JPH0852526A - Production of film covered metal can - Google Patents

Abstract

PURPOSE:To obtain the film covered can not having floating of film and excellent in external appearance by forming neck part while sticking heat shrinkable film on outside surface of a barrel and executing diameter reduction by heating part of barrel part. CONSTITUTION:Heat shrinkable film 2 is wound on the outside whole surface of barrel part 3 of can main body 1 and is stuck while activating thermosensitive adhesive with heat. The film 2 is provided with a printing layer having display of product name, etc., on one side of heat shrinkable film and is stuck on the barrel 3 by the thermosensitive adhesive layer arranged thereon. The film 2 uses polyethylene terephthalate, etc., which is uniaxially oriented so as to shrink in the peripheral direction of barrel part 3 by heating. In reducing while ironing with pressing a die heated from the upper outer face of barrel part 3, the film 2 is shrunk by heat and tightly stuck on the barrel part 3 to form a neck part 6. Thus, the film covered metal can not having wrinkle and floating of film excellent in external appearance is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a printed film-coated metal can filled with, for example, soft drink, beer and the like.

[0002]

2. Description of the Related Art Conventionally, as a metal can filled with a soft drink, beer or the like, a metal can whose surface is directly labeled with a brand name, a public notice, etc. has been used. However, printing directly on the can surface in this way is complicated in the printing process and requires large equipment,
It had the drawback of being expensive. Therefore, in recent years
Film-coated metal cans are often used in which the body of the can body is covered with a pre-printed film of synthetic resin or the like.

[Problems to be Solved by the Invention]

On the other hand, the lid portion of the metal can has the highest material cost in the entire can, and reducing the area of the lid body leads to cost reduction. For this reason, recently, a metal can that has been subjected to a diameter-reducing process usually called neck-in process is performed such that the upper part of the body of the metal can is squeezed to form a neck part to reduce the diameter of the lid part. Is manufactured.

However, in the case of a metal can covered with the above-described printed synthetic resin film, when such a diameter reduction process is performed, as shown in FIG. In the shape of the metal can 21, the surface film
22 can not follow, the film 22 is in a state of peeling from the metal can 21, resulting in wrinkles and scratches on the surface of the film 22,
There was a fatal problem that it could not be used as a product.

The present invention has been made in order to solve the above problems and provides a film-coated metal can having an excellent appearance without peeling or wrinkling of the film even in a neck portion having a reduced diameter. The challenge is to provide.

[0006]

MEANS FOR SOLVING THE PROBLEMS As a means for solving the above problems, the present invention provides a metal sheet 10.
Body part 3 and bottom part 4 are integrally molded, the heat-shrinkable film 2 is adhered to the outer surface of the body part 3, and the neck part 6 is formed by reducing the diameter while heating a part of the body part 3. Forming and forming the can body 1.

As another means, the metal sheet 10 is formed into a tubular shape to form a body portion 3, a heat-shrinkable film 2 is adhered to the outer surface of the body portion 3, and a part of the body portion 3 is further attached. The neck body 6 is formed by reducing the diameter while heating the
To form one.

Further, as another means, the metal sheet 10
A heat-shrinkable film 2 is adhered to one surface of the metal sheet 10, and the metal sheet 10 is attached to the cylindrical body 3 so that the film 2 is the outer surface.
Then, the neck portion 6 is formed by reducing the diameter of the body portion 3 while heating a part of the body portion 3 to form the can body 1.

[0009]

That is, since the body 3 of the can body 1 is covered with the film 2 having the heat shrinkability as described above, and the diameter of the body 3 is reduced while heating a part of the body 3, the diameter reduction is performed. At the neck portion 6 formed by applying the
Shrinks by heating to follow the shape of the neck portion 6. Therefore, the film 2 is not peeled off from the main body 1 of the can and the wrinkles are not generated at the neck portion 6.

[0010]

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

Example 1 First, the structure of the film-coated metal can of the present invention will be described. Reference numeral 1 shown in FIG. 1 is a can body made of aluminum and filled with a soft drink 13 therein. The can body 1
Has a tubular body 3 and a bottom 4 which are integrally formed, and the body 3
As shown in Fig. 2, the upper surface of the upper part of the body 3 and the lid 5
The lid 5 is formed by the winding process in which the peripheral edge of the
Is attached.

