JP6441557B2 - Die head and method for producing coated product - Google Patents

Description

  The present invention relates to a die head and a method for producing a coated product.

  As a method for producing a coated product formed by applying a coating solution to a substrate, a method of applying the coating solution on a substrate that is continuously conveyed by a die coater device is used. In such a technique, in order to improve the quality of the coated product, there is a technique in which a plate-like filter member is provided in the die head of the die coater device, and a coating liquid passing through the filter member is discharged from the die head and applied. It is known (for example, refer to Patent Document 1).

JP-A-5-212336

  However, in the method described in Patent Document 1, when the physical properties such as the viscosity of the coating solution are changed during coating, the film thickness of the coated surface becomes non-uniform. At this time, the die head of the die coater device is disassembled into an upper die head and a lower die head, and shims provided between them (to adjust the height of the flow path for flowing the coating liquid) It is necessary to replace the shim with another one, but in order to replace the shim, the die head must be disassembled, cleaned, assembled, adjusted for accuracy, attached to and detached from the die coater body, etc. There was a problem of requiring a lot of labor and time. In addition, since such a shim is formed of a hard metal, there is a problem that the shape cannot be changed by a method other than replacement.

  The problem to be solved by the present invention is to provide a die head capable of easily adjusting the flow of the coating liquid in the flow path, and thereby uniformly coating the coating liquid on the substrate. is there.

  The present invention changes the shape of the cross section perpendicular to the flow direction of the coating liquid in the flow path by using flow path adjusting means that can project into the flow path in the flow path of the coating liquid provided in the die head. The problem is solved by adjusting the flow of the coating liquid in the flow path.

  According to the present invention, since the cross-sectional shape of the flow path of the coating liquid in the die head can be appropriately adjusted using the flow path adjusting means that can project into the flow path, the flow of the coating liquid in the flow path Can be easily adjusted, and the coating solution can be uniformly applied onto the substrate.

FIG. 1 is a configuration diagram illustrating a coating apparatus including a die head according to the present embodiment. FIG. 2 is an exploded perspective view showing the die head of this embodiment. FIG. 3 is a side sectional view showing the die head of the present embodiment. FIG. 4 is a view for explaining a method of adjusting the flow of the coating liquid in the flow path using the die head shown in FIG. FIG. 5 is a top view showing the die head of the present embodiment. FIG. 6 is a top view showing another example of the die head of the present embodiment. FIG. 7 is a top view showing still another example of the die head of the present embodiment. FIG. 8 is a diagram for explaining a method of adjusting the flow of the coating liquid in the flow path using the die head shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram illustrating a coating apparatus 1 including a die head 500 according to the present embodiment. As shown in FIG. 1, a coating apparatus 1 including a die head 500 according to the present embodiment is an apparatus for forming a coating layer 120 by applying a coating liquid 110 on a substrate 800. 110 includes a tank 100 that houses 110, a pipe 200, a pump 300, a three-way valve 400, a die head 500, a backup roller 610, a guide roller 620, and a drying furnace 700.

  In this embodiment, the base material 800 is attached to the coating apparatus 1 in a state of being wound around an unwinding roll (not shown) and continuously fed from the unwinding roll, as shown in FIG. , Transported along the backup roller 610, passed through the drying furnace 700, then transported along the guide roller 620, and then continuously by a take-up roll (not shown) provided through the guide roller 620. Rolled up.

  In this embodiment, while the base material 800 is being transported in this manner, the coating liquid 110 is applied, the coating layer 120 is formed, and the coating layer 120 is dried. That is, first, while the base material 800 passes over the backup roller 610, the coating liquid 110 is applied to the base material 800 by the die head 500, thereby forming the coating layer 120 on the base material 800. The Here, the coating liquid 110 applied by the die head 500 is obtained by supplying the coating liquid 110 in the tank 100 to the die head 500 by the pump 300 through the pipe 200. Next, the base material 800 on which such a coating layer 120 is formed passes over the backup roller 610 and is then transported into the drying furnace 700, and the coating layer 120 is dried in the drying furnace 700. .

  In the present embodiment, the coating liquid 110 and the substrate 800 are not particularly limited, and a desired material can be used according to the type of product manufactured by the coating apparatus 1. For example, when a battery electrode member is manufactured by the coating apparatus 1, a metal foil can be used as the base material 800, and an electrode slurry (a liquid containing an electrode active material) can be used as the coating liquid 110.

