JP2016025323A - Method for manufacturing laminated film capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for further simply manufacturing a laminated film capacitor having high quality.SOLUTION: A method for manufacturing a laminated film capacitor made by laminating two or more metalized film includes: a step of mounting a first jig 30 made of resin to an outer peripheral surface of a drum 24; a step of winding the metalized film on the first jig 30 by twice or more so as to form a roll-shaped laminate body 20; a step of mounting a second jig 40 made of resin on the outer peripheral surface of the roll-shaped laminate body 20 so as to pressurize the first jig 30 and the second jig 40 with the laminate body 20 sandwiched therebetween; and a step of performing at least one of a pressure-aging processing, a metallikon electrode formation processing, and a disconnection processing for cutting the laminate body by a specified capacity while the laminate body 20 is sandwiched between the first jig 30 and the second jig 40.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for producing a laminated film capacitor in which a metallized film is laminated twice or more.

  2. Description of the Related Art Conventionally, a laminated film capacitor in which a metallized film obtained by vapor-depositing metal is laminated on one side of a dielectric film is known. When manufacturing such a laminated film capacitor, a metallized film is wound around a drum to form a roll-shaped laminated body. Then, after pressing this laminated body with a roll shape, or after cutting into a block shape, a metallicon electrode is formed in an end surface.

  Patent Document 1 discloses a method for manufacturing a capacitor in which a roll-shaped laminate is cut into blocks and then the block-like laminate is pressed between metal plates. In patent document 1, after pressurizing a laminated body, the metallicon electrode is formed in the end surface of the said laminated body.

  Patent Document 2 discloses a manufacturing technique in which a metallicon electrode is formed after the outer periphery of a roll-shaped laminate is squeezed with a steel belt and temporarily tightened. In Patent Document 2, after the metallicon electrode is formed, the roll-shaped laminate is wrapped with a nylon sheet and evacuated and heated under pressure, and then the roll-shaped laminate is cut into a predetermined length.

  Patent Document 3 discloses a technique in which a heat-shrinkable film is wound around the outer peripheral surface of a roll-shaped laminate, and the laminate is isotropically pressurized by heating and shrinking the film. In Patent Document 3, after isostatic pressing, metallized electrodes are formed by spraying metal onto the end face of the laminated body in a state where the contracted film is wound.

JP 2000-348966 A JP-A-5-182864 JP 2010-40573 A

  By the way, as in Patent Documents 1 and 2, the laminate is pressurized using a metal member. Such metal members are used repeatedly because they are relatively expensive. Therefore, it is necessary to remove the metal member or mask the metal member in advance so that excessive metal does not adhere to the metal member during the metallicon spraying. Met.

  In patent document 3, the laminated body is pressurized using a heat-shrinkable film. This heat-shrinkable film can be disposable even if extra metal adheres during metallicon spraying. Therefore, according to the technique of Patent Document 3, it is not necessary to remove or mask the pressurizing member (heat-shrinkable film) before metallicon spraying. , Manufacturing labor can be simplified.

  However, in Patent Document 3, it is difficult to obtain a sufficient pressure because it is a pressurization utilizing a chemical change called heat shrinkage of the film. In addition, the laminated body is finally cut into a desired capacity size, but in that case, in order to reduce burrs, it is desirable to cut the laminated body in a state of being sandwiched between resin plate materials. . However, in the technique of Patent Document 3 in which pressure is applied while a roll-shaped laminate is used, it is difficult to sandwich the laminate with a resin plate at the time of cutting, and it is difficult to prevent burrs.

  Accordingly, an object of the present invention is to provide a manufacturing method that can manufacture a high-quality multilayer film capacitor more easily.

  The manufacturing method of the present invention is a manufacturing method of a laminated film capacitor formed by laminating two or more metallized films, the step of mounting a first jig made of resin on the outer peripheral surface of the drum, Wrapping the metallized film twice or more to form a roll-shaped laminate, and mounting a second jig made of resin on the outer peripheral surface of the roll-shaped laminate, A step of sandwiching and pressing between the first jig and the second jig, a pressure aging process, a metallicon electrode forming process, and a prescribed capacity in a state where the laminate is sandwiched between the first jig and the second jig And a step of performing at least one of a cutting process for cutting the laminate.

