Web conveying device and web coating device

Abstract

To provide a web conveying device and a web coating device that improve the uniformity of tension applied to a web and suppress bending of the web.SOLUTION: A web conveying device 20 includes a right clamping roller pair 21 capable of clamping the right end of a web W and a left clamping roller pair 22 capable of clamping the left end. When the web W is clamped between the clamping roller pairs 21, 22, the right end of the web W in a width direction WD is clamped between an outer portion 23d of a right front-side roller 23 and a right back-side roller 24, and the left end of the web in the width direction WD is clamped between an outer portion 25d of a left front-side roller 25 and a left back-side roller 26. The entire surfaces of inner portions 23c, 25c of the front-side rollers 23, 25 press against the web W. The right back-side roller 24 faces the entire surface of the inner portion 23c of the right front-side roller 23, and the left back-side roller 26 faces the entire surface of the inner portion 25c of the left front-side roller 25.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a web transport device and a web coating device. [Background technology]

[0002] A conventional web transport device for transporting a web is described in Patent Document 1. This web transport device includes first and second transport rollers, a web is stretched between the first and second transport rollers, and the web is transported from the first transport rollers to the second transport rollers. The web transport device includes a pair of first clamping rollers and a pair of second clamping rollers between the first and second transport rollers, which are rotatable so as to clamp both ends of the web being transported in the width direction and pull the ends outward. This makes it possible to suppress flapping of the web during transport. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5915171 Summary of the Invention [Problem to be solved by the invention]

[0004] With the above configuration, for example, if the web shifts in the width direction of the web, a difference may occur between the contact area between the pair of first clamping rollers and the web and the contact area between the pair of second clamping rollers and the web. As a result, the web may be pulled by the pair of first clamping rollers or the pair of second clamping rollers that has the larger contact area. As a result, the tension applied to the web may become uneven across the width direction of the web. This may result in unstable web transport.

[0005] 11, for example, if the web W shifts in the width direction WD of the web W and one end of the web W in the width direction WD protrudes from the side edge of the pair of first nipping rollers 2,2 or the pair of second nipping rollers 3,3, the protruding portion of the web W may be bent by the pressing force received from the pair of first nipping rollers 2,2 or the pair of second nipping rollers 3,3. Although Fig. 11 shows a configuration in which the end of the web W protrudes from the pair of second nipping rollers 3,3, the same applies when the end of the web W protrudes from the pair of first nipping rollers 2,2.

[0006] The present invention has been made in consideration of such problems, and aims to provide a web conveying device that improves the uniformity of the tension applied to the web and suppresses bending of the web, and a web coating device using the same. [Means for solving the problem]

[0007] One aspect of the present invention is A web transport device that transports a web having a front surface and a back surface, a right clamping roller pair arranged to be able to clamp a position near the right end of the web as viewed from the upstream side in the conveying direction and to be able to rotate as the web is conveyed; a left clamping roller pair arranged symmetrically to the right clamping roller pair in the web conveying direction, capable of clamping a position near the left end of the web as viewed from the upstream side in the web conveying direction, and rotatable as the web is conveyed; the rotation axis of the right clamping roller pair is disposed at a position rotated clockwise at a predetermined acute angle with respect to the width direction of the web when viewed from the normal direction of the surface of the web, the other of the rotation shafts of the left clamping roller pair is disposed at a position rotated counterclockwise at a predetermined acute angle with respect to the width direction of the web when viewed from the normal direction to the surface of the web, The right clamping roller pair is a right front roller disposed on the front surface side of the web; a right back roller disposed on the back side of the web, The left clamping roller pair is a left front roller disposed on the back side of the web; a left back roller disposed on the back side of the web, The right front-side roller and the left front-side roller are each an inner portion disposed on the inner side in the width direction of the web; an outer portion disposed on the outer side of the web in the width direction and having an outer peripheral surface that is more slippery than the inner portion; With the web sandwiched between the right sandwiching roller pair and the left sandwiching roller pair, a right end portion of the web in the width direction is sandwiched between the outer portion of the right front-side roller and the right back-side roller, the left end portion of the web in the width direction is sandwiched between the outer portion of the left front-side roller and the left back-side roller, the entire surfaces of the inner portions of the right and left front-side rollers press against the web; In the web transport device, the right back roller faces the entire surface of the inner side of the right front roller, and the left back roller faces the entire surface of the inner side of the left front roller.

[0008] Another aspect of the present invention is A web coating device that applies a coating material to at least one of the front and back surfaces of a web being conveyed, The web transport device; a coating material discharge device that applies the coating material to at least one of the front surface and the back surface of the web. [Effects of the Invention]

[0009] According to one and other aspects of the present invention, even when the web moves in the width direction, the contact area between the inner portion of the right front roller and the web and the contact area between the inner portion of the left front roller and the web can be prevented from changing. This prevents a difference from occurring between the tension applied to the web by the right clamping roller pair and the tension applied to the web by the left clamping roller pair. As a result, the uniformity of the tension applied to the web can be improved.

[0010] Furthermore, according to one and other aspects of the present invention, when the web is clamped between the right clamping roller pair and the left clamping roller pair, the right end of the web in the width direction is clamped between the right back roller and the outer portion of the right front roller, and the left end of the web in the width direction is clamped between the left back roller and the outer portion of the left front roller, thereby preventing the left and right ends of the web in the width direction from bending due to the pressing force applied from the right clamping roller pair or the left clamping roller pair.

