JP2837437B2 - Barrier container and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is intended for storing contents that do not like moisture or oxidation.
The present invention relates to a barrier container having gas barrier properties and a method for producing the same.

[Conventional technology]

2. Description of the Related Art In recent years, barrier containers made of an injection resin that is inexpensive and light and have high barrier properties against oxygen, water vapor, and the like, which replace metal cans such as tin cans and aluminum cans, have appeared.

As shown in FIG. 11, these containers are made of a barrier film sheet.
Cut the circular blanks 51 and 51 from the
A barrier film molded body 53 (FIG. 12) having substantially the same shape as the container is formed while forming the rising wall 52 while folding the periphery of the container, and this is set in the cavity of the male mold and the female mold for injection molding. A resin such as polypropylene (PP) is injected so that the barrier film molded body 53 is located inside the wall of the container.
(Fig. 13).

[Problems to be solved by the invention]

However, in this type of conventional barrier container, when forming the barrier film molded body 53, since the flat barrier film blank is formed while being folded, wrinkles are formed as shown in FIG. I will. For this reason, the wrinkles may cause pinholes, and only a shallow container can be manufactured. In addition, when printing on the container due to the wrinkles, the barrier film pre-printed could not be used, so printing was performed on the surface of the container, but there was a problem that such printing was easily peeled off. .

In view of the foregoing, an object of the present invention is to provide a deep-barrier container having no wrinkles and a method of manufacturing the same.

[Means for solving the problem]

Therefore, in the present invention, a bottomed cylindrical barrier formed by integrally forming a barrier container with a bottom formed in advance by a barrier film is combined with a bottom of a cylindrically formed barrier film having both ends opened. A container body that includes a film body as a part, and the barrier film body has a container body integrally formed with an injection resin so as to form a container inner surface, wherein the container body is formed by folding a folded portion of the barrier film. A flat bottom portion, a cylindrical side wall portion rising from around the bottom portion, and an expansion portion expanding outward from an end of an opening of the side wall portion, a method for manufacturing a barrier container,
A cylindrical barrier film having a bottom is integrally formed by combining a barrier film formed in a cylindrical shape with both ends opened and a bottom molded body formed in advance by the barrier film, and the bottom surface of the barrier film is formed around the bottom. After the portion extending downward from the inside is folded inward in the radial direction and welded, the barrier film body is put on a forming male mold, and the cavity is formed by combining the forming male mold and the forming female mold covered with the barrier film body. Then, a molding resin is injected into the cavity to integrally mold a container body having a circular flat bottom so that the barrier film body covers the inner surface of the container body.

[Action]

The barrier film formed into a cylindrical shape having a bottom portion formed by combining a barrier film formed into a cylindrical shape with both ends open and a bottom molded body is integrally molded with an injection resin. There is no danger. Therefore, it is possible to form a deep-bottomed container having excellent barrier properties without a risk of pinholes. In addition, by performing printing on the barrier film in advance, it is possible to perform printing without fear of peeling off the container.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a barrier container 1 according to the present invention. The barrier container 1 includes a container body 2 and a lid 3. The container body 2 is formed with a circular bottom 4, a cylindrical side wall 5 rising from the periphery of the bottom 4, and an expanding portion 6 expanding outward from the opening end of the side wall 5.

The bottom part 4, the side wall part 5, and the expanded part 6 of the container main body 1 are formed of a resin such as polypropylene (PP), polyethylene (PE), polyester, polycarbonate (PC), and polystyrene (PS).

Further, the inner surface of the container at the bottom portion 4, the side wall portion 5, and the expanding portion 6 of the container body 2 is formed of a barrier film having a barrier property against gas, and has a cylindrical shape with a bottom corresponding to the shape of the container. The film body 7 is integrally formed.

As shown in FIG. 2, a barrier film 8 forming the barrier film body 7 is formed of an aluminum foil 9 having a thickness of 40 μm by a non-stretched propylene layer 10 having a thickness of 40 μm and a non-stretched propylene layer 11 having a thickness of 80 μm. Resin films such as a multilayer film covering both sides or a multilayer film or a vinylidene chloride layer, a polyamide layer, a saponified ethylene vinyl acetate copolymer resin layer, a vapor-deposited polyester film, a vapor-deposited polyamide film, or a film obtained by similarly treating an iron foil And a multilayer film of a composite film of the metal film and the resin film.

The opening of the side wall 5 is closed by the lid 3. The lid 3 is a drop lid as shown in FIG. 1. The lid 3 is composed of two layers, a resin layer 3a covering the outer surface of the container and a barrier film 3b covering the inner surface of the container. The barrier film 3b of the lid 3 is thermally welded to the barrier film 7 on the inner surface of the expanded portion 6 to seal the container body 2,
This completes the barrier properties of the container.

Next, a method for producing a barrier container according to the present invention will be described.

First, a cut piece 12 having the shape shown in FIG. 3A is cut out from the sheet of the barrier film having the structure shown in FIG. 2, and one side end 12a of the cut piece 12 is cut in FIG. 3B. Fold as shown.

Then, as shown in FIG. 4 and FIG.
Wrap 12 tightly around shaft 13. At this time, as shown in FIG. 4, the bent side end 12a of the cut piece 12 is formed.
Is overlapped with the other side end portion 12b such that the inside is inside, and the overlapped portion is thermally welded.

