JPH0839729A - Metal can and its production - Google Patents

Abstract

PURPOSE:To impart a special decoration with a three-dimensional feel and a depth to an outer surface of a can body part. CONSTITUTION:In a metal can, a protective coating layer is formed by bonding a synthetic resin film 4 to an outer surface of a can body part 3. A recessed and projected shape 7 is formed on an outer surface of the protective coating layer through a thermosetting adhesive layer 8a. In the production of the metal can, the film 4 is contact bonded to a preheated can-forming material 1 through the thermosetting adhesive layer 8a by a contact bonding roll 11, whereby the recessed and projected shape 7 is formed on the outer surface of the film 4 before completion of adhesion of the thermosetting adhesive layer 8a, and thereafter the film 4 is thermally cured and bonded to the can-forming material 1. The contact bonding roll 11 provided with a recessed and projected shape 10 on its contact bonding surface forms the recessed and projected shape 7 simultaneously when contact bonding the film 4. Alternatively, an embossing roll provided with a recessed and projected shape 10 on its film-contact surface is disposed downstream of the contact bonding roll 11 to form the recessed and projected shape 7 immediately after the film 4 is contact bonded by the contact bonding roll.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal can body having a protective coating layer formed by adhering a synthetic resin film to at least the metal surface of the outer surface of the can body through a thermosetting adhesive layer. It relates to a manufacturing method.

[0002]

2. Description of the Related Art Conventionally, as metal cans used in containers for beverages, tin-coated steel plates or tin-free steel plates, etc. A so-called three-piece metal can body is known in which a can body is formed by welding or adhering and joining the can body, and separately manufactured can lids are double-wound into openings at both ends of the can body. Has been.

Further, a can lid, which is separately manufactured, is double-wound onto the opening of a bottomed cylindrical can body having an opening on one side formed by drawing and ironing from an aluminum alloy plate for a can or the like. A so-called two-piece metal can body is known.

In such a metal can body, a polyester film is heat-bonded to the outer surface of the body of the can through a thermosetting adhesive layer to reinforce the metal body or scratch the outer surface of the body of the can. To prevent external damage, and to add a cosmetic property to the outer surface of the body of the can by interposing a printing layer with a predetermined pattern between the transparent polyester film and the thermosetting adhesive layer. I am.

By the way, in recent years, it has been studied to provide a new cosmetic property to the outer surface of the can to enhance the quality and differentiate the can. For example, the outer surface of the can body covered with the polyester film has an uneven shape. It is desired that the outer surface of the can body portion be provided with a three-dimensional effect and a depth by imparting a special cosmetic property that has never existed.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and a metal can body capable of imparting a special cosmetic property with a three-dimensional effect and depth to the outer surface of the can body, and the same. It is intended to provide a manufacturing method.

[0007]

In order to achieve such an object, the present invention provides a protective coating layer by adhering a synthetic resin film to at least a metal surface on the outer surface of a can body through a thermosetting adhesive layer. In a metal can body formed by forming the protective coating layer on the outer surface side, the thermosetting adhesive layer and the synthetic resin film are provided with an uneven shape formed by press molding. To do.

In this case, a transparent synthetic resin film is used, a printing layer is provided between the synthetic resin film and the thermosetting adhesive layer, and a pressure is applied to the outer surface side of the protective coating layer. It is preferable that the recesses formed by molding are provided along the contour of the printing layer.

The concavo-convex shape formed on the outer surface side of the protective coating layer is formed so that the step difference is 0.3 μm or more. If the step difference is less than 0.3 μm, it becomes difficult to visually recognize the uneven shape.

A polyester film having excellent strength is used as the synthetic resin film in order to protect the metal surface from external damage, but it is excellent in heat resistance to heat during thermosetting of the thermosetting adhesive layer. From the viewpoint, a polyethylene terephthalate film is preferable.

The synthetic resin film preferably has a thickness in the range of 5 to 25 μm. If the thickness of the synthetic resin film is less than 5 μm, the outer surface of the can body is easily scratched, and pinholes may occur. Further, when the thickness is thicker than 25 μm, it is difficult to form the uneven shape on the outer surface side of the protective coating layer. The synthetic resin film has a thickness of 5 to 20 μm in order to easily form an uneven shape on the outer surface side of the protective coating layer.
It is even more preferred to have a thickness in the range of m.

The thermosetting adhesive layer preferably has a thickness of 1 μm or more. The thickness of the adhesive layer is 1 μm
If it is less than the above range, sufficient unevenness may not be obtained, and sufficient adhesive strength may not be obtained between the synthetic resin film and the metal surface.

Further, the protective coating layer relaxes the residual stress of the synthetic resin film due to the heating, regulates the expansion and contraction of the film to improve the dimensional stability, and the scratch resistance to external damage, It is preferable to provide a transparent cured overcoat layer on the outer surface side of the can of the synthetic resin film. The cured overcoat layer is made of, for example, a resin containing an epoxy resin and an aminoplast resin, to which an organic acid or an inorganic acid such as phosphoric acid or polyphosphoric acid is added as a short-time curing catalyst. It is formed to a thickness in the range of 0 μm. If the thickness of the cured overcoat layer is less than 0.5 μm, the dimensional stability and scratch resistance may not be sufficiently obtained, and if it exceeds 2.0 μm, uneven shapes are formed on the outer surface side of the protective coating layer. It will be difficult.

The metal can of the present invention is a film pressure bonding method in which a synthetic resin film for forming a protective coating layer on the metal surface of a preheated material for forming a can is pressure bonded by a pressure bonding roll via a thermosetting adhesive layer. A step, a concavo-convex forming step of forming a concavo-convex shape on the outer surface side of the synthetic resin film before the thermosetting adhesive layer is completely bonded, and the concavo-convex shape by heat curing the thermosetting adhesive layer. It can be advantageously manufactured by a manufacturing method including a bonding step of bonding the formed synthetic resin film to the material for forming a can body.

In the above-mentioned manufacturing method, the pressure-bonding roll has an uneven shape on its pressure-bonding surface, and the synthetic resin film is pressure-bonded via a thermosetting adhesive layer, and at the same time, the uneven shape is formed on the outer surface side of the synthetic resin film. A corresponding shape may be formed. Further, an embossing roll having an uneven shape formed on the surface contacting the synthetic resin film pressure-bonded to the metal surface is provided downstream of the pressure-bonding roll by the pressure-bonding roll. Immediately after the pressure-bonding step, a shape corresponding to the uneven shape may be formed on the outer surface side of the synthetic resin film by the embossing roll.

