WO2020085088A1

WO2020085088A1 - Multi-layer coating device

Info

Publication number: WO2020085088A1
Application number: PCT/JP2019/039765
Authority: WO
Inventors: 敦渡邉; 賢司北島
Original assignee: 東レエンジニアリング株式会社
Priority date: 2018-10-23
Filing date: 2019-10-09
Publication date: 2020-04-30
Also published as: JP7028749B2; JP2020065963A

Abstract

The present invention forms a multi-layer coating layer with high flatness on a substrate by using a multi-layer die. Specifically, provided is a multi-layer coating device for applying a slurry to a base material simultaneously in multiple layers, wherein the device is characterized by comprising: a die having a discharge port for discharging the slurry to the base material, and a plurality of flow paths long in the width direction for supplying the slurry to the discharge port, and formed so that slurry is discharged in a layer form from the discharge port to the surface of the base material through each flow path; and a plurality of supply means for supplying the slurry to each of the plurality of flow paths. The device is also characterized in that a plurality of adjustment units for adjusting the discharge amount of the slurry from the discharge port by causing the slurry to flow out or flow in are provided in at least one of the flow paths, across the width direction.

Description

Multi-layer coating device

The present invention relates to a multilayer coating device for manufacturing a battery electrode plate by coating a base material with a slurry containing an active material.

For example, as in Patent Document 1, a battery electrode plate is manufactured by coating a roll-to-roll base material with a slurry containing an active material, a binder, a conductive additive and a solvent. In the battery electrode plate thus produced, the thickness of the layer containing the active material formed on the base material directly affects the amount of charge and discharge of the battery, and therefore, particularly in a high-capacity battery ( In the case of a battery), it is very important to control the film thickness of the slurry applied to the base material. That is, the slurry needs to be applied with a uniform thickness along the width direction and the feed direction of the base material.

Further, as shown in Patent Document 2, the binder is unevenly distributed in the process in which the binder floats on the coating film surface together with the solvent in the drying step after the slurry is applied to the base material, so that the binder is diluted in a thin portion. In order to prevent the decrease of the binding force between the coating film and the base material and the binding force, increase the binder content in the layer close to the base material so that the binder is evenly distributed in the coating film after drying. Then, a technique for reducing uneven distribution of the binder in the drying step and ensuring the binding force of the slurry coating film after drying by a method of applying the slurry in multiple layers on a substrate at once using a multilayer die has been disclosed. There is.

JP, 11-233102, A Japanese Patent Laid-Open No. 11-339772

However, as shown in Patent Document 2, when a layer of slurry is laminated on a substrate using a multilayer die, the distribution of the slurry in the width direction may differ for each layer in the flow path. There is a possibility that it may be difficult to adjust the width-direction film thickness distribution of the above-mentioned multi-layered slurry to a uniform thickness.

The present invention has been made in view of the above problems, and an object thereof is to form a multi-layer coating layer having high flatness on a substrate by using a multi-layer die.

To solve the above problems, the multi-layer coating apparatus of the present invention is a multi-layer coating apparatus for simultaneously applying a slurry to a base material in multiple layers, and a discharge port for discharging the slurry to the base material and the discharge port. A plurality of flow paths that are long in the width direction and that supply the slurry, and are formed so that the slurry is discharged in layers from the discharge ports to the surface of the base material through the respective flow paths. An adjusting unit that includes a die and a plurality of supply units that respectively supply the slurry to the plurality of flow paths, and adjusts the discharge amount of the slurry from the discharge port by causing the slurry to flow out or flow in at least, It is characterized in that a plurality of channels are provided in one of the flow paths in the width direction.

By doing so, by adjusting the discharge amount of the slurry of at least one layer in the width direction by the adjusting unit, the thickness distribution in the width direction of the entire multilayer film applied to the base material can be adjusted without stopping the production operation. .

Also, the adjusting unit may be provided in only one of the flow paths.

The total thickness of the multi-layered slurry can be adjusted with a simple structure without providing adjustment parts in all the flow paths.

The adjusting unit may adjust the discharge amount of the slurry from the discharge port by causing the slurry to flow out from the flow path that supplies the slurry of the layer in contact with the surface of the base material.

By doing this, the thickness distribution of the entire layer can be adjusted in the direction of reducing the thickness of the layer in contact with the surface of the base material.

Also, the adjusting section may be provided in each of the flow paths for supplying two layers of slurry.

-By adjusting the thickness distribution of the two layers in the width direction of the slurry, the thickness distribution adjustment that takes into account the thickness distribution adjustment of the other side can be performed, improving the overall thickness distribution adjustment function. In addition, since it is possible to select and adjust only one of the layers or both of the layers, it is possible to adjust depending on the slurry and coating conditions.

Further, the arrangement of the adjusting part in each of the flow paths for supplying the two layers of slurry may be shifted in the width direction between the one flow path and the other flow path.

By shifting the arrangement of each adjustment part in the width direction between the two layers, the adjustment position in the width direction increases, so fine adjustment is possible.

Also, the adjusting section may be provided in each of the flow paths that supply the slurry of two adjacent layers.