  In a preferred aspect, the first jig and the second jig are connected to each other by a connecting member extending in the radial direction on the axial end face. In another preferred embodiment, the first jig adheres to the entire inner peripheral surface of the laminate, and the second jig adheres to the entire outer peripheral surface of the laminate.

  According to the present invention, since the first and second jigs are made of resin and can be disposable, the pressure aging treatment, the metallicon electrode formation treatment, and the sandwiched body between the first jig and the second jig, and The cutting process can be executed. In other words, it is not necessary to replace the jig for each process, and a high-quality multilayer film capacitor can be manufactured by a simple procedure.

It is a schematic block diagram of a laminated film capacitor. It is a figure which shows the mode of the manufacturing process of a multilayer film capacitor. It is AA sectional drawing in FIG. (A) is a side view of a 1st jig, (b) is BB sectional drawing. (A) is a side view of a 2nd jig, (b) is CC sectional drawing. It is a figure which shows an example of another 1st, 2nd jig.

  Embodiments of the present invention will be described below with reference to the drawings. First, the laminated film capacitor 100 manufactured in this embodiment will be briefly described. FIG. 1 is a schematic configuration diagram of a multilayer film capacitor 100. The laminated film capacitor 100 includes a laminated body 20 formed by laminating a plurality of metallized films 10. Each metallized film 10 includes a film film 12 as a dielectric made of a resin material such as polypropylene, and a metal film 14 which is vapor-deposited on the surface and forms an internal electrode. A blank portion where the metal film 14 is not formed is formed at one end of the film film 12. The plurality of metallized films 10 are laminated so that the side where the margin is formed is alternately changed.

  Metallicon electrodes 22, which are external electrodes, are provided on the left and right side surfaces of the laminate 20. These metallicon electrodes 22 are formed by metal spraying on both side surfaces of the laminate 20. As described above, since the blank portions are alternately changed, the metal film 14 is electrically connected to the different metallconic electrodes 22 alternately.

  Next, a method for manufacturing such a multilayer film capacitor 100 will be described with reference to FIGS. FIG. 2 is a diagram illustrating a manufacturing process of the multilayer film capacitor 100, and FIG. 3 is a cross-sectional view taken along line AA in FIG.

  When the laminated film capacitor 100 is manufactured, the metallized film 10 that is continuous in a belt shape is usually wound around a cylindrical drum 24 and laminated to form a roll-shaped laminated body 20. At this time, the metallized film 10 is laminated so that the blank portions formed on the metallized film 10 are alternately different. In order to laminate in such a mode, for example, a drum-like metallized film 10 with a blank portion formed on the right side and a belt-like metallized film 10 with a blank portion formed on the left side are stacked in a drum. Just wrap it around 24.

  In this embodiment, prior to winding the metallized film 10, the first jig 30 is attached to the drum 24. Further, after the metallized film 10 is wound, the second jig is applied to the outer peripheral surface of the roll-shaped laminate 20. 40 is mounted, and the roll-shaped laminate 20 is sandwiched between two jigs 30 and 40 so as to be pressurized. The first and second jigs 30 and 40 will be described with reference to FIGS.

  4A is a side view of the first jig 30, and FIG. 4B is a cross-sectional view taken along the line BB. The first jig 30 is a chain member made of resin and connecting a plurality of block bodies 32. Each block body 32 is a partial annular shape obtained by dividing the annular ring in the circumferential direction. Therefore, the inner peripheral surface and the outer peripheral surface of the block body 32 are arc surfaces having concentric and different diameters. Further, the curvature of the outer peripheral surface of the block body 32 and the number of the block bodies 32 are such that when both ends of the chain-shaped first jig 30 are coupled to each other, an annular shape having an inner diameter substantially the same as the outer diameter of the drum 24 is obtained. Has been adjusted. In order to couple both ends of the first jig 30, a coupling mechanism for coupling each other is provided in the start block body 32s located at the start end of the first jig 30 and the end block body 32e located at the termination. . Various configurations of this coupling mechanism are conceivable, but in this embodiment, a substantially arrowhead-shaped coupling projection 36a provided on the start block body 32s and a fitting provided on the end block body 32e and into which the coupling projection 36a is fitted. A coupling mechanism is constituted by the hole 36b.

