JP2013107053A - Apparatus for coating both sides - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for coating both sides that can stably guide a running web.SOLUTION: The apparatus for coating is configured such that an upper and lower pair of upper die 12 and a lower die 15 is arranged in a conveyance path of the web W that horizontally conveys and a guide member 16 is arranged on an upstream side of the lower die 14. The guide member 16 includes an air blow-out part 42 made of a porous material.

Description

  The present invention relates to a double-side coating apparatus for coating a coating liquid on both sides of a long web.

  With the recent spread of lithium-ion batteries and polymer batteries, the number of processes for applying an electrode agent (coating solution) to both surfaces of a web such as a metal foil and a punching foil has increased in the manufacturing process of these batteries. For this coating, a die coating method using a die is often used.

  Conventionally, in the first line, the web is unwound from an unwinding device, coated with a coating solution on one surface of the web with a die, dried with a heat treatment device, dried, and then wound with a winding device. . After that, the web wound up by the winding device in the second line is installed again in the unwinding device, and the coating liquid is applied again by the die to the other surface of the previously coated web, and the heat treatment device It is a general manufacturing process that is dried and wound on a winding device.

  However, in order to increase productivity, a double-side coating apparatus that applies a coating solution to both sides of a web in one line has been proposed.

  For example, Patent Document 1 proposes a double-side coating apparatus that simultaneously coats both surfaces of a web with a pair of upper and lower dies provided on the upstream side of the heat treatment apparatus.

  According to Patent Document 2, a guide part is provided at a predetermined position close to the die slit tip of the die, and the die tip and the surface of the web are brought into contact with and sliding with the front surface of the running web. There has been proposed a double-side coating apparatus that maintains the gap between the two at a constant distance.

  Patent Document 3 proposes a double-side coating apparatus in which a tip end contact portion of a die that is in sliding contact with a web is formed of a synthetic resin material that does not dissolve in the coating liquid and has no electrical conductivity.

JP 11-339785 A Japanese Patent Application Laid-Open No. 2000-113878 JP 2011-121034 A

  However, in the double-side coating apparatuses of Patent Documents 1 to 3, since the guide means for stably guiding the web is in contact with the web, there is a problem that the web is damaged by these guide means.

  In view of the above problems, an object of the present invention is to provide a double-side coating apparatus that can stably guide a traveling web.

  An embodiment of the present invention includes a first die that coats a first coating liquid on one surface of a long web traveling from upstream to downstream, and a second coating on the other surface of the web. A second die for applying a working liquid, and a guide member on one surface side of the web and extending from the upstream side of the discharge port of the first die to the discharge port, The guide member is a coating apparatus characterized in that air is blown onto one surface of the web through an air blowing portion made of a porous material.

  According to the present invention, since the guide member blows air from the air blowing port made of a porous material to one surface of the web, the web can be stably guided, and the air blowing unit and the web The web will not be damaged because of no contact.

It is explanatory drawing of the double-sided coating apparatus of Embodiment 1 of this invention. It is explanatory drawing of the double-sided coating apparatus of Embodiment 2. It is explanatory drawing of the double-sided coating apparatus of Embodiment 3.

  Hereinafter, a double-side coating apparatus 10 according to an embodiment of the present invention will be described with reference to the drawings.

Embodiment 1

  A double-sided coating apparatus 10 according to Embodiment 1 of the present invention will be described with reference to FIG.

  The long web W in this embodiment is, for example, a metal foil formed from a copper foil or an aluminum foil, or a punching foil having a hole, a film, paper, or the like.

(1) Structure of double-side coating apparatus 10 The structure of the double-side coating apparatus 10 will be described with reference to FIG.

  The double-side coating apparatus 10 includes an upper die 12, a lower die 14, a guide member 16, a first guide roll 18, and a second guide roll 20.

  The web W is unwound from the unwinding device and travels substantially horizontally through the first guide roll 18 and the second guide roll 20.

  The upper die 12 and the lower die 14 are arranged vertically symmetrically above and below the horizontal conveyance path. The upper die 12 is provided with a liquid reservoir 22 inside the die body 22, and a discharge path 24 is provided downward from the liquid reservoir 22 in a slit shape. A slit-like discharge port 26 is provided at the lower end of the discharge path 24. In order to make it easy to apply the coating liquid onto the web W by the discharge port 26, the lower portion of the main body 28 of the upper die 12 has inclined surfaces 30 and 32 so as to become thinner downward. Only a position where the discharge port 26 is provided is formed with a protrusion 34 that discharges from both the inclined surfaces 30 and 32.

