JP2015218008A - Coating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating system in which meandering control can be stably conducted even when oil or the like is adhered to a surface of a base material to be coated.SOLUTION: In a coating system 1, a base material 50 to be conveyed by a roll-to-roll system is coated. A drying device 8 arranged on downstream sides of coating devices 5, 6, and a meandering control device are included. The meandering control device includes: a holding part 7 having rotatable rollers 21, 22 which hold an edge part 50a of the base material 50; and an angle control part 9a which controls inclination angles of the rollers 21, 22 in rotation directions. An adhered oil removing device 30 for removing oil adhered to surfaces of the rollers 21, 22 is attached to the holding part 7.

Description

  The present invention relates to a coating system for continuously coating a sheet-like base material while being conveyed by a roll-to-roll method in the manufacturing process of an electrode material or the like, and particularly relates to a meandering control technique for the base material.

  A substrate meandering control technique is disclosed in, for example, Patent Document 1. In order to prevent wrinkling of the base material, a pair of base material clamping members positioned opposite to the left and right sides of the base material are provided in the transport device in a state in which a plurality are arranged along the transport direction. Yes.

  These base material clamping members are composed of a pressing roller and a flat plate, or a combination of two pressing rollers, and sandwich both edge portions in the width direction of the base material while being inclined with respect to the transport direction of the base material. doing.

  Then, the position of both edges of the base material is detected by a sensor, and the meandering correction of the base material is performed by changing the inclination angle of the pressing roller based on the detection result.

  Moreover, the manufacturing apparatus of the electrode for batteries which coats, washing | cleaning is disclosed regarding this invention (patent document 2).

  The manufacturing apparatus of patent document 2 is an apparatus which coats an active material to current collection foil. Since the rolling oil adheres to the surface of the current collector foil, the wettability is poor, and when the active material is applied as it is, the width of the coated active material varies.

  Therefore, the manufacturing apparatus includes a cleaning unit that performs cleaning with a rotating brush containing a cleaning agent such as acetone in contact with the surface of the base material on the upstream side of the coating unit that coats the active material. . The cleaning parts are respectively arranged on both sides of the base material, and the base material is cleaned by these cleaning parts.

JP 2001-316006 A JP 2012-204134 A

  In the coating system that controls the meandering of the base material by sandwiching both edges of the base material with rollers and controlling the inclination angle of the running direction of these rollers, when oil or the like adheres to the surface of the base material, The roller may slip and the meander control may become unstable.

  Therefore, an object of the present invention is to provide a coating system capable of stably controlling meandering even when oil is adhered to the surface of a substrate to be coated.

  The disclosed coating system coats a substrate transported in a roll-to-roll manner. This coating system controls a coating device that applies a coating liquid to the substrate, a drying device that is disposed downstream of the coating device, and dries the coating solution, and meandering the substrate. A meandering control device.

  The meandering control device is arranged on the upstream side of the drying device so as to face both sides of the substrate to be conveyed, and each has a rotatable roller that sandwiches the surface of the edge of the substrate. And an angle control unit that controls an inclination angle of the rotation direction of the roller with respect to the conveyance direction of the base material in each of the clamping units. And the adhesion oil removal apparatus which removes the oil adhering to the surface of the said roller is attached to the said clamping part.

  That is, according to this coating system, in order to control the meandering of the base material conveyed by the roll-to-roll method, the rotatable roller that sandwiches the edge of the base material and controls the tilt angle in the rotation direction is provided. An attached oil removing device for removing oil adhering to the surface of the roller is attached to the holding part.

  Therefore, even if the oil adhering to the surface of the base material is transferred to the surface of the roller, it can be removed by the adhering oil removing device, so that the roller can be prevented from slipping and the meandering control can be performed stably.

  For example, the attached oil removing device may be operated by engaging with the roller only when an instruction is received.

  By doing so, it is not necessary for the adhered oil removing device to always be associated with the clamping portion, and therefore, running costs can be suppressed.

  Specifically, the adhered oil removing device includes a liquid supply unit that supplies a cleaning liquid to a surface of the roller that is directed to a contact position with an edge surface of the base material, the contact position, and the liquid supply unit. The scraping plate that scrapes the cleaning liquid with the tip edge coming into contact with the surface of the roller and the cleaning liquid scraped off by the scraping plate leaks to the contact position. And a liquid recovery section for preventing the above.

