JP2018081808A - Method for manufacturing film junction body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a film junction body capable of inhibiting a film member from being thermally welded to a heating roller.SOLUTION: In a method for manufacturing a film junction body 34, a first film member 56 and a second film member 60 are sandwiched and pressed by a first bonding roller 68 and a second bonding roller 70. In this manufacturing method, the bonding roller 68 in a heating state serving as a heating roller is arranged in a retracted position separated from the first film member 56 and the second film member 60 in a state where transport of the first film member 56 and the second film member 60 is stopped.SELECTED DRAWING: Figure 1

Description

  In the present invention, a first film member having a film-like electrolyte membrane provided with a support film and a second film member having a film-like electrode are overlapped with each other while being conveyed by a conveyance roller and sandwiched between two bonding rollers. It is related with the manufacturing method of the film joined body which joins the said electrolyte membrane and the said electrode by pressing and manufactures a film joined body.

  In general, a polymer electrolyte fuel cell includes an electrolyte membrane / electrode structure (MEA). The electrolyte membrane / electrode structure is provided on a solid polymer electrolyte membrane made of a polymer ion exchange membrane, an anode electrode provided on one surface of the solid polymer electrolyte membrane, and the other surface of the solid polymer electrolyte membrane. Cathode electrode.

  The electrolyte membrane / electrode structure is manufactured by a roll-to-roll method (see Patent Documents 1 to 6). In this manufacturing method, for example, a film-shaped electrolyte membrane and a film-shaped electrode are overlapped with each other while being transported, and sandwiched between two heating rollers and pressed to be bonded (patent) Reference 1 and 2).

JP 2014-203523 A JP 2009-037916 A JP 2010-176897 A JP 2007-087775 A JP 2010-118237 A JP, 2006-091997, A

  However, in the conventional techniques such as Patent Documents 1 and 2 described above, when the production of the film joined body is interrupted (when the conveyance of the film is stopped), the heating roller in the heat generation state comes into contact with the film member. The film member may be thermally welded to the roller.

  Such a problem may also occur when the heating roller is in contact with the film member when the temperature of the heating roller is raised in the preparation stage.

  This invention is made | formed in view of such a subject, and it aims at providing the manufacturing method of the film assembly which can suppress that a film member heat-welds to a heating roller.

  The method for producing a film assembly according to the present invention includes a first film member having a film-like electrolyte membrane provided with a support film and a second film member having a film-like electrode, which are overlapped with each other while being conveyed by a conveying roller. By combining and pressing between the two joining rollers, the electrolyte membrane and the electrode are joined together to produce a film joined body.

  At least one of the two joining rollers is a heating roller that heats the first film member and the second film member, a pressing position that presses the first film member and the second film member, and the first film member and the first film member. 2 Moveable to a retracted position away from the film member.

  And in this film joined body manufacturing method, the heated heating roller is disposed at the retracted position in a state where the conveyance of the first film member and the second film member is stopped.

  In this method of manufacturing a joined film, it is preferable that the heating roller is disposed at the retracted position when the heating roller is heated.

  In this method of manufacturing a film joined body, when the conveyance of the first film member and the second film member is stopped during the joining of the electrolyte membrane and the electrode by the two joining rollers, the heated heating roller is moved from the pressing position. It is preferable to move to the retracted position.

  In this method of manufacturing a joined film, the two joining rollers are constituted by a heating roller and a driving roller. When the electrolyte membrane and the electrode are joined together, the driving roller is brought into contact with the second film member and the heating roller is used. It is preferable to contact the support film.

  According to the present invention, the heating roller in the heat generation state is disposed at the retracted position separated from the first film member and the second film member in a state where the conveyance of the first film member and the second film member is stopped. The film members (first film member and second film member) can be prevented from being thermally welded to the heating roller.

It is a schematic block diagram of the manufacturing apparatus of the film joined body used for the manufacturing method of the film joined body which concerns on one Embodiment of this invention. 2A is a partially omitted longitudinal sectional view of the first film member, FIG. 2B is a partially omitted longitudinal sectional view showing a state in which an interlayer paper is provided on the second film member, and FIG. 2C is a film joined body. FIG. 2D is a partially omitted longitudinal sectional view showing a state where a support film is provided, and FIG. 2D is a partially omitted longitudinal sectional view of the film joined body. It is a flowchart which shows an example of the manufacturing method of a film joined body. It is explanatory drawing which shows the state which is heating up the 1st joining roller in a retracted position. It is explanatory drawing which shows the state which has mutually joined the 1st film member and the 2nd film member. It is explanatory drawing which shows the state which moved the 1st joining roller from the pressing position to the retracted position at the time of conveyance stop of a 1st film member and a 2nd film member. FIG. 3 is a partially omitted vertical cross-sectional view of an electrolyte membrane / electrode structure.

