JPS61267661A - Winding method for ultra-thin film - Google Patents

Abstract

PURPOSE:To prevent producing wrincles and breakage of a very thin film while preventing a stretch owing to a pulling force at a minimum, by winding the very thin film and stripping off the supporting film while pressing the laminated film with pressure rolls. CONSTITUTION:The first laminated film 9A is run from one side of the opposite sides of a winding axis 10 in the direction of the left tangent, and wound around the winder up to the point of winding angle theta from a line combining the winding start S and the center of the winding axis 10, where a pressure roll 11 is applied to press the film. From the point of the pressure roll 11, the supporting film 8a is stripped off to run to the right, and a one-side metalized film 7a only is wound. The second laminated film 9B is run from the other opposite side of the winding axis 10 in the direction of the right tangent, and wound around the winder up to the point of winding angle theta' where another pressure roll 12 is arranged symmetrically to the pressure roll 11, from where the supporting film 8b is stripped off to run to the left, and a one-side metalized film 7b only is wound, being wound together with the one-side metalized film 7a on the axis 10.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to methods for manufacturing ultra-thin films used in manufacturing wound film capacitors and the like.

(Prior Art) As electronic devices become smaller, capacitors, which are one of the electronic components incorporated into these devices, also become smaller and more sophisticated.

One way to downsize a capacitor is to make the metal film M8i and the dielectric film as thin as possible.

For example, when manufacturing a rolled single-sided metallized film capacitor in which an electrode and a dielectric are integrated, as shown in FIG. 1 AI! Two single-sided metallized films 1B are provided, the first single-sided metalized film 1A is wound from one opposite side of the winding shaft 2, and the second single-sided metalized film 1B is wound from the other opposite side of the winding shaft 2. The removed capacitor element 3 consisting of a cylindrical winding was heated and pressurized to form it into a flat shape, and then metal was sprayed on both ends to form a JJ-shaped single-sided metal-molded film capacitor. .

In this case, in order to further downsize the capacitor,
When using an ultra-thin film with a thickness of 10 microns or less, the film stretches due to the tensile force that acts on the film during winding.
This elongation causes wrinkles in the film. For this reason, the winding is performed at a relatively slow speed in order to prevent wrinkles as much as possible, resulting in a problem of poor productivity.

Furthermore, when winding a film with a thickness of several microns or less in order to downsize a capacitor, the film cannot withstand the tensile force during winding even if the winding speed is slowed down. The film stretches and wrinkles, and sometimes the film breaks due to the tensile force.

When a capacitor is formed by winding a wrinkled film, the withstand voltage is reduced, and the characteristics and reliability of the capacitor are significantly reduced.

Therefore, as shown in FIG.
A, the second single-sided metallized film 1B is laminated with the support film 4A and 48 km of each, respectively, to form a Wi layer film 5A.
, 5B, and these laminated films 5A and 5B are placed at the winding start point of the winding shaft 2, and the first single-sided metalized film 1A, the second single-sided metalized film 1B, and the supporting film 4A.

4B is peeled off, and the first single-sided metallized film 1A is obtained.

A means for winding the second single-sided metallized film 1B is disclosed in Japanese Patent Publication No. 52-5700@.

According to such means, the elongation due to tensile force is relatively small, but in the case of an extremely thin single-sided metalized film that has a small tensile modulus and is easily elongated, after peeling off the support film,
Even when a slight tensile force is applied, wrinkles occur, which inevitably deteriorates the characteristics and reliability of the capacitor.

(Problems to be Solved by the Invention) The present invention attempts to solve the problem that wrinkles occur due to elongation due to tensile force when winding an ultra-thin film.

(Means for Solving the Problems) The present invention is a winding means that prevents the elongation due to tensile force as much as possible when winding an ultra-thin film, thereby preventing wrinkles and breakage. It is a film that can be wound with high performance such as capacitor film that has good performance and high reliability. An ultra-thin film winding method is provided, characterized in that the ultra-thin film is wound by peeling off the supporting film while pressing the laminated film with a pressure roll.

