JP6346820B2 - Coating equipment - Google Patents

Description

  The present invention relates to a coating apparatus that enables various coating liquids to be applied to a sheet-like substrate that is continuously conveyed.

  For example, Patent Document 1 discloses a gravure coater for applying a coating liquid containing ceramic or the like.

  The base material there is a metal sheet constituting the electrode of the secondary battery, and the gravure coater there is installed next to the gravure roll whose outer peripheral surface is in contact with the conveyed sheet, and the gravure roll. A chamber head, and a coating liquid circulation device that supplies the coating liquid with pressure to the chamber head.

  A storage part for storing the coating liquid is provided between the chamber head and the gravure roll, and the coating liquid is transferred from the storage part to the outer peripheral surface of the rotating gravure roll, so that the coating liquid is It is applied to the sheet.

  In patent document 1, the chamber head is devised so that a bubble may not mix in the coating liquid which transfers to the outer peripheral surface of a gravure roll.

  Specifically, a reservoir forming body having a weir is attached inside the reservoir, and the coating liquid that overflows over the weir is discharged from the reservoir through the discharge port. .

  By doing so, along with the overflowing coating liquid, the bubbles also get over the weir and do not return to the gravure roll side, thereby preventing bubbles from entering the coating liquid that moves to the outer peripheral surface of the gravure roll. ing.

JP 2011-245448 A

  For example, as in Patent Document 1, when the coating liquid contains hard fine particles such as ceramic, there is a problem that the inner wall surface of the chamber head in contact with the coating liquid is scraped and worn by the hard fine particles. There is.

  In particular, wear tends to occur in places where the flow of the coating liquid is fast or where the flow of the coating liquid is disturbed. Wear is likely to occur even at locations where the inner wall surface is uneven or pointed.

  On the other hand, in the gravure coater of Cited Document 1, the reservoir forming body is attached inside the reservoir so as to obstruct the flow path of the coating liquid. And the storage part formation body is also uneven and has the shape where the corner | angular part was pointed. Therefore, there exists a fault that a storage part formation body wears easily and lacks durability.

  In particular, when the reservoir forming body is formed of a metal such as an aluminum alloy (the chamber head is generally made of metal), conductive fine particles are mixed into the coating liquid.

  Therefore, in an application where an insulating film is applied to the electrode material of the secondary battery, the insulating function of the insulating film is impaired, and a short circuit may occur in the manufactured secondary battery, which may cause trouble. There is.

  The coating liquid is not only used in the case of containing such hard fine particles, but it can be applied to a coating liquid having a very high viscosity, a coating liquid that is very easy to dry, and a coating liquid having extremely poor fluidity. There are various coating liquids that are likely to be unstable and prone to trouble.

  Accordingly, an object of the present invention is to provide a coating apparatus that can stably use various coating liquids and realize high-quality coating.

  The disclosed coating apparatus applies a coating solution to a sheet-like substrate that is continuously conveyed. This coating apparatus is installed next to the coating roll that is driven to rotate and transfers the coating liquid supplied to the outer peripheral surface to the substrate, and is applied to the outer peripheral surface of the coating roll. A coating chamber for supplying a working liquid; and a coating liquid supplier for circulating and supplying the coating liquid to the coating chamber.

  The coating chamber includes a chamber main body arranged side by side with the coating roll, a doctor blade projecting from one of an upper part and a lower part of the chamber main body toward the coating roll, and an upper part and a lower part of the chamber main body And a sealing blade projecting from the other side toward the coating roll.

  The chamber body is formed so as to extend along the coating roll between the doctor blade and the seal blade, and has a horizontally long recess having a flat bottom surface facing the coating roll, and a bottom of the horizontally long recess. An inflow port that opens to the side and allows the coating liquid to flow into the horizontally long recess, and an outflow port that opens to the upper side of the horizontally long recess and allows the coating solution to flow out from the horizontally long recess.