The thickness distribution in the width direction of the entire layer can be adjusted while changing the balance of the outflow or inflow of the slurry from the adjustment unit between adjacent layers. By doing so, the interface between the adjacent layers can be formed into a wavy surface instead of a flat surface, so that the contact area at the interface is increased and the adhesion between the layers is improved.

According to the present invention, a multi-layer die can be used to form a multi-layer coating layer with high flatness on a substrate.

It is a figure explaining the multilayer coating device of Example 1 of this invention. It is a figure explaining the multilayer die of Example 1 of this invention. It is a figure explaining the multilayer die of Example 1 of this invention. It is a figure explaining the multilayer die of Example 1 of this invention. It is a figure explaining the multilayer coating device of Example 2 of this invention. It is a figure explaining the multilayer coating device of Example 2 of this invention. It is a figure explaining the multilayer coating device of Example 3 of this invention. It is a figure explaining another form of the multilayer die used for the multilayer coating device of the present invention.

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

FIG. 1 is an explanatory diagram showing a schematic configuration of the multi-layer coating apparatus of this embodiment. The multi-layer coating apparatus 1 is an apparatus for applying a slurry 3 containing an active material, a binder, a conductive additive and a solvent to a base material 2 made of a metal foil that is fed by roll-to-roll. According to this multi-layer coating device, a layer containing an active material is formed on the base material 2 by drying the applied slurry 3, and the base material 2 is cut into a predetermined shape to form a battery electrode plate. Since the thickness of the layer containing the active material formed on the base material 2 directly affects the charge / discharge amount of the battery, it is very important to control the film thickness of the slurry 3 applied to the base material 2, According to this multilayer coating apparatus 1, as described in the following embodiments, the slurry 3 has a uniform thickness of the entire coating film along the feed direction and the width direction of the base material 2, that is, The total coating amount of each layer is applied in a multilayered manner with a uniform coating amount. The width direction of the base material 2 is a direction orthogonal to the feeding direction of the base material 2, and is the Y-axis direction in FIG. 1.
The multi-layer coating apparatus 1 includes a multi-layer die 10 configured to be long along the width direction of the base material 2, and a supply unit 30 that supplies the slurry 3 to the multi-layer die 10. The longitudinal direction of the multilayer die 10 is referred to as the width direction. In the multi-layer coating apparatus 1, the roller 5 facing the multi-layer die 10 in the horizontal direction, that is, the X-axis direction in FIG. Is. The base material 2 is guided by the roller 5, the gap (gap) between the base material 2 and the multilayer die 10 (ejection port 20 described later) is kept constant, and the slurry 3 is applied in this state.

An example of the multilayer die 10 of this embodiment will be described with reference to FIGS. 2 and 3. FIG. 2A is a sectional view orthogonal to the width direction of the multilayer die 10 as seen from the feeding direction of the base material 2. FIG. 2 (B) shows a view on arrow c of FIG. 2 (A). Further, FIG. 3A shows a view of the arrow a in FIG. Further, FIG. 3B shows a view from the arrow b of FIG. 2A.

The multilayer die 10 of this embodiment applies the slurry 3 to the base material 2 in a two-layer state. The multi-layer die 10 includes a first divided body 13 having a tapered first lip 13a and a second divided body 14 having a tapered second lip 14a, and a first divided body 13 side between them. From the configuration in which the first shim plate 15, the second shim plate 16 on the second divided body 14 side, and the partition plate 17 located between the first shim plate 15 and the second shim plate 16 are sandwiched and combined. Become.

Here, in the present embodiment, the first shim plate 15 and the second shim plate 16 have a uniform thickness having a concave cutout portion that is long in the width direction of the multilayer die 10 as shown in FIG. 4 (A). It is a flat plate, and the outer dimension in the width direction of the flat plate is equal to the dimension in the width direction of the multilayer die 10. The outer dimension in the height direction of the flat plate is equal to the outer dimension in the height direction of the multilayer die 10. Here, the height direction of the multilayer die 10 refers to the X-axis direction in FIG.

Further, the partition plate 17 is a flat plate having a uniform thickness having outer dimensions equal to the dimensions in the width direction and the height direction of the multilayer die 10 as shown in FIG. 4 (B).

As shown in FIG. 2A, the first divided body 13 has a long opening in the width direction of the multilayer die 10 on the inner surface when combined as the multilayer die 10, and a direction orthogonal to the width direction. Has a semicircular indentation. The opening dimension is equal to the dimension between the sides on both sides of the concave cutout portion of the first shim plate 15 in the width direction, that is, the dimension W shown in FIG. 4A, and the height direction is the first shim plate. The size is smaller than the size in the height direction of the concave cutout portion of 15, that is, the size L in FIG. Further, the position of the opening in the height direction coincides with the position of the bottom of the concave cutout portion of the first shim plate 15.

By combining the first divided body 13 having the recess that is elongated in the width direction, the first shim plate 15, and the partition plate 17, the recess having the opening provided in the first divided body 13 has the first shim. It is partially closed by the partition plate 17 with the plate 15 interposed therebetween, and the first manifold 11 which is a space for storing the slurry 3 is formed.

