JP2017047339A - Coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating apparatus capable of maintaining a constant gap between a die and a coating object member even the coating apparatus that forms coating films by discharging a coating liquid out of a die to the coating object member transported on a backup roll has backup roll eccentricity and thickness irregularity in a transportation direction of the coating object member.SOLUTION: A coating apparatus has a die body that discharges a coating liquid to a coating object member transported on a backup roll, a gas jetting part, positioned at both end parts in a crosswise direction of the die body and provided to be movable integrally with the die body in a state of projection to a side closer to the coating object member than to the die body, and a pressure adjustment part that adjusts pressure of the gas jetted out of the gas jetting part to adjust a gap between the die body and the coating object member, and further has a static pressure pocket in a gas jetting face of the gas jetting part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coating apparatus that forms a coating film by discharging a coating liquid from a die to a coated member that is conveyed on a backup roll that is a support having an arcuate surface, and the die and the coated member It is related with the coating device which can maintain the space | gap formed between these with high precision.

  A die coater is known as one of coating apparatuses that form a functional coating film on a strip-shaped coated member such as a film, paper, or cloth. In the die coater, the tip end surface of the die is brought close to and opposed to the belt-shaped member to be transported held on the backup roll, and the coating liquid is discharged from the tip surface between the member to be coated. A coating film is formed on the surface of the member to be coated while forming a liquid pool called a bead (hereinafter referred to as a bead).

  A slit-like coating liquid discharge port that is long in the width direction of the member to be coated is formed on the tip surface of the die, and the coating liquid is discharged from the coating liquid discharge port at a uniform flow rate in the width direction. A coating film having a uniform thickness in the width direction can be formed on the surface of the coating member. In addition, by maintaining the flow rate of the coating solution supplied to the die body constant over time, a coating film having a uniform thickness can be formed in the conveying direction of the member to be coated.

Furthermore, in the die coater, in order to form a coating film having a uniform thickness in the conveying direction of the member to be coated, it is necessary to maintain a constant gap (hereinafter referred to as a gap) between the die tip surface and the member to be coated.
For example, if the gap is widened during coating, the space between the die tip surface and the member to be coated is widened, so that the required volume of beads formed in the space is also increased. In order to compensate for this volume change, a part of the coating liquid discharged from the coating liquid discharge port is consumed for increasing the volume of the bead, and as a result, the volume of the coating liquid applied onto the member to be coated is temporarily reduced. As a result, the thickness of the formed coating film is reduced. Furthermore, when the gap spread during coating becomes large, the bead is cut, making it impossible to form the coating film itself.
Conversely, if the gap is narrowed during coating, the space between the die tip surface and the member to be coated is narrowed, so the required volume of beads formed in the space is also small. The excess volume of the coating liquid generated at this time is extruded and coated on the member to be coated. As a result, the volume of the coating liquid to be coated on the member to be coated temporarily increases, and the coating film formed Will become thicker. Further, when the gap narrows during application increases, the die tip surface collides with the member to be coated, and the member to be coated, the die tip surface, and the backup roll are damaged.

  From the above viewpoint, in order to form a coating film having a uniform thickness on the member to be coated, it is necessary to keep the gap between the die and the member to be coated constant.

  Causes of the above-mentioned gap widening or narrowing include thickness unevenness in the conveying direction of the member to be coated, eccentricity of the backup roll that conveys the member to be coated, and foreign matter that has entered between the backup roll and the member to be coated. For example, the application member is lifted. The variation of the gap caused by these is often several μm to several tens of μm, and in order to reduce this influence, the die coater is often applied with the gap set to 100 μm or more.

  However, in recent years, as the application speed of the die coater is increased and the coating film is made thinner, the number of cases in which the gap is set to 100 μm or less is increasing. In these cases, the influence of the above-described gap fluctuation becomes so large that it cannot be ignored. Therefore, it has been a problem to reduce the gap fluctuation during coating.

  Therefore, the present applicant has proposed a coating apparatus provided with a non-contact type gap maintaining means in Patent Document 1. This coating device lifts the die body against a coated member such as a glass substrate fixed on a precision surface plate or a suction plate, and the gap between the tip surface of the die and the surface of the coated member. Is kept constant. Specifically, gas is ejected from the gas ejection surface provided substantially parallel to the die front end surface to the surface of the member to be coated, and a high-pressure static pressure space is formed between the gas ejection surface and the member to be coated. Then raise the die body. At this time, since the gas ejection portion having the gas ejection surface and the die main body are held so as to be integrally movable, when the gas ejection surface follows the undulation in the transport direction of the surface of the coated member, The die body also follows this, and can float and keep the gap constant. In addition, by adjusting the pressure of the gas ejected from the gas ejection surface, it is possible to control the flying height of the die body and control it to a desired gap.