[0011] As described above, according to the above aspect, it is possible to provide a web conveying device in which the uniformity of the tension applied to the web is improved and bending of the web is suppressed, and a web coating device using the same. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a diagram showing a schematic configuration of a web coating device according to a first embodiment. [Figure 2] 3 is a view of the right clamping roller pair of the web transport device according to the first embodiment, viewed from the roller axis direction. FIG. [Figure 3] 2 is a view of a right clamping roller pair and a left clamping roller pair of the web transport device according to the first embodiment, viewed from a direction perpendicular to the roller axes. FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] 5 is a diagram showing a state in which the web is displaced from the position shown in FIG. 4 in the web transport device according to the first embodiment. FIG. [Figure 6]4 is a diagram showing a web transport device according to a second embodiment, and is a cross-sectional view corresponding to the cross-section taken along line IV-IV in FIG. [Figure 7] 4 is a diagram for explaining the effect of the web transport device according to the second embodiment, and is a diagram showing a cross section corresponding to the cross section taken along line IV-IV in FIG. [Figure 8] 4 is a diagram showing a web transport device according to a third embodiment, and is a cross-sectional view corresponding to the cross-section taken along line IV-IV in FIG. [Figure 9] 4 is a diagram showing a web transport device according to a fourth embodiment, and is a cross-sectional view corresponding to the cross-section taken along line IV-IV in FIG. [Figure 10] 4 is a diagram showing a web transport device according to a fifth embodiment, and is a cross-sectional view corresponding to the cross-section taken along line IV-IV in FIG. [Figure 11] FIG. 4 is a diagram showing a web transport device according to the prior art, and is a cross-sectional view corresponding to the cross-section taken along line IV-IV in FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0013] (Embodiment 1) 1. Schematic configuration of web coating equipment A first embodiment in which a web conveying device according to the present invention is applied to a web coating device will be described with reference to Fig. 1. As shown in Fig. 1, the web coating device 1 of this embodiment includes a cutting device 10, a web conveying device 20, a first coating material discharging device 30, a second coating material discharging device 40, a drying device 50, and the like.

[0014] The web W has a front surface Wa and a back surface Wb. However, the front surface Wa and back surface Wb of the web W are expressions used for convenience to distinguish one side from the other side of the web W. Therefore, in this embodiment, the front surface Wa and back surface Wb of the web W are not particularly distinguished, and for example, the front surface Wa of the web W and the back surface Wb of the web W may be reversed.

[0015] The slitting device 10 forms through holes (not shown) in the web W being transported. The web transport device 20 transports the web W in the transport direction CD while stretching the web W in the width direction WD. The first coating material discharge device 30 discharges the coating material S onto the front surface Wa of the web W while transporting the web W. The second coating material discharge device 40 discharges the coating material S onto the back surface Wb of the web W while transporting the web W. The drying device 50 dries the coating material S applied to both surfaces Wa, Wb of the web W.

[0016] The web coating device 1 is arranged between an unwinding device 70 that unwinds the web W and a winding device 80 that winds up the web W, and includes, from upstream to downstream in the conveying direction CD of the web W, a cutting device 10, a web conveying device 20, a first coating material discharge device 30, a second coating material discharge device 40, a drying device 50, and a conveying roller 60 in this order.

[0017] The rotating shaft 71 of the unwinding device 70 and the rotating shaft 81 of the winding device 80 are arranged parallel to and side by side. The web W is set in a rolled state on the unwinding device 70. The rolled web W is then unwound from the unwinding device 70, passes through the devices 10, 20, 30, 40, and 50 in the above-mentioned arrangement order, and is wound onto the winding device 80 via the conveying roller 60.

[0018] 1, the cutting device 10 includes a cutting roller 11 having a plurality of cutting edges 12 protruding from its peripheral surface and rotatable about a roller shaft 11a as the web W is conveyed. The cutting rollers 11 are arranged diagonally above the unwinding device 70 at a predetermined distance so that the roller shaft 11a and the rotation shaft 71 of the unwinding device 70 are parallel to each other.

[0019] A plurality of cutting edges 12 (12 in this example) are provided at regular intervals in the axial direction and at regular angular intervals in the circumferential direction on the peripheral surface of the incision roller 11. The cutting edges 12 can linearly incise the web W being conveyed in the conveying direction CD. Each cutting edge 12 forms a through-hole (not shown) of a predetermined shape in the web W.

[0020] 3 and 4, the web transport device 20 includes a right clamping roller pair 21 and a left clamping roller pair 22. The right clamping roller pair 21 includes a right front side roller 23 and a right back side roller 24. The left clamping roller pair 22 includes a left front side roller 25 and a left back side roller 26.

[0021] The right clamping roller pair 21 is arranged to be able to clamp a position of the conveyed web W near the right end of the web W as viewed from the upstream side in the conveying direction CD of the web W, and to be able to rotate as the web W is conveyed. The right front-side roller 23 includes a roller shaft 23a and a front-side roller main body 23b arranged radially outward from the roller shaft 23a. The front-side roller main body 23b is arranged rotatably around the roller shaft 23a (see FIG. 2). The right back-side roller 24 includes a roller shaft 24a and a back-side roller main body 24b arranged radially outward from the roller shaft 24a. The back-side roller main body 24b is arranged rotatably around the roller shaft 24a (see FIG. 2).

[0022] The left clamping roller pair 22 is arranged to be able to clamp a position of the conveyed web W near the left end of the web W when viewed from the upstream side in the conveying direction CD of the web W, and to be able to rotate as the web W is conveyed. The left front-side roller 25 includes a roller shaft 25a and a front-side roller body 25b arranged radially outward from the roller shaft 25a. The front-side roller body 25b is arranged rotatably around the roller shaft 25a. The left back-side roller 26 includes a roller shaft 26a and a back-side roller body 26b arranged radially outward from the roller shaft 26a. The back-side roller body 26b is arranged rotatably around the roller shaft 26a.

