JP2807263B2 - Barrier container and method for producing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a 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 such a barrier container, a barrier container having a bottom and a cylindrical side wall rising from the periphery of the bottom covered with a barrier film is used.

[Problems to be solved by the invention]

However, in a conventional container, the barrier film only covers the bottom of the container and the cylindrical side wall rising from the periphery of the bottom. There was no container configured to cover the flange with the barrier film.
Therefore, when the opening of the container is closed with the lid including the barrier film, it is necessary to cover the opening of the container with the lid having a barrier property.
As shown in FIG. 13 and FIG. 13, the lid is a dropping lid 50 whose outside is covered with a barrier film, and after the dropping lid 50 is covered on the container body 51, the barrier film 52 of the dropping lid 50 and the container body 51 Side wall
It has to be adhered to the barrier film 54 of 53, which causes a problem that the manufacturing process of the container is complicated.

Further, there was no legged container in which both barrier films were properly joined at the joint between the inner surface of the side wall and the inner surface of the bottom of the container.

In view of the above, an object of the present invention is to provide a barrier container in which the inner surface of the container is covered with a barrier film, and a method for manufacturing the same.

[Means for solving the problem]

Therefore, in the present invention, the barrier container has a bottom part, a cylindrical side wall part rising from the periphery of the bottom part, a flange part protruding in the outer peripheral direction from the upper end of the side wall part, and a leg part protruding downward from the periphery of the bottom part. The inner surface of the bottom portion, the inner surface of the side wall portion, and the upper surface of the flange portion contiguous thereto are covered with a barrier film, and the opening at the upper end of the side wall portion is closed with a lid having the inner surface of the barrier film. The film and the barrier film on the peripheral edge of the lid are adhered, and the lower end of the barrier film covering the inner surface of the side wall portion and the peripheral edge of the barrier film covering the inner surface of the bottom portion extend along the junction between the bottom portion and the side wall portion. A method of manufacturing a barrier container, wherein the barrier film is formed into a shape having a flange portion so as to correspond to a side wall portion of the container, and a molded body of the barrier film is formed. Attached to male mold On the other hand, the outer wall surface of a flat portion to be the bottom inner surface of the container and a rising portion to be the leg portion of the container, and the outer wall surface of the flat portion and the rising portion continuous to the periphery of the flat portion were covered with a barrier film. A preform is prepared, and after attaching the preform to the female mold, the male mold and the male mold are so arranged that the lower end of the barrier film molded body and the barrier film covering the rising portion of the preform are in contact with each other. A cavity is formed by combining a female mold, and a resin is injected into the cavity to integrally mold the molded body of the barrier film, the preformed body and the resin, and the opening of the container has a lid having an inner surface of the barrier film. The container was closed, and the barrier film at the flange of the container and the barrier film at the periphery of the lid were bonded.

[Action]

By integrally molding the molded body of the barrier film whose one end protrudes in a flange shape in the outer peripheral direction and the injection resin into the male mold, the flange portion of the end of the barrier film protruding in the shape of a flange forms the flange portion of the container. It can be molded to cover.

Further, by covering the flange portion of the barrier container with the barrier film and bonding the sheet-like lid including the barrier film at the flange portion of the container, complete barrier properties can be obtained.

Furthermore, since the lower end of the barrier film covering the inner surface of the side wall portion of the container and the periphery of the barrier film covering the inner surface of the bottom portion are adhered by penetrating downward along the junction between the bottom portion and the side wall portion, Complete barrier properties can be obtained even at the bottom of 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 has a circular bottom portion 2, a cylindrical side wall portion 3 rising from the periphery of the bottom portion, and a radially outward portion near an opening of the side wall portion 3. And a projecting flange portion 4.

The bottom part 2, the side wall part 3, and the flange part 4 are formed of a resin such as polypropylene (PP), polyethylene (PE), polyester, polycarbonate (PC), polystyrene (PC), or the like.

The outer surface of the flange portion 4 which is continuous with the inner surface of the container at the bottom portion 2 and the side wall portion 3 and the inner surface of the container at the side wall portion is covered with a barrier film 5 having a barrier property against gas. This barrier film 5 is a multilayer film in which an aluminum foil 6 having a thickness of 40 μm as shown in FIG. 2 is covered on both sides with a non-stretched propylene layer 7 having a thickness of 40 μm and a non-stretched propylene layer 8 having a thickness of 80 μm. A resin film such as 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, etc.
Alternatively, a composite film of these films, or a multilayer film of a composite film of the above-mentioned metal film and resin film is used.

