JP3186206B2 - Outer container for electronic components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an outer container for electronic parts. More specifically, the present invention relates to an outer container for electronic components in which a specific resin layer is provided on an outer surface of a bottomed cylindrical container body made of an aluminum plate. In particular, a container which can be suitably used as an outer container such as an aluminum electrolytic capacitor having a short lead wire and directly contacting a printed circuit board on a capacitor body, and a horizontal type aluminum electrolytic capacitor having a side surface portion of the capacitor body also directly contacting the board. The present invention relates to an outer container for electronic components having excellent adhesiveness and heat resistance between a main body and a resin layer.

[0002]

2. Description of the Related Art An outer container for accommodating a capacitor element constituting an aluminum electrolytic capacitor is usually a bottomed cylindrical container obtained by drawing an aluminum plate, and is used to identify the type of the capacitor element. To
A container is used in which the outer surface of a container is colored with various coloring agents and further covered with a shrink tube on which a symbol or the like is printed.

In recent years, the size of electronic components mounted on a printed circuit board has been reduced, and aluminum electrolytic capacitors have also tended to be reduced in size. In order to reduce the space between the printed circuit board and the capacitor (reduce the height) by contacting the printed circuit board, and to eliminate wasteful space, high-density mounting is being studied. Similarly, for the purpose of high-density mounting, a so-called horizontal type aluminum electrolytic capacitor in which the side surface of the capacitor body directly contacts the surface of the wiring board has been studied.

In the case of a small-sized aluminum electrolytic capacitor having a reduced height, when a conventionally used shrink tube made of, for example, a polyvinyl chloride resin is used as a coating material for the outer periphery of the capacitor outer container, the coating material is printed. If the solder temperature is too high when soldering to the printed wiring board surface by the reflow method because it is in direct contact with the wiring board, it is easily affected by the solder temperature, and the printed shrink tubing coated There has been a problem that the contacting part is thermally deteriorated or melted.

[0005] In addition, it has been studied to prepare a capacitor exterior container by drawing using a resin-coated laminate in which one surface of an aluminum plate is coated with resin without using the above-mentioned shrinkable tube. As described above, a problem of thermal deterioration occurs as described above, and a solution to this problem has been desired.

[0006]

The object of the present invention is as follows. 1. To provide an outer container for electronic parts having excellent heat resistance. 2. Provided is an outer container for electronic parts having excellent adhesion at an interface between an aluminum plate and a coating resin layer.

[0007]

In order to solve the above-mentioned problems, according to the present invention, one surface of an aluminum plate has a melting point of 2%.
A resin-coated aluminum plate coated with a polyester resin having a temperature of 40 ° C. or higher is drawn so that the polyester resin layer becomes an outer surface, and after the drawing, the melting start temperature of the polyester resin to the heating loss is 1%.
Provided is an outer container for electronic parts, which is heat-treated in a temperature range of 0% or less.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The outer container for electronic components according to the present invention is formed by coating one surface of an aluminum plate with a specific resin. Examples of the aluminum plate include a pure aluminum plate and an aluminum alloy plate. The thickness of the aluminum plate is preferably 0.2 to 0.5 mm and about 0.3 mm because it is difficult to draw when the aluminum plate is too thin or too thick.

One side of the aluminum plate has a melting point of 24
It is coated with a polyester resin at 0 ° C. or higher.
Polyester resin is placed on the outer surface of the outer casing for electronic components, and to identify the type of capacitor element, etc.
Colored or symbols are printed. The modified polyolefin resin is disposed on the inner surface of the outer container for electronic components, and imparts insulation to the outer container for electronic components.

If the melting point of the polyester resin is less than 240, the heat resistance of the resin is too low, so that the object of the present invention cannot be achieved, which is not preferable. In the present invention, it means the melting point and the temperature of an endothermic peak measured by a differential scanning calorimeter (DSC). Specific polyester resins include polyethylene terephthalate, polyethylene naphthalate, poly-1,4-cyclohexane dimethylene terephthalate, and the like.

