Coating device

Abstract

To provide a coating device which can reduce a thickness of a first coating blade edge as much as possible and prevent expansion of a space of a first discharge port by a coating pressure of a first coating slip when the first coating slip and a second coating slip are applied to a web.SOLUTION: A dimension in a front-back direction of an upper surface of a first coating blade edge 34 is shorter than a dimension in a front-back direction of an upper surface of a second coating blade edge 64. A dimension in a front-back direction of an upper surface of an intermediate coating blade edge 96 is shorter than a dimension in the front-back direction of the upper surface of the second coating blade edge 64. A plurality of storage parts 40 are formed at a first main part 22 along a lateral direction. A differential screw 44 has a tube screw 46 and a fixed screw 48 which is housed in and threadedly engaged with the tube screw 46. A rear end of the fixed screw 48 is fixed to a rear portion of the first main part 22, and a pitch interval of an outer periphery of the tube screw 46 is larger than a pitch interval of an inner periphery of the tube screw 46.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a coating device having a stacking die. [Background technology]

[0002] A stacking die has been proposed that applies two types of coating fluid in layers using a single die. This stacking die has a triangular pointed tip and two side-by-side discharge ports from which a coating fluid is discharged, and the two coating fluids are applied in layers to a web being transported by a backup roll.

[0003] This stacked die is a combination of a first body, an intermediate body, and a second body in the front-to-rear direction, with a first coating blade at the upper end of the first body, an intermediate coating blade at the upper end of the intermediate body, and a second coating blade at the upper end of the second body, with a first slit-shaped outlet formed between the first and intermediate coating blades, and a second slit-shaped outlet formed between the intermediate and second coating blades, with the first coating fluid being ejected from the first outlet and the second outlet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7255051 [Patent Document 2] Patent No. 7381702 Summary of the Invention [Problem to be solved by the invention]

[0005] In the stacking die described above, the slit-shaped first discharge port provided between the first coating blade tip and the intermediate coating blade tip may have a greater distance in the front-to-rear direction toward the center due to the coating pressure of the coating fluid when the coating fluid is applied to the web. On the other hand, it is preferable to thin the first coating blade tip to increase the coating pressure when applying the coating fluid to the web. However, a problem with thinning the first coating blade tip is that the distance between the first discharge ports in the front-to-rear direction is more likely to increase due to the coating pressure.

[0006] 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 first coating liquid and a second coating liquid onto a web, and can prevent the spacing between the first discharge outlets from widening due to the coating pressure of the first coating liquid. [Means for solving the problem]

[0007] The present invention relates to a coating device having a backup roll over a lower peripheral surface of which a web travels in a front-to-rear direction, and a stacking die disposed below the backup roll for stacking and coating the web with a first coating liquid and a second coating liquid. The stacking 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; an intermediate body that is combined with the rear surface of the first body and has a triangular vertical cross section; and a second body that is combined with the rear surface of the intermediate 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 first shim sandwiched between the first body and the intermediate body; a second shim sandwiched between the intermediate body and the second body; a first liquid reservoir for the first coating liquid provided on the rear surface of the first body; a first liquid passage for the first coating liquid formed in the vertical direction from the first liquid reservoir between the first body and the intermediate body and surrounded by the first shim; a second liquid reservoir for the second coating liquid provided on the front surface of the second body; and a second liquid passage for the second coating liquid formed in the vertical direction from the second liquid reservoir between the intermediate body and the second body and surrounded by the second shim. a first coating blade tip that protrudes in the left-right direction from the rear upper end of the first inclined surface of the first body; an intermediate coating blade tip that has a trapezoidal vertical cross section and is formed in the left-right direction at the upper end of the intermediate body; a second coating blade tip that protrudes in the left-right direction from the front upper end of the second inclined surface of the second body; a first discharge port for the first coating liquid that is located at the upper end of the first liquid passage and has a slit shape that extends in the left-right direction between the first coating blade tip and the intermediate coating blade tip; and a second discharge port for the first coating liquid that is located at the upper end of the second liquid passage and has a slit shape that extends in the left-right direction between the intermediate coating blade tip and the second coating blade tip. a first discharge port for the coating liquid; a cutout portion that is formed downward from the first inclined surface and across the entire width of the first body, dividing the upper part of the first body into a front portion and a rear portion; a cylindrical storage portion that is perpendicular to the cutout portion and has a front end that opens at the front surface of the front portion of the first body and a rear end that opens at the rear surface of the front portion of the first body; a first female screw portion provided on the inner periphery of the storage portion; and a differential screw that is stored in the storage portion, wherein the upper surface of the first coating blade tip is flat, the upper surface of the intermediate coating blade tip is flat, and the upper surface of the second coating blade tip is flat,the top surface of the first coating cutting edge, the top surface of the intermediate coating cutting edge, and the top surface of the second coating cutting edge are at the same height, the front-to-rear dimension of the top surface of the first coating cutting edge is shorter than the front-to-rear dimension of the top surface of the second coating cutting edge, the front-to-rear dimension of the top surface of the intermediate coating cutting edge is shorter than the front-to-rear dimension of the top surface of the second coating cutting edge, a plurality of the storage portions are formed in the first body along the left-to-right direction, the differential screw has 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 that is stored in the cylindrical screw and has 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, a rear end of the fixing screw is fixed to a rear part of the first body, and the pitch interval of the first male thread portion on the outer periphery of the cylindrical screw is greater than the pitch interval of the second female thread portion on the inner periphery of the cylindrical screw. [Effects of the Invention]

