JPH11272172A - Label for metal can and metal can fitting same metal can label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the label for a metal can which gives superior external decoration with metallic luster to the external surface of the body part of the metal can and the metal can fitting the metal can label. SOLUTION: The label comprises a label base material 11 formed of a heat- resisting synthetic resin film which hardly shrinks at a heating temperature when heated to be adhered to the can body of the metal can, and a print layer 12, an anchor coat layer 13, a metal vapor-deposited layer 14, and an adhesive layer 15 stacked in order on one surface of the label base material 11. The anchor coat layer 13 and adhesive layer 15 are formed of thermosetting resin compositions and the thermosetting temperature of the anchor coat layer 13 is set lower than that of the adhesive layer 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal can label which is heated and adhered to a metal can, and a metal can provided with the metal can label, and in particular, a metal can label having a metallic luster and an appearance decoration. And a metal can provided with the metal can label.

[0002]

2. Description of the Related Art Metal cans for packaging beverages such as soft drinks and beer and processed foods in a sealed state include a three-piece can composed of a can body, a can bottom and a can lid, and a can bottom and a can. 2. Description of the Related Art There are two-piece cans composed of a can body having a body integrally formed and a can lid. In recent years, there are many cases in which a plurality of steps are formed on a neck portion of a can body by performing neck-in processing. It has become to.

[0003] Such metal cans such as two-piece cans and three-piece cans are provided with a product name,
It is common for the manufacturer's name, design, and other exterior decorations to be applied by direct printing.

[0004]

However, since the outer peripheral surface of the body of a metal can (two-piece can) serving as a printing surface is usually curved in a cylindrical shape, printability is higher than that of general film printing. And it is difficult to obtain a beautiful finished state.

[0005] In particular, there are many problems when performing multi-color printing such as photographic printing which requires a precise process, and it is intended to provide an excellent external decoration to a metal can by printing directly on the outer surface of the body. Even had limitations.

For this reason, it has been tried to improve the decorativeness by attaching a shrink label to the body of a metal can.
In the neck-in processing portion and the like, there is a problem that shrinkage of the shrink label becomes uneven, and the upper end and lower end of the shrink label are distorted or torn, and the shrink label is peeled off from the metal can.

In addition, since the shrink label is not adhered to the body surface of the metal can, when the shrink label reaches the tightening portion, the strength of the tightening is reduced due to the presence of the non-adhered shrink label. There is an inconvenience, and to prevent such an inconvenience, 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 metal can will be exposed. On the contrary, there is a problem that the decorativeness is reduced.

Further, aluminum cans can be designed and colored by utilizing the metallic luster of the aluminum background by alumite treatment or the like. However, in the case of steel cans which are inferior in metallic luster compared to aluminum cans, However, as in aluminum cans, it was not possible to perform exterior decoration utilizing the luster of the background. For this reason, it has been tried to mount a shrink label having a metal vapor-deposited layer of aluminum or the like on a metal can.However, in such a shrink label having a metal vapor-deposited layer, the metal vapor-deposited layer becomes cloudy in a label shrinking portion. At present, it cannot be adopted because of the problem of loss of luster.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a metal can label capable of providing an excellent appearance decoration having a metallic luster on the outer surface of the body of the metal can and a metal can provided with the metal can label. Is to do.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a label for a metal can which is heated and adhered to a metal can, wherein the label substrate is formed of a heat-resistant synthetic resin film. And an anchor coat layer formed of a thermosetting resin formed on one surface side of the label base material,
An object of the present invention is to provide a metal can label including a metal vapor deposited layer laminated on the anchor coat layer, and an adhesive layer composed of a thermosetting resin laminated on the metal vapor deposited layer.

Since the metal can label constructed as described above is heated and adhered to the metal can, even if the metal can is subjected to a neck-in process or a tightening process after the label is attached, it can be treated like a shrink label. There is no inconvenience such as peeling or wrinkling of the label, and no shrinkage of the label causes clouding of the metal deposition layer and loss of gloss.

Further, in this metal can label, since the anchor coat layer is formed of a thermosetting resin, heat generated when the metal can label is heated and adhered to the metal can is heated.
The anchor coat layer is not softened. Therefore, there is no inconvenience such that the metal deposited layer is displaced with respect to the label base material due to the softening of the anchor coat layer, or the metal deposited layer loses its metallic luster due to distortion.

In particular, when the thermosetting temperature of the anchor coat layer is set lower than the thermosetting temperature of the adhesive layer, the anchor coat layer can be cured simultaneously with the heat bonding treatment of the label. Can be efficiently manufactured and mounted.

[0014] In the case of a metal can in which the metal can label is heated and adhered in a state of being wound around the peripheral surface of the body, even if the steel can is inferior in metallic luster, as in the case of an aluminum can,
Appearance decoration utilizing metallic luster can be applied.

