JP2013074000A - Manufacturing method of laminate film capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a laminate film capacitor efficiently and accurately, and to enhance the withstand voltage of a capacitor by ensuring the insulation distance of a metal film sufficiently on the cut surface of a capacitor element.SOLUTION: In the manufacturing method of a laminate film capacitor where a capacitor element is formed by laminating a metalization film 10 having a metal film deposited on one surface of a film, the metalization film is taken up continuously around the outer periphery of a drum 20 having a polygonal outer shape, the metal film is removed by performing burn-off of the metalization film located in a predetermined range including the vertices of the polygon in the drum 20, and then the metalization film is cut in the range where the metal film is removed by the burn-off.

Description

  The present invention relates to a method for manufacturing a laminated film capacitor in which a capacitor element is formed by laminating a metallized film having a metal film deposited on a film film.

In general, the capacitor element is formed by cutting a metallized film into a predetermined size and laminating a plurality of the cut metallized films. In addition, there is also known a technique in which a metallized film is first laminated and cut into a predetermined dimension to form a capacitor element (Patent Document 1). In any case, on the cut surface of the capacitor element, the metal film wraps around and is exposed when the metallized film is cut, and the metal films of the laminated metallized film are easily short-circuited. This causes a reduction in the withstand voltage of the capacitor.
As a countermeasure, a process for removing the end portion of the metal film located on the cut surface of the capacitor element is necessary. In the technique of Patent Document 1, an etching process using plasma is performed on the cut surface of the capacitor element. The edge part of the metal film located in this cut surface is removed.

Japanese Patent No. 2742818

  For example, in the technique disclosed in Patent Document 1, an operation of laminating and cutting a metallized film and an operation of removing an end portion of a metal film located on a cut surface of a capacitor element after molding are individually performed by an etching process. Therefore, the production efficiency of the laminated film capacitor is poor. In addition, since the etching process is performed after cutting the laminated metallized film, the metal film may not be removed as desired, and the insulation distance of the metal film is not sufficiently secured.

  An object of the present invention is to solve such a problem, and an object of the present invention is to make it possible to efficiently and accurately manufacture a laminated film capacitor and to provide a sufficient insulation distance of the metal film at the cut surface of the capacitor element. It is necessary to increase the withstand voltage of the capacitor.

The present invention is for achieving the above object, and is configured as follows.
A method of manufacturing a laminated film capacitor in which a capacitor element is formed by laminating a metallized film having a metal film deposited on one side of the film film, wherein the metallized film is continuously wound around the outer periphery of a drum having a polygonal outer shape. After removing the metal film by performing burn-off treatment on the metallized film located within a predetermined range including the vertex of the polygon in this drum, the metallization is performed within the range where the metal film is removed by this burn-off process. The film is cut.

More preferably, a metallized film is continuously wound on the outer periphery of a drum having a regular polygonal outer shape.
More preferably, the metallized film is individually fed to and wound up at a plurality of locations on the outer periphery of the drum.
More preferably, the metallized film after the burn-off treatment is cut while being wound on the drum.

In the present invention, the metallized film is continuously wound around the outer periphery of the drum, and the metal film located in a predetermined range is removed by the burn-off process, whereby the lamination of the metallized film and the burn-off process are performed. Can be done in parallel. As a result, a laminated film capacitor can be manufactured efficiently.
In particular, in the metallized film wound around the outer periphery of the drum, after removing the metal film of the portion located within a predetermined range including the polygonal vertex of the drum, the metallized film is also cut within the range. By removing the portion, the capacitor element can be formed only with the metallized film laminated on the flat outer periphery of the drum.
Further, since the metallized film is cut after being burned off, a sufficient insulation distance of the metal film on the cut surface of the capacitor element is ensured, and the withstand voltage as the capacitor can be increased.

  Further, by winding the metallized film on a regular polygonal drum, the dimensions between the cut surfaces of the capacitor elements formed of the metallized film laminated on the flat outer periphery of the drum are evenly aligned. In addition, the burn-off processing position of the metallized film is accurately overlapped without shifting, and the subsequent cutting operation is facilitated.

