KR102431647B1 - Coating apparatus and method for producing coating film - Google Patents

Abstract

A coating roller having a concave portion on its outer circumferential surface, and a supply unit for supplying the coating solution to the outer circumferential surface of the coating roller, rotating the coating roller so that the outer circumferential surface moves in a direction opposite to the moving direction of the object to be coated, by bringing the coating liquid supplied to the recessed portion into contact with the object to be coated, so as to apply the coating liquid to the object to form a coating film, wherein the outer diameter of the coating roller is 60 to 80 mm, and the The coating apparatus of which the difference between the value of the rotational speed and the value of the moving speed of the said to-be-coated object is 0-60 m/min.

Description

A coating apparatus and the manufacturing method of a coating film TECHNICAL FIELD

This invention relates to a coating apparatus and the manufacturing method of a coating film.

DESCRIPTION OF RELATED ART As a coating apparatus, the gravure coating apparatus provided with the coating roller which coats a coating liquid to to-be-coated objects, such as a sheet member, for example, and forms a coating film is known as a coating apparatus conventionally.

This type of gravure coating apparatus is provided with a cylindrical coating roller having a concave portion on its outer peripheral surface, and a supply unit for supplying a coating solution to the outer peripheral surface of the coating roller. The gravure coating apparatus is configured to continuously apply the coating liquid to 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 supplied coating liquid enters the recessed part of the outer peripheral surface of a coating roller, and a coating roller rotates while a part of an outer peripheral surface comes into contact with a to-be-coated object. Thereby, the coating liquid of the outer peripheral part which contacted the to-be-coated object is coated to a to-be-coated object. Moreover, in such a gravure coating apparatus, a coating liquid is transferred to a to-be-coated object from the outer peripheral surface of a coating roller, and it is coated, and also the coating roller rotates. And the coating liquid is supplied from the supply part to the outer peripheral surface in which the space|gap was created in the recessed part.

As such a coating apparatus, the thing provided with the coating roller which has an outer diameter of 45-150 mm is proposed. According to such a coating apparatus, as the outer diameter of a coating roller is small, the time during which the coating liquid is exposed to the outside air between when the coating liquid is supplied to the recessed part of the coating roller until it is transcribe|transferred to a to-be-coated object becomes short. Thereby, even when the coating liquid which is easy to dry is used, it becomes possible to suppress the fall of coating performance (refer patent document 1).

Further, as the above coating apparatus, a coating roller having an outer diameter of 40 to 55 mm, and a supply unit for supplying a coating liquid to a recessed portion of the coating roller are provided, and the supply unit is configured to apply the coating from the downstream side in the rotation direction of the coating roller It has been proposed to have a doctor blade that removes excess coating liquid adhering to the coating roller while sealing the liquid, and a seal plate that seals the coating liquid on the upstream side in the rotational direction of the coating roller. According to such a coating apparatus, even if the outer diameter of a coating roller is small, it becomes possible to apply a coating liquid to a to-be-coated object uniformly by a coating roller (refer patent document 2).

Japanese Patent Laid-Open No. 2014-226637 Japanese Patent Laid-Open No. 2002-186888

However, in the coating apparatus described in Patent Documents 1 and 2, coating defects such as streaks and unevenness may occur in the coated coating liquid (ie, coating film), and it is difficult to say that coating can be performed stably enough. Moreover, in order to suppress such a coating defect, the need to set coating conditions in a narrow range will arise.

On the other hand, there are cases where foreign matter adheres to the object to be coated until it is sent to the coating roller. This falling coating is obtained. Therefore, it is desirable to remove these foreign substances.

In view of the above circumstances, it is an object of the present invention to provide a coating device and a method for manufacturing a coating film, which can apply a coating solution to a target object while suppressing coating failure, and also enable removal of foreign substances by coating do.

The present inventors have intensively researched to solve the above problems, and in gravure coating, between the coating liquid (coating film) on the object to be coated and the coating liquid (coating film) on the coating roller (the coating liquid on the coating roller is transferred to the object to be coated) It was found that air was entrained (the side immediately before) or between the object and the coating roller (the side immediately after the coating liquid on the coating roller was transferred to the object) (see Fig. 3). In addition, 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 object to be coated increases, the amount of air entrained increases, and the object to be coated is floated with respect to the coating roller. It was discovered that the bead of a coating liquid was not formed between a coating roller and a to-be-coated object, but as a result, coating defect generate|occur|produced.

Further, when the outer diameter of the coating roller is relatively large, unless the numerical range of the difference in the value (size) of the rotation speed of the coating roller to the value (size) of the moving speed of the object to be coated is relatively narrow, the coating liquid on the coating roller It has been found that it is difficult to suppress the amount of air entrained as described above when transferring to the object to be coated, and the sufficient formation of beads tends to be inhibited and poor coating tends to occur. On the other hand, when the coating roller is relatively small, even if the numerical range of the difference is relatively wide, the amount of air entrained as described above can be suppressed, and the beads are sufficiently formed to suppress the occurrence of coating defects. found out that

And when the outer diameter of a coating roller was 60-80 mm, even if the said difference was 0-60 m/min in a wide range, entrainment of the air with respect to a coating liquid was suppressed, and it discovered that coating defect could be suppressed.