  Engaging protrusions 34 are formed on both end surfaces of the first jig 30 in the axial direction (perpendicular to the plane of FIG. 4A). The engagement protrusion 34 has a wedge shape in cross section that becomes wider from the outer peripheral side (lower side in FIG. 4) to the inner peripheral side (upper side in FIG. 4) of each block body 32. Further, the axial width D3 of each block body 32 is equal to or greater than the width D1 of the metallized film 10 constituting the laminate 20, and is equal to or greater than the axial width D2 of the drum 24. Here, the reason why the width D3 of the block body 32 is not less than D1 and not less than D2 is to cover the outer peripheral surface of the drum 24 and the entire inner peripheral surface of the laminate 20 with the first jig 30. By covering the outer peripheral surface of the drum 24 and the inner peripheral surface of the laminate 20 with the first jig 30, it is possible to reliably prevent the metal sprayed when forming the metallicon electrode 22 from adhering to these surfaces.

Next, the second jig 40 will be described with reference to FIG. 5A is a side view of the second jig 40, and FIG. 5B is a cross-sectional view taken along the line C-C. Similarly to the first jig 30, the second jig 40 is also a chain member made of resin and connecting a plurality of block bodies 42. Each block body 42 is a partial annular shape, and the inner peripheral surface and the outer peripheral surface of the block body 42 are circular arc surfaces having concentric and different diameters. Further, the curvature of the inner peripheral surface of the block body 42 and the number of the block bodies 42 are substantially the same as the outer diameter of the roll-shaped laminated body 20 when the both ends of the chain-shaped second jig 40 are coupled to each other, or slightly. The ring is adjusted to have a small inner diameter.
In order to connect both ends of the second jig 40, a connecting protrusion 46a and a connecting hole 46b functioning as a connecting mechanism are provided on the starting end block body 42s located at the starting end of the second jig 40 and the terminating block body 42e located at the end. Is formed.

  The axial width D4 of the block body 42 of the second jig 40 is substantially the same as the axial width D2 of the block body 32 of the first jig 30, that is, not less than the width D1 of the metallized film 10 constituting the laminate 20. Moreover, it is more than the axial direction width D2 of the drum 24. Therefore, by mounting the second jig 40 on the outer peripheral surface of the laminated body 20, the entire outer peripheral surface of the laminated body 20 can be covered, and as a result, adhesion of the sprayed metal to the outer peripheral surface can be prevented.

  Leg portions 44 extending toward the inner periphery are formed on both axial end surfaces of each block body 42. The leg portion 44 is a part that functions as a connecting member for connecting the block body 32 of the second jig 40 and the block body 32 of the first jig 30. The leg portion 44 has a length that can reach the engaging protrusions 34 formed on both end surfaces of the first jig 30 attached to the drum 24. An engagement hole 44 a is formed at a position corresponding to the engagement protrusion 34 in the leg portion 44. When the second jig 40 is mounted on the roll-shaped laminate 20, the engagement protrusion 34 is inserted into the engagement hole 44a to be engaged therewith. Thereby, the 1st jig 30 and the 2nd jig 40 will mutually attract, and the roll-shaped laminated body 20 pinched | interposed between both will be pressurized. As described above, since the second jig 40 is wider than the metallized film 10, a certain gap is formed between the leg portion 44 and the end face of the roll-shaped laminate 20. The

  If the roll-shaped laminate 20 is pressed between the first and second jigs 30 and 40, then the roll-shaped laminate 20 is vacuum-pressurized and heated in that state. A pressure aging process is executed. In this state, the roll-shaped laminate 20 is housed in a sealed space while being sandwiched between the two jigs 30 and 40, evacuated, and heated by a heater. By this pressure aging treatment, the adhesion of the metallized film 10 is improved, and moisture in the air between the metallized films 10 is removed.

  When the pressure aging process is completed, a metallicon electrode 22 serving as an external electrode is subsequently formed on the roll-shaped laminate 20. The metallicon electrode 22 is formed by spraying metal on both end surfaces in the axial direction of the laminate 20 while the roll-like laminate 20 is sandwiched between the first and second jigs 30 and 40. Here, as a matter of course, it is desirable that this sprayed metal is attached only to the end surface in the axial direction of the roll-shaped laminate 20 and not to the inner peripheral surface or the outer peripheral surface. Further, since the drum 24 is also a facility that is repeatedly used, it is desirable that the thermal spray metal does not adhere to the drum 24 as well. In the present embodiment, the outer peripheral surface of the drum 24 and the inner and outer peripheral surfaces of the roll-shaped laminate 20 are covered with the first jig 30 and the second jig 40. Therefore, it can prevent reliably that a metal adheres to such a surface.

