JP2730956B2 - Container with metal lid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a container with a metal lid comprising a plastic container main body and a metal lid.

(Prior Art) There are various types of metal containers, for example, metal cans, which can be classified into three-piece cans and two-piece cans depending on the structure of the can body. The three-piece can is also called a tin solder can, and has a structure in which a cylindrical body, a lid, and a bottom are sealed by double winding. On the other hand, a two-piece can is also called a tin punched can, and has a structure in which a body and a bottom (container main body) are integrally formed and a lid is double-sealed.

These metal cans are used as containers for food cans, juices, soft drinks, jams, dried foods and the like as food packaging containers, and are rigid containers with particularly excellent sealing and storage functions. However, the metal can has the following points to be improved. That is, since it is a metal can, there is a limit to weight reduction.

Once impacted, once collapsed, there is no resilience and it will be deformed.

Energy costs in manufacturing are higher than those of plastic containers.

When the display effect of the container exterior is made of metal, it cannot be freely changed, and the exterior means is only by printing.

It is impossible to make a transparent container that allows the contents to be checked without opening the can.

In order to solve such a drawback of the conventional metal can, a container with a metal lid in which a metal lid is attached to a plastic container main body has been considered.

When a metal lid is attached to a plastic container main body, the peripheral edge of the metal lid is fastened around a flange portion of the container main body.

By the way, this plastic container body is generally
In order to prevent enzymatic gas, water vapor and the like from being mixed, a hot melt resin is often injected into a gas barrier sheet blank and molded.

In this case, the body and bottom of the container body are mainly formed of a gas-barrier sheet blank and the injected hot-melt resin, and the flange portion of the container body is mainly formed of the injected hot-melt resin.

(Problems to be Solved by the Invention) As described above, the container body is generally formed by injecting a hot-melt resin into a gas-barrier sheet blank.

In addition, the above-described gas-barrier sheet blank is a flat plate having a shape corresponding to the body and bottom of the container body before the container body is formed. For this reason,
When assembling the flat sheet blank into a three-dimensional shape to form the container body, a columnar gap is formed between the sheet blanks, and the gap is filled with the injected hot-melt resin. The portion filled with the hot-melt resin in this manner is a thicker columnar portion (pillar portion) than other portions of the container body, and is a portion having higher strength.

By the way, contents heated at a high temperature (for example, about 60 ° C.) may be stored in a container with a metal lid, and in this case, a high buckling strength at a high temperature is required for a plastic container body.

In such a case, if a plurality of the pillar portions described above can be formed in the plastic container main body, the buckling strength of the plastic container main body at a high temperature can be improved, which is convenient.

The present invention has been made in view of such a point, and an object of the present invention is to provide a container with a metal lid that can improve buckling strength by forming a plurality of columnar thick portions in a container body. And

[Configuration of the invention]

(Means for Solving the Problems) The present invention provides a metal lid including a plastic container main body having a bottom portion and a flange portion provided at an upper end opening, and a metal lid having a peripheral portion for winding the flange portion. In the attached container, the container body is formed from a gas-barrier sheet blank and a hot-melt resin injected onto the surface of the sheet blank, and the body portion of the container body has at least four thicknesses by the hot-melt resin. A container with a metal lid, wherein a meat pillar portion is provided, and the container body is configured to be divergent from a bottom portion to a flange portion.

(Operation) According to the present invention, since at least four thick pillars are provided in the container body that diverges from the bottom toward the flange, the buckling strength of the divergent container body that is easily buckled is provided. Can be increased.

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

1 to 5 are views showing one embodiment of a container with a metal lid according to the present invention.

In FIG. 1, a container 10 with a metal lid is a peripheral portion of a metal lid 11.
12 is wound around a flange portion 15 at the upper end opening of the plastic container body 14.

The metal cover 11 is made of aluminum or tinplate, and an inner surface of the metal cover 11 is coated with an epoxy resin in advance.

