JPH11157545A - Can main body for two-piece can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a can main body for a two-piece can, in which the decoration of various beautiful appearances can be effected on the surface of a can body irrespective of a shape of the can body or a forming material. SOLUTION: A label 3 having a four-layer structure comprising a printing layer 9, a metal vapor deposition layer 11 and a bonding layer 10, which are formed on a base film 8, is wound around and baked to adhere to a can body 2 formed unitarily with a can bottom. Thereafter, the can body 2 around which the label 3 is wound, and to which the label 3 adheres, is subjected to a neck-in processing to form a neck-processed part, thereby constituting a can main body for a two-piece can.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a can body for a two-piece can in which a can bottom and a can body are integrally formed, and more particularly to a two-piece can having an excellent outer appearance on its outer peripheral surface. Related to the can body.

[0002]

2. Description of the Related Art In recent years, a steel or aluminum two-piece can composed of a can body integrally formed with a can bottom and a can body and a can lid is subjected to neck-in processing to form a can body. The number of steps formed on the neck is increasing, and the can body of such a two-piece can has a brand name of a soft drink or beer to be filled, a manufacturer name,
It is common to apply a neck-in process after the design and other appearance decorations are printed.

[0003]

However, since the outer peripheral surface of the can main body is curved in a cylindrical shape, the printability is poor as compared with general film printing, and it is difficult to obtain a beautiful finished state. In particular, when performing multicolor printing such as photographic printing which requires a precise process, there are many problems, and there has been a limit in providing excellent appearance decoration to a two-piece can.

For this reason, it has been attempted to enhance the decorativeness by attaching a shrink label to the can body after the neck body is subjected to neck-in processing. Due to shrinkage, there is a problem that the label is distorted at the upper end or lower end, or the label is peeled off due to tearing.

Further, since the shrink label is not adhered to the surface of the can body, when the shrink label reaches the winding portion, there is an inconvenience that the strength of the tightening is weakened by the presence of the non-adhered shrink label. was there. In order to prevent such inconveniences, it is conceivable to set the shrink label short so as not to reach the tightened part, but if this is done, the surface of the body of the can is exposed, and conversely, the decoration There is a problem that the performance is reduced.

In addition, aluminum cans may be designed and colored by utilizing the metallic luster of the aluminum background by alumite treatment or the like. However, steel cans are inferior to aluminum cans in terms of metallic luster. However, unlike the aluminum can, it was not possible to make an appearance decoration utilizing the gloss of the background. For this reason,
Attempts have also been made to attach a shrink label having a metallized layer of aluminum to a steel can. However, there is a problem that it becomes cloudy and loses its luster, so that it cannot be adopted after all.

[0007] Therefore, an object of the present invention is to provide a two-piece surface which can be provided with various beautiful appearance decorations regardless of the shape and material of the can body such as a neck-in processed part. It is to provide a can body for a can.

[0008]

In order to solve the above-mentioned problems, the present invention relates to a method in which a label having a printed layer and an adhesive layer formed on a base film is provided around the entire circumference of a can body integrally formed with a can bottom. The present invention is to provide a can body for a two-piece can in which a neck portion of the neck portion of the can body to which the label is adhered is subjected to a neck-in process after being wound and adhered.

As described above, the can body for the two-piece can is curved because the label having the printed layer is wound around the can body and adhered to the surface of the can body to provide decoration. As compared with the case of printing directly on the surface of the can body, the external decoration of the can body can be more easily and beautifully finished.

[0010] Further, since the label is adhered to the surface of the can body, even if the label reaches the wound portion of the can lid, the strength of the tightening does not decrease, and the entire peripheral surface of the can body is covered. You can finish it neatly.

Further, since the label is to be baked and adhered to the surface of the body of the can, it is desirable to form the label with a biaxially stretched polyester film having excellent heat resistance. It is preferable to use an epoxy resin which can be firmly bonded to the can body.

When the can bottom and the can body are formed of steel, a label having a metal deposition layer formed between the printing layer and the adhesive layer is used.
Although it is an inexpensive steel can, it can be decorated with a design that makes use of metallic luster, like an aluminum can.

