the embodiment and the Example disclosed this time are an illustration in all points and are not restrictive. The scope of the present invention is indicated by the claims rather than the above-described embodiments and examples, and it is intended that the meaning of the claims and the equivalents and all changes within the scope are included.

1: Potter device
2: coating roller
2a: recess
2b: peripheral surface
3: supply
3a: chamber
3b: funnel
3c: outflow path
3d: circulation tank
6: first blade member (doctor blade)
8: second blade member
30: coating liquid
30a: top
50: object to be coated (sheet member)

Claims (3)

A coating roller that applies a coating solution to a relatively moving object, and has a concave portion on the outer circumferential surface;
A supply unit having a chamber and supplying the coating liquid in the chamber to at least the concave portion of the outer peripheral surface of the coating roller,
The coating liquid supplied to the concave portion is brought into contact with the object while rotating the coating roller, so that the coating liquid is applied to the object to form a coating film,
The supply unit includes a first blade member protruding from the chamber toward the outer circumferential surface of the coating roller to rub the coating liquid and press-contacting the coating roller, and a rotational direction upstream of the coating roller than the first blade member. Further comprising a second blade member protruding from the chamber toward the outer peripheral surface of the coating roller so as to suppress leakage of the coating liquid in pressure contact with the coating roller,
A distance along the protruding direction of the second blade member when viewed along the axial direction of the coating roller, assuming that it is not in pressure contact with the coating roller, and the distance between the base end of the second blade member and the coating roller Rather, a coating apparatus in which the length of the second blade member from the base end to the tip end is 0.1 to 5 mm longer. The coating apparatus according to claim 1, wherein the uppermost portion of the coating liquid in the chamber is positioned higher than a contact portion between the first blade member and the coating roller. A coating roller that applies a coating liquid to a relatively moving object, and rotates the coating roller having a concave portion on an outer circumferential surface, and makes the coating liquid supplied to the concave portion contact the object to be coated. It has a coating process of forming a coating film by coating the object to be coated,
The coating process,
Supply for supplying the coating liquid in the chamber to at least the concave portion of the outer circumferential surface of the coating roller using a supply unit having a chamber and supplying the coating liquid in the chamber to at least the concave portion of the outer circumferential surface of the coating roller Have a fair,
The supply unit includes a first blade member protruding from the chamber toward the outer circumferential surface of the coating roller to rub the coating liquid and press-contacting the coating roller, and a rotational direction upstream of the coating roller than the first blade member. Further comprising a second blade member protruding from the chamber toward the outer peripheral surface of the coating roller so as to suppress leakage of the coating liquid in pressure contact with the coating roller,
A distance along the protruding direction of the second blade member when viewed along the axial direction of the coating roller, assuming that it is not in pressure contact with the coating roller, and the distance between the base end of the second blade member and the coating roller Rather, the length of the second blade member from the proximal end to the distal end is increased by 0.1 to 5 mm.

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