In the manufacturing method, the pressure-bonding roll or the embossing roll made of an elastic body having an appropriate hardness is used to form the uneven shape on the synthetic resin film. If the hardness of the pressure bonding roll or the embossing roll is too low, the effect of forming the concavo-convex shape on the synthetic resin film may not be sufficiently obtained, and if it is too hard, the outer surface of the can body may be damaged. In the manufacturing method,
For example, the pressure-bonding roll or the embossing roll made of silicone rubber having a hardness of 70 is preferably used.

In the above-mentioned manufacturing method, when the synthetic resin film is transparent and a printing layer is interposed between the synthetic resin film and the thermosetting adhesive layer, the pressure roll or the pressure-sensitive adhesive roll is used. A convex portion having a shape along the contour of the printing layer is formed on the embossing roll, and a concave portion along the contour of the printing layer is formed on the outer surface side of the protective coating layer by the convex portion during the concave-convex forming step. It can also be done.

In the manufacturing method, the thermosetting adhesive layer may be provided on either the synthetic resin film or the can body forming material.

In the manufacturing method, the material for forming a can is
Also in the case of a can body forming metal plate for forming a can body by laminating and welding or adhering both end edges for a so-called three-piece can body, the so-called 2 formed from the can body forming metal plate is used.
It is also applied to the case of a bottomed cylindrical can body having an opening on one side for the piece can body. In the case of the metal plate for forming a can body for the three-piece can body, the protective coating layer is formed excluding portions used for welding or bonding of both end edges thereof, and has a bottom for the two-piece can body. The tubular can body is formed at least on the outer surface of the can body.

[0020]

According to the metal can of the present invention, since the outer surface of the protective coating layer is provided with an uneven shape by press molding, the uneven shape gives a three-dimensional effect and depth to the outer surface of the protective coating layer. .

In this case, a transparent synthetic resin film is used, a printing layer is provided between the synthetic resin film and the thermosetting adhesive layer, and a recess is formed on the outer surface of the protective coating layer. If you prepare along the contours of the layers,
The outer surface of the protective coating layer is provided with a composite aesthetic property due to the printing layer and the uneven shape, and further, the recesses make it possible to clarify the printed pattern.

By forming the uneven shape so that the step difference is 0.3 μm or more, the three-dimensional effect and depth due to the uneven shape can be well expressed on the outer surface of the protective coating layer.

By using a polyester film as the synthetic resin film, a protective coating layer having excellent strength for protecting the metal surface and the printed layer from external damage can be obtained. Further, by using the polyethylene terephthalate film, excellent heat resistance against heating during thermosetting of the thermosetting adhesive layer can be obtained.

The synthetic resin film has a thickness of 5 to 25 μm,
Preferably, by having a thickness in the range of 5 to 20 μm, irregularities can be easily formed on the outer surface side of the protective coating layer.

Further, the protective coating layer is provided with a transparent cured overcoat layer on the outer surface side of the can of the synthetic resin film, so that the dimensional stability and scratch resistance of the synthetic resin film are improved. The cured overcoat layer is 0.
By being formed to a thickness in the range of 5 to 2.0 μm,
The uneven shape is easily formed on the outer surface side of the protective coating layer.

Since the thermosetting adhesive layer has a thickness of 1 μm or more, an appropriate step is provided on the uneven shape formed on the outer surface of the protective coating layer.

According to the method for producing a metal can body of the present invention, first, a thermosetting adhesive layer is formed by pressing a synthetic resin film for forming a protective coating layer on the metal surface of a pre-heated can body forming material with a pressure roll. Crimp through. In this case, the thermosetting adhesive layer is provided on either the synthetic resin film or the can body forming material.

At this stage, since the thermosetting adhesive layer is not completely cured, the synthetic resin film is in a state of being temporarily adhered to the metal surface. Therefore,
Next, before the curing of the thermosetting adhesive layer progresses and the adhesion is completed, a concavo-convex shape is formed on the outer surface side of the synthetic resin film pressure-bonded to the metal surface.

Then, the thermosetting adhesive layer is heated and completely cured to bond the synthetic resin film having the uneven shape to the can body forming material,
A protective coating layer is formed on the metal surface of the material for forming a can body, in which the uneven shape is formed on the outer surface of the synthetic resin film.

The concavo-convex shape on the outer surface side of the synthetic resin film may be formed at the same time as the pressure bonding of the synthetic resin film, as long as the curing of the thermosetting adhesive layer proceeds and the adhesion is completed. For example, it may be performed immediately after pressure bonding of the synthetic resin film. In the manufacturing method, when the pressure-bonding roll has an uneven shape on its pressure-bonding surface,
At the same time when the synthetic resin film is pressure-bonded via the thermosetting adhesive layer, a shape corresponding to the uneven shape is formed on the outer surface side of the synthetic resin film. Further, when an embossing roll having a concavo-convex shape formed on the surface contacting the synthetic resin film pressure-bonded to the metal surface is provided downstream of the pressure-bonding roll, immediately after the pressure-bonding step by the pressure-bonding roll, the embossing roll A shape corresponding to the uneven shape is formed on the outer surface side of the synthetic resin film.

In the above-mentioned manufacturing method, by using the pressure-bonding roll or the embossing roll for forming the uneven shape made of silicone rubber, the uneven shape formed on the surface of each roll contacting the synthetic resin film, It is preferably transferred to the outer surface side of the synthetic resin film.

When the synthetic resin film is transparent and the printing layer is interposed between the synthetic resin film and the thermosetting adhesive layer, the pressure roll or the embossing roll is used. By forming a convex portion having a shape along the contour of the printed layer, a concave portion along the contour of the printed layer is formed on the outer surface side of the protective coating layer by the convex portion during the unevenness forming step. .

In each of the above-mentioned manufacturing methods, even when the material for forming a can body is a metal plate for forming a body of a can which is formed by welding or adhering both end edges to each other and welding or adhering them, It is also used in the case of at least the outer surface of the can body of a bottomed cylindrical can body formed of a metal plate and having an opening on one side, and metal is formed by winding a separately manufactured can lid at each opening end. A can body is obtained.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the metal can body and its manufacturing method of the present invention will be described in more detail with reference to the accompanying drawings. 1 is a perspective view showing an embodiment of a metal can body according to the present invention, FIG. 2 is an explanatory sectional view showing the structure of a material for forming a can body of the metal can body according to the present invention, and FIG. 3 is shown in FIG. 4 to 6 are explanatory sectional views showing an example of the manufacturing method shown in FIG. 3, and FIGS. 7 to 9 show other examples of the manufacturing method shown in FIG. Explanatory sectional view, FIG.
Is an explanatory sectional view showing another embodiment of the metal can body according to the present invention, and FIG. 11 is a flowchart showing a method for manufacturing the metal can body shown in FIG.

First, the first embodiment of the present invention will be described.

