Die head and coating device equipped with the same

Abstract

To provide a die head which allows easy changing of the discharge width of an outlet to a desired width, and a coating device equipped with the same.SOLUTION: A die head 10 for discharging a coating liquid P from a slit-shaped outlet 18 comprises: a first die 20 having a storage part 25 for storing the coating liquid; a shim plate 40 in which a plurality of flow paths 45, 46, 47, and 48 each having an inlet 43a and an outlet 43b and connecting the storage part and the outlet are provided in a lengthwise direction B; a second die 30 that is disposed opposite to the first die and that holds the shim plate cooperatively with the first die; seals 55, 65, and 75 that close the inlets of the flow paths; and actuators 50, 60, and 70 that move the seals to closed or open positions. By switching the flow paths between closed and open states using the actuators, the discharge width of the coating liquid discharged from the outlet is changed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a die head and a coating device including the die head. [Background technology]

[0002] As a conventional technique for a die head that can change the coating width, for example, Patent Document 1 discloses a coating head that can accommodate different coating widths by disassembling and assembling the nozzle block and replacing shim plates. Patent Document 2 discloses a coating head in which the discharge width (coating width) of a linear nozzle can be changed by narrowing or widening the inlet length of the linear nozzle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-55208 A [Patent Document 2] JP 2018-69230 A Summary of the Invention [Problem to be solved by the invention]

[0004] The coating head of Patent Document 1 has the problem that the work of disassembling and assembling the nozzle block and replacing the shim plate is very time-consuming and requires skill.The coating head of Patent Document 2 has the problem that the discharge width of the linear nozzle is determined by the movement of the seal member, so the coating liquid spreads inside the slit, making it difficult to determine the coating width on the substrate.

[0005] An object of the present invention is to provide a die head and a coating device that can easily change the discharge width of a coating liquid. [Means for solving the problem]

[0006] In order to solve the above problems, a die head according to one aspect of the present invention comprises: A die head that discharges a coating liquid from a slit-shaped discharge port, A first die having a storage portion for storing the coating liquid; A shim plate having a plurality of flow paths in a longitudinal direction, the flow paths connecting the storage portion and the discharge port and having an inlet and an outlet; a second die disposed opposite to the first die and cooperating with the first die to hold the shim plate therebetween; a seal blocking the inlet of the flow passage; an actuator for moving the seal to a closed position or an open position; The actuator is used to switch between an open state and a closed state of the flow path, thereby changing the discharge width of the coating liquid discharged from the discharge port. Effect of the Invention

[0007] According to this invention, the seals driven by the actuator open or close the inlets of multiple flow paths, so that the ejection width of the coating liquid (the coating width of the coating pattern) can be set to a predetermined width and can be easily changed. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a diagram illustrating a coating device including a die head according to the first embodiment in which the second die is omitted. [Diagram 2] FIG. 2 is a cross-sectional view illustrating a die head according to the first embodiment. [Diagram 3] FIG. 2 is a front view of a first die of the die head according to the first embodiment. [Figure 4] 4 is a cross-sectional view of the first die taken along line IV-IV shown in FIG. 3. [Diagram 5] FIG. 4 is a front view of a second die of the die head according to the first embodiment. [Figure 6] FIG. 6 is a cross-sectional view of the second die shown in FIG. 5. [Figure 7] FIG. 2 is a front view of a shim plate of the die head according to the first embodiment. [Figure 8]8 is a cross-sectional view of the shim plate shown in FIG. 7 taken along line VIII-VIII. [Figure 9] FIG. 2 is a cross-sectional view illustrating a seal structure of the die head according to the first embodiment. [Figure 10] FIG. 2 is a diagram illustrating a cleaning process before coating in a die head. [Figure 11] 11A to 11C are diagrams illustrating the operation of the die head in a cleaning process. [Figure 12] 11A to 11C are diagrams illustrating the operation of the die head in a cleaning process. [Figure 13] FIG. 1 is a diagram illustrating a coating process using a central channel. [Figure 14] FIG. 11 is a diagram illustrating a coating step further using a first flow path. [Figure 15] FIG. 13 is a diagram illustrating a coating step in which a second flow path is further used. [Figure 16] FIG. 13 is a diagram illustrating a coating step in which a third flow path is further used. [Figure 17] 10 is a diagram illustrating a shim plate of a die head according to the second embodiment. FIG. [Figure 18] FIG. 11 is a diagram illustrating a die head according to a third embodiment. [Figure 19] FIG. 19 is a cross-sectional view illustrating the die head shown in FIG. [Figure 20] FIG. 11 is a diagram illustrating a die head according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the die head 10 and the coating device 1 according to the present invention will be described with reference to the drawings. In the following description, terms indicating specific directions or positions (for example, terms including "upper", "lower", "right", "left", "front" and "rear") are used as necessary, but the use of these terms is for the purpose of facilitating understanding of the present disclosure with reference to the drawings, and the technical scope of the present disclosure is not limited by the meaning of these terms. In addition, the dimensions, materials, shapes, relative positions, etc. of the components described in the following embodiments are not intended to limit the scope of the present invention to only those unless otherwise specified.