  However, the above-described coating apparatus is intended for a coated member such as a glass plate whose surface is flat, and the surface of the coated member such as a film conveyed on the backup roll is curved. If it is applied as it is to a member to be coated, the following problems arise.

  The first problem is that the levitation force due to the gas ejection part is significantly reduced. This is because the gas ejection surface is a flat surface provided substantially parallel to the die tip surface, whereas the surface of the member to be coated is curved, so that the gap between the gas ejection surface and the surface of the member to be coated is one. Instead, the gap becomes wider as it proceeds in the circumferential direction of the backup roll from the closest tip of the die tip and the backup roll. Therefore, the gas ejected from the gas ejection surface escapes in the circumferential direction of the backup roll, a high-pressure static pressure space is not formed between the gas ejection surface and the surface of the coated member, and the gas ejection portion does not rise. There is a problem. As a result, the die body also does not float with respect to the surface of the member to be coated, and the gap during coating cannot be kept constant. In the worst case, the die tip surface and the surface of the member to be coated collide, and both are damaged. There is a fear.

  As one means for solving this problem, it can be considered that the gas ejection surface is curved to match the surface of the member to be coated. With this means, since the gap between the gas ejection surface and the surface of the coated member can be made uniform, the gas ejected from the gas ejection surface is unlikely to escape in the circumferential direction of the backup roll, and the gas ejection surface A high-pressure static pressure space can be formed between the surfaces of the application member.

  However, with this means, it is necessary to match the curvature of the curved gas ejection surface and the surface of the member to be coated with high accuracy. Therefore, the thickness of the member to be coated is changed, or the pressure of the gas supplied to the gas ejection part is adjusted to adjust the gap. Or the curvature of the gas ejection surface and the member to be coated is shifted. As a result, the gap between the gas ejection surface and the surface of the member to be coated is not uniform, and the gas escapes from the wide gap. The levitation force of the die body will be reduced.

  In the above-described means, it is necessary to precisely adjust the position and angle of the gas ejection portion so that the gap between the gas ejection surface and the surface of the member to be coated is uniform. Specifically, it is necessary to match the central axis of the curved surface of the gas ejection surface with the central axis of the curved surface of the coated member (that is, the central axis of the backup roll), but accurately grasp the latter position. It is difficult to position these with high accuracy.

  As described above, from the two viewpoints of coincidence of curvature and coincidence with the center axis of the backup roll, it is very difficult to make the gas ejection surface curved so as to match the surface of the member to be coated.

  The second problem is that the flow rate of the gas flowing out from the gas ejection part increases. As described in the first problem, when the surface of the member to be coated has a curved surface, the gas ejected from the gas ejection surface is in the circumferential direction of the backup roll. It escapes and the levitation force of the die decreases. As a countermeasure, it is conceivable to increase the levitation force by increasing the pressure of the gas supplied to the gas ejection part, but at this time, the flow rate of the gas escaping in the circumferential direction of the backup roll increases. As a result, not only the gas consumption increases, but also the gas flows out to the side on which the coating film is formed, so that the drying of the coating film proceeds in the vicinity of the gas ejection part, resulting in uneven drying. There is a risk of quality degradation.

  Furthermore, if the gas ejected from the gas ejection surface flows out toward the die body and is blown onto the bead, the shape of the bead may be disturbed and a coating film having a uniform thickness may not be formed.

JP 2014-180603 A

  The present invention has been made based on the above circumstances, and provides a coating apparatus capable of maintaining a constant gap between a die and a coated member even for a coated member conveyed on a backup roll. .

  The coating apparatus of the present invention includes a die main body that discharges a coating liquid onto a member to be coated that is conveyed on a backup roll, and is positioned at both ends in the width direction of the die main body, and the coating target is more than the die main body. A gas jetting part for jetting gas to the coated member and a pressure of gas jetted from the gas jetting part are provided so as to be movable integrally with the die body in a state of protruding to the member side. And a pressure control unit that adjusts a gap between the die body and the member to be coated, and further has a static pressure pocket on a gas ejection surface of the gas ejection unit.