The metal can body of this embodiment is a cylindrical can body used to manufacture a three-piece can body, and as shown in phantom in FIG. 0.22
A can body 3 having a cylindrical shape and having openings at both ends is formed by rolling a metal plate 1 having a diameter of mm and overlapping and welding both end edges 2 and 2. As shown in FIGS. 1 and 2, a transparent polyester film 4 or 4 having a thickness of 12 μm is adhered to both sides of the metal plate 1 except both end edges 2 and 2 to form protective coating layers 5 and 5. There is.

As shown in FIG. 2, on the outer surface side of the metal plate 1, between the metal plate 1 and the protective coating layer 5, an epoxy butyral resin and a polyisocyanate resin are used, and printing containing an ordinary pigment is carried out. The layer 6 is formed to have a thickness of 1.0 μm, and as shown in FIG. 1, “ABC BEER, ABC CORP” is formed.
The design is drawn.

On the outer surface side of the protective coating layer 5, a star-shaped concave portion 7 having a step of 0.8 μm formed by pressing is formed.
Are provided so as to give a stereoscopic effect and depth to the visual impression on the outer surface side of the protective coating layer 5. The step is preferably 0.3 μm or more, and if the step is less than 0.3 μm, the shape of the recess 7 becomes difficult to visually recognize, and the visual impression is reduced.

Next, the laminated structure of the metal plate 1 is shown in FIG.
A description will be given according to (a). The metal plate 1 is provided with a printing layer 6 on the can body (metal plate 1) side of the polyester film 4 on the outer surface side of the can, and the polyester film 4 has a thickness provided between the printing layer 6 and the metal plate 1. It is adhered to the surface of the metal plate 1 through a thermosetting adhesive layer 8a having a thickness of 7 μm. On the inner surface side of the can, the polyester film 4 is adhered to the surface of the metal plate 1 through the thermosetting adhesive layer 8b having a thickness of 4 μm provided between the polyester film 4 and the metal plate 1, and the printing layer 6 is provided. Has not been done.

The thermosetting adhesive layer 8a contains 95% of epoxy resin and glycerol tris trimellitate anhydride.
It has a weight ratio of / 5, and contains 60% by weight of titanium oxide as a white pigment for concealing the metal base with respect to the resin component. On the other hand, the thermosetting adhesive layer 8b is made of a resin having the same composition as the thermosetting adhesive layer 8a, but does not contain a pigment. Also, the polyester film 4 on the outer surface side of the can is
A transparent cured overcoat layer 9 having a thickness of 1 μm is provided on the outer surface side thereof.

Next, a method for manufacturing the metal can body shown in FIG. 1 will be described.

In the present manufacturing method, first, in the step of forming the cured overcoat layer shown in FIG. 3, as shown in FIG. 4A, the thickness of the polyester film 4 on the surface opposite to the surface on which the print layer 6 is formed is increased. A transparent cured overcoat layer 9 having a thickness of 1 μm is formed.

Next, in the print layer forming step of FIG.
As shown in (b), a plurality of printing layers 6 (shown as a single layer for simplicity) are formed by, for example, gravure printing the resin containing a pigment on the surface of the polyester film 4 opposite to the cured overcoat layer 9. To have a dry film thickness of 1.0 μm.

Next, in the adhesive layer forming step of FIG.
As shown in (c), a thermosetting adhesive made of the resin is applied on the printed layer 6 to form a thermosetting adhesive layer 8a having a dry film thickness of 7 μm.

Next, in the film pressure bonding step of FIG.
As shown in (d), the polyester film 4 on which the cured overcoat layer 9, the printed layer 6 and the thermosetting adhesive layer 8a are formed is made of silicone rubber having a hardness of 70, and the shape of the recess 7 is formed on the pressure-bonding surface. By the pressure roll 11 on which the star-shaped convex portion 10 corresponding to
The metal plate 1 preheated to a temperature of ° C is pressure-bonded to the side of the outer surface of the can via the thermosetting adhesive layer 8a, and at the same time, the thermosetting adhesive layer 8a is heated by the heat of the metal plate 1. Cure and temporarily bond.

In the present manufacturing method, since the convex portion 10 is formed on the crimping roll 11 as described above, the concavo-convex forming step is performed simultaneously with the film crimping step of FIG. That is, at the same time when the polyester film 4 is pressure bonded, the shape of the convex portion 10 of the pressure roll 11 is transferred to the outer surface side of the polyester film 4, and the star-shaped concave portion 7 corresponding to the convex portion 10 is transferred.
Is formed.

When the polyester film 4 is pressure-bonded, the thermosetting adhesive layer 8a is, of course, before the bonding is completed. Therefore, when the polyester film 4 is pressed by the convex portion 10 and deformed into a concave shape, the deformation is accompanied. As a result, the thermosetting adhesive layer 8a is also pressed and the layer thickness of the thermosetting adhesive layer 8a between the polyester film 4 and the surface of the metal plate 1 becomes thin, and the thermosetting proceeds in this state. Then, a star-shaped concave portion 7 corresponding to the convex portion 10 is formed on the outer surface of the protective coating layer 5 formed of the thermosetting adhesive layer 8a, the polyester film 4 and the cured overcoat layer 9.

In the film pressure bonding step, at the same time,
The polyester film 4 is pressure-bonded to the side of the metal plate 1 which becomes the inner surface of the can by a pressure-bonding roll 12 having a smooth pressure-bonding surface, and is temporarily bonded. The polyester film 4 is a metal plate 1 separately.
The thermosetting adhesive layer 8b is applied to the side that is pressed against.

Next, in the bonding step shown in FIG. 3, the metal plate 1 is heated in an oven (not shown) at a temperature of 215 ° C. for 1 minute to cure the thermosetting adhesive layers 8a, 8b, The polyester film 4 having the concave portion 7 on the outer surface of the can and the polyester film 4 on the inner surface of the can are permanently bonded to the metal plate 1 to form the metal plate 1 having the configuration shown in FIG. To do.

Next, in the can body forming step of FIG. 3, the metal plate 1 is rounded as shown by phantom lines in FIG.
Are overlapped with each other and welded to form a can body portion 3 having openings at both ends. Since the welded portion of the can body portion 3 is not covered with the polyester films 4 and 4, after the welding, the coating correction is performed according to a conventional method.

Then, in the can body forming step of FIG. 3, a separately manufactured can lid is wound around one open end of the can body 3 according to a conventional method to form a metal can body, and the contents are filled. After doing
Further, a separately manufactured can lid is wound around the other open end to make a can.

In the present manufacturing method, various tin-plated surface-treated steel plates or tin-free steel plates for welding cans can be used as the metal plate 1.