There are various methods for laminating the polyester resin on the surface of the aluminum plate.
(1) A melt lamination method in which a pre-formed polyester resin film is overlaid on an aluminum plate heated to a temperature equal to or higher than the melting point of the resin and pressure-bonded. And a dry laminating method of laminating on an aluminum plate through the above method. From the viewpoint of productivity, the former melt lamination method is preferred. The thickness of the polyester resin film is 10 to 1
The range of 00 μm, more preferably 10 to 50 μm, is preferable from the viewpoint of drawing and heat resistance.

In order to prepare an outer container for electronic parts from an aluminum plate having one surface coated with a specific polyester resin, an ordinary multi-stage drawing machine is used, and the polyester resin layer becomes an outer layer. What is necessary is just to draw. The resulting container is a bottomed cylindrical container.

The container obtained by drawing in this way is
The melting start temperature of the coated polyester resin is the lowest temperature,
The heat treatment is performed in a temperature range in which the temperature at which the weight loss on heating is 10% by weight or less is the maximum temperature. When the container obtained by drawing is heat-treated in this temperature range, the adhesion at the interface between the aluminum plate and the coated polyester resin layer can be significantly improved. The melting start temperature of the polyester resin is about 210 ° C., although there is a slight difference depending on the kind and molecular weight of the polyester resin.
00 ° C.

In the outer container for electronic parts according to the present invention, the polyester resin coating the aluminum plate has excellent heat resistance, so that the outer surface coating layer is exposed even when exposed to high temperatures during soldering. Since it is hard to deteriorate and insulation is maintained, the outer container for aluminum electrolytic capacitors where the lower part of the capacitor is in direct contact with the printed circuit board, and the outer container such as the horizontal type aluminum electrolytic capacitor where the side of the capacitor body contacts the wiring board Can be suitably used.

[0015]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to the following examples.

[Example] Aluminum plate (A1100P-H18, thickness 0.3 m)
m) A film made of polyethylene terephthalate (PET, melting point: 260 ° C.) having a thickness of 20 μm was laminated on one side of the method by a melt lamination method to obtain a PET-coated aluminum laminate.

The obtained PET-coated aluminum laminate is subjected to a 7-step drawing process using a lance progressive drawing die, and the outer surface is coated with PET and has a diameter of 10 mm and a height of 20 mm. It was created. The obtained bottomed cylindrical container is placed on a hot plate heated to 240 ° C. so that the top surface of the bottomed cylindrical container is in contact with the container, and a load of 100 g is applied from the top for 30 seconds to change the top surface portion. The condition was observed.

As a result, in the bottomed cylindrical container, no change was observed in the top surface portion of the container in contact with the hot plate. Further, when a practical test as an electrolytic capacitor was carried out by housing the capacitor element using the above-mentioned container, no problem was found in the container coated with polyethylene terephthalate as described above.

Comparative Example In the example described in the examples, the thickness of the laminated film was 20
μm polybutylene terephthalate (PBT, melting point 22
4 ° C.), and the same test as in the example was performed.
At the point of contact with the hot plate on the top surface of the bottomed cylindrical container, the laminated film melted and small holes were opened, and the diameter of the holes increased with time. This is because the melting point of PBT is 2
Hot press heated to 240 ° C because it is as low as 24 ° C
It was because the PBT film was melted on the substrate and a hole was formed, and the diameter of the hole was observed to increase rapidly.

[0020]

As described in detail above, the present invention has the following particularly advantageous effects, and its industrial value is extremely large. 1. Since the outer container for an electronic component according to the present invention has the outer surface covered with a specific polyester resin layer, the outer surface coating layer is hardly deteriorated even when exposed to high temperatures when performing soldering, and has an insulating property. Is excellent. 2. The outer container for electronic components according to the present invention has a polyester resin resin melting start temperature to heating loss of 1 after drawing.
Since the heat treatment is performed in a temperature range of 0% or less, the adhesiveness of the interface between the aluminum plate and the coating resin layer is excellent, and the interface is hardly peeled.

Claims (1)

(57) [Claims] 1. An aluminum plate having one surface having a melting point of 24
A resin-coated aluminum plate coated with a polyester resin at 0 ° C. or higher is drawn so that the polyester resin layer becomes the outer surface. After drawing, the melting start temperature of the polyester resin to the heat loss is reduced. 1
An outer container for electronic parts, which is heat-treated in a temperature range of 0% or less.