JPH0245373A - Method for wrapping electronic part - Google Patents

Abstract

PURPOSE:To enable a large amount of a vacuumizing or reducing work at a time after contents are sealed by a method wherein a package is constituted of a flat cylindrical body made of a film and at least one film-shaped valve having an opening function provided at one end of said body. CONSTITUTION:A package 1 made of a moisture-proof film material is made into a tube shape having an upper wall 11 and a lower wall 12 with one end open 13 and the other end heat-sealed 14. A nonreturn valve 2 provided between the upper wall 11 and the lower wall 12 of the heat seal 14 is installed so that the tip 23 of film-like valve 22 to be constituted faces outward. The nonreturn valve 2 consists of a flat cylindrical body 21 formed by a plastic film excellent in flexibility and at least one film-shaped valve 22 provided inside said body 21. The tip 23 of the valve 22 is equipped with an opening, the other end and both sides are welded 24 on the cylindrical body 21, and a slit 3 is formed on the interface between the inner face A of the cylindrical body 21 and the surface B of the valve 22 to allow air to flow. A nonreturn valve 4 is installed so that the tip 23 of the film-shaped valve 22 faces inward to allow inactive gas or the like to flow into the package 1 via the slit 3.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a packaging method for electronic components, and more specifically, it is suitable for moisture-proof packaging and transportation of electronic components used in semiconductor packages, etc. The present invention relates to a packaging method that allows easy vacuum or reduced pressure work and maintains a vacuum or reduced pressure state for a long period of time.

<Prior Art and its Problems> Conventionally, in packaging, transporting, etc. electronic components, the occurrence of cracks due to contact of electronic components with moisture or air has been considered to be a drawback.

As a means to prevent such racking, the product was placed in a bag coated with metal to prevent moisture from passing through, along with a desiccant such as silica gel, and packaged in moisture-proof packaging.

However, with this method, cracks can be prevented if the packaged electronic component is used immediately after opening.

However, although users can always use up all of the moisture-proof packaged electronic components after opening them, some fraction remains, and these remaining products must be dried before being mounted.

Means for Solving the Problems> This invention was developed to solve the above problems, and allows electronic parts to be packaged and transported without worrying about cracking, and also enables vacuum operations to be carried out in large quantities at once. The purpose of this invention is to provide a packaging method that can be used.

That is, the present invention is composed of a flat cylindrical body made of film and at least one film-shaped valve body installed on one end side of the cylindrical body so as to have an opening function, and the inner surface of the cylindrical body and the valve body are connected to each other. A check valve whose interface with the body surface is gas-permeable is made of a film-like material having at least moisture-proofing properties, and is placed in a container having an opening, with the tip of the film-like valve body facing outward or inward. The present invention provides a packaging method for electronic components, characterized in that the electronic components are sealed from the front end of the container, and the air inside the container is degassed or replaced with an inert gas.

In the above configuration, when the container is placed under reduced pressure after enclosing electronic components, the air inside the container flows through the film-made flat cylindrical shape of the check valve, which is attached with the film-shaped valve body tip facing outward. Air is removed through the interface between the inner surface of the body and the surface of the film-like valve body. After degassing, when the container is exposed to the atmosphere, the container tries to take in the air, but at this time, due to the air intake force inside the container,
The inner surface of the cylindrical body and the valve body surface are in close contact with each other to prevent atmospheric air from being taken in, thereby maintaining a vacuum or reduced pressure state.

However, if the air in the container is not completely exhausted by this deaeration and even a small amount remains, there is a risk that the electronic components sealed in the container will be contaminated by the residual air and the quality will deteriorate. In that case, it is preferable to introduce an inert gas into the container using the check valve 4 installed with the tip of the film-like valve element facing inward, and to replace the remaining air with this inert gas.

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

In FIGS. 1A, B, and C, reference numeral 1 denotes a container made of at least a moisture-proof film-like material alone or a laminate thereof, and is shown in the form of a tube having an upper wall 11 and a lower wall 12. An opening 13 is formed at one end, and an upper wall 11 and a lower wall 12 are heat-bonded and heat-sealed 14 at the other end, but this shape is not particularly limited. Reference numeral 2 denotes a check valve provided between the upper wall 11 and the lower wall 12 of the heat seal 14, and the valve 2 is a check valve disposed between the upper wall 11 and the lower wall 12 of the heat seal 14, and the valve 2 is connected to the tip 23 of the film-like valve 22 constituting the valve 2, as described in detail below. is container 1
It is installed facing outward against the

The check valve 2 has a flat cylindrical body 21 made of a highly flexible plastic film such as polyethylene film.
and at least one film-like valve body 22 installed inside the cylindrical body 21.
The tip 23 has an open part, and the other end and both sides are fused 24 to the flat cylindrical body 21, and a gap 3 is formed at the interface between the inner surface of the cylindrical body 21 and the surface opening of the valve body 22. It is configured to allow air to circulate within the container 1 through the gap 3.