The polyester film 4 adhered to the metal plate 1 to form the protective coating layer 5 may be any polyester as long as it is a polyester obtained by polycondensation of a dicarboxylic acid component and a diol component. When it is adhered to the outer surface of the can, strength for forming the printing layer 6 and dimensional stability against heat treatment when adhering to the metal plate 1 are required. Therefore, a heat-resistant polyester film such as polyethylene naphthalate, A uniaxially or biaxially stretched polyethylene terephthalate film or the like is preferable. In order to secure dimensional stability against the heat treatment, the polyester film has a physical property of 30 at 150 ° C.
The thermal shrinkage in the longitudinal direction when held for 1.2 minutes or less,
A biaxially stretched polyester film having a heat shrinkage ratio of 0% in the width direction is particularly preferable.

In order to secure the dimensional stability, the polyester film 4 is provided with a transparent cured overcoat layer 9 made of a thermosetting resin on the side opposite to the surface on which the printed layer 6 is provided. Preferably. By providing the cured overcoat layer 9, the residual stress of the polyester film 4 is relaxed, the expansion and contraction of the polyester film 4 is restricted, the dimensional stability is ensured, and the scratch resistance is improved. Also,
By providing the cured overcoat layer 9, the slipperiness of the polyester film 4 is improved.

The thermosetting resin forming the cured overcoat layer 9 is composed of, for example, an epoxy resin and an aminoplast resin so that a cured film can be formed at a high temperature in a short time. A resin to which an acid or an inorganic acid such as phosphoric acid or polyphosphoric acid is added is suitable. It is preferable that a silicon compound such as silicon oxide or wax is added to the thermosetting resin in order to improve slidability.

As the thermosetting adhesives 8a and 8b,
An adhesive comprising a resin containing an epoxy resin having a number average molecular weight of 5,000 to 20,000 and an acid anhydride curing agent in a weight ratio of 70/30 to 99/1, or a polyester resin and an aminoplast resin 70/30 to 90 Adhesives consisting of resins containing in a weight ratio of / 10 are suitable.

When the thermosetting adhesive comprises an epoxy resin and an acid anhydride-based curing agent, the epoxy resin has insufficient adhesive strength when the number average molecular weight is less than 5,000, and has high viscosity when it exceeds 20,000. Both are not preferable because the coating workability is poor. Further, when the number average molecular weight is less than 5,000, when the polyester film is coated and dried in advance to form an adhesive layer, the adhesive layer has high tackiness and a low tack-free property.

In the thermosetting adhesive, if the weight ratio of the epoxy resin to the acid anhydride-based curing agent exceeds 99/1, the curing of the epoxy resin is delayed during heating and pressure bonding by the pressure bonding roll 11 and the convex There is a possibility that the thermosetting adhesive layer 8a pressed by the portion 10 may return to the original thickness and the concave portion 7 may not be formed in the polyester film 4.
When it is less than / 30, the effect of accelerating the curing of the epoxy resin is not further improved.

Examples of the acid anhydride-based curing agent include curability,
A trimellitic anhydride-based curing agent composed of trimellitic anhydride or a derivative thereof is suitable because it is excellent in blocking resistance and tack-free property of the film after coating. Examples of the trimellitic anhydride derivative include glycerol tris trimellitate anhydride, trimeric anhydride dimer, and ethylene glycol bis trimellitate anhydride.

When the thermosetting adhesive is composed of polyester resin and aminoplast resin, the weight ratio thereof is 9
When it exceeds 9/10, the curing of the epoxy resin is delayed at the time of heating and pressure bonding by the pressure roll 11, and the thermosetting adhesive layer 8a pressed and deformed by the convex portion 10 returns to the original layer thickness, and the polyester film 4 is formed. There is a possibility that the concave portion 7 may not be formed, and if it is less than 70/30, the curing will proceed too much and the workability of the adhesive layer will deteriorate, which is not preferable. As the polyester resin, a known polyester resin may be used alone, or an epoxy-modified polyester resin modified with an epoxy resin or the like may be used. As the aminoplast resin, melamine resin, benzoguanamine resin, or the like can be used. Further, the thermosetting resin adhesive may use an epoxy resin together with the polyester resin and the aminoplast resin.

As the printing ink for forming the printing layer 6, a conventionally known printing ink can be used, but the polyester film 4 is sufficiently heated between the metal film 1 and the polyester film 4 at a high temperature for a short time. In order to obtain adhesive strength, it is preferably used selectively depending on the type of resin forming the thermosetting adhesive. The resin composition forming the printed layer 6 may include a pearl pigment, a metal powder for imparting a metallic color tone, and the like.

Next, a modification of the manufacturing method shown in FIG. 4 will be described.

In the present manufacturing method, first, in the adhesive layer forming step of FIG. 3, as shown in FIG. 5A, an adhesive made of the resin is applied to the side of the metal plate 1 which is the outer surface of the can. Then, a thermosetting adhesive layer 8a having a dry film thickness of 7 μm is formed. At this time, the curing overcoat layer forming step and the printing layer forming step of FIG. 3 are performed in the same manner as in the manufacturing method shown in FIG.
As shown in (b), a cured overcoat layer 9 is formed on the surface of the polyester film 4 opposite to the surface on which the printed layer 6 is formed, and then as shown in FIG. The printing layer 6 is formed on the side surface.

Next, in the film pressure bonding step of FIG.
As shown in (d), the can of metal plate 1 in which the polyester film 4 on which the cured overcoat layer 9 and the printing layer 6 are formed is preheated to a temperature of 150 to 180 ° C. by the pressure roll 11. The thermosetting adhesive layer 8a is pressure-bonded to the outer surface side via the thermosetting adhesive layer 8a, and at the same time, the thermosetting adhesive layer 8a is cured by the heat of the metal plate 1 to be temporarily bonded.

As a result, the concavo-convex forming step is performed at the same time as the film pressure bonding step of FIG. 3, and the polyester film 4 is pressure bonded at the same time as the polyester film 4 is pressure bonded, as in the case of the manufacturing method shown in FIG. The shape of 10 is transferred to the outer surface side of the polyester film 4, and a star-shaped concave portion 7 corresponding to the convex portion 10 is formed on the outer surface of the protective coating layer 5.

Incidentally, in the film pressure bonding step, as shown in FIG.
Similarly to the case of the manufacturing method shown, at the same time, the polyester film 4 is pressure-bonded to the side of the metal plate 1 which is the inner surface of the can,
Temporarily bonded.

Next, in the bonding step of FIG. 3, as in the case of the manufacturing method shown in FIG. 4, the metal plate 1 is heated to cure the thermosetting adhesive layers 8a, 8b, and the outer surface of the can. The polyester film 4 on which the concave portion 7 is formed and the polyester film 4 on the inner surface side of the can are permanently adhered to the metal plate 1, and the metal plate 1 having the configuration shown in FIG.
To form.

Then, in the can body forming step and the can body forming step of FIG. 3, canning is performed in the same manner as in the case of the manufacturing method shown in FIG.