Further, since the first shim plate 15 is sandwiched between the first divided body 13 and the partition plate 17, a gap is formed between the first divided body 13 and the partition plate 17 to connect with the first manifold 11. This gap is called the first slit 18.

Similarly, the second divided body 14 has a semicircular cross-section in a direction orthogonal to the width direction with a long opening in the width direction of the multilayer die 10 on the inner surface when combined as the multilayer die 10. A hollow is provided. The opening dimension is equal to the dimension between the sides on both sides of the concave cutout portion of the second shim plate 16, that is, the dimension W shown in FIG. The size is smaller than the size L of FIG. 4 in the height direction of the concave cutout portion of the two shim plate 16. Further, the position of the opening in the height direction coincides with the position of the bottom of the concave cutout portion of the second shim plate 16.

By combining the second divided body 14 having the recess that is elongated in the width direction, the second shim plate 16, and the partition plate 17, the recess having the opening provided in the second divided body 14 has the second shim. The second manifold 12 which is a space for storing the slurry 3 is formed by being partially closed by the partition plate 17 with the plate 16 interposed therebetween.

Further, since the second shim plate 16 is sandwiched between the second divided body 14 and the partition plate 17, a gap is formed between the second divided body 14 and the partition plate 17 for connecting to the second manifold 12. This gap is called the second slit 19.

Here, the first slit 18 and the second slit 19 are formed parallel to the height direction of the multilayer die 10 with the partition plate 17 interposed therebetween. The first shim plate 15 and the second shim plate 16 have a concave shape, and the ends of the first slit 18 and the second slit 19 on the side opposite to the side communicating with the first manifold 11 and the second manifold 12, respectively. It becomes an opening. This opening is called a discharge port 20. The slurry supplied to the first manifold 11 and passed through the first slit 18 and the slurry supplied to the second manifold 12 and passed through the second slit 19 are discharged from the discharge port 20. The discharge port 20 is arranged so as to face the base material 2.

The first manifold 11 and the second manifold 12 can store the slurry 3 respectively supplied from the supply means 30, and the first slits 18 and the second slits 19 can be stored in the first manifold 11 and the second manifold 12, respectively. The slurry 3 thus prepared can be discharged onto the base material 2 sent by roll-to-roll, and the slurry 3 can be continuously applied to the base material 2 in two layers. Here, the flow path of the slurry from the first manifold 11 through the first slit 18 to the discharge port 20 is referred to as a first flow path. The flow path of the slurry from the second manifold 12 to the discharge port 20 through the second slit 19 is called a second flow path.

Here, the widthwise dimension of the first slit 18 is determined by the inner dimension W of the concave cutout portion of the first shim plate 15 shown in FIG. 4A is determined by the inner size W of the concave cutout portion of the second shim plate 16 shown in FIG. As described above, in the present embodiment, the first shim plate 15 and the second shim plate 16 have the same shape, and thus the widthwise dimension of the first slit 18 and the widthwise dimension of the second slit 19 are the same. . Further, the thickness dimension of the slit is determined by the thickness dimension of the shim plate, but in the present embodiment, the first shim plate 15 and the second shim plate 16 have the same thickness, and the first slit 18 and the second slit 19 are the same. Since the dimension in the thickness direction in the direction orthogonal to the dimension in the width direction of each slit is the same, the cross sections of the flow paths of the first slit 18 and the second slit 19 have the same shape.

Further, the multilayer die 10 has a first inflow portion 23 for supplying the slurry 3 to the first flow path 21 and a second inflow portion 24 for supplying the slurry 3 to the second flow path 22. The portion 23 is provided so as to communicate with the first manifold 11 at the center portion in the width direction of the surface of the first divided body 13 opposite to the surface to be combined with the second divided body 14, and the second inflow portion 24. Is provided so as to communicate with the second manifold 12 at the center portion in the width direction of the surface of the second divided body 14 opposite to the surface to be combined with the first divided body 13.

In the present embodiment, as shown in FIG. 1, the supply means 30 includes a first supply means 31 for supplying the slurry 3 to the first flow path 21 via the first inflow part 23 and a second inflow part 24. And a second supply means 32 for supplying the slurry 3 to the second flow path 22, and the slurry 3 supplied by the first supply means 31 first passes through the first inflow portion 23 and then the first manifold. It is stored in 11, and then discharged from the discharge port 20 through the first slit 18. The slurry 3 supplied by the second supply means 32 is accumulated in the second manifold 12 via the second inflow portion 24, and then discharged from the discharge port 20 through the second slit 19.

The first supply means 31 has a first inflow pipe 33 whose one end is connected to the first inflow part 23 shown in FIG. 3 (A), and, as shown in FIG. It has a tank 35 and a pump (not shown) for supplying the slurry 3 in the first tank 35 to the multilayer die 10 through the first inflow pipe 33. As described above, the first supply means 31 can supply the slurry 3 to the first manifold 11 from the first inflow portion 23.