The opening of the side wall is closed by a lid 9 made of resin or the like. The inner surface of the container of the lid 9 is covered with a barrier film 10 shown in FIG.
Numeral 10 indicates that the container is hermetically sealed by being thermally welded to the barrier film 5 on the outer surface of the flange portion 4 at the flange portion 4 to complete 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 11 obtained by cutting the barrier film shown in FIG.
Is wound around a cylindrical male mold 12. At this time, the cut piece 11 is provided at the tip of the male mold with the suction port 12 provided in the male mold.
It is wound tightly by evacuation from b. At the root of the male mold, the cut piece is wound around the male mold at a certain interval.

In this state, the male mold 12 is combined with the female mold 13 as shown in FIG. As a result, the end of the cut piece 11 is bent along the notch 12a at the root of the male mold 12, and the male mold 12 is bent.
Will be tightly wound around. Note that the end of the bent cut piece is the flange 4 of the barrier container 1.
(FIG. 4 (b)). At this time, the lowermost end of the cut piece 11 protrudes from the male tip.

On the other hand, the preformed body shown in FIG.
Fix 14 The preform 14 constitutes the bottom 2 of the barrier container 1, and the outer wall surface of the preform 14 is covered with a barrier film 15 shown in FIG. Reference numeral 15a covers the rising portion 16 of the preform 14. In the vicinity of the opening of the rising portion 16, a flange-shaped projection 17 projecting outward in the radial direction is formed.

The preform 14 is formed, for example, as shown in FIGS.

First, cut pieces 18a, 18a each having a shape corresponding to the shape of the preform 14 are punched out from the barrier film sheet 18 shown in FIG. The cut piece 18a is adsorbed to the tip end of the male mold 19 as shown in FIG. The male mold 19 is provided with an injection hole 20 for injecting the resin and a vacuum evacuation and air ejection holes 21 and 21 located radially outward from the injection hole 20, and this hole 21 is evacuated by switching a valve. Or a compressed air source. The cut piece
When affixing 18a to the tip wall of male mold 19 by suction,
1 is evacuated.
18 b protrudes outward from the tip surface of the male mold 19.

Next, the male mold 19 and the female mold 22 are combined to form the cavity 23.
Forming polypropylene (PP), polyethylene (P
E) Inject resin such as polyester, polycarbonate (PC), polystyrene (PS), etc. through the injection hole 20 of the male mold 19. At the same time, the valve is switched to eject air from the hole 21 to assist the movement of the cut piece 18a by the injection pressure of the resin.
That is, the air causes the cut piece 18a to move on average by the injection pressure. This allows cutting pieces 18
a is pressed against the inner wall 22a of the female mold 22, and the outer peripheral end 18b of the cut piece 18a also rises on the inner wall 22a of the female mold 22 to cover the rising portion 16 of the preform 14 (the 8). This method has a limitation on the thickness of the molded product, but it is possible to mold a molded product having a thickness of 5 mm or more. Note that the preform 14 is
A notch 23 for forming the projection 17 of the side wall 16 is formed.

Next, as shown in FIG. 9, the male mold 12 around which the cut pieces 11 are wound is assembled in the molded female mold 24, and the cavity 25 is formed.
To form At this time, the lower end of the cut piece 11 is
The barrier film end 15a covering the rising portion 16 of the preform 14 fixed in the inside 24 is brought into contact. The molding female mold 24 is provided with a plurality of injection holes 26, 26 extending at appropriate intervals in the circumferential direction on the bottom surface 25a of the cavity. From these injection holes 26, polypropylene (PP), polyethylene (PE), polyester And a resin such as polycarbonate (PC) and polystyrene (PC).

At this time, by providing a projection 17 projecting outward in the radial direction at the end of the side wall 16 of the preform 14, when the resin is injected into the cavity 25, the cut piece 11 wrapped around the male mold 12. Flows in the direction pressed against the barrier film 15a on the outer peripheral surface of the preform 14, so that the bonding of the overlapping portion between the cut piece 11 around the male mold 12 and the barrier film 15a on the outer peripheral surface of the preform 14 is ensured. And may be configured to provide a container having more excellent barrier properties (No. 10
Figure). In this case, the end extending to the vicinity of the side wall of the barrier film of the preform and the lower end of the cut piece formed of the barrier film are in close contact with each other, so that the barrier property of the container bottom is ensured.

