JPH03668A - Barrier package and its manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to 1. a container having gas barrier properties and a method for manufacturing the same.

[Conventional technology]

In recent years, barrier containers made of injection resin that are inexpensive, lightweight, and have high barrier properties against oxygen, water vapor, etc. have appeared, replacing metal cans such as tin cans and aluminum cans.

As such a barrier container, a barrier container is used in which a bottom portion and a cylindrical side wall portion rising from the periphery of the bottom portion are covered with a barrier film.

[Problem to be solved by the invention]

However, in conventional containers, the barrier film only covers the bottom of the container and the cylindrical side wall that rises from the periphery of the bottom. There was no container configured to cover the flange with a barrier film. Therefore, when sealing the opening of the container with a lid containing a barrier film, the 12th
As shown in the figures and FIG.
After covering the container, the barrier film 52 of the dropped M2O must be adhered to the barrier film 54 of the side wall portion 53 of the container body 51, which poses a problem of complicating the manufacturing process of the container.

In view of the above points, the present invention aims to provide a barrier container whose flange portion is covered with a barrier film and a method for manufacturing the same.

[Means to resolve communication]

Therefore, in the present invention, the barrier container has a bottom, a cylindrical side wall rising from the periphery of the bottom, and a flange projecting in the outer circumferential direction from the upper end of the side wall, and the bottom, side wall, and flange are connected to each other. covered with a barrier film, the opening at the upper end of the side wall portion is sealed with a barrier lid, and the barrier film on the flange portion and the barrier film on the periphery of the lid are adhered;
A method for manufacturing a barrier container includes molding a barrier film into a shape having a flange portion to correspond to the container, combining a male mold and a female mold to which this molded body is attached to form a cavity, and filling the resin into the cavity. integrally molding the molded body of the barrier film attached to the male mold and the resin by injecting the resin;
The opening of the container was sealed with a barrier lid, and the barrier film on the flange of the container and the barrier film on the periphery of the lid were bonded together.

[Effect]

By integrally molding a molded body of a barrier film, one end of which protrudes like a flange in the direction of the outer periphery, and injection resin into a male mold,
The flange-like protruding portion at the end of the barrier film can be molded to cover the flange portion of the molded container.

Further, since the flange of the barrier container is covered with a barrier film, complete barrier properties can be obtained by adhering a sheet-like lid containing the barrier film at the flange of the container.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a barrier container 1 according to the present invention, which includes a circular bottom portion 2, a cylindrical side wall portion 3 rising from the periphery of the bottom portion, and a radially outward direction from the vicinity of the opening of the side wall portion 3. It has a protruding flange portion 4.

The bottom portion 2, side wall portion 3, and flange portion 4 are made of resin such as polypropylene (PP), polyethylene (PE), polyester, polycarbonate (PC), and polystyrene (PC).

The inner surfaces of the bottom portion 2 and the side wall portion 3 of the container, and the outer surface of the flange portion 4 that is continuous with the inner surface of the side wall portion of the container, are covered with a barrier 115 having barrier properties against gas. This barrier WA5 is made of aluminum foil 6 with a thickness of 40 μm as shown in FIG.
A multilayer film covered on both sides with a 1 m unstretched propylene layer 7 and an 80 μm thick unstretched propylene layer 8, or a multilayer film obtained by similarly treating iron foil, or a vinylidene chloride layer, a polyamide layer, and a saponified ethylene-vinyl acetate copolymer. A resin layer, a resin film such as a vapor-deposited polyester film or a vapor-deposited polyamide film, a composite film of these films, and a multilayer film of a composite film of the above-mentioned metal film and resin film are used.

The opening in the side wall is closed with a lid 9 made of resin or the like. The inner surface of the container of this lid 9 is covered with a barrier film 10 shown in FIG.
P1110 is thermally welded to the barrier film 5 on the outer surface of the flange portion 4 at the flange portion 4, thereby sealing the container and perfecting the barrier properties of the container.

Next, a method for manufacturing a barrier container according to the present invention will be explained.

First, cut pieces 11 of the barrier film shown in FIG.
is wrapped around the cylindrical male die 12.

At this time, the cut piece 11 is tightly wrapped at the tip of the male mold by being vacuumed from the suction port 12b provided in the male mold, and at the root of the male mold, it is placed at a certain distance from the male mold. so that the cut piece can be wrapped around it.

In this state, as shown in FIG. 4(a), there is a male in the female mold 13! Combine u12 to 0. As a result, the cut piece 11
The end portion of the male die 12 is bent along the notch 12a at the base of the male die 12, and is wound tightly around the male die 12. Note that the end of this bent cut piece is the barrier container 1.
(Fig. 4(b)
)).

At this time, the lowermost end of the cut piece 11 protrudes from the tip of the male die.

On the other hand, the preform 1 shown in FIG. 5 is placed at the bottom of the female mold.
Fix 4. This preformed body 14 is a barrier container 1
The outer wall surface of this preform 14 is covered with a barrier film 15 shown in FIG. I have limbs. Further, in the vicinity of the opening of the rising portion] 6, a flange-shaped protrusion 1 that protrudes outward in the radial direction is provided.
7 is formed.

This preformed body 14 is formed, for example, as shown in FIGS. 6 to 8.