[0008] 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 first coating fluid. Also, even if the first coating blade tip bends due to the coating pressure and the distance between the first discharge port in the front-to-rear direction increases, the cylindrical thread of the actuating bolt is rotated, causing the fixing screw to move rearward by the difference in pitch between the first male thread portion and the second male thread portion, and the rear part of the first body is moved rearward by the same amount, preventing the first coating blade tip from moving forward and preventing the distance between the first discharge port in the front-to-rear direction from increasing. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a right side view of a coating device showing one embodiment of the present invention. FIG. [Figure 2] FIG. 10 is a vertical cross-sectional view of the differential bolt position as viewed from the right side of the stacking die. [Figure 3] FIG. [Figure 4] FIG. 2 is an exploded perspective view of a stacked die. [Figure 5] 1 is a vertical cross-sectional view of the stacked die at the center in the left-right direction as viewed from the right side. [Figure 6]FIG. 2 is a vertical cross-sectional view of the stacking die as viewed from the right side, showing a position where the first body and the intermediate body are fixed together with a first fastening bolt. [Figure 7] FIG. 2 is a vertical cross-sectional view of the stacking die as seen from the right side, showing a position where the second body and the intermediate body are fixed together with a first fastening bolt. [Figure 8] FIG. 1 is an enlarged vertical cross-sectional view of the stacked die as viewed from the upper right side. [Figure 9] FIG. 2 is an enlarged vertical cross-sectional view of a backup roll, a first coating blade edge, an intermediate coating blade edge, and a second coating blade edge. DETAILED DESCRIPTION OF THE INVENTION

[0010] 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 9. The long web W may be a film, metal foil, metal mesh, paper, fabric, or the like. The coating device 10 of this embodiment coats the web W with two layers of different first and second coating liquids. Here, different coating liquids do not refer to coating liquids with completely different components, but also includes coating liquids with the same components but different viscosities.

[0011] (1) Coating device 10 The configuration of a coating device 10 will be described with reference to Figures 1 and 3. The coating device 10 has a backup roll 12 that rotates at a predetermined rotational speed, a stacking die 14 disposed below the backup roll 12, and a bending device 16 disposed below the stacking die 14. A rotation shaft 18 of the backup roll 12 is disposed horizontally in the left-right direction, and the web W is held by the lower peripheral surface of the backup roll 12 and travels forward from rear to front (traveling from left to right in Figure 1, i.e., from upstream to downstream).

[0012] The stacking die 14 is arranged horizontally in the left-right direction below the backup roll 12, and coats the first coating liquid and the second coating liquid in two layers onto the web W that is running while being held by the lower peripheral surface of the backup roll 12.

[0013] The bending device 16 corrects bending of the stacking die 14 in the left-right direction, and is provided below the stacking die 14, and also plays a role in supporting the stacking die 14 in the left-right direction and horizontally.

[0014] (2) Stacked die 14 Next, the structure of the stacking die 14 will be described with reference to Figures 1 to 7. The base 20 of the stacking die 14 is a rectangular parallelepiped and extends in the width direction of the web W, i.e., in the left-right direction. A first main body 22 is integrally erected from the front upper surface of the base 20. As shown in Figure 2, a first shim 70 and an intermediate main body 24 are arranged behind the first main body 22, and a second shim 80 and a second main body 26 are arranged behind the intermediate main body 24. Each member will be described in turn below.

[0015] (2-1) First body 22 As shown in Figures 2 to 5, the first main body 22 is a rectangular parallelepiped extending in the left-right direction, the front surface of the first main body 22 is a vertical surface, the upper surface has a first inclined surface 30 that slopes downward toward the front, and the upper vertical cross section is triangular.