Reference numeral 2 is a film mounted on the body portion 3 of the can body 1. The film 2 is, as shown in FIG.
Heat shrinkable film layer 7 made of a film having heat shrinkability obtained by uniaxially stretching polyethylene terephthalate
And a print layer 8 on which one side of the heat-shrinkable film layer 7 is printed, such as a product name, by gravure printing or the like. A heat-sensitive adhesive is applied to the entire surface of the printed layer 8 of the film 2 to form an adhesive layer 9, and the adhesive layer 9 is provided.
The film 2 is closely attached to the body 3 of the can body 1 via the.

The upper portion of the body portion 3 of the can body 1 is tapered to form a neck portion 6, and the film 2 has a neck portion 6 as shown in FIGS. It is mounted in close contact with the body portion 3 of the can body 1 over the entire length.

Next, a soft drink having such a constitution
A method for producing the film-covered metal can body 12 containing 13 will be described.

First, a sheet-shaped metal as shown in FIG.
10 is deep-drawn to form a can body 1 having a bottom portion 4 and a tubular body portion 3 from the metal sheet 10 as shown in FIG.

Next, a sheet-shaped film 2 having heat shrinkability is wound around the entire outer surface of the body portion 3 of the can body 1, and the heat-sensitive adhesive is activated by heat and bonded. This film 2 is formed by providing a printed layer 8 on the one side of which a heat-shrinkable film layer 7 having heat-shrinkability is provided with an indication of a trade name and the like, and a heat-sensitive adhesive is further formed on the upper surface of the printed layer 8. The applied adhesive layer 9 is provided, and the film 2 is adhered to the body portion 3 of the can body 1 through the adhesive layer 9 (see FIG. 4B).

The heat shrinkable film layer 7 of this film 2 is
When heated to about 70 ° C to 100 ° C,
It is formed from a heat-shrinkable film such as polyethylene terephthalate that is uniaxially stretched so as to shrink in the circumferential direction of the body 3.

Further, as shown in FIG. 4C, while the heated die 11 is pressed against the outer surface of the upper end of the body 3 of the can body 1, the upper end of the body 3 is reduced in diameter. A neck portion 6 is formed on the surface 3.

At this time, the heat of the die 11 also causes the heat-shrinkable film layer 7 of the film 2 to shrink in the circumferential direction, so that the neck portion 6 is formed while the film 2 follows and closely adheres to the body portion 3 whose diameter is reduced. be able to.

Next, soft drink water is filled into the can body 1 which has been reduced in diameter and covered with the film 2, and the upper end of the body 3 and the peripheral edge of the disk-shaped lid 5 are aligned. The lid body 5 is attached to the body portion by a winding process in which the lid body 5 is wound outward. In this way, the soft drink as shown in FIG.
A film-coated metal can 12 filled with 13 is formed.

In Example 1, the heat-sensitive adhesive was used as the adhesive for bonding the film 2 to the metal sheet 10, but the adhesive is not limited to the heat-sensitive adhesive.

Example 2 Next, a method of manufacturing a film-coated metal can by another method will be described.

First, as shown in FIG. 5A, the film 2 in which the print layer 8 is provided on the heat-shrinkable film layer 7 which is uniaxially stretched and has the heat-shrinkability similar to the above-mentioned Example 1 is printed. It is adhered to the entire surface of the metal sheet 10 via the adhesive layer 9 provided on the entire upper surface of.

Next, as shown in FIG. 5B, the metal sheet 10 is formed into a tubular shape so that the film 2 is on the outer surface, and the body portion 3 of the can body 1 is formed. The upper end portion and the lower end portion of the tubular body portion 3 are reduced in diameter while heating to form the neck portion 6 as in the first embodiment.

Further, as shown in FIG. 5C, the bottom portion 4 is attached to the bottom surface of the body portion 3 on which the neck portion 6 is formed by a winding process to form the can body 1, and the inside of the can body 1 is formed. After filling an object to be filled such as soft drink 13 with the like, the lid 5 is attached to the upper surface of the body 3 by a winding process.

At the time of this winding process, the film 2 is entirely covered up to the upper end and the lower end of the body 3, so that the film 2 is also wound together with the body 3, the lid 5 and the peripheral portion of the bottom 4. To be done.

In this way, a film-covered metal can in which the body 3 is covered with the film 2 and the can body 1 is filled with the object to be filled is formed.