  The coating chamber is arranged such that the tip of the doctor blade is in contact with the outer peripheral surface of the coating roll that is moving away, and the tip of the seal blade is in contact with the outer peripheral surface of the coating roll that is approaching. As a result, a liquid reservoir is formed between the coating chamber and the coating roll for storing the coating liquid and continuously supplying the coating liquid to the outer peripheral surface of the rotating coating roll. ing.

  In addition, the outflow port is formed in a horizontally long shape across both ends of the horizontally long recess, and a horizontally long liquid storage space that allows temporary storage of the coating liquid flowing out from the outflow port is provided in the flow direction. It is provided through a horizontally long drainage passage that continues to the outlet.

  That is, in this coating apparatus, the coating liquid is supplied to the outer peripheral surface of the coating roll in a flat space sandwiched between the outer peripheral surface of the coating roll that circulates from the bottom to the upper side and the flat bottom surface of the horizontally elongated recess. A liquid reservoir part is formed, and a horizontally long outlet for allowing the coating liquid to flow out is formed over the entire width of the upper part of the liquid reservoir part. The outflow port communicates with the horizontally long liquid storage space via the horizontally long drainage passage.

  Therefore, according to this coating apparatus, even when the coating liquid is wound up by the coating roll, the coating liquid can be allowed to flow out from the liquid reservoir through the outlet without applying an excessive load to the coating liquid. it can. Therefore, stable coating can be realized regardless of the properties of the coating liquid.

  Even in the vicinity of the doctor blade that feeds the coating liquid, the coating liquid is kept at a low pressure and the flow is slow and stabilized. For this reason, the bubbles in the coating liquid are not easily caught in the doctor blade, but can easily enter the liquid storage space through the outlet, and the mixing of bubbles in the coating liquid that moves to the coating roll can be effectively suppressed.

  By providing the liquid storage space separately from the liquid reservoir, the capacity of the liquid storage space can be increased compared to the liquid reservoir. Accordingly, since the coating liquid overflowing in the liquid reservoir can be stored in the liquid storage space with a margin, it is possible to prevent the coating liquid flowing into the liquid storage space from flowing back to the liquid reservoir with a margin.

  For example, the drainage passage is inclined upward from the upper end of the bottom surface of the horizontally elongated recess, and the downstream end of the drainage passage is open above the side of the liquid storage space. Good.

  Then, the backflow of the coating liquid can be further prevented, and the inside of the liquid reservoir can always be filled with the coating liquid, so that the coating liquid can be stably supplied to the coating roll.

  Further, the corner portion of the upper end portion of the bottom of the horizontally elongated recess that becomes the lower edge of the outflow port is likely to be worn, but since it has a shape that is gently bent along the flow of the coating liquid, it can be hardly worn.

  The chamber main body includes a first member in which the horizontally long recess and the drainage passage are formed, and a second member assembled to the first member to form the liquid storage space. It may be like that.

  If the coating liquid and coating conditions are changed, the liquid volume balance between the liquid reservoir and the liquid storage space may be lost, and the flow of the coating liquid may become unstable. Since the second member can be exchanged, the liquid amount balance can be adjusted. Therefore, even if the coating liquid and the coating conditions are changed, a stable flow of the coating liquid can be maintained, so that the versatility is excellent. There is also an advantage that it is easy to clean.

  In this case, the first member may be made of alumina.

  Then, durability can be improved. Even if wear occurs, it is fine particles of alumina that are mixed in the coating liquid. This is particularly effective when the coating liquid is required to have a flame-retardant or insulating function.

  Moreover, you may make it each inner wall surface of the said laterally long recessed part and the said drainage path be coat | covered with the protective layer.

  Then, even if the main body of the chamber body is made of an easily processed aluminum alloy or the like, durability and coating quality can be improved.

  The lower surface of the liquid storage space is inclined, and a drain hole for discharging the coating liquid from the liquid storage space may be opened at the lowermost portion of the lower surface.

