Coating device

Abstract

To prevent expansion of a space in a discharge port by a coating pressure of a coating slip when the coating slip is coated on a web in a coating device having a die disposed below a back-up roll.SOLUTION: A die comprises a first main part and a second main part 18, and an upper surface of a first coating blade edge 36 has the same height as an upper surface of a second coating blade edge 38. A plurality of storage parts 70 are formed at the first main part 16 along a lateral direction. A differential screw 74 in the storage part 70 has: a tube screw 76 having a first male screw part 80 to be threadedly engaged with a first female screw part 72 formed on an outer periphery; and a fixed screw 78 housed in the tube screw 76 and having a second male screw part 84 to be threadedly engaged with a second female screw part 82 formed at an inner periphery of the tube screw 76 formed on an outer periphery. A rear end of the fixed screw 78 is fixed to a rear portion 16b of the first main part 16. A pitch interval of the first male screw part 80 of the outer periphery of the tube screw 76 is larger than a pitch interval of the second female screw part 82 of the inner periphery of the tube screw 76.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a coating device for applying a coating liquid to a web. [Background technology]

[0002] A conventional coating device has been proposed in which a die is installed below a backup roll that transports a web in the front-to-rear direction, and a coating solution is discharged from the upper end of the die to coat the web. This die discharges the coating solution from a slit-shaped discharge opening formed between a first coating blade edge and a second coating blade edge provided at the upper end of the die. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6835696 [Patent Document 2] Patent No. 6697645 [Patent Document 3] Patent No. 5115894 Summary of the Invention [Problem to be solved by the invention]

[0004] In the die described above, the slit-shaped discharge opening provided between the first and second coating blade edges may have a greater distance in the front-to-rear direction toward the center due to the coating pressure of the coating liquid when the coating liquid is applied to the web. Meanwhile, the first coating blade edge needs to be made thinner to increase the coating pressure when applying the coating liquid to the web. However, making the first coating blade edge thinner presents a problem in that the distance between the discharge openings in the front-to-rear direction is more likely to increase due to the coating pressure.

[0005] In view of the above problems, the present invention aims to provide a coating device that can make the first coating blade tip as thin as possible when coating a coating liquid onto a web, and can prevent the spacing between the discharge ports from widening due to the coating pressure of the coating liquid. [Means for solving the problem]

[0006] The present invention relates to a coating device having a backup roll on the lower peripheral surface of which a web runs in the front-rear direction, and a die disposed below the backup roll. The die comprises a first body having an upper surface that slopes downward toward the front to form a first inclined surface and an upper vertical cross section that is triangular; a second body that is combined with the rear surface of the first body and has an upper surface that slopes downward toward the rear to form a second inclined surface and an upper vertical cross section that is triangular; a shim sandwiched between the rear surface of the first body and the front surface of the second body; and a shim disposed on the rear surface of the first body or the front surface of the second body. a coating liquid reservoir for the coating liquid, a liquid passage for the coating liquid extending from the reservoir to the first body and the second body and surrounded by the shim in the vertical direction; a first coating blade tip protruding in the left-right direction from the rear upper end of the first inclined surface of the first body; a second coating blade tip protruding in the left-right direction from the front upper end of the second inclined surface of the second body; a slit-shaped coating liquid outlet at the upper end of the liquid passage and extending in the left-right direction between the first coating blade tip and the second coating blade tip; and a coating liquid outlet formed downward from the first inclined surface and extending across the entire width of the first body. a cylindrical storage section that is perpendicular to the cutout and has a front end that opens to the front surface of the front part of the first body and a rear end that opens to the rear surface of the front part of the first body; a first female screw section provided on the inner periphery of the storage section; and a differential screw stored in the storage section, wherein an upper surface of the first coating cutting edge is flat, an upper surface of the second coating cutting edge is flat, the upper surface of the first coating cutting edge and the upper surface of the second coating cutting edge are at the same height, and a dimension in the front-to-rear direction of the upper surface of the first coating cutting edge is larger than that of the second coating cutting edge. a coating device having a length shorter than the front-to-rear dimension of the top surface, a plurality of the storage portions formed in the first body along the left-to-right direction, the differential screw having a cylindrical cylindrical screw having a first male thread portion formed on its outer periphery that screws into the first female thread portion, and a fixing screw housed in the cylindrical screw and having a second male thread portion formed on its outer periphery that screws into a second female thread portion formed on the inner periphery of the cylindrical screw, the rear end of the fixing screw being fixed to a rear part of the first body, and the pitch spacing of the first male thread portion on the outer periphery of the cylindrical screw being greater than the pitch spacing of the second female thread portion on the inner periphery of the cylindrical screw. [Effects of the Invention]