Although the ultra-thin film used in the present invention is not particularly limited, a typical example is a plastic film. Polyethylene, polypropylene, polymethylpentene, polyacetal, vinylidene cyanide, polyvinylidene fluoride, polyvinyl fluoride, polyethylene terephthalate, polycarbonate, polysulfone, polyarylate, polyetheretherketone, polyethersalvon, polyamide, etc. as resins for ultra-thin films. Examples include polyimides, copolymers thereof, and mixtures thereof, as well as materials obtained by mixing these resins with dielectric fine powders such as barium titanate, lead titanate, and lead zirconate titanate.

Further, the ultrathin film can be formed by a melt extrusion method, a casting method in which the film is dissolved in a solvent, etc., but it goes without saying that other molding methods may also be used.

Furthermore, in the present invention, in order to create a state in which the ultra-thin film and the support film are layered, if the ultra-thin film is a plastic film, the ultra-thin film and the support film may be laminated in a molten state by co-extrusion. , and then laminated in a molten state, a metal film may be vacuum-deposited on an ultra-thin plastic film to produce an ultra-thin film with metallization on one side, or the ultra-thin film and support film may be formed in separate processes and then laminated. Alternatively, it may be vacuum-deposited into an ultra-thin film and then laminated with a support film to form an ultra-thin film with metallization on one side.

Furthermore, if the ultra-thin plastic film is a double-sided metallized film, it may be laminated with a supporting film after vacuum steaming on both sides.

Furthermore, the support film in the present invention is typically a plastic film. If both the ultra-thin film and the support film are plastic films, they may be made of the same type of resin or may be made of different types of resin. When forming the vI layer in a molten state by coextrusion, it is necessary to select different types of resins so that the ultrathin film and support film can be easily separated during winding.

For example, when the resin of the ultra-thin plastic film is polyvinylidene fluoride, polyethylene, polypropylene polystyrene, etc. are suitable as the support film, and when the resin of the ultra-thin plastic film is polypropylene, the support film is polyvinylidene fluoride. Vinylidene, polystyrene, polyethylene terephthalate, polycarbonate, etc. are suitable.

The present invention is suitable for application to ultra-thin films that are easily stretched by tensile force or ultra-thin plastic films with a thickness of 5 microns or less, and roughly conforms to JIS K-7113.
The tensile modulus in the winding direction measured by
It is particularly effective for ultrathin plastic films that are easily stretched by so-called tensile forces of less than /cm''.

In the present invention, vapor deposition refers to vacuum vapor deposition, sputtering,
It shall be understood in a broad sense, including ion brating, etc.

The metals to be deposited include aluminum, antimony, arsenic, barium, bismuth, calcium, cadmium, carbon, chromium, cobalt, germanium, gold, indium, iridium, iron, lead, magnesium, manganese, molybdenum, and nickel. , platinum, selenium, silicon,
Silver, tellurium, tin, titanium, zinc, zirconium, yttrium, beryllium, cerium, tantalum, thorium, lithium and compounds thereof can be used.

(Example) An embodiment of the invention will be described with reference to FIG.

Polyvinylidene fluoride (KYNAR manufactured by Benwalt)
Co-extrude polypropylene (Mitsubishi Yuka Noprene (FF registered trademark)) on both sides of the
Then, after uniaxially stretching 5 times at 125°C, while peeling off the polypropylene on one side, the tensile modulus in the flow direction was 25000 as measured by JIS K-7113 to 9/c.
The 81m film is made by laminating an ultra-thin film 7 of 1 micron thick made of polyvinylidene fluoride with a polyvinylidene fluoride having a polyvinylidene fluoride and a supporting film 8 of 15 micron thick made of polypropylene. After forming aluminum M!lyA with a thickness of 300.A and metallizing one side, it was cut into a slit shape with a width of 10 seconds.
+s.

The ultra-thin film 7 is a metalized film on one side with a margin width of 0.81I.

A first laminated film 9A and a second laminated film W, which are made of the laminated film 9 and are wound around an unwinding shaft (not shown), respectively.
The Am film 9B is wound around the winding shaft 10 as shown in the first figure.