Similarly, the second supply means 32 stores the second inflow pipe 34 whose one end is connected to the second inflow part 24 shown in FIG. 2A, and the slurry 3 as shown in FIG. It has a second tank 36 and a pump (not shown) for supplying the slurry 3 in the second tank 36 to the multilayer die 10 through the second inflow pipe 34. As described above, the second supply unit 32 can supply the slurry 3 to the second manifold 12 from the second inflow section 24.

In this way, the slurry 3 supplied to the first inflow portion 23 via the first flow path 21 and the slurry 3 supplied to the second inflow portion 24 via the second flow path 22 are layered from the discharge port 20. By discharging the slurry 3 onto the surface of the base material 2, it is possible to apply two layers of the slurry 3 having substantially the same width dimension as the width dimension of the first slit 18 and the second slit 19.

The multilayer die 10 is also provided with a pressure sensor (not shown), and this pressure sensor measures the internal pressure of the slurry 3 in each of the first manifold 11 and the second manifold 12. Then, the supply of the slurry 3 by the first supply means 31 or the second supply means 32 is controlled based on the measurement result, and the internal pressures of the slurry 3 in the first manifold 11 and the second manifold 12 are kept constant. . The slurry 3 having a constant internal pressure in the first manifold 11 and the second manifold 12 is discharged from the discharge port 20 through the first slit 18 and the second slit 19 over the entire width direction, and the pressure sensor The amount of the slurry 3 discharged from the discharge port 20 is controlled so as not to change, and the thickness of the coating film in the feed direction of the base material 2 of the slurry 3 applied on the base material 2 is controlled based on the measurement result of Be constant. Although not shown, a filter for the slurry 3 is provided in the middle of the first inflow pipe 33 and the second inflow pipe 34.

The second flow path 22 of the multi-layer die 10 is an adjusting unit that causes the slurry 3 to flow out of the multi-layer die 10 on the surface of the second split body 14 that forms the second slit 19 and is combined with the first split body 13.

Outflow portions

41, 42, 43, 44 are provided in the width direction. As shown in FIG. 2 (B), the

outflow portions

41, 42, 43, and 44 are through holes that connect the second slit 19 and the outside of the multilayer die 10, and

outflow pipes

51 and 52 that are connected to the through holes. , 53, 54. The slurry 3 that has flowed out from these

outflow portions

41, 42, 43, 44 is returned to the recovery tank 37. It is preferable that a filter (not shown) is provided on the way to the recovery tank 37.

Further, in the present embodiment, each of the

outflow portions

41, 42, 43, 44 is provided with adjusting means for adjusting the discharge of the slurry 3 to be outflowed from the

outflow portions

41, 42, 43, 44. More specifically, as shown in FIG. 2B,

valves

61, 62, 63 and 64 are connected to the

outflow pipes

51, 52, 53 and 54 as the adjusting means. Each of these

valves

61, 62, 63, 64 has a function of adjusting the flow rate of the slurry 3 flowing out from each of the

outflow portions

41, 42, 43, 44. The

valves

61, 62, 63, 64 may adjust the pressure of the slurry 3 flowing out from the

outflow portions

41, 42, 43, 44, respectively. Alternatively, a device (for example, a pump) for controlling the flow rate of the slurry 3 (adjusting the outflow amount) may be provided in the middle of the pipe for returning the slurry 3 from the

outflow portions

41, 42, 43, 44 to the recovery tank 37. In this case, this device functions as an adjusting means for adjusting the discharge of the slurry 3 which is caused to flow out from the

outflow portions

41, 42, 43, 44.

In this way, the multilayer die 10 is provided with the

outflow portions

41, 42, 43, 44 for allowing the slurry 3 in the second flow path 22 to flow out of the multilayer die 10 from the second slits 19 other than the discharge port 20. Therefore, the flow rate distribution in the width direction of the slurry 3 passing through the second flow path 22 can be adjusted.

The multi-layer coating apparatus 1 also includes a sensor 71 that measures the layer thickness of the entire slurry 3 applied on the base material 2 (see FIG. 1). Here, a plurality of sensors 71 may be provided along the width direction. The sensor 71 is a non-contact type and can measure the film thickness of the slurry 3 on the base material 2 at a plurality of positions along the width direction or over the entire length in the width direction. The measurement result is a multilayer coating device. 1 is output to the control device (computer) 72 included in the computer 1. The control device 72 performs feedback control based on the measurement result from the sensor 71 and adjusts the opening degrees of the

valves

61, 62, 63, 64. That is, the control device 72 outputs a control signal to each of the

valves

61, 62, 63, 64 in accordance with the measurement result of the film thickness of the entire layer of the slurry 3, and each of the

valves

61, 62, 63, 64 is output. Adjust the opening of. This makes it possible to keep the thickness of the entire layer of the slurry 3 constant in the width direction. In addition, even if the flow rate distribution of the slurry 3 discharged from the discharge port 20 fluctuates due to the retention of the slurry 3 in the first flow passage 21 or the second flow passage 22 during production, etc., by the above feedback control. It is possible to keep the film thickness of the entire layer of the slurry 3 constant not only in the width direction but also in the feed direction of the base material 2 without stopping the operation of the multilayer coating apparatus 1.