[0023] The right clamping roller pair 21 and the left clamping roller pair 22 are disposed at positions symmetrical to each other in the conveying direction CD of the web W.

[0024] 3 and 4, in this embodiment, the right side of the members constituting the right clamping roller pair 21 and the left side of the members constituting the left clamping roller pair 22 are outward in the width direction WD of the web W. Also, in this embodiment, the left side of the members constituting the right clamping roller pair 21 and the right side of the members constituting the left clamping roller pair 22 are inward in the width direction WD of the web W.

[0025] The right clamping roller pair 21 has roller shafts 23a and 24a arranged parallel to each other, and the left clamping roller pair 22 has roller shafts 25a and 26a arranged parallel to each other.

[0026] The right clamping roller pair 21 and the left clamping roller pair 22 are arranged so that, when viewed from a direction perpendicular to the surface of the web W (see Figure 3), the distance in the width direction WD of the web W between the rotation axis of the roller shafts 23a, 24a of the right clamping roller pair 21 and the rotation axis of the roller shafts 25a, 26a of the left clamping roller pair 22 is such that the distance downstream in the conveying direction CD of the web W is narrower than the distance upstream in the conveying direction CD (they are arranged so that the vector along which the contact surface (line) between the outer peripheral surface of the right clamping roller pair 21 and the web W moves as the web W is conveyed and the vector along which the contact surface (line) between the outer peripheral surface of the left clamping roller pair 22 and the web W moves as the web W is conveyed point to both outside sides of the web W).

[0027] That is, the right clamping roller pair 21 clamps both sides Wa, Wb of the right end of the web W in the width direction WD as viewed from the upstream conveyance side, so the rotation axes of the roller shafts 23a, 23a are disposed at a position rotated clockwise by a predetermined acute angle α with respect to the width direction WD of the web W as viewed from the normal direction to the surface Wa of the web W. The left clamping roller pair 22 clamps both sides Wa, Wb of the left end of the web W in the width direction WD as viewed from the upstream conveyance side, so the rotation axes of the roller shafts 24a, 24a are disposed at a position rotated counterclockwise by a predetermined acute angle α with respect to the width direction WD of the web W as viewed from the normal direction to the surface Wa of the web W.

[0028] As a result, the web W is subjected to tensile forces acting outward on both sides by the right clamping roller pair 21 and the left clamping roller pair 22, i.e., a component of the frictional force of the right clamping roller pair 21 and the left clamping roller pair 22 against the web W. As the web W passes through the right clamping roller pair 21 and the left clamping roller pair 22, the right clamping roller pair 21 and the left clamping roller pair 22 gradually stretch the web W in the width direction WD of the web W. This prevents the web W from sagging in the width direction WD.

[0029] Then, when the web W passes through the right clamping roller pair 21 and the left clamping roller pair 22, the right clamping roller pair 21 and the left clamping roller pair 22 enlarge the through-hole in the width direction WD of the web W.

[0030] As shown in Fig. 1, the first coating material discharge device 30 and the second coating material discharge device 40 each include a die coater 31, 41 that discharges a coating material S, and a pump 32, 42 connected to the die coater 31, 41. The die coaters 31, 41 are known devices and are provided with slot orifices (dies) 31a, 41a and discharge openings 31b, 41b, etc. The discharge openings 31b, 41b are each formed with a width smaller than the width of the web W. The die coaters 31, 41 are each positioned so that a predetermined gap length is between the discharge openings 31b, 41b and the surfaces Wa, Wb of the web W being conveyed.

[0031] The pumps 32, 42 are non-pulsating pumps such as screw pumps, and are capable of supplying the coating material S at a constant pressure and a constant flow rate. The coating material S is supplied by the pumps 32, 42 from a coating material storage section (not shown) to the slot orifices 31a, 41a of the die coaters 31, 41, respectively, where it is pressurized and discharged from the discharge ports 31b, 41b onto the surfaces Wa, Wb of the web W, respectively.

[0032] The first coating material discharge device 30 and the second coating material discharge device 40 are arranged facing each other on either side of the web W. The first coating material discharge device 30 discharges the coating material S onto the front surface Wa of the web W, which has through holes enlarged in the width direction WD of the web W by the web transport device 20. The second coating material discharge device 40 discharges the coating material S onto the back surface Wb of the web W, which has through holes enlarged in the width direction WD of the web W by the web transport device 20. The coating material S is filled into the enlarged through holes. By providing the first coating material discharge device 30 and the second coating material discharge device 40, the coating material S can be applied to both surfaces Wa and Wb of the web W while it is being transported, thereby shortening the coating time.

[0033] The drying device 50 includes a hollow box-shaped drying chamber 51 and multiple hot air generators 52. Slits 51a, 51a are provided in the center of opposing sides of the drying chamber 51 to allow the web W to pass through. The hot air generator 52 has a built-in fan and heater (both not shown) and is provided with a nozzle opening 52a for spraying the generated hot air. The multiple hot air generators 52 are arranged on the top and bottom of the drying chamber 51 so that they can spray hot air from above and below the web W to simultaneously dry the coating material S applied to both sides Wa, Wb of the web W.