Next, another modification of the manufacturing method shown in FIG. 4 will be described.

In the present manufacturing method, in the film pressure bonding step of FIG. 3, the cured overcoat layer 9, the printing layer 6 and the thermosetting adhesive layer 8a are formed as shown in FIGS. 4 (a) to 4 (c). As shown in FIG. 6, the polyester film 4 on which the ridges are formed is preliminarily prepared by a pressure roll 11a made of silicone rubber having a hardness of 70 and having a protrusion 10a having a shape along the contour of the printed layer 6 formed on the pressure face. The metal plate 1 preheated to a temperature of 150 to 180 ° C. is pressure-bonded to the side of the outer surface of the metal plate 1 via the thermosetting adhesive layer 8a, and at the same time, the thermosetting adhesive layer 8a is heated by the heat of the metal plate 1. Cure and temporarily bond.

As a result, the concavo-convex forming step is performed at the same time as the film crimping step in FIG. 3, and the polyester film 4 is crimped at the same time as in the manufacturing method shown in FIG. The shape of 10a is transferred to the outer surface side of the polyester film 4, and the outer surface of the protective coating layer 5 is provided with a recess 7a having a shape corresponding to the contour of the printing layer 6 corresponding to the projection 10a.

Incidentally, in the film pressure bonding step, as shown in FIG.
Similarly to the case of the manufacturing method shown, at the same time, the polyester film 4 is pressure-bonded to the side of the metal plate 1 which is the inner surface of the can,
Temporarily bonded.

Next, in the bonding step of FIG. 3, as in the case of the manufacturing method shown in FIG. 4, the metal plate 1 is heated to cure the thermosetting adhesive layers 8a, 8b, and the outer surface of the can. The polyester film 4 on which the concave portion 7a is formed and the polyester film 4 on the inner surface of the can are permanently adhered to the metal plate 1, and along the contour of the printing layer 6 as shown in FIG. 2 (b). 2 (a) except that the recess 7a is formed.
A metal plate 1 having a configuration similar to that shown is formed.

Then, in the can body forming step and the can body forming step of FIG. 3, canning is performed in the same manner as in the manufacturing method shown in FIG. In this manufacturing method, as shown in FIG. 5A, the thermosetting adhesive layer 8a may be formed on the outer surface of the can body of the metal plate 1.

Next, another method for manufacturing the metal can body shown in FIG. 1 will be described.

In this manufacturing method, in the film pressure bonding step of FIG. 3, as shown in FIGS. 4 (a) to 4 (c), the cured overcoat layer 9, the printed layer 6 and the thermosetting adhesive layer 8a are formed. As shown in FIG. 7, the polyester film 4 on which the above is formed is heat-cured on the side of the metal plate 1 which is preheated to a temperature of 150 to 180 ° C. to be the outer surface of the can by a pressure-bonding roll 11b having a smooth surface. At the same time when the thermosetting adhesive layer 8a is pressure-bonded via the mold adhesive layer 8a, the thermosetting adhesive layer 8a is hardened by the heat of the metal plate 1 and temporarily bonded.

In addition, in the film pressure bonding step, as shown in FIG.
Similarly to the case of the manufacturing method shown, at the same time, the polyester film 4 is pressure-bonded to the side of the metal plate 1 which is the inner surface of the can,
Temporarily bonded.

In this manufacturing method, at the stage where the polyester film 4 is temporarily bonded, the thermosetting adhesive layer 8a is formed.
Is not completely cured, the thermosetting adhesive layer 8a
3 is performed before the curing proceeds and the adhesion is completed. As shown in FIG. 7, the unevenness forming step of FIG. 3 has a hardness 7 provided downstream of and immediately after the pressure bonding roll 11b.
The polyester film 4 is pressure-bonded between an embossing roll 13 having a star-shaped convex portion 10 corresponding to the shape of the concave portion 7 formed on the film contact surface made of silicone rubber of No. 0 and a roll 14 having a smooth surface. Sandwich the metal plate 1
The metal plate 1 is pressed by the embossing roll 13 and the roll 14. The embossing roll 13 is heated to about 150 ° C.

As a result, the polyester film 4
Is deformed into a concave shape by being pressed by the convex portion 10, and the thermosetting adhesive layer 8a which is not completely cured as described above is also pressed due to the deformation, and the surfaces of the polyester film 4 and the metal plate 1 are also pressed. The layer thickness of the thermosetting adhesive layer 8a between and becomes thin, and the thermosetting proceeds in this state. As a result, the shape of the convex portion 10 of the embossing roll 13 is transferred to the outer surface side of the polyester film 4, and the outer surface of the protective coating layer 5 formed from the thermosetting adhesive layer 8a, the polyester film 4 and the cured overcoat layer 9 is formed. A star-shaped concave portion 7 corresponding to the convex portion 10 is formed in the.

Next, in the bonding step of FIG. 3, as in the case of the manufacturing method shown in FIG. 4, the metal plate 1 is heated to cure the thermosetting adhesive layers 8a, 8b, and the outer surface of the can. The polyester film 4 on which the concave portion 7 is formed and the polyester film 4 on the inner surface side of the can are permanently adhered to the metal plate 1, and the metal plate 1 having the configuration shown in FIG.
To form.

Then, in the can body forming step and the can body forming step of FIG. 3, canning is performed in the same manner as in the case of the manufacturing method shown in FIG.

Next, a modification of the manufacturing method shown in FIG. 7 will be described.

In the present manufacturing method, the polyester film 4 on which the cured overcoat layer 9 and the printing layer 6 are formed as shown in FIGS. 5B and 5C in the film pressure bonding step of FIG. As shown in FIG. 8, the thermosetting adhesive layer 8a is provided on the side which becomes the outer surface of the can by the pressure-bonding roll 11b having a smooth surface, and the metal plate 1 preheated to a temperature of 150 to 180 ° C. The thermosetting adhesive layer 8a is pressed by the thermosetting adhesive layer 8a at the same time, and the thermosetting adhesive layer 8a is attached to the metal plate 1 at the same time.
It is cured by the heat of and temporarily bonded.

Incidentally, in the film pressure bonding step, as shown in FIG.
Similarly to the case of the manufacturing method shown, at the same time, the polyester film 4 is pressure-bonded to the side of the metal plate 1 which is the inner surface of the can,
Temporarily bonded.

In the present manufacturing method, as in the case of the manufacturing method shown in FIG. 7, the thermosetting adhesive layer 8a is not completely cured when the polyester film 4 is temporarily adhered. Before the curing of the thermosetting adhesive layer 8a progresses and the bonding is completed, the concavo-convex forming step of FIG. 3 is performed, and as shown in FIG. 8, the embossing rolls provided downstream and immediately after the pressure bonding roll 11b. 13 and roll 1 with smooth surface
By pressing the metal plate 1 with 4, the shape of the convex portion 10 of the embossing roll 13 is transferred to the outer surface side of the polyester film 4, and a star-shaped concave portion corresponding to the convex portion 10 is formed on the outer surface of the protective coating layer 5. 7 is formed.