  Hereinafter, preferred embodiments of the method for producing a film joined body according to the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 7, the method for manufacturing a film assembly 34 according to an embodiment of the present invention is used for manufacturing an electrolyte membrane / electrode structure 10 of a fuel cell. First, the electrolyte membrane / electrode structure 10 will be described. The electrolyte membrane / electrode structure 10 is sandwiched between an anode separator and a cathode separator (not shown) to constitute a power generation cell of a fuel cell.

  The electrolyte membrane / electrode structure 10 includes a solid polymer electrolyte membrane 12 that is a thin film of perfluorosulfonic acid containing moisture, and an anode electrode 14 and a cathode electrode 16 that sandwich the solid polymer electrolyte membrane 12. The solid polymer electrolyte membrane 12 is a cation exchange membrane, and an HC (hydrocarbon) electrolyte membrane may be used in addition to the fluorine electrolyte.

  The anode electrode 14 is provided on one surface of the solid polymer electrolyte membrane 12, and the cathode electrode 16 is provided on the other surface of the solid polymer electrolyte membrane 12. The anode electrode 14 has a smaller planar dimension (outer dimension) than the solid polymer electrolyte membrane 12, and the cathode electrode 16 has the same planar dimension as the solid polymer electrolyte membrane 12. However, the anode electrode 14 may have the same planar dimension as the solid polymer electrolyte membrane 12, and the cathode electrode 16 may have a smaller planar dimension than the solid polymer electrolyte membrane 12. Further, both the anode electrode 14 and the cathode electrode 16 may have a smaller planar dimension than the solid polymer electrolyte membrane 12.

  The anode electrode 14 includes an electrode catalyst layer 18 bonded to one surface of the solid polymer electrolyte membrane 12 and a gas diffusion layer 20 laminated on the electrode catalyst layer 18. The electrode catalyst layer 18 is formed by uniformly applying porous carbon particles carrying a platinum alloy on the surface thereof to the surface of the gas diffusion layer 20. The gas diffusion layer 20 is formed of a microporous layer 22 having porosity and conductivity, and a carbon layer 24 such as carbon paper or carbon cloth.

  The cathode electrode 16 includes an electrode catalyst layer 26 bonded to the other surface of the solid polymer electrolyte membrane 12 and a gas diffusion layer 28 stacked on the electrode catalyst layer 26. The electrode catalyst layer 26 is formed by uniformly applying porous carbon particles carrying a platinum alloy on the surface thereof to the surface of the gas diffusion layer 28. The gas diffusion layer 28 is formed of a microporous layer 30 having porosity and conductivity, and a carbon layer 32 such as carbon paper or carbon cloth.

  The microporous layer 22 and the microporous layer 30 may be provided as necessary, and may be unnecessary.

  When manufacturing such an electrolyte membrane / electrode structure 10, for example, after manufacturing a film assembly 34 in which the solid polymer electrolyte membrane 12 and the cathode electrode 16 are bonded, the solid polymer of the film assembly 34 is manufactured. It is manufactured by bonding an anode electrode 14 to the electrolyte membrane 12.

  Next, the manufacturing apparatus 40 for the film joined body 34 will be described. As shown in FIG. 1, the manufacturing apparatus 40 of the film joined body 34 is provided with the some conveyance roller 42 which conveys a film-form member. That is, the film joined body 34 is manufactured by a roll-to-roll method. The manufacturing apparatus 40 for the film joined body 34 includes a first film roll 44, a second film roll 46, an interlayer paper removing mechanism 48, a joining mechanism 50, a peeling mechanism 52, and a winding unit 54.

  The first film roll 44 is obtained by winding the first film member 56. In FIG. 2A, the first film member 56 is configured such that a support film 58 is detachably bonded to one surface of a film-like solid polymer electrolyte membrane 12. The support film 58 protects one surface of the solid polymer electrolyte membrane 12, and is made of, for example, a polyester resin such as PET (polyethylene terephthalate) or PEN (polyethylene naphthalate), a polystyrene resin, or the like. . The first film member 56 of the first film roll 44 is transported to the joining mechanism 50 by the transport roller 42.