[0034] This allows for a shorter drying time and a smaller drying device 50 compared to drying the coating material S on one side at a time. In addition, the web W can be floated by hot air and transported without contact, preventing damage to the coating material S applied to both sides Wa and Wb of the web W.

[0035] A conveying roller 60 is disposed between the drying device 50 and the winding device 80. The conveying roller 60 is rotatably supported by a bearing on the device body (not shown) of the web coating device 1. The conveying roller 60 is disposed so that the roller shaft 60a is parallel to the roller shafts 23a and 24a of the right clamping roller pair 21 and the roller shafts 25a and 26a of the left clamping roller pair 22, and is arranged so as to horizontally support the web W clamped by the right clamping roller pair 21 and the left clamping roller pair 22.

[0036] That is, the web W is stretched in a straight line between the right clamping roller pair 21 and the left clamping roller pair 22 and the conveying roller 60. This suppresses flapping of the web W during conveyance and allows the web W to be conveyed smoothly, thereby suppressing fluctuations in the gap length between the discharge openings 31b, 41b of the first coating material discharge device 30 and the second coating material discharge device 40 and the surfaces Wa, Wb of the web W. This makes it possible to keep the thickness of the coating material S applied to the web W constant and to achieve uniform quality of the coating material S over the entire surface of the web W.

[0037] 2. Configuration of the web transport device 20 Next, the detailed configuration of the web transport device 20 will be described with reference to Fig. 4. As shown in Fig. 4, the right clamping roller pair 21 includes a right front-side roller 23 arranged on the front surface Wa side of the web W, and a right back-side roller 24 arranged on the back surface Wb side of the web W. The left clamping roller pair 22 includes a left front-side roller 25 arranged on the front surface Wa side of the web W, and a left back-side roller 26 arranged on the back surface Wb side of the web W.

[0038] 2.1. Configuration of the Right and Left Front Rollers 23 and 25 4, the right front-side roller 23 and the left front-side roller 25 each have an inner portion 23c, 25c arranged on the inside of the width direction WD of the web W, and an outer portion 23d, 25d arranged on the outside of the width direction WD of the web W. The outer peripheral surfaces of the outer portions 23d, 25d have higher slipperiness than the outer peripheral surfaces of the inner portions 23c, 25c. The degree of slipperiness can be compared, for example, by the magnitude of the dynamic friction coefficient or the static friction coefficient.

[0039] 4, the right front-side roller 23 and the left front-side roller 25 include front-side roller bodies 23b and 25b arranged radially outward of the roller shafts 23a and 25a. The material from which the front-side roller bodies 23b and 25b are made is not particularly limited, and any suitable material can be selected, such as rubber, resin, elastomer, or metal. When the front-side roller bodies 23b and 25b are made of rubber, resin, or elastomer, the right front-side roller 23 and the left front-side roller 25 are configured to be elastically deformable in the radial direction.

[0040] The rubber constituting the front roller bodies 23b, 25b is not particularly limited and can be selected appropriately from natural rubber or synthetic rubber such as chloroprene rubber, styrene-butadiene rubber, butadiene rubber, isoprene rubber, fluororubber, acrylonitrile-butadiene rubber, butyl rubber, silicone rubber, etc. In this embodiment, for example, styrene-butadiene rubber is preferably used.

[0041] The elastomer constituting the front roller bodies 23b and 25b is not particularly limited, and any elastomer can be appropriately selected as needed, such as an ethylene-propylene copolymer elastomer, an ethylene-butene copolymer elastomer, or an ethylene-propylene-diene copolymer elastomer.

[0042] The resin constituting the front roller bodies 23b and 25b is not particularly limited, and can be selected from thermosetting resins or thermoplastic resins as appropriate. Examples of thermosetting resins include phenolic resins, epoxy resins, melamine resins, urea resins, unsaturated polyester resins, alkyd resins, silicone resins, and polyurethanes. Examples of thermoplastic resins include polyolefin resins such as polyethylene and polypropylene, polyesters such as polybutylene terephthalate and polyethylene terephthalate, and polyamides such as nylon 6 and nylon 6,6. Any resin can be selected as needed.

[0043] The metal constituting the front roller bodies 23b and 25b is not particularly limited, and any metal can be appropriately selected as needed, such as iron, iron alloy, stainless steel, nickel, nickel alloy, aluminum, aluminum alloy, etc.

[0044] By making the front-side roller bodies 23b, 25b out of rubber, resin, or elastomer, the elastic force of the front-side roller bodies 23b, 25b can firmly hold the web W. This effectively prevents the web W from shifting in the width direction WD.

[0045] As shown in Fig. 4, sliding portions 23e, 25e made of a material with higher slipperiness than the material constituting the front roller bodies 23b, 25b are disposed on the outer periphery of the front roller bodies 23b, 25b in the width direction WD. The portions where these sliding portions 23e, 25e are disposed constitute the outer portions 23d, 25d, and the exposed portions of the outer periphery of the front roller bodies 23b, 25b constitute the inner portions 23c, 25c. However, for ease of explanation, the thickness of the sliding portions 23e, 25e is exaggerated in Fig. 4. This is also true in other figures.

[0046] The sliding portions 23e, 25e may be adhesive tape made of a highly slippery material with an adhesive applied to one side of the tape. Alternatively, the sliding portions 23e, 25e may be formed by coating the outer circumferential surface of the front-side roller body 23b, 25b with a highly slippery resin. Alternatively, the sliding portions 23e, 25e may be configured to enhance slipperiness by performing a surface treatment on the outer circumferential surface of the front-side roller body 23b, 25b.