Next, in the bonding step of FIG. 3, as in the case of the manufacturing method shown in FIG. 4, the metal plate 1 is heated to cure the thermosetting adhesive layers 8a and 8b, and the outer surface of the can. The polyester film 4 on which the concave portion 7 is formed and the polyester film 4 on the inner surface side of the can are permanently adhered to the metal plate 1, and the metal plate 1 having the configuration shown in FIG.
To form.

Then, in the can body forming step and the can body forming step of FIG. 3, canning is performed in the same manner as in the manufacturing method shown in FIG.

Next, another modification of the manufacturing method shown in FIG. 7 will be described.

In this manufacturing method, in the film pressure bonding step of FIG. 3, the cured overcoat layer 9, the printed layer 6 and the thermosetting adhesive layer 8a are formed as shown in FIGS. 4 (a) to 4 (c). As shown in FIG. 9, the polyester film 4 on which the above is formed is heat-cured on the side of the outer surface of the metal plate 1 which is preheated to a temperature of 150 to 180 ° C. by a pressure-bonding roll 11b having a smooth surface. At the same time when the thermosetting adhesive layer 8a is pressure-bonded via the mold adhesive layer 8a, the thermosetting adhesive layer 8a is hardened by the heat of the metal plate 1 and temporarily bonded.

In the film pressure-bonding step, as shown in FIG.
Similarly to the case of the manufacturing method shown, at the same time, the polyester film 4 is pressure-bonded to the side of the metal plate 1 which is the inner surface of the can,
Temporarily bonded.

In the present manufacturing method, as in the case of the manufacturing method shown in FIG. 7, the thermosetting adhesive layer 8a is not completely cured when the polyester film 4 is temporarily adhered. Before the curing of the thermosetting adhesive layer 8a progresses and the adhesion is completed, the concavo-convex forming step of FIG. 3 is performed, and as shown in FIG. 9, the hardness of 70 is provided downstream of and immediately after the pressure bonding roll 11b. An embossing roll 13a made of silicone rubber in which a convex portion 10a having a shape along the contour of the printing layer 6 is formed on a film contact surface and a roll 1 having a smooth surface
By pressing the metal plate 1 with 4, the shape of the convex portion 10a of the embossing roll 13a is transferred to the outer surface side of the polyester film 4, and the convex portion 1 is formed on the outer surface of the protective coating layer 5.
0a, the concave portion 7a having a shape along the contour of the printed layer 6
Is formed.

Then, in the bonding step of FIG. 3, the metal plate 1 is heated to cure the thermosetting adhesive layers 8a and 8b in the same manner as in the manufacturing method shown in FIG. The polyester film 4 on which the concave portion 7 is formed and the polyester film 4 on the inner surface side of the can are permanently adhered to the metal plate 1, and the metal plate 1 having the configuration shown in FIG.
To form.

Then, in the can body forming step and the can body forming step of FIG. 3, canning is performed in the same manner as in the manufacturing method shown in FIG.

In this manufacturing method, as shown in FIG. 5 (a), the thermosetting adhesive layer 8a is formed on the outer surface of the can body of the metal plate 1.
May be formed.

In the first embodiment described above, the welding can body is described. However, in the case of an adhesive can body, it can be manufactured in the same manner as each of the above manufacturing methods. In the case of a bonded can body, in the can body part forming step of FIG. 3, the can body part may be formed by adhesion instead of welding.

Next, a second embodiment of the present invention will be described. The metal can body of the present embodiment is a bottomed cylindrical can body used for manufacturing a two-piece can body, and FIG.
As shown in FIG.
By adhering the same polyester film 4 as described above, a bottomed cylindrical can body 15 in which the polyester films 4 and 4 are adhered to the inner and outer surfaces of the can is formed as shown in FIG. The sectional structure of the can body of the bottomed tubular can body 15 shown in FIG. 10 (b) is similar to that shown in FIG. 2 (a) or FIG. 2 (b). A star-shaped recess 7 is formed on the outer surface side of the protective coating layer 5 formed by adhesion.
Alternatively, a concave portion 7a is formed along the contour of the printed layer 6.

Next, a method of manufacturing the metal can body shown in FIG. 10B will be described.

First, in the bottomed cylindrical can body forming step of FIG.
By squeezing the metal plate 1 having the polyester film 4 adhered to one surface thereof so that the polyester film 4 is on the inner surface of the can (DI),
(A) A bottomed tubular can body 15 having an opening is formed on one side.

Next, in the curing overcoat layer forming step, the printing layer forming step and the adhesive layer forming step of FIG. 11, the same steps as those of the metal can body manufacturing method shown in FIG. As shown in FIGS. 4 (a) to 4 (c),
The printing layer 6 and the thermosetting adhesive layer 8a are formed on one surface of the polyester film 4, and the transparent cured overcoat layer 9 is formed on the other surface.

Next, in the film crimping step of FIG. 11, the polyester film 4 on which the cured overcoat layer 9, the printing layer 6 and the thermosetting adhesive layer 8a are formed is made of a silicone rubber having a hardness of 70 and a pressure-bonding surface. It is sucked and held by a spindle (not shown) by a pressure roll (not shown) having a star-shaped protrusion corresponding to the shape of the recess 7, and preheated to a temperature of 150 to 180 ° C in advance. The bottomed cylindrical can body 15 (metal plate 1) is pressure-bonded to the outer surface of the can via the thermosetting adhesive layer 8a, and at the same time, the thermosetting adhesive layer 8a is placed in the bottomed cylindrical shape. The can body 15 is cured by heat and temporarily bonded. Alternatively, the polyester film 4 on which the cured overcoat layer 9, the printing layer 6 and the thermosetting adhesive layer 8a are formed is made of a silicone rubber having a hardness of 70 and has a shape along the contour of the printing layer 6 on the pressure-bonding surface. By a pressure-bonding roll (not shown) on which a convex portion is formed, it is suction-held on a spindle (not shown), and 150 to 180 in advance.
The tubular can body 15 (metal plate 1) with a bottom preheated to a temperature of ° C is pressure-bonded to the outer surface of the can via a thermosetting adhesive layer 8a, and at the same time, the thermosetting adhesive is applied. The layer 8a is cured by the heat of the bottomed cylindrical can body 15 and temporarily bonded.