  The drying furnace 700 is a drying furnace for drying the coating layer 120 formed on the base material 800 and is not particularly limited, and is a known drying furnace depending on the types of the coating liquid 110 and the base material 800 described above. Can be used.

  The tank 100 is a tank that stores the coating liquid 110, and is connected to the die head 500 via the pipe 200. The pipe 200 is provided with a pump 300 and a three-way valve 400, and the coating liquid 110 discharged from the tank 100 is sent out by the pump 300 and supplied to the die head 500 through the three-way valve 400.

  Here, in the coating apparatus 1, intermittent coating on the base material 800 can be performed by controlling the three-way valve 400 provided in the pipe 200. That is, first, by controlling the three-way valve 400, the flow direction of the coating liquid 110 delivered from the pump 300 can be switched to the die head 500 side or the tank 100 side. Then, while the three-way valve 400 is switched to the die head 500 side, the coating liquid 110 is supplied to the die head 500 and the coating liquid 110 can be applied onto the substrate 800. On the other hand, while the three-way valve 400 is switched to the tank 100 side, the coating liquid 110 is not supplied to the die head 500 and returns to the tank 100, and the coating liquid 110 is not applied onto the substrate 800. Thereby, in this embodiment, intermittent coating can be performed on the base material 800 by controlling the flow direction in the three-way valve 400 at a desired timing.

  The die head 500 is a die head for applying the coating liquid 110 onto the substrate 800, and includes a lower die head 510, an upper die head 520, and a shim 530 as shown in FIG. Here, FIG. 2 is an exploded perspective view showing the die head 500 of the present embodiment. In the present embodiment, the lower die head 510, the upper die head 520, and the shim 530 are each provided with a plurality of bolt holes 511, 521, and 531 and pass through such bolt holes 511, 521, and 531. By passing the bolt in this manner, the lower die head 510 and the upper die head 520 are integrated via the shim 530.

  As shown in FIG. 2, the lower die head 510 of the die head 500 is provided with a coating liquid reservoir 512 and a coating liquid supply port 513. The coating liquid supply port 513 is an opening connected to the pipe 200, and the coating liquid reservoir 512 is a space for storing the coating liquid 110.

  In the present embodiment, the coating liquid 110 supplied through the pipe 200 is stored in the coating liquid reservoir 512 through the coating liquid supply port 513. Then, the coating liquid 110 in the coating liquid reservoir 512 corresponds to the gap between the lower die head 510 and the upper die head 520, that is, the thickness of the shim 530 provided between the lower die head 510 and the upper die head 520. From the gap formed in this way, the ink is discharged in the positive x-axis direction shown in FIG. Specifically, as shown in FIG. 3, which is a side sectional view of the die head 500 shown in FIG. 2 when viewed in the positive y-axis direction, the coating liquid 110 in the coating liquid reservoir 512 is transferred to the lower die head 510. Through the coating liquid flow path 540 that is a gap between the upper die head 520 and the lower die head 510 and the coating lip 550 that is the tip of the upper die head 520, and is discharged toward the positive x-axis direction. It is applied on the material 800.

  Further, in the die head 500 of the present embodiment, as shown in FIG. 3, a flow path adjustment bolt 560 capable of adjusting the flow of the coating liquid 110 in the coating liquid flow path 540 is provided on the lower die head 510. . In the present embodiment, the channel adjustment bolt 560 provided in the lower die head 510 adjusts the protruding height in the coating liquid channel 540 from the state where it is flush with the surface of the lower die head 510. This is possible, and the flow of the coating liquid 110 in the coating liquid channel 540 can be adjusted.

  Specifically, as shown in FIG. 4A, the flow path adjustment bolt 560 is rotated from the state where the flow path adjustment bolt 560 and the surface of the lower die head 510 are flush with each other. As shown in FIG. 4 (B), the channel adjusting bolt 560 can be projected into the coating solution channel 540. The rotation of the flow path adjustment bolt 560 may be performed manually, or may be performed automatically by preparing a control device for controlling the rotation of the flow path adjustment bolt 560. Further, the height at which the flow path adjustment bolt 560 protrudes into the coating liquid flow path 540 can be adjusted by appropriately changing the rotation angle of the flow path adjustment bolt 560.

  In this embodiment, the number and position of the flow path adjustment bolts 560 are not particularly limited, and one or more flow path adjustment bolts 560 can be provided at a desired position.