In addition, when the difference between the outer diameter of the coating roller and the speed is within the above range, the coating liquid sufficiently forms beads on the object to be coated and prevents the object from floating, so that the object to be coated and the coating liquid are in sufficient contact . In addition, friction occurs between the object to be coated and the coating solution due to the speed difference between the coating roller and the object to be coated at the time of contact. By this friction, even if a foreign material adhered to the surface of the to-be-coated object before coating, even if the foreign material adhered, it discovered that the said foreign material could be removed, and it came to complete this invention.

That is, the coating apparatus which concerns on this invention,

a coating roller for applying a coating solution to a relatively moving object to be coated, the coating roller having a concave portion on an outer circumferential surface thereof;

a chamber and a supply unit configured to supply 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 so that the outer circumferential surface moves in a direction opposite to the moving direction of the object, the coating liquid supplied to the recess is brought into contact with the object, thereby applying the coating liquid to the object. It is configured to form a coating film by coating,

The outer diameter of the coating roller is 60 to 80 mm,

It is comprised so that the difference between the value of the rotation speed of the said coating roller and the value of the moving speed of the said to-be-coated object may be 0-60 m/min.

Here, the rotational speed of the coating roller means the moving speed (peripheral speed) of the outer peripheral surface of the coating roller.

In the coating apparatus of the said structure,

The tension|tensile_strength of the said to-be-coated object in the moving direction of the said to-be-coated object downstream from the position where the said coating liquid is coated may be 50-1000 N/m.

In the coating apparatus of the said structure,

The thickness of the said to-be-coated object may be 10-70 micrometers.

In the coating apparatus of the said structure,

The viscosity of the said coating liquid may be 0.5-50 mPa*s.

The manufacturing method of the coating film which concerns on this invention,

A coating roller for applying a coating solution to a relatively moving object to be coated, the coating roller having a concave portion on its outer circumferential surface is rotated so that the outer circumferential surface moves in a direction opposite to the moving direction of the to-be-coated object, while rotating the concave portion a coating step of forming a coating film by applying the supplied coating liquid to the object to be coated, thereby applying the coating liquid to the object to be coated;

The coating process is

A supply that has a chamber and supplies the coating liquid in the chamber to at least the recessed portion of the outer circumferential surface of the coating roller using a supply unit configured to supply the coating liquid in the chamber to at least the recessed portion of the outer circumferential surface of the coating roller have fairness,

The outer diameter of the coating roller is 60 to 80 mm,

It is a method in which the difference between the value of the rotation speed of the said coating roller and the value of the moving speed of the said to-be-coated object is made into 0-60 m/min.

Here, similarly to what was mentioned above, the rotation speed of a coating roller means the moving speed (peripheral speed) of the outer peripheral surface of a coating roller.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows schematically the cross section which cut|disconnected the coating apparatus of one Embodiment of this invention in the direction perpendicular|vertical to the 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 diagram schematically showing a state in which air is entrapped between an object to be coated and a coating roller;
It is a graph which shows the relationship between the difference of the rotation speed of a coating roller with respect to the moving speed of a to-be-coated object, and the removal rate of a foreign material when a coating roller with an outer diameter of 50 mm is used.
It is a graph which shows the relationship between the difference of the rotation speed of a coating roller with respect to the moving speed of a to-be-coated object, and the removal rate of a foreign material when a coating roller with an outer diameter of 60 mm is used.
It is a graph which shows the relationship between the difference of the rotation speed of a coating roller with respect to the moving speed of a to-be-coated object, and the removal rate of a foreign material when a coating roller with an outer diameter of 80 mm is used.
It is a graph which shows the relationship between the difference of the rotation speed of a coating roller with respect to the moving speed of a to-be-coated object at the time of using a 90 mm outer diameter coating roller, and the removal rate of a foreign material.
Fig. 8 is a graph showing the relationship between the viscosity of the coating solution and the removal rate of foreign substances;

EMBODIMENT OF THE INVENTION Hereinafter, the coating apparatus which concerns on embodiment of this invention is demonstrated, referring drawings. In this embodiment, although the example which employ|adopted the sheet member 50 as the to-be-coated object 50 is demonstrated, the to-be-coated object 50 is not limited to the sheet member 50. As shown in FIG.