[0007] According to the present invention, the dimension of the first coating blade tip in the front-to-rear direction is shorter than the dimension of the second coating blade tip in the front-to-rear direction, allowing for a stronger coating pressure for the coating fluid. Even if the first coating blade tip bends due to the coating pressure and the distance between the discharge ports in the front-to-rear direction increases, the cylindrical thread of the differential bolt rotates, causing the fixing screw to move rearward by the difference in pitch between the first female thread portion and the second female thread portion, and the rear part of the first body to move rearward by the same amount, preventing the first coating blade tip from moving forward and preventing the distance between the discharge ports in the front-to-rear direction from increasing. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a right side view of a coating device showing one embodiment of the present invention, in which only the die portion is shown in vertical cross section. [Figure 2] This is a vertical cross section seen from the right side of the die. [Figure 3] FIG. [Figure 4] FIG. 10 is a right side view showing an enlarged longitudinal section of the notch and the differential bolt. [Figure 5] FIG. 2 is an enlarged vertical cross-sectional view of the first coating blade tip and the second coating blade tip as viewed from the right side. DETAILED DESCRIPTION OF THE INVENTION

[0009] A coating device 10 for a web W according to one embodiment of the present invention will be described below with reference to Figures 1 to 5. The web W is long and may be a film, a metal plate, a mesh-like metal, paper, or a fabric.

[0010] (1) Overall structure of the coating device 10 The overall structure of the coating device 10 will be described. As shown in Figures 1 and 3, the coating device 10 has a backup roll 12, a die 14, and a bending device 8. The width direction of the web W and the left-right direction of the coating device 10 are parallel to each other.

[0011] The backup roll 12 has a rotation shaft 13 that is disposed horizontally and extends in the left-right direction. The backup roll 12 rotates counterclockwise around the center O of the horizontal rotation shaft 13, and the web W is held on the lower peripheral surface of the backup roll 12 and travels in the front-to-rear direction (from back to front or from left to right in FIG. 1, i.e., from upstream to downstream).

[0012] The die 14 is disposed horizontally in the left-right direction below the backup roll 12, and applies a coating liquid to the web W which is held by the lower peripheral surface of the backup roll 12 and running.

[0013] The bending device 8 corrects bending of the die 14 in the left-right direction, is provided below the die 14, and also plays a role in supporting the die 14 in the left-right direction and horizontally.

[0014] (2) Structure of die 14 The structure of the die 14 will be described with reference to Figures 1 to 5. The die 14 has a first body 16, a second body 18, a base 20, and an attachment space 44.

[0015] As shown in FIGS. 1 and 2, the base 20 is a rectangular parallelepiped that extends in the left-right direction and is disposed horizontally, and the first main body 16 is integrally provided upright from the front upper surface.

[0016] As shown in Figures 1 and 2, the first body 16 is a rectangular parallelepiped extending in the left-right direction. It has a first inclined surface 22 that slopes downward from the upper rear end to the upper front end, and its upper longitudinal cross section is triangular. The front of the first body 16 is a vertical surface. The rear of the first body 16 is also a vertical surface, and a liquid reservoir 24 is formed in the left-right direction. A first coating blade tip 36, which is a rectangular parallelepiped with a flat upper surface and extends in the left-right direction, is formed at the upper rear end of the first inclined surface 22 of the first body 16 so as to protrude upward. When a perpendicular line S is drawn from the center O of the rotation shaft 13 of the backup roll 12, the perpendicular line S passes through the front of the first coating blade tip 36 of the first body 16 of the die 14.

[0017] As shown in Figures 1 and 2, the second body 18 is disposed on the rear surface of the first body 16 and above the base 20. It is a rectangular parallelepiped extending in the left-right direction and has a smaller vertical dimension than the first body 16. The front surface of the second body 18 is a vertical surface. A second inclined surface 26 is formed so as to slope downward from the upper end of the front surface of the second body 18 toward the upper end of the rear surface, and the upper vertical cross section is triangular. A second coating blade tip 38, which is a rectangular parallelepiped extending in the left-right direction and has a flat upper surface, is formed at the upper front end of the second inclined surface 26 of the second body 18 so as to protrude toward the front.