  Here, FIG. 5 is a top view when the lower die head 510a is viewed in the negative z-axis direction. In this embodiment, for example, as shown in FIG. 5, a plurality of flow path adjustment bolts 560a, 560b, 560c, and 560d are provided on the lower die head 510a, and the coating liquid 110 is actually made by projecting these bolts. The shape of the flow path that can flow to the coating liquid, that is, the shape of the cross section (yz plane) perpendicular to the flow direction of the coating liquid 110 from the coating liquid reservoir 512 through the coating liquid path 540 in the positive x-axis direction. Can be changed. Accordingly, in the lower die head 510a shown in FIG. 5, the flow rate of the coating liquid 110 can be reduced at the portions where the channel adjusting bolts 560a, 560b, 560c, and 560d are projected, respectively. The flow of the coating liquid 110 in 540 can be adjusted.

  In FIG. 2 described above, the flow path adjusting bolt is not shown for convenience of explanation, but the die head 500 shown in FIG. 2 is similar to the lower die head 510a shown in FIG. The side die head 510 is provided with a channel adjusting bolt.

  In the present embodiment, in order to adjust the flow of the coating liquid 110 in the coating liquid flow path 540, such a channel adjusting bolt that can protrude into the coating liquid flow path 540 is used. 110 flow can be easily adjusted, so that even if the physical properties such as the viscosity of the coating liquid 110 change during the coating, without changing the shim 530 of the die head 500, The flow of the coating liquid 110 can be adjusted as appropriate. Thereby, the coating liquid 110 can be uniformly coated on the substrate 800.

  That is, when physical properties such as the viscosity of the coating liquid 110 change during coating, the die head 500 is usually disassembled in order to adjust the flow of the coating liquid 110 in the coating liquid flow path 540. The shim 530 needs to be replaced with another shape. In this case, the die head 500 must be disassembled, cleaned, assembled, adjusted in precision, attached to and detached from the coating apparatus 1, and the like. It takes a lot of effort and time. Moreover, since the shim 530 used for the die head 500 is formed of a hard metal, the shape cannot be changed by a method other than replacement. On the other hand, in the present embodiment, the flow of the coating liquid 110 in the coating liquid flow path 540 can be easily adjusted without replacing the shim 530 of the die head 500. 800 can be uniformly applied.

  In particular, according to the present embodiment, the flow of the coating liquid 110 in the coating liquid channel 540 can be easily adjusted without replacing the shim 530 of the die head 500, and the coating liquid 110 can be evenly distributed on the substrate 800. When the battery electrode member is manufactured by the coating apparatus 1, the following effects can be obtained. That is, when a metal foil is used as the substrate 800 and an electrode slurry (liquid containing an electrode active material) is used as the coating liquid 110 to produce an electrode member formed by applying the electrode slurry to the metal foil, the shim 530 is used. By eliminating the need for replacement, the production efficiency of the electrode member can be improved. In addition, since the obtained electrode member is obtained by uniformly applying the electrode slurry, when used as an electrode of a secondary battery, the electrode active material acts effectively and stably charges and discharges. And the quality is excellent.

  In the case where the physical properties such as the viscosity of the coating liquid 110 have changed during the coating, the amount of the coating liquid discharged from the die head 500 is usually the both ends from the central portion in the width direction of the die head 500. The part tends to increase. On the other hand, as shown in FIG. 5, flow path adjusting bolts 560a, 560b, 560c, and 560d are provided in the vicinity of both ends in the width direction of the lower die head 510a, and these flow path adjusting bolts are respectively protruded. The flow rate of the coating liquid 110 in the vicinity of both ends in the width direction of the coating liquid flow path 540 can be reduced, whereby the coating liquid 110 can be coated on the substrate 800 with a uniform thickness.

  In the present embodiment, as described above, the number and installation positions of the flow path adjustment bolts are not particularly limited, and one or more flow path adjustment bolts can be provided at desired positions. For example, in the lower die head 510a shown in FIG. 5 described above, an example in which four flow path adjustment bolts 560a to 560d are provided is shown. In this embodiment, the lower die head 510b shown in FIG. As described above, a configuration may be adopted in which four flow path adjustment bolts 560e, 560f, 560g, and 560h are further provided.

  In this embodiment, the flow rate of the coating liquid 110 in the vicinity of both ends in the width direction of the coating liquid flow path 540 can be finely controlled by arranging the flow path adjusting bolts as shown in FIG. In addition, the flow of the coating liquid 110 in the coating liquid channel 540 can be adjusted more appropriately.