The coating apparatus 1 of this embodiment is the coating roller 2 which coats the to-be-coated object 50 with the coating liquid 30, and forms the coating film 40, as shown in FIG. 1, FIG. , a coating roller 2 having a concave portion 2a on its outer circumferential surface; to provide

The coating apparatus 1 of this embodiment coats the coating liquid 30 supplied to the recessed part 2a, rotating the coating roller 2 in the direction opposite to the moving direction of the to-be-coated object 50 It is comprised so that the coating liquid 30 may be applied to the to-be-coated object 50 by making it contact the object 50, and the coating film 40 may be formed. The coating apparatus 1 provided with the above coating rollers 2 is generally called a gravure coating apparatus.

Moreover, in the coating apparatus 1 of this embodiment, the supply part 3 is a recessed part ( of the coating liquid 30 supplied to the outer peripheral surface of the coating roller 2 on the downstream side in the rotation direction of the coating roller 2 ) 2a) The first blade member 6 for removing the outside coating liquid 30 is provided.

Moreover, in the coating apparatus 1 of this embodiment, the supply part 3 is the rotation direction upstream of the coating roller 2, The 2nd blade which seals so that the coating liquid 30 may not leak from the supply part 3 A member (8) is provided.

The coating apparatus 1 of this embodiment supplies the coating liquid 30 to the outer peripheral surface of the coating roller 2 from the supply part 3, and coating outside the recessed part 2a among the coating liquid 30 supplied to the outer peripheral surface. The liquid 30 is configured to be removed by the first blade member 6 . Moreover, the coating apparatus 1 of this embodiment is comprised so that the sheet|seat member 50 may be moved relatively with respect to the supply part 3 in a predetermined direction. Moreover, the coating apparatus 1 of this embodiment rotates the coating roller 2 in one direction, and, while rotating the coating roller 2 in one direction, a part of the coating liquid 30 supplied to the outer peripheral surface of the coating roller 2 is used as the sheet|seat as to-be-coated object 50. It is comprised so that the coating liquid 30 in the recessed part 2a may be continuously applied to the sheet|seat member 50, making it contact the member 50. Moreover, it is comprised so that 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 may become opposite directions in a coating part.

The coating liquid 30 is usually coated on the sheet member 50 and then solidifies on the sheet member 50 to form the coating film 40 . As the coating liquid 30, the solution containing the polymer material hardened|cured is mentioned, for example. Examples of the cured polymer material include thermosetting materials, ultraviolet curable materials, and electron beam curable materials. Of these, the polymer material is preferably an ultraviolet curable material.

In addition, coating includes printing and coating.

Although the viscosity of the said coating liquid 30 is not specifically limited, 0.5-50 mPa*s is preferable, and 10-50 mPa*s is more preferable.

When the viscosity of the coating liquid 30 is 0.5-50 mPa*s, entrainment of the air with respect to the coating liquid 30 can be suppressed further. Thereby, since the bead of the coating liquid 30 can be formed more fully between the sheet member 50 and the coating roller 2, coating defect can be suppressed further and it becomes possible to remove a foreign material further.

In addition, the viscosity of the coating liquid 30 is the value measured on the conditions of the shear rate 1 (1/s) at 20 degreeC using a rheometer (model RS1, the HAAKE company make).

The sheet member 50 is usually formed in a band 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 in the direction of the rotation axis of the coating roller 2 .

Although the thickness of the sheet member 50 is not specifically limited, For example, it is about 5-80 micrometers, and 10-70 micrometers is preferable.

The said coating roller 2 is formed in the cylindrical shape. The coating roller 2 is comprised so that it may rotate with a cylindrical shaft as a rotation axis.

The said coating roller 2 is arrange|positioned so that a part of the coating liquid 30 supplied to the outer peripheral surface may contact a part of the sheet member 50. As shown in FIG. And the coating roller 2 is comprised so that the coating liquid on an outer peripheral surface may contact the sheet member 50 along the circumferential direction by rotating at least once.

The outer peripheral surface of the coating roller 2 has a peripheral surface portion 2b arranged along the circumference as viewed from one side in the cylindrical axial direction of the cylindrical coating roller 2, and a concave portion concave inward than the peripheral surface portion 2b ( 2a).

A plurality of the concave portions 2a are formed on the outer peripheral surface of the coating roller 2 . Moreover, many recessed parts 2a are formed over the whole outer peripheral surface of the coating roller 2 .

In the coating apparatus 1 of this embodiment, the pattern shape of the recessed part 2a is not specifically limited, As this pattern shape, for example, linear shape (does not intersect each other, for example, a plurality of parallel linear grooves) ) or a honeycomb shape (a plurality of mutually intersecting linear grooves), and the like.

Moreover, you may form so that this linear or honeycomb-shaped recessed part 2a may be 100-2500 lines/inch.

The outer diameter of the coating roller 2 is 60-80 mm. In addition, this outer diameter is the diameter of the outermost periphery of the coating roller 2 .