[0047] When adhesive tape is used as the sliding portion 23e, 25e, the sliding portion 23e, 25e made of adhesive tape is adhered to the outer portion of the outer peripheral surface of the front roller body 23b, 25b in the width direction WD, thereby forming the outer portion 23d, 25d. According to this embodiment, the slipperiness of the outer portion 23d, 25d can be improved by the simple technique of adhering adhesive tape. The thickness of the adhesive tape constituting the sliding portion 23e, 25e is preferably 0.1 mm or less, more preferably 0.05 mm or less. By reducing the thickness of the adhesive tape, the effect of the step between the sliding portion 23e, 25e and the inner portion 23c, 25c can be reduced. Furthermore, tearing of the web W can be suppressed.

[0048] The material for the sliding portions 23e, 25e is not particularly limited, and any resin such as fluororesin or polyolefin can be appropriately selected. Examples of fluororesin include polytetrafluoroethylene, perfluoroalkoxyalkane, and perfluoroethylenepropene copolymer. Examples of polyolefin include polyethylene and polypropylene.

[0049] Furthermore, when the sliding portions 23e, 25e are formed by coating the outer peripheral surface of the front roller body 23b, 25b with a resin having high slipperiness, examples of the resin that constitutes the sliding portions 23e, 25e include fluororesin, polyolefin resin, and epoxy resin.

[0050] Furthermore, when the sliding portions 23e, 25e are formed by performing a surface treatment on the outer circumferential surfaces of the front-side roller bodies 23b, 25b, for example, a halogenation treatment can be used as the surface treatment.

[0051] The ratio of the length dimension in the rotational axis direction of the outer portions 23d, 25d to the length dimension in the rotational axis direction of the right front-side roller 23 and the left front-side roller 25 is not particularly limited and can be selected as appropriate. The ratio of the length dimension in the rotational axis direction of the outer portions 23d, 25d to the thickness dimension in the rotational axis direction of the right front-side roller 23 and the left front-side roller 25 is, for example, preferably 80% or less, more preferably 60% or less, and even more preferably 40% or less. With the above configuration, bending of the web W can be efficiently suppressed.

[0052] 2.2. Configuration of the Right Back Roller 24 and the Left Back Roller 26 4, the right back-side roller 24 and the left back-side roller 26 include back-side roller bodies 24b, 26b arranged radially outward of the roller shafts 24a, 26a. The back-side roller bodies 24b, 26b according to this embodiment are made of metal. The metal constituting the back-side roller bodies 24b, 26b is not particularly limited, and any metal can be appropriately selected, such as iron, iron alloy, stainless steel, nickel, nickel alloy, aluminum, or aluminum alloy.

[0053] Because the back-side roller bodies 24b, 26b are made of metal, deformation of the back-side roller bodies 24b, 26b is suppressed. As a result, the outer peripheral surfaces of the back-side roller bodies 24b, 26b suppress movement of the web W in the thickness direction of the web W. As a result, flapping of the web W during transport can be suppressed.

[0054] As shown in FIG. 4, the length dimension of the right back-side roller 24 and the left back-side roller 26 in the width direction WD is set to be larger than the length dimension of the right front-side roller 23 and the left front-side roller 25 in the width direction WD.

[0055] 4, the right side surface of the right back-side roller 24 is disposed flush with the right side surface of the right front-side roller 23. Furthermore, the left side surface of the left back-side roller 26 is disposed flush with the left side surface of the left front-side roller 25. As a result, overall, the outer edges of the right back-side roller 24 and the left back-side roller 26 in the width direction WD of the web are disposed flush with the outer edges of the right front-side roller 23 and the left front-side roller 25 in the width direction WD of the web.

[0056] 4, the left side surface of the right back-side roller 24 protrudes further than the left side surface of the right front-side roller 23. Furthermore, the right side surface of the left back-side roller 26 protrudes further than the right side surface of the left front-side roller 25. As a result, the inner surfaces of the right back-side roller 24 and the left back-side roller 26 in the width direction WD of the web are generally positioned more inward than the inner surfaces of the right front-side roller 23 and the left front-side roller 25 in the width direction WD of the web.

[0057] 2.3. Web W clamping structure The clamping structure of the web W by the web transport device 20 will be described with reference to Fig. 4. As shown in Fig. 4, when the web W is clamped between the right clamping roller pair 21 and the left clamping roller pair 22, the right end of the web W in the width direction WD is clamped between the right back side roller 24 and the outer portion 23d of the right front side roller 23, and the left end of the web in the width direction WD is clamped between the left back side roller 26 and the outer portion 25d of the left front side roller 25.

[0058] The entire surface of the inner portion 23c of the right front-side roller 23 and the entire surface of the inner portion 25c of the left front-side roller 25 press the web W from the front surface Wa. The outer peripheral surface of the right back-side roller 24 faces the entire surface of the inner portion 23c of the right front-side roller 23. The outer peripheral surface of the left back-side roller 26 faces the entire surface of the inner portion 25c of the left front-side roller 25.

[0059] As shown in Fig. 4, with the web W sandwiched between the right clamping roller pair 21 and the left clamping roller pair 22, the right front-side roller 23 and the left front-side roller 25 are elastically deformed in the radial direction. However, for ease of explanation, the thickness of the web W is exaggerated in Fig. 4, and the degree of elastic deformation of the right front-side roller 23 and the left front-side roller 25 is also exaggerated in Fig. 4. This is the same in the other figures.