[0016] The rear surface of the first main body 22 is a vertical surface, and a first liquid reservoir 32 is formed in the left-right direction as shown in Fig. 5. A first supply port 36, through which the first coating liquid is supplied, penetrates horizontally at the center of the first liquid reservoir 32 in the left-right direction.

[0017] A first coating blade tip 34 that extends in the left-right direction, has a rectangular vertical cross section when viewed from the side, and has a horizontal flat top surface, is formed to protrude upward from the upper rear end of the first inclined surface 30 of the first body 22. When a perpendicular line S is dropped from the center O of the rotation shaft 18 of the backup roll 12, the perpendicular line S passes through the front part of the first coating blade tip 34 of the first body 22.

[0018] A pair of left and right shaft base plates 28, 28 are attached to a pair of left and right side surfaces of the first main body 22 with bolts (not shown), and a pair of left and right support shafts 38, 38 protrude from these shaft base plates 28, 28 in the left and right directions.

[0019] (2-2) Intermediate body 24 As shown in FIGS. 2 to 4, the intermediate body 24 is made of a triangular prism extending in the left-right direction, has a triangular cross section, becomes thinner towards the top, and extends in the left-right direction.

[0020] The front surface of the intermediate body 24, which is inclined relative to the vertical direction, is disposed on the rear surface of the first body 22 with a first shim 70 sandwiched therebetween.

[0021] The upper end of the intermediate body 24 has a trapezoidal vertical cross section when viewed from the side, and an intermediate coating cutting edge 96 is formed along the left-right direction. The upper surface of this intermediate coating cutting edge 96 is a horizontal plane. This intermediate coating cutting edge 96 corresponds to the narrowest part of the triangular vertical cross section of the intermediate body 24 at the upper end.

[0022] The intermediate body 24 is disposed above the rear of the base 20, which is integral with the first body 22, and an attachment space 68 is provided between the intermediate body 24 and the base 20. The attachment space 68 is a space whose upper surface is formed by the lower surface of the intermediate body 24, whose lower portion is formed by the upper surface of the base 20, whose rear surface is open, and whose front surface is formed by the rear surface of the first body 22, and whose left and right side portions are open.

[0023] The intermediate body 24 and the first body 22 are fixed together by a plurality of first fastening bolts 90 .

[0024] (2-3) Second body 26 2, 5, and 6, the second body 26 is a rectangular parallelepiped extending in the left-right direction, and is formed so that its vertical dimension is smaller than that of the first body 22. The second body 26 is disposed on the rear surface of the intermediate body 24, which is inclined with respect to the vertical direction, with a second shim 80 sandwiched therebetween, and is fixed by a second fastening bolt 100. The second body 26 is disposed above the base 20.

[0025] The front surface of the second main body 26 is a flat inclined surface. As shown in Fig. 5, a second liquid reservoir 62 is formed in the left-right direction on the front surface of the second main body 26. The second liquid reservoir 62 extends in the left-right direction, and a second supply port 66 for supplying the second coating liquid penetrates the center of the second liquid reservoir 62 in the left-right direction substantially in the front-rear direction.

[0026] The upper surface of the second main body 26 has a second inclined surface 60 formed from its upper front end toward its upper rear end, and the upper vertical cross section of the second main body 26 is triangular.

[0027] A second coating cutting edge 64 is provided along the left-right direction so as to protrude from the upper front end of the second body 26, i.e., the upper front end of the second inclined surface 60. The vertical cross section of this second coating cutting edge 64 when viewed from the side is a parallelogram, and the rear surface of the second coating cutting edge 64 is inclined so that it is positioned more rearward as it goes downward. Furthermore, the upper surface of the second coating cutting edge 64 is a horizontal plane.

[0028] (2-4) 1st Shim 70 2 to 4, the plate-shaped first shim 70 is made of a metal plate with a thickness d and is disposed between the rear surface of the first main body 22 and the front surface of the intermediate main body 24. The first shim 70 is disposed around the periphery of the first liquid reservoir 32 and has an integrated shape including a left side portion 72 disposed on the left side of the first liquid reservoir 32, a right side portion 74 disposed on the right side, and a lower side portion 76 disposed below the first liquid reservoir 32. Two shim holes 78 penetrate the left side portion 72 and the right side portion 74 of the first shim 70.