  Then, the coating liquid can be smoothly discharged from the liquid storage space without stagnation, so that the coating liquid does not easily accumulate in the liquid storage space, and the backflow of the coating liquid to the liquid storage portion is effective. Can be prevented.

  It is preferably used in the process of manufacturing a lithium secondary battery. If it does so, generation | occurrence | production of inferior goods can be suppressed effectively.

  According to the coating apparatus of the present invention, various coating liquids can be used, and high-quality coating can be realized.

It is a schematic perspective view which shows the coating apparatus of this embodiment. It is a schematic sectional drawing which shows an example of a base material. It is a disassembled perspective view which shows the structure of a coating chamber in the cross section shown by the arrow line XX of FIG. It is a schematic sectional drawing in the arrow line YY of FIG. It is a schematic front view of the chamber main body for demonstrating the flow of the coating liquid in a coating chamber.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the following description is merely illustrative in nature and does not limit the present invention, its application, or its use.

<Coating device>
In FIG. 1, the coating apparatus 1 of this embodiment is shown. The coating apparatus 1 is an apparatus that applies a coating liquid to a sheet-like substrate W that is continuously conveyed, and includes an upper guide roll 2, a lower guide roll 3, a coating liquid supplier 10, and a coating. It comprises a roll 20, a coating chamber 30, and the like.

  The upper guide roll 2 and the lower guide roll 3 are arranged in parallel to each other apart in the vertical direction in the middle of the transport path of the substrate W. The upper guide roll 2 and the lower guide roll 3 are both supported by a device frame (not shown) in a state of being rotatable around horizontal axes J1 and J2 extending in a substantially horizontal direction.

  The back surface of the substrate W at the time of coating is supported by the upper guide roll 2 and the lower guide roll 3 in a stretched state. The substrate W is transported upward in the up-down direction (substantially vertical direction) at a controlled speed, as indicated by the white arrow.

(Base material)
In FIG. 2, an example of the base material W (it shows with a continuous line) coated with this coating apparatus 1 is shown. The illustrated base material W is a base material that is an electrode material of a lithium secondary battery, and is a sheet material 80 (copper foil or the like) made of a strip-shaped metal thin film, and an active material layer 81 ( Graphite).

  In the coating apparatus 1, the coating liquid is applied to the surface of the substrate W, and a flame-retardant insulating layer 82 (shown by imaginary lines) is formed on the active material layer 81. The insulation layer 82 is formed also about the back surface of the base material W by applying by a double-sided coating continuously in a post process, or by turning over the base material W and applying. Thereby, an electrode material in which the active material layers 81 on both surfaces of the substrate W are covered with the insulating layer 82 is obtained.

  The coating liquid contains a large amount of fine particles of alumina (aluminum oxide) as a flame retardant. Alumina has properties such as non-conductivity, high hardness, and high melting point, and its fine particles are often used for abrasives and the like. Therefore, there is a problem that wear is likely to occur at a location where the coating liquid collides violently on the inner wall surface of the flow path of the coating liquid.

  On the other hand, in this coating apparatus 1, as described later, such wear can be effectively suppressed. The coating liquid is circulated and supplied to the coating chamber 30 by the coating liquid supplier 10.

(Coating fluid supplier)
The coating liquid supplier 10 includes a storage tank 11, a liquid feed pump 12, a liquid feed pipe 13, a liquid return pipe 14, and the like. The storage tank 11 is a container for storing a coating liquid, and is installed at a lower position than the coating chamber 30. The storage tank 11 is connected to the coating chamber 30 via the liquid feeding pipe 13. A liquid feed pump 12 is installed in the middle of the liquid feed pipe 13, and the coating liquid is supplied from the storage tank 11 to the coating chamber 30 by the discharge force of the liquid feed pump 12.

  The storage tank 11 is also connected to the coating chamber 30 via the liquid return pipe 14. The return pipe 14 is routed so as to descend from the coating chamber 30 toward the storage tank 11. Accordingly, the coating liquid that has become excessive (overflowed) in the coating chamber 30 is returned to the storage tank 11 through the liquid return pipe 14 by free fall. At the time of coating, the liquid feeding pump 12 is driven to circulate and supply the coating liquid from the storage tank 11 to the coating chamber 30.