[0018] As shown in FIG. 2, the first inclined surface 22 and the second inclined surface 26 of the die 14 are formed into a triangular cross section when viewed from the right side, with the upper ends defining the first coating cutting edge 36 and the second coating cutting edge 38. The first coating cutting edge 36 and the second coating cutting edge 38 resemble lips protruding upward, forming a so-called lip shape. Coating can be performed at the upper end of this lip shape. The dimension α of the top surface of the first coating cutting edge 36 in the front-to-rear direction is smaller than the dimension β of the top surface of the second coating cutting edge 38 in the front-to-rear direction, and the heights of the top surfaces of the first coating cutting edge 36 and the second coating cutting edge 38 are formed to be the same height.

[0019] 1 and 2, an attachment space 44 is formed between the second body 18 and the base 20. This attachment space 44 is a space whose upper surface is formed by the lower surface of the second body 18, whose lower surface is formed by the upper surface of the base 20, whose rear surface is open, whose front surface is formed by the rear surface of the first body 16, and whose left and right sides are open.

[0020] 1 and 2, a plate-like shim 28 is sandwiched between the rear surface of the first main body 16 and the front surface of the second main body 18. As shown in FIG. 3, the shim 28 is a U-shaped metal plate, and is composed of left and right peripheral portions 30, 32 disposed on the left and right sides of the liquid reservoir 24, and a lower peripheral portion 34 disposed below the liquid reservoir 24.

[0021] The first body 16, the second body 18, and the shim 28 are fixed together by fastening bolts (not shown). When fixed together, the first inclined surface 22 and the second inclined surface 26 come together, forming an upper cross-sectional shape that is approximately an isosceles triangle, as shown in Figures 1 and 2. The upper surfaces of the first coating cutting edge 36 and the second coating cutting edge 38 are at the same height, and the lower peripheral surface of the backup roll 12 is located above them with a coating gap.

[0022] 1 and 2, a liquid passage 40 is formed vertically above the liquid reservoir 24 in the space between the first body 16, the second body 18, and the shim 28, and a slit-shaped discharge outlet 42 extending in the left-right direction is formed at the upper end of the liquid passage 40. In other words, the slit-shaped discharge outlet 42 is located between the upper ends of the first coating blade tip 36 and the second coating blade tip 38. Both sides of the liquid passage 40 are closed by the left and right peripheral portions 30, 32 of the shim 28, and the lower portion is closed by the lower peripheral portion 34.

[0023] As shown in Figures 2 and 3, a coating liquid supply port 46 penetrates the center of the front surface of the liquid reservoir 24 provided in the first main body 16 in the left-right direction, and a hose 48 from a pump (not shown) that supplies the coating liquid is connected to this supply port 46.

[0024] 2, the first inclined surface 22 corresponding to the upper surface of the first body 16 is composed of a first steeply inclined surface 60 extending forward from the front base of the first coating blade tip 36, and a first gently inclined surface 62 that slopes downward as it extends forward from the front end of the first steeply inclined surface 60. The inclination angle formed by the first steeply inclined surface 60 and the horizontal plane is larger than the inclination angle formed by the first gently inclined surface 62 and the horizontal plane, and the first steeply inclined surface 60 is formed so as to protrude upward from the first gently inclined surface 62.

[0025] 2, the second inclined surface 26 corresponding to the upper surface of the second body 18 is composed of a second steeply inclined surface 64 extending rearward from the base of the rear surface of the second coating blade 38, and a second gently inclined surface 66 that slopes downward as it extends rearward from the rear end of the second steeply inclined surface 64. The angle of inclination between the second steeply inclined surface 64 and the horizontal plane is larger than the angle of inclination between the second gently inclined surface 66 and the horizontal plane, and the second steeply inclined surface 64 is formed so as to protrude upward from the second gently inclined surface 66.

[0026] As shown in FIG. 2 , a notch 68 is provided in the first gently inclined surface 62 of the first inclined surface 22 of the first main body 16. This notch 68 is provided across the entire width of the first main body 16 in the left-right direction. The top of the notch 68 is open and the bottom is closed. The notch 68 is inclined relative to the vertical direction, and slopes more rearward as it extends downward. The downward inclination angle of the notch 68 is formed perpendicular to the first gently inclined surface 62. The closed lower portion of the notch 68 is located slightly above the top of the liquid reservoir 24. The notch 68 divides the upper portion of the first main body 16 into a front portion 16a and a rear portion 16b. The first coating blade tip 36 and the first steeply inclined surface 60 are included in the front portion 16a, as well as a portion of the first gently inclined surface 62. The entire upper surface of the front portion 16a is formed by the first gently inclined surface 62.