[0029] (2-5) 2nd shim 80 2 to 4, the second shim 80 is made of a metal plate with a thickness e and is disposed between the rear surface of the intermediate body 24 and the front surface of the second body 26. The second shim 80 is disposed around the second liquid reservoir 62 and has an integrated shape including a left side portion 82 disposed on the left side of the second liquid reservoir 62, a right side portion 84 disposed on the right side, and a lower side portion 86 disposed below the second liquid reservoir 62. Two shim holes 88 penetrate the left side portion 82 and the right side portion 84 of the second shim 80.

[0030] (3) Fixed structure of stacked die 14 The structure of the stacked die 14 in a fixed state will be further described.

[0031] 6, the first body 22, the first shim 70, and the intermediate body 24 are fixed together by a plurality of first fastening bolts 90. The first fastening bolts 90 are threaded into first fastening holes 92 provided on both the left and right sides of the first body 22, the shim holes 78 provided in the first shim 70, and intermediate first fastening holes 94 provided in the intermediate body 24.

[0032] 7, the second body 26, the second shim 80, and the intermediate body 24 are fixed together by a plurality of second fastening bolts 100. The second fastening bolts 100 are threaded into second fastening holes 102 provided in the second body 26, shim holes 88 provided in the second shim 80, and intermediate second fastening holes 104 provided in the intermediate body 24.

[0033] 2, when the first body 22, the first shim 70, the intermediate body 24, the second shim 80, and the second body 26 are combined as described above, a first liquid passage 120 is formed between the first body 22 and the intermediate body 24 above the first liquid reservoir 32, and its upper end becomes a first discharge port 122. The left and right sides of this first liquid passage 120 are closed by the left side portion 72 and the right side portion 74 of the first shim 70, and the dimension of the first liquid passage 120 and the first discharge port 122 in the front-to-rear direction is the same as the thickness d of the first shim 70, as shown in FIG.

[0034] 2, a second liquid passage 124 is formed between the intermediate body 24 and the second body 26 above the second liquid reservoir 62, and its upper end serves as a second discharge port 126. The left and right sides of this second liquid passage 124 are closed by the left and right sides 82 and 84 of the second shim 80, and the dimension of the second liquid passage 124 and the second discharge port 126 in the front-to-rear direction is the same as the thickness e of the second shim 80, as shown in FIG. 9. In this embodiment, the thickness d of the first shim 70 and the thickness e of the second shim 80 are the same.

[0035] The top surfaces of the first coating blade tip 34, the intermediate coating blade tip 96, and the second coating blade tip 64 are horizontal planes and are set at the same height.

[0036] As shown in FIG. 9, the dimension a in the front-rear direction of the first coating cutting edge 34 is the same as the dimension b in the front-rear direction of the intermediate coating cutting edge 96, and the dimension a in the front-rear direction of the top surface of the first coating cutting edge 34 and the dimension b in the front-rear direction of the intermediate coating cutting edge 96 are shorter than the dimension c in the front-rear direction of the second coating cutting edge 64. That is, a=b <cである。

[0037] As shown in FIG. 2 , a notch 58 is provided in the first inclined surface 30 of the first main body 22. This notch 58 is provided across the entire width of the first main body 22 in the left-right direction, with the top of the notch 58 open and the bottom closed. The notch 58 is inclined relative to the vertical direction, and inclined more rearward as it extends downward. The downward inclination angle of the notch 58 is formed so as to be perpendicular to the first inclined surface 30. The closed lower portion of the notch 58 is located slightly above the top of the first liquid reservoir 32. Hereinafter, the first main body 22 located forward of the notch 58 will be referred to as the "front portion 22a," and the first main body 22 located rearward of the notch 58 will be referred to as the "rear portion 22b."

[0038] As shown in Fig. 3, storage sections 40, which are circular cross-sectional spaces, are provided at equal intervals along the left-right direction in the upper part of the front portion 22a of the first main body 22 in the front-rear direction as shown in Fig. 2. As shown in Figs. 2 and 8, the front end of each storage section 40 opens to the front surface of the first main body 22, and the rear end of each storage section 40 opens to the rear surface of the front portion 22a formed by the notch 58. The angle of the line connecting the front and rear ends of each storage section 40 is perpendicular to the notch 58. A first female screw section 42 is formed on the inner periphery of the storage section 40.

[0039] 2 and 8, a differential screw 44 is housed in the housing 40. The differential screw 44 is formed by a cylindrical thread 46 and a fixing screw 48 that is threaded onto the inner periphery of the cylindrical thread 46.