  Here, the length of the static pressure pocket in the conveying direction of the member to be coated is preferably larger than 0 and 1/60 or less of the backup roll diameter.

  According to the coating apparatus of the present invention, gas is ejected from a gas ejection portion provided so as to be movable integrally with the die body to the surface of the coating target member conveyed on the backup roll, and the die body is floated. To form a gap. At that time, even if there is uneven thickness in the conveying direction of the member to be coated and eccentricity of the backup roll, the gap is determined with respect to the surface of the member to be coated, so that the gap can be kept constant. Further, by adjusting the pressure of the gas supplied to the gas ejection part, it is possible to change the flying height and control the gap with high accuracy. Furthermore, by forming a static pressure pocket on the gas ejection surface of the gas ejection part, the gas ejected from the gas ejection surface once accumulates inside the static pressure pocket, so that the surface of the member to be coated is curved. However, it is difficult for the gas to escape, and a high levitation force can be obtained with a small amount of gas consumption. Furthermore, by providing the gas ejection part to protrude from the die body toward the coated member side, even when gas is not ejected from the gas ejection part, a gap is formed between the die body and the coated member, The die body and the member to be coated do not collide and the die body is not damaged.

  Furthermore, by making the length of the static pressure pocket in the conveying direction of the coated member larger than 0 and not more than 1/60 of the backup roll, it becomes difficult for gas to escape from the static pressure pocket in the circumferential direction of the backup roll. A high-pressure static pressure space is formed inside the pocket, and a greater levitation force can be obtained.

1 is a schematic side view of a die coater 1 according to the present invention. It is the side surface schematic diagram of the die-coater 1 when the thickness of the to-be-coated member 6 increases. It is a perspective view at the time of seeing the die | dye 2, the gas ejection part 3, and the holding | maintenance part 4 from the W direction in FIG. 3 is an enlarged cross-sectional view of a gas ejection part 3. FIG. It is an expanded sectional view of the gas ejection part 3 of another form. It is an expanded sectional view of the gas ejection part 3 of another form. It is an expanded sectional view of the gas ejection part 3 of the same form as FIG. 4 is a graph in which the relationship between the ratio of the length L of the static pressure pocket 32 and the diameter D of the backup roll 5 and the levitation force of the gas ejection part 3 is calculated. It is an expansion perspective view of the gas ejection part 3 seen from the W direction in FIG. It is the graph which computed the relationship between wall thickness t and the wind speed of the gas which flows out out of the static pressure pocket 32 in a Y direction.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The following description exemplifies one of the embodiments of the present invention, and the present invention is not limited to this. Various modifications can be made without departing from the gist of the present invention.

FIG. 1 is a schematic side view of a die coater 1 according to the present invention. The die coater 1 is provided with a die 2, and the tip end surface 21 of the die 2 is separated from the surface of a belt-shaped member 6 to be conveyed on a backup roll 5 as a support by a predetermined gap G. Are arranged close to each other. A coating liquid is discharged from a slit-like discharge port 22 formed on the die tip surface 21 to form a coating film (not shown) on the surface of the member to be coated 6.
Further, gas ejection portions 3 are provided at both ends in the width direction of the die coater 1 and are held integrally with the die 2 by the holding portion 4. At this time, the gas ejection part 3 is held so as to project by a projecting amount d from the die 2 toward the coated member 6. Further, the die 2, the gas ejection part 3, and the holding part 4 are provided by an arm 43 and a rotation shaft 42 so as to be integrally swingable in the Y-axis rotation direction in the drawing. At this time, since the die 2, the gas ejection part 3, and the holding part 4 are provided so as to be positioned above the rotating shaft 42, the die 2, the gas ejection part 3, and the holding part 4 are close to or separated from the coated member 6. It is possible to move integrally in the direction. Furthermore, the center of gravity of the entire movable part above the rotating shaft 42 is adjusted so as to be positioned on the coated member 6 side with respect to the rotating shaft 42, and the die 2, the gas ejecting portion is operated by the action of the rotational torque due to gravity. 3. A pressing force is generated on the holding portion 4 so as to be pressed against the member 6 to be coated. At this time, since the gas jetting part 3 protrudes from the die 2 to the coated member 6 side by the above-described projection amount d, even if the die 2 is close to the coated member 6 by the pressing force, the gas jetting part first. 3 does not contact the member to be coated 6, and the die 2 does not contact the member to be coated 6, and as a result, the die 2 is not damaged.