As described above, the multi-layer die 10 is provided with the

outflow portions

41, 42, 43, 44 that allow the slurry 3 in the second flow path 22 to flow out of the multi-layer die 10 from other than the discharge port 20, Even if the flow rate distribution in the width direction of the slurry 3 in the first channel 21 or the second channel 22 varies, the thickness distribution in the width direction of the entire layer of the slurry 3 applied to the base material 2 varies. By adjusting the distribution of the slurry 3 in the width direction of the flow path 22, the film thickness of the entire layer of the slurry 3 can be adjusted to be constant in the width direction. In this way, the film thickness of the entire multilayer can be adjusted by providing the adjusting section only in one flow path, so that a simple device configuration can be obtained without providing the adjusting section in all the layers.

Further, generally, when the binder content in the slurry is increased, the adhesion with the substrate is increased, but the unevenness of the binder component is likely to occur during drying and the strength of the layer of the slurry after drying is reduced. . In this embodiment, an adjusting portion for adjusting the flow rate distribution of the slurry 3 in the width direction by flowing out the slurry 3 is provided in the second flow path 22, which is a layer-side flow path in contact with the surface of the base material 2. With this, it is possible to adjust the thickness distribution of the slurry 3 in the width direction of the layer in contact with the base material 2 to be small. Therefore, an adjusting part for causing the slurry 3 to flow out is not provided in the flow path of the layer in contact with the base material 2. The thickness of the layer in contact with the surface of the base material 2 can be adjusted to be smaller than that in the case of being provided in another layer. In order to reduce the decrease in strength of the slurry after drying as described above, for example, while considering the segregation of the binder, the binder content of the layer in contact with the base material of the multi-layered slurry applied to the base material may be changed. It is conceivable that the number of layers is increased compared to the number of layers. By using the multi-layer coating apparatus 1 of the present invention to adjust the amount of the slurry to the layer in contact with the base material, which is the layer having a large amount of binder, to reduce the amount of the slurry, the whole slurry to be applied to the base material is obtained. It is possible to apply the slurry having a uniform thickness in the width direction of the entire layer of the slurry while minimizing the amount of the binder contained. By doing so, it is possible to obtain an excellent effect of increasing the adhesion between the surface of the base material and the slurry layer and reducing the decrease in strength of the entire slurry layer.

In the present embodiment, the

outflow portions

41, 42, 43, and 44, which are the adjusting portions that cause the slurry 3 to flow out of the multilayer die 10, are provided on the surface of the second divided body 14 that is combined with the first divided body 13. The adjusting section may be a second inflow section for inflowing the slurry 3 from the outside of the multilayer die 10, or the inflow of the slurry 3 from the outside of the multilayer die 10 and the outflow of the slurry 3 to the outside of the multilayer die 10. It may be an adjusting unit that can switch between.

The adjusting unit may be provided in the first slit 18 instead of the second slit 19.

Here, the case where the multilayer die 10 is installed so that the slurry 3 of the multilayer die 10 flows to the substrate 2 through the first slit 18 and the second slit 19 in the horizontal direction has been described. The installation posture of 10 may be other than this. For example, the multilayer die 10 may be installed in a posture in which the first slit 18 and the second slit 19 are arranged side by side in the vertical direction. In this case, the slurry 3 is loaded with the first slit 18 and the second slit 19. The multi-layer die 10 may be installed so that the direction of flow to the substrate 2 through and becomes the vertical direction upward.

Example 2 of the present invention adjusts the flow rate distribution in the width direction of the slurry 3 of two layers. In the multi-layer coating apparatus 101 of the second embodiment, the adjusting section of the multi-layer coating apparatus 1 of the first embodiment is also provided on the first flow path 21 side. Further, unlike the adjusting section of the multilayer coating apparatus 1 of Example 1, the adjusting section of the multilayer die 110 of the multilayer coating apparatus 101 of Example 2 of the present invention only causes the slurry 3 to flow out of the multilayer die 110. Instead, it also serves to flow in from outside the multi-layer die 110. This will be described with reference to FIGS. 5 and 6. Here, FIG. 5 shows a schematic configuration of the multilayer coating apparatus 101 of the second embodiment. Further, FIG. 6A shows a view as seen from the arrow d in FIG. In addition, the same number is given to the same structure as the multilayer coating apparatus of the first embodiment.

On the surface of the first divided body 13 that constitutes the slit 18 of the first flow path 21, the first adjusting unit 145 that allows the slurry 3 to flow out to the outside of the multilayer die 110 or to flow the slurry 3 from the outside of the multilayer die 110 in the width direction. , 146, 147, 148 are provided. As shown in FIG. 6 (A), the

first adjusting portions

145, 146, 147, 148 include a through hole that connects the first slit 18 and the outside of the multilayer die 110, and a first pipe connected to the through hole. 155, 156, 157, 158.