First, cut pieces 18a and 18B having a shape corresponding to the shape of the preform 14 are punched out from the barrier film sheet 18 shown in FIG. 2 using a cutter. This cut piece 18a is attached to the tip end surface of the male mold 19 as shown in FIG.

The male mold 19 is provided with an injection hole 20 for injecting resin and a vacuum suction and air injection hole 21.21 located radially outward from the injection hole 20. connected to a source of compressed air or connected to a source of compressed air. When the cut piece 18a is suctioned and fixed to the tip wall of the male die 19, vacuum is drawn through the hole 21, but at this time, the outer peripheral end 18b of the cut piece 18a is
It protrudes outward from the tip surface of the male die 19.

Next, the male! 4219 and the female mold 22 to form a cavity 23, which is made of polypropylene (PP), polyethylene (PE), polyester, polycarbonate (PC).
, insert resin such as polystyrene (PS) into the injection hole 2 of the male mold 19.
Eject from 0. At the same time, switch the valve and
The cut piece 18a is cut by injection pressure of the resin by blowing air from the
help you move. That is, the air is used so that the cut pieces 18a are moved evenly by the injection pressure. As a result, the cut piece 18a is pressed against the inner wall 22a of the female mold 22, and the outer peripheral end 18b of the cut piece 18a is pressed against the inner wall 22a of the female mold 22.
The inner wall 22a of No. 2 also rises to cover the rising portion 16 of the preform 14 (FIG. 8). Although this method has a limit on the thickness of the molded product, it is possible to mold products with a wall thickness of 51 ml or more. Note that the female J4222 is provided with a notch 23 for forming the protrusion 17 of the side wall 16 of the preform 14.

Next, as shown in FIG. 9, the male mold 12 with the cut piece 11 wound thereon is assembled into the female mold 24 to form a cavity 25. At this time, the lower end of the cut piece 11 is brought into contact with the barrier film end 15a covering the rising part 16 of the preform 14 fixed in advance in the female mold 24.

The molding female mold 24 is provided with several injection holes 26, 26 extending circumferentially at appropriate intervals on the bottom surface 25a of the cavity.
), polyethylene (PE), polyester, polycarbonate (PC), polystyrene (PS'), and other resins are injected.

At this time, by providing a protrusion 17 that protrudes radially outward 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 of being pressed against the barrier film 15a on the outer peripheral surface of the preform 14, so that the overlapping portions of the cut piece 11 around the male die 12 and the barrier film 15a on the outer peripheral surface of the preform 14 are reliably bonded. Therefore, it may be configured so that a container with even better barrier properties can be provided (FIG. 10). In this case, the end portion of the barrier film of the preform extending to the vicinity of the side wall portion and the lower end portion of the cut piece made of the barrier film are melted and adhered to each other, thereby ensuring the barrier properties of the bottom of the container.

Incidentally, instead of the cut piece 11, a tape-shaped barrier film may be spirally wound to form the body 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.

Note that in the present invention, a barrier film body corresponding to the shape of the container may be prepared in advance and placed in the male mold 12 once, and the method for forming the bottom of the barrier container is also limited to this embodiment. It's not a thing.

〔Effect of the invention〕

Since the present invention is configured as described above, it is possible to cover the flange of the container with the barrier film, and therefore, it is possible to obtain complete barrier properties without dropping the lid and use it as a lid, and to prevent moisture and oxidation. This has the effect of ensuring the preservation of the contents that are sensitive to water.

[Brief explanation of 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 structure of the barrier film, Fig. 3 is a cross-sectional view showing the state in which the cut piece is placed on the male die, and Fig. 4 (a) is a sectional view showing the cut piece being wrapped around the male die and the cut piece is attached to the flange. 4(b) is a sectional view showing the state in which the cut piece is wound around the male die; FIG. 5 is a sectional view of the preform;
Fig. 6 is a perspective view showing a state in which cut pieces are cut from a barrier film sheet, Fig. 7 is a cross-sectional view showing the preform manufacturing device before injection, and Fig. 8 is a preform manufacturing device after injection. 9 is a sectional view of an injection molding apparatus, FIG. 10 is a partially enlarged view of FIG. 9, FIG. 11 is a sectional view of a barrier container according to the present invention, and FIG. 12 is a conventional one. FIG. 13, a perspective view showing a barrier container, is a sectional view showing an opening of a conventional barrier container. 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 ... Pre-formed body, 2
4...Female mold, 25...Cavity. Applicant's representative Yasuo Ishikawa Figure 1 Figure 3 Figure 5 Figure 2 Figure Figure Figure Figure Figure Figure

Claims (1)

[Claims] 1. It has a bottom part, a cylindrical side wall part rising from the periphery of the bottom part, and a flange part protruding from the upper end of the side wall part in the outer circumferential direction, and the bottom part, the side wall part, and the flange part are covered with a barrier film. 1. A barrier container, characterized in that the opening at the upper end of the side wall is closed with a barrier lid, and the barrier film on the flange portion and the barrier film on the periphery of the lid are adhered to each other. 2. Molding the barrier film into a shape with a flange to correspond to the container, combining the male and female molds to which this molded body is attached to form a cavity, and injecting resin into the cavity to form a cavity. The barrier film molded body attached to the male mold and the resin are integrally molded, the opening of the container is sealed with a barrier lid, and the barrier film on the flange of the container and the barrier film on the periphery of the lid are sealed. A method for producing a barrier container characterized by adhering.