Next, the container body 14 of the container with a metal lid according to the present invention will be described with reference to FIGS.

The container body 14 includes a body 14a and a bottom 14b and a flange 15
And is formed in a divergent shape from the bottom portion 14b side to the flange portion 15 side. Of which, the trunk 14a and the bottom 1
4b is a sheet blank 26 with gas barrier properties and a sheet blank
It is made of thermoplastic resin 28 injected on the surface of 26,
The flange 15 is made of a thermoplastic resin.

A plurality of, for example, four pillar portions (thick columnar portions) 27 are formed on the body portion 14a, and a bottom edge portion 29 made of a thermoplastic resin 28 protrudes downward from the periphery of the bottom portion 14b. ing.

Next, the pillar portion 27 will be described in detail. The pillar portion 27 protrudes inward from the body portion 14a and is thicker than other portions of the body portion 14a. The pillar portion 27 includes a portion 27a formed by filling a gap between body sheet blanks 26a, which will be described later, with a hot-melt resin 28, and a portion 27b formed by hot-melt resin 28 4
), Which are thicker than other portions of the body portion 14a to increase the buckling strength of the container body 14. The four pillars 27a and 27b are disposed at substantially equal intervals in the circumferential direction. Of these, the pillar 27b is disposed at a position avoiding a later-described comb portion 26a of the sheet blank 26. ing.

Sheet blank 26 used for the container body 14 according to the present embodiment
May be any specification as long as it has a gas barrier structure including a thermoplastic resin coat. However, the thermoplastic resin 28 forming the injection molded product and the constituent resin on the thermoplastic resin 28 side of the sheet blank 26 must be the same or fused by heat. The basic configuration of the sheet blank 26 is as follows.
A laminated sheet of a thermoplastic resin configured as follows can be used in order from the outer surface to the inner surface of 14.

Polyethylene terephthalate / aluminum foil polypropylene (CPP) (dry lamination) Synthetic paper (PP) / aluminum foil / polypropylene (CPP)
(Dry lamination) Polyethylene terephthalate / vinylidene chloride copolymer / polypropylene (CPP) (Dry lamination) Polyethylene terephthalate / ethylene vinyl alcohol copolymer / polypropylene (CPP) (Dry lamination) Polypropylene (OPP) / Polyethylene extrusion coating paper / Aluminum foil / Polypropylene (CP
P) (Dry lamination) Polypropylene (OPP) / Polypropylene (CPP) / Polypropylene / Ethylene vinyl alcohol copolymer / Polypropylene co-extruded sheet (Dry lamination and heat lamination) The thickness of the above sheet blank 26 is anything from 100μ to 800μ May be.

The sheet blank 26 used in the present embodiment is a flat sheet formed by punching the laminated sheet into a shape as shown in FIG.

That is, the sheet blank 26 is attached to the bottom 14b of the container body 14.
And a trunk 14a of the container body 14 which is connected to the bottom sheet blank 26b and is connected to the bottom sheet blank 26b.
And a torso sheet blank 26a corresponding to.

Also, the torso sheet blank 26a and the bottom sheet blank 2
6b is connected by a comb portion 26c, and the sheet blank 26 is bent at the comb portion 26c and inserted into a mold.

Examples of the hot-melt resin 28 used for injection molding include polypropylene, polyethylene, polystyrene, polycarbonate, nylon, polyethylene terephthalate, and the like. Generally, any resin may be used as long as it is a thermoplastic resin. When injecting the hot-melt resin 28 into the inside of the sheet blank 26, the hot-melt resin 28 used for injection molding must be fused with the resin constituting the inner surface of the sheet blank 26 as described above. When the inner surface of the sheet blank 26 is polypropylene, polypropylene is selected, and when polyethylene terephthalate is selected as the hot-melt resin 28 for injection molding, the inner surface of the sheet blank 26 is preferably made of polyethylene terephthalate.