[0040] As shown in Figure 8, a first male thread portion 50 is formed on the outer periphery of the cylindrical screw 46. This first male thread portion 50 is threadedly engaged with the first female thread portion 42 of the storage section 40, allowing the cylindrical screw 46 to rotate inside the storage section 40. A second female thread portion 52 is formed on the inner periphery of the cylindrical screw 46. A hexagonal hole 46a is formed in the front end of the cylindrical screw 46. A hexagonal wrench (not shown) is fitted into this hexagonal hole 46a to rotate the cylindrical screw 46.

[0041] As shown in FIG. 8 , a second male thread portion 54 is formed on the outer periphery of the fixing screw 48. The second female thread portion 52 of the cylindrical thread 46 and the second male thread portion 54 of the fixing screw 48 are threaded together. The rear end of the fixing screw 48, which passes through the storage section 40 and the cylindrical thread 46, is threaded into the front surface of the rear portion 22b formed by the notch portion 58 and is fixed by a nut 56. The thickness of this nut 56 is formed to be thinner than the thickness of the notch portion 58 in the front-to-rear direction. A hexagonal hole 48a is formed in the front end of the fixing screw 48. A hexagonal wrench (not shown) is fitted into this hexagonal hole 48a, and the fixing screw 48 is rotated to pass through the notch portion 58 and screw into the first main body 22.

[0042] As shown in FIG. 8 , the pitch distance between the first female thread portion 42 and the first male thread portion 50 is larger than the pitch distance between the second female thread portion 52 and the second male thread portion 54. For example, suppose the pitch distance of the first male thread portion 50 is 1.5 mm and the pitch distance of the second male thread portion 54 is 1.25 mm. Then, when the cylindrical screw 46 rotates once, the set screw 48 moves in the front-to-rear direction by 0.25 of the difference in the pitch distances (1.5 - 1.25). For example, when the set screw 48 moves forward, the distance between the notches 58 narrows, and the rear portion 22b rotates around a fulcrum P at the bottom of the notch 58. This allows adjustment of the front-to-rear dimension of the first discharge port 122, which is the distance between the first coating blade tip 34 and the second coating blade tip 64. This adjustment can be made in accordance with the differential screws 44 provided in the left and right directions.

[0043] (4) Bending device 16 Next, the relationship between the bending device 16 and the stacking die 14 will be described.

[0044] 1 and 3, the bending device 16 is a substantially rectangular parallelepiped provided below the stacking die 14, with a pair of left and right arms 110, 110 extending upright from both left and right sides of the top surface. Meanwhile, a support shaft 38 protrudes from both left and right sides of the first body 22, and the arm 110 rotatably supports the support shaft 38.

[0045] A vertically moving part 112 is provided inside the bending device 16, and a cylindrical die pressing part 114 is provided at the upper end of this vertically moving part 112. A cotter provided on the vertically moving part 112 moves horizontally, moving the die pressing part 114 up and down.

[0046] (5) Structure that makes coating thickness uniform with stacking die 14 In the stacking die 14 of the coating device 10, when the first coating fluid and the second coating fluid are laminated and coated on the web W at a constant coating thickness in the left-right direction, it is necessary to make the coating pressure of the first coating fluid and the second coating fluid on the web W constant in the left-right direction and as high as possible. To solve this problem, the inventors designed the stacking die 14 to have the following structure.

[0047] (5-1) First structure The first structure will be described.

[0048] As shown in Figure 8, the front part of the upper surface of the first coating blade tip 34 of the first body 22 of the stacking die 14 is positioned directly below the center O of the rotation shaft 18 (at a position where it intersects with the perpendicular line S from the center O).

[0049] Furthermore, the top surface of the first coating blade 34, the top surface of the intermediate coating blade 96, and the top surface of the second coating blade 64 are at the same height.

[0050] Furthermore, the top surface of the first coating blade 34, the top surface of the intermediate coating blade 96, and the top surface of the second coating blade 64 are flat.

[0051] As a result, as shown in Figure 9, if the distance between the rear of the upper surface of the second coating cutting edge 64 and the lower peripheral surface of the backup roll 12 is L1, the distance between the front of the upper surface of the second coating cutting edge 64 and the lower peripheral surface of the backup roll 12 is L2, the distance between the rear of the upper surface of the intermediate coating cutting edge 96 and the lower peripheral surface is L3, the distance between the front of the upper surface of the intermediate coating cutting edge 96 and the lower peripheral surface is L4, the distance between the rear of the upper surface of the first coating cutting edge 34 and the lower peripheral surface is L5, and the distance between the front of the upper surface of the first coating cutting edge 34 and the lower peripheral surface is L6, then L1>L2>L3>L4>L5>L6.