  Alternatively, in the present embodiment, in addition to the flow path adjusting bolts 560a to 560h shown in FIG. 6A described above, a lower die head 510c is further provided as in the lower die head 510c shown in FIG. 6B. It is good also as a structure which provided the bolts 560i, 560j, and 560k for flow path adjustment in the center vicinity of the width direction. By arranging the flow path adjusting bolt as shown in FIG. 6B, the flow rate of the coating liquid 110 near the center in the width direction can be controlled in addition to the vicinity of both ends in the width direction of the coating liquid flow path 540. In addition, the flow of the coating liquid 110 in the coating liquid channel 540 can be adjusted more appropriately.

  In the example shown in FIGS. 5, 6 </ b> A, and 6 </ b> B described above, a plurality of flow path adjustment bolts are arranged so as to be symmetrical with respect to the center of the coating liquid flow path 540. doing. Therefore, the flow of the coating liquid 110 in the coating liquid channel 540 can be adjusted not only locally but also in a well-balanced manner as a whole, whereby the coating liquid 110 can be applied more uniformly on the substrate 800. Can do.

  In the example shown in FIGS. 5, 6A, and 6B described above, an example in which the flow path adjusting bolt is provided in the lower die head is shown. However, in the present embodiment, the flow path adjustment is performed. The installation position of the bolt for use is not particularly limited, and may be provided in the upper die head 520, or may be provided in both the lower die head and the upper die head 520. In this case, the flow path adjusting bolt is disposed so as to be flush with the surface of the upper die head 520 and protrudes into the coating liquid flow path 540 in accordance with the rotation of the flow path adjusting bolt.

  Furthermore, in the present embodiment, as in the lower die head 510d shown in FIG. 7A, instead of the channel adjustment bolts, the channel adjustment members 570a and 570b may be provided. The flow path adjusting members 570a and 570b have a quadrangular prism shape that can protrude into the coating liquid flow path 540, and such a quadrangular prism shape portion is flush with the surface of the lower die head 510d. By projecting into the coating liquid channel 540 from the above state, the shape of the cross section perpendicular to the flow direction of the coating liquid 110 in the coating liquid channel 540 is changed, and the coating liquid 110 in the coating liquid channel 540 is changed. The flow can be adjusted.

  7A shows an example in which the shape of the portion that can project into the coating liquid channel 540 is a quadrangular prism shape for the channel adjusting member, but such a coating liquid channel 540 is shown. The shape of the portion that can project inward is not particularly limited, and may be a triangular prism shape or a cylindrical shape, for example, as in the flow path adjusting members 580a and 580b shown in FIG.

  Here, FIGS. 8A and 8B illustrate a method for adjusting the flow of the coating liquid 110 in the coating liquid flow path 540 using the lower die head 510d shown in FIG. 7A. FIG. In the present embodiment, first, the flow path adjusting member 570a provided in the lower die head 510d includes a protrusion 571 that protrudes into the coating liquid flow path 540 and a protrusion, as shown in FIG. It is comprised from the screw part 572 for pushing up 571. FIG. Then, as the screw portion 572 rotates, as shown in FIG. 8B, the screw portion 572 pushes up the protruding portion 571 to generate a space 590 between the protruding portion 571 and the lower die head 510d. However, the protruding portion 571 is protruded into the coating liquid channel 540. Here, the height at which the protruding portion 571 protrudes into the coating liquid channel 540 can be adjusted according to the rotation angle of the screw portion 572. 7B can also project the triangular prism-shaped projecting portion into the coating liquid flow channel 540 by the same method for the flow path adjusting members 580a and 580b of the lower die head 510e shown in FIG. 7B.

  In the present embodiment, the projecting portion that projects into the coating liquid channel 540 has a cylindrical shape, a triangular prism shape, a quadrangular prism shape, or the like, so that the coating solution 110 is contained in the coating solution channel 540. Even when it hits the protrusion, the coating liquid 110 does not get caught by the protrusion, and the flow of the coating liquid 110 can be made smooth.

  In particular, the following effects can be achieved by forming the protruding portion that protrudes into the coating liquid channel 540 into a shape constituted by a surface such as a triangular prism shape or a quadrangular prism shape. That is, when the projecting portion that projects into the coating liquid flow path 540 has a triangular prism shape or a quadrangular prism shape, the coating liquid 110 flowing through the coating liquid flow path 540 collides with the planar portion of the projecting portion. In this case, the coating liquid 110 can be satisfactorily separated without being caught by the projecting portion, whereby the flow of the coating liquid 110 in the coating liquid channel 540 becomes good, and the coating liquid 110 is used as the base material. 800 can be applied more uniformly.