(Coating roll)
The coating roll 20 has a horizontally long cylindrical shape and is formed of ceramic having excellent wear resistance. The coating roll 20 is located at a height between the upper guide roll 2 and the lower guide roll 3, and is disposed in parallel with the surface in contact with the surface of the substrate W.

  Similarly to the upper guide roll 2 and the lower guide roll 3, the coating roll 20 is also supported by a device frame (not shown) so as to be rotatable around the horizontal axis J <b> 3. A motor 21 is attached to the coating roll 20. The coating roll 20 is rotationally driven by the motor 21 so that the outer peripheral surface circulates in a direction opposite to the conveyance direction of the substrate W at the contact portion with the substrate W.

  On the outer peripheral surface of the coating roll 20, a coating region (not shown) composed of a large number of cells (dents) is formed. The surface of the substrate W is in contact with this coating region. A certain amount of coating solution is continuously supplied from the coating chamber 30 to this coating region that circulates as the coating roll 20 rotates. When the coating liquid moves to the surface of the substrate W to be transported, the surface of the substrate W is continuously applied.

(Coating chamber)
The coating chamber 30 is a horizontally long structure composed of a plurality of members, and is installed beside the coating roll 20.

  3 and 4 show details of the coating chamber 30. FIG. The coating chamber 30 includes a chamber body 31, a doctor blade 32, a seal blade 33, a side seal 34, a pressing tool 35, and the like. The chamber body 31 is a horizontally long member arranged next to the coating roll 20, and includes a first member 40, a second member 50, and the like.

  The first member 40 is a horizontally long member that forms the main body of the chamber body 31, and has the same length as the coating roll 20. The first member 40 of the present embodiment is an integral body made of alumina. Therefore, the first member 40 is non-conductive and has excellent wear resistance.

  In this coating apparatus 1, since the first member 40 is made of alumina, durability is improved in terms of material. Even if wear occurs, fine particles of alumina are mixed in the coating liquid. Accordingly, the flame retardancy and insulating functions of the coating layer are not impaired, and stable quality improvement is also achieved.

  The first member 40 has a simple structure that can be cut out from a horizontally long plate-like alumina material so that it can be processed relatively easily even with high-hardness alumina.

  Specifically, on one side surface (side surface facing the coating roll 20) of the first member 40, a horizontally long recess having a generally rectangular shape with a shallow bottom and extending linearly in the longitudinal direction and penetrating both ends. (Horizontal recess 41) is formed. A bottom surface 41 a of the horizontally elongated recess 41 is a flat surface substantially parallel to the other side surface (back side surface 40 a) of the first member 40.

  On the upper side of the horizontally elongated recess 41, an upper support portion 42 having a flat blade support surface 42a formed on the side is provided along the upper edge of the horizontally elongated recess 41. A lower support portion 43 having a flat blade support surface 43 a formed on the side is also provided along the lower edge of the horizontally elongated recess 41 on the lower side of the horizontally elongated recess 41. The upper and lower blade support surfaces 42a and 43a are inclined surfaces that slightly incline downward as they move away from the other support surface.

  The doctor blade 32 and the seal blade 33 are attached to the upper support portion 42 and the lower support portion 43. The doctor blade 32 and the seal blade 33 are both made of resin and have a horizontally long strip shape that is about the same length as the coating roll 20.

  The doctor blade 32 is disposed on the blade support surface 42 a of the upper support portion 42 so that the distal end side protrudes above the horizontally elongated recess 41. Then, in a state where the doctor blade 32 is pressed against the blade support surface 42a with the pressing tool 35, these plural places are fastened with bolts. By doing so, the doctor blade 32 is attached to the upper support portion 42. The seal blade 33 is also attached to the lower support portion 43 in the same manner as the doctor blade 32.