  If the metallicon electrode 22 is formed, then the roll-shaped laminate 20 is cut at a desired capacity, in other words, a desired circumference, and taken out as a block-like laminate 20. Two broken lines L in FIG. 2 show an example of this cut portion. This cutting is also performed while the roll-shaped laminate 20 is sandwiched between the first jig 30 and the second jig 40. The reason why the laminate 20 is cut while being sandwiched between the first and second jigs 30 and 40 is to prevent burrs. That is, the inner peripheral surface and the outer peripheral surface of the laminated body 20 are turned up by cutting the first and second jigs 30 and 40 in close contact with the inner peripheral surface and the outer peripheral surface of the roll-shaped laminated body 20. (Burr generation) is suppressed.

  Note that it is desirable that the cutting interval (peripheral length) be equal to or greater than the perimeter of the block bodies 32 and 42, and that at least one leg portion 44 is included between the cut locations. With this configuration, the first and second jigs 30 and 40 sandwiching the laminate 20 are connected to each other via the leg portions 44 even after being cut out as the block-like laminate 20. . As a result, the first and second jigs 30 and 40 continue to sandwich the laminate 20 without being separated from each other, so that the first and second jigs 30 and 40 hold the block-like laminate 20. It also plays a role like a case.

  Here, as is apparent from the above description, in this embodiment, with the first jig 30 and the second jig 40 attached, the pressure aging process, the metallicon electrode 22 formation process, and the cutting process are performed. Yes. Thereby, compared with the conventional laminated film capacitor manufacturing method, the labor concerning manufacture can be reduced significantly.

  That is, in many conventional manufacturing methods, a metal jig is often used to hold the laminate 20. Metal jigs are used repeatedly because they are relatively expensive. For this reason, when the metallicon electrode 22 is formed, the metal to be sprayed must be replaced with another jig having a special shape so that the metal jig does not adhere to the metal jig, or the metal jig must be masked in advance. I had to.

  Further, when a metal jig is used, the laminate 20 cannot be cut with the metal jig attached, and therefore the metal jig must be removed. After removing the metal jig, a resin plate was brought into close contact with the laminate 20 to prevent burrs, and the resin plate was cut together with the laminate 20. That is, in the conventional manufacturing method using a metal jig, the jig must be changed every time the process is changed, which is very troublesome.

  Patent Document 3 discloses a manufacturing method that does not use a metal jig. In this patent document 3, the technique which winds a heat-shrinkable film around the outer peripheral surface of the roll-shaped laminated body 20, and heat-shrinks this film and isotropically pressurizes the laminated body 20 is disclosed. . Further, since this heat-shrinkable film is assumed to be disposable, the metallicon electrode 22 is formed with the film attached. That is, according to the technique of Patent Document 3, it is not necessary to replace the jig or mask the jig every time the process is performed.

  However, as in Patent Document 3, it is very difficult to adjust the pressing force by a pressurizing method that relies on a chemical change called heat shrinkage. In addition, with a thin heat-shrinkable film, it is difficult to effectively prevent burrs of the laminate 20 that occur at the time of cutting, and it is necessary to prepare some other jig. Furthermore, in Patent Document 3, a heat-shrinkable film (resin jig) is disposed only on the outer peripheral surface of the roll-shaped laminate 20. Therefore, if the roll-shaped laminate 20 is cut into a block shape and taken out, the heat-shrinkable film is separated from the laminate 20. As a result, another case or the like must be prepared to protect the block-shaped laminate 20.