[0010] [Overall configuration of coating device] Fig. 1 is a diagram illustrating a coating device 1 including a die head 10 according to embodiment 1. The overall configuration of the coating device 1 will be described with reference to Fig. 1. In Fig. 1, the open state of the valve is shown in white, and the closed state of the valve is shown in black.

[0011] As shown in FIG. 1, the coating device 1 includes a coating liquid supplying device 3 and a die head 10. The coating liquid supplying device 3 is connected to the die head 10 via a pipe 6. The coating liquid P stored in the coating liquid supplying device 3 is pressurized by a pressurizing device 4 and a driving device 5. The coating liquid P is supplied to the die head 10 through the pipe 6 by opening a liquid supplying valve 7. The coating liquid P is a general term for liquids having fluidity, such as water-like liquids, paste-like high-viscosity liquids, and high-concentration slurry. The die head 10 discharges the coating liquid P from a slit-shaped discharge port 18. If the coating liquid P stored in the coating liquid supplying device 3 decreases, the liquid refilling valve 8 is opened and the liquid supplying valve 7 is closed to refill the coating liquid P from the outside.

[0012] [First embodiment] The configuration of the die head 10 according to the first embodiment will be described with reference to FIGS.

[0013] 2, the die head 10 has a first die 20, a second die 30, and a shim plate 40. The first die 20, the second die 30, and the shim plate 40 are configured to be stacked in the thickness direction A. The shim plate 40 is sandwiched between the first die 20 and the second die 30.

[0014] As shown in Figs. 3 and 4, the first die 20 has a storage section 25 and a supply path 22 formed in its internal space. The storage section 25 is a recessed portion that is open on the side facing the shim plate 40. The supply path 22 is formed, for example, in the center of the first die 20, and connects the end of the pipe 6 to the storage section 25. The coating fluid P supplied from the coating fluid supply device 3 is stored in the storage section 25 through the supply path 22. The first die 20 has a plurality of rod holes 24 for inserting the rods 53, 63, and 73. The plurality of rod holes 24 are formed on both sides of the supply path 22 in the longitudinal direction B of the first die 20.

[0015] As shown in Fig. 2, the second die 30 is disposed opposite the first die 20 via the shim plate 40. The second die 30 is configured to cooperate with the first die 20 to sandwich the shim plate 40. As shown in Fig. 5 and Fig. 6, the second die 30 has a substantially flat plate shape, and an inner surface 31 of the second die 30 facing the first die 20 and the shim plate 40 is a flat surface.

[0016] 7 and 8, the shim plate 40 is a flat plate having a communication portion 42 and a plurality of flow paths 45, 46, 47, 48. The communication portion 42 is a through hole that extends in the length direction B of the shim plate 40 and penetrates the shim plate 40 in the thickness direction A. The communication portion 42 is in communication with the storage portion 25. The storage portion 25 of the first die 20 and the communication portion 42 of the shim plate 40 form a storage space 15.

[0017] Each of the multiple flow paths 45, 46, 47, 48 connects the storage space 15 and the discharge port 18, and has an inlet and an outlet for the coating liquid P stored in the storage space 15. The multiple flow paths 45, 46, 47, 48 are arranged in the length direction B and separated by a partition portion 44. The surface of the partition portion 44 is flush with the sculptured surface 41, and has, for example, an inverted triangular shape when viewed from the thickness direction A of the shim plate 40.

[0018] The multiple flow paths 45, 46, 47, 48 in the shim plate 40 include a central flow path 45, a pair of first flow paths 46, 46, a pair of second flow paths 47, 47, and a pair of third flow paths 48, 48. The central flow path 45, the pair of first flow paths 46, 46, the pair of second flow paths 47, 47, and the pair of third flow paths 48, 48 are recesses engraved to a predetermined depth on the engraved surface 41.

[0019] The central flow passage 45 is located at the center of the length direction B of the shim plate 40. The central flow passage 45 has a rectangular shape extending in a height direction C intersecting (e.g., perpendicular to) the length direction B from the inlet 43a to the outlet 43b.