When the outer diameter of the coating roller 2 is 60 to 80 mm, this means that the difference (Vr-Vm) of the rotational speed Vr of the coating roller 2 with respect to the moving speed Vm of the sheet member 50 is 0 to 60 m/min. In combination with this, it can suppress that the coating liquid 30 comes into contact with the sheet member 50 in the state accompanying the rotation of the coating roller 2 with air. Thereby, since it can suppress that the coating liquid 30 is coated to the sheet member 50 while air is interposed between the coating liquid 30 and the sheet member 50, the coating roller 2 and the sheet member Between (50) enough beads of the coating solution (30) can be formed.

Although the length (width) of the longitudinal direction of the coating roller 2 is not specifically limited, For example, it is 500-2500 mm.

The difference between the value (size) of the rotation speed of the coating roller 2 (size) Vr and the value (size) of the moving speed of the sheet member 50 Vm is the value (absolute value) of the rotation speed of the coating roller 2 Vr to the sheet member ( 50) minus the value (absolute value) Vm of the velocity, and this difference is 0 to 60 m/min (V=Vr-Vm). In addition, the rotational speed Vr of the coating roller 2 is the moving speed (peripheral speed) of the outer peripheral surface of the coating roller 2 .

When the difference V is 0 to 60 m/min, this coincides with the outer diameter of the coating roller 2 being 60 to 80 mm, and the coating liquid 30 (coating film) on the sheet member 50 and the coating roller 2 Air entrained between the coating liquid 30 (coating film) or between the sheet member 50 and the coating roller 2 as the sheet member 50 moves and the coating roller 2 rotates (see FIG. 3 ) ) is suppressed, and the contact state (positional relationship) of the coating roller 2 and the sheet member 50 is stabilized. In this way, since it is possible to suppress the coating solution 30 from being applied to the sheet member 50 while entraining unnecessary air, sufficient coating solution 30 is formed between the coating roller 2 and the sheet member 50 . Beads can be formed.

The moving speed of the sheet member 50 is, for example, 5 to 100 m/min. The sheet member 50 is conveyed by, for example, a conveying device (not shown), and in this case, the conveying speed corresponds to the moving speed.

The coating apparatus 1 of this embodiment is comprised so that the sheet member 50 may be pressed against the outer peripheral surface of the coating roller 2 .

In the coating apparatus 1 of this embodiment, the tension|tensile_strength of the sheet|seat member 50 is not specifically limited. For example, as for the tension of the sheet member 50, it is preferable that the tension of the sheet member on the downstream side in the moving direction of the sheet member 50 than the position where the coating solution 30 is applied is 50 to 1000 N/m. and 100 to 500 N/m is more preferable.

When the tension of the sheet member 50 on the downstream side is 50 to 1000 N/m, entrainment of air to the coating solution 30 can be further suppressed. Thereby, since the bead of the coating liquid 30 can be formed more fully between the sheet member 50 and the coating roller 2, coating defect can be suppressed further and it becomes possible to remove a foreign material further.

The supply unit 3 includes a chamber 3a for supplying the coating solution 30 collected therein to the outer circumferential surface of the coating roller 2, and an inflow path 3b for introducing the coating solution 30 into the chamber 3a. and an outlet path 3c for discharging the coating solution 30 from the chamber 3a, and a circulation tank for sending and circulating the coating solution 30 flowing out through the outlet path 3c to the inflow path 3b (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, and the opening is closed by the coating roller 2 . The said chamber 3a is comprised so that the coating liquid 30 may be supplied from the said opening to the outer peripheral surface of the coating roller 2 while filling an internal space with the coating liquid 30. As shown in FIG. That is, the chamber 3a is generally referred to as a closed chamber.

The said chamber 3a is arrange|positioned behind the part where the coating liquid 30 is coated on the sheet|seat member 50. As shown in FIG. Moreover, the chamber 3a is arrange|positioned so that the said opening may follow the outer peripheral surface of the coating roller 2 .

The said chamber 3a is comprised so that the coating liquid 30 which flowed in from the inflow path 3b may be collected. Moreover, the chamber 3a has the 2nd blade member 8 in the part which adjoins the outer peripheral surface of the coating roller 2 so that the coating liquid 30 may not leak. The chamber 3a is configured to supply a portion of the coating solution 30 collected therein to the outer peripheral surface of the coating roller 2 while suppressing the leakage of the coating solution 30 by the second blade member 8 . .

The inflow path (3b), one side is connected to the tank for circulation (3d), the other side is connected to the chamber (3a). The inflow path 3b has the pump P for sending the coating liquid 30. The inflow path 3b is comprised so that the coating liquid 30 liquid-fed by the pump P may be sent from the tank 3d for circulation to the chamber 3a.

As said pump P, conventionally well-known pumps, such as a gear pump, a diaphragm pump, a plunger pump, a snake pump, are mentioned, for example.