On the other hand, as shown in FIG. 5, the lower end of the cut piece 12 protrudes from the distal end 13a of the shaft 13 as a protrusion 12c. In this protruding portion 12c, as shown in FIG.
A bottom molded body 14 having a bottom surface 14a and a relatively shallow hanging portion 14b hanging down from the periphery of the bottom surface 14a is fitted,
The hanging portion 14b of the bottom molded body 14 and the protruding portion 12c of the cut-off piece 12 are sandwiched between a heating bar 15 and a cylindrical heating ring 16 separable from the center, and are thermally welded.

Next, the welded portion of the hanging portion 14b of the bottom molded body 14 and the protruding portion 12c of the cut piece 12 is folded inward in the radial direction, and the folded portion is pressed against a heating plate (not shown),
The folded portion and the bottom surface 14a of the bottom molded body 14 are thermally welded.

Finally, the cutting piece 12 is removed from the shaft 13 and the upper end of the cutting piece 12
Bend 12d so that it protrudes radially outward, and
7 to form a bottomed cylindrical barrier film 1 shown in FIG.
Finish the molding of 8.

Next, as shown in FIG. 8, the barrier film 18 is firmly fitted into the molded male mold 19. At this time, the barrier film 18 is sucked from the suction ports 19a, 19a provided in the molded male mold 19. Next, as shown in FIG. 9, the molded male mold 19 and the molded female mold 20 covered with the barrier film body 18 are combined to form a cavity corresponding to the shape of the container body 2.
21 is formed, and polypropylene (P
Resin such as P), polyethylene (PE), polyester, polycarbonate (PC), polystyrene (PS)
The barrier film 18 injected from the injection ports 20a and 20a formed in the container 20 and covered by the molding die 19 is integrally formed so as to cover the inner surface of the container main body, and the container main body 2 shown in FIG.
The molding of is ended. At this time, one side end of the cut piece 12
Since 12a is bent, the metal foil 9 (FIG. 2) on the end face of the barrier film 8 is not exposed on the inner surface of the molded container, so that mixing of the metal component into the contents can be prevented. .

Finally, the container body 2 is removed from the molding die, the cover body 3 is covered with the cover body 3, and the cover body 3 and the container body 2 are thermally welded to each other at the expanding portion 6 to form the barrier container 1 (FIG. 1). End production.

〔The invention's effect〕

Since the present invention is configured as described above, it is possible to mold a deep-bottom container having excellent barrier properties even at the bottom, and in addition, by performing printing on the barrier film in advance, it is possible to perform printing without risk of peeling to the container. The effect that it becomes possible to apply is produced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a barrier container according to the present invention, and FIG.
FIG. 3 is a cross-sectional view showing the configuration of the barrier film, FIG. 3 (a) is a plan view showing a cut piece of the barrier film, FIG. 3 (b) is a plan view showing a cut piece of the barrier film having one end bent, FIG. 4 is a cross-sectional view showing a state in which a cut piece is wound around a shaft, FIG. 5 is a vertical sectional view showing a state in which a cut piece is wound around a shaft, and FIG. Sectional view showing a state, FIG.
FIG. 8 is a perspective view showing a barrier film body, FIG. 8 is a cross-sectional view showing a state in which the barrier film body is covered on a molded male mold, FIG. 9 is a cross-sectional view showing a state in which a molded male mold and a molded female mold are combined, FIG. 10 is a cross-sectional view showing a container body, FIG. 11 is a perspective view showing a state where a circular blank is cut from a barrier film, FIG. 12 is a perspective view showing a barrier film molded body, and FIG. 13 is a conventional container. FIG. 1 ... barrier container, 2 ... container body, 3 ... lid, 7,
18 ... barrier film body, 14 ... bottom formed body, 19 ... molded male mold, 20 ... molded female mold, 21 ... cavity.

Continuation of the front page (72) Inventor Yoshitaka Asai 1-1-1, Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (56) References JP-A-3-668 (JP, A) JP-A-1 −164117 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B29C 45/00-45/17 B65D 1/00 B29C 22:00

Claims (2)

(57) [Claims] 1. A bottomed cylindrical barrier film body integrally formed by combining a bottom formed body preliminarily formed by a barrier film with the bottom of a cylindrically formed barrier film having both ends opened. A barrier container having a container body integrally formed of an injection resin so that the barrier film body forms an inner surface of the container, wherein the container body has a flat circular shape in which a folded portion of the barrier film is folded. 1. A barrier container comprising: a bottom portion of the container; a cylindrical side wall portion rising from the periphery of the bottom portion; and an expanding portion expanding outward from an end of an opening of the side wall portion. 2. A bottomed cylindrical barrier film body integrally formed by combining a cylindrically formed barrier film having both ends opened and a bottom molded body formed in advance by the barrier film, After the portion extending downward from the periphery of the bottom surface of the film body is folded inwardly in the radial direction and welded, the barrier film body is covered with a molded male mold, and a molded male mold and a molded female mold covered with the barrier film body are formed. A cavity is formed by injecting a molding resin into the cavity, and a container body having a circular flat bottom is integrally formed so that the barrier film body covers an inner surface of the container body. Method for producing a sex container.