JPS584820Y2 - sealed metal cans - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sealed metal can suitable for moisture-proof packaging.

The purpose of this invention is to provide a metal can that uses a gas-impermeable thin film that can be easily cut and opened, and that can be evenly stretched and sealed, and that can be resealed after opening. It's about doing.

An embodiment of the present invention will be described with reference to the drawings. A short cylindrical member 3 whose lower end opening is covered with a thin film 2 and whose end edges are thermally bonded.
The upper part 4 of the member 3 is folded outward and sealed, and the lower part of the member 3 is suspended apart from the main body of the can.

In the figure, 5 indicates an inner lid, and 6 indicates an outer lid.

The can body has a body 1 for fitting the outer lid 6 above the annular bulge 9.
0 and a small-diameter seaming base 11 that is connected above the seam and has a narrowed diameter so that the outer side 12 of the seamed part after seaming does not protrude outside of the fitting body part 10 of the outer lid.

The short cylindrical member 3 has a seaming base abutting part 13 which is the inside of the seaming part.
It has a small diameter part which is connected to the lower part of the contact part 13 and whose diameter is narrower than the contact part 13, and the lower end of the small diameter part is curled to form a winding strip 7.

A gas-impermeable thin film 2 is provided at the lower end opening of the qqa member 3ρ with a small diameter.
is covered and folded back against the edge of the winding 7, and the edge of the thin film is thermally bonded to the outer surface of the small diameter portion.

Above the contact part 13 of the short cylindrical member 3 is the seaming base 1 of the can body.
1, and an inner lid can be fitted inside the contact part 13, and an outer lid 6 can be fitted to the outside 12 of the seamed part and the fitting body part 10, respectively.

For the thin film 2, a gas-impermeable material such as aluminum foil, a synthetic resin film such as polyethylene or vinyl chloride, or paper coated with a synthetic resin is used, and the upper surface of the material is coated with varnish if necessary. It is possible to apply a coating such as a heat-sensitive adhesive on the lower surface.

A winding strip 7 is formed at the lower end of the short cylindrical member 3, and the thin film 2 is placed over the opening at the lower end, and the winding wire is smoothly folded back and thermally bonded to the outer surface of the small diameter portion. It is possible to achieve reliable adhesion with good airtightness and no risk of peeling in a uniformly tensioned state, without any problems when fitting the member 3, and without being affected by the inner lid. Even if 5 is stored, it will not affect the thin film.

Although the above-described winding strip 7 is not shown in the drawings due to the structure of the present invention, as long as it can be inserted into the inside of the winding base of the can body without any trouble and the thin film 2 is held without coming into contact with the can body, the third winding strip 7 can be used. It may also be formed outward, contrary to the curling direction shown in FIGS.

In that case, the entire edge of the thin film 2 will be thermally bonded along the winding strip 7, but at least the folded upper end of the thin film 2 will be thermally bonded on the outer surface of the small diameter part and will not reach the seaming part. It is necessary.

In addition, in carrying out the present invention, when the upper part 4 of the short cylindrical member 3 is folded outward and tightened, a soft elastic material 8 such as synthetic resin or rubber is placed between it and the opening of the can body 1. By interposing the can body 1, even if the can body 1 has a side seam, it can be airtightly sealed.

As described above, the present invention has a small diameter part on the inside of the opening of the can body 1, which is smaller in diameter than the contact part on the inside of the seaming part, and the outer surface of the part is covered with a gas-impermeable thin film 2. The heat-bonded short cylindrical member 3 can be fitted easily and without affecting the thin film □5, and the upper part 4 of the member 3 is folded back □ outward and tightened, making it easy to fit. In addition to providing good adhesion, the thin film 2 can be easily torn and opened without using tools such as a can cutter.

□Furthermore, according to the present invention, even if the inner lid 5 is attached to the seaming base contact portion 13 before opening,
This does not directly affect the thin film, and it is also possible to reseal the container by inserting the inner lid 5 after opening.

The feature of the present invention is that the lower part of the short cylindrical member 3 is covered and thermally bonded in advance with a thin film 2.

A conventional technical idea is to sandwich a thin film between the opening of the can body and the short cylindrical part Tht and then tighten the upper part. The thin film was damaged by the impact, and the damage tended to be particularly severe at the protruding parts of the side seams of the can body.

In the sealed metal can according to the present invention, the thin film 2 is covered and thermally bonded to the smooth surface of the lower part of the short cylindrical member held in the can body by fitting and seaming, and the short cylindrical member is held isolated from the can body. When tightening a shaped member, or even if the tightening reserve main body receives an unexpected impact, the constriction and small diameter section below the contact surface of the tightening base of the short cylindrical member will buffer, preventing tearing and damage of the thin film, and preventing damage to the thin film. The above-mentioned drawbacks of the prior art were able to be overcome.

In addition, the thin film is tensioned uniformly by the winding edge at the lower end of the small diameter of the short cylindrical member, and is folded back smoothly to ensure thermal bonding, improving the airtightness of the can body. In addition, since the opening end has a curl, there is no risk of injury to hands or fingers caused by sharp cuts when opening the can.

Further, above the can body, a small diameter seam base part is tightened so that the seam part with the short cylindrical member does not protrude outward from the fitting body part above the can body, The outer lid can be easily attached and removed without being obstructed by the seaming part, and by making the outer diameter of the insertion body and the seaming part the same, the contact area increases and sealing performance is improved. Further, even if the inner lid 5 is attached to the inner surface of the abutting part of the seamed base before opening, it will not be inserted too much due to the constriction step of the small diameter part covered with a thin film and thermally bonded. Therefore, it can be stored securely without affecting the thin film□.

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[Brief explanation of the drawing]

The drawings show an example of the sealed metal can according to the main proposal, and Fig. 1 is a perspective view, Fig. 2 (± exploded explanatory drawing, Fig. 3 is an enlarged explanatory view of the main parts, and Fig. '4 is a structure. It is an explanatory diagram of 1...can body, 2... thin film, 3...
... Short □ cylindrical member, 4 ... Above the short cylindrical member, 5 ... Inner lid, 6 ... External lid, 7 ...
... windings, 8 ... soft elastic material, 9 ...
...Annular bulging part, 10...Body part for fitting, 11.
...Pa... Sealing base, 12...Outside of the seaming part,
13... Sealing base contact part.

Claims (1)

[Scope of utility model registration request] This is a thick umbrella can in which a short cylindrical member is fitted inside the opening of the can body, and the upper part is folded back to the outside and rolled up. A small-diameter seaming base with a narrowed diameter so as not to protrude from the outside of the body for fitting the lid is formed in advance, and the seaming base abutting portion and the abutting portion on the inside of the seaming portion are strained. The diameter is narrowed down from the abutting part, and a coil is formed at the lower end. A sealed metal can in which a small diameter part of the short cylindrical member is held separate from the can main body by fitting a short cylindrical member and tightening it together with the seaming base.