Further, each of the first adjusting

parts

145, 146, 147, 148 is provided with an adjusting means for adjusting the amount of the slurry 3 which flows out from the first slit 18 or flows into the first slit 18. More specifically, as shown in FIG. 6A,

first valves

165, 166, 167, 168 are connected to the first pipes 156, 157, 158, 159 as the adjusting means. Each of these

first valves

165, 166, 167, 168 has the function of adjusting the flow rate of the slurry 3 flowing out from or flowing into each of the

first adjusting portions

145, 146, 147, 148. Each of the

first valves

165, 166, 167, 168 may adjust the pressure of the slurry 3 flowing out of or flowing into each of the

first adjusting portions

145, 146, 147, 148.

Then, the first adjusting slurry supply passage 131 and the first adjusting for supplying the slurry 3 from the first supplying means 31 to the

first adjusting units

145, 146, 147, 148 are provided to the

first valves

165, 166, 167, 168. The first adjusted slurry discharge passage 135 for discharging the slurry 3 discharged from each of the

parts

145, 146, 147, 148 to the recovery tank 37 and the

first switching valves

175, 176, 177, 178 for switching are connected respectively. . By switching the

first switching valves

175, 176, 177, 178 respectively, the slurry 3 is caused to flow from the

first adjusting portions

145, 146, 147, 148 into the first flow passage 21, or the slurry 3 flowing in the first flow passage 21 is changed to the first flow passage 21. It is possible to select to flow out from the one

adjusting unit

145, 146, 147, 148, respectively.

Similarly, on the surface of the second divided body 14 forming the slit 19 of the second flow path 22, the slurry 3 is caused to flow out to the outside of the multilayer die 110 or to flow the slurry 3 from the outside of the multilayer die 110 in the width direction. Two adjusting

units

141, 142, 143, 144 are provided. As shown in FIG. 6 (A), the

second adjusting portions

141, 142, 143, and 144 include a through hole that connects the second slit 19 and the outside of the multilayer die 110, and a second pipe connected to the through hole. And 151, 152, 153 and 154.

Further, each of the second adjusting

parts

141, 142, 143, 144 is provided with an adjusting means for adjusting the amount of the slurry 3 to flow out from the second slit 19 or flow into the second slit 19. More specifically, as shown in FIG. 6A,

second valves

161, 162, 163, 164 are connected to the

second pipes

151, 152, 153, 154 as the adjusting means. Each of these

second valves

161, 162, 163, 164 has a function of adjusting the flow rate of the slurry 3 flowing out from or flowing into each of the

second adjusting portions

141, 142, 143, 144. In addition, each of the

second valves

161, 162, 163, 164 may adjust the pressure of the slurry 3 flowing out from or flowing into each of the

second adjusting portions

141, 142, 143, 144.

Then, the second adjusting slurry supply passage 132 and the second adjusting for supplying the slurry 3 from the second supplying means 32 to the

second adjusting portions

141, 142, 143, 144 are supplied to the

second valves

161, 162, 163, 164, respectively. Second switching

valves

171, 172, 173, 174 for switching the second adjusted slurry discharge flow path 136 for discharging the slurry 3 discharged from each of the

parts

141, 142, 143, 144 to the recovery tank 37 are respectively connected. . By switching the

second switching valves

171, 172, 173, 174, respectively, the slurry 3 is caused to flow into the second flow passage 22 from the

second adjusting portions

141, 142, 143, 144, or the slurry 3 flowing in the second flow passage 22. Can be selected to flow out from the

second adjusting portions

141, 142, 143, 144, respectively.

Thus, in the multi-layer die 110, the slurry 3 in the first flow path 21 flows out of the multi-layer die 110 from the first slit 18 other than the discharge port 20 or from the outer side of the multi-layer die 110 to the first slit of the first flow path 21. The

first adjusting parts

145, 146, 147, 148 for causing the slurry 3 to flow into the nozzle 18, and the slurry 3 in the second flow path 22 to the outside of the multilayer die 110 from the second slit 19 other than the discharge port 20 or the multilayer die 110. Since the

second adjusting portions

141, 142, 143, 144 for allowing the slurry 3 to flow into the second slit 19 from the outside of the first passage 21 or the second passage 22 in the width direction of the slurry 3 are provided. The flow rate distribution can be adjusted freely.

By doing this, by adjusting the thickness distributions of the two layers in the width direction of the slurry, the thickness distribution adjustment taking into account the thickness distribution adjustment of the other side can be performed, thus improving the overall thickness distribution adjustment function. In addition, since it is possible to select and adjust only one of the layers or both of the layers, it is possible to adjust depending on the slurry and coating conditions.

When adjusting the widthwise flow rate distribution of the slurry in each of the two adjacent channels, for example, the slurry 3 flowing in the first channel 21 from the

first adjusting portions

145 and 147 of the first channel 21 is mixed with the multilayer die 110. Of the slurry 3 from the outside of the multilayer die 110 to the first flow path 21 through the

first adjusting portions

146 and 148, and further, the second flow at the same position in the width direction as these. The slurry 3 flowing through the second flow path 22 from the

second adjusting portions

141 and 143 of the passage 22 is caused to flow out of the multilayer die 110, and the slurry 3 is discharged from the outside of the multilayer die 110 through the

second adjusting portions

142 and 144. As shown in FIG. 6 (B), the interface between the layer on the base material 2 side and the layer on the opposite side of the slurry 3 applied to the base material 2 is adjusted to be a flat surface by adjusting the flow into the passage 22. In the width direction of the base material 2 It may be the face of the hit shape. By doing so, the contact area at the interface between the two applied layers is increased, and the adhesive force between the layers can be increased.

