JP2863548B2 - Method for producing barrier container and container thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a resin-molded barrier container having a barrier property against gas or water vapor or the like, which can replace a conventional metal can, and the container. .

[Conventional technology]

Recently, containers made of an injection resin that is inexpensive and light in place of metal cans such as tin cans and aluminum cans and have high barrier properties against gas or water vapor have appeared.

As shown in FIG. 5, these containers are made of aluminum having a thickness of 40 μ in order to obtain a high barrier property, for example, an unstretched polypropylene layer 51 having a thickness of 40 μ and an unstretched polypropylene layer 52 having a thickness of 80 μ on both sides. From the barrier film sheet 53 covered,
As shown in the figure, the circular blanks b and b are cut out, and a barrier film molded body 56 (FIG. 8) having substantially the same shape as the container is formed while forming a rising wall 57 while folding the peripheral portion thereof, and this is injection-molded. to manufacture containers for injection to shallow the for example polypropylene as the barrier film formed body 56 is placed in the cavity on the inside of the container C ₁ in the wall (PP) of the male and female use (FIG. 9).

[Problems to be solved by the invention]

However, in this type of conventional barrier container, when forming the barrier film molded body 56, a blank cut out from a flat barrier film sheet is formed by folding, so that wrinkles are formed as shown in FIG. In addition, 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 method of manufacturing a barrier container capable of easily manufacturing a deep-bottom container maintaining a barrier property without wrinkles, and an object of the present invention to provide a barrier container manufactured by this method. I do.

[Means for solving the problem]

Therefore, the present invention provides a method of manufacturing a barrier container, in which a barrier film body having a barrier property against gas or water vapor or the like and having a shape of a container to be manufactured is housed in a cavity between a male mold and a female mold. By injecting resin into the
In the method for manufacturing a barrier container for manufacturing a container having a barrier property by integrating the barrier film and the resin, a body for covering the body of the container with the barrier film body, and a container A bottom portion for covering a bottom portion of the container, and a flange portion for covering a flange portion of the container, at least a body portion and a bottom portion are separated, and the body portion of the barrier film is wound around a male mold, and the barrier film is formed. The bottom of the body is fitted to the male mold so as to overlap the lower end of the body, and the male and female molds are fitted together to inject resin into a cavity formed between the two molds, and the barrier is formed. In a barrier container covered with a barrier film having a barrier property against gas or water vapor, a barrier film flange portion for covering a flange portion of the container in the wall of the barrier container, Cover the body of the container At least the barrier film body and the barrier film bottom are embedded in the barrier film body and the barrier film bottom formed separately from the barrier film body for covering the bottom of the container. It was configured to be integrated with the resin.

[Action]

The barrier film body embedded in the wall of the container is manufactured separately from at least the body and the shallow bottom, and the body of the barrier film is wound around the outer periphery of the male mold and the bottom is fitted into the lower part of the male mold. The male mold is combined with the female mold, and a resin such as polypropylene (PP) or polyethylene (PE) is inserted into the cavity.

This eliminates the need for deep drawing when manufacturing the barrier film body, so that the bottom can be made shallow, without wrinkles, and without a pinhole that impairs barrier properties. can do.

In addition, the container manufactured in this way has a good barrier property and can store a wide variety of items because it is deep.

〔Example〕

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

Figure 1 is a barrier container C ₂ of deep to be produced by the method of the present invention, the inner wall of the container C ₂ is made from the barrier film 1, as the aria film 1 already shown in FIG. 5 The structure consists of a polypropylene or polyethylene layer (thickness 40μ, 80μ) on both sides of an aluminum layer (thickness 40μ)
It was covered by. The outside of the barrier film is covered with a resin layer 2 (polypropylene or polyethylene layer) having an appropriate thickness, and the barrier film 1 is extended to the flange 3 of the container as necessary. In addition, as a configuration of the barrier film, the central portion may be an iron foil, and 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 the like may be used as a resin on both sides. Good.

Containers C ₂ such deep, the second view is injection molded as shown in Figure 3.

First, the barrier film having the layer structure as described above is cut into a substantially rectangular shape, and the body 10 and the shallow bottom 11 formed by the mold deepening process are separately prepared. The body 10 is wound around the male mold 12 without any wrinkles, and the winding end 10a is overlapped and bent as shown in FIG.
Attached around 10.

Next, the bottom portion 11 is fitted to the tip of the male mold 12, so that the rising portion 11a of the bottom portion 11 overlaps the lower end of the body portion 10 from above. The bottom 11 may be evacuated, if necessary, through a vacuum evacuation hole 13 provided in the male mold 10.
At this time, a vacuum hole (not shown) is also provided on the peripheral wall of the male mold 12.
May be provided to adsorb the body 10.

