JPH07299955A - Hot stamp printing method to metal product - Google Patents

Abstract

PURPOSE:To enhance the bonding strength of UV ink and the metal foil such as hot stamping foil or hologram foil bonded to the UV ink. CONSTITUTION:In a hot stamp printing method to a metal product, ultraviolet curable ink 4 containing a thermal adhesive 4a is printed on the substrate printing 2 and top coating 3 of the metal product only at the part of a character or figure to which brightness is desired to apply and hologram foil 8 is bonded to the ultraviolet curable ink 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for printing metal products such as aerosol cans, and more specifically, a UV curable ink (hereinafter "UV ink") printed on the surface of metal products.
), And a printing method aiming to improve the adhesive force with the hot stamping foil or hologram foil adhered on the UV ink.

[0002]

2. Description of the Related Art Conventionally, as a means for giving a metallic or iridescent feel to the surface of a metal container such as an aerosol can, UV ink is printed on a desired portion on the surface of the metal container and then hot stamping is applied onto the UV ink. The foil or hologram foil was glued.

However, when a hot stamping foil or a hologram foil is adhered onto the UV ink, conventionally, a thermoplastic adhesive is applied to the back side of these metal foils, and the thermoplastic adhesive and the UV ink are adhered to each other. I was doing
Since the adhesive strength is weak, there is a drawback that the metal foil is later peeled off. Therefore, conventionally, the metal foil is adhered and then a transparent top coating is applied to prevent the metal foil from peeling. However, applying the top coating from the top of the metal foil has the drawbacks of increasing the number of steps and increasing the manufacturing cost of the metal container.

The present invention has been made in view of the above-mentioned conventional problems. A UV ink arbitrarily printed on a metal container such as an aerosol can, and a hot stamping foil adhered on the UV ink. Alternatively, it is an object of the present invention to provide a hot stamp printing method for a metal product having excellent quality by improving the adhesive force with a metal foil such as a hologram foil.

[0005]

In order to solve this problem, the present invention performs a base printing of arbitrary characters, patterns, etc. on the surface of a metal product by a usual printing means, and then provides a top coating thereon. After the resin that has been heated is completely cured, UV ink containing a heat-sensitive adhesive is printed only on the desired portion of the base printing where glitter is desired, and a hot stamping foil is bonded onto the UV ink. A hot stamp printing method on a metal product, characterized in that the hot stamping foil is a hologram foil as an example.

[0006]

The operation of the present invention having the above construction will be described. In the hot stamp printing method for metal products according to the present invention, since the heat-sensitive adhesive is dispersed and mixed in the UV ink, when the hot stamping foil or the hologram foil is adhered, the roller is placed on the metal foil. When heated with, for example, the heat-sensitive adhesive in the UV ink is softened, and the heat-sensitive adhesive and the thermoplastic resin on the back surface of the metal foil are strongly bonded. Therefore, the adhesive force of the metal foil on the UV ink is improved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.
A hot stamp printing method on a metal product according to the present invention will be described. First, in the present invention, the base printing 2 of arbitrary characters, patterns and the like is applied to the surface of the metal container 1 such as an aerosol can by a normal step printing means. The base printing 2 may be performed by printing a desired character or pattern by a known printing means such as screen printing or offset printing. Then, a top coating 3 such as a thermosetting resin is applied on the base print 2. The thermosetting resin used for the top coating 3 in the present invention has excellent transparency and has appropriate surface hardness and strength such as epoxy resin, acrylic resin, polyurethane resin, polyester resin and amino resin. In addition, these 2
You may use it in mixture of 2 or more types. The method for applying the top coating 3 is not particularly limited, and examples thereof include a dipping method, a roll coating method, a brush coating method, and a spraying method.

Next, the UV ink 4 is printed on the top coating 3 by a method such as gravure printing, offset printing or screen printing. As UV ink 4,
Examples include polyester acrylate, epoxy acrylate, polyurethane acrylate, and the like. The feature of the present invention resides in that the UV ink 4 contains the heat-sensitive resin 4a. The heat-sensitive adhesive is obtained by any one of a polyfunctional monomer, a monofunctional monomer, and a thermoplastic resin, or a mixture of two or more thereof. Examples of polyfunctional monomers include diethylene glycol diacrylate, butanediol diacrylate, hexanediol diacrylate, dipentaerythritol hexaacrylate, pentaerythritol acrylate, trimethylolpropane triacrylate, neopentyl glycol diacrylate and the like. In addition, examples of monofunctional monomers include hydroxyl ethyl acrylate, hydroxyl propyl acrylate, and ethylhexyl acrylate. Further, as the thermoplastic resin, there are vinyl resin, acrylic resin, polyester resin, polyurethane resin, styrene resin and the like. This heat sensitive adhesive 4
The mixing ratio of a can be arbitrarily changed within the range of 1 to 40% (% by weight).