[0052] With the above structure, the top surfaces of the first coating cutting edge 34, intermediate coating cutting edge 96, and second coating cutting edge 64 are set at the same height, and since L1>L2>L3>L4>L5>L6 holds, the coating pressure applied to the web W gradually increases and is closest at the distance L6 between the front part of the top surface of the first coating cutting edge 34 and the lower peripheral surface of the backup roll 12, where the maximum coating pressure is applied. Furthermore, because distance L6 is greater than the thickness of the web W, the web W can run smoothly.

[0053] (5-2) Second structure The second structure will now be described. To further increase the coating pressure of the first coating fluid, it is better to make the first coating blade edge 34 sharper and thinner, and to further increase the coating pressure of the second coating fluid, it is better to make the intermediate coating blade edge 96 sharper and thinner. To achieve this, it is necessary to reduce the front-to-rear dimension of the upper part of the first coating blade edge 34 and also reduce the front-to-rear dimension of the upper part of the intermediate coating blade edge 96.

[0054] However, if the first coating blade edge 34 is made too sharp and thin, the first coating fluid will leak out in front of the first coating blade edge 34, causing liquid leakage.

[0055] Therefore, in this embodiment, as shown in Figures 8 and 9, the upper surfaces of the first coating blade 34, the intermediate coating blade 96, and the second coating blade 64 are made flat to prevent leakage of the coating liquid as much as possible.

[0056] Also, as shown in Figure 9, in order to make the first coating cutting edge 34 as sharp as possible, the front-to-rear dimension a of the upper surface of the first coating cutting edge 34 is made smaller than the front-to-rear dimension c of the second coating cutting edge 64.

[0057] Furthermore, as shown in Figure 9, in order to make the intermediate coating tip 96 as thin as possible, the front-to-rear dimension b of the upper surface of the intermediate coating tip 96 is set to be the same as the front-to-rear dimension a of the upper surface of the first coating tip 34, and is smaller than the front-to-rear dimension c of the upper surface of the second coating tip 64. Note that the second coating tip 64 does not need to be thin in the front-to-rear direction because no final coating pressure is applied during coating, and so the dimension c is set to be less likely to leak of the second coating fluid. Note that even if the second coating fluid leaks rearward from the second discharge port 126, because the longitudinal cross-sectional shape of the second coating tip 64 is a parallelogram, the second coating tip 64 will flow rearward from the inclined rear surface of the second coating tip 64 and will not flow toward the intermediate coating tip 96.

[0058] Due to this difference in the front-to-rear dimensions, a higher coating pressure is applied to the intermediate coating blade tip 96 and the first coating blade tip 34 than to the second coating blade tip 64, allowing the first coating liquid and the second coating liquid to be coated onto the web W to the desired coating thickness.

[0059] (5-3) Third structure The third structure will now be described. As described above, the intermediate coating tip 96 and the first coating tip 34 are subjected to a higher coating pressure than the second coating tip 64, and the dimension a in the front-to-rear direction of the top surface of the first coating tip 34 is shorter than the dimension c in the front-to-rear direction of the top surface of the second coating tip 64. As shown by the two-dot chain line in FIG. 8, the first coating tip 34 tends to bend forward, and the dimension b in the front-to-rear direction of the first discharge port 122 increases. In particular, a large coating pressure is applied to the central portion of the stacking die 14 in the left-to-right direction, so the first coating tip 34 tends to bend forward even more. When the first coating tip 34 bends forward in this way, the dimension d in the front-to-rear direction of the first discharge port 122 increases, and the coating thickness does not remain constant in the left-to-right direction.

[0060] Therefore, in this embodiment, to prevent the first coating cutting edge 34 from bending forward as shown by the two-dot chain line in Figure 8, a notch 58 is provided in the first body 22 and a differential screw 44 is provided in the storage section 40. As shown in Figure 8, when the cylindrical screw 46 of the differential screw 44 in the storage section 40 is rotated, the fixing screw 48 moves rearward, causing the rear portion 22b of the first body 22 to rotate counterclockwise around fulcrum P at the bottom of the notch 58, thereby correcting the forward bending of the first coating cutting edge 34. The radius of rotation R at this time is the distance from fulcrum P to the front part of the top surface of the first coating cutting edge 34.

[0061] Furthermore, if the pitch interval of the first male thread portion 50 and the pitch interval of the second male thread portion 54 are the same, it is difficult to finely adjust the movement dimension of the fixing screw 48.