Further, by feeding and winding the metallized film to a plurality of locations on the outer periphery of the drum, the metallized film is efficiently laminated, and as a result, the cycle time for forming the capacitor element is shortened.
In addition, by cutting the metallized film after the burn-off process while being wound on the drum, the process of removing the metal film and the process of cutting the metallized film are performed in separate processes as before. Unlike what has been known, quality control of the metallized film between processes becomes unnecessary.

The perspective view showing a multilayer film capacitor. Explanatory drawing showing the formation process of the general capacitor | condenser element. The front view showing a capacitor element. The perspective view showing the metallized film wound by roll shape. The front view showing the apparatus which performs a burn-off process, laminating | stacking a metallized film. FIG. 6 is a perspective view illustrating a part of FIG. 5. Explanatory drawing which expressed the metallized film laminated | stacked on the drum outer periphery of FIG. 5 exaggeratingly. The front view showing the example of a change of FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
The laminated film capacitor shown in FIG. 1 is mainly composed of a capacitor element 12 formed by laminating a plurality of metallized films 10. Each metallized film 10 includes a film film 10A as a dielectric made of a resin material such as polypropylene, and a metal film 10B deposited on the surface thereof.
The upper and lower surfaces of the capacitor element 12 are covered with a protective film 14, and electrodes 16 are provided on both the left and right side surfaces of the capacitor element 12. These electrodes 16 are formed by metal spraying (metallicon) on both side surfaces of the capacitor element 12.

In a general molding process of the capacitor element 12, as shown in FIG. 2, the metallized film 10 that is continuous in a strip shape is sequentially cut into a predetermined product size in a two-layered state, for example, and then laminated. For this reason, the metal film 10B of each metallized film 10 laminated | stacked becomes the arrangement | positioning which intervened each film film 10A (FIG. 1, FIG. 3).
In the capacitor element 12, the metal film 10 </ b> B of each of the metallized films 10 stacked on the left and right electrodes 16 is formed on the left and right side surfaces (hereinafter referred to as “metallicon surface 12 a”) in FIG. They are alternately electrically connected (FIG. 1). The end of the metal film 10B on the side not connected to the electrode 16 is due to a margin 13 (inside margin) of the metal film 10B in the metallized film 10 described later.

In the capacitor element 12, the end portions of the metal film 10 </ b> B of each layer are removed on both the left and right side surfaces (hereinafter referred to as “laminated cut surface 12 b”) of FIG. 3 where the cut surfaces of the metallized film 10 are laminated. It is stopped at a position retracted from the surface 12b. This is due to a burn-off process for the metal film 10B described later.
In addition, after the electrode 16 by metal spraying is formed on the metallicon surface 12a of the capacitor element 12, the aging process is performed. In the aging process, the laminated metallized film 10 is kept in a state of being pressurized at a constant pressure, thereby improving the adhesion of the metallized film 10 or removing moisture in the air between the metallized films 10. Processing is performed.

The band-like metallized film 10 is wound into a roll as shown in FIG. 4, and a metal film 10B is deposited on the side of the film film 10A in the width direction, leaving a margin 13 with a predetermined width. ing. Two such roll-shaped metallized films 10 are prepared, stacked such that the blank portions 13 are positioned on the opposite sides, cut into predetermined dimensions, and stacked to form the capacitor shown in FIG. Element 12 is formed. Then, on the metallicon surface 12 a of the capacitor element 12, the metal film 10 </ b> B of each layer is in an electrically connected state to the left and right electrodes 16 alternately.
As an example of the work for preparing the metallized film 10 shown in FIG. 4, a blank film is left on both sides in the width direction while feeding a ready-made film film having a width twice that of the film film 10A shown in FIG. After metal spraying, it is divided into two at the center of the film width and each is wound up individually. Thereby, two roll-shaped metallized films 10 shown in FIG. 4 are prepared.