[0020] The pair of first flow paths 46, 46 are outer flow paths located on the outside in the longitudinal direction B of the central flow path 45, sandwiching the partition portion 44. The pair of second flow paths 47, 47 are outer flow paths located on the outside in the longitudinal direction B of the first flow path 46, sandwiching the partition portion 44. The pair of third flow paths 48, 48 are outer flow paths located on the outside in the longitudinal direction B of the second flow path 47, sandwiching the partition portion 44.

[0021] As shown in FIG. 1, the die head 10 does not have a seal in the central flow path 45, and is always in an open state. The multiple outer flow paths including the first flow path 46, the second flow path 47, and the third flow path 48 are switched to an open state or a closed state by seals 55, 65, and 75 driven by actuators 50, 60, and 70 described later. As a result, the discharge width of the coating liquid P flowing out from the central flow path 45 can be changed by setting the discharge width of the coating liquid P flowing out from the central flow path 45 to the minimum coating width and opening the outer flow paths located on the outside of the central flow path 45 in the length direction B in order from the outer flow path closest to the central flow path 45 (i.e., in the order of the first flow path 46, the second flow path 47, and the third flow path 48), or closing the outer flow paths located on the outside of the central flow path 45 in the length direction B in order from the outer flow path farthest from the central flow path 45 (i.e., in the order of the third flow path 48, the second flow path 47, and the first flow path 46).

[0022] The first flow path 46 extends from the inlet 43a to the outlet 43b at an angle with respect to the height direction C. That is, the first flow path 46 has a parallelogram shape that extends at an angle with respect to the height direction C such that the inlet 43a moves away from the central flow path 45 and the outlet 43b moves closer to the central flow path 45.

[0023] The second flow path 47 extends from the inlet 43a to the outlet 43b at an angle with respect to the height direction C. The second flow path 47 has a parallelogram shape that extends at an angle with respect to the height direction C such that the inlet 43a moves away from the first flow path 46 and the outlet 43b moves closer to the first flow path 46.

[0024] The third flow path 48 extends from the inlet 43a to the outlet 43b at an angle with respect to the height direction C. The third flow path 48 has a parallelogram shape that extends at an angle with respect to the height direction C such that the inlet 43a moves away from the second flow path 47 and the outlet 43b moves closer to the second flow path 47.

[0025] In this way, each of the first flow path 46, the second flow path 47, and the third flow path 48 has a parallelogram shape extending at an incline with respect to the height direction C. The inclination angles of the first flow path 46, the second flow path 47, and the third flow path 48 increase with increasing distance from the central flow path 45. That is, the inclination angle of the first flow path 46<the inclination angle of the second flow path 47<the inclination angle of the third flow path 48.

[0026] On the inlet 43a side, the first flow path 46, the second flow path 47, and the third flow path 48 are spaced apart from each other in the longitudinal direction B. On the outlet 43b side, the first flow path 46, the second flow path 47, and the third flow path 48 are close to each other, and the distance between the adjacent outer flow paths 46, 47, 48 in the longitudinal direction B is shortened. This makes it possible to ensure a sufficient sealing allowance for the inlet 43a by the seals 55, 65, 75 on the inlet 43a side, and to prevent vertical streaks associated with the spacing between the flow paths 45, 46, 47, 48 from occurring in the coating pattern on the outlet 43b side.

[0027] In FIG. 9, the seals 55, 65, 75 are enlarged and circled to show the state in which they are incorporated into the storage space 15. The seals 55, 65, 75 are located in the storage space 15 formed by the storage section 25 and the communication section 42, and close the inlet 43a. The shim plate 40 has a sealed section 43c that closes each of the inlets 43a of the outer flow paths 46, 47, 48 by the abutment of the seal. The sealed section 43c protrudes slightly higher than the bottom of the storage section 25. As a result, the bottom surface of the seals 55, 65, 75 abuts against the sealed section 43c, and the seals 55, 65, 75 can reliably block the inlet 43a, thereby preventing leakage of the coating liquid P. The seals 55, 65, 75 are configured so that their side surfaces abut against the inner surface 31 of the second die 30. This makes it possible to prevent the coating fluid P from leaking from the side of the inner surface 31 of the second die 30.

