JPH06320854A - Hot stamping printing method for article to be decorated and article to be decorated subjected to hot stamping printing - Google Patents

Abstract

PURPOSE:To apply hot stamping printing excellent in three-dimensional feeling and generating no crack or cloudiness in printing to an article to be decorated without requiring a complicated process. CONSTITUTION:Printing is applied only to a part where metal gloss is desired to be applied in substrate printing using ink 15 containing an ultraviolet curable resin and, after the printed part is irradiated with ultraviolet rays, a metallized foil is brought into contact with the surface of a can under heating and pressure to transfer the metallized layer 17 only to the printed part due to ink.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot stamping printing method for printing metallic luster on the surface of an object to be decorated, such as a metal can. Regarding decoration.

[0002]

2. Description of the Related Art In recent years, instead of chemical plating, hot stamping has been widely used for printing a metal luster on a molded object such as a plastic molded product, glass or metal product by transferring a metal vapor deposition foil. ing. A known metal-deposited foil used in a so-called pressing method (topographic method) which is a normal method of hot stamping generally includes a base film 1 made of a polyester film or the like, a release layer 2 and a coloring layer 3 as shown in FIG. The metal vapor deposition layer 4 and the adhesive layer 5 are sequentially formed, and a protective layer (not shown) may be provided between the release layer 2 and the coloring layer 3 if necessary. As the adhesive layer 5 of the publicly known metal vapor deposition foil 10, an adhesive made of a thermoplastic resin such as a thermoplastic acrylic-styrene-vinyl chloride vinyl acetate adhesive is used. When the metal vapor deposition foil 10 is placed along the transferred object and heated and pressed by a hot stamping machine, the adhesive layer 5 is softened and integrated with the transferred object.
Next, when the heating and pressurization are released, the metal vapor deposition foil is cooled together with the transferred material, and the adhesive layer 5 is cured to increase the adhesive force. Release layer 2
After the adhesive force between the transferred material and the adhesive layer 5 is stronger than the adhesive force between the base film 1 and the base film 1, the metal vapor deposition foil 10 is peeled off, and the base film 1 and the release layer 2 are separated. At this time, the colored layer 3 and the metal vapor deposition layer 4 between the release layer 2 and the adhesive layer 5 remain on the transfer target side, and printing having a desired metallic gloss can be obtained.

As a hot stamping technique different from the above-mentioned push type system, there is a technique described in Japanese Patent Publication No. 55-6514. In this method, an arbitrary letter, pattern, or the like is printed on the surface of a metal product by a usual printing means, and then a top coating of a thermosetting resin is provided thereon, and the resin is completely cured by heating. After that, only the desired portion of the base printing is printed with a thermosetting resin,
Immediately before the resin of the ink is completely cured by heating, the metal vapor deposition foil is pressed against the printed surface of the thermosetting resin, the metal foil of the metal vapor deposition foil is stamped, and then heated to completely cure ( For convenience of explanation below, this method is
Called the binder method).

[0004]

According to the hot stamping method by the above-mentioned pressing die method, it is possible to perform printing with a metallic luster on an object to be decorated such as a metal can in a simple process. The glossy part has a defect that it lacks a three-dimensional effect and a sufficient decorative effect cannot be obtained.

Further, according to the hot stamping method using the binder method, the ink made of the thermosetting resin printed on the top coating forms a raised portion, so that printing with a three-dimensional effect is performed as compared with the pressing method. However, an extra step of heating the thermosetting resin in the oven until just before it is completely cured and an additional step of heating it again in the oven to completely cure the thermosetting resin after transferring the metal foil are required. The hot stamping process is significantly more complicated than the pressing method, and the oven is 2
Since there is a need for a stand, there is a drawback in that the equipment is large-scale and the printing cost increases.

Further, according to the hot stamping method based on the binder method, since the metal vapor deposition foil is transferred immediately before the ink made of the thermosetting resin is completely cured, some solvent still remains in this ink. However, since this solvent volatilizes when the ink is completely cured by subsequent heating, there is a defect that cracks and cloudiness often occur in a printed portion having a finished metallic luster.

The present invention has been made in order to solve the problems of the conventional hot stamping printing method for a decorated object such as a metal can, and is capable of performing printing excellent in three-dimensional effect and complicated. Without the need for various processes and large-scale equipment,
Moreover, it is an object of the present invention to provide a hot stamping printing method for an object to be decorated, which does not cause cracks or cloudiness in the finished printed portion, and an object to be decorated by the hot stamping printing method.