  As shown in FIGS. 4 and 5, one inflow port 45 is formed below the central portion in the longitudinal direction of the horizontally elongated recess 41. The inflow port 45 opens in a semicircular shape at the corner of the boundary between the lower end portion of the bottom surface 41a of the horizontally long concave portion 41 and the lower support portion 43, and communicates with a cylindrical liquid supply passage 46 extending from the back side surface 40a. Yes.

  A horizontally long outlet 47 is formed above the horizontally long recess 41.

  The outlet 47 extends along the corner of the boundary between the upper end portion of the bottom surface 41 a of the horizontally long recess 41 and the upper support portion 42, and opens in a slit shape in a range extending from one end to the other end of the horizontally elongated recess 41. . The first member 40 is formed with a horizontally long drainage passage 48 that is continuous with the outflow port 47 and opens in the back side surface 40 a and has the same cross-sectional area as the outflow port 47.

  The drainage passage 48 is inclined upward from the upper end portion of the bottom surface 41 a of the horizontally elongated recess 41, and the downstream end portion (downstream side opening 48 a) of the drainage passage 48 that opens to the back side surface 40 a is an outlet 47. In a higher position. Reinforcing ribs 49 are provided at a plurality of locations in the longitudinal direction of the outlet 47 and the drainage passage 48 to ensure strength.

  The second member 50 is a horizontally long member having the same length as the coating roll 20. In the case of the present embodiment, the second member 50 is made of the same alumina as the first member 40 and is designed to be easily processed.

  That is, the second member 50 is formed by cutting out from a prismatic alumina material, and has a horizontally long upper wall portion 50a and a lower wall portion 50b that are opposed to each other and one edge in the longitudinal direction thereof. It consists of a side wall portion 50c that is continuous and a pair of end wall portions 50d and 50d that close the respective end portions.

  One of the side surfaces in the longitudinal direction of the second member 50 is opened horizontally (a horizontally long opening 51). The horizontally long opening 51 is designed to be larger than the downstream opening 48a.

  The second member 50 is fastened and attached to the upper part of the back side surface 40a of the first member 40 so that the horizontally long opening 51 covers the downstream side opening 48a. By doing so, a horizontally long space (liquid storage space 52) is formed inside the second member 50.

  The downstream opening 48 a is opened above the side portion of the liquid storage space 52. Accordingly, the bottom surface 52a of the liquid storage space 52 (the upper surface of the lower wall portion 50b) is positioned lower than the lower edge of the downstream opening 48a.

  In the upper wall portion 50a, a small vent hole 53 that penetrates the wall surface is formed so that the inside of the liquid storage space 52 is maintained at atmospheric pressure. A cylindrical drainage hole 54 penetrating the wall surface is formed in the lower wall portion 50b. The upper surface of the lower wall portion 50b is an inclined surface in which the substantially central portion in the longitudinal direction is slightly lowered, and the upper end of the drainage hole 54 is opened at the lowest portion of the inclined upper surface.

  A liquid supply pipe bracket 37 and a liquid discharge pipe bracket 38 are provided at each of the peripheral portions of the side end of the liquid supply passage 46 opened on the back side surface 40a and the lower end of the liquid discharge hole 54 opened on the lower surface of the lower wall portion 50b. It is attached. The liquid supply pipe 37 is connected to the liquid supply pipe bracket 37, and the liquid return pipe 14 is connected to the drain pipe bracket 38.

  The side seal 34 is made of a resin plate member. There are two side seals 34, which are fastened and attached to the respective end faces of the first member 40 in the longitudinal direction. These side seals 34 close both ends of the horizontally elongated recess 41. Each side seal 34 has an arc-shaped seal surface 34 a and a pair of blade receiving surfaces 34 b and 34 b extending upward and downward from the upper and lower sides on the side facing the coating roll 20.

  By appropriately arranging the coating chamber 30 beside the coating roll 20, the sealing surface 34a is the outer peripheral surface of the coating roll 20, and each blade receiving surface 34b is a doctor blade 32 and a sealing blade. It is formed so as to contact each of 33 without any gap.