By performing the pressure bonding as described above, the unevenness forming process is performed at the same time as the film pressure bonding process of FIG. 11 in the same manner as in the first embodiment, before the thermosetting adhesive layer 8a is completely bonded. The shape of the convex portion of the pressure roll is transferred to the polyester film 4, and a concave portion 7 (or 7a) corresponding to the convex portion of the pressure roll is formed on the outer surface of the protective coating layer 5.

Next, in the bonding step of FIG. 11, the thermosetting adhesive layers 8a and 8b are cured by heating the bottomed cylindrical can body 15 in the same manner as in the first embodiment. Then, the polyester film 4 in which the concave portion 7 (or 7a) on the side to be the outer surface of the can is formed is permanently adhered to the bottomed cylindrical can body 15.
As a result, as shown in FIG. 10B, a bottomed cylindrical can body 15 in which the inner surface of the can and the outer surface of the body of the can are covered with the polyester films 4 and 4 is formed.

Next, in the can body forming step of FIG. 11, the opening end of the can body is subjected to neck-in processing and flange processing (not shown) to form a metal can body, and the contents are filled according to a conventional method. A separately manufactured can lid is wound around the open end of the can body 15 to form a can.

Next, another method for manufacturing the metal can body shown in FIG. 10B will be described.

In the present manufacturing method, the polyester film 4 on which the cured overcoat layer 9, the printing layer 6 and the thermosetting adhesive layer 8a are formed in the film pressure bonding step of FIG.
Is suction-held on a spindle (not shown) by a pressure-bonding roll (not shown) having a smooth surface, and the pressure is 150 to 18 in advance.
The thermosetting adhesive layer 8a is pressed onto the side of the bottomed cylindrical can body 15 preheated to a temperature of 0 ° C., which is the outer surface of the can, and at the same time, the thermosetting adhesive layer 8a is pressed. The metal plate 1
It is cured by the heat of and temporarily bonded.

In this manufacturing method, at the stage where the polyester film 4 is temporarily adhered, the thermosetting adhesive layer 8a is formed.
Is not completely cured, the thermosetting adhesive layer 8a
11 is performed before the curing proceeds and the adhesion is completed. The embossing roll shown in FIG. 11 is an embossing roll in which a star-shaped convex portion 10 corresponding to the shape of the concave portion 7 is formed on the film contact surface and is made of silicone rubber having a hardness of 70 immediately after the pressure-bonding step by the pressure-bonding roll. (Not shown) presses the polyester film 4 press-bonded to the bottomed cylindrical can body 15 suction-held by the spindle. Alternatively, the bottomed bottom sucked and held by the spindle by an embossing roll (not shown) that is made of silicone rubber having a hardness of 70 and has a convex portion having a shape along the contour of the printing layer 6 formed on the film contact surface. The polyester film 4 pressed onto the tubular can body 15 is pressed.

As a result, the shape of the convex portion of the embossing roll is transferred to the polyester film 4, and the concave portion 7 (or 7a) corresponding to the convex portion of the pressure bonding roll is formed on the outer surface of the protective coating layer 5.

Next, in the bonding step of FIG. 11, the thermosetting adhesive layers 8a and 8b are hardened by heating the bottomed cylindrical can body 15 in the same manner as in the above-described manufacturing method, so that the outer surface of the can is bonded. The polyester film 4 on which the concave portion 7 (or 7a) on the side where
As shown in 0 (b), a bottomed cylindrical can body 15 in which the inner surface of the can and the outer surface of the body of the can are covered with polyester films 4 and 4.
Is formed.

Next, in the can body forming step of FIG. 11, it is canned in the same manner as in the above manufacturing method.

In each of the manufacturing methods of the present embodiment, as shown in FIG.
As shown in (a), the thermosetting adhesive layer 8a may be formed on the outer surface of the can body of the bottomed cylindrical can body 15 (metal plate 1).

Further, in this manufacturing method, as the metal plate 1, an aluminum alloy plate for various cans can be used.
As described above, the aluminum alloy plate for a can may have the polyester film 4 adhered to the inner surface of the can in advance, but when the polyester film 4 is not adhered to the inner surface of the can, the film pressure bonding step of FIG. After the polyester film 4 is pressure-bonded to the outer surface of the can, or before the pressure-bonding, a conventionally known inner surface coating material may be applied to the inner surface of the can of the bottomed cylindrical can body 15 to form a coating layer.

[0112]

As is apparent from the above, according to the metal can of the present invention, since the outer surface of the protective coating layer has the uneven shape formed by press molding, the protective coating layer can be A three-dimensional effect and depth are imparted to the outer surface, and a special cosmetic property having an excellent visual impression can be obtained.

In this case, a transparent synthetic resin film is used, a printing layer is provided between the synthetic resin film and the thermosetting adhesive layer, and the protective coating layer is formed by press molding on the outer surface side. When the recessed portions are provided along the contour of the printed layer, it is possible to provide the outer surface of the protective coating layer with a new composite aesthetic appearance by the printed layer and the uneven shape and to form a printed pattern. Can be expressed clearly.

By forming the uneven shape so that the step difference is 0.3 μm or more, the three-dimensional effect and the depth can be satisfactorily exhibited on the outer surface of the protective coating layer.

By using a polyester film, especially a polyethylene terephthalate film, as the synthetic resin film, a protective coating layer having excellent scratch resistance, heat resistance and the like can be obtained.

The synthetic resin film has a thickness of 5 to 25 μm,
By preferably having a thickness in the range of 5 to 20 μm, it is possible to advantageously form the uneven shape by press molding on the outer surface side of the protective coating layer.

Since the thermosetting adhesive layer has a thickness of 1 μm or more, it is possible to impart a good level difference to the uneven shape formed on the outer surface of the protective coating layer.

Further, the protective coating layer is provided with a transparent cured overcoat layer on the outer surface side of the synthetic resin film, whereby dimensional stability and scratch resistance can be improved. The cured overcoat layer has a thickness of 0.5 to 2.0 μm.
When the thickness is formed in the range, it is possible to advantageously form the uneven shape by press molding on the outer surface side of the protective coating layer.

According to the method for producing a metal can body of the present invention, a synthetic resin film is pressure-bonded to a metal surface of a pre-heated material for forming a can body by a pressure roll through a thermosetting adhesive layer, and the heat is applied. Before the curable adhesive layer is completely bonded, a concavo-convex shape is formed on the outer surface side of the synthetic resin film, and then the thermosetting adhesive layer is heat-cured to form the concavo-convex resin. By adhering the film to the material for forming a can body, it is possible to form the protective coating layer having the irregular shape.

In the manufacturing method of the present invention, since the pressure-bonding roll has an uneven shape on its pressure-bonding surface, the synthetic resin film is pressure-bonded via the thermosetting adhesive layer and at the same time the outer surface of the synthetic resin film is pressed. A shape corresponding to the uneven shape can be formed on the side.

