JPH0792634B2 - Method of forming hologram with picture - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Prior Art) A hologram is capable of reproducing a three-dimensional image by utilizing a wavefront of light from an object as an interference pattern of light.

Since such holograms require high technology for manufacturing, they are provided as part of cards such as credit cards and bank cards, certificates, certificates, vouchers such as gift certificates, etc. as an anti-counterfeiting means, and opened. It is provided on the sealed documents as a means of prevention. Also, it is provided on magazines, books, record jackets, packages, clothing, etc. for the purpose of novelty of appearance for decoration.

The hologram is provided on various adherends as described above, but in many cases, the color limitation due to the manufacturing method, that is, the color of the entire hologram is determined by the light-reflecting metal layer, and usually the light reflecting Since aluminum is used as the conductive metal layer, it is limited to silver white,
It was not in harmony with the adherend, which caused restrictions on the design of the adherend. Therefore, in order to eliminate this drawback, various attempts have been made to provide a hologram provided on an adherend with a free pattern that is in harmony with the adherend design by a printing method. It was difficult and the quality of the obtained product was not constant, which was not suitable for mass production.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned conventional drawbacks. That is, the present invention provides a method for forming a hologram with a pattern, which is suitable for the design of an adherend and which can efficiently provide a pattern on the hologram in synchronization with the hologram.

(Means for Solving Problems) The method for forming a hologram with a pattern according to the present invention includes a pattern transfer sheet in which a pattern layer and an adhesive layer are sequentially laminated on a release sheet as a support, and an adherend. Holographic glass having a light-reflecting metal layer provided is overlapped so that the adhesive layer and the hologram surface face each other, and heating or pressure bonding is performed so that the light-reflecting metal layer forming the hologram is not cracked. Then, the pattern layer is transferred and provided on the hologram surface via an adhesive layer having transparency such that the hologram can be seen through.

The pattern transfer sheet according to the present invention has a pattern layer and an adhesive layer sequentially laminated on a release sheet. If necessary, a release layer or a protective layer or both of them may be provided between the release sheet and the pattern layer. It may be provided, or an anchor layer may be provided between the pattern layer and the adhesive layer.

The present invention will be described below with reference to specific examples shown in the drawings.

The pattern transfer sheet 1 according to the present invention is configured such that a pattern layer 3 and an adhesive layer 4 are sequentially laminated on a release sheet 2 as shown in the sectional view of FIG. A pattern transfer sheet 1 which is another specific example has a cross-sectional view between the release sheet 2 and the pattern layer 3 as shown in FIG.
The release layer 5 and the protective layer 6 are provided in this order, and further,
An anchor layer 7 is provided between the pattern layer 3 and the adhesive layer 4.

As the release sheet 2 as a support, a sheet-like material having a releasability such that the surface thereof is easily and releasably adhered to the pattern layer 3 or a release layer provided on the pattern layer 3 as necessary is widely used. To be For example, polyethylene terephthalate, polypropylene, polyethylene, polyamide,
Plastic films such as polystyrene, releasable films obtained by coating these films with a release agent, further kraft paper, glassine paper, parchment paper laminated with the above-mentioned films, and further silicon treatment of these films and paper. Any of the above can be used. The thickness of the release sheet 2 may be about 1 to 200 μm as long as it has appropriate strength.

For the pattern layer 3, various patterns can be selected according to the design of the adherend and the hologram to be transferred. For example, a normal print pattern, a solid pattern with a whole surface, a solid pattern with a white space (a window), a logo, a number, a symbol. , A tint block, a mark, a security code for preventing forgery, and a pattern are used. The above pattern allows the hologram to be concealed or seen through, depending on the selection of the pigment and dye of the ink used, or the ink coating thickness,
The degree of coloring can be changed. Of course, it may be transparent.

Such a pattern layer is generally formed on the release sheet or on the release layer or the protective layer, which is provided on the release sheet as necessary, by a silk screen printing method, an offset printing method, a letterpress printing method, an electrostatic printing method, or the like. Ink that can be used in each method by a conventional coating method such as a printing method or a gravure coating, a die coating method, a roll coating method, a knife coating method, or the like, is formed with an appropriate coating thickness in consideration of the hiding effect on the hologram. It

The adhesive layer 4 is for adhering the pattern layer 2 or the anchor layer 7 provided as necessary to the hologram surface, in many cases, a synthetic resin, and as the adhesive, a heat-sensitive adhesive or a pressure-sensitive adhesive is used. Used. These adhesives are capable of adhering at a temperature that does not cause cracks in the light-reflecting metal layer forming the hologram, which is aluminum in many cases, and have transparency such that the hologram can be seen through after adhering. I have to