[0060] In Figure 4, the sliding portion 23e of the right front-side roller 23 is also elastically deformed in the radial direction of the right front-side roller 23. However, the sliding portion 23e of the right front-side roller 23 does not have to be elastically deformed. Similarly, the sliding portion 25e of the left front-side roller 25 is also elastically deformed in the radial direction of the left front-side roller 25. However, the sliding portion 25e of the left front-side roller 25 does not have to be elastically deformed.

[0061] 3. Application examples of web coating device 1 This web coating device 1 is incorporated into, for example, a system for manufacturing battery electrodes, and while conveying a metal foil as a web W, it coats the web W with a slurry electrode material as a coating material S. Here, for example, aluminum foil or the like is used as the metal foil for the positive electrode of a lithium ion capacitor, and copper foil or the like is used as the metal foil for the negative electrode. Activated carbon or the like is used as the electrode material for the positive electrode of the lithium ion capacitor, and graphite or the like is used as the electrode material for the negative electrode.

[0062] The electrodes manufactured by the web coating device 1 can be made lighter because the metal foil is stretched and through holes are formed in the metal foil, and the through holes are filled with electrode material, which can improve the volumetric energy density (the volume of active material relative to the volume of the entire battery).

[0063] Furthermore, although the web coating device 1 is a device that applies the coating material S to both sides Wa and Wb of the web W, it is also possible to make it a device that applies the coating material S to only one side Wa or Wb of the web W.

[0064] Furthermore, although the web coating device 1 is described as being incorporated into a system for manufacturing electrodes for lithium ion capacitors, it can also be incorporated into a system for manufacturing electrodes for lithium ion secondary batteries, etc. In this case, the step of forming the through holes is omitted. Furthermore, the coating of the coating material S on the front surface and the coating of the back surface may be performed in separate steps, or may be performed in the same step. Note that electrodes for lithium ion capacitors may also be manufactured using a web W that does not have through holes. In this case, the coating of the coating material S on the front surface and the coating of the back surface may be performed in separate steps, or may be performed in the same step.

[0065] 4. Effects of this form Next, the effects of this embodiment will be described. Fig. 5 shows a state in which the web W is positioned to the right of the width direction WD of the web W compared to Fig. 4. Even in this state, in this embodiment, with the web W sandwiched between the right clamping roller pair 21 and the left clamping roller pair 22, the right end of the web W in the width direction WD is sandwiched between the right back-side roller 24 and the outer portion 23d of the right front-side roller 23, and the left end of the web W in the width direction WD is sandwiched between the left back-side roller 26 and the outer portion 25d of the left front-side roller 25. Furthermore, the entire surface of the inner portion 23c of the right front-side roller 23 and the entire surface of the inner portion 25c of the left front-side roller 25 press the web W from the front surface Wa. The outer peripheral surface of the right back-side roller 24 faces the entire surface of the inner portion 23c of the right front-side roller 23. The outer peripheral surface of the left back-side roller 26 faces the entire surface of the inner portion 25 c of the left front-side roller 25 .

[0066] 4 and 5, according to this embodiment, even when the web W moves in the width direction WD, the contact area between the web and the inner portion 23c of the right front-side roller 23 and the contact area between the web and the inner portion 25c of the left front-side roller 25 can be prevented from changing. This prevents a difference from occurring between the tension applied to the web W by the right clamping roller pair 21 and the tension applied to the web W by the left clamping roller pair 22. As a result, the uniformity of the tension applied to the web W can be improved.

[0067] Furthermore, according to this embodiment, when the web W is clamped between the right clamping roller pair 21 and the left clamping roller pair 22, the right end of the web W in the width direction WD is clamped between the right back side roller 24 and the outer portion 23d of the right front side roller 23, and the left end of the web W in the width direction WD is clamped between the left back side roller 26 and the outer portion 25d of the left front side roller 25. Therefore, it is possible to prevent the left and right ends of the web W in the width direction WD from bending due to the pressing force applied from the right clamping roller pair 21 or the left clamping roller pair 22.

[0068] Furthermore, in the portion of the web W that is sandwiched between the right back-side roller 24 and the outer portion 23d of the right front-side roller 23, the outer portion 23d of the right front-side roller 23 has high slipperiness, so the pressing force from the outer portion 23d of the right front-side roller 23 is small. Similarly, in the portion of the web W that is sandwiched between the left back-side roller 26 and the outer portion 25d of the left front-side roller 25, the pressing force from the outer portion 25d of the left front-side roller 25 is small. This makes it possible to prevent a difference from occurring between the tension applied to the web W by the right clamping roller pair 21 and the tension applied to the web W by the left clamping roller pair 22, thereby improving the uniformity of the tension applied to the web W. Furthermore, the web W is pressed by the inner portion 23c of the right front side roller 23 and the inner portion 25c of the left front side roller 25 while maintaining a constant contact area of ​​the web W, and the pressing force can be reduced by the outer portion 23d of the right front side roller 23 and the outer portion 25d of the left front side roller 25. This prevents the web W from bending while being pulled by one of the rollers, making the conveyance unstable, and makes it possible to prevent damage such as tearing of the web W.

[0069] According to this embodiment, the inner edges of the right back-side roller 24 and the left back-side roller 26 in the width direction WD of the web W are positioned more inward than the inner edges of the right front-side roller 23 and the left front-side roller 25 in the width direction WD of the web W. This allows the web W to be sandwiched between the inner portion 23c of the right front-side roller 23 and the right back-side roller 24, and also between the inner portion 25c of the left front-side roller 25 and the left back-side roller 26.