[0027] 2 and 4, storage sections 70, which are circular cross-sectional spaces, are provided at equal intervals in the front-rear direction in the front portion 16a of the first main body 16. The front ends of these storage sections 70 open to the rear surface of the front portion 16a of the first main body 16, and the front ends of the storage sections 70 open to the rear surface of the front portion 16a formed by the cutouts 68. The angle of the line connecting the front and rear ends of the storage sections 70 is perpendicular to the cutouts 68. A first female screw section 72 is formed on the inner periphery of the storage section 70.

[0028] 4, a differential screw 74 is housed in the housing 70. The differential screw 74 is formed by a cylindrical thread 76 and a fixing screw 78 that is threaded onto the inner periphery of the cylindrical thread 76.

[0029] As shown in Figure 4, a first male thread portion 80 is formed on the outer periphery of the cylindrical screw 76. This first male thread portion 80 is threadedly engaged with the first female thread portion 72 of the storage section 70, allowing the cylindrical screw 76 to rotate inside the storage section 70. A second female thread portion 82 is formed on the inner periphery of the cylindrical screw 76. A hexagonal hole 88 is formed in the front end of the cylindrical screw 76. A hexagonal wrench (not shown) is fitted into this hexagonal hole 88 to rotate the cylindrical screw 76.

[0030] As shown in FIG. 4, a second male thread portion 84 is formed on the outer periphery of the fixing screw 78. The second female thread portion 82 of the cylindrical thread 76 and the second male thread portion 84 of the fixing screw 78 are threadedly engaged. The rear end of the fixing screw 78, which passes through the storage section 70 and the cylindrical thread 76, is threadedly engaged with the front surface of the rear portion 16b formed by the notch portion 68, and is fixed by a nut 86. The thickness of this nut 86 is formed to be thinner than the thickness of the notch portion 68 in the front-to-rear direction. In addition, a hexagonal hole 90 is formed in the front end of the fixing screw 78. A hexagonal wrench (not shown) is fitted into this hexagonal hole 90, and the fixing screw 78 is rotated to thread it into the front surface of the rear portion 16b.

[0031] The pitch distance between the first female thread portion 72 and the first male thread portion 80 is larger than the pitch distance between the second female thread portion 82 and the second male thread portion 84. For example, suppose the pitch distance of the first male thread portion 80 is 1.5 mm and the pitch distance of the second male thread portion 84 is 1.25 mm. Then, when the cylindrical screw 76 rotates once, the set screw 78 moves forward and backward by 0.25 of the difference in pitch distances (1.5 - 1.25). For example, when the set screw 78 moves forward, the distance between the notches 68 narrows, and the rear portion 16b rotates around a fulcrum P at the bottom of the notch 68. This allows adjustment of the front-to-rear dimension of the discharge port 42, which is the distance between the first coating blade tip 36 and the second coating blade tip 38. This adjustment can be made in accordance with the differential screws 74 provided in the left and right directions.

[0032] (3) Structure of bending device 8 The structure of the bending device 8 will be described with reference to FIGS.

[0033] The bending device 8 corrects the lateral deflection of the die 14, and as shown in Fig. 3, is a substantially rectangular parallelepiped provided below the die 14, with a pair of left and right arms 52 erected from both left and right sides of the top surface. Meanwhile, a pair of left and right support shafts 54, 54 protrude from both side surfaces of the first main body 16 and are rotatably supported by the pair of left and right arms 52. As a result, the die 14 is rotatably disposed above the bending main body 50 of the bending device 8 and fixed at a specific position.

[0034] 1 and 3, a vertically moving part 56 is provided inside the bend main body 50, and a cylindrical die pressing part 58 is provided at the upper end of the vertically moving part 56. A cotter provided on the vertically moving part 56 moves horizontally to move the die pressing part 58 up and down.

[0035] As shown in Figures 1 to 3, the die pressing portion 58 is disposed on the underside of the base 20 so that a perpendicular line S dropped from the center O of the rotation shaft 13 of the backup roll 12 passes through the first coating cutting edge 36 and the center of the cylindrical die pressing portion 58.