The multi-layer coating apparatus 201 according to the third embodiment of the present invention has substantially the same configuration as that of the multi-layer coating apparatus 101 according to the second embodiment illustrated in FIG. The multi-layer coating apparatus 201 of the third embodiment differs from the multi-layer coating apparatus 101 of the second embodiment in that the positions of the adjusting portions provided in the respective flow paths of the two layers are displaced in the width direction. This will be described with reference to FIG. FIG. 7 (A) is a view taken in the direction of arrow d in FIG. 5 used in the description of the multilayer coating apparatus 101 of Example 2.

Second adjusting

parts

241, 242, 243, 244 are provided in the width direction on the side of the second flow path 22, and second adjusting

parts

241 and 242 of the second flow path are provided on the side of the first flow path in the width direction. Between the first adjusting part 245 located between the first adjusting part 245 and the second adjusting part 242 and the second adjusting part 242 of the second flow path, and the

second adjusting part

243 and 244 of the second flow path. A first adjusting unit 247 located between them is provided.

Here, since the first adjusting

parts

241, 242, 243, 244 and the second adjusting

parts

245, 246, 247 can adjust the flow rates of the slurry 3 at different positions in the width direction, respectively, the width of the entire layer Since the number of adjustment points in the direction is increased, the flow rate of the slurry in the width direction of the entire layer discharged from the discharge port 20 described in the second embodiment is such that the adjustment portions between the two layers face each other in the same position in the width direction. Since there are more adjustment points in the width direction than in the case of such a positional relationship, fine adjustment can be performed without increasing the number of adjustment sections in one flow path. Further, the flow rate can be adjusted with a high resolution in the width direction, which exceeds the number of adjusting units that can be arranged in one flow path in terms of size.

For example, even in the adjustment for increasing the adhesive force between the two adjacent layers described in the second embodiment, when the multilayer coating is performed using the multilayer coating apparatus 201 in the present embodiment, the number of adjusting parts is smaller than that in the second embodiment. Since the number of adjustment positions in the width direction is increased from four to seven, although the total amount of the slurry 3 discharged from the discharge port 20 is constant, the first adjustment unit 241, When the slurry 3 is adjusted so as to flow into the multi-layer die 210 from all of the adjusting

parts

242, 243, 244 and the second adjusting

parts

245, 246, 247, as shown in FIG. The corrugated shape of the interface can be made finer than in the state of FIG. 6B showing the state in which the base material 2 is multilayer-coated with the multilayer coating apparatus 101 of the second embodiment. As a result, the position of the adjusting portion in the width direction is shifted in the width direction between the two layers, thereby increasing the contact area of the interface and adjoining the two adjacent layers as compared with the case where the position of the adjusting portion in the width direction is the same between the two layers. The adhesive force between layers can be improved.

The embodiments of the present invention have been described above, but the present invention is not limited to these. For example, the multilayer coating apparatus of the present invention may be used for a multilayer coating apparatus having two or more layers. In that case, the adjustment section may be provided in the flow path of any one of the multiple layers, and the number of layers to be adjusted does not matter. For example, the adjusting unit may be provided only in the flow passages of one layer or may be provided in the flow passages of all layers.

For example, in Example 1, the multilayer die may have three or more layers, and the adjusting part may be provided in a flow path other than the flow path in which the slurry 3 of the layer in contact with the surface of the base material 2 flows.

Further, the adjusting section is not a flow path through which two adjacent layers of slurry flow as described in Example 2 or 3, but a flow path through which two layers of slurry sandwiching a layer between which no adjustment section is provided flows. It may be provided.

Further, in this embodiment, the first flow path 21 and the second flow path 22 are formed by using the first divided body 13, the second divided body 14, the first shim plate 15, the second shim plate 16, and the partition plate 17. However, the method of forming the flow path is not limited to this, and a plurality of flow paths that are long in the width direction may be formed inside the multilayer die. For example, as shown in FIG. 8, a solid die having a long width may be hollowed out in a direction orthogonal to the width direction to form a multilayer die in which a plurality of flow paths are provided using a block provided with a plurality of grooves. Here, FIG. 8 shows a cross-sectional view of the multilayer die 310 that is long in the width direction (Y-axis direction), as seen from a direction orthogonal to the width direction. The multilayer die 310 shown in FIG. 8 is provided with two flow paths through which the slurry flows. The multilayer die 310 is composed of a block 311 that is long in the width direction and side plates that close both end faces of the block 311 in the width direction that are not shown. Here, the block 311 is provided with through

holes

312, 313 and through

grooves

314, 315, 316 penetrating both widthwise end surfaces thereof. Here, one end of the through groove 314 communicates with the through hole 312, and one end of the through groove 315 communicates with the through hole 313. The ends of the through-