  That is, in the conventional manufacturing method, it is necessary to replace the jig between the time when the metallized film 10 is laminated in a roll shape and the time when the metalized film 10 is cut into a block shape. On the other hand, as is apparent from the above description, in the present embodiment, the first and second jigs 30 and 40 made of resin are attached after the roll-shaped laminated body 20 is formed and cut out into a block shape. I'm leaving it. This is because the first and second jigs 30 and 40 are both made of resin and relatively inexpensive and can be disposable. That is, since the first and second jigs 30 and 40 can be made disposable, there is no need to worry about the adhesion of the sprayed metal, and the two jigs 30 and 40 are still attached when the metallicon electrode 22 is formed. it can. Moreover, since it is resin and is comparatively soft, it can cut | disconnect with the roll-shaped laminated body 20 with mounting | wearing. At this time, since the first and second jigs 30 and 40 are in close contact with the inner peripheral surface and the outer peripheral surface of the roll-shaped laminate 20 and restrain these surfaces, the occurrence of burrs is effectively prevented. it can. Furthermore, since the two jigs 30 and 40 sandwich and protect the block-shaped laminated body 20 even after being cut out, it is not necessary to prepare a protective case or the like separately.

  Further, in the present embodiment, the binding force by the second jig 40 having an inner diameter that is the same as or slightly smaller than the outer diameter of the roll-shaped laminate 20, and the first and second jigs 30, 40 via the legs 44. The pressurizing force of the roll-shaped laminate 20 is generated by the mechanical coupling force. In other words, in this embodiment, the pressurizing force is generated by a mechanical action, so that the pressurizing force can be easily and reliably adjusted as compared with Patent Document 3 in which the pressurizing force is generated by a chemical change. .

  In the present embodiment, the first and second jigs 30 and 40 have a chain shape in which a plurality of partial annular block bodies 32 are connected. However, the first and second jigs 30 and 40 can be mounted on the outer peripheral surfaces of the drum 24 and the roll-shaped laminate 20. If so, the first and second jigs 30 and 40 may have other forms. For example, as shown in FIG. 6, the first and second jigs 30 and 40 may have a shape obtained by dividing an annular ring into two.

  Further, in this embodiment, the first jig 30 is provided with the engaging projection 34 and the second jig 40 is provided with the leg portion 44. However, as long as the two jigs 30 and 40 can be connected to each other so as to pull each other, other It may be changed to the configuration. For example, the leg portion 44 may be provided on the first jig 30 and the engagement protrusion 34 may be provided on the second jig 40. Further, the leg portion 44 may not be formed integrally with the jigs 30 and 40 but may be formed as a plate material separate from the jigs 30 and 40. Further, the coupling mechanism may be omitted as long as a sufficient pressing force can be obtained only by the binding force of the second jig 40.

  Moreover, in this embodiment, although manufacturing in order of pressure aging, formation of the metallicon electrode 22, and cutting out in the block shape, since the laminated body 20 is sandwiched between the first and second jigs 30 and 40, it is performed. If present, the order of these steps may be appropriately changed. In addition, if at least one of the pressure aging process, the metallicon electrode 22 forming process, and the cutting process is performed while sandwiched between the two jigs 30 and 40, the other processes are performed by removing the jigs 30 and 40. You may carry out in a state.

  10 Metallized film, 12 Film film, 14 Metal film, 20 Laminated body, 22 Metallicon electrode, 24 Drum, 30 First jig, 32, 42 Block body, 34 Engagement protrusion, 36a, 46a Coupling protrusion, 36b, 46b Fit Joint hole, 40 2nd jig, 44 legs, 100 laminated film capacitor.

Claims (3)

A method for producing a laminated film capacitor in which two or more metallized films are laminated,
Mounting a first jig made of resin on the outer peripheral surface of the drum;
Winding the metallized film twice or more on the first jig to form a roll-shaped laminate;
Attaching a second jig made of resin to the outer peripheral surface of the roll-shaped laminate, sandwiching the laminate between the first jig and the second jig, and pressurizing;
Performing at least one of a pressure aging process, a metallicon electrode forming process, and a cutting process of cutting the stacked body with a specified capacity in a state where the stacked body is sandwiched between the first jig and the second jig; ,
A method for producing a laminated film capacitor, comprising: The manufacturing method according to claim 1,
The first jig and the second jig are connecting members extending in the radial direction on the axial end face, and are connected to each other. It is a manufacturing method of Claim 1 or 2, Comprising:
The first jig adheres to the entire inner peripheral surface of the laminate,
The second jig is in close contact with the entire outer peripheral surface of the laminate.
A method for producing a laminated film capacitor, comprising:

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