[0036] (4) Structure for making coating thickness constant at die 14 In the die 14 of the coating device 10, when applying a coating liquid to the web W with a constant coating thickness in the left-right direction, it is necessary to make the coating pressure of the coating liquid on the web W constant in the left-right direction and as high as possible. To solve this problem, the inventors designed the die 14 to have the following structure.

[0037] (4-1) First structure The first structure will be described.

[0038] In this embodiment, as shown in Figure 5, the lower peripheral surface of the backup roll 12 is arc-shaped, so when a perpendicular line S is dropped from the center O of the rotation shaft 13 of the backup roll 12, the perpendicular line S passes through the front part of the first coating cutting edge 36 of the first body 16 of the die 14.

[0039] As shown in FIG. 5, the upper surfaces of the first coating blade 36 and the second coating blade 38 are flat, and the upper surfaces of the first coating blade 36 and the second coating blade 38 are at the same height.

[0040] As shown in Figure 5, if the distance between the rear of the upper surface of the first coating cutting edge 36 and the lower peripheral surface of the backup roll 12 is A, the distance between the front of the upper surface of the second coating cutting edge 38 and the lower peripheral surface is B, the distance between the rear of the upper surface of the first coating cutting edge 36 and the lower peripheral surface is C, and the distance between the front of the upper surface of the first coating cutting edge 36 and the lower peripheral surface is D, then the relationship is A>B>C>D.

[0041] With the above-described structure, the distance D between the front of the upper surface of the first coating blade tip 36 and the lower peripheral surface of the backup roll 12 is closest, and the highest coating pressure is applied at this closest position. Therefore, coating is performed at this position where the coating pressure is highest. In other words, the distance D between the front of the upper surface of the first coating blade tip 36 and the lower peripheral surface of the backup roll 12 is the coating distance and determines the coating thickness. Furthermore, because the upper surfaces of the first coating blade tip 36 and the second coating blade tip 38 are set at the same height and have an order of A>B>C>D, the web W can run smoothly, and the coating pressure applied to the web W gradually increases, reaching its highest coating pressure at position D where coating is performed.

[0042] (4-2) Second structure The second structure will be described.

[0043] To increase the coating pressure, it is better to make the first coating blade tip 36 sharper and thinner. To achieve this, it is necessary to reduce the dimension of the upper part of the first coating blade tip 36 in the front-to-rear direction.

[0044] However, if the first coating blade tip 36 is made too sharp and thin, the coating fluid will leak out in front of the first coating blade tip 36, causing leakage.

[0045] Therefore, in this embodiment, as shown in FIG. 5, the upper surfaces of the first coating blade tip 36 and the second coating blade tip 38 are made flat to prevent leakage of the coating liquid as much as possible.

[0046] Furthermore, in order to make the first coating cutting edge 36 as sharp as possible, the dimension α of the top surface of the first coating cutting edge 36 in the front-to-rear direction was made smaller than the dimension β of the top surface of the second coating cutting edge 38 in the front-to-rear direction, as shown in Figure 5. In other words, β > α. Note that the second coating cutting edge 38 does not need to have a thin dimension in the front-to-rear direction because no final coating pressure is applied during coating, and therefore the dimension was set to prevent leakage of the coating fluid.

[0047] Due to this difference in the front-to-rear dimensions, a higher coating pressure is applied to the first coating blade tip 36 than to the second coating blade tip 38, allowing the coating liquid to be applied to the web W with the desired coating thickness.

[0048] (4-3) Third Structure The third structure will now be described. As described above, a higher coating pressure is applied to the first coating cutting edge 36 than to the second coating cutting edge 38, and the dimension α of the top surface of the first coating cutting edge 36 in the front-to-rear direction is shorter than the dimension β of the top surface of the second coating cutting edge 38 in the front-to-rear direction. As shown by the two-dot chain lines in Figures 4 and 5, the first coating cutting edge 36 tends to bend forward, increasing the dimension γ of the discharge outlet 42 in the front-to-rear direction. In particular, a stronger coating pressure is applied to the center of the die 14 in the left-to-right direction, making the first coating cutting edge 36 more likely to bend forward. When the first coating cutting edge 36 bends forward in this way, the dimension γ of the discharge outlet 42 in the front-to-rear direction increases, resulting in an inconsistent coating thickness in the left-to-right direction.