  FIG. 4 shows a state when the coating chamber 30 is appropriately arranged and coating is performed.

  In a state where the coating chamber 30 is properly disposed, the distal ends of the doctor blade 32 and the seal blade 33 are in contact with the outer peripheral surface of the coating roll 20 without a gap. A part of the outer peripheral surface of the coating roll 20 faces the horizontally elongated recess 41 from a portion (a wetted portion) between the tip of the doctor blade 32 and the tip of the seal blade 33. The bottom surface 41a of the horizontally elongated recess 41 faces a part of the outer peripheral surface of the coating roll 20 with a gap therebetween.

  Thereby, a space (liquid reservoir 60) mainly composed of the horizontally elongated recess 41 is formed between the coating chamber 30 and the coating roll 20. The liquid reservoir 60 has a simple structure with a small capacity that spreads thinly in the vertical direction and extends horizontally, and the coating liquid is stored in the liquid reservoir 60 during coating.

  That is, at the time of coating, the coating liquid flows from the liquid feeding pipe 13 into the liquid reservoir 60 through the inlet 45. The coating liquid flowing into the liquid reservoir 60 immediately reaches the upper part of the drainage passage 48.

  The liquid level of the coating liquid stored in the liquid reservoir 60 is defined by the lower edge of the downstream opening 48a. When the coating liquid stored in the liquid reservoir 60 increases, the excess coating liquid passes over the lower edge of the downstream opening 48a and flows into the liquid storage space 52.

  Therefore, the inside of the liquid reservoir 60 at the time of coating is always filled with the coating liquid. Thereby, since the outer peripheral surface of the coating roll 20 located in the liquid contact part is always in contact with the coating liquid, the coating liquid is continuously and stably applied to the coating region of the outer peripheral surface of the rotating coating roll 20. Can be supplied.

  The tip of the seal blade 33 located on the lower side contacts the outer peripheral surface of the coating roll 20 approaching the liquid reservoir 60, and the tip of the doctor blade 32 located on the upper side separates from the liquid reservoir 60. It is in contact with the outer peripheral surface of the work roll 20.

  In the wetted part, the outer peripheral surface of the coating roll 20 is circulated at a high speed upward. Therefore, in the liquid reservoir 60, as shown by the arrow lines in FIG. 4 and FIG. 5, the flow of the coating liquid that diffuses from the longitudinal center of the lower portion of the liquid reservoir 60 to both sides and moves upward is formed. Is done.

  Since the coating liquid is wound up by the coating roll 20 at the lower part of the liquid reservoir 60, the liquid pressure is low and abrasion is unlikely to occur. Moreover, since the intermediate part of the liquid reservoir 60 has a flat shape extending in the vertical direction, the coating liquid flows smoothly and wear is less likely to occur.

  On the other hand, the upper part of the liquid reservoir 60 (a region surrounded by a two-dot chain line in FIGS. 4 and 5) that has a dead end increases the flow rate of the coating liquid, so that the liquid pressure tends to increase and the flow is disturbed. easy.

  Therefore, if the coating liquid contains a large amount of fine particles of alumina, the frictional resistance of the coating liquid increases in this region, and the inner wall surface of the chamber body 31 is likely to be worn.

  Therefore, in this coating apparatus 1, a sufficiently large outlet 47 is formed in the upper part of the liquid reservoir 60 to fill the horizontal width of the liquid reservoir 60. By doing so, even if the coating liquid is wound up by the coating roll 20, the coating liquid can be discharged from the liquid reservoir 60 through the outlet 47 without applying an excessive load to the coating liquid. Therefore, wear hardly occurs even in the upper portion of the liquid reservoir 60, and durability can be improved.

