JP2837438B2 - 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.

These containers are made of a barrier film sheet as shown in FIG.
Cut the circular blanks 51 and 51 from the
A barrier film molded body 53 (FIG. 9) 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. 10).

[Problems to be solved by the invention]

However, in this kind 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 view of the above, an object of the present invention is to provide a barrier container having no wrinkles and having a deep bottom and a method for producing the same.

[Means for solving the problem]

Therefore, in the present invention, a barrier film body in which a resin layer is formed on the inner surface of a metal foil body formed by folding one opening of a metal foil formed into a cylindrical shape by a drawing process to form a bottom part is included. Then, the barrier film body was configured to have a container body integrally formed of an injection resin so as to form an inner surface of the container.

Also, one opening of a metal foil formed of a metal material into a cylindrical shape by drawing is folded in the radial direction to form a bottomed cylindrical metal foil body, and the inner surface of the metal foil body is coated with a resin. Forming a cavity by molding a barrier film body, covering the barrier film body on a molding male mold, and combining the molding male mold and the molding female mold covered with the barrier film body with a molding resin. By injecting, the container body is integrally formed so that the barrier film body covers the inner surface of the container body.

[Action]

A cylindrical metal foil is formed by the drawing process, and the inner surface of the bottomed cylindrical metal foil body formed by folding one of the openings of the cylindrical metal foil is formed by resin coating. In a container obtained by integrally molding a metal foil body with an injection resin, there is no possibility that wrinkles will occur in a barrier film on the side wall portion, and the surface of the metal foil body will not be exposed on the inner surface of the molded container. Therefore, there is no possibility that pinholes will be generated, and it is possible to form a container having a deep bottom. In addition, it is possible to perform printing in which there is no possibility that the container will be peeled off by printing the barrier film in advance.

〔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 radially outward from an end of the opening 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.

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, as shown in FIG. 2, one end of a metal tube 8 made of metal such as aluminum is gripped by a pull-out member p, and a mandrel m is formed in a die 9 having a predetermined hole shape.
To form a cylindrical metal foil 10.
At this time, to increase the thickness of the metal foil to a predetermined size,
A mandrel is inserted at the center of the tube. Next, the formed cylindrical metal foil 10 is cut to a predetermined length, one opening is folded inward in the radial direction to form a bottom portion 11, and the other opening projects radially outward. Then, an expanded portion 12 is formed, and a cylindrical metal foil body 13 with a bottom as shown in FIG. 3 is formed.

Next, as shown in FIG. 4, a large number of injection ports 14a,
An injection nozzle 14 having 14a, ... formed therein is inserted into the metal foil body, and a resin such as polypropylene (PP), polyethylene (PE), polyester, polycarbonate (PC), polystyrene (PS) is injected from the injection port 14a. The resin film 15 is sprayed in the form of a mist, and the inner surface of the metal foil body 13 is coated with resin to form a resin layer 15, and the forming of the barrier film body 16 shown in FIG.

Next, as shown in FIG.
Firmly fit into the molded male mold 17. At this time, the molded male mold 17
The barrier film body 16 is sucked from the suction ports 17a, 17a provided in the nozzle. Then, as shown in FIG.
The molded male mold 17 and the molded female mold 18 covered with the barrier film body 16
To form a cavity 19 corresponding to the shape of the container body 2, and a resin such as polypropylene (PP), polyethylene (PE), polyester, polycarbonate (PC), or polystyrene (PS) is formed in the cavity 19. The barrier film body 16 injected from the injection ports 18a, 18a provided in the mold 18 and covered by the molded male mold 17 is integrally formed so as to cover the inner surface of the container main body, and is formed integrally with the container main body 2 (FIG. 1). Finish the molding.

At this time, since the resin layer 15 is formed on the inner surface of the metal foil 13 (FIG. 5), the surface of the metal foil 13 is not exposed to the inner surface of the molded container, and Metal components can be prevented from being mixed in.

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 container having a deep bottom having excellent barrier properties, and also, by molding a resin layer on the inner surface of a metal foil body, a container in which a metal foil is formed. Because it will not be exposed on the inner surface of
This has the effect of preventing metal components from being mixed into the contents.

[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 a state where a cylindrical metal foil is formed by drawing, FIG. 3 is a perspective view showing the formed metal foil body,
FIG. 4 is a cross-sectional view showing a state in which a resin layer is formed on the inner surface of the metal foil body, FIG. 5 is a cross-sectional view showing a barrier film body, and FIG. Sectional view, seventh
The figure is a cross-sectional view showing a state in which a molded male mold and a molded female mold are combined, FIG. 8 is a perspective view showing a state in which a circular blank is cut from the barrier film, FIG. 9 is a perspective view showing a barrier film molded body,
FIG. 10 is a sectional view showing a conventional container. 1 ... barrier container, 2 ... container body, 3 ... lid,
7, 16: barrier film body, 13: metal foil body, 15: resin layer, 17: molded male mold, 18: molded female mold, 19: cavity.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yoshitaka Asai 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd. (56) References Japanese Utility Model 1-164117 (JP, U) ( 58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 45/00-45/17 B65D 1/00 B29L 22:00

Claims (2)

(57) [Claims] A metal film formed into a cylindrical shape by a drawing process, wherein one of the openings is folded into a metal foil body having a bottom portion formed by forming a resin layer on an inner surface of the metal foil body;
A barrier container having a container body integrally formed of an injection resin so that the barrier film forms an inner surface of the container. 2. A metal foil having a cylindrical shape with a bottom formed by bending one opening of a metal foil formed of a metal material into a cylindrical shape by a drawing process in a radial direction, and forming an inner surface of the metal foil with a resin. To form a barrier film body, cover the barrier film body with a forming male mold, combine the forming male mold and the forming female mold covered with the barrier film body to form a cavity, and form a cavity in the cavity. A method of manufacturing a barrier container, comprising injecting a molding resin and integrally molding the container body so that the barrier film body covers the inner surface of the container body.