JPH04367444A - container with metal lid - 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]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container with a metal lid, which includes a plastic container body and a metal lid.

0002

2. Description of the Related Art Metal containers, such as metal cans, have various shapes, but can be classified into three-piece cans and two-piece cans based on the structure of the can body. A three-piece can is also called a tin solder can, and has a structure in which the cylindrical body, lid, and bottom are sealed with double seams.

On the other hand, a two-piece can is also called a stamped tin can, and has a structure in which the body and bottom (container body) are integrally molded, and the lid is double-sealed.

These metal cans are used as food packaging containers for various canned foods, juices, soft drinks, jams, dried foods, etc., and are rigid containers with particularly excellent sealing and preservation functions. However, metal cans have the following points to be improved. That is, (1) Since it is a metal can, there is a limit to how much it can be reduced in weight. ■ Once it is crushed by an impact, it will not recover.
It becomes deformed. ■ Compared to plastic containers, the energy cost of manufacturing them is higher. ■ If the display effect of the container exterior is made of metal, it cannot be changed freely and the only means of exterior packaging is printing.

[0005] In order to solve these drawbacks of conventional metal cans, a container with a metal lid has been devised in which the peripheral edge of a metal lid is wrapped around the flange of a plastic container body.

[0006]

As mentioned above, as an alternative to metal cans, containers with metal lids have been considered in which the peripheral edge of a metal lid is wrapped around the flange of a plastic container body.

[0007] However, the seam portion formed by seaming the flange portion of the container body around the peripheral edge of the metal lid is weaker than the seam portion of a metal can because the plastic flange portion is used. Therefore, if a container with a metal lid falls during transportation, the plastic flange portion of the seaming portion may break or deform due to the weight of the contents.

[0008] The present invention has been made in consideration of these points, and an object of the present invention is to provide a container with a metal lid that can prevent breakage and deformation of the seamed portion.

[0009]

[Means for Solving the Problems] The present invention provides a plastic container body having a flange portion, a metal lid having a peripheral edge portion formed by seaming the flange portion to form a seaming portion, and a plastic container body that covers the metal lid. A container with a metal lid, comprising: a plastic protective cover attached thereto; a lower peripheral edge of the protective cover is bent inward in a radial direction, and the bent portion is engaged with the lower end of the seam. It is.

0010

[Operation] According to the present invention, the entire metal lid including the seaming portion consisting of the flange of the container body and the peripheral edge of the metal lid is covered with a plastic protective cover. The seaming part can be protected by this. Further, since the bent portion of the lower end periphery of the protective cover is engaged with the lower end of the winding, it is possible to prevent the protective cover from coming off.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 are diagrams showing an embodiment of a container with a metal lid according to the present invention.

In FIG. 1, a container 10 with a metal lid includes a plastic container body 11 having a flange portion 13, and a metal lid 16 having a peripheral edge portion 17 around which the flange portion 13 is wrapped. Note that the portion where the flange portion 13 of the container body 11 is wrapped around the peripheral edge portion 17 of the metal lid 16 is the portion where the flange portion 13 of the container body 11 is wrapped around the peripheral edge portion 17 of the metal lid 16.
becomes.

The container body 11 of the container with a metal lid has a cylindrical body 12a having an opening at the top and a bottom 12b, and the flange 13 projects radially outward from the periphery of the opening at the top of the body 12a. ing. Moreover, on the top surface of the metal lid 16,
An easy open line 15 is provided at a location located inside the seaming portion 18. The easy open line 15 is formed in a circular shape on the upper surface of the metal lid 16.
By pulling the pull tab 14 fixed to the top surface of the
The metal lid 16 is broken along the easy open line 15.

Further, above the metal lid 16, a seaming portion 18 is provided.
A plastic protective cover 20 is attached to cover the entire metal lid 16 including the metal lid 16. The protective cover 20 is a metal lid 16
The cover body 21 has a cover body 21 located above the cover body 21, and an extension part 22 extending downward from the peripheral side of the cover body 21. The lower end peripheral edge of the extension part 22 is bent inward in the radial direction to form a bent part 23, and this bent part 23 is a winding formed by the flange part 13 of the container body 11 and the peripheral part 17 of the metal lid 16. It engages with the lower end of the tightening part 18. Further, the cover body 21 is provided with a plurality of apertures 24 for discharging steam.

Next, the materials of each part will be explained in detail. first,
The metal lid 16 is made of aluminum, and its front and back surfaces are coated with a coating material.