  In this way, oil attached to the surface of the roller can be effectively removed.

  When each of the sandwiching portions is installed in a lateral conveyance region where the substrate is conveyed in a substantially horizontal direction, the roller disposed above the substrate is made of an elastic material. It is good to be.

  If it does so, the clearance gap between a roller and a liquid collection | recovery part can be closed with high precision using the elasticity of a roller. Therefore, the liquid recovery unit can be safely placed on the upper side of the base material.

  According to the coating system of the present invention, even if oil or the like adheres to the surface of the substrate to be coated, the meandering control can be performed stably, so that highly accurate coating can be realized.

It is the schematic which shows the coating system of this embodiment. It is a schematic sectional drawing which shows the structure of the base material by which the coating process was carried out with the coating system. It is a schematic perspective view which shows the installation part of a control roller pair (clamping part). FIG. 4 is a schematic plan view of FIG. 3 viewed from above. It is a schematic sectional drawing which shows the structure of an adhesion oil removal apparatus.

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

  In FIG. 1, the coating system 1 of this embodiment is shown. This coating system 1 is a double-sided coating system that transports a long base material 50 in a roll-to-roll manner, and a series of processes for applying and drying a coating liquid on both surfaces of the base material 50 are continuous. It is configured to be able to do.

  Here, the “roll-to-roll method” is a method in which the base material 50 wound in a roll shape is unwound and conveyed intermittently or continuously, and the base material 50 is again wound into a roll shape. . In the conveying process, coating is applied to the surface of the base material 50.

(Base material)
FIG. 2 shows an electrode material of a battery as an example of the base material 50 ′ that has been coated by the coating system 1. The base material 50 before coating is composed of a sheet material 51 (current collector foil) made of a strip-shaped metal thin film and an active material layer (active material layer 52) such as graphite formed on each of both surfaces thereof. Has been. Depending on the selection of the active material to be used, a negative electrode or a positive electrode material is formed.

  The sheet material 51 is formed by rolling copper (rolled material). Since rolling oil is applied to the surface during rolling, the rolling oil is usually attached to the surface of the sheet material 51.

  The width of each active material layer 52 is formed to be smaller than the width of the sheet material 51, and both the base material 50 before coating and the base material 50 ′ after coating, It has an edge portion (exposed edge portion 50a) where the sheet material 51 is exposed from the active material layer 52 with the same width.

  Such a substrate 50 before coating is set in the coating system 1 in a state of being wound around a core material in a roll shape. In the coating system 1, a coating liquid containing a flame retardant is applied to both surfaces of the substrate 50. Thereby, as shown in FIG. 2, the heat-resistant protective layer 53 which covers the active material layer 52 is formed in each of both surfaces of base material 50 'after coating.

(Coating system)
The coating system 1 includes an unwinding device 2, a winding device 3, a plurality of guide rollers 4a, 4b, 4c, a first coating device 5, a second coating device 6, a control roller pair 7 (clamping unit), and a floating It comprises a dryer 8 (drying device), a controller 9 and the like.

  The controller 9 includes various software such as a control program and a computer in which these software is installed, and comprehensively controls the entire coating system 1.

  The unwinding device 2 includes a support base 2a for unwinding the roll-shaped base material 50 and an upstream roller pair 2b for feeding the base material 50 at a predetermined speed. The winding device 3 includes a support base 3a for winding the substrate 50 'in a roll shape, and a downstream roller pair 3b for drawing the substrate 50'. The unwinding device 2 also has a function of controlling the transport state of the base material 50 by displacing the transported base material 50 in the width direction.

  Each of the upstream and downstream roller pairs 2b and 3b is composed of two feed rollers that sandwich the base material 50 (50 ') and control its conveying speed. The upstream roller pair 2b is controlled so as to interlock with the downstream roller pair 3b.

  A coating zone is provided on the downstream side of the upstream roller pair 2b. In this coating zone, a first guide roller 4a, a second guide roller 4b, a first coating device 5, and a second coating device 6 are installed. Reference numeral 10 is a sensor that detects a conveyance state of the substrate 50 such as a positional deviation of the substrate 50 in the coating zone.

  Specifically, the coating zone includes an upward conveyance area UA that conveys the base material 50 in a substantially vertical direction (vertical direction) upward, and a downstream side of the upward conveyance area UA, and the base material in a substantially horizontal direction. A horizontal conveyance area HA for conveying 50 is set.