  As mentioned above, although embodiment of this invention was described, these embodiment was described in order to make an understanding of this invention easy, and was not described in order to limit this invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  For example, in the above-described example, the flow path adjustment bolt and the flow path adjustment member are previously installed in the lower die head or the upper die head 520, and only the protrusion height can be adjusted. The flow path adjusting member may be configured to be adjustable not only in the protruding height but also in the protruding position. Specifically, a mechanism that can move in the width direction of the lower die head and the upper die head 520 is provided for the flow path adjustment bolt and the flow path adjustment member, and either or both of the protruding position and the protruding height are provided. It is good also as a structure which can adjust.

  Thereby, about the flow-path adjustment bolt and the flow-path adjustment member, by setting it as the structure which can adjust both a protrusion position and protrusion height, or any one, it is the coating liquid 110 in the middle of coating. Even when the physical properties such as the viscosity of the coating liquid have changed, the flow of the coating liquid 110 can be finely adjusted for each position in the width direction of the coating liquid flow path 540, and the coating liquid 110 can be more easily adjusted on the substrate 800. It can be applied uniformly.

  In the above-described embodiment, the coating liquid channel 540 is the channel of the present invention, the coating lip 550 is the coating lip of the present invention, the channel adjusting bolts 560, 560a to 560k, and the channel adjusting member. 570a, 570b, 580a, 580b are the flow path adjusting means and the protruding mechanism of the present invention, the protruding portion 571 is the protruding portion of the present invention, the flow adjusting bolts 560, 560a to 560k, and the threaded portion 572 are of the present invention. It corresponds to each bolt.

DESCRIPTION OF SYMBOLS 100 ... Tank 110 ... Coating liquid 120 ... Coating layer 200 ... Pipe 300 ... Pump 400 ... Three-way valve 500 ... Die head 510 ... Lower die head 520 ... Upper die head 530 ... Shim 540 ... Coating liquid flow path 550 ... Coating lip 560, 560a to 560k ... flow path adjusting bolts 570a, 570b, 580a, 580b ... flow path adjusting member 571 ... projecting portion 572 ... screw portion 700 ... drying furnace 800 ... base material

Claims (6)

A flow path through which the coating liquid flows;
A coating lip for discharging the coating liquid flowing through the flow path;
Protruding into the flow path, the flow path adjusting means for changing the shape of the cross section perpendicular to the flow direction of the coating liquid in the flow path, and adjusting the flow of the coating liquid in the flow path,
The flow path adjusting means is composed of protruding mechanisms provided only at both ends in the width direction of the flow path,
The projecting mechanism, the Migihitsuji suited to the center in the width direction of the downstream as the flow path of the flow direction is parallel to the flow direction, and has an inclined surface inclined with respect to a vertical plane, the upper surface A die head characterized by having a triangular protrusion as viewed . The die head according to claim 1,
The die head is composed of an upper die head and a lower die head,
The flow path adjusting means is provided on at least one of the upper die head and the lower die head, and includes one or two or more protruding mechanisms that can adjust a protruding position or a protruding height in the flow path. Die head characterized by The die head according to claim 1 or 2,
The flow path adjusting means includes a plurality of protruding mechanisms, and the plurality of protruding mechanisms are arranged symmetrically with respect to the center of the flow path. In the die head according to any one of claims 1 to 3,
The protrusion mechanism includes a protrusion that can adjust the protrusion height in the flow path,
The die head according to claim 1, wherein the protrusion has a protrusion height adjustable by a bolt. In the die head according to any one of claims 1 to 4,
The die head according to claim 1, wherein the protrusion mechanism includes a triangular prism-shaped protrusion having an adjustable protrusion height in the flow path. A method for producing a coated product by applying a coating liquid onto a substrate by a die head having a flow path through which the coating liquid flows and a coating lip for discharging the coating liquid flowing through the flow path Because
The Migihitsuji suited to the center in the width direction of the downstream as the flow path of the coating liquid flow direction of the flow path is parallel to the flow direction, and has an inclined surface inclined with respect to a vertical plane, Using a flow path adjusting means that is provided with a protruding mechanism that is provided only at both ends in the width direction of the flow path, and that has a triangular protrusion in a top view, and that can protrude into the flow path. A flow path adjusting step for adjusting the flow of the coating liquid in
And a coating step of applying the coating liquid onto the substrate to obtain a coated product after the flow path adjusting step.

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