  Further, the gas ejection portion 3 is formed with a gas ejection surface 31 that faces and is close to the member to be coated 6, and gas is ejected from the gas ejection surface 31 toward the member to be coated 6. The ejection part 3 generates a levitation force in a direction away from the member to be coated 6. The floating amount F of the gas ejection part 3 is uniquely determined by the balance between the floating force and the pressing force, and as a result, the gap G between the die 2 and the member to be coated 6 is also uniquely determined. Specifically, the gap G is the sum of the projection amount d of the gas ejection part 3 and the flying height F of the gas ejection part 3.

At this time, even if the eccentricity during rotation of the backup roll 5 or the thickness unevenness in the transport direction exists in the member to be coated 6 transported on the backup roll 5, the gas ejection part 3 is in contact with the surface of the member to be coated 6. Therefore, the flying height F or the gap G is kept constant.
FIG. 2 is a schematic side view of the die coater 1 when the thickness of the member to be coated 6 is locally increased in the transport direction. When the thickness of the member to be coated 6 is locally increased, the die 2 and the gas jetting part 3 rotate around the rotating shaft 42 and are separated from the member to be coated 6 in order to balance the above-described levitation force and pressing force. Since it moves in the direction, the flying height is kept constant. At this time, the thickness unevenness of the coated member 6 is several μm to several tens μm, which is very small as compared with the length La of the arm 43, and therefore the inclination θ of the die 2 due to the rotation described above can be ignored.

  Next, means for adjusting the gap G will be described. The gas ejection unit 3 is provided with a pressure control unit (not shown) that adjusts the pressure of the gas supplied thereto, and the gas ejection unit 3 is adjusted by adjusting the pressure of the gas ejected from the gas ejection surface 31. The flying height F or the gap G can be changed. Specifically, by increasing (decreasing) the pressure of the gas ejected from the gas ejection surface 31, the levitation force of the gas ejection section 3 is increased (decreased), and the flying height F of the gas ejection section 3 is increased (decreased). As a result, the gap G can be widened (narrowed).

  Furthermore, a weight 41 is provided on the side opposite to the die 2 with respect to the rotating shaft 42. By changing the weight of the weight 41, the above-mentioned pressing force can be adjusted, and the flying height or the gap G of the gas ejection part 3 can be changed. Specifically, when the pressure of the gas ejected from the gas ejection surface 31 is constant, the weight of the weight 41 is increased (decreased), whereby the Z-direction rightward pressing force acting on the gas ejection part 3 is decreased (increased). As a result, the flying height of the gas ejection part 3 becomes large (small), and as a result, the gap G can be widened (narrow).

  FIG. 3 is a perspective view of the die 2, the gas ejection part 3, and the holding part 4 when viewed from the W direction in FIG. A slit-like discharge port 22 that is long in the width direction of a member to be coated (not shown) is formed on the tip surface 21 of the die 2. Further, gas ejection portions 3 are provided at both ends in the width direction of the die 2, and static pressure pockets 32 are formed on the gas ejection surface 31 of the gas ejection portion 3. As shown in FIG. 3, the static pressure pocket 32 is constituted by a wall surface 38 covering four sides.

FIG. 4 is an enlarged cross-sectional view of the gas ejection part 3. A static pressure pocket 32 is formed on the gas ejection surface 31 of the gas ejection part 3. Furthermore, the inside of the gas ejection part 3 has a hollow structure, and a manifold 33 is formed. The manifold 33 and the static pressure pocket 32 are separated by a wall surface 37, and an ejection hole 34 that communicates the manifold 33 and the static pressure pocket 32 is opened in the wall surface 37. Further, a gas supply pipe 35 communicates with the manifold 33.
In the gas ejection part 3 of FIG. 4, the gas supplied from the gas supply pipe 35 is once stored in the manifold 33, and then ejected through the ejection holes 34 to the surface of the member 6 to be coated. The jetted gas is once stored in the static pressure pocket 32 and then flows out of the gas jetting part 3 through the gap g between the gas jetting surface 31 and the coated member 6. At this time, since the gap g between the gas ejection surface 31 and the member to be coated 6 is very narrow, a pressure loss corresponding to the gas flow rate occurs between the gas ejection surface 31 and the member to be coated 6, and as a result, the static pressure A high-pressure static pressure space is formed inside the pocket 32. As a result, a leftward force f ′ in FIG. 4 is generated on the wall surface 37 inside the static pressure pocket 32, and this acts as a levitation force, so that the gas ejection part 3 floats with respect to the coated member 6.