Further, the container body 11 is formed from a laminated material having gas barrier properties. The layer structure of such a laminated material is, for example, polypropylene (PP)/adhesive/ethylene-vinyl alcohol copolymer (EVOH)/adhesive/polypropylene (PP), polystyrene (PS)/adhesive/ethylene-vinyl alcohol. Copolymer (EVOH
) / Adhesive / Polystyrene (PS), polyethylene terephthalate (PET) / Adhesive / Ethylene-vinyl alcohol copolymer (EVOH) / Adhesive / Polyethylene terephthalate (PET), Polyethylene terephthalate (PET) / Polyarylate / Polyethylene terephthalate (PET), polybutylene terephthalate (PBT)
) / Adhesive / Ethylene-vinyl allyl copolymer (EV
OH)/Adhesive/Polybutylene terephthalate (PBT
), polycarbonate (PC)/polyethylene terephthalate (PET)/polycarbonate (PC), polypropylene (PP)/adhesive/ethylene-vinyl alcohol copolymer (EVOH)/adhesive/polyethylene terephthalate (PET).

[0017] Further, as an adhesive, for example, ethylene vinyl acetate copolymer is used.

Further, the container body 11 is obtained by thermoforming the above-mentioned laminate by general sheet forming as shown in FIG.

That is, as shown in FIG. 2, a laminated material 30 having the thickness necessary for forming a container and having the above-described layer structure is preheated by a heating machine 41, and then molded using a mold 42 using a general molding method. A molded product 25 consisting of a plurality of container bodies 11 is molded by this method. The molding method may be air pressure molding, vacuum molding, or a combination thereof.

Next, the container bodies 11 constituting the molded product 25 are separated one by one, and then the flange portion 13 of the container body 11 is separated.
The container body 11 is obtained by reducing the thickness of the flange portion 13 (pressing step) and setting the width of the flange portion 13 to a predetermined width (cutting step).

The protective cover 20 is made of, for example, polyethylene and its copolymers, polypropylene, polystyrene and its copolymers, vinyl chloride resin and its copolymers, or polyester resin.

Further, the material of the protective cover 20 has an Izod impact strength of 1 to 100 kg·cm/cm. Note that the protective cover 20 may be formed by injection molding or vacuum-pressure molding.

Next, a method for manufacturing a container with a metal lid will be explained.

First, the high-temperature contents 19 are stored in the container body 11 configured as described above, and then the peripheral edge 17 of the metal lid 16 is tightened around the flange portion 13 of the container body 11. 18 is formed. Next, a protective cover 22 is attached to cover the metal lid 16. In this case, the bent portion 23 of the protective cover 20 engages with the lower end of the seaming portion 18 to prevent the protective cover 20 from coming off.

In use, first, the folding portion 23 and the seaming portion 18 are disengaged and the protective cover 20 is removed. Next, pull the pull tab 16 to break the metal lid 16 along the easy-open line 15. After that, protect cover 2 again.
0 is mounted on the metal lid 16, and the container 10 with the metal lid is inserted into a microwave oven and heated. In this case, container with metal lid 1
Steam from the contents 19 within the 0 is vented outwardly through the apertures 24. Thereafter, the protective cover 20 is removed from the metal lid 16 and the contents 19 are taken out.

According to this embodiment, the seaming portion 18 formed by wrapping the flange portion 13 of the container body 11 with the peripheral edge portion 17 of the metal lid 16 is covered by the cover body 21 and the extension portion 22 of the protective cover 20. Therefore, even if the container 10 with a metal lid falls, the protective cover 20 protects the seaming part 18.
can be protected. Therefore, in the seaming portion 13,
In particular, the plastic flange portion 13 can be prevented from breaking or deforming.

[0027]

[Effects of the Invention] As explained above, according to the present invention,
If the container with a metal lid falls, the protective cover can protect the seaming part. Therefore, the plastic flange portion of the seaming portion will not break or deform. Further, since the bent portion of the lower end periphery of the protective cover is engaged with the lower end of the winding, it is possible to prevent the protective cover from coming off.

[Brief explanation of drawings]

FIG. 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 diagram showing a process of manufacturing a molded product of a container body by thermoforming by sheet forming.

[Explanation of symbols]

10 Container with metal lid 11 Container body 13 Flange part 16 Metal lid 17 Peripheral area 18 Sealing section 20 Protective cover 23 Bending part

Claims (2)

[Claims] Claim 1: A plastic container body having a flange portion, a metal lid having a peripheral edge portion formed by wrapping the flange portion to form a seaming portion, and a plastic protective cover attached to cover the metal lid. A container with a metal lid, characterized in that a lower end peripheral edge of the protective cover is bent radially inward, and this bent portion is engaged with the lower end of the seam. 2. The container with a metal lid according to claim 1, wherein the protective cover has a plurality of openings.