  As shown in FIG. 1, the second film roll 46 is obtained by winding the second film member 60. An interlayer paper 62 for protecting the second film member 60 that is the cathode electrode 16 is disposed on the second film roll 46 (see FIG. 2B). The second film member 60 of the second film roll 46 is transported to the joining mechanism 50 by the transport roller 42.

  The interlayer paper removing mechanism 48 includes a removal roller 64 for removing the interlayer paper 62 fed from the second film roll 46 together with the second film member 60 from the second film member 60, and the interlayer paper removed by the removal roller 64. And an interlayer paper take-up portion 66 around which 62 is wound.

  As shown in FIGS. 1 and 5, the joining mechanism 50 includes a second film member conveyed from the solid polymer electrolyte membrane 12 of the first film member 56 and the second film roll 46 conveyed from the first film roll 44. The cathode electrode 16, which is 60, is joined to each other, and includes a first joining roller (nip roller) 68 and a second joining roller 70. The first joining roller 68 is disposed on the opposite side of the first film member 56 from the second film member 60, and the second joining roller 70 is the first film member 56 with respect to the second film member 60. Located on the opposite side.

  The first joining roller 68 is configured as a heating roller, and has, for example, a heater portion 72 that generates heat when energized. As shown in FIG. 1, the first joining roller 68 is movable to a pressing position that contacts the support film 58 of the first film member 56 and a retracted position that is separated from the first film member 56 and the second film member 60. It is configured. In FIG. 1, the first joining roller 68 at the pressing position is indicated by a solid line, and the first joining roller 68 at the retracted position is indicated by an imaginary line.

  Specifically, the first joining roller 68 is separated from the first film member 56 at the retracted position on the side opposite to the side where the second joining roller 70 is located. That is, the first joining roller 68 is not in contact with the first film member 56 and the second film member 60 at the retracted position.

  As shown in FIG.1 and FIG.5, the 2nd joining roller 70 is comprised as a drive roller rotated by the effect | action of the motor which is not shown in figure. The second joining roller 70 is in contact with the second film member 60 (the carbon layer 32 of the cathode electrode 16).

  In FIG. 1, the peeling mechanism 52 includes a peeling roller 74 that peels the support film 58 from the film joined body 34 fed out from the bonding mechanism 50, and a support film winding unit that winds the support film 58 peeled by the peeling roller 74. 76.

  The winding unit 54 winds the film assembly 34 conveyed from the peeling mechanism 52 in a state in which the interlayer paper 80 supplied from the interlayer paper roll 78 is overlapped.

  The manufacturing apparatus 40 of the film joined body 34 is basically configured as described above. Next, a method for producing the film joined body 34 according to the present embodiment will be described with reference to the flowchart of FIG. To do.

  First, as shown in FIG. 1, the first joining roller 68 is disposed at the retracted position (step S <b> 1 in FIG. 3), and the first film member 56 of the first film roll 44 and the second film member of the second film roll 46. 60 is set in the manufacturing apparatus 40 of the film joined body 34 (step S2).

  Thereafter, the heater unit 72 is energized to raise the temperature of the first joining roller 68 (step S3). At this time, as shown in FIG. 4, since the first joining roller 68 is not in contact with the first film member 56 and the second film member 60, the first film member 56 and the second film member 60 are the first. There is no thermal welding to the joining roller 68.

  Subsequently, the conveyance of the first film member 56 and the second film member 60 is started (step S4), and the first joining roller 68 is moved from the retracted position to the pressing position (step S5).

  Then, the first film member 56 of the first film roll 44 is conveyed to the bonding mechanism 50 by the conveyance roller 42, and the second film member 60 of the second film roll 46 is conveyed to the bonding mechanism 50 by the conveyance roller 42. Note that the interlayer paper 62 sent out together with the second film member 60 from the second film roll 46 is removed from the second film member 60 by the removal roller 64 and is taken up by the interlayer paper take-up portion 66.