[0062] However, in this embodiment, as shown in Figure 8, the pitch interval of the first male thread portion 50 is larger than the pitch interval of the second male thread portion 54, making it easier to make fine adjustments. For example, if the pitch interval of the first male thread portion 50 is 1.5 mm and the pitch interval of the second male thread portion 54 is 1.25 mm, then rotating the cylindrical screw 46 will move the fixing screw 48 in the front-to-rear direction by 0.25 mm, which is the difference in pitch intervals (1.5 - 1.25). This movement distance does not directly reflect the amount of rotation of the cylindrical screw 46, but because the pitch interval of the second male thread portion 54 is smaller than the pitch interval of the first male thread portion 50, the movement distance of the fixing screw 48 can be adjusted by moving it more finely than the amount of rotation of the cylindrical screw 46.

[0063] (5-4) Fourth Structure The fourth structure will now be described. As shown in Fig. 9, the dimension b of the upper surface of the intermediate coating blade 96 in the front-to-rear direction is the same as the dimension a of the first discharge port 122 in the front-to-rear direction, making the intermediate coating blade 96 thin and sharp. However, the vertical cross-sectional shape of the upper end of the intermediate coating blade 96 is trapezoidal, unlike the first coating blade 34, which has a rectangular vertical cross-sectional shape. The vertical cross-sectional shape increases in the front-to-rear direction toward the bottom, making the intermediate coating blade 96 less likely to bend even when the coating pressure of the first coating fluid increases. Furthermore, because the coating pressure of the first coating fluid is applied from the front, the intermediate coating blade 96 does not bend forward like the first coating blade 34. Furthermore, because the coating pressure of the second coating fluid is applied to the rear portion of the intermediate coating blade 96, the intermediate coating blade 96 does not bend backward.

[0064] (5-5) Fifth structure The fifth structure will now be described. As shown in Figure 9, the dimension c in the front-to-rear direction of the top surface of the second coating blade tip 64 is longer than the dimension a in the front-to-rear direction of the first discharge port 122 and the dimension b in the front-to-rear direction of the intermediate coating blade tip 96. The longitudinal cross section as viewed from the side is a parallelogram, and the rear surface of the second coating blade tip 64 is inclined so that it is positioned further rearward as it goes downward, so it will not bend backward.

[0065] (6) Function of bending device 16 The pressure of the coating fluid discharged from the first discharge port 122 and the second discharge port 126 causes the upper end of the stacking die 14 to bend downward toward the center in the left-right direction. To prevent this bending, as shown in FIGS. 1 and 3 , the stacking die pressing unit 114 of the bending device 16 presses the lower surface of the base 20 of the stacking die 14. In this embodiment, as shown in FIG. 2 , the pressing position of the stacking die pressing unit 114 is the center in the left-right direction and directly below the center O of the rotation shaft 18 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 18 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 34 and the lower peripheral surface of the backup roll 12 is closest at the position directly below the center O of the rotation shaft 18 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 18 of the backup roll 12 and a position directly below the front part of the upper surface of the first coating blade edge 34 are pressed in the rear-front direction to prevent bending.

[0066] Furthermore, when the base 20 and the first body 22 are bent, the intermediate body 24 and the second body 26 fixed to the first body 22 can also be bent at the same time.

[0067] (7) Operating state of the coating device 10 The following describes the operating state of the coating device 10. In Fig. 1, the web W advances along the lower peripheral surface of the backup roll 12 (running from left to right in Fig. 1).

[0068] 5, the first coating fluid is supplied to the first fluid reservoir 32 from the first supply port 36. The second coating fluid is supplied to the second fluid reservoir 62 from the second supply port 66.

[0069] Next, the second coating liquid is discharged from the second liquid reservoir 62 through the second liquid passage 124 and the second discharge port 126, and is coated onto the surface of the advancing web W.

[0070] Next, the first coating liquid is discharged from the first liquid reservoir 32 through the first liquid passage 120 and from the first discharge port 122. Then, the first coating liquid is coated and layered on top of the second coating liquid that has been applied to the advancing web W.

[0071] (8) Effects According to this embodiment, the longitudinal dimension a of the first discharge port 122 and the longitudinal dimension b of the intermediate coating blade tip 96 are shorter than the longitudinal dimension c of the second coating blade tip 64, so that the highest coating pressure is achieved at the front position of the upper surface of the first coating blade tip 34, and the first coating fluid and the second coating fluid can be applied to a constant coating thickness.

[0072] Furthermore, since the upper surface of the first coating blade 34 and the upper surface of the second coating blade 64 are horizontal planes, it is possible to prevent liquid leakage in front of the first coating blade 34 or behind the second coating blade 64.