Further, by providing an embossing roll having a concavo-convex shape on the surface contacting the synthetic resin film crimped to the metal surface downstream of the crimping roll, immediately after the crimping step by the crimping roll, The embossing roll can form a shape corresponding to the uneven shape on the outer surface side of the synthetic resin film. Further, by providing the embossing roll, only the embossing roll needs to be replaced when changing the concavo-convex shape, so that the concavo-convex shape can be easily changed.

In the above-mentioned manufacturing method, the uneven shape can be preferably transferred to the outer surface side of the synthetic resin film by using the pressure-bonding roll or the embossing roll forming the uneven shape, which is made of silicone rubber. .

When the synthetic resin film is transparent and the printing layer is interposed between the synthetic resin film and the thermosetting adhesive layer, the pressure roll or the embossing roll may be used. By forming a convex portion having a shape along the contour of the printed layer, it is possible to form a concave portion along the contour of the printed layer in the concavo-convex forming step, and emphasize the design or the like displayed on the printed layer. Can be expressed.

In the above manufacturing method, the material for forming a can is
Even in the case of a metal plate for forming a can body by overlapping or welding both end edges to form a can body, a tubular can with a bottom formed from the metal plate for forming a can body and having an opening on one side It can also be applied to at least the outer surface of the body of the body, and a metal can body can be obtained by winding a separately manufactured can lid around each open end.

[Brief description of drawings]

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

FIG. 2 is an explanatory sectional view showing the structure of a material for forming a can body of a metal can body according to the present invention.

FIG. 3 is a flowchart showing a method for manufacturing the metal can body shown in FIG.

4 is an explanatory cross-sectional view showing an example of the manufacturing method shown in FIG.

5 is an explanatory sectional view showing a modified example of the manufacturing method shown in FIG.

6 is an explanatory cross-sectional view showing another modified example of the manufacturing method shown in FIG.

7 is an explanatory cross-sectional view showing another example of the manufacturing method shown in FIG.

8 is an explanatory sectional view showing a modified example of the manufacturing method shown in FIG.

9 is an explanatory cross-sectional view showing another modified example of the manufacturing method shown in FIG.

FIG. 10 is an explanatory cross-sectional view showing another embodiment of the metal can body according to the present invention.

11 is a flowchart showing a method for manufacturing the metal can body shown in FIG.

[Explanation of symbols]

1 ... Metal plate, 3 ... Can body part, 4 ... Synthetic resin film, 5 ...
Protective coating layer, 6 ... Printing layer, 7, 7a ... Recesses formed by protrusions of pressure bonding roll, 8a, 8b ... Thermosetting adhesive layer, 9 ... Curing overcoat layer, 10, 10a ... Formed on pressure bonding roll Projected parts, 11, 11a ... Crimping roll, 1
3 ... Embossing roll, 15 ... Can body forming material.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29C 65/02 7639-4F B32B 27/36 8413-4F // B29K 67:00 105: 32

Claims (18)

[Claims] 1. A metal can body comprising a protective coating layer formed by adhering a synthetic resin film to a metal surface at least on the outer surface of the can body through a thermosetting adhesive layer, the outer surface of the protective coating layer. A metal can body characterized in that the side is provided with an uneven shape formed by press molding the thermosetting adhesive layer and the synthetic resin film. 2. A transparent synthetic resin film is used, a printing layer is provided between the synthetic resin film and the thermosetting adhesive layer, and pressure molding is performed on the outer surface side of the protective coating layer. The metal can body according to claim 1, further comprising a concave portion formed by the contour of the printed layer. 3. The metal can body according to claim 1, wherein the unevenness has a step difference of 0.3 μm or more. 4. The metal can body according to claim 1, wherein the synthetic resin film is a polyester film. 5. The metal can body according to claim 4, wherein the polyester film is a polyethylene terephthalate film. 6. The synthetic resin film has a thickness of 5 to 20 μm.
It is the range of m, The metal can body in any one of Claims 1-5 characterized by the above-mentioned. 7. The metal can body according to claim 1, wherein the thermosetting adhesive layer has a thickness of 1 μm or more. 8. The metal can body according to claim 1, wherein the protective coating layer comprises a transparent cured overcoat layer provided on the outer surface side of the can of the synthetic resin film. 9. The cured overcoat layer comprises 0.5-2.
9. Having a thickness in the range of 0 μm.
The described metal can body. 10. A film crimping step of crimping a synthetic resin film for forming a protective coating layer on a metal surface of a preheated can body forming material through a thermosetting adhesive layer by a crimping roll, and the thermosetting. A concavo-convex forming step of forming a concavo-convex shape on the outer surface side of the synthetic resin film before the mold adhesive layer is completely bonded; and a synthetic resin film having the concavo-convex shape formed by heat-curing the thermosetting adhesive layer. And a step of adhering the same to the material for forming a can body, the method for producing a metal can body. 11. The pressure-bonding roll has an uneven shape on its pressure-bonding surface, and the synthetic resin film is pressure-bonded via a thermosetting adhesive layer, and at the same time a shape corresponding to the uneven shape is formed on the outer surface side of the synthetic resin film. The method for producing a metal can body according to claim 10, wherein the metal can body is formed. 12. An embossing roll having a concavo-convex shape formed on the surface contacting the synthetic resin film pressure-bonded to the metal surface is provided downstream of the pressure-bonding roll, and immediately after the pressure-bonding step by the pressure-bonding roll, the embossing roll is provided. The method for producing a metal can body according to claim 10, wherein a shape corresponding to the uneven shape is formed on the outer surface side of the synthetic resin film by a roll. 13. The method for manufacturing a metal can body according to claim 11, wherein the pressure-bonding roll or the embossing roll is formed of a silicone rubber elastic body. 14. A transparent synthetic resin film is used, a print layer is interposed between the synthetic resin film and the thermosetting adhesive layer, and the press roll or the embossing roll is provided with the print layer. A convex portion having a shape along the contour is formed, and a concave portion is formed along the contour of the printing layer on the outer surface side of the protective coating layer by the convex portion during the concave-convex forming step. Claims 11 to 1 characterized
4. The method for producing a metal can body according to any one of 3 above. 15. The thermosetting adhesive layer is provided on the synthetic resin film.
15. The method for manufacturing a metal can body according to any one of 14 to 14. 16. The method for producing a metal can body according to claim 10, wherein the thermosetting adhesive layer is provided on a metal surface of the can body forming material. . 17. The can body-forming metal plate for forming a can body by laminating and welding or adhering both end edges of the can body forming material to each other.
7. The method for producing a metal can body according to any one of 6 above. 18. The bottomed cylindrical can body, wherein the can body forming material is formed of a can body forming metal plate and has an opening in one side thereof. The method for producing a metal can body according to.