[0028] As shown in Figs. 13 to 16, the die head 10 includes a plurality of actuators 50, 60, and 70 for moving a plurality of seals 55, 65, and 75 to a closed position or an open position. The first actuator 50 includes a first cylinder 51 and a first rod 53, and a first seal 55 is attached to the tip of the first rod 53 driven by the first cylinder 51. The second actuator 60 includes a second cylinder 61 and a second rod 63, and a second seal 65 is attached to the tip of the second rod 63 driven by the second cylinder 61. The third actuator 70 includes a third cylinder 71 and a third rod 73, and a third seal 75 is attached to the tip of the third rod 73 driven by the third cylinder 71. The rods 53, 63, and 73 are inserted into the corresponding rod holes 24 and sealed by packings (not shown).

[0029] In FIG. 9, when the rods 53, 63, 73 are driven upward in the height direction C, the seals 55, 65, 75 move away from the sealed portion 43c and are positioned at the open position. When the rods 53, 63, 73 are driven downward in the height direction C, the seals 55, 65, 75 abut against the sealed portion 43c and are positioned at the closed position. At this time, the seals 55, 65, 75 move in the height direction C while the side surface of the seals 55, 65, 75 on the second die 30 side is in sliding contact with the inner surface 31 of the second die 30. When the seals 55, 65, 75 are in the open position, the coating liquid P is supplied to the corresponding outer flow passages 46, 47, 48. On the other hand, when the seals 55, 65, 75 are in the closed position, the supply of the coating liquid P to the corresponding outer flow passages 46, 47, 48 is blocked.

[0030] The manner of use of the die head 10 will be described with reference to FIGS.

[0031] Prior to the coating step, a pre-coating cleaning step is performed as shown in Figures 10 to 12. As shown in Figure 10, the coating device 1 includes a stage 81 on which a substrate 80 is placed, a stand 82 that supports the stage 81, and a die head 10 that ejects a coating liquid P onto the substrate 80 placed on the stage 81. A priming roller 83 is provided in front of the stage 81 in the transport direction.

[0032] As described above, the die head 10 does not have a seal in the central flow path 45 and is always in an open state. Therefore, as shown in FIG. 11, an appropriate flow rate of the coating liquid P continuously flows out from the outlet 43b of the central flow path 45. However, when the seals 55, 65, and 75 block each inlet 43a, if the blockage continues for a long time, the coating liquid P remaining near the outlet 43b may dry and solidify. Therefore, as shown in FIG. 12, in the pre-coating cleaning process before applying the coating liquid P to the substrate 80, the die head 10 sets all the seals 55, 65, and 75 to the open position and discharges the coating liquid P to the priming roller 83. This adjusts clogging caused by the coating liquid P remaining near the outlet 43b, and optimizes the flow of the coating liquid P. Following this pre-coating cleaning process, the coating process on the substrate 80 is performed. When the coating process is completed, a further pre-coating cleaning process is performed prior to the next coating process. Therefore, the pre-coating cleaning step and the coating step are repeated.

[0033] The coating process will be described with reference to FIGS.

[0034] 13 is a diagram illustrating a coating process using the central flow passage 45. By controlling the pressure of the pressurizing device 4, an appropriate flow rate of the coating liquid P is continuously discharged from the outlet 43b of the central flow passage 45. Then, a coating pattern having a coating width in the length direction B corresponding to the opening width of the outlet 43b of the central flow passage 45 is formed on the substrate 80.

[0035] 14 is a diagram illustrating a coating process that further uses a pair of first flow paths 46, 46. By setting a first seal 55 for the first flow path 46 to an open position using a first actuator 50, the coating liquid P flows out from each outlet 43b in the central flow path 45 and the pair of first flow paths 46, 46. Then, a coating pattern is formed on the substrate 80, the coating pattern having a coating width in the length direction B corresponding to a total opening width obtained by adding up the opening widths of each outlet 43b in the central flow path 45 and the pair of first flow paths 46, 46.

[0036] 15 is a diagram illustrating a coating process that further uses a pair of second flow paths 47, 47. By using the second actuator 60 to further open the second seal 65 for the second flow path 47, the coating liquid P flows out from each of the outlets 43b in the central flow path 45, the pair of first flow paths 46, 46, and the pair of second flow paths 47, 47. Then, a coating pattern is formed on the substrate 80, having a coating width in the length direction B that corresponds to a total opening width obtained by adding up the opening widths of each of the outlets 43b in the central flow path 45, the pair of first flow paths 46, 46, and the pair of second flow paths 47, 47.