Instead of the cut pieces 11, a tape-shaped barrier film may be spirally wound to form a trunk barrier film of the container.

Finally, the molded product is removed from the mold, and the molding of the container 27 shown in FIG. 11 is completed.

In the present invention, a barrier film body corresponding to the shape of the container may be prepared in advance, and this may be fitted into the male mold 12, and the method of forming the bottom of the barrier container is also limited to this embodiment. is not.

〔The invention's effect〕

Since the present invention is configured as described above, it is possible to cover the entire inner surface of the container with the barrier film, and therefore, it is possible to ensure the preservation of the contents that are resistant to moisture and oxidation.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a barrier container according to the present invention,
FIG. 2 is a cross-sectional view of the configuration of the barrier film, FIG. 3 is a cross-sectional view showing a state where a cut piece is placed on a male mold, and FIG. 4 (a) is a figure in which the cut piece is wound on a male mold and the cut piece is flanged. FIG. 4 (b) is a cross-sectional view showing a state in which a cut piece is wound around a male die, FIG. 5 is a cross-sectional view of a preform,
6 is a perspective view showing a state in which a cut piece is cut from the sheet of the barrier film, FIG. 7 is a cross-sectional view showing a preformed body manufacturing apparatus before injection, and FIG. 8 is a preformed body manufacturing apparatus after injection. 9 is a sectional view of the injection molding apparatus, and FIG.
FIG. 11 is a partially enlarged view of the figure, FIG. 11 is a cross-sectional view showing a barrier container according to the present invention, FIG. 12 is a perspective view showing a conventional barrier container, and FIG. 13 shows an opening of the conventional barrier container. It is sectional drawing. DESCRIPTION OF SYMBOLS 1 ... Barrier container 2 ... Bottom part 3 ... Side wall part 4 ... Flange part 5, 10 ... Barrier film 9 ... Lid body 12 ... Male mold 14 ... Preformed body 24 ... Female mold 25 ... …cavity

──────────────────────────────────────────────────続 き Continued on the front page (72) Kyosuke Suzuki, Inventor Kyosuke Suzuki 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (72) Inventor Yoshio Asai 1-1-1, Ichigaya-cho, Shinjuku-ku, Tokyo No. 1 Inside Dai Nippon Printing Co., Ltd. (72) Inventor Yukio Yoshikawa 17-11 Fujikubo, Miyoshi-cho, Iruma-gun, Saitama (56) References Japanese Utility Model Sho-56-81869 (JP, U) Japanese Utility Model Sho-54-180035 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B65D 77/20

Claims (2)

(57) [Claims] 1. An inner surface of the bottom having a bottom, a cylindrical side wall rising from the periphery of the bottom, a flange protruding from an upper end of the side wall in an outer peripheral direction, and a leg protruding downward from the periphery of the bottom. And the inner surface of the side wall portion and the upper surface of the flange portion connected thereto are covered with a barrier film, and the opening at the upper end of the side wall portion is closed with a lid having an inner surface of the barrier film. The lower end of the barrier film covering the inner surface of the side wall portion and the peripheral edge of the barrier film covering the inner surface of the bottom portion sneak downward along the junction between the bottom portion and the side wall portion, and A barrier container which is adhered. 2. A barrier film is formed into a shape having a flange so as to correspond to a side wall of a container, and a formed body of the barrier film is attached to a male mold, while a flat portion to be an inner bottom surface of the container and A preform having a rising portion to be a leg of the container and having an outer wall surface of the flat portion and a rising portion continuous to the periphery of the flat portion covered with a barrier film is prepared. After attaching to the mold, a cavity is formed by combining the male mold and the female mold such that the lower end of the molded body of the barrier film and the barrier film covering the rising portion of the preform are in contact with each other. The molded body of the barrier film, the preformed body and the resin are integrally molded by injecting a resin into the resin, the opening of the container is closed with a lid having an inner surface of the barrier film, and the barrier film of the flange portion of the container is formed. And of the lid The method for producing a barrier container, characterized in that adhering the edges of the barrier film.