  As shown in FIG. 5, the first film member 56 and the second film member 60 conveyed to the bonding mechanism 50 are overlapped with each other. Specifically, the solid polymer electrolyte membrane 12 of the first film member 56 and the electrode catalyst layer 26 of the second film member 60 are in contact with each other. And the laminated | stacked 1st film member 56 and the 2nd film member 60 are mutually joined by the joining mechanism 50 (step S6). Specifically, the first film member 56 and the second film member 60 are sandwiched between the first joining roller 68 and the second joining roller 70 at the pressing position, and are pressed and heated, so that the solid polymer electrolyte The membrane 12 and the electrode catalyst layer 26 are joined together to form a film assembly 34 (see FIG. 2C).

  As shown in FIG. 1, the film joined body 34 sent out from the joining mechanism 50 is conveyed to the peeling mechanism 52. Then, the support film 58 is peeled from the film assembly 34 by the peeling roller 74 (see step S7, FIG. 2D). The peeled support film 58 is taken up by the support film take-up unit 76.

  The film joined body 34 from which the support film 58 has been peeled is wound around the winding portion 54 in a state where the interlayer paper 80 supplied from the interlayer paper roll 78 is overlapped (step S8). Thereby, the film joined body 34 is manufactured.

  When continuing manufacture of the film joined body 34, conveyance of the 1st film member 56 and the 2nd film member 60 is continued (step S9: NO), and the process of step S6-step S8 of FIG. 3 mentioned above is performed. On the other hand, when the production of the film bonded body 34 is interrupted (the operation of the manufacturing apparatus 40 for the film bonded body 34 is stopped), the conveyance of the first film member 56 and the second film member 60 is stopped (step S9: YES). As shown in FIG. 6, the first joining roller 68 is moved from the pressing position to the retracted position (step S10).

  Thereby, the first joining roller 68 is separated from the first film member 56 and the second film member 60. Therefore, the first film member 56 and the second film member 60 are not thermally welded to the first joining roller 68.

  In the example of FIG. 6, the second joining roller 70 is in contact with the second film member 60. However, since the second joining roller 70 is not a heating roller, the second film member 60 is not thermally welded to the second joining roller 70. Note that the second joining roller 70 may be configured as a heating roller. In this case, since the second film member 60 in contact with the second bonding roller 70 is the cathode electrode 16 formed of the carbon layer 32, the microporous layer 30, and the gas diffusion layer 28, the second bonding roller 70 is a heating roller. Even if it exists, the malfunction that the 2nd film member 60 (cathode electrode 16) sticks or welds to the 2nd joining roller 70 does not occur easily. However, it goes without saying that the second joining roller 70 may be separated from the second film member 60.

  Thereafter, the heating of the first joining roller 68 is stopped by stopping the energization of the heater unit 72 of the first joining roller 68 (step S11).

  The film joined body 34 thus manufactured is processed into a predetermined size, and the anode electrode 14 is joined to the solid polymer electrolyte membrane 12 of the film joined body 34. Thereby, the electrolyte membrane / electrode structure 10 for a fuel cell shown in FIG. 7 is manufactured.

  According to the present embodiment, the first bonding roller 68 (heating roller) in the heat generation state is moved from the first film member 56 and the second film in a state where the conveyance of the first film member 56 and the second film member 60 is stopped. It is disposed at a retracted position separated from the member 60.

  Thereby, it can avoid that the same part of the 1st film member 56 contacts the 1st joining roller 68 of the heat_generation | fever state for a comparatively long time. Therefore, it is possible to suppress the first film member 56 and the second film member 60 from being thermally welded to the first joining roller 68.

  The first joining roller 68 in the heat generation state refers to the first joining roller 68 in a temperature state in which the support film 58 (the first film member 56 or the second film member 60) is thermally welded. Specifically, the first joining roller 68 in a state where the temperature is raised by energizing the heater portion 72, and the first joining roller 68 in a state where the temperature rise is completed (when the electrolyte membrane 12 and the cathode electrode 16 are joined). And the first joining roller 68 in a relatively high temperature after the energization to the heater unit 72 is stopped.

  Further, since the first joining roller 68 is disposed at the retracted position when the temperature of the first joining roller 68 in the preparation stage is increased, the first film member 56 and the second film member 60 are heated to the first joining roller 68. Welding can be suppressed.

  Further, when the transport of the first film member 56 and the second film member 60 is stopped during the joining of the solid polymer electrolyte membrane 12 and the cathode electrode 16 by the first joining roller 68 and the second joining roller 70, a heat generation state occurs. The first joining roller 68 is moved from the pressing position to the retracted position. Therefore, it is possible to prevent the first film member 56 and the second film member 60 from being thermally welded to the first joining roller 68 even when the production of the film joined body 34 is interrupted.