[0049] Therefore, in this embodiment, in order to prevent the first coating cutting edge 36 from bending forward as shown by the two-dot chain lines in Figures 4 and 5, a cutout 68 is provided in the first body 16 and a differential screw 74 is provided in the storage section 70, as shown in Figure 4. When the cylindrical screw 76 of the differential screw 74 in the storage section 70 is rotated, the fixing screw 78 moves rearward, causing the rear section 16b of the first body 16 to rotate counterclockwise around fulcrum P at the bottom of the cutout 68, thereby correcting the forward bending of the first coating cutting edge 36.

[0050] If the pitch interval of the first male thread portion 80 and the pitch interval of the second male thread portion 84 are the same, it is difficult to finely adjust the movement distance of the fixing screw 78. However, if the pitch interval of the first male thread portion 80 and the pitch interval of the second male thread portion 84 are larger, it is easier to finely adjust. For example, if the pitch interval of the first male thread portion 80 is 1.5 mm and the pitch interval of the second male thread portion 84 is 1.25 mm, then one rotation of the cylindrical screw 76 will move the fixing screw 78 forward and backward by 0.25 of the difference in pitch intervals (1.5 - 1.25). This movement distance does not directly reflect the amount of rotation of the cylindrical screw 76. However, because the pitch interval of the second male thread portion 84 is smaller than the pitch interval of the first male thread portion 80, the movement distance of the fixing screw 78 can be adjusted by finely moving it relative to the amount of rotation of the cylindrical screw 76.

[0051] (4-4) Fourth Structure The fourth structure will now be described. To further increase the precision of adjusting the position of the first coating blade tip 36, it is preferable to increase the distance (radius) R between the fulcrum P at the bottom of the notch 68 and the front part of the upper part of the first coating blade tip 36. Furthermore, to make the rear part 16b easier to bend, it is desirable to reduce the dimension of the rear part 16b in the front-to-rear direction, but to avoid reducing the strength of the entire first main body 16.

[0052] Therefore, in this embodiment, as shown in Fig. 4, the inclination angle of the first inclined surface 22 of the first main body 16 is set to two stages. The first steeply inclined surface 60 is provided to make the rotating rear portion 16b thinner and easier to bend, while the radius R is increased. The reason for increasing the radius R is that a notch 68 is provided in the first gently inclined surface 62 in the front portion 16a, and the fulcrum P is at the bottom of this notch 68, so the radius R is increased to be greater than the depth of the notch 68 to the fulcrum P.

[0053] 4, the first gently inclined surface 62 is provided in the front portion 16a, so that it is possible to obtain strength similar to that obtained when the entire first inclined surface 22 is formed solely by the inclination angle of the first gently inclined surface 62. That is, in the first main body 16 of this embodiment, the entire first inclined surface 22 is formed solely by the inclination angle of the first gently inclined surface 62, and the first steeply inclined surface 60 protrudes, so that the strength of the entire first main body 16 is not reduced.

[0054] Furthermore, as shown in FIG. 4, in the second main body 18, the entire second inclined surface 26 is formed only by the inclination angle of the second gently inclined surface 66, and the second steeply inclined surface 64 also protrudes, so the strength of the entire second main body 18 is not reduced.

[0055] (5) Function of bending device 8 The pressure of the coating fluid discharged from the discharge port 42 causes the upper end of the die 14 to bend downward toward the center in the left-right direction. To prevent this bending, as shown in FIG. 3, the die pressing unit 58 of the bending device 8 presses the lower surface of the base 20 of the die 14. In this embodiment, as shown in FIG. 2, the pressing position of the die pressing unit 58 is the center in the left-right direction and directly below the center O of the rotation shaft 13 of the backup roll 12 in the back-to-front direction. The reason why the position directly below the center O of the rotation shaft 13 of the backup roll 12 is pressed will be explained below. As described above, the distance between the front part of the upper surface of the first coating cutting edge 36 and the lower peripheral surface of the backup roll 12 is closest at the position directly below the center O of the rotation shaft 13 of the backup roll 12, and this closest position is where the greatest coating pressure is applied. Therefore, bending is most likely to occur in this portion in the back-to-front direction. Therefore, in this embodiment, the center O of the rotation shaft 13 of the backup roll 12 and a position directly below the front part of the upper surface of the first coating blade edge 36 are pressed in the rear-front direction to prevent bending.

[0056] Furthermore, when the base 20 and the first body 16 are bent, the second body 18 fixed to the first body 16 can also be bent at the same time.

[0057] (6) Operating state of the coating device 10 The following describes the operating state of the coating device 10. As shown in Fig. 1, the backup roll 12 is rotated counterclockwise, and the web W on the lower peripheral surface is made to travel from rear to front (upstream to downstream).