One side of the outflow path 3c is connected to the chamber 3a, and the other side is connected to the circulation tank 3d. The outflow path 3c is comprised so that the coating liquid 30 may be sent from the chamber 3a to the tank 3d for circulation.

The said tank 3d for circulation is comprised so that the coating liquid 30 sent through the outflow path 3c may be temporarily collected.

The supply unit 3 collects the coating solution 30 flowing in from the inflow path 3b into the chamber 3a, and supplies a part of the collected coating solution 30 to the outer peripheral surface of the coating roller 2 . Moreover, the said supply part 3 is comprised so that the coating liquid 30 which is not supplied to the outer peripheral surface of the coating roller 2 in the chamber 3a may be sent to the circulation tank 3d via the outflow path 3c. Thus, the supply part 3 is comprised so that a part of the circulating coating liquid 30 may be supplied to the outer peripheral surface of the coating roller 2, circulating the coating liquid 30. As shown in FIG.

The first blade member 6 is disposed on the frontmost side of the chamber 3a in the rotational direction of 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 first blade member 6 removes the coating liquid 30 adhering to the peripheral surface portion 2b of the outer peripheral surface of the coating roller 2 by the contact portion, and the coating liquid 30 in the concave portion 2a. It is structured to leave a

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

The coating apparatus 1 of this embodiment transfers the coating liquid 30 remaining in the recessed part 2a of the outer peripheral surface of the coating roller 2 to the sheet member 50 by the 1st blade member 6, By It is configured to perform coating.

In the coating apparatus 1 of this embodiment, the thickness of the coating liquid 30 coated on the sheet member 50 may be 0.1-10 micrometers.

Next, one Embodiment of the manufacturing method of the coating film of this invention is demonstrated. The manufacturing method of the coating film 40 of this embodiment can be performed by using the said coating apparatus 1.

The manufacturing method of the coating film of this embodiment is the coating roller 2 which coats the coating liquid 30 to the to-be-coated object (here, for example, a sheet member) 50 which moves relatively, It is a recessed part on the outer peripheral surface ( While rotating the coating roller 2 having 2a) so that the outer circumferential surface moves in a direction opposite to the moving direction of the object 50, the coating solution 30 supplied to the concave portion 2a is applied to the target. A coating step of applying the coating solution 30 to the object 50 by contacting the coated object 50 to manufacture the coating film 40 is provided.

In the coating step, a supply unit 3 having a chamber 3a and 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 is used. and 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 .

In the manufacturing method of the coating film 40 of this embodiment, the outer diameter of the said coating roller is 60-80 mm, and the value Vr of the rotation speed of the said coating roller 2 and the moving speed of the said to-be-coated object 50 are The difference between the values Vm is set to 0 to 60 m/min. In addition, the rotational 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 supply unit 3 supplies the coating solution 30 to the concave portion 2a of the outer peripheral surface of the coating roller 2 while circulating the coating solution 30 as described above. .

As the coating roller 2 rotates while the coating liquid 30 is supplied, the coating liquid 30 supplied to the concave portion 2a of the outer peripheral surface of the coating roller 2 is coated on the object 50 . . That is, the coating liquid 30 in the recessed portion 2a is transferred in contact with the object 50 to form the coating film 40 .

As mentioned above, the coating apparatus 1 of this embodiment is,

A coating roller (2) for applying a coating solution (30) to a relatively moving object (50), the coating roller (2) having a concave portion (2a) on its outer circumferential surface;

a chamber (3a) and a supply unit (3) for supplying the coating solution (30) in the chamber (3a) to at least the concave portion (2a) of the outer peripheral surface of the coating roller (2);

While rotating the coating roller 2 so that the outer circumferential surface moves in a direction opposite to the moving direction of the object 50, the coating solution 30 supplied to the recess 2a is applied to the object ( 50), so as to apply the coating solution 30 to the to-be-coated object 50,

The outer diameter of the coating roller (2) is 60 to 80 mm,

It is comprised so that the difference V (=Vm-Vr) of the value Vr of the rotation speed of the said coating roller 2 and the value Vm of the moving speed of the said to-be-coated object 50 may be 0-60 m/min.

According to this structure, the outer diameter of the coating roller 2 is 60 mm - 80 mm, and the difference V of the rotation speed absolute value Vr of the coating roller 2 with respect to the absolute value Vm of the moving speed of the to-be-coated object 50 is 0- 60 m/min, between the coating liquid 30 (coating film) on the object 50 and the coating liquid 30 (coating film) on the coating roller 2, or between the object 50 and the coating roller 2 In the meantime, the amount of air drawn in with the movement of the to-be-coated object 50 and rotation of the coating roller 2 is suppressed, and the contact state (positional relationship) between the coating roller 2 and the to-be-coated object 50 is stabilized In this way, since it is possible to suppress the coating liquid 30 from being coated on the object 50 while entraining unnecessary air, there is sufficient coating liquid 30 between the coating roller 2 and the object 50 . of can be formed, and by the formation of the bead, it is possible to suppress the coating failure caused by the entrainment of the unnecessary air.