  The lower edge of the outlet 47, in other words, the corner C at the boundary between the bottom 41a of the horizontally elongated recess 41 and the lower edge of the drainage passage 48 is also less likely to wear. That is, since the drainage passage 48 is inclined upward from the upper end portion of the bottom surface 41a, the corner portion C is gently bent along the flow of the coating liquid (obtuse angle). Therefore, since frictional resistance is suppressed, it is difficult to wear.

  By providing the liquid storage space 52 so as to protrude outward from the liquid reservoir 60, the capacity of the liquid storage space 52 can be increased compared to the liquid reservoir 60.

  Therefore, the coating liquid overflowing from the liquid reservoir 60 can be stored in the liquid storage space 52 with a margin. Even if the drain hole 54 is somewhat small, the coating liquid can be discharged without overflowing from the liquid storage space 52, so that the coating liquid flowing into the liquid storage space 52 can be prevented from flowing back to the liquid reservoir 60 with a margin. it can. Further, even with the small vent 53, there is an advantage that the liquid storage space 52 can be stably maintained at atmospheric pressure.

  Since the drainage hole 54 is opened at the lowermost part of the bottom surface of the liquid storage space 52, the coating liquid can be discharged from the liquid storage space 52 without the alumina particles collecting in the liquid storage space 52.

  In the coating apparatus 1, not only wear but also bubbles can be effectively suppressed from being mixed into the coating liquid transferred to the coating roll 20.

  That is, in this coating apparatus 1, the liquid pressure of the coating liquid is also at the upper part of the liquid reservoir 60, in other words, in the vicinity of the doctor blade 32 that sends the coating liquid to the outer peripheral surface of the coating roll 20. It is kept low, and the flow of coating liquid is also gentle and stable.

  Therefore, bubbles present in the coating liquid stored in the liquid reservoir 60 are more likely to rise than being caught in the doctor blade 32 and enter the liquid storage space 52 from the liquid reservoir 60 through the outlet 47. As a result, air bubbles can be effectively suppressed from being mixed into the coating liquid transferred to the coating roll 20.

  When the coating liquid and coating conditions are changed and the physical properties and flow rate of the coating liquid are changed, the liquid volume balance between the liquid reservoir 60 and the liquid storage space 52 is lost, and the coating liquid is applied. Liquid flow may become unstable.

  However, in this coating apparatus 1, since the liquid storage space 52 is formed by attaching the second member 50 to the first member 40, the liquid reservoir portion can be obtained by replacing the second member 50 depending on the situation. The balance of the amount of liquid between 60 and the liquid storage space 52 can be adjusted. Therefore, even if the coating liquid and the coating conditions are changed, a stable flow of the coating liquid can be maintained, so that the versatility is excellent.

  Since the chamber main body 31 can be disassembled, it is advantageous in that it is easy to clean.

(Modification)
Although the chamber main body 31 of the embodiment described above is alumina, the chamber main body 31 can be formed of other than alumina.

  For example, the chamber body 31 is formed using a conventional metal that is easy to process, such as an aluminum alloy, and the surface of the flow path where the coating liquid can come into contact, that is, the inner wall surfaces of the horizontally long recess 41 and the drainage passage 48, etc. What is necessary is just to coat | cover with the nonelectroconductive protective film excellent in abrasion resistance. Even in this case, the durability and coating quality can be improved by the combination with the structure of the coating chamber 30 that can suppress wear and the like.

  Examples of the protective film include a ceramic film and a diamond-like carbon (DLC) film.

  In addition, the coating apparatus concerning this invention is not limited to embodiment mentioned above, The other various structure is included.

  For example, the material of the second member 50 may not be alumina but may be a synthetic resin. The shape, arrangement, number, and the like of the inlet 45 provided in the lower part of the liquid reservoir 60 can be changed according to specifications.

  The coating roll 20 may be formed of metal, synthetic resin, or the like, and the surface thereof may be covered with a protective film. The material of the doctor blade 32 and the seal blade 33 is not limited to a synthetic resin, and may be a metal or ceramic.