Here, preferable heat-sensitive adhesives include, for example, rubber-based resins such as polyisoprene rubber, polyisobutyl rubber, styrene-butadiene rubber, and butadiene acrylonitrile rubber, (meth) acrylic acid ester-based resins, polyvinyl ether-based resins, polyvinyl acetate-based resins. Resin, vinyl chloride vinyl acetate copolymer resin, polystyrene resin, polyester resin, polyamide resin, epoxy resin, urethane resin, polychlorinated olefin resin, polyvinyl butyral resin, etc. , A softening agent, a filler, a heat-sensitive adhesive prepared by adding an additive such as an anti-aging agent can be used, and as the pressure-sensitive adhesive, for example, an acrylic resin, an acrylic acid ester resin, or a copolymer thereof, Styrene butanediene copolymer, natural rubber, casein, gelatin, rosin Ester, terpene resin, phenol resin, styrene resin, chroman indene resin,
A pressure-sensitive adhesive containing xylene, an aliphatic hydrocarbon, polyvinyl alcohol, polyethylene oxide, polymethylene oxide, polyethylene sulfonic acid, etc. as a main ingredient and the above-mentioned additives and the like added as necessary can be used.

If necessary, an organic solvent may be added to such an adhesive to adjust the viscosity, and then the pattern layer 3 or the pattern layer 3 or as necessary may be prepared by a conventional coating method such as roll coating, die coating, knife coating or gravure coating. Coating thickness 0.5-2 on the anchor layer 7 provided
It is formed with 0μ.

The release layer 5 provides a release property between the release sheet 2 and the pattern layer 3, and also plays a role of protecting the pattern layer after transfer.
As the release layer 5, widely used is a known release layer such as an acrylic resin, a cellulose resin, a vinyl resin, a polyester resin, a urethane resin, an olefin resin, an amide resin, or an epoxy resin. it can. The thickness of the peeling layer is 0.05 to 10 μm, preferably 0.2.
It is preferably ˜2 μm.

When the pattern layer serves as the release layer, the release layer is basically unnecessary.

The protective layer 6 enhances the adhesiveness between the pattern layer 3 and the peeling layer 5, and also plays the role of giving the durability of the pattern layer.
As the protective layer, widely used are those known as conventional protective layers such as curable acrylic resin, cellulose resin, vinyl resin, polyester resin, urethane resin, olefin resin, amide resin, and epoxy resin. it can. The thickness of this protective layer is 0.05 to 10 μm, preferably 0.
It is preferably 2 to 2 μm.

The anchor layer 7 plays a role of enhancing the adhesiveness between the pattern layer 3 and the adhesive layer 4. As the anchor layer 7, those conventionally known as anchor layers such as vinyl chloride-vinyl acetate copolymer, acrylic resin, urethane resin, epoxy resin, polyester resin can be widely used. The thickness of the anchor layer is preferably 0.02 to 10 μm, and more preferably 0.2 to 2 μm.

A pattern transfer sheet according to the present invention as described above,
The hologram provided on the adherend by transfer or bonding is brought into contact with the adhesive 6 and the hologram surface, and the transfer device transfers heat and pressure to transfer the pattern layer onto the hologram, A hologram with a pattern according to the invention is formed.

As the transfer conditions, in the case of heating and pressurizing, the temperature is 50 to 130 ° C., the pressure is 5 to 20 kg / cm ² , and the time is 1 to 1 so that the light reflective metal layer forming the hologram is not cracked.
Transfer is performed for 3 seconds, and in the case of pressurization, the pressure is 5 to ²⁰ kg / cm ² and the time is 1 to 5 seconds.

The transfer speed, that is, the feeding speed of the transfer target, the carry-out speed, the vertical speed of the stamper, the transfer roll speed, etc., differ depending on the shape of the transfer target, but at least the pattern transfer sheet is a continuous sheet, so efficient continuous transfer is possible. Is possible.

Further, in the present invention, a picture transfer label whose one structural example is shown in FIG. 3 can also be used.

The pattern transfer label 11 shown in the figure is on the base material sheet 12,
The pattern layer 3, the adhesive layer 13, and the release paper 14 are laminated in this order. The base sheet 12 serves to protect the pattern layer 3 and to increase the mechanical strength of the whole, and its material is polyvinyl chloride, polyester, acrylic resin,
Epoxy resins, amide resins, urethane resins, etc. are used, and the film thickness thereof is preferably 1 to 500 μm.

As the material of the pressure-sensitive adhesive layer 13, general pressure-sensitive adhesives such as acrylic type and rubber type are widely used. This pressure-sensitive adhesive is obtained by adding a tackifier to an elastic body, and as the elastic body, polyisoprene rubber, polyisobutyl rubber, SBR, a