[0070] (Embodiment 2) Next, a web transport device 20a according to a second embodiment will be described with reference to Figures 6 and 7. As shown in Figure 6, in this embodiment, the length dimension of the right front-side roller 23 in the width direction WD of the web W and the length dimension of the right back-side roller 24 in the width direction WD of the web W are set to be substantially the same. "Substantially the same" includes cases where they are the same, and also includes cases where they can be recognized as being substantially the same even if they are not the same.

[0071] In this embodiment, the inner edges of the right back-side roller 24 and the left back-side roller 26 in the width direction WD of the web are disposed substantially flush with the inner edges of the right front-side roller 23 and the left front-side roller 25 in the width direction WD of the web. "Substantially flush" includes cases where the edges are flush, and also includes cases where the edges can be recognized as being substantially flush even when they are not flush.

[0072] Note that, among the symbols used in the second and subsequent embodiments, the same symbols as those used in the previous embodiments represent the same components, etc. as those in the previous embodiments, unless otherwise specified.

[0073] The effects of this embodiment will be described. Fig. 7 shows the configuration of a web transport device 20z according to a comparative example. In the web transport device 20z, the inner edges of the right front-side roller 23 and the left front-side roller 25 in the web width direction WD protrude inward in the width direction WD of the web W beyond the inner edges of the right back-side roller 24 and the left back-side roller 26 in the web width direction WD. In this case, the portions of the inner portions 23c, 25c of the right front-side roller 23 and the left front-side roller 25 that protrude inward in the width direction WD of the web W do not face the right back-side roller 24 and the left back-side roller 26, and therefore are not subjected to pressing forces from the right back-side roller 24 and the left back-side roller 26 and are not elastically deformed. As a result, the portions of the inner portions 23c, 25c of the right front-side roller 23 and the left front-side roller 25 that protrude inward in the width direction WD of the web W press the web W against the back surface Wb of the web W. As a result, the web W receives a shear force from the portions of the inner portions 23c, 25c of the right front-side roller 23 and the left front-side roller 25 that protrude inward in the width direction WD of the web W. As a result, there is a risk that the web W will tear.

[0074] 6, the inner edges of the right back-side roller 24 and the left back-side roller 26 in the width direction WD of the web are disposed substantially flush with the inner edges of the right front-side roller 23 and the left front-side roller 25 in the width direction WD of the web, thereby preventing shear force from being applied to the web W. As a result, tearing of the web W can be prevented.

[0075] (Embodiment 3) Next, a web transport device 20b according to a third embodiment will be described with reference to Fig. 8. In this embodiment, of the front-side roller bodies 23b, 25b of the right front-side roller 23 and the left front-side roller 25, the outer regions in the width direction WD of the web W are formed as small-diameter portions 23f, 25f that are formed with a smaller diameter than the inner regions. Sliding portions 23e, 25e made of a material that is more slippery than the material constituting the front-side roller bodies 23b, 25b are fitted onto the outside of the small-diameter portions 23f, 25f.

[0076] The sliding portions 23e, 25e are formed in a ring shape. The inner diameter of the sliding portions 23e, 25e is set to be the same as or slightly smaller than the outer diameter of the small diameter portions 23f, 25f. As a result, the sliding portions 23e, 25e are fixed to the front roller bodies 23b, 25b by being fitted onto the small diameter portions 23f, 25f of the front roller bodies 23b, 25b. However, the sliding portions 23e, 25e and the small diameter portions 23f, 25f may also be fixed by adhesive, thermal welding, or the like.

[0077] With the sliding portions 23e, 25e fitted onto the small-diameter portions 23f, 25f of the front-side roller bodies 23b, 25b, the outer peripheral surfaces of the sliding portions 23e, 25e are formed substantially flush with the outer peripheral surfaces of the inner portions 23c, 25c of the front-side roller bodies 23b, 25b. This allows the outer peripheral surfaces of the right front-side roller 23 and the left front-side roller 25 to be formed smooth, thereby preventing damage to the surface of the web W.

[0078] However, when the web W is clamped between the right clamping roller pair 21 and the left clamping roller pair 22, the small diameter portions 23f, 25f may be elastically deformed, the sliding portions 23e, 25e may be elastically deformed, or both the small diameter portions 23f, 25f and the sliding portions 23e, 25e may be elastically deformed.

[0079] (Embodiment 4) Next, a web transport device 20c according to a fourth embodiment will be described with reference to Fig. 9. As shown in Fig. 9, in this embodiment, outer portions 25d of the right front-side roller 23 and the left front-side roller 25 and inner portions 23c, 25c of the right front-side roller 23 and the left front-side roller 25 are formed of different materials.

[0080] The inner portions 23c, 25c of the right front-side roller 23 and the left front-side roller 25 are made of rubber, resin, or elastomer. The material constituting the inner portions 23c, 25c of the right front-side roller 23 and the left front-side roller 25 is the same as the material constituting the front-side roller bodies 23b, 25b according to the first embodiment, so a redundant description will be omitted.

[0081] The outer portions 25d of the right front-side roller 23 and the left front-side roller 25 are formed of a material that is more slippery than the inner portions 23c, 25c of the right front-side roller 23 and the left front-side roller 25. The material that constitutes the outer portions 25d of the right front-side roller 23 and the left front-side roller 25 is the same as the material that constitutes the sliding portions 23e, 25e in embodiment 1, so a redundant description will be omitted.

[0082] The inner portion 23c of the right front-side roller 23 and the outer portion 23d of the right front-side roller 23 may or may not be fixed to each other.