[0015]

Embodiments will be described below with reference to the drawings. As shown in FIG. 1, this metal can label 10 is an exterior label that is heated and adhered to the body of a can body that constitutes a metal can such as canned coffee or canned beer. A label substrate 11 formed of a heat-resistant synthetic resin film that hardly shrinks at a heating temperature, and a printing layer 12, an anchor coat layer 13, and a metal deposition layer 14 sequentially laminated on one surface of the label substrate 11. And an adhesive layer 15.

As the label substrate 11, a film of a polyester-based resin such as polyethylene terephthalate having a thickness of 5 to 50 μm and having a heat resistance enough to withstand the heat when being heated and bonded to the body of the can body is used. In particular, it is desirable to use a biaxially stretched polyester film having a thickness of 9 to 25 μm.

The printing layer 12 is formed by forming characters or patterns on the entire surface or a part of the label substrate 11 by using a known printing technique such as gravure printing, flexographic printing, offset printing or the like. It is desirable to perform gravure printing using a heat-resistant ink such as a two-component curable ink containing a polyester urethane resin component.

The printing layer 12 may be formed on either the inside or the outside of the label substrate 11 in a state where the printing layer 12 is mounted on a metal can. In this embodiment, the printing layer 12 is formed on the inside of the label substrate 11. . When the printing layer 12 is formed outside the label substrate 11, it is desirable to provide an overcoat layer formed of a transparent varnish or the like in order to protect the formed printing layer 12.

The anchor coat layer 13 is composed mainly of a simple substance or a mixture of a thermosetting isocyanate resin, an epoxy resin, and a polyester resin. For example, the anchor coat layer 13 is mainly composed of a polyester resin and contains a thermosetting resin containing an isocyanate resin. It is formed of a curable resin composition, a resin composition in which an epoxy resin is mixed with such a thermosetting resin composition, or a resin composition in which a bisphenol-type epoxy resin and a resole-type phenol resin are mixed. The solution containing the thermosetting resin composition as a main component is coated on the print layer 12 using a technique such as gravure coating so that the dry film has a thickness of, for example, 0.3 to 3 μm. is there.

In the case where the printing layer 12 is partially formed on the label substrate 11, the anchor coating layer 13 is in direct contact with the label substrate 11 in a portion where the printing layer 12 is not formed. That is, when the printing layer 12 is formed outside the label substrate 11, the anchor coat layer 13 is directly laminated on the label substrate 11.

The metal-deposited layer 14 is formed by vacuum-depositing aluminum to a thickness of 300 to 1000 °. The metal-deposited layer 14 may be formed through a transparent colored ink layer so as to be visible from the outer surface of the label substrate 11. 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.

The adhesive layer 15 is formed of a single substance or a mixture of an epoxy resin, a phenol resin, an aminoplast resin, a polyester resin, a urethane resin, or the like, for example, an epoxy phenol resin or a polyester / isocyanate resin. A solution containing a thermosetting resin composition as a main component is coated on the metal deposition layer 14 using a technique such as gravure coating so that the dry film has a thickness of, for example, 1.5 to 20 μm. is there.

The thermosetting resin composition forming the anchor coat layer 13 withstands the thermosetting temperature of the thermosetting resin composition forming the adhesive layer 15, that is, the heat bonding temperature of the label. It has excellent heat resistance, and its own thermosetting temperature is kept lower than the thermosetting temperature of the adhesive layer 15.

The metal can label 1 constructed as described above
In order to manufacture a metal can equipped with a “0”, first, FIG.
As shown in (a), the surface-treated steel sheet is deep drawn and ironed to form a can bottom 21a and a cylindrical can body 21b.
(B) on the outer peripheral surface of the can body 21 in which
As shown in FIG. 7, the metal can label 10 is wound with the adhesive layer 15 positioned inside.

At this time, a double winding portion X in which the winding end portion is overlapped within a range of several millimeters is formed at the winding start end portion of the metal can label 10, so that the entire peripheral surface of the body of the can main body 21 is securely formed. After being covered with the metal can label 10, for example, 80
The metal can label 10 is adhered to the outer peripheral surface of the can main body 21 by thermocompression bonding using a heat roller or the like heated to about 180 ° C. Thereafter, the adhesive layer 15 is completely cured by heating with hot air at 100 to 200 ° C. for several seconds to tens of minutes to complete the bonding.

Next, as shown in FIG. 3 (a), neck-in processing is performed on the upper part of the can body 21 after the metal can label 10 is heated and adhered, and the diameter is reduced to one or more steps. The formed neck processing part 21c is formed.

The can body 21 subjected to the neck-in processing in this manner is shipped to a factory for manufacturing contents such as soft drinks, and after filling the contents into the can body 21, the can body 21 shown in FIG. As shown in FIG. 3, a separately prepared can lid 22 (FIG. 3)
(See (a)) is tightly integrated with the end of the neck processing portion 21c by a winding process to form a metal can 20 in a canned state. It should be noted that the can lid 22 is usually processed for forming a drinking port such as a pull tab 22a.