Next, means for performing the burn-off process while laminating the metallized film 10 wound in a roll shape will be described.
First, the roll-shaped metallized film 10 shown in FIG. 4 is set in the first supply unit 22 and the second supply unit 23 shown in FIG. The individual metallized films 10 fed out from both the supply units 22 and 23 are guided to the outer circumference of the winding drum 20 by adjusting the feeding direction by the respective intermediate rollers 22a and 23a. Moreover, both supply parts 22 and 23 are provided with intermediate rollers 22b and 23b for appropriately winding the metallized film 10 while pressing the metallized film 10 against the outer periphery of the drum 20. The intermediate rollers 22b and 23b are given a biasing force in a direction in which the metallized film 10 is pressed against the outer periphery of the drum 20. In addition, these metallized films 10 are wound around the outer periphery of the drum 20 several times, for example, by taking a spare allowance of a predetermined length on each feeding end portion side, so that the subsequent winding is properly performed. .
And

The outer shape of the drum 20 is a regular polygonal shape (regular hexagonal shape), and the metallized film 10 fed out from the first supply unit 22 and the second supply unit 23 is taken up at the opposite locations on the outer periphery. Is set to Further, these metallized films 10 are wound around the drum 20 in a state where the respective metal films 10B are on the front side and the respective blank portions 13 are positioned on the opposite sides.
Note that the outer shape of the drum 20 is not limited to a hexagonal shape, and may not necessarily be a regular polygonal shape.

  In the drum 20, a first electrode 26 and a second electrode 27 for performing a burn-off process are disposed on the downstream side of the portion where the metallized film 10 is wound from the first supply unit 22 and the second supply unit 23. ing. Both electrodes 26 and 27 are individually provided with plus electrodes 26a and 27a and minus electrodes 26b and 27b arranged at a predetermined distance. By energization between these plus electrodes 26a, 27a and minus electrodes 26b, 27b, the metal film 10B of the metallized film 10 is melted and removed at the locations where the minus electrodes 26b, 27b are in contact.

By continuously rotating the drum 20 around the axis in the direction of the arrow in FIG. 5, the metallized film 10 fed from the first supply unit 22 and the second supply unit 23 is wound on the outer peripheral surface of the drum 20. In parallel with this, energization between the positive electrodes 26a, 27a and the negative electrodes 26b, 27b in the first electrode 26 and the second electrode 27 is performed at a predetermined timing. As a result, the burn-off process is sequentially performed on the metallized film 10 that has been fed from both the supply units 22 and 23 and wound around the outer periphery of the drum 20 within a predetermined range including the polygonal apex of the drum 20. In this range, the metal film 10B is melted and removed. Each removal range S shown in FIG. 7 is a portion where the metal film 10B is melted and removed by the burn-off process.
FIG. 7 exaggerates the thickness of the metallized film 10 for the purpose of clearly showing the state of the burn-off process. However, since the actual thickness of the metallized film 10 is thin, it follows the outer periphery of the drum 20. It is wound in a shape close to a hexagonal shape.

One means for setting the burn-off timing will be described taking the first electrode 26 as an example. A detection signal from the optical sensor 29 is transmitted to the control device 28 shown in FIG. The optical sensor 29 detects light from a plurality of light projecting units 21 provided at regular intervals along the outer periphery of the drum 20 at regular timing. Based on the detection signal from the optical sensor 29, the control device 28 performs energization between the positive electrode 26 a and the negative electrode 26 b of the first electrode 26 to perform burn-off on the metallized film 10. Therefore, the length of the removal range S from which the metal film 10B of the metallized film 10 is removed, or the start point and end point of the removal range S are mainly between the plus electrode 26a and the minus electrode 26b by the control device 28. Adjustment can be made according to the energization time or the timing of energization.
For the second electrode 27 (not shown in FIG. 6), the burn-off timing is set in the same manner as described above using a dedicated control device and an optical sensor.

  Each removal range S in which the metal film 10 </ b> B is melted and removed by the burn-off process is a range before and after the polygonal vertex of the drum 20. Since these removal ranges S are corners of the metallized film 10 and cannot be used as the capacitor element 12, the removal range S is a place where it is planned to be removed by cutting the metallized film 10 in the next step. is there. After each removal range S is cut and removed, the capacitor element 12 is formed only by the flat metallized film 10 laminated on the flat outer periphery of the drum 20.