  FIG. 5 is an enlarged cross-sectional view of another form of the gas ejection portion 3. Except for not forming the static pressure pocket 32, it is the same as the gas ejection part 3 of FIG. In the gas ejection part 3 of FIG. 5, the gas supplied from the gas supply pipe 35 is once stored in the manifold 33, and then ejected from the gas ejection surface 31 to the surface of the coated member 6 through the ejection hole 34. The At this time, since the surface of the member to be coated 6 is curved, the ejected gas does not enter the central portion of the gas ejection surface 31 and flows out of the gas ejection portion 3 through the gap g. As described above, in the gas ejection part 3 of FIG. 5, the ejected gas is not accumulated on the gas ejection surface 31 and a high-pressure static pressure space is not formed, and therefore the levitation force is remarkably higher than the gas ejection part 3 of FIG. 4. descend.

  FIG. 6 is an enlarged cross-sectional view of another form of the gas ejection part 3. 4 is the same as the gas ejection part 3 of FIG. 4 except that a porous member 36 is used instead of the ejection hole 34 and the wall surface 37. In the gas ejection part 3 of FIG. 6, the gas stored in the manifold 33 passes through the porous member 36 and is ejected to the coated member 6. The ejected gas is once stored in the static pressure pocket 32 and then flows out of the gas ejection part 3 through the gap g between the gas ejection surface 31 and the coated member 6. Thus, the form of the gas ejection hole is not particularly limited, and any gas may be used as long as the gas is ejected to the surface of the coated member 6 through the static pressure pocket 32.

  FIG. 7 is an enlarged cross-sectional view of the gas ejection portion 3 having the same form as FIG. In FIG. 7, the static pressure pocket 32 has a depth H of the static pressure pocket 32, since it is sufficient to once store the gas before the jetted gas flows out between the gas ejection surface 31 and the member 6 to be coated. What is necessary is just to be larger than the flying height F which is the clearance gap between the gas ejection surface 31 and the to-be-coated member 6. FIG.

  In FIG. 7, the length L in the conveyance direction 6 of the member to be coated of the static pressure pocket 32 is preferably 1/60 or less of the diameter D of the backup roll 5. More preferably, it is 1/75 or less, More preferably, it is 1/100 or less. This is because the surface of the member to be coated 6 has a curved surface, and as the length L of the static pressure pocket 32 increases, the gap g between the gas ejection surface 31 and the member to be coated 6 increases. This is because gas easily escapes. As a result, a high-pressure static pressure space cannot be formed inside the static pressure pocket 32, the levitation force of the gas ejection part 3 is reduced, and the gas ejection part 3 and the coated member 6 may collide. Further, when the backup roll diameter D is reduced, the curvature of the surface of the member to be coated 6 is increased, and the gap g between the gas ejection surface 31 and the member to be coated 6 is further increased. Run away.

  FIG. 8 is an example of a graph in which the ratio between the length L of the static pressure pocket 32 and the diameter D of the backup roll 5 and the levitation force of the gas ejection part 3 is calculated. At this time, the diameter D of the backup roll 5 is 300 mm, the shape of the gas ejection surface 31 is 10 mm square, the pressure of the gas ejected from the gas ejection surface 31 is 100 kPa, and the depth H of the static pressure pocket 32 is 0.1 mm. The length of the static pressure pocket 32 in the width direction (Y direction) was 3 mm, and the flying height F was 10 μm. The inventors of the present invention have found that if L / D is 1/60 or less, the levitation force is increased as compared with the case where the static pressure pocket 32 is not provided (the point of “None” in FIG. 8). It was. On the other hand, when L / D is made larger than 1/60, it has been found that the levitation force is reduced as compared with the case where the static pressure pocket 32 is not provided. In view of the above-described results, when the static pressure pocket 32 is provided on the gas ejection surface 31 for the purpose of improving the floating force of the gas ejection part 3, the ratio between the length L of the static pressure pocket 32 and the diameter D of the backup roll 5 is used. L / D is preferably 1/60 or less, more preferably 1/75 or less, and still more preferably 1/100 or less.