In the second embodiment, the film 2 is adhered to the metal sheet 10 to form a tubular body, and the body is reduced in diameter, and then the bottom 4 and the lid are provided at the upper and lower ends of the body 3, respectively. Body 5
In addition to the above, the can body 1 was formed, but in addition to this, the metal sheet 10 was formed on the tubular body 3, and the body 3 was formed on the body 3.
Even if a film made of a heat-shrinkable film similar to the above is wound, and then a diameter reducing process for forming the neck portion 6 is performed, then the bottom portion 4 and the lid body 5 are attached to form a film-coated metal can. Good.

[0029] Other embodiments In the above embodiments has formed the tapered neck portion 6 by diametral reduction to the upper and lower ends of the body portion 3, Fig. 6
A multi-stage neck 6a including a plurality of steps may be formed as shown in FIG.

In each of the above embodiments, the film 2 covers the entire surface of the body 3 of the can body 1.
For example, the film 2 does not have to be covered in the vicinity of the upper end of the body 3 to which the lid 5 and the bottom 4 are attached, and the point is that the film 2 is covered with the neck 6 formed by the diameter reduction process. Of.

Furthermore, in each of the above embodiments, polyethylene terephthalate was used as the heat-shrinkable film layer 7 of the film 2. However, a heat-shrinkable film made of polypropylene or the like may be used. Any film may be used as long as it has a property of contracting in the circumferential direction when mounted and heated.

In each of the above embodiments, aluminum was used as the material of the can body 1, but other metals such as steel, which can be used as the material of the metal can, are not limited to the above embodiments. is not.

Further, in each of the above-mentioned embodiments, the metal can filled with the soft drink 13 has been described. Any kind of liquid such as liquid may be used, and the kind of the object to be filled is not limited to the above embodiment.

In each of the above-mentioned embodiments, the lid 5 and the bottom 4 are attached to the body of the can body 1 by the winding process, but other than this, the body 3 can be attached by any attachment method such as welding or adhesion. The lid 5 and the bottom 4 may be attached.

[0035]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, a heat-shrinkable film, which has been previously printed, is attached to a metal can to form a film-coated metal can. Even in such a case, the heat-shrinkable film is also shrunk by heat during the diameter-reducing process, and the neck portion having the reduced diameter is also attached in a close contact state. Therefore, it is possible to manufacture a film-coated metal can having an excellent appearance, which does not cause wrinkling or film floating even when the diameter of the body of the metal can is reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a film-coated metal can according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of part A in FIG.

FIG. 3 is an enlarged sectional view of a B part in FIG.

4A is a sectional view showing a metal sheet, FIG. 4B is a sectional view showing a state in which a heat-shrinkable film is attached to a deep-drawn metal sheet, and FIG. 4C is an explanatory sectional view showing a diameter reduction processing step. .

5A is a cross-sectional view showing a state in which a film is adhered to a metal sheet, FIG. 5B is a perspective view showing a state in which the metal sheet is formed into a tubular shape, and FIG. 5C is a state in which the lid and the bottom are attached. FIG. 3 is an enlarged cross-sectional view of a main part showing a closed body part.

FIG. 6 is a cross-sectional view of a film-coated metal can of another example.

FIG. 7 is an enlarged cross-sectional view of a main part of a conventional film-coated metal can.

[Explanation of symbols]

 1 Can Main Body 2 Film 3 Body 5 Lid 6 Neck 10 Metal Sheet

Claims (3)

[Claims] 1. A metal sheet (10) to body (3) and bottom (4)
Is integrally molded, the film (2) having heat shrinkability is adhered to the outer surface of the body (3), and the neck portion (6) is subjected to diameter reduction while heating a part of the body (3). Forming the can body (1)
A method for producing a film-coated metal can, comprising: 2. A film having a body portion (3) formed by cylindrically forming a metal sheet (10), and having a heat-shrinkable outer surface of the body portion (3).
(2) is bonded, and the neck portion (6) is formed by reducing the diameter while heating a part of the body (3) to form the can body (1). Metal can manufacturing method. 3. A film (2) having heat shrinkability is adhered to one surface of the metal sheet (10), and the metal sheet (10) is formed into a film.
Form as a cylindrical body (3) so that (2) is the outer surface,
Further, the neck portion (6) is formed by reducing the diameter of the body portion (3) while heating a part of the body portion (3) to form the can body (1), which is a method for producing a film-coated metal can.