[0073] Even if a coating pressure is applied that bends the first coating cutting edge 34 forward, by rotating the cylindrical thread 46 of the differential screw 44 and moving the fixed screw 48 rearward, the rear portion 22b of the first body 22 rotates counterclockwise around fulcrum P at the bottom of the notch 58, thereby correcting the forward bending of the first coating cutting edge 34. In particular, when the cylindrical thread 46 of the differential screw 44 is rotated, the pitch interval of the first male thread portion 50 is larger than the pitch interval of the second male thread portion 54, and therefore this difference in pitch intervals can be used to finely adjust the movement of the fixed screw 48 in the front-to-rear direction based on the rotation of the cylindrical thread 46.

[0074] Furthermore, since the cross-sectional shape of the upper part of the intermediate coating cutting edge 96 is trapezoidal, it is not difficult to bend like the first coating cutting edge 34, which has a rectangular cross-sectional shape, and since the front part of the second coating cutting edge 64 is swollen and the coating pressure of the first coating liquid and the second coating liquid is applied, the intermediate coating cutting edge 96 does not bend forward or backward.

[0075] The front-to-rear dimension c of the upper surface of the second coating blade 64 is longer than the front-to-rear dimension a of the first discharge port 122 and the front-to-rear dimension b of the intermediate coating blade 96, and the longitudinal cross section as viewed from the side is a parallelogram, and the rear surface of the second coating blade 64 is inclined so that it is positioned further rearward as it goes downward, so it does not bend backward. Modified Example

[0076] 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]

[0077] 10 Coating device, 12 Backup roll, 14 Stacking die, 16 Bending device, 18 Rotating shaft, 20 Base, 22 First body, 24 Intermediate body, 26 Second body, 34 First coating blade, 40 Storage section, 42 First female thread, 44 Differential screw, 46 Cylindrical screw, 48 Fixing screw, 50 First male thread, 52 Second female thread, 54 Second male thread, 56 Nut, 58 Notch, 122 First discharge port, 126 Second discharge port, 64 Second coating blade, 70 First shim, 80 Second shim, 96 Intermediate coating blade

Claims

1. a backup roll on whose lower peripheral surface the web travels in the front-to-rear direction; a laminating die disposed below the backup roll for laminating and coating the first coating liquid and the second coating liquid onto the web; In a coating device having The stacked 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; an intermediate body that is combined with a rear surface of the first body and has a triangular vertical cross section; a second body that is combined with the rear surface of the intermediate 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 first shim sandwiched between the first body and the intermediate body; a second shim sandwiched between the intermediate body and the second body; a first liquid reservoir for the first coating liquid provided on a rear surface of the first main body; a first liquid passage for the first coating liquid, which is formed in a vertical direction from the first liquid reservoir to the first main body and the intermediate main body and is surrounded by the first shim; a second liquid reservoir for the second coating liquid provided on a front surface of the second main body; a second liquid passage for the second coating liquid, which is formed in a vertical direction from the second liquid reservoir between the intermediate main body and the second main body and is surrounded by the second 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; An intermediate coating blade tip having a trapezoidal vertical cross section and formed along the left-right direction at the upper end of the intermediate 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 first discharge port for the first coating liquid, the first discharge port being in the shape of a slit and extending in the left-right direction between the first coating blade tip and the intermediate coating blade tip, at an upper end of the first liquid passage; a first discharge port for the second coating liquid, the first discharge port being in the shape of a slit and extending in the left-right direction between the intermediate coating blade tip and the second coating blade tip, at an upper end of the second liquid passage; 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 intermediate coating blade tip is flat, The upper surface of the second coating blade tip has a flat shape, the upper surface of the first coating blade tip, the upper surface of the intermediate 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 dimension of the upper surface of the intermediate 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 having the above.

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 dimension of the upper surface of the first coating blade tip in the front-to-back direction is the same as the dimension of the upper surface of the intermediate coating blade tip in the front-to-back direction. The coating device according to claim 1 .

4. The vertical cross-sectional shape of the first coating blade tip as viewed from the side is rectangular, and the vertical cross-sectional shape of the intermediate coating blade tip as viewed from the side is trapezoidal. The coating device according to claim 1 .

5. a longitudinal cross-sectional shape of the second coating blade tip as viewed from the side is a parallelogram, and a rear surface of the second coating blade tip is positioned further rearward as it approaches the bottom; The coating device according to claim 1 .

6. 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 stacked die in the left-right direction; and A die pressing portion on the upper surface of the bending device presses the lower surface of the base. The coating device according to claim 1 .

7. A perpendicular line from the center of the rotation shaft of the backup roll passes through the front part of the upper surface of the first coating blade tip and passes through the center of the die pressing portion. The coating device according to claim 6.

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