[0037] 16 is a diagram illustrating a coating process that further uses a pair of third flow paths 48, 48. By further opening the third seal 75 for the third flow path 48 by the third actuator 70, the coating liquid P flows out from each outlet 43b in the central flow path 45, the pair of first flow paths 46, 46, the pair of second flow paths 47, 47, and the pair of third flow paths 48, 48. Then, a coating pattern having a coating width in the length direction B corresponding to a total opening width obtained by adding up the opening widths of each outlet 43b in the central flow path 45, the pair of first flow paths 46, 46, the pair of second flow paths 47, 47, and the pair of third flow paths 48, 48 is formed on the substrate 80.

[0038] The opening width of the discharge port 18, i.e., the coating width, can be easily changed to a desired one by opening and closing the inlets 43a of the outer flow paths 46, 47, 48 using the actuator-driven seals 55, 65, 75. This allows the coating width to be changed from the minimum coating width using only the central flow path 45 to the coating width using the flow paths 45, 46, the coating width using the flow paths 45, 46, 47, and the maximum coating width using all the flow paths 45, 46, 47, 48.

[0039] [Embodiment 2] A die head 10 according to a second embodiment will be described with reference to FIG.

[0040] 17, the shim plate 40 is characterized in that it further has a junction 49 where the outlet 43b of one flow path joins the outlet 43b of the other flow path in two adjacent flow paths 45, 46: 46, 47: 47, 48. The following mainly describes the differences from the die head 10 according to the first embodiment.

[0041] In the shim plate 40, for example, the outlet 43b of the first flow path 46 and the outlet 43b of the second flow path 47 located next to the first flow path 46 are separated by a partition wall 44, which extends in the height direction C to just before the lower end of the shim plate 40. In other words, the partition wall 44 terminates just before the lower end of the shim plate 40, leaving a joining height T. The region between the end of the partition wall 44 and the lower end of the shim plate 40 serves as a joining section 49. The coating fluid P supplied from the first flow path 46 and the coating fluid P supplied from the second flow path 47 can join in advance at the joining section 49. As a result, the coating fluid P that has joined in advance is discharged from the discharge port 18, so that vertical streaks can be prevented from occurring in the coating pattern. Since the junction 49 is provided on the outlet 43b side of the partition wall 44, it is also provided between the central flow path 45 and the first flow path 46 and between the second flow path 47 and the third flow path .

[0042] Third Embodiment A die head 10 according to a third embodiment will be described with reference to FIG.

[0043] 18, actuators 50, 60, 70 are characterized in that they are configured so that rods 53, 63, 73 can be separated from driving units 51, 61, 71 that drive rods 53, 63, 73. The following mainly describes the differences from die head 10 according to the first embodiment described above.

[0044] The die head 10 is attached to the die holder 12, for example, by bolting. As shown in Fig. 18, the die holder 12 has a plate shape extending in a length direction B and a height direction C. As shown in Fig. 19, the die holder 12 has a stay 14 extending in a thickness direction A. Parts (driving parts) of the actuators 50, 60, 70 are disposed on the stay 14 side. The remaining parts (driven parts) of the actuators 50, 60, 70 are disposed on the die head 10 side.

[0045] The first actuator 50 has a first cylinder 51, a first piston rod 52, and a first rod 53. The first cylinder 51 and the first piston rod 52, which act as a driving part, are disposed on the side of the stay 14. The first rod 53, which acts as a driven part, is disposed on the side of the die head 10. The first piston rod 52 and the first rod 53 are configured separately. A first seal 55 is attached to one end of the first rod 53, a first upper stopper 56 (shown in FIG. 19) is disposed on the other end of the first rod 53, and a first pedestal 57 (shown in FIG. 19) having a through hole is fixed to the upper surface of the first die 20. A first spring 54 sandwiched between the first upper stopper 56 and the first pedestal 57 urges the first seal 55 toward the open position, and a first lower stopper 58 restricts the upward movement amount of the first rod 53. When the first piston rod 52 presses the first rod 53 via the first upper stopper 56, the first seal 55 moves to the closing position and closes the inlet 43a of the first flow passage 46. When the first piston rod 52 stops pressing the first rod 53, the first seal 55 moves to the opening position and the inlet 43a of the first flow passage 46 is opened.

[0046] The second actuator 60 has a second cylinder 61, a second piston rod 62, and a second rod 63. The second cylinder 61 and the second piston rod 62, which act as a driving part, are disposed on the side of the stay 14. The second rod 63, which acts as a driven part, is disposed on the side of the die head 10. The second piston rod 62 and the second rod 63 are configured separately. A second seal 65 is attached to one end of the second rod 63, a second upper stopper 66 (shown in FIG. 19) is disposed on the other end of the second rod 63, and a second pedestal 67 (shown in FIG. 19) having a through hole is fixed to the upper surface of the first die 20. A second spring 64 sandwiched between the second upper stopper 66 and the second pedestal 67 urges the second seal 65 toward the open position, and a second lower stopper 68 restricts the upward movement amount of the second rod 63. When the second piston rod 62 presses the second rod 63 via the second upper stopper 66, the second seal 65 moves to the closing position and closes the inlet 43a of the second flow path 47. When the second piston rod 62 stops pressing the second rod 63, the second seal 65 moves to the opening position and the inlet 43a of the second flow path 47 is opened.