  The first guide roller 4a and the second guide roller 4b are disposed in the upward conveying area UA at a distance from each other in contact with one surface (second coating surface) of the substrate 50. In the upward conveyance area UA, the base material 50 is guided in the vertical direction upward in a tension state in which tension is applied by contacting the first guide roller 4a and the second guide roller 4b.

  Then, by being wound around the second guide roller 4b, the transport direction of the base material 50 is changed in a substantially horizontal direction while being in a tension state, and is guided to the lateral transport area HA.

  Each of the first coating device 5 and the second coating device 6 is a gravure kiss coating type coating device.

  The first coating device 5 is installed in the upward conveyance area UA so as to be in contact with the other surface (first coating surface) of the base material 50 traveling between the first guide roller 4a and the second guide roller 4b. The coating liquid is applied to the first coating surface of the substrate 50.

  The 2nd coating device 6 is installed in the horizontal conveyance area | region HA so that the 2nd coating surface of the base material 50 extended in a substantially horizontal direction may be contacted from the downward direction, and coating liquid is applied to the 2nd coating surface of the base material 50. Apply.

  In order to dry the applied coating liquid, a floating dryer 8 is disposed on the downstream side of the coating zone.

  The floating dryer 8 is a dryer that dries while transporting the base material 50 coated with both sides of the coating liquid. Inside the floating dryer 8, blowers 8 a that blow dry air toward the base material 50 are installed alternately in the vertical direction along the transport direction. The floating dryer 8 dries the substrate 50 received from the carry-in port 8b while being conveyed in a floating state, and delivers the substrate 50 'from the carry-out port 8c.

  A third guide roller 4 c is installed outside the carry-out port 8 c on the downstream side of the floating dryer 8. The base material 50 ′ is supported by the third guide roller 4 c and guided to the winding device 3.

  A control roller pair 7 is installed in the lateral conveyance area HA outside the carry-in port 8 b on the upstream side of the floating dryer 8.

  The control roller pair 7 has a function of controlling the transport state of the base material 50 by displacing the transported base material 50 in the width direction. With this function, in this coating system 1, the flutter of the base material 50 is suppressed inside the floating dryer 8, the drying is stabilized, and in cooperation with the unwinding device 2, The meandering of the material 50 is suppressed, and the coating is stabilized.

  As shown in FIG. 3, the control roller pair 7 is composed of two located on the left and right sides of the base material 50, and is disposed at a position facing the base material 50. Each control roller pair 7 includes a control roller 21 and a support roller 22. These are juxtaposed up and down and supported by a support rod 23 extending in the vertical direction via a support member 24. The control roller 21 and the support roller 22 are rotatable about a rotation axis R extending in parallel with each other in a substantially horizontal direction.

  The control roller 21 disposed above the base member 50 is made of synthetic resin or rubber, and is made of a material having elasticity and excellent wear resistance and oil resistance, such as NBR. The support roller 22 is made of metal such as aluminum. The control roller 21 is biased toward the support roller 22 by an elastic force, and is set so that a constant pressing force acts between the control roller 21 and the support roller 22.

  When the substrate 50 is transported, both the left and right exposed end portions 50a are sandwiched and supported by the left and right control roller pairs 7.

  As shown in FIG. 1, the left and right support rods 23 are rotatably supported by a rotation device 25, and the left and right control roller pairs 7 are posture-controlled via the support rods 23. Yes. Specifically, the controller 9 includes an angle control unit 9a that controls the rotation of the left and right support rods 23 based on the detection value of the sensor 10, and the angle control unit 9a controls each rotation device 25. By doing so, each support rod 23 rotates.

  Thereby, the postures of the left and right control roller pairs 7 at the time of transporting the base material 50 are always controlled so that the respective rotation directions are inclined with respect to the transport direction of the base material 50 and are directed in specific directions. . That is, the control roller pair 7 constitutes a meandering control device together with the angle control unit 9a.

  Usually, as shown in FIG. 4, the pair of left and right control rollers 7 are inclined with respect to the conveyance direction of the base material 50 at predetermined inclination angles θR and θL, and the interval on the downstream side is wider than that on the upstream side. In this way, the posture is controlled so as to open in the shape of a letter C in the transport direction.