  A liquid pipe 36 is connected to the main body 28 of the upper die 12, and a coating liquid applied by the upper die 12 is supplied to the liquid reservoir 22 through the liquid pipe 36. The liquid pipe 36 is connected to a pressure pump 38, and the pressure pump 38 intermittently pumps the coating liquid, and the upper die 12 intermittently coats the web W with the coating liquid. The “intermittent coating” is a coating method in which a coating section formed with a coating liquid on the web W and an uncoated section where the coating liquid is not applied are alternately formed.

  The lower die 14 is also vertically symmetrical with the upper die 12 and has the same structure.

(2) Structure of Guide Member 16 Next, the structure of the guide member 16 will be described with reference to FIG.

  The guide member 16 is formed in a thin rectangular parallelepiped shape, and is disposed between the upstream side of the lower die 14 and the discharge port 26 of the lower die 14.

  The guide member 16 is formed of a metal guide body 40, a plate-like air blowing portion 42 attached to the upper portion of the guide body 40, and a closing plate 44 that covers the lower surface on the upstream side of the air blowing portion 42. Yes.

  The air blowing portion 42 is a porous material made of ceramic or aluminum-based material, and the porous material has a pore diameter of 0.3 to 20 μm and a porosity of 10 to 20%. The upstream side of the air blowing portion 42 is formed so as to be thin along the inclined surface 32 of the main body 28 of the lower die 14, and the tip thereof extends to the protruding portion 34. A closing plate 44 made of synthetic resin is attached to the position of the inclined surface.

  An air expansion space 46 is formed between the guide main body 40 and the lower surface of the air blowing portion 42, and an air pipe 48 into which compressed air is fed into the lower surface of the air expansion space 46, that is, the lower surface of the guide main body 40. Is connected. The compressed air fed in is 0.1 to 0.2 MPa.

(3) Operational State of Double-Sided Coating Device 10 Next, an operational state in which the coating liquid is applied to the upper and lower surfaces of the web W using the double-sided coating device 10 will be described.

  In addition, as this web W, metal foil, punching foil, a film, paper etc. are mentioned as mentioned above, However, In the following description, it demonstrates using punching foil. In this double-sided coating on the punching foil, since the pressure is applied to the coating liquid applied from above and below, since there is a punching hole, it is ejected to the back surface of the web W. This is because it is necessary to apply the coating liquid from the upper die 12 and the lower die 14 at the same time and to prevent them from being ejected to the back surface. This punching foil is used as an electrode material for a secondary battery such as a lithium ion battery.

  The web W travels in a substantially horizontal direction through the first guide roll 18 and the second guide roll 20. The traveling web W passes above the guide member 16. In this case, since the compressed air is blown out from the air blowing portion 42 made of a porous material from the guide member 16, the web W travels in the horizontal direction without contacting the guide member 16. When the tension of the web W is 0.05 to 0.2 kg / cm, the amount of the web W that floats is 50 to 200 μm.

  In this way, the web W guided in the horizontal direction by the guide member 16 passes between the upper and lower upper dies 12 and 14 and the coating liquid is intermittently applied. In the intermittent coating, the web W is attracted downward due to the adhesive force of the coating liquid when the spraying is stopped from the state where the coating liquid is sprayed from the lower die 14 in particular, A state occurs in which the coating liquid cannot be cut reliably. In order to prevent this, in this embodiment, the guide liquid can be reliably cut without damaging the web W by guiding the web W without contacting the guide member 16 by the guide member 16.

  In addition, since the upstream side of the air blowing portion 42 of the guide member 16 is formed to be inclined to the protruding portion 34 of the lower die 14, it is possible to reliably guide the web W in a state where it floats to the vicinity of the protruding portion 34. .

  Further, when air is blown out, the air is blown out through the air blowing portion 42 made of a porous material, so that compressed air is blown out uniformly to the lower surface of the web W, and a part of the air is blown out strongly. Therefore, the flying height of the web W can be stably guided at 50 to 200 μm. Therefore, it can run without damaging the web W, and scratches and shavings are not generated.