 Next, a method of manufacturing the container 10 with a metal lid will be described.

 First, a method for manufacturing the container body 14 will be described.

First, the sheet blank 26 is attached to the core 30 by being pulled through the vacuum hole 31 as shown in FIG. The core
30 has four longitudinal grooves 30a for forming the pillar portions 27 in advance.

In this case, the flat sheet blank 26 is assembled three-dimensionally, but two gaps are formed between the body sheet blanks 26a corresponding to the body 14a of the container body 14.

The sheet blank 26 attached to the core 30 is directly inserted into the cavity 17, and the hot-melt resin 28 is introduced from the gate 17a. The hot-melt resin 28 is injected onto the inner surface of the sheet blank 26 to form the body 14a, the bottom 14b, the flange 15, and the bottom edge 29. At the same time, the hot-melt resin 28 enters the vertical groove 30a of the core 30 and
Form 7. That is, the pillar portion 27a is formed at a portion corresponding to the two gaps between the trunk sheet blanks 26a by the longitudinal grooves 30a of the core 30, and the pillar portions 27b are formed on the trunk sheet blank 26a. Thus, the container body 14 is obtained.

Next, the contents 16 are stored inside the container body 14, and the container body
The peripheral edge portion 12 of the metal lid 11 is wound around the 14 flange portion 15.

According to the present embodiment, since four pillar portions 27 projecting inward and having a greater thickness than other portions are provided on the inner surface of the body portion 14a of the container body 14, the buckling strength of the container body 14 is improved. Can be done.

In the above embodiment, the example in which the container body is formed by injecting the hot-melt resin 28 onto the inner surface of the blank 26 has been described, but the hot-melt resin 28 may be injected onto the outer surface of the blank 26. . Further, a vertical groove 30a is provided on the core 30 side, and the pillar portion 27 is provided.
Although the example in which the protrusion protrudes inward from the body portion 14a is shown, a vertical groove may be provided on the cavity 17 side so that the pillar portion 27 protrudes outward from the body portion 14a. Further, the number of pillar portions 27 is not limited to four and may be five or more.

 Next, specific examples of the present invention will be described.

That is, a comparison of the buckling strength of the container body 14 when four pillar portions 27 are provided as in the present invention and when two pillar portions 27 are provided as in the conventional example is shown.

As apparent from this specific example, in the case of the present invention, a large buckling strength can be obtained.

〔The invention's effect〕

As described above, according to the present invention, at least four container bodies having a divergent shape from the bottom toward the flange are provided.
Since the thick pillar portion of the book is provided, the buckling strength of the divergent container body which is easily buckled can be increased. For this reason, it is possible to obtain a container with a metal lid that is hardly damaged even when dropped.

[Brief description of the drawings]

1 is a side sectional view showing an embodiment of a container with a metal lid according to the present invention, FIG. 2 is a perspective view of a container body, FIG. 3 is a view showing a sheet blank, and FIG. FIG. 5 is a side sectional view showing a structure, and FIG. 5 is a side sectional view showing a state in which a sheet blank is arranged between a core and a cavity. 10: Container with metal lid, 11: Metal lid, 12: Peripheral part, 14
... container body, 14a ... body, 14b ... bottom, 15 ... flange, 26 ... sheet blank, 26a ... body sheet blank, 26b ... bottom sheet blank, 27 ... pillar, 28 …… Heat-fusible resin.

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Kimiaki Momome 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd.

Claims (1)

(57) [Claims] 1. A container with a metal lid, comprising: a plastic container main body having a bottom portion and a flange portion provided at an upper end opening; and a metal lid having a peripheral portion for winding the flange portion. Is formed from a gas-barrier sheet blank and a hot-melt resin injected onto the surface of the sheet blank, and at least four thick-walled pillar portions are provided on the body of the container body by the hot-melt resin,
The container with a metal lid, wherein the container body is formed to have a divergent shape from a bottom portion to a flange portion.