  When the base material 50 is conveyed, the inclination angles θR and θL of the control roller pairs 7 are always finely adjusted, and the base material 50 is displaced in the width direction. As a result, meandering and fluttering of the substrate 50 to be conveyed are suppressed, and high-quality electrode material can be manufactured.

  However, rolling oil adheres to the surface of the exposed end portion 50a sandwiched between the control roller pair 7. For this reason, the rolling oil is transferred to the control roller 21 or the support roller 22, and these 21 and 22 may slip to make the meander control unstable.

  Therefore, in this coating system 1, an attached oil removing device 30 that removes the rolling oil attached to the control roller 21 or the support roller 22 is attached to each control roller pair 7 so that the meandering control can be stably performed. Yes.

(Adhesive oil removal device)
The adhered oil removing device 30 of the present embodiment is composed of two adhered oil removing units 31 and 31 as shown by phantom lines in FIG. 3, and these are symmetrical with respect to the left and right control roller pairs 7. It is installed in the shape.

  As shown in FIG. 5, each adhered oil removing unit 31 has an upper unit 31 a installed on the control roller 21 and a lower unit 31 b installed on the support roller 22.

  Each of the upper unit 31 a and the lower unit 31 b includes a liquid supply unit 33, a scraping plate 34, a liquid recovery unit 35, and the like, and is arranged symmetrically with respect to the base material 50.

  The liquid supply unit 33 supplies the cleaning liquid to the surfaces of the rollers 21 and 22 that are directed to a position (contact position) in contact with the surface of the exposed end 50a. The liquid supply unit 33 of the upper unit 31 a sprays the cleaning liquid downward from above the control roller 21 toward the surface of the control roller 21, and the liquid supply unit 33 of the lower unit 31 b supports the support roller from below the support roller 22. The cleaning liquid is sprayed upward toward the surface 22.

  As long as the rolling oil can be removed from the base material 50, the cleaning liquid can be appropriately selected and used. For example, there are cleaning agents mainly composed of organic solvents such as alcohol and acetone, and cleaning agents combining organic solvents and water.

  The cleaning liquid is preferably sprayed (sprayed) in the form of a mist. By doing so, the cleaning liquid can be more uniformly adhered to the surfaces of the rollers 21 and 22, and even if the amount of adhesion is increased, the dripping of the cleaning liquid can be prevented.

  The scraping plate 34 is made of a plate-like member formed using a synthetic resin excellent in oil resistance and friction resistance such as polyester. The scraping plate 34 scrapes the cleaning liquid adhering to the surfaces of the rollers 21 and 22 at a position between the contact position and the position (liquid supply position) at which the cleaning liquid is supplied to the surface of the roller by the liquid supply unit 33. It is configured as follows.

  Specifically, the scraping plate 34 has a sharp edge 34a that is longer than the width of the rollers 21 and 22 on one side edge thereof. The blade-like portion 34a contacts the surfaces of the rotating rollers 21 and 22 in a transverse state, whereby the cleaning liquid attached to the surfaces of the rollers 21 and 22 is scraped off.

  The scraping plate 34 can be displaced in a substantially horizontal direction. The scraping plate 34 is in a use position where the blade-like portion 34 a is in contact with the surfaces of the rollers 21, 22, and a standby state where the blade-like portion 34 a is separated from the surfaces of the rollers 21, 22. Displace to position.

  The liquid recovery unit 35 is formed of a container-like member having an opening 35 a facing the rollers 21 and 22 on the side, and is configured integrally with the scraping plate 34. The liquid recovery unit 35 is disposed in the vicinity of the rollers 21 and 22 and is configured so that the inside thereof is substantially sealed.

  The liquid recovery unit 35 recovers the cleaning liquid scraped off by the scraping plate 34 and prevents the cleaning liquid from leaking to the contact position. The cleaning liquid recovered by the liquid recovery unit 35 is discharged through the discharge port 35b.

  In this coating system 1, the control roller 21 having elasticity is arranged on the upper side of the base material 50, so that the clearance between the control roller 21 and the liquid recovery unit 35 can be easily made using the elasticity. The structure can be closed with high accuracy. Accordingly, since the leakage of the cleaning liquid can be reliably prevented, the liquid recovery unit 35 can be safely disposed on the upper side of the substrate 50.