In addition, in a state in which the bead is sufficiently formed, friction may be generated between the object to be coated 50 and the coating solution 30 by moving the object to be coated 50 and the coating roller 2 in opposite directions, and this It becomes possible to remove the foreign material adhering to the to-be-coated object 50 by friction.

Therefore, the coating liquid 30 can be coated on the to-be-coated object 50, suppressing coating defect, Furthermore, the removal of a foreign material is also attained by coating.

In the coating apparatus 1 of this embodiment,

The tension of the to-be-coated object 50 downstream of the position to which the said coating liquid 30 is coated in the moving direction of the said to-be-coated object 50 may be 50-1000 N/m.

When the tension of the downstream to-be-coated object 50 is 50-1000 N/m, entrainment of air with respect to the said coating liquid 30 can be suppressed further. Thereby, since the said bead can be formed more fully, coating defect can be suppressed further and it becomes possible to remove a foreign material further.

In the coating apparatus 1 of this embodiment,

The thickness of the to-be-coated object 50 may be 10-70 micrometers.

When the thickness of a to-be-coated object is 10-70 micrometers, entrainment of the air with respect to the said coating liquid can further be suppressed. Thereby, since the said bead can be formed more fully, coating defect can be suppressed further and it becomes possible to remove a foreign material further.

In the coating apparatus 1 of this embodiment,

The viscosity of the said coating liquid 30 may be 0.5-50 mPa*s.

When the viscosity of the coating solution 30 is 0.5 to 50 mPa·s, entrainment of air to the coating solution 30 can be further suppressed. Thereby, since the said bead can be formed more fully, coating defect can be suppressed further and it becomes possible to remove a foreign material further.

In the coating apparatus 1 of this embodiment, you may form linearly or honeycomb shape so that the said recessed part 2a may be 100-2500 lines/inch.

In the coating apparatus 1 of this embodiment, the thickness of the said coating liquid 30 coated on the said to-be-coated object 50 may be 0.1-10 micrometers.

In the coating apparatus 1 of this embodiment, the said coating liquid 30 may contain the ultraviolet curable resin.

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

A coating roller (2) for applying a coating solution (30) to a relatively moving object (50), and a coating roller (2) having a concave portion (2a) on an outer circumferential surface of the object (50) While rotating so that the outer circumferential surface moves in the direction opposite to the movement direction, the coating solution 30 supplied to the recess 2a is brought into contact with the target object 50, whereby the coating solution 30 is applied to the target. A coating process of forming a coating film 40 by coating the coating object 50 is provided;

The coating process is

Using a supply part 3 having a chamber 3a and supplying the coating liquid 30 in the chamber 3a to at least the recessed part 2a of the outer peripheral surface of the coating roller 2, the coating roller a supply step of supplying the coating solution 30 in the chamber 3a to at least the concave portion 2a of the outer peripheral surface of (2);

The outer diameter of the coating roller (2) is 60 to 80 mm,

It is a method in which the difference V (=Vr-Vm) of the value Vr of the rotation speed of the said coating roller 2 and the value Vm of the moving speed of the said to-be-coated object 50 is made into 0-60 m/min.

According to this structure, as mentioned above, the outer diameter of the coating roller 2 is 60-80 mm, The difference of the rotation speed absolute value Vr of the coating roller 2 with respect to the absolute value Vm of the moving speed of the to-be-coated object 50 By setting V to 0 to 60 m/min, sufficient beads of the coating solution 30 can be formed between the coating roller 2 and the object 50, and by forming the beads, the unnecessary air is curled up. It is possible to suppress the coating defect caused by the entrainment.

In addition, in a state in which the bead is sufficiently formed, friction may be generated between the object to be coated 50 and the coating solution 30 by moving the object to be coated 50 and the coating roller 2 in opposite directions, and this It becomes possible to remove the foreign material adhering to the to-be-coated object 50 by friction.

Therefore, the coating liquid 30 can be coated on the to-be-coated object 50, suppressing coating defect, Furthermore, the removal of a foreign material is also attained by coating.

As mentioned above, according to this embodiment, the coating liquid 30 can be coated to the to-be-coated object 50, suppressing coating defect, The coating apparatus 1 and coating film which also become possible to remove a foreign material by coating further. The manufacturing method of (40) is provided.

Although the manufacturing method of the coating apparatus 1 and the coating film 40 of this embodiment is the same as the above, this invention is not limited to the said embodiment, A design change is possible within the range which this invention intends suitably.

Example

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

The coating apparatus of Test Example 1, Test Example 2, and Test Example 3 was operated under the conditions shown below, and the manufacturing method of the coating film was performed, respectively.