(4) Effect According to the present embodiment, since the compressed air is blown out from the guide member 16 and the running web W is stably guided, intermittent coating can be performed accurately.

  In addition, since the air blowing portion 42 is formed of a porous material, the compressed air is blown out uniformly and not so strongly, so that the web W can be guided in a stably levitated state. .

  Further, since the upstream end of the air blowing portion 42 of the guide member 16 is formed to be inclined, it can be arranged up to the position of the discharge port 26 of the lower die 14, and the web W is stabilized to this position. Can guide.

Embodiment 2

  Next, the double-side coating apparatus 10 of Embodiment 2 is demonstrated based on FIG.

  The difference between the present embodiment and the first embodiment is the arrangement position of the upper die 12 and the lower die 14.

  In the first embodiment, the upper die 12 and the lower die 14 are arranged symmetrically in the vertical direction, but in the present embodiment, the upper die 12 is arranged on the upstream side of the lower die 14, that is, at the position of the first guide roll 18. In this case, the first guide roll 18 serves as a backup roll.

  Even in the double-side coating apparatus 10 according to the present embodiment, the guide member 16 is disposed below the web W on which the upper surface is coated, and the web W reaches the position of the discharge port 26 of the lower die 14 by the guide member 16. Since the guide is stable, intermittent coating can be performed accurately.

Embodiment 3

  Next, the double-side coating apparatus 10 of Embodiment 3 is demonstrated based on FIG.

  In the first and second embodiments, the web W is caused to travel in the horizontal direction (horizontal direction). However, in this embodiment, the web W is caused to travel in the vertical direction (vertical direction).

  The two dies 12 and 14 are arranged symmetrically on the conveyance path of the traveling web W, and the guide member 16 is arranged on the one die 14 side.

  Even in this embodiment, since the web W traveling in the vertical direction can be stably guided by the guide member 16, intermittent coating can be performed accurately.

Example of change

  In the above embodiment, intermittent coating is performed on the web W. However, instead of this, continuous coating in which the coating liquid is continuously coated on the web W may be used. Even in the case of continuous coating, by arranging the guide member 16, the coating thickness can be accurately maintained, and the coating accuracy is improved. This is because the height positions of the discharge port 26 and the web W are stabilized by the presence of the guide member 16.

  In the above embodiment, the same coating liquid is discharged from the two dies 12 and 14, but different coating liquids may be applied instead.

  Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... Double-side coating apparatus, 12 ... Upper die, 14 ... Lower die, 16 ... Guide member, 26 ... Discharge port, 40 ... Guide main body, 42 ... Air blowing Mouth, 44 ... obstruction plate, 46 ... air expansion space

Claims (10)

A first die for applying a first coating liquid to one surface of a long web traveling from upstream to downstream;
A second die for applying a second coating liquid to the other surface of the web;
A guide member extending from the upstream side of the discharge port of the first die to the discharge port on one surface side of the web;
Have
The guide member blows air to one surface of the web through an air blowing portion made of a porous material.
A coating apparatus characterized by that. The web runs laterally,
The first die is disposed on a lower surface of the web;
The coating apparatus according to claim 1. The first die and the second die are arranged vertically symmetrically,
The coating apparatus according to claim 2. The first die is disposed downstream of the second die;
The coating apparatus according to claim 2. The web runs in the longitudinal direction,
The coating apparatus according to claim 1. The first die and the second die are arranged symmetrically,
The coating apparatus according to claim 5. The guide member has a plate-like air blowing portion, the air supply port, and an air expansion space provided between the air supply port and the air blowing portion.
The coating apparatus according to any one of claims 1 to 6, wherein the coating apparatus is characterized in that The first die and the second die intermittently apply the first coating liquid and the second coating liquid,
The coating apparatus according to claim 1, wherein the coating apparatus is a coating apparatus. The first die and the second die continuously apply the first coating liquid and the second coating liquid,
The coating apparatus according to claim 1, wherein the coating apparatus is a coating apparatus. The porous material is a ceramic or aluminum-based material,
The coating apparatus according to claim 1, wherein the coating apparatus is a coating apparatus.

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