When the can bottom and the can body are formed of a laminated material in which a synthetic resin film is laminated on both sides of a steel plate, the adhesive surface of the label becomes a synthetic resin film. And the thickness of the adhesive layer on the label (the amount of adhesive applied) can be reduced.

In particular, the bottom part and the body part of the can are formed of a laminate material in which a polyester resin film is laminated on both sides of a steel plate, and the base film is formed of a biaxially stretched polyester film and the adhesive layer is formed. It is desirable to form a thermosetting resin composition having a polyester resin.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a schematic manufacturing procedure of a two-piece can.

First, as shown in FIG. 1 (a), a laminated steel sheet having a polyester film b adhered to both sides of a chromium-treated steel sheet (steel) a is deep drawn and ironed to form a recessed shape. The can bottom 1 and the cylindrical can body 2 are integrally formed.

Next, as shown in FIG.
The label 3 is wound on the outer peripheral surface of the substrate with the adhesive layer positioned inside. At this time, a double winding portion 4 is formed at the winding start end portion of the label 3 by overlapping the winding end portion within a range of several millimeters, so that the entire peripheral surface of the can body 2 is covered with the label 3 reliably. After that, the label 3 is put on the can body 2 by a heat roller or the like.
Baking and bonding to the outer peripheral surface of

Then, as shown in FIG. 2 (a), a neck-in process is performed on the upper part of the can body 2 after the label is baked and adhered, and the diameter of the neck processing unit is reduced to one or more steps. 5, and the can body A for a two-piece can is completed.

The can body A is shipped to a factory that manufactures contents such as soft drinks. After the contents are filled in the can body A, as shown in FIG. 6
(See FIG. 2A) is firmly integrated with the end of the neck processing portion 5 by a winding process to form a two-piece can B in a canned state. The can lid 6 is usually provided with a process for forming a drinking mouth such as a pull-top 7.

As shown in FIG. 3, the label 3 is formed by forming a printing layer 9 and an adhesive layer 10 on a base film 8, and
It has a four-layer structure in which a metal deposition layer 11 is formed between the printing layer 9 and the adhesive layer 10. The printing layer 9 has a product name, a manufacturer name, a design, etc. of contents to be filled in a can. Is partially applied so that the background metal deposition layer 11 can be visually observed.

The base film 8 has a thickness of 5 so as to withstand the heat generated when the label 3 is baked and adhered to the can body 2.
It is desirable to form a polyester-based or polyolefin-based film having heat resistance of 〜50 μm,
In particular, it is desirable to use a biaxially stretched polyester film having a thickness of 9 to 25 μm.

The printing layer 9 may be formed on either side of the inside or outside of the base film 8 in a state of being wound around the can body 2. In this embodiment, the printing layer 9 is formed inside the base film 8. It is. In the case where the printed layer 9 is formed outside the base film 8, it is desirable to provide an overcoat layer such as a transparent varnish to protect the printed layer 9. In addition, it is desirable to use a printing ink that is rich in heat resistance so as to withstand baking adhesion of the label 3.

The adhesive layer 10 is desirably formed of a thermosetting resin capable of firmly adhering to the surface of the can body 2, for example, an epoxy resin such as a bisphenol-type epoxy resin, a phenol resin, or a polyester resin. ,
Those containing a polyurethane-based resin or the like are exemplified.
Further, it is desirable that the thickness of the adhesive layer 10 is set to about 1 to 30 μm, and when the can surface is coated or in the case of a polyester film laminate can as in this embodiment, when it is directly adhered to the metal background (For example, about 1 to 15 μm).

In the case of a polyester film laminate can, the adhesive layer 10 is preferably formed of a thermosetting resin mainly composed of a polyester resin from the viewpoint of adhesiveness. Is preferred because excellent adhesion to polyester film laminate cans can be obtained.