(Test Example 1)

The coating apparatus of the said embodiment was operated, and coating performance and the removal rate of a foreign material were investigated. In addition, detailed operating conditions at the time of operation are as follows. In addition, the sheet member was used in a state in which an adhesive was applied to the sheet member, glass beads having a particle diameter of 100 µm were sprayed as a pseudo foreign material, and then dried and the foreign material was adhered to the sheet member.

Sheet member: A sheet member formed of a resin (PET) film (width 0.5 m, thickness 40 μm), and a sheet member with a pseudo-foreign substance attached thereto

Movement speed of sheet member: 20 m/min

The moving direction of the sheet member and the rotating direction of the coating roller: opposite directions

Difference as absolute value between the moving speed of a sheet member and the rotational speed of a coating roller: -10, 0, 20, 40, 60, 80 m/min

Outer diameter of coating roller: 50, 60, 80, 90 mm

Concave part of coating roller: honeycomb shape, 1500 wires/inch, 2mL/㎡

Coating solution: Arufon (40wt%)

Viscosity of coating solution: 50 mPa·s

Circulate the coating fluid in the supply section

(Measurement of viscosity)

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

(Evaluation of coating performance)

The appearance of the coating solution coated on the sheet member was visually observed, and the case in which stripe-like unevenness did not occur is indicated by "○" as extremely good, and the case in which striped unevenness occurs partially is indicated by "Δ" as good, Coating performance was evaluated by showing the case where the stripe-like nonuniformity generate|occur|produced in the whole with "x" as a defect. The results are shown in FIGS. 4, 5, 6 and 7 .

(Evaluation of the removal rate of foreign matter)

Before the coating solution was applied to the sheet member, an area (test area) having a width of 50 mm and a length of 500 mm in the moving direction was photographed, and the number of pseudo-foreign substances existing in the area was counted in advance. After the coating solution is applied to the sheet member, the quantity of the pseudo foreign material present in the test area is counted, and the ratio of the difference between the quantity of the pseudo foreign material before and after coating to the quantity of the pseudo foreign material before coating is calculated according to the following formula , was calculated as the removal rate of foreign matter. The results are shown in FIGS. 4, 5, 6 and 7 .

Removal rate of foreign material = {(quantity of pseudo foreign material before coating) - (quantity of pseudo foreign material after coating)}/(quantity of pseudo foreign material before coating)

(Test Example 2)

Except using the following operating conditions, it carried out similarly to Test Example 1, the coating apparatus of the said embodiment was operated, and the coating performance and the removal rate of a foreign material were investigated. The results are shown in FIG. 8 .

Movement speed of sheet member: 20 m/min

Difference as absolute value between the moving speed of a sheet member and the rotational speed of a coating roller: 60 m/min

Outer diameter of coating roller: 60mm

Viscosity of coating solution: 0.5, 10, 30, 50, 60, 70 mPa·s

(Test Example 3)

Except using the following operating conditions, it carried out similarly to Test Example 1, and operated the coating apparatus of the said embodiment. At this time, while measuring the tension|tensile_strength of the sheet member downstream from the position to be coated in the moving direction of a sheet member, it was investigated whether a sheet member passed the said coating position stably. A result is shown in Table 1.

Movement speed of sheet member: 20 m/min

Difference as absolute value between the moving speed of a sheet member and the rotational speed of a coating roller: 60 m/min

Outer diameter of coating roller: 60mm

Viscosity of coating solution: 50 mPa·s

(measurement of tension)

Using a tension measuring apparatus (LX-100TD, manufactured by Mitsubishi Electric Corporation), the tension of the sheet member downstream from the coated position in the moving direction of the sheet member was measured.

(Evaluation standard)

・Generation of wrinkles in the seat member

The traveling sheet member was visually observed to evaluate whether or not one or more wrinkles in the traveling direction of the sheet member were generated. When one or more wrinkles occurred, it was indicated as "occurrence" in Table 1. When wrinkles did not generate|occur|produce, it indicated in Table 1 as "does not generate|occur|produce".

・Running stability of the seat member

The traveling state of the sheet member under coating was visually observed to evaluate whether the sheet member was meandering or waving. A case in which the seat member did not meander or wave was evaluated as stable in running, and "stable" was indicated in Table 1. If not, the driving was evaluated as unstable and marked as "unstable" in Table 1.

· Tensile stability of the seat member

When the tension of the sheet member on the downstream side is continuously measured (monitored) using the tension measuring device, and the variation of the measured tension with respect to the set value (each value shown in Table 1) is less than ±3 N/m, The tension was evaluated to be stable, and "stable" was indicated in Table 1. On the other hand, when the fluctuation is ±3N/m or more, the tension is evaluated as unstable and displayed as “unstable” in Table 1, in particular, when the fluctuation is 150% or more, and the state of 150% or more continues for 3 seconds or more was evaluated as having an abnormality in tension, and marked as “abnormal” in Table 1.