In the present invention, the UV ink 4 itself does not have a function as an adhesive for bonding the hot stamping foil 5, but has only a function of raising a desired character or pattern. The heat-sensitive adhesive 4a dispersed in the UV ink 4 has a function as an adhesive. The thickness of the UV ink 4 is 12 to 12 as with ordinary adhesives.
18 μm is preferable.

The UV ink 4 is printed on the top coating 3 by ordinary printing such as screen printing,
After completely curing, the hot stamping foil 5 is adhered. For the adhesion, the adhesive of the adhesive layer 5b formed on the back surface of the metal foil 5a of the hot stamping foil 5 and the heat-sensitive adhesive 4a dispersed and mixed in the UV ink 4 are firmly joined and adhered. For the adhesion, the hot stamping foil 5 is heated and pressed by a heating body such as a roller on a base film (not shown) of the hot stamping foil 5 to remove the adhesive layer 5b and the heat-sensitive adhesive 4a in the UV ink 4. To melt.

The adhesive of the adhesive layer 5b does not adhere to the top coating 3 even when heated and pressed onto the top coating 3, but adheres only to the raised UV ink 4.
The adhesive of the adhesive layer 5b is preferably a vinyl chloride-based vinyl acetate-based adhesive as a thermoplastic material. After the hot stamping foil 5 is adhered, the base film and the release layer of the hot stamping foil 5 are separated from the protective coloring layer and the vapor deposition layer. The hot stamping foil 5 adhered by the method of the present invention is reliably adhered on the UV ink 4 by the adhesive of the adhesive layer 5b and the heat-sensitive adhesive 4a contained in the UV ink 4, so that the durability is high. Yes, it does not peel off easily. The adhesive of the adhesive layer 5b may be a thermosetting adhesive such as epoxy resin or melamine resin.

Next, FIG. 2 shows another embodiment in which a hologram foil 8 is adhered onto the UV ink 4 instead of the hot stamping foil 5. Hologram foil 8
Is, for example, a base film (not shown), a release layer (not shown), a protective coloring layer 8a, a hollow layer 8b and a vapor deposition layer 8c.
And an adhesive layer 5b is similarly formed on the lower side thereof. A metal product such as an aerosol can printed by the method of the present invention has an extremely beautiful contrast because the rainbow color of the hologram foil and the metal color of the foil material are fused, and the contrast between the underprinting color is extremely vivid. It is a thing.

As shown in FIG. 3, by using offset printing on the surface of the aerosol can, underprinting is performed with only the letters "tp" in another color different from the white background, and after drying, a polyester resin top coating 3 is applied. It was Then, the polyester resin was placed in a heating furnace to completely cure the polyester resin.
Then, a polyester acrylate is printed as a UV ink 4 containing a polyester-based resin which is a heat-sensitive adhesive on the top coating 3 only on the portion of the letter "tp" of the underprint 2 and irradiated with UV. Let it harden,
After complete curing, hologram foil 8 was adhered on it. The bonding temperature was about 250 ° C. (bonding at 220 ° C. to 280 ° C. is preferable), and the stamp speed was 5 m / min.
A vinyl chloride-based vinyl acetate-based adhesive was used as the adhesive for the adhesive layer 5b attached to the lower surface of the hologram foil 8. The aerosol can thus printed was extremely beautiful, with only the part of the character "tp" being a bright, shiny gold color.

[0014]

As described above, according to the present invention, it is possible to improve the adhesion between the UV ink and the metal foil such as the hot stamping foil or the hologram foil.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing how a hot stamping foil is adhered to the surface of a metal product by a hot stamp printing method for a metal product according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a hologram foil manufactured by a hot stamp printing method on a metal product according to the present invention.

FIG. 3 is a perspective view of an aerosol can with a stamping foil manufactured by the manufacturing method according to the present invention.

[Explanation of symbols]

 1 Metal Products 2 Underprinting 3 Top Coating 4 Ultraviolet Curing Ink (UV Ink) 4a Heat Sensitive Adhesive 5 Hot Stamping Foil 8 Hologram Foil

Claims (3)

[Claims] 1. An underprinting of arbitrary characters, patterns, etc. is performed on a surface of a metal product by a usual printing means, and then a top coating is provided thereon, and the heated resin is completely cured, and then the underprinting is performed. Only to the desired portion of the desired to give the glitter, UV-curable ink containing a heat-sensitive adhesive is printed, and a hot stamping foil is adhered onto the UV-curable ink. Hot stamp printing method. 2. The heat-sensitive adhesive is any one of a polyfunctional monomer, a monofunctional monomer, and a thermoplastic resin.
The hot stamp printing method for a metal product according to claim 1, wherein the hot stamp printing is performed by using one kind or a mixture of two or more kinds. 3. The method of hot stamp printing on a metal product according to claim 1, wherein the hot stamping foil is a hologram foil.