  Each adhered oil removing device 30 of the present embodiment is controlled so as to engage with each of the rollers 21 and 22 and operate only when receiving an instruction from the controller 9.

  Specifically, as shown in FIG. 1, the controller 9 is provided with a roller cleaning control unit 9 b that controls the operation of the attached oil removing device 30, and the roller cleaning control unit 9 b removes the liquid from the liquid supply unit 33. The operations of spraying the cleaning liquid and displacing the scraping plate 34 and the liquid recovery unit 35 are controlled.

  For example, when the controller 9 receives an operation instruction from an operator or when the operation timing comes based on a program set in the controller 9 in advance, the roller cleaning control unit 9b operates each adhered oil removing device 30. Let

  When each of the attached oil removing devices 30 is operated, the scraping plate 34 and the liquid recovery unit 35 are displaced from the standby position to the use position, and the cleaning liquid from the liquid supply unit 33 is jetted. By doing so, the rolling oil comes into contact with the cleaning liquid and floats from the surfaces of the rollers 21 and 22.

  The rolling oil that has been easily removed in this manner is scraped off by the scraping plate 34 and recovered by the liquid recovery unit 35, so that the rolling oil adhering to the surfaces of the rollers 21 and 22 can be effectively removed. it can.

  When each adhered oil removing device 30 is activated for a predetermined time, the ejection of the cleaning liquid is stopped, and the scraping plate 34 and the liquid recovery unit 35 are returned from the use position to the original standby position.

  Thus, normally, if each adhered oil removing device 30 is independent from each control roller pair 7 and operates only when instructed, the durability of the rollers 21 and 22 can be improved and the running can be improved. Costs can be reduced.

(Other)
The coating system concerning this invention is not limited to embodiment mentioned above, The other various structure is included.

  For example, a plate-like support plate or a block-like support block may be used instead of the support roller constituting the clamping unit. The attached oil removing device is not necessarily attached to all control rollers and support rollers.

  Furthermore, the form of the adhered oil removing device described above is an example. For example, a pressing member made of sponge or the like impregnated with a cleaning liquid may be controlled and pressed against the surface of each roller as necessary.

  You may provide the drying part which injects dry air on the surface of a roller between the position (liquid scraping position) where the scraping board scrapes off the cleaning liquid adhering to the surface of the roller, and the contact position. Then, the drying of the roller surface can be further promoted.

DESCRIPTION OF SYMBOLS 1 Coating system 5 1st coating apparatus 6 2nd coating apparatus 7 Control roller pair 7 (clamping part)
8 Floating dryer (drying equipment)
DESCRIPTION OF SYMBOLS 9 Controller 9a Angle control part 9b Roller washing | cleaning control part 21 Control roller 22 Support roller 30 Adhesive oil removal apparatus 50 Base material 50a Exposed edge part

Claims (4)

A coating system for coating a substrate conveyed by a roll-to-roll method,
A coating apparatus for applying a coating liquid to the substrate;
A drying device disposed downstream of the coating device and drying the coating solution;
A meander control device for controlling meandering of the substrate;
With
The meandering control device
Two sandwiching portions that are arranged on opposite sides of the substrate to be conveyed on the upstream side of the drying device, each having a rotatable roller that sandwiches the surface of the edge of the substrate, and ,
An angle control unit that controls an inclination angle of a rotation direction of the roller with respect to a conveyance direction of the base material in each of the clamping units;
Have
A coating system in which an attached oil removing device for removing oil adhering to the surface of the roller is attached to the holding portion. In the coating system according to claim 1,
The adhered oil removing device is a coating system that operates by engaging with the roller only when an instruction is received. In the coating system according to claim 1 or 2,
The adhered oil removing device is
A liquid supply unit for supplying a cleaning liquid to the surface of the roller toward the contact position with the surface of the edge of the substrate;
A scraping plate that scrapes the cleaning liquid between the contact position and a liquid supply position where the cleaning liquid is supplied by the liquid supply unit, with a tip edge contacting the surface of the roller;
A liquid recovery unit that prevents the cleaning liquid scraped off by the scraping plate from leaking to the contact position;
Having a coating system. In the coating system according to claim 3,
Each of the sandwiching portions is installed in a lateral conveyance region where the base material is conveyed in a substantially horizontal direction,
The coating system which the said roller arrange | positioned above a base material consists of a raw material which has elasticity.

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