[0008]

A hot stamping printing method for an object to be decorated according to the present invention, which achieves the above object, provides a surface of the object to be decorated with at least one of white coating and base printing, if necessary. , A finishing varnish layer is formed by applying and curing a finishing varnish of thermosetting resin or ultraviolet curable resin, and then printing with the ink of the ultraviolet curable resin only on the desired portion of the base printing where metallic gloss is desired to be imparted. And UV irradiation until the UV-curable ink is firmly adhered to the finishing varnish layer, and then heat-pressing a metal vapor deposition foil or a metal foil onto the surface of the object to be decorated. It is characterized in that the metal vapor deposition foil or the metal vapor deposition layer or metal foil layer of the metal foil is transferred only to the printed portion.

The object to be decorated according to the present invention which achieves the above object is formed on the surface of the object to be decorated with at least one layer of a white coat and an underlayer printing, which is optionally provided. Finishing varnish layer of thermosetting resin or UV-curing resin, printed portion with ink of UV-curable resin printed on desired portion on the finish varnish layer, and printing portion with ink of this UV-curable resin And a metal vapor deposition layer or a metal foil layer having a metallic luster formed on the above.

According to the printing method of the present invention, since the ink of the ultraviolet curable resin is used for printing only the desired portion of the base printing where the metallic luster is desired to be imparted, the portion printed by the ultraviolet curable ink is the finishing varnish layer. It is formed as a raised portion on the surface of, and by transferring the metal vapor deposition foil or the metal vapor deposition layer or the metal foil layer of the metal foil to this portion, it is possible to realize printing having a metallic luster excellent in three-dimensional effect.

Since the ink of the ultraviolet curable resin is cured by one irradiation of ultraviolet rays, the process is shortened as compared with the conventional method using the ink of the thermosetting resin which requires heating twice before and after the heating. It does not require two ovens, so the size of the equipment can be small.

Since a solvent-free UV curable resin ink is used as a binder for the metal vapor deposition layer or metal foil layer, cracks or cloudiness may occur in the printed portion of the metal vapor deposition layer or metal foil layer after transfer. Not at all.

The objects to be decorated according to the present invention include metal products such as metal cans, glass products such as glass containers, ceramic products, ceramics, hard plastic products, wooden furniture, leather products, and the like. There is no particular limitation.

Next, the case of applying the printing method of the present invention to a metal can will be described in detail with reference to FIG.

When a decorative object such as an aluminum impact can is printed by the printing method of the present invention, a white coat or a size coat 12 is usually provided on the surface of the can 11, and a thermosetting resin or ultraviolet curing is applied on the white coat or size coat 12. Using the color ink 13 made of a volatile resin, base printing of characters, patterns, etc. is performed by a known printing method such as screen printing or offset printing. After curing the underprinting ink 13 or while the underprinting ink 13 is in a wet state, a finishing varnish such as a transparent varnish of a thermosetting resin or an ultraviolet curable resin is applied and dried by heating or ultraviolet ray. The finishing varnish layer 14 is formed.

In the method of the present invention, the finishing varnish layer 1
It is important to select a resin having good adhesiveness with the ink of the ultraviolet curable resin as the resin forming 4, and as a result of experiments, particularly suitable resins for achieving this purpose are polyester resin, epoxy resin, It was found to be an acrylic resin, an aminoalkyd resin and a urea resin.

After the finish varnish layer 14 is formed, silk screen printing is performed using the ink 15 of the ultraviolet curable resin only on the desired portion of the base printing where it is desired to impart metallic luster. As the ultraviolet curable resin as the ink 15, for example, a mixture of a prepolymer obtained by esterifying an epoxy resin, a urethane resin, a polyester resin or the like with acrylic acid and an acrylic monomer is suitable.

If the can temperature is raised to 35 ° C. to 80 ° C. by heating the can before and / or after silk screen printing with the ink of the above ultraviolet curable resin, the ink is sufficiently wet on the surface of the finishing varnish. It was found that the adhesion between the ink 15 of the spreading ultraviolet curable resin and the finishing varnish layer 14 was improved. This tendency is especially caused by the finish varnish layer 14
Remarkably appears when using a polyester resin as
In this case, printing with ink of UV-curable resin with the can temperature below 35 ° C may cause the metal vapor deposition layer and the ink layer to peel from the finishing varnish layer in the cellotape peeling test described below, resulting in sufficient adhesion. I can not get sex. On the other hand, if the temperature of the can is 80 ° C. or higher, the printed ink 15 of the ultraviolet curable resin flows and print defects occur, which is not preferable. When an epoxy resin is used as the finishing varnish layer resin 14, a practically sufficient degree of adhesion can be obtained even at a can temperature of room temperature, but if the can temperature is within the above temperature range, better adhesion can be obtained. it can.

When the can is heated before and / or after the silk screen printing as described above, a heating device for that purpose is required. A relatively small heater is sufficient as this heating device, It is not necessary to use two ovens unlike the binder method using the thermosetting resin, so there is no inconvenience that the apparatus becomes large in scale.