Further, 4 is a check valve provided between the upper wall 11 and the lower wall 12 of the heat seal 14, and as is clear from FIG. Destination @2
3 is attached to the container 1 facing inward, allowing inert gas, etc. to flow into the container 1 through the gap 3.

In the packaging container configured as described above and used in the method of the present invention, electronic components are inserted through the opening 13 of the container 1, and the opening 13 is sealed using a known adhesive means such as heat sealing.

The container containing the electronic components in this manner is placed under reduced pressure in a reduced pressure chamber or the like. As the air in the container 1 is reduced in pressure, it is degassed through the gap 3 between the inner surface of the cylindrical body 21 of the check valve 2 and the surface opening of the valve body 22. When the container is exposed to the atmosphere after deaeration, the container 1 tries to take in the air through the check valve 2, but at this time, as shown in the first diagram, the air intake force inside the container causes the cylindrical body 21 to The inner surface A of the valve body 22 and the surface opening of the valve body 22 are in close contact with each other to prevent atmospheric air from being taken in, creating a vacuum state.

Since the inside of the container is in a vacuum state in this way, the state of close contact between the inner surface of the cylindrical body 21 and the surface opening of the valve body 22 is maintained for a long period of time, and the vacuum state is maintained semi-permanently. It is something to do.

However, if there is any residual air in the container, the fourth
The remaining air may be exchanged by sending inert gas into the container using the check valve 4 shown in the figure.

FIG. 2 shows another embodiment of the present invention, in which the cylindrical body 2
The film-shaped valve body 22a provided inside the valve body 1 is made of a plastic film folded in two as shown in the figure, and both sides are fused 24a to the cylindrical body 21. In the case of this valve body 22a, the air inside the container 1 flows through the gap formed between the inner surface of the cylindrical body 21 and the outer surface of the valve body 22a by exposing the container 1 to reduced pressure. (
After the deaeration is completed, the inner surface of the cylindrical body and the outer surface of the valve body are brought into close contact with each other due to the air intake force in the container, and the valve body 22a is exposed to the atmosphere. The folds prevent air from entering and maintain a vacuum state.

In FIG. 3, a plurality of film-like valve bodies 22 (two in the figure) are provided, which improves the reliability of maintaining the vacuum state.

In addition, when slightly degassing the air, etc., gradually peel off the adhesive peeling piece 6 pasted on the hole 5 made in the upper wall 11 of the container 1 in advance as shown in FIG. 1A. It may be carried out by

<Effects of the Invention> As explained above, according to the packaging method of the present invention, the vacuum operation is characterized in that a large amount of vacuum or depressurization work is performed every time the contents are sealed in the container. Further, since a good vacuum condition can be maintained for a long period of time, there is an advantage that electronic components can be stored for a long period of time without fear of contamination or cranking.

[Brief explanation of the drawing]

FIG. 1A is a perspective view showing an embodiment of the present invention, FIG. 1B is a sectional view taken along line II' in FIG. 1A, FIG. 1C is a partial plan view of FIG. 1A, and FIG. FIG. 1A is an explanatory cross-sectional view taken along the line I-I' when the contents are filled and vacuum packaged, FIG. 2 is a partial plan view showing another embodiment of the present invention, and FIG. A sectional view showing an example of the check valve used, FIG. 4 is similar to FIG. 1A.
It is a cross-sectional view along ■-■. 1... Container 2.4... Check valve 21... Film flat cylindrical body 22. 22a... Film-shaped valve body

Claims (1)

[Claims] It is composed of a flat cylindrical body made of film and at least one film-shaped valve body installed on one end side of the cylindrical body so as to have an opening function, and the interface between the inner surface of the cylindrical body and the face of the valve body is A gas-permeable check valve is attached to a container made of a film-like material having at least moisture-proofing properties and having an opening, with the tip of the film-shaped valve body facing outward or inward, and the opening of the container A method for packaging electronic components, which comprises: enclosing electronic components from the inside of the container, and deaerating the air in the container or replacing the air with an inert gas.