  Furthermore, when the solid polymer electrolyte membrane 12 and the cathode electrode 16 are bonded to each other, the first bonding roller 68 is brought into contact with the support film 58 and the second bonding roller 70 is brought into contact with the second film member 60. That is, the solid polymer electrolyte membrane 12 and the cathode electrode 16 used as products do not directly contact the first joining roller 68 that is a heat generating member. Therefore, when conveyance of the 1st film member 56 and the 2nd film member 60 stops, it can suppress that the solid polymer electrolyte membrane 12 and the cathode electrode 16 are heated excessively.

  The present embodiment is not limited to the configuration and method described above. In the example described above, the first joining roller 68 is a heating roller and the second joining roller 70 is a driving roller. However, the first joining roller 68 is configured as a driving roller and the second joining roller 70 is used as a heating roller. It may be configured. In this case, when the conveyance of the first film member 56 and the second film member 60 is stopped, the second joining roller 70 in the heat generation state is at a retracted position separated from the first film member 56 and the second film member 60. Will be placed.

  Further, both the first joining roller 68 and the second joining roller 70 may be heating rollers. In this case, when the conveyance of the first film member 56 and the second film member 60 is stopped, both the first bonding roller 68 and the second bonding roller 70 in the heat generation state are the first film member 56 and the second film member. It will be arranged at a retracted position separated from 60. However, as described above, when the second film member 60 is the cathode electrode 16 made of a material that is difficult to weld to the second bonding roller 70 that is a heating roller, the second bonding roller 70 is not necessarily in the retracted position. (It may not be located at the pressing position).

  The manufacturing method of the film joined body according to the present invention is not limited to the above-described embodiment, and various methods can be adopted without departing from the gist of the present invention.

  For example, the anode electrode may be configured as the second film member, and the film assembly may be formed by bonding the anode electrode to the solid polymer electrolyte membrane.

  Further, for example, the second film member may be configured by providing a sheet-like electrode (cathode electrode or anode electrode) in a detachable manner on a web-like base film. In this case, the film joining provided with the electrode having a plane dimension smaller than the plane dimension of the solid polymer electrolyte membrane by joining the solid polymer electrolyte membrane of the first film member and the electrode of the second film member to each other The body can be manufactured easily.

12. Solid polymer electrolyte membrane (electrolyte membrane)
DESCRIPTION OF SYMBOLS 16 ... Cathode electrode 34 ... Film joined body 42 ... Conveyance roller 56 ... 1st film member 58 ... Support film 60 ... 2nd film member 68 ... 1st joining roller (heating roller) 70 ... 2nd joining roller (drive roller)

Claims (4)

A first film member having a film-like electrolyte membrane provided with a support film and a second film member having a film-like electrode are overlapped with each other while being conveyed by a conveyance roller, and sandwiched between two bonding rollers and pressed. According to the method for manufacturing a film assembly, in which the electrolyte membrane and the electrode are bonded to each other to manufacture a film assembly,
At least one of the two joining rollers is a heating roller that heats the first film member and the second film member, and a pressing position that presses the first film member and the second film member; Movable to a retracted position spaced apart from the first film member and the second film member;
In a state where conveyance of the first film member and the second film member is stopped, the heating roller in a heat generation state is disposed at the retracted position.
The manufacturing method of the film joined body characterized by the above-mentioned. In the manufacturing method of the film joined body according to claim 1,
The heating roller is disposed at the retracted position when the heating roller is heated.
The manufacturing method of the film joined body characterized by the above-mentioned. In the manufacturing method of the film joined body according to claim 1 or 2,
When the conveyance of the first film member and the second film member is stopped during the joining of the electrolyte membrane and the electrode by the two joining rollers, the heating roller in the heat generation state is retracted from the pressing position. Move it to a position,
A method for producing a joined film, comprising: In the manufacturing method of the film conjugate | zygote of any one of Claims 1-3,
The two joining rollers are composed of the heating roller and the driving roller,
When joining the electrolyte membrane and the electrode to each other, the driving roller is brought into contact with the second film member and the heating roller is brought into contact with the support film;
The manufacturing method of the film joined body characterized by the above-mentioned.

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