[0047] The third actuator 70 has a third cylinder 71, a third piston rod 72, and a third rod 73. The third cylinder 71 and the third piston rod 72, which act as a driving part, are disposed on the side of the stay 14. The third rod 73, which acts as a driven part, is disposed on the side of the die head 10. The third piston rod 72 and the third rod 73 are configured separately. A third seal 75 is attached to one end of the third rod 73, a third upper stopper 76 (shown in FIG. 19) is disposed on the other end of the third rod 73, and a third pedestal 77 (shown in FIG. 19) having a through hole is fixed to the upper surface of the first die 20. A third spring 74 sandwiched between the third upper stopper 76 and the third pedestal 77 urges the third seal 75 toward the open position, and a third lower stopper 78 restricts the upward movement amount of the third rod 73. When the third piston rod 72 presses the third rod 73 via the third upper stopper 76, the third seal 75 moves to the closing position and closes the inlet 43a of the third flow path 48. When the third piston rod 72 stops pressing the third rod 73, the third seal 75 moves to the opening position and opens the inlet 43a of the third flow path 48.

[0048] Then, for example, the die head 10 can be removed from the die holder 12 by loosening the bolts that secure the die head 10 to the die holder 12. At this time, the actuators 50, 60, 70 can be easily separated between the rods 53, 63, 73 and the drive units 51, 61, 71 that drive the rods 53, 63, 73.

[0049] Therefore, in the actuators 50, 60, 70 of the die head 10, the piston rods 52, 62, 72 and the rods 53, 63, 73 of the cylinders 51, 61, 71 are configured to be separable, which facilitates the disassembly and assembly of the die head 10 and the replacement of the shim plate 40.

[0050] Fourth embodiment A die head 10 according to a fourth embodiment will be described with reference to FIG.

[0051] As shown in Fig. 20, a flow path having a large pressure loss is characterized by being configured to have a short flow path length. The following mainly describes the differences from the die head 10 according to the first embodiment described above.

[0052] In FIG. 20, the opening width in the length direction B of the inlet 43a is wider in the order of the central flow path 45, the first flow path 46, and the second flow path 47. If the flow path length is long, the coating liquid P does not flow easily due to pressure loss. Even if the first seal 55 and the second seal 65 are opened at the same timing, the flow rate of the coating liquid P becomes slower in the flow path with a larger pressure loss, so a time lag occurs in the discharge of the coating liquid P between the central flow path 45, the first flow path 46, and the second flow path 47. Therefore, the flow path with a larger pressure loss is configured to have a shorter flow path length as much as possible, and in FIG. 20, the height of each flow path is configured to be lower in the order of the second flow path 47, the first flow path 46, and the central flow path 45. In other words, the flow path length l of the central flow path 45, the flow path length m of the first flow path 46, and the flow path length n of the second flow path 47 are configured to be equal to each other. This makes it possible to suppress the occurrence of a time lag in the discharge of the coating fluid P among the central flow path 45, the first flow paths 46, and the second flow paths 47.

[0053] Although specific embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention.

[0054] Although not intended to limit the present invention, the junction height T of the junction 49 in the second embodiment is, for example, greater than 0 mm and equal to or less than 5 mm.

[0055] 18, the dispersion protrusions 27 may be disposed in the vicinity of each of the outlets 43b of the flow paths 45, 46, 47, and 48. This can prevent vertical streaks from occurring in the coating pattern due to the coating solution P flowing in a dispersed manner in the vicinity of the outlets 43b.

[0056] As shown in Fig. 19, the through holes of the pedestals 57, 67, 77 may be slightly inclined, and the rods 53, 63, 73 may extend at an angle with respect to a thickness direction A intersecting (for example, perpendicular to) the length direction B so that the actuators 50, 60, 70 side is away from the second die 30 and the seals 55, 65, 75 side is closer to the second die 30. This can prevent the seals 55, 65, 75 from being worn due to sliding contact with the inner surface 31 of the second die 30 when the seals 55, 65, 75 perform opening and closing operations. In addition, a seal structure can be formed in which the seals 55, 65, 75 are pressed against both the inner surface 31 of the second die 30 and the sealed portion 43c by applying a force that presses the seals 55, 65, 75 in an oblique direction.

