JPH0321415A - Vessel with barrier property and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a vessel having a barrier property, which is free from creases and has the deep bottom, by a method wherein a barrier film body formed cylindrically where the bottom part is molded by combining a barrier film formed cylindrically where both ends and opened and a molded body of the bottom part is molded integrally along with injected resin. CONSTITUTION:A cut-off piece 12 is wound firmly round a shaft 13, a side end part 12a of a bent side of the cut-off piece 12 is superposed upon a side end part 12b of the other side so that the side end part 12a becomes the inside and they are fused thermally. On the one hand, a molded body 14 of the bottom part having a shallow suspending part 14b is fitted into a protrusion 12c of the lower end part of the cut-off piece 12 and fused thermally. The fused part is turned in toward the inside and fused to the bottom 14a. The cut-off piece 12 is removed from a shaft 13, the upper end part 12d of the cut-off piece 12 is bent so that the part 12d is projected outside, widened part 17 is formed and the barrier film body 18 is molded. The same is fitted over a molding mole mold 19, a cavity 21 is formed by combining with a molding female mold 20, the resin in injected through an injection port 20a and monolithic molding is performed so that the barrier film body 18 covers an inner surface of a vessel main body.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a barrier container having gas barrier properties and a method for manufacturing the same, for storing contents that dislike humidity and oxidation.

[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 shown in FIG. 11, these containers are made by cutting out a circular blank 51, 51 from a barrier film sheet 50, folding the circumference of this blank 51 to form a rising wall 52, and forming a barrier film that has almost the same shape as the container. Molded body 53 (Fig. 12)
This is placed in the cavity of a male mold and a female mold for injection molding, and a resin such as polypropylene (PP) is injected so that the barrier film or molded body 53 is inside the wall of the container. In this way, a shallow container 54 (FIG. 13) was manufactured.

[Problem to be solved by the invention]

However, in conventional barrier containers of this type,
When molding the barrier film molded body 53, since the flat barrier film blank was folded and molded, wrinkles were formed as shown in FIG. 12. For this reason, there was a risk that bottle holes would occur due to the wrinkles, and only shallow containers could be manufactured. In addition, when printing on containers due to these wrinkles, it was not possible to use a pre-printed barrier film, so printing was applied to the surface of the container, but this type of printing had the problem of easily peeling off. .

In view of the above, an object of the present invention is to provide a barrier container with no wrinkles and a deep bottom, and a method for manufacturing the same.

[Means to solve the problem]

Therefore, in the present invention, a cylindrical barrier film body whose bottom part is formed by combining a pre-shaped bottom molded body with the bottom part of a barrier film formed in a cylindrical shape with open ends at both ends of the barrier container is partially attached. and a container body integrally formed with injection resin so that the barrier film body forms the inner surface of the container, and the barrier film body is formed into a cylindrical shape with both ends open. A cylindrical barrier film having a bottom is formed by combining the formed barrier film and a pre-formed bottom molded body, and this barrier film body is placed on a molded male mold, and the molded male mold covered with this barrier film body is and a female mold were combined to form a cavity, and a molding resin was injected into the cavity to integrally mold the container body so that the barrier film covered the inner surface of the container body.

[Effect]

Since the barrier film formed in the shape of a cylinder with both ends open and the bottom formed by combining the bottom molded body is integrally molded with the injection resin, the barrier film does not wrinkle on the side wall of the container. There is no such thing. Therefore, it is possible to mold a deep-bottomed container with excellent barrier properties without the possibility of pinholes occurring. Furthermore, by printing on the barrier film in advance, it becomes possible to print on the container without fear of it peeling off.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

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

The bottom part 4, side wall part 5 and widening part 6 of the container body 1 are made of polypropylene (PP), polyethylene (PE), polyester, polycarbonate (PC), polystyrene (
It is made of resin such as PS).

Moreover, the bottom part 4, the side wall part 5, and the expanded part 6 of this container body 2
The inner surface of the container is made of a barrier film having gas barrier properties, and a cylindrical barrier film body 7 with a bottom corresponding to the shape of the container is integrally molded.

A barrier film 8 forming this barrier film body 7 is made of aluminum foil 9 with a thickness of 40 um as shown in FIG.
A multilayer film covered on both sides with an unstretched propylene layer 1, or a multilayer film or vinylidene chloride layer treated in the same way as iron foil,
A resin film such as a polyamide layer, a saponified ethylene-vinyl acetate copolymer resin layer, a vapor-deposited polyester film, 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. It will be done.

The opening of the side wall 5 is closed by the lid 3. As shown in FIG. 1, this lid body 3 is a drop lid, and this lid body 3 is composed of two layers: a resin layer 3a that covers the outer surface of the container, and a barrier film 3b that covers the inner surface of the container. and
The barrier film 3b of the lid 3 is thermally welded to the barrier film body 7 on the inner surface of the expanded portion 6, thereby sealing the container body 2 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, a cutout piece 12 having the shape shown in FIG. 3(a) is cut out from a barrier film sheet having the structure shown in FIG. 2, and one side end 12a of this cutout piece 12 is cut out as shown in FIG. 3(b). Fold as shown.