In the present invention, the curing of the ink 15 of the ultraviolet curable resin by the irradiation of ultraviolet rays is performed by the ink 15 of the ultraviolet curable resin when the metal vapor deposition foil heated and pressed against the can surface is removed in the subsequent hot stamping step. Is firmly adhered to the finishing varnish layer 14 so as not to be peeled off from the finishing varnish layer 14 while being adhered to the metal vapor deposition foil side. That is, it is necessary to irradiate ultraviolet rays until the ink 15 of the ultraviolet curable resin is in a state of being almost completely cured. Therefore, a preferable ultraviolet irradiation amount is an irradiation amount when the can passes at a speed of 10 to 20 m / min with a 60 to 160 watt cm 2 lamp or an amount equivalent to this.

After the ink 15 is cured by irradiating it with ultraviolet rays under the above-mentioned conditions, hot stamping is carried out in which the metal vapor deposition foil or the metal foil is heated and pressed onto the surface of the can.

The metal vapor deposition foil can be manufactured by a known method. That is, a mold release layer made of PMMA or the like and a colored layer made of a resin containing a dye for imparting a desired metal color (for example, gold) are formed by coating on a base film made of a polyester film or the like by a gravure method. A metal vapor deposition layer of aluminum or the like is vapor-deposited and formed on the colored layer by a roll-up type metal vapor deposition device or the like. An adhesive layer made of a thermoplastic resin such as a thermoplastic acrylic-styrene-vinyl chloride vinyl acetate type adhesive is applied onto the metal vapor deposition layer by a gravure method or a reverse method to form an adhesive layer. It should be noted that the adhesive has a good adhesion to the ink 15 of the ultraviolet curable resin and has a finish varnish layer 14
Select a material that does not adhere to.

The hot stamping can be performed by a known roll hot stamping machine for cylinders or a reciprocating hot stamping machine for cylinders. Can temperature during hot stamping is room temperature to 120 ° C, stamping temperature is 170 ° C
The metal vapor deposition foil or the adhesive layer 16 in the metal foil is heat-fused to the ink 15 of the ultraviolet curable resin by hot stamping at 280 ° C., and when the heating and pressurization are released, the metal vapor deposition foil or the metal foil together with the can. Upon cooling, the adhesive layer 16 hardens and the adhesive strength increases. Then, when the metal vapor deposition foil or metal foil is peeled off, the metal vapor deposition layer or metal foil layer 17 remains on the can side,
A print with the desired metallic gloss is obtained.

If necessary in order to increase the adhesive strength, a proper amount of a thermosetting resin is mixed with an ink containing a UV curable resin as a main component, and the UV curable resin component is cured by irradiation with UV rays. It is also possible to carry out hot stamping after this and then heat the can to cure the thermosetting resin.

[0025]

【Example】

Example 1 A white-coated aluminum can was subjected to rectangular underprinting with a thermosetting ink, and a finish made of an epoxy resin was applied while the underprinting ink was in a wet state, followed by heating and drying. Next, on the surface of this can, using a printing ink whose main component is a UV-curable resin consisting of a mixture of a prepolymer in which an epoxy resin was esterified with acrylic acid and an acrylic monomer, was aligned with the pattern of the underprinted can. The circular pattern was silk screen printed. 80W / cm x 2 for the design of this silk screen printed can
After irradiating ultraviolet light under the condition of light, 10 m / min, using a roll type hot stamping machine for cylinders, commercially available metal vapor deposition foil is heated at a can temperature of 70 ° C. and a stamping temperature of 250 ° C., pressure-bonded, and silk. The metal vapor deposition layer was selectively transferred to the printed part.

The foil transfer portion of the aluminum can obtained by the above steps was subjected to a cross-cut with a knife and a non-cross-cut foil, and a peeling test was conducted by adhering cellophane tape. In the case of No. 1, the metal vapor deposition layer did not stick to the cellophane tape and peeled off from the can at all.

Further, when the can was immersed in warm water of 65 ° C. for 15 minutes and then subjected to finger pressure rubbing for 30 reciprocations, peeling of the metal vapor deposition layer was not observed at all.

The vapor-deposited layer transfer portion of the aluminum can thus obtained exhibits good wear resistance and adhesion, and
It had an excellent decorative effect with a sufficient three-dimensional effect.

Example 2 A rectangular undercoat was printed with a thermosetting ink on a white-coated aluminum can and dried by heating. A finish made of polyester resin was coated on this and dried by heating. Next, after heating this can to 35 ° C., in the same process as described in Example 1, silk screen printing with ink of UV curable resin, UV irradiation, and hot stamping of metal deposition foil were performed to transfer the metal deposition layer. Let

The same test as in Example 1 was carried out on the vapor-deposited layer transfer portion of the obtained aluminum can, and the vapor-deposited layer transfer portion also showed good wear resistance and adhesion.