As shown in Figs. 5 and 6, when the outer diameter of the coating roller is 60 to 80 mm, and the difference in the rotation speed of the coating roller with respect to the moving speed of the coating roller is 0 to 60 m/min, stripe coating is applied to the coating film No defects were observed, and the removal rate of foreign matter was also high.

On the other hand, as shown in Fig. 4, when the outer diameter of the coating roller is smaller than 60 mm, no stripe-like coating defects are observed on the coating film only when the difference is 0 m/min, and when the difference is 20 to 80 m/min, The coating defect which is not coated in stripe shape was observed in a part of coating film. In addition, as shown in Fig. 7, when the outer diameter of the coating roller is larger than 80 mm, no stripe-like coating defect is observed on the coating film only when the difference is 0 to 40 m/min, and when the difference is 60 to 80 m/min, The coating defect which is not coated in stripe shape was observed in a part of coating film.

Therefore, when the outer diameter of the coating roller is 60 to 80 mm, and the difference in the rotation speed of the coating roller with respect to the moving speed of the coating roller is 0 to 60 m/min, both the coating performance and the removal rate of foreign matter are higher than when it is outside these ranges. It turned out that it was excellent, and also it turned out that coating can be carried out under wide coating conditions.

As shown in Fig. 8, when the viscosity of the coating solution is 0.5 to 50 mPa·s, it can be seen that both the coating performance and the removal rate of foreign matter are superior than when it exceeds 50 mPa·s, and also under the coating conditions I also knew that I could make pottery.

As shown in Table 1, when the tension on the downstream side from the position where the coating liquid is applied to the sheet member in the moving direction of the sheet member is 50 to 1000 N/m, the sheet member is more stable than when it is outside this range. It was found that it can pass through the coated position. When the thickness of the sheet member was 5 to 70 µm, it was found that the sheet member could pass through the coating position more stably than when it was outside this range. It turned out that when the tension|tensile_strength of the said downstream is 50-1000 N/m, and the thickness of a sheet member is 5-70 micrometers, the sheet|seat member can pass through the said coating position more stably. When the tension on the downstream side is 50 to 1000 N/m and the thickness of the sheet member is 10 to 70 μm, or the tension on the downstream side is 100 to 500 N/m and the thickness of the sheet member is 5 to 70 μm In the case of , it turned out that a sheet|seat member can pass through the said coating position more stably.

As mentioned above, although embodiment and Example of this invention were demonstrated, it is also planned from the beginning to combine the characteristics of each embodiment and Example suitably. In addition, it should be thought that embodiment and 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 all changes within the meaning and scope equivalent to the claims are included.

1: coating device
2: coating roller
2a: recess
2b: peripheral surface part
3: supply
3a: chamber
3b: Funnel
3c: Outflow Path
3d: tank for circulation
6: first blade member
8: second blade member
30: coating solution
40: coating film
50: object to be coated (sheet member)

Claims (6)

A coating roller for applying a coating solution to a relatively moving object to be coated, the coating roller having a concave portion on an outer peripheral surface thereof;
a chamber and a supply unit configured to supply 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 so that the outer circumferential surface moves in a direction opposite to the moving direction of the object, the coating liquid supplied to the recess is brought into contact with the object, thereby applying the coating liquid to the object. It is configured to form a coating film by coating,
The outer diameter of the coating roller is 60 to 80 mm,
It is configured such that the difference between the value of the rotation speed of the coating roller and the value of the moving speed of the object to be coated is 0 to 60 m/min,
The coating apparatus of claim 1, wherein the tension of the object on the downstream side of the position where the coating liquid is applied in the moving direction of the object is 50 to 1000 N/m. The method of claim 1,
The thickness of the to-be-coated object is 10-70 micrometers, the coating apparatus. 3. The method of claim 1 or 2,
The coating apparatus whose viscosity of the said coating liquid is 0.5-50 mPa*s. A coating roller for applying a coating solution to a relatively moving object, wherein a coating roller having a concave portion on its outer circumferential surface is rotated so that the outer circumferential surface moves in a direction opposite to the moving direction of the to-be-coated object, while rotating the concave portion a coating step of forming a coating film by applying the coating solution to the object by bringing the supplied coating liquid into contact with the object to be coated;
The coating process is
A supply that has a chamber and supplies the coating liquid in the chamber to at least the recessed portion of the outer circumferential surface of the coating roller using a supply unit configured to supply the coating liquid in the chamber to at least the recessed portion of the outer circumferential surface of the coating roller have fairness,
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 moving speed of the object to be coated is 0 to 60 m/min,
The method for producing a coating film, wherein the tension of the to-be-coated object on the downstream side from the position where the coating liquid is applied in the moving direction of the to-be-coated object is 50 to 1000 N/m. delete delete

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