As described above, the individual metallized films 10 fed out from the first supply unit 22 and the second supply unit 23 are wound around the drum 20 in a state where they are overlapped without shifting the position of the removal range S by the burn-off process. That is, the lamination of the metallized film 10 and the burn-off process are performed in parallel. And if the metallized film 10 is wound up to the predetermined lamination | stacking state on the outer periphery of the drum 20, after removing this metallized film 10 around the drum 20 or removing from the drum 20, each removal range S The capacitor element 12 is formed by cutting at a location by laser cutting or the like. As a result, the capacitor element 12 is formed only by the metallized film 10 laminated on the flat outer periphery of the drum 20 as described above.
Further, by cutting the laminated metallized film 10 at each removal range S, the insulation distance of the metal film 10B on the laminated cut surface 12b of the capacitor element 12 is sufficiently secured. When the metallized film 10 is cut and laminated before the burning process, the metal film 10B may wrap around the laminated cut surface 12b and be exposed like burrs, making subsequent burning process difficult. However, such a problem can also be avoided.

5 to 7, the metallized film 10 fed out from two directions is wound around the drum 20 and laminated, but as shown in FIG. It is also possible to pay out from the direction. In FIG. 8, the roll-shaped metallized film 10 is set in the third supply unit 30 and the fourth supply unit 31 in addition to the first supply unit 22 and the second supply unit 23. Also in the metallized film 10 fed out from the third supply unit 30 and the fourth supply unit 31, the feeding direction is adjusted by the intermediate rollers 30a and 31a and guided to the outer periphery of the winding drum 20, respectively. . The third supply unit 30 and the fourth supply unit 31 also include intermediate rollers 30 b and 31 b for appropriately winding the metallized film 10 against the outer periphery of the drum 20.
In addition, as for the metallized film 10 drawn | fed out from the 1st supply part 22-the 4th supply part 31, the blank part 13 of each metal film 10B is the 1st supply part 22, the 3rd supply part 30, the 2nd supply part 23, The fourth supply unit 31 is wound around the drum 20 while being alternately positioned on the opposite side.

  In FIG. 8, in addition to the first electrode 26 and the second electrode 27, the third electrode 34 and the fourth electrode for performing a burn-off process on the metallized film 10 fed out from the third supply unit 30 and the fourth supply unit 31. An electrode 35 is disposed. Both of these electrodes 34 and 35 are individually provided with plus electrodes 34a and 35a and minus electrodes 34b and 35b arranged at a predetermined distance. By energization between these plus electrodes 34a, 35a and minus electrodes 34b, 35b, the metal film 10B of the metallized film 10 is melted and removed at the locations where the minus electrodes 34b, 35b are in contact.

  In the configuration shown in FIG. 8, four metallized films 10 are each wound on a drum 20, and the lamination of the metallized films 10 and the burn-off process are performed in parallel. Therefore, these operations are performed at twice the efficiency as shown in FIGS. The laminated metallized film 10 is cut at the burn-off process location, that is, at the same location as each removal range S in FIG. The capacitor element 12 is formed only by the metallized film 10 thus formed.

DESCRIPTION OF SYMBOLS 10 Metallized film 10A Film film 10B Metal film 12 Capacitor element 20 Polygonal drum

Claims (4)

A method of manufacturing a laminated film capacitor in which a capacitor element is formed by laminating a metallized film having a metal film deposited on one side of a film film,
The metallized film is continuously wound on the outer periphery of a drum having a polygonal outer shape, and the metallized film located within a predetermined range including the vertex of the polygon in this drum is burned off to remove the metal film. Thereafter, the metallized film is cut within a range in which the metal film is removed by the burn-off process. A method for producing a laminated film capacitor according to claim 1,
A method for producing a laminated film capacitor, wherein a drum having an outer shape of a regular polygon is used and a metallized film is continuously wound around the outer periphery of the drum. A method for producing a laminated film capacitor according to claim 1 or 2,
A method of manufacturing a laminated film capacitor, wherein a metallized film is individually fed and wound around a plurality of locations on the outer periphery of the drum. A method for producing a laminated film capacitor according to claim 1, 2 or 3,
A method for producing a laminated film capacitor, wherein the metallized film after the burn-off treatment is cut while being wound on a drum.

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