That is, the 181st layer film 9A is run on the opposite side of the winding shaft 10 from the left tangential direction and is attached to the straight line (α) connecting the winding start point (A) and the center of the winding shaft 10. The pressure roll 11 presses down at the point where it has been rotated by the required angle (θ), and the support film 8a is peeled off at this pressure roll 11 and run to the right, only the single-sided metallized film 7a is wound, and the second laminated film is formed. 9B is run from the right tangential direction to the opposite side of the winding shaft 10, and is rotated by a required angle (θ'), and the support film 8b is peeled off at the pressure roll 12 portion arranged symmetrically with the pressure roll 11. The single-sided metallized film 7b is wound together with the single-sided metalized film 7a wound around the winding shaft 10, and when the required amount of winding is reached, the wound object is removed from the winding shaft 10. The capacitor element 13 was obtained by heating and pressurizing it to make it flat.

In this case, the 18th i-layer film 9A that rotates the winding shaft 9 and the second
The introduction running state of the laminated film 9B is parallel, and the peeling running direction state of the support films 3a and 8b is parallel.

In the capacitor element 13 thus obtained, no wrinkles or irregularities in the end surfaces were observed.

In this way, in order to prevent the single-sided metallized films 7a and 7b from elongating and from forming wrinkles, it is important to peel off the support film after turning the laminated film at a required angle with respect to the winding shaft 10. The required angles (θ) and (θ') are often 0° and θ≦90'', Q'<θ'≦90', 5°≦θ≦45°, and 5°≦θ'≦45, respectively. It is suitable to set it to ゜.

Further, as shown in FIG. 2, the first laminated film 9A and the second laminated film 9B are each placed on a pressure roll 1 at the starting point where they contact the capacitor element 13 which is already wound.
4.15 gives good results in the case of relatively slippery and very thin films.

Furthermore, in the case of double-sided metallized ultra-thin films, the third
As shown in the figure, both sides are metallized! A 1iIm film 18 consisting of an iW1 film 16 and a support film 17 is attached at the same time to the laminated film 19, and when it passes through a pressure roll 20, the support film 17 is peeled off, and the laminated film 19 and the double-sided metalized ultra-thin film 16 are bonded together. A rolled double-sided metallized film capacitor can be obtained by winding.

Furthermore, as shown in FIG. 4, when an electrode foil such as aluminum and an unmetallized ultra-thin film are simultaneously wound to form a winding film capacitor, electrode foils 21 and 22, Ultra-thin film 23a that is not metallized.

23b and the support films 24a, 24b, the laminated films 25a, 25b are simultaneously attached to the pressure roll 26.
After passing through the support films 24a and 27, respectively.
24b may be peeled off.

(Effects of the Invention) The present invention is capable of winding an ultra-thin film that is easily stretched by tensile force with as little stretching as possible and preventing the occurrence of wrinkles. By applying it to manufacturing, a capacitor with good characteristics and great reliability can be obtained.

Furthermore, since the present invention winds the support film and the ultra-thin film in a laminated state, it is possible to prevent the ultra-thin film from elongating due to tensile force, thereby enabling high-speed winding and significantly improving productivity. be able to.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of the case where the present invention is applied to the winding of an ultra-thin film metallized on one side, Fig. 2 is a schematic explanatory diagram of the same/another means, and Fig. 3 is a schematic explanatory diagram of the case where the present invention is applied to the winding of an ultra-thin film with metallization on both sides. A schematic explanatory diagram when the present invention is applied to the winding of a thin film, FIG. FIG. 6 is a schematic explanatory diagram of a conventional method using a support film. 7...Ultra-thin film, 7a, 7b...Single-sided metallized film, 8.8a, ab...Supporting film, 9A.
...first laminated film, 9B...second laminated film,
10... Winding shaft, 11.12... Pressure roll. Patent applicant Mitsubishi Yuka Co., Ltd. Director No. 3 Tsuna 4 Tsuimo 5 Figure/A Vines 6 Figure

Claims (1)

[Claims] An ultra-thin product characterized in that a laminated film of an ultra-thin film and a support film is wound around an unwinding shaft, and the support film is peeled off while pressing the laminated film with a pressure roll to wind the ultra-thin film. Film winding method.