  Further, FIG. 9 is an enlarged perspective view of the gas ejection portion 3 as viewed from the W direction in FIG. 1. The X direction in FIG. 9 is the conveying direction of the coated member 6, and the Y direction in FIG. The width direction of the application member 6 is shown respectively. A static pressure pocket 32 is formed at the center of the gas ejection surface 31 of the gas ejection part 3, and the static pressure pocket 32 is surrounded by a wall surface 38 on all sides.

  In FIG. 9, among the wall surfaces 38 surrounding the static pressure pocket 32, the wall thickness 38 a of the wall surface 38 a in the Y direction with respect to the static pressure pocket 32 is preferably 1 mm or more. This is because when the wall thickness t is smaller than 1 mm, the wind speed of the gas flowing out from the static pressure pocket 32 in the Y direction of FIG. 9, that is, in the direction of the center of the member to be coated (not shown) increases. There is a possibility that gas blows onto the coating film formed on the member to be coated to cause drying unevenness and deteriorate the quality of the coating film. In addition, gas is blown onto the bead to disturb the shape of the bead, which may cause unevenness of the coating film or breakage of the coating film, thereby reducing the quality of the coating film.

  FIG. 10 shows the relationship between the wall thickness 38a of the wall surface 38a in the Y direction with respect to the static pressure pocket 32 and the wind velocity of the gas flowing out of the static pressure pocket 32 in the Y direction. It is the calculated graph. At this time, the diameter D of the backup roll 5 is 300 mm, the shape of the gas ejection surface 31 is 10 mm square, the pressure of the gas ejected from the gas ejection surface 31 is 100 kPa, and the depth H of the static pressure pocket 32 is 0.1 mm. The length L in the conveying direction of the static pressure pocket 32 was 3 mm (L / D = 1/100), and the flying height F was 10 μm. The inventors of the present invention outflow from the static pressure pocket 32 in the Y direction when the wall thickness 38a of the wall surface 38a in the Y direction with respect to the static pressure pocket 32 is smaller than 1 mm. It has been found that the wind speed of the gas is significantly increased. In view of the above results, the wall thickness t of the wall surface 38a in the Y direction with respect to the static pressure pocket 32 among the wall surfaces 38 surrounding the static pressure pocket 32 is preferably 1 mm or more, more preferably 2 mm or more. More preferably, it is 3 mm or more.

  In addition, in each drawing of this embodiment, although the shape of the static pressure pocket 32 was made into the rectangle, it is not limited to this, For example, circular, an ellipse, and a polygon may be sufficient.

  In the present embodiment, the die 2 is disposed and applied to the side of the backup roll 5. However, the present invention is not limited thereto, and the die 2 is disposed and applied at an arbitrary position of the backup roll 5. But it ’s okay. For example, the die 2 may be disposed above the backup roll 5 and applied.

DESCRIPTION OF SYMBOLS 1 Die coater 2 Die 3 Gas ejection part 4 Holding part 5 Backup roll 6 Application | coating member 21 Die front end surface 22 Discharge port 31 Gas ejection surface 32 Static pressure pocket 33 Manifold 34 Ejection hole 35 Gas supply piping 36 Porous member 37 Wall surface 38 38a Wall 41 covering the static pressure pocket 32 Weight 42 Rotating shaft 43 Arm d Projection amount D of the gas ejection part 3 with respect to the die 2 Diameter F of the backup roll F Lifting amount f ′ Leftward force G Gap between the die 2 and the coated member 6 g Gap between the gas ejection surface 31 and the member 6 to be coated Depth La of the static pressure pocket 32 Length L of the arm 43 X direction of the static pressure pocket 32 (conveying direction of the member 6 to be coated) Length t Thickness (static Wall thickness in the Y direction among the walls surrounding the pressure pocket)
θ Inclination of die 2

Claims (2)

A die main body that discharges a coating liquid to a member to be transported on a backup roll, a state that is located at both ends in the width direction of the die main body, and protrudes toward the member to be coated from the die body The die main body and the die main body are adjusted so as to be movable integrally with the die main body, and adjust the pressure of the gas jetting part for jetting gas to the coated member, and the gas jetted from the gas jetting part. And a pressure control unit that adjusts a gap between the members to be coated, and further has a static pressure pocket on a gas ejection surface of the gas ejection unit. 2. The coating apparatus according to claim 1, wherein a length of the static pressure pocket in a conveying direction of the member to be coated is greater than 0 and 1/60 or less of the diameter of the backup roll.

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