Next, as shown in FIGS. 4 and 5, this cut piece 1
2 tightly around the shaft 13. At this time, as shown in FIG. 4, the bent side end 12a of the cutout piece 12 is overlapped with the other side end 12b so that it is on the inside, and this overlapping part is thermally welded. be done.

On the other hand, the lower end of the cut piece 12 projects from the tip 13a of the shaft 13 as a projection N12c, as shown in FIG. As shown in FIG. 6, inside this protruding portion 12c, a bottom molded body 1 is provided which has a bottom surface 14a and a relatively shallow hanging portion 14b that hangs down from the periphery of the bottom surface 14a.
4 is fitted, and the hanging portion 1 of this bottom molded body 14
4b and the protrusion 12c of the cutout piece 12 are sandwiched between the heating bar 15 and a cylindrical heating ring 16 that can be separated from the center, and are thermally welded.

Next, the hanging portion 14b of the bottom molded body 14 and the cutout piece l
The welded part of the protruding part 12c of 2 is folded inward in the radial direction, and this folded part is pressed against a heating plate (not shown), and this folded part and the bottom surface 14 of the bottom molded body 14
a is thermally welded.

Finally, remove the cut piece 12 from the pongee 13, bend the upper end gl2d of the cut piece 12 so as to protrude outward in the radial direction,
The expanded portion 17 is formed, and the molding of the bottomed cylindrical barrier film body 18 shown in FIG. 7 is completed.

Next, this barrier film body 18 is firmly fitted into the male mold 19, as shown in FIG. At this time, molding male mold 1
The barrier film body 18 is suctioned through the suction ports 19a, 19a provided in the barrier film 9.

Next, as shown in FIG. 9, this barrier film body 18
A molding male mold 19 and a molding female mold 20 covered with the mold are combined to form a cavity 21 corresponding to the shape of the container body 2, and inside this cavity 21, polypropylene (PP), polypropylene (PP),
A resin such as polyethylene (PE), polyester, polycarbonate (PC), polystyrene (PS), etc. is injected from injection ports 20a, 20a provided in the female mold 20, and a barrier film body is placed on the male mold L9. 18 is integrally molded to cover the inner surface of the container body, completing the molding of the container body 2 shown in FIG. At this time, since one side end 12a of the cut piece 12 is bent, the metal foil 9 (FIG. 2) on the end face of the barrier film 8 is not exposed to the inner surface of the sealed container, and the contents It is possible to prevent a certain amount of metal from being mixed into objects.

Finally, the container body 2 is removed from the mold, the lid 3 is placed over the container body 2, and the lid 3 and the container body 2 are thermally welded at the expanded portion 6 to form a barrier container 1 (FIG. 1). Production will be discontinued.

〔Effect of the invention〕

Since the present invention is structured as described above, it is possible to form a container with a deep bottom that has excellent barrier properties even at the bottom, and by printing on the barrier film in advance, printing that does not cause the risk of peeling off on the container can be achieved. This has the effect of making it possible to apply

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a barrier container according to the present invention, and FIG.
The figure is a cross-sectional view showing the structure of the barrier film, FIG. 3(a) is a plan view showing a cut piece of the barrier film, and FIG. 3(b) is a plan view showing a cut piece of the barrier film with one end bent. , Fig. 4 is a cross-sectional view showing the state in which the cut piece is wrapped around the shaft, Fig. 5 is a longitudinal cross-sectional view showing the state in which the cut piece is wrapped around the shaft, and Fig. 6 is a cross-sectional view showing the state in which the cut piece is wrapped around the shaft. Sectional view showing the state, No. 7
The figure is a perspective view showing the barrier film body, Figure 8 is a cross-sectional view showing a state in which the barrier film body is covered with a molding male mold, and Figure 9 is a cross-sectional view showing a state in which a certain-shaped male mold and a molding female mold are combined. , Fig. 10 is a sectional view showing the container body, Fig. 1l is a perspective view showing a circular blank cut out from the barrier film, Fig. 12 is a perspective view showing the barrier film molded product, and Fig. 3 is a conventional one. FIG. DESCRIPTION OF SYMBOLS 1... Barrier container, 2... Container body, 3... Lid body, 7, 18... Barrier film body, 14... Bottom forming body, 19... Molded male mold, 20...・・Molding female mold, 21・・
·cavity.

Claims (1)

[Scope of Claims] 1. A cylindrical barrier film body whose bottom portion is formed by combining a pre-formed bottom molded body on the bottom of a barrier film formed in a cylindrical shape with both ends open; A barrier container characterized by having a container body integrally molded with injection resin so that a barrier film forms the inner surface of the container. 2. Form a cylindrical barrier film having a bottom by combining a barrier film formed in a cylindrical shape with both ends open and a pre-formed bottom molded body, and cover the male mold with this barrier film body;
A molded male mold and a molded female mold covered with this barrier film body are combined to form a cavity, and a molded resin is injected into this cavity to form a container body so that the barrier film body covers the inner surface of the container body. A method for producing a barrier container characterized by integrally molding.