[0058] 1 and 2, a coating liquid is supplied from a pump (not shown) through a hose 48 and a supply port 46 to a liquid reservoir 24 of a die 14 disposed below the backup roll 12. The coating liquid supplied to the liquid reservoir 24 rises through a liquid passage 40 and is discharged from a discharge port 42. The discharged coating liquid is applied to the surface of a web W running on the lower peripheral surface of the backup roll 12.

[0059] The coating thickness of the coated web W in the left-right direction of the coated portion is inspected, and if the coating thickness is uniform in the left-right direction, coating is continued as is.

[0060] However, in the case of a portion where the coating thickness is not uniform in the left-right direction and is thicker than a predetermined coating thickness, as shown in Figure 4, the cylindrical screw 76 of the differential screw 74 in the storage section 70 of the first main body 16, which is located at a position corresponding to the thick portion, is rotated to increase the force pressing rearward on the rear portion 16b, thereby adjusting the dimension γ of the discharge outlet 42 in the front-to-rear direction and making the coating thickness on the web W constant.

[0061] (7) Effects According to this embodiment, the dimension of the first coating blade tip 36 in the front-rear direction is shorter than the dimension of the second coating blade tip 38, so that the coating pressure can be increased.

[0062] Furthermore, since the tops of the first coating blade tip 36 and the second coating blade tip 38 are flat, the coating liquid is less likely to leak.

[0063] Furthermore, even if the first coating blade tip 36 is bent forward due to the coating pressure of the coating liquid, the cylindrical screw 76 of the differential screw 74 in the storage section 70, which is located at a position where the coating pressure is high, is rotated to increase the force pressing the rear portion 16b backward, thereby adjusting the dimension γ of the discharge outlet 42 in the front-to-rear direction and making the coating thickness on the web W constant.

[0064] Furthermore, since the first inclined surface 22 of the first main body 16 is composed of two stages, a first steeply inclined surface 60 and a first gently inclined surface 62, and the notch 68 is provided on the first gently inclined surface 62, the radius R, which is the distance between the fulcrum P, which is the center of rotation of the rear part 16b, and the front upper end of the first coating blade tip 36, is longer than the depth of the notch 68, thereby increasing the accuracy with which the first coating blade tip 36 is moved.

[0065] Furthermore, in the first main body 16, the first inclined surface 22 is formed entirely by the inclination angle of the first gentle inclined surface 62, and the first steep inclined surface 60 also protrudes, so the strength of the entire first main body 16 is not reduced.

[0066] Furthermore, in the second main body 18, the second inclined surface 26 is formed entirely by the inclination angle of the second gently inclined surface 66, and the second steeply inclined surface 64 also protrudes, so the strength of the entire second main body 18 is not reduced.

[0067] Furthermore, even if the center of the die 14 is about to bend downward in the left-right direction due to the coating pressure, because the first body 16 and the base 20 are integrally formed, the center of the underside of the base 20 can be pressed upward by the die pressing unit 58 of the bending device 8, keeping it horizontal. At this time, because the first body 16 is erected from the front of the base 20, the center of the die pressing unit 58 can be positioned directly below the front surface of the first coating cutting edge 36 (directly below the center O of the rotation shaft 13 of the backup roll 12), as shown in Figure 2, and the portion that is most subject to the coating pressure in the left-right and back-to-front directions can be bent.

[0068] Furthermore, the first body 16 and the second body 18 are fixed together with fastening bolts, and because the second body 18 is smaller than the first body 16, bending the first body 16 allows the second body 18 to bend at the same time. In particular, because an attachment space 44 is provided between the base 20 and the second body 18, the second body 18 can be bent reliably.

[0069] (8) Example of change In the above embodiment, the shim 28 is a U-shaped metal plate and is composed of left and right peripheral portions 30, 32 and a lower peripheral portion 34. Alternatively, comb-tooth portions may be protruded upward from the lower peripheral portion 34 at predetermined intervals to form a comb-tooth shim 28, allowing stripe coating rather than coating the entire web W with the coating liquid.

[0070] The structure for pressing the die pressing unit 58 of the bending device 8 is not limited to the cotter of this embodiment, and other structures may be used. For example, the vertical movement unit 56 may have a motor, an actuator, or the like, and move the die pressing unit 58 up and down.

[0071] Furthermore, in the above embodiment, the liquid reservoir 24 is provided in the first body 16, but it may be provided in the second body 18 instead.