  In the embodiment described above, the vent hole 53 is formed in the upper wall portion 50a in order to maintain the inside of the liquid storage space 52 at atmospheric pressure, but the present invention is not limited thereto. For example, the same effect can be obtained unless the liquid return pipe 14 is filled with the coating liquid. Specifically, the inner diameter of the liquid return pipe 14 may be made larger than the inner diameter of the liquid feed pipe 13. If it does so, it can prevent that the liquid return piping 14 is filled with a coating liquid, and can maintain the inside of the liquid storage space 52 at atmospheric pressure.

  The fine particles contained in the coating liquid are not limited to alumina. Further, it is not essential that the coating liquid contains hard fine particles. The coating apparatus of the present invention can be used not only for general coating liquids but also for special coating liquids such as high-viscosity coating liquids, quick-drying coating liquids, and low-fluidity coating liquids. Is preferred. The coating apparatus may be disposed upside down when the base material being transported downward is coated.

DESCRIPTION OF SYMBOLS 1 Coating apparatus 10 Coating liquid supplier 20 Coating roll 30 Coating chamber 31 Chamber main body 32 Doctor blade 33 Seal blade 40 1st member 41 Horizontally long recessed part 45 Inlet 47 Outlet 48 Drainage path 50 Second member 52 Liquid accommodation Space 60 Liquid reservoir W Base material

Claims (6)

A coating apparatus for coating a coating liquid on a sheet-like substrate that is continuously conveyed,
A coating roll that is rotationally driven and transfers the coating liquid supplied to the outer peripheral surface to the substrate;
A coating chamber installed beside the coating roll and supplying a coating liquid to the outer peripheral surface of the coating roll;
A coating liquid supplier that circulates and supplies the coating liquid to the coating chamber;
With
The coating chamber is
A chamber body arranged side by side with the coating roll;
A doctor blade that projects from one of the upper and lower portions of the chamber body toward the coating roll;
A seal blade projecting from the other of the upper and lower parts of the chamber body toward the coating roll;
Have
The chamber body is
A horizontally elongated recess formed to extend along the coating roll between the doctor blade and the seal blade, and having a flat bottom surface facing the coating roll;
An inflow opening that opens to the lower side of the horizontally elongated recess and allows the coating liquid to flow into the horizontally elongated recess;
An outlet opening on the upper side of the horizontally elongated recess to allow the coating liquid to flow out from the horizontally elongated recess;
Have
The coating chamber is arranged such that the tip of the doctor blade is in contact with the outer peripheral surface of the coating roll that is moving away, and the tip of the seal blade is in contact with the outer peripheral surface of the coating roll that is approaching. Thus, the liquid reservoir is stored between the coating chamber and the coating roll in a state where the coating liquid is filled, and continuously supplies the coating liquid to the outer peripheral surface of the rotating coating roll. Part is formed,
The outflow port, wherein they are formed in a horizontally long shape extending me cotton across the oblong recess, Horizontal liquid receiving space to enable temporary accommodation of coating liquid flowing out from the outlet port, inclined upward from the upper end portion of the bottom surface of the oblong recess I Tsurana to the outlet, via a Horizontal drainage passageways its downstream end is open to the upper side of the liquid storage space And a coating device provided so as to project outward from the liquid reservoir . In the coating device according to claim 1,
The chamber body is
A first member in which the horizontally elongated recess and the drainage passage are formed;
A second member that is assembled to the first member to form the liquid storage space;
A coating device having In the coating device according to claim 2,
A coating apparatus in which the first member is formed of alumina. In the coating device according to claim 1 or 2,
The coating apparatus by which each inner wall surface of the said horizontally long recessed part and the said drainage channel is coat | covered with the protective layer. In the coating apparatus as described in any one of Claims 1-4,
The lower surface of the liquid storage space is inclined,
The coating apparatus which the drainage hole which discharges | emits a coating liquid from the said liquid storage space is opening in the lowest part of the lower surface of the said liquid storage space. In the coating apparatus as described in any one of Claims 1-4,
A coating device used in the manufacturing process of a lithium secondary battery.

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