The metal-deposited layer 11 is formed by vacuum-depositing aluminum to a thickness of 300 to 1000 °. The metal-deposited layer 11 may be formed through a transparent colored ink layer so as to be seen from the outer surface of the base film 8. it can. In addition,
As a base material to be vacuum-deposited, metals such as chromium, silver, and copper can be employed in addition to aluminum. When the printing layer 9 is formed on the inner surface side (the can body A side) of the base film 8, the metal deposition layer 11 is formed after the printing layer 9 is formed.
However, an anchor coat layer or the like for vapor deposition may be formed on the printing surface of the base film 8 or the printing layer 9.

As described above, in the two-piece can B, since the label 3 provided with the printing layer 9 is subjected to neck-in processing after being baked and adhered to the outer peripheral surface of the can body 2, a curved can body is formed. It is possible to easily provide a more precise and beautiful appearance decoration than conventional two-piece cans that print directly on the surface of a can.

Also, since the label 3 is completely adhered to the surface of the can body 2, even if the label 3 is extended to the tightened portion so that the background of the can body 2 is not visible, It is possible to provide a two-piece can having excellent appearance decoration and good sealing performance without lowering the tightening strength.

The label 3 having the metallized layer 11 formed between the printing layer 9 and the adhesive layer 10 is wound around the can body 2 so that an aluminum can is formed on the can body 1 made of a polyester film-laminated steel plate. Since the metallic luster is given, there is no problem that the metallic luster is lost due to white turbidity when shrinking unlike the conventional shrink label, and the appearance decoration utilizing the metallic luster can be reliably applied to the steel can. .

In the above-described embodiment, a two-piece can formed of a polyester film-laminated steel sheet has been described. However, it goes without saying that the present invention can be applied to a normal DI can or an aluminum can.

When a two-piece can is formed from a laminated steel sheet, a large amount of coolant (cooling / lubricating agent) does not need to be used as in the case of forming a conventional DI can. Since a process and a drying process are not required, and the waste generated in the process of manufacturing cans can be greatly reduced, the productivity can be improved and the environmental load can be significantly reduced.

[0031]

As described above, in the can body for a two-piece can according to the present invention, a pre-printed label is wrapped around the entire circumference of the can body and adhered, and then the can body is subjected to neck-in processing. Since it is applied, there is no inconvenience such as peeling or wrinkling like shrink labels, and beautiful designs and colors by film printing can be set freely. It becomes possible to finish the appearance decoration of the torso more beautifully.

[Brief description of the drawings]

FIG. 1A is a side view showing a can body as it is,
(B) is a side view showing the can main body with the label attached.

FIG. 2 (a) is a side view showing a can body in a completed state after neck-in processing, and FIG. 2 (b) is a side view showing a state completed as a two-piece can.

FIG. 3 is a sectional view showing a configuration of a label and a material of a can.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Can bottom 2 Can body 3 Label 8 Base film 9 Printing layer 10 Adhesive layer 11 Metal deposition layer A Can body a Steel plate b Polyester film

Claims (5)

[Claims] 1. A can body having a printing film and an adhesive layer formed on a base film wound around and adhered to the entire circumference of a can body integrally formed with a can bottom, and then the label is adhered to the can body. Body for 2-piece cans with neck-in processing applied to the neck of the part. 2. The can body for a two-piece can according to claim 1, wherein the base film is formed of a biaxially stretched polyester film, and the adhesive layer is formed of an epoxy resin. 3. The two-piece can for a two-piece can according to claim 1, wherein the can bottom and the can body are formed of steel, and a metal deposition layer is formed between the printing layer and the adhesive layer. The can body. 4. The can body for a two-piece can according to claim 1, wherein the bottom portion and the can body portion are formed of a laminated material in which a synthetic resin film is laminated on both surfaces of a steel plate. 5. The bottom of the can and the body of the can are formed of a laminated material in which a polyester resin film is laminated on both sides of a steel plate, and the base film is formed of a biaxially stretched polyester film and the adhesive layer is formed. The can body for a two-piece can according to claim 1, wherein the can body is formed of a thermosetting resin composition having a polyester resin.