The metal can 20 formed as described above
Since the label 10 for a metal can provided with the printing layer 12 and the metal deposition layer 14 is heated and adhered to the outer peripheral surface of the can main body 21, neck-in processing is performed.
It is possible to easily provide a more precise and beautiful appearance decoration than conventional metal cans that print directly on the surface of a metal can.

Further, since the metal can label 10 is completely adhered to the surface of the can body 21, the metal can label 10 is extended to the winding portion so that the background of the can body 21 is not visible. Even in this case, it is possible to obtain the metal can 20 having excellent appearance decoration and good sealing performance without lowering the tightening strength.

Further, due to the presence of the metal deposition layer 14,
Since the metal can label 10 is provided with a metallic luster, the same metallic luster as that of an aluminum can can be imparted by being attached to a can main body 21 formed of a surface-treated steel plate or the like having a low metallic luster. In addition, unlike the conventional shrink label, there is no problem that the metal luster is lost due to cloudiness when shrinking, and the appearance decoration having the metal luster can be reliably applied to the steel can.

Further, since the anchor coat layer 13 is formed of a thermosetting resin composition having heat resistance enough to withstand the heat bonding temperature of the metal can label 10, the metal can label 10 is The anchor coat layer 13 is not softened by the heat generated when the adhesive coat 21 is bonded by heating.
Therefore, at the time of heat bonding, the metal deposition layer 14 laminated via the anchor coat layer 13 is not displaced with respect to the label base material 11, and the once applied metallic luster is reliably maintained. You.

Further, the thermosetting temperature of the anchor coat layer 13 is kept lower than the thermosetting temperature of the adhesive layer 15,
When the metal can label 10 is heated and adhered, the anchor coat layer 13 is also cured together with the adhesive layer 15, so that the anchor coat layer 13 is individually formed at the label manufacturing stage (after the anchor coat layer 13 is formed) or at the mounting stage. The production of the metal can label 10 and the
1 can be efficiently mounted.

In this embodiment, the thermosetting temperature of the anchor coat layer 13 is kept lower than the thermosetting temperature of the adhesive layer 15, but the same can be obtained by increasing the curing speed of the anchor coat layer 13. The effect can be obtained. The curing temperature and the curing speed of the anchor coat layer 13 may be substantially the same as the curing temperature and the curing speed of the adhesive layer 15, and in this case, heating from the outer surface side of the metal can label 10 may be performed. preferable.

In the above embodiment, a two-piece steel can formed of a surface-treated steel sheet has been described. However, it is needless to say that the invention can be applied to a normal DI can or an aluminum can.

In addition, by applying a metallic luster to the body of a film laminate can formed by drawing and forming a laminate material in which a polyester resin film is laminated on both surfaces of a steel sheet, decorative properties such as printing can be improved. As a technique, this metal can label 10 can be applied.

[0036]

As described above, the label for a metal can of the present invention has an anchor coat layer made of a thermosetting resin, a metal deposition layer, and an adhesive layer made of a thermosetting resin on one side of the label base material. Because it is provided and heat-bonded to the metal can, even if the metal can is subjected to neck-in processing or tightening processing after label mounting, inconvenience such as peeling or wrinkling like a shrink label Does not occur, the label substrate hardly shrinks, and when the label is heated and adhered, the metal deposition layer does not become cloudy and the metal luster of the label is not lost.

Therefore, by attaching the metal can label to a metal can having a poor metallic luster such as a steel can, it is possible to provide an excellent appearance decoration having a metallic luster.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a metal can label according to the present invention.

FIG. 2 (a) is a partially cutaway sectional view showing a can body as it is, and FIG. 2 (b) is a side view showing the can body with a metal can label attached.

FIG. 3A is a side view showing a can main body in a neck-in processed state, and FIG. 3B is a side view showing a metal can with a can lid attached to the can main body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Label for metal cans 11 Label base material 12 Printing layer 13 Anchor coat layer 14 Metal deposition layer 15 Adhesive layer 20 Metal can 21 Can main body 22 Can lid

Claims (4)

[Claims] 1. A label for a metal can which is heated and adhered to a metal can, comprising: a label substrate formed of a heat-resistant synthetic resin film; and a thermosetting layer formed on one side of the label substrate. A metal can label comprising: an anchor coat layer made of a thermosetting resin; a metal deposited layer laminated on the anchor coat layer; and an adhesive layer made of a thermosetting resin laminated on the metal deposited layer. 2. The thermosetting temperature of the anchor coat layer,
The metal can label according to claim 1, wherein the label is set lower than the thermosetting temperature of the adhesive layer. 3. A metal can to which the metal can label according to claim 1 or 2 is heated and adhered in a state of being wound on the peripheral surface of the body. 4. A metal can to which the metal can label according to claim 1 or 2 has been heated and adhered in a state of being wound on a peripheral surface of a body of a steel can.