Example 3 The same material as in Example 2 was used except that the heating of the can was performed not after silk screen printing but after the silk screen printing was completed and before the irradiation of ultraviolet rays and the can temperature was set to 60 ° C. Using the same process as in Example 2, the metal vapor deposition layer was transferred. The vapor-deposited layer transfer part of the obtained aluminum can showed good wear resistance and adhesiveness similar to those in Examples 1 and 2.

Example 4 Acrylic UV paint was applied to the outer circumference of a cylindrical glass container in an amount of 10%.
After coating with a thickness of ~ 15 microns, use infrared rays at 70 ° C for 3
~ Heat for 5 minutes, and then 120Watt / cmx on the coated surface
Irradiate ultraviolet light under the condition of 2 lights, 2 m / min. Next, on this coated surface with printing ink mainly composed of ultraviolet curable resin,
A belt-shaped pattern was silk-screen printed on the circumference. 80Watt / c for this silk screen printed striped pattern
After irradiating ultraviolet rays under the condition of m × 2 lamps and 10 m / min,
Using a roll hot stamping machine for cylinders, a commercially available metal vapor deposition foil is placed on the outer circumference of the glass container at 70 ° C. and a stamping temperature of 250.
The metal vapor deposition foil was selectively transferred to the silk-printed portion by heating and pressure bonding at ℃.

Tests were carried out to test the vapor-deposited layer transfer portion of the glass container obtained by the above steps, which was cross-cut with a knife and which was not cross-cut, by adhering a scotch tape and peeling it off. In any case, the metal vapor deposition layer did not adhere to the cellophane tape and peeled off from the glass container at all.

[0034]

As described above, according to the printing method of the present invention, since the ink of the ultraviolet curable resin is used for printing only the desired portion of the base printing where the metallic luster is desired to be imparted, the ultraviolet curable The printed part with ink is formed as a raised part on the surface of the finishing varnish layer, and by printing the metal evaporated foil or the metal evaporated layer of the metal foil or the metal foil layer on this part, printing with a metallic luster excellent in three-dimensional effect Can be realized.

Further, according to the method of the present invention, since the ink of the ultraviolet curable resin is cured by the irradiation of the ultraviolet ray once, the ink of the thermosetting resin which needs to be heated twice before and after the conventional method is used. Compared with the method, the process is shortened and two ovens for heating are not required, so that the scale of the apparatus is small and the printing cost can be reduced.

Furthermore, since solvent-free UV-curable resin ink is used as a binder for the metal vapor deposition layer or metal foil layer, cracks or cloudiness may occur in the printed portion of the metal vapor deposition layer or metal foil layer after transfer. There is no problem, and there is no risk of printing defects.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of an aluminum can after transferring a metal vapor deposition foil by the method of the present invention.

FIG. 2 is a sectional view showing a structure of a conventional metal vapor deposition foil.

[Explanation of symbols]

 11 cans 12 white coat or size coat 13 base printing ink 14 finishing varnish 15 UV curable resin ink 16 adhesive layer of metal deposition foil 17 metal deposition layer

Claims (6)

[Claims] 1. A finishing varnish layer is obtained by applying a finishing varnish of a thermosetting resin or an ultraviolet curable resin to the surface of an object to be decorated, if necessary, after performing at least one of white coating and underprinting, and curing the resulting varnish. After formation, printing is performed with the ink of the UV curable resin only on the desired portion where the metallic luster is desired to be imparted, and UV irradiation is performed until the UV curable ink is firmly adhered to the finish varnish layer, and then applied. By subjecting a metal vapor deposition foil or a metal foil to heat and pressure contact with the surface of the ornament, the metal vapor deposition foil or the metal vapor deposition layer or the metal foil layer of the metal foil is transferred only to the printed portion by the ultraviolet curable ink. Hot stapling printing method for decorations. 2. The hot stamping printing method according to claim 1, wherein the object to be decorated is a metal can. 3. The hot stamping printing method according to claim 1, wherein the object to be decorated is a glass object to be decorated. 4. A layer of at least one of a white coat and a base print, which is optionally provided on the surface of the object to be decorated, and a finish varnish layer of a thermosetting resin or an ultraviolet curable resin formed thereon, A printed portion with an ultraviolet curable ink printed on a desired portion on this finishing varnish layer,
An object to be decorated, comprising a metal vapor deposition layer or a metal foil layer having a metallic luster formed on a printed portion of the ink of the ultraviolet curable resin. 5. The decorated object according to claim 4, wherein the decorated object is a metal can. 6. The decorated article according to claim 4, wherein the decorated article is a glass decorated article.