[0057] The present invention and the embodiments can be summarized as follows.

[0058] The die head 10 according to the present embodiment is A die head 10 that discharges a coating liquid P from a slit-shaped discharge port 18, A first die 20 having a storage section 25 for storing a coating liquid P; A shim plate 40 having a plurality of flow paths 45, 46, 47, 48 provided in a longitudinal direction B, the flow paths 45, 46, 47, 48 connecting the storage portion 25 and the discharge port 18 and having an inlet 43a and an outlet 43b; a second die 30 disposed opposite to the first die 20 and cooperating with the first die 20 to hold the shim plate 40 therebetween; Seals 55, 65, 75 for blocking the inlets 43a of the flow paths 45, 46, 47, 48; and an actuator (50, 60, 70) for moving the seal (55, 65, 75) to a closed position or an open position; The actuators 50, 60, and 70 are used to switch between an open state and a closed state of the flow paths 46, 47, and 48, thereby changing the discharge width of the coating liquid P discharged from the discharge port 18.

[0059] As a result, the seals 55, 65, 75 driven by the actuators 50, 60, 70 open or close the inlets 43a of the multiple flow paths 46, 47, 48, so that the discharge width of the coating fluid P (the coating width of the coating pattern) can be easily changed.

[0060] As in this embodiment, the shim plate 40 has a central flow passage 45 extending in a height direction C intersecting the longitudinal direction B from the inlet 43a to the outlet 43b, and outer flow passages 46, 47, 48 located outside the central flow passage 45 in the longitudinal direction B, and the central flow passage 45 is always in an open state, while the outer flow passages 46, 47, 48 may be opened in order starting from the outer flow passage 46, 47, 48 located closest to the central flow passage 45 among the outer flow passages located outside the longitudinal direction B from the central flow passage 45, or may be closed in order starting from the outer flow passage 46, 47, 48 located farthest from the central flow passage 45 among the outer flow passages located outside the longitudinal direction B from the central flow passage 45.

[0061] This makes it possible to change the discharge width of the coating liquid P flowing out from the central flow path 45 by setting the discharge width to the minimum coating width and opening the outer flow paths 46, 47, 48 located closest to the central flow path 45 among the outer flow paths located outside the central flow path 45 in the longitudinal direction B in sequence, or closing the outer flow paths 48, 47, 46 located farthest from the central flow path 45 among the outer flow paths located outside the central flow path 45 in the longitudinal direction B in sequence.

[0062] The outer flow paths 46 , 47 , 48 may extend at an angle with respect to the height direction C such that the inlets 43 a of the outer flow paths 46 , 47 , 48 are away from the central flow path 45 and the outlets 43 b of the outer flow paths 46 , 47 , 48 are closer to the central flow path 45 .

[0063] This ensures a sufficient sealing margin for the inlet 43a by the seals 55, 65, 75 on the inlet 43a side, while on the outlet 43b side, vertical streaks associated with the separation of the flow paths 45, 46, 47, 48 in the coating pattern can be prevented.

[0064] As in this embodiment, the shim plate 40 may further have a junction portion 49 where the outlet 43b of one of two adjacent flow paths joins with the outlet 43b of the other flow path.

[0065] As a result, the coating liquid P that has joined together in advance is discharged from the discharge port 18, which further prevents vertical streaks from occurring in the coating pattern.

[0066] As in this embodiment, the shim plate 40 further has a sealed portion 43c that closes the inlet 43a of the outer flow passages 46, 47, 48 when the seals 55, 65, 75 abut against it, and the sealed portion 43c may protrude beyond the bottom of the storage portion 25.

[0067] As a result, the bottom surfaces of the seals 55, 65, 75 come into contact with the sealed portion 43c, so that the seals 55, 65, 75 reliably close the inlet 43a, thereby preventing leakage of the coating liquid P.

[0068] As in this embodiment, the actuators 50, 60, 70 have rods 53, 63, 73 connected to the seals 55, 65, 75 and driving units 51, 61, 71 that drive the rods 53, 63, 73, and the rods 53, 63, 73 may extend at an angle with respect to the thickness direction A that intersects the longitudinal direction B so that the actuators 50, 60, 70 side moves away from the second die 30 and the seals 55, 65, 75 side moves closer to the second die 30.