[0083] When the inner portion 23c of the right front-side roller 23 and the outer portion 23d of the right front-side roller 23 are fixed to each other, they can be fixed by any method such as adhesive, heat welding, screw fastening, or fitting.

[0084] When the inner portion 23c of the right front-side roller 23 and the outer portion 23d of the right front-side roller 23 are not fixed, the inner portion 23c of the right front-side roller 23 and the outer portion 23d of the right front-side roller 23 can be configured to be independently rotatable about a rotation axis. This reduces the force with which the outer portion 23d of the right front-side roller 23 clamps the web W. This prevents the web W from shifting in the width direction WD.

[0085] Furthermore, the inner portion 25c of the left front-side roller 25 and the outer portion 25d of the left front-side roller 25 are similar to the inner portion 23c of the right front-side roller 23 and the outer portion 23d of the right front-side roller 23, so redundant explanations will be omitted.

[0086] (Embodiment 5) Next, a web transport device 20d according to a fifth embodiment will be described with reference to FIG. 10. As shown in FIG. 10, in this embodiment, the back-side roller bodies 24b, 26b of the right back-side roller 24 and the left back-side roller 26 are made of rubber, resin, or elastomer. This allows the back-side roller bodies 24b, 26b to be elastically deformable. As a result, when the web W is sandwiched between the right clamping roller pair 21 and the left clamping roller pair 22, the right front-side roller 23, the right back-side roller 24, the left front-side roller 23, and the left back-side roller 26 elastically deform. This prevents shear force from being applied to the web W, thereby preventing the web W from breaking.

[0087] The present invention is not limited to the above-described embodiments, and can be applied to various embodiments within the scope of the present invention. [Explanation of symbols]

[0088] 1: web coating device, 20, 20a, 20b, 20c, 20d: web transport device, 21: right clamping roller pair, 22: left clamping roller pair, 23: right front side roller, 23a: roller shaft, 23b: front side roller body, 23c: inner part, 23d: outer part, 23e: sliding part, 24: right back side roller, 24a: roller shaft, 24b: back side roller body, 25: left front side roller, 25a: roller shaft, 25b: front side roller body, 25c: inner part, 25d: outer part, 25e: sliding part, 26: left back side roller, 26a: roller shaft, 26b: back side roller body, 30: first coating material discharge device, 40: second coating material discharge device, CD: transport direction, S: coating material, W: web, Wa: front side, Wb: back side, α: angle

Claims

1. A web transport device that transports a web having a front surface and a back surface, a right clamping roller pair arranged to be able to clamp a position near the right end of the web as viewed from the upstream side in the conveying direction and to be able to rotate as the web is conveyed; a left clamping roller pair arranged symmetrically to the right clamping roller pair in the web conveying direction, capable of clamping a position near the left end of the web as viewed from the upstream side in the web conveying direction, and rotatable as the web is conveyed; the rotation axis of the right clamping roller pair is disposed at a position rotated clockwise at a predetermined acute angle with respect to the width direction of the web when viewed from the normal direction of the surface of the web, the other of the rotation shafts of the left clamping roller pair is disposed at a position rotated counterclockwise at a predetermined acute angle with respect to the width direction of the web when viewed from the normal direction to the surface of the web, The right clamping roller pair is a right front roller disposed on the front surface side of the web; a right back roller disposed on the back side of the web, The left clamping roller pair is a left front roller disposed on the back side of the web; a left back roller disposed on the back side of the web, The right front-side roller and the left front-side roller are each an inner portion disposed on the inner side in the width direction of the web; an outer portion disposed on the outer side of the web in the width direction and having an outer peripheral surface that is more slippery than the inner portion; With the web sandwiched between the right sandwiching roller pair and the left sandwiching roller pair, a right end portion of the web in the width direction is sandwiched between the outer portion of the right front-side roller and the right back-side roller, the left end portion of the web in the width direction is sandwiched between the outer portion of the left front-side roller and the left back-side roller, the entire surfaces of the inner portions of the right and left front-side rollers press against the web; a web conveying device in which the right back-side roller faces the entire surface of the inner portion of the right front-side roller, and the left back-side roller faces the entire surface of the inner portion of the left front-side roller;

2. 2. The web conveying device according to claim 1, wherein the inner edges of the right back-side roller and the left back-side roller in the width direction of the web are positioned flush with or inside the inner edges of the right front-side roller and the left front-side roller in the width direction of the web.

3. the right back roller and the left back roller are made of metal, 2. The web conveying device according to claim 1, wherein the inner edges of the right back-side roller and the left back-side roller in the width direction of the web are arranged flush with the inner edges of the right front-side roller and the left front-side roller in the width direction of the web.

4. The web transport device according to claim 1 , wherein the inner portion is made of rubber, resin, or elastomer.

5. The web transport device according to claim 4 , wherein outer edges of the right back-side roller and the left back-side roller in the width direction of the web are arranged flush with outer edges of the right front-side roller and the left front-side roller.

6. The right front-side roller and the left front-side roller each include a roller shaft and a front-side roller body disposed radially outward of the roller shaft; 2. The web transport device according to claim 1, wherein the outer portion of the front roller body is formed by covering an outer portion of the front roller body in the width direction of the web with a material that is more slippery than the material constituting the front roller body.

7. The web transport device according to claim 1 , wherein the outer portions of the right and left front-side rollers and the inner portions of the right and left front-side rollers are formed of different materials.

8. A web coating device that applies a coating material to at least one of the front and back surfaces of a web being conveyed, A web transport device according to any one of claims 1 to 7; a coating material discharge device that applies the coating material to at least one of the front surface and the back surface of the web.

Images