grooves

314 and 315 opposite to the side communicating with the through-

holes

312 and 313 communicate with one end of the through-groove 316. The end of the through-groove 316 opposite to the side communicating with the through-

grooves

314 and 315 communicates with the widthwise surface of the block 311, that is, the lower surface in the X-axis direction in FIG. The space formed by closing the through hole 312 with the side plate (not shown) is the first manifold 322, and the space formed by closing the through hole 313 with the side plate (not shown) is the second manifold 323, and the through

grooves

314, 315, 316. However, the space formed by the side plate (not shown) is the first slit 324, the second slit 325, and the confluence slit 326. The discharge port 330 is an opening formed by a portion where the through groove 316 communicates with the surface of the block 311 in the width direction and a side plate (not shown). The multi-layer die 310 is provided with

inflow ports

327 and 328 for inflowing the slurry, which communicates with the first manifold 322 and the second manifold 323 respectively from the surface long in the width direction of the block 311. With such a configuration, in the multilayer die 310, the slurry supplied from the inflow port 327 to the first manifold 322 is discharged from the discharge port 330 through the first slit 324, the merge slit 326, and the first flow path 331. And a second flow path 332 through which the slurry supplied from the inflow port 328 to the second manifold 323 passes through the second slit 325 and the merging slit 326 and is discharged from the discharge port 330. The adjusting portion 333 is provided in the second slit 325 of the second flow path 332.

Further, for example, a multi-layer die in which a plurality of slurry flow channels meet inside a multi-layer die in front of the discharge port as shown in FIG. 8 may be used.

Further, the adjusting part may be provided in a wide flow path in the width direction inside the multi-layer die, and may be provided in the manifold instead of being provided in the slit as described in the present embodiment. A manifold may be provided and the adjusting unit may be provided on the second manifold.

Also, the slurry that has flowed out of the adjustment unit may be returned to the supply tank instead of being discharged to the discharge tank. In that case, it is desirable that a filter is provided in the return path.

DESCRIPTION OF SYMBOLS 1 Multilayer coating apparatus 2 Base material 3 Slurry 5 Roller 10 Multilayer die 11 First manifold 12 Second manifold 13 First division body 13a First lip 14 Second division body 14a Second lip 15 First shim plate 16 Second shim Plate 17 Partition Plate 18 First Slit 19 Second Slit 20 Discharge Port 21 First Flow Path 22 Second Flow Path 23 First Inflow Port 24 Second Inflow Port 30 Supply Means 31 First Supply Means 32 Second Supply Means 33 First Inflow pipe 34 Second inflow pipe 35 First tank 36 Second tank 37 Recovery tank 41, 42, 43, 44 Outflow portion 51, 52, 53, 54 Outflow pipe 61, 62, 63, 64 Valve 71 Sensor 72 Control device 101 Multi-layer coating device 110 Multi-layer die 131 First adjustment slurry supply channel 135 First adjustment Slurry discharge flow path 136 Second adjustment slurry discharge flow path 161 Second valve 165 First valve 141, 142, 143, 144 Second adjustment section 145, 146, 147, 148 First adjustment section 151, 152, 153, 154th Two pipes 155, 156, 157, 158 First pipe 156, 157, 158, 159 First pipe 161, 162, 163, 164 Second valve 165, 166, 167, 168 First valve 171, 172, 173, 174 Two switching valves 175, 176, 177, 178 First switching valve 201 Multi-layer coating device 241, 242, 243, 244 Second adjusting section 245, 246, 247 First adjusting section 310 Multi-layer die 330 Discharge port 331 First flow path 332 Second flow path 333 adjustment unit

Claims

In a multi-layer coating device that simultaneously applies the slurry to the substrate in multiple layers,
A discharge port for discharging the slurry to the base material,
A plurality of flow paths that are long in the width direction and that supply the slurry to the discharge port,
A die formed so that the slurry is discharged in layers from the discharge port to the surface of the base material via the respective flow paths,
A plurality of supply means for respectively supplying the slurry to the plurality of flow paths,
At least one of the flow passages is provided with a plurality of adjusting portions for adjusting the discharge amount of the slurry from the discharge port by causing the slurry to flow out or flow in, and a plurality of adjusting units are provided in the width direction. Coating equipment.
The multi-layer coating apparatus according to claim 1, wherein the adjusting unit is provided only in one of the flow paths.
3. The adjusting unit adjusts the discharge amount of the slurry from the discharge port by causing the slurry to flow out from the flow path that supplies the slurry of the layer in contact with the surface of the base material. The multi-layer coating apparatus described in 1.
The multi-layer coating apparatus according to claim 1 or 3, wherein the adjusting unit is provided in each of the flow paths that supply two layers of slurry.
Arrangement of the adjusting portion in each of the flow paths for supplying the slurry of the two layers is characterized in that the one flow path and the other flow path are displaced in the width direction. Item 4. The multilayer coating device according to Item 4.
The multi-layer coating apparatus according to claim 4 or 5, wherein the adjusting section is provided in each of the flow paths for supplying the slurry of two adjacent layers.