[0072] Although one embodiment of the present invention has been described above, this embodiment is presented by way of example and is not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0073] 8 bending device, 10 coating device, 12 backup roll, 14 die, 16 first body, 18 second body, 20 base, 28 shim, 36 first coating blade, 38 second coating blade, 40 liquid passage, 42 discharge port, 44 mounting space, 58 die pressing portion, 68 notch, 70 storage portion, 72 first female thread portion, 74 differential screw, 76 cylindrical screw, 78 fixing screw, 80 first male thread portion, 82 second female thread portion, 84 second male thread portion, 16a front portion, 16b rear portion

Claims

1. A coating device having a backup roll on the lower peripheral surface of which a web runs in the front-to-rear direction, and a die disposed below the backup roll, The die is a first body having an upper surface that slopes downward toward the front to form a first inclined surface and an upper vertical cross section that is triangular; a second body that is combined with the rear surface of the first body and has an upper surface that is formed with a second inclined surface that slopes downward toward the rear, and has an upper vertical cross section that is formed in a triangular shape; a shim sandwiched between a rear surface of the first body and a front surface of the second body; a coating liquid reservoir provided on a rear surface of the first body or a front surface of the second body; a liquid passage for the coating liquid that is formed in a vertical direction from the liquid reservoir between the first main body and the second main body and is surrounded by the shim; a first coating blade tip protruding in the left-right direction from an upper rear end portion of the first inclined surface of the first body; a second coating blade tip protruding in the left-right direction from a front upper end portion of the second inclined surface of the second body; a slit-shaped discharge outlet for the coating liquid, located at an upper end of the liquid passage and extending in the left-right direction between the first coating blade tip and the second coating blade tip; a notch formed downward from the first inclined surface and across the entire width of the first body, dividing the upper portion of the first body into a front portion and a rear portion; a cylindrical storage section that is perpendicular to the cutout and has a front end that opens to the front surface of the front part of the first body and a rear end that opens to the rear surface of the front part of the first body; a first female screw portion provided on an inner periphery of the storage portion; A differential screw housed in the housing; and The upper surface of the first coating blade tip has a flat shape, The upper surface of the second coating blade tip has a flat shape, the upper surface of the first coating blade tip and the upper surface of the second coating blade tip are at the same height; a dimension of the upper surface of the first coating blade tip in the front-to-rear direction is shorter than a dimension of the upper surface of the second coating blade tip in the front-to-rear direction; A plurality of the storage portions are formed in the first body along the left-right direction, The differential screw has a cylindrical cylindrical screw having a first male screw portion formed on its outer periphery and threaded into the first female screw portion, and a fixing screw housed in the cylindrical screw and having a second male screw portion formed on its outer periphery and threaded into a second female screw portion formed on the inner periphery of the cylindrical screw, a rear end of the fixing screw is fixed to a rear portion of the first body; The pitch interval of the first male thread portion on the outer periphery of the cylindrical thread is larger than the pitch interval of the second female thread portion on the inner periphery of the cylindrical thread. A coating device characterized by:

2. A perpendicular line from the center of the rotation axis of the backup roll passes through a front part of the upper surface of the first coating blade tip. The coating device according to claim 1 .

3. the first inclined surface is composed of a first steeply inclined surface extending from a front portion of the first coating cutting edge and a first gently inclined surface extending from a front portion of the first steeply inclined surface, and the inclination angle of the first steeply inclined surface with respect to a horizontal plane is larger than the inclination angle of the first gently inclined surface with respect to the horizontal plane; The notch portion is formed on the first gently inclined surface. The coating device according to claim 1 .

4. the second inclined surface is composed of a second steeply inclined surface extending from a rear portion of the second coating cutting edge and a second gently inclined surface extending from a rear portion of the second steeply inclined surface, and the inclination angle of the second steeply inclined surface with respect to the horizontal plane is larger than the inclination angle of the second gently inclined surface with respect to the horizontal plane; The coating device according to claim 3.

5. a rectangular parallelepiped base portion provided at a bottom of the first main body, protruding rearward from the first main body, and extending in the left-right direction; an attachment space formed between a front portion of the upper surface of the base and a lower surface of the second body; a bending device disposed below the base portion and configured to horizontally correct deflection of the die in the left-right direction; and A die pressing portion on the upper surface of the bending device presses against the lower surface of the base. The coating device according to claim 2.

6. The perpendicular line passes through the center of the die pressing portion. The coating device according to claim 5.

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