In such a state, the male mold 12 is combined into the female mold 16 and an injection resin (polypropylene, polyethylene, polyester, polycarbonate, polystyrene) is injected from the injection tag 14 into the cavity 15 formed between the two molds. .

As described above, the barrier film 1 is manufactured separately from the body 10 and the bottom 11, and the body 10 is wound around the outer periphery of the male mold 12 without wrinkles, and the shallow bottom 11 is formed on the body 10. If they are connected by being overlapped, a barrier film having no wrinkles and having few pinholes and good barrier properties can be obtained. Therefore, even in the case of a deep-bottomed container, the flat barrier film is cut so as to increase the height of the body 10 according to the depth of the container, and the bottom 11 is formed into a shallow bottom regardless of the height of the container. Since it is sufficient to squeeze, a deep-bottom container having no wrinkles in the barrier film can be obtained.

In FIG. 2, the bottom portion 11 is superimposed on the body portion 10. However, the bottom portion 11 may be attached to the male mold 12 first, and the body portion 10 may be wound around the male mold 12 from above. .

Further, when the barrier film 1 is wound around the male mold 12, the polypropylene or polyethylene layer 20 on the side in contact with the injection resin layer 2 is formed by a method such as a T-die method or an inflation method as shown in FIG. If a stretched film layer produced while applying a tensile force to the molten resin is used, the heat resistance is large and the adhesiveness between the injection resin layer 2 and the barrier film 1 becomes good, and the barrier film 1 does not wrinkle. At this time, the inner layer 21 of the barrier film 1 may be unstretched or stretched.

Further, in the embodiment shown in FIGS. 2 and 3, the body 10 and the bottom 11 are manufactured separately, but the flange may be manufactured separately.

Further, as shown in FIG. 6, the body 10 may be extended to the lower end of the male mold 12, and the circular bottom 60 may be attracted to the lower end of the male mold 12. Then, a tape-shaped barrier film may be spirally wound around the male mold 12 instead of the body 10.

〔The invention's effect〕

Since the present invention is configured as described above, a deep-bottomed container having few pinholes can be easily manufactured, and the container manufactured by the present method maintains good barrier properties.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a container manufactured by the method of the present invention,
FIG. 2 is a partial cross-sectional view of an apparatus for implementing the manufacturing method of the present invention, FIG. 3 is an explanatory view showing a state where a barrier film is attached to a male mold, and FIG. 4 is an attached state of the barrier film to the male mold. 5, FIG. 5 is a cross-sectional view of the structure of the barrier film, FIG. 6 is an explanatory view of another embodiment of the present invention, FIG. 7 is a perspective view of a conventional planar barrier film in a blank-cut state, and FIG. Is a perspective view of a barrier film, and FIG. 9 is a sectional view of a conventional container. 1 ... barrier film, 2 ... resin layer, 3 ... flange, 10
…… Torso, 11,60 …… Bottom, 12 …… Male, 16… Female.

Continuing from the front page (72) Inventor Yuichi Hirai 1-1-1, Ichigaga-cho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd. (72) Inventor Yukio Yoshikawa 17-11 Fujikubo, Miyoshi-cho, Iruma-gun, Saitama ( 56) References JP-A-2-98537 (JP, A) JP-A-63-45014 (JP, A) JP-A-49-120953 (JP, A) Full-open 1-164117 (JP, U) Full-open 56-14832 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B29C 45/00-45/17 B65D 1/00 B29L 22:00

Claims (2)

(57) [Claims] 1. A method according to claim 1, wherein a barrier film in the form of a container to be manufactured having a barrier property against gas or water vapor is accommodated in a cavity between a male mold and a female mold, and resin is injected into the cavity. In a method for manufacturing a barrier container for manufacturing a container having a barrier property by integrating the barrier film and the resin, a body for covering the body of the container with the barrier film body, Among the bottom portion for covering the bottom portion of the container, and the flange portion for covering the flange portion of the container, at least the trunk portion and the bottom portion are separated, and the trunk portion of the barrier film body is wound into a male mold, The bottom of the barrier film body is fitted into the male mold so as to overlap the lower end of the body, and the resin is injected into a cavity formed between both molds by fitting the male mold and the female mold. Manufacturing method of a barrier container. 2. A barrier container covered with a barrier film having a barrier property against gas, water vapor, or the like, wherein a barrier film flange portion covers a flange portion of the container in a wall of the barrier container. And a barrier film body for covering the body of the container, and a barrier film bottom formed separately therefrom for covering the bottom of the container, at least the barrier film body and the barrier film bottom are A barrier container, wherein the barrier film body and the resin are integrated and embedded.