[0069] This prevents the seals 55, 65, 75 from wearing down due to sliding contact with the inner surface 31 of the second die 30 when the seals 55, 65, 75 perform opening and closing operations, and forms a sealing structure in which the seals 55, 65, 75 are pressed against both the inner surface 31 of the second die 30 and the sealed portion 43c.

[0070] As in this embodiment, the rods 53, 63, and 73 and the driving portions 51, 61, and 71 may be configured to be separable.

[0071] This makes it easier to disassemble and assemble the die head 10 and to replace the shim plate 40.

[0072] In another aspect, the coating device 1 includes the die head 10 according to any one of the above embodiments.

[0073] As a result, the plurality of seals 55, 65, 75 driven by the actuators 50, 60, 70 open and close the inlets 43a of the plurality of flow paths 46, 47, 48, so that the discharge width of the discharge port 18 can be easily changed to a desired discharge width. [Explanation of symbols]

[0074] 1... Coating device 3…Coating fluid supply device 4. Pressurizing device 5. Drive unit 6. Piping 7...Liquid supply valve 8...Fluid refill valve 10…Die head 12…Die holder 14...Stay 15…Storage space 18…Discharge port 20…First die 22…Supply route 24…Rod hole 25…Storage section 27…Distributed protrusion 30…Second die 31…Inner 40…Shim plate 41…Sculpture surface 42…Communication part 43a…Entrance 43b…Exit 43c...Sealed part 44...Bulkhead part 45…Central channel (channel) 46...First flow passage (outer flow passage, flow passage) 47...Second flow passage (outer flow passage, flow passage) 48...Third flow passage (outer flow passage, flow passage) 49…Confluence 50...First actuator (actuator) 51...First cylinder (drive unit) 52...First piston rod (piston rod, drive part) 53...First rod (rod, driven part) 54…First spring 55…First seal (seal) 56…First upper stopper 57…First pedestal 58…First lower stopper 60...Second actuator (actuator) 61...Second cylinder (drive unit) 62...Second piston rod (piston rod, drive part) 63...Second rod (rod, driven part) 64…Second spring 65…Second seal (seal) 66…Second upper stopper 67…Second pedestal 68…Second lower stopper 70...Third actuator (actuator) 71...Third cylinder (drive section) 72...Third piston rod (piston rod, drive part) 73...Third rod (rod, driven part) 74…Third spring 75…3rd Seal (Seal) 76…Third top stopper 77…Third pedestal 78…Third lower stopper 80...Base material 81...Stage 82… Mount 83...Priming roller A: Thickness direction B: Length direction C: Height direction P...Coating liquid T: Confluence height l…Length of central channel m: length of first channel n: Length of the second flow path

Claims

1. A die head that discharges a coating liquid from a slit-shaped discharge port, A first die having a storage portion for storing the coating liquid; A shim plate having a plurality of flow paths in a longitudinal direction, the flow paths connecting the storage portion and the discharge port and having an inlet and an outlet; a second die disposed opposite to the first die and configured to sandwich the shim plate therebetween in cooperation with the first die; a seal blocking the inlet of the flow passage; an actuator for moving the seal to a closed position or an open position; The die head changes the discharge width of the coating liquid discharged from the discharge port by switching between an open state and a closed state of the flow path using the actuator.

2. The flow path includes a central flow path located in a central portion of the shim plate and extending in a height direction intersecting the longitudinal direction from the inlet to the outlet, and an outer flow path located outside the central flow path in the longitudinal direction, 2. The die head of claim 1, wherein the central flow passage is always in the open state, and the outer flow passages are opened in sequence starting from the outer flow passages located closest to the central flow passage or closed in sequence starting from the outer flow passages located farthest from the central flow passage.

3. The die head of claim 2 , wherein the outer flow passages extend at an incline with respect to the height direction such that the inlet side of the outer flow passage moves away from the central flow passage and the outlet side of the outer flow passage moves closer to the central flow passage.

4. The die head according to claim 1 , wherein the shim plate further includes a junction portion where the outlet of one of the two adjacent flow paths joins with the outlet of the other flow path.

5. The shim plate further includes a sealed portion that closes the inlet of the outer flow passage when the seal abuts against the sealed portion, The die head according to claim 2 , wherein the sealed portion protrudes beyond a bottom portion of the storage portion.

6. The actuator includes a rod connected to the seal and a drive unit that drives the rod, The die head according to claim 1 , wherein the rod extends at an angle with respect to a thickness direction intersecting the length direction, so that the drive portion side is away from the second die and the seal side is closer to the second die.

7. The die head according to claim 6 , wherein the rod and the drive portion are configured to be separable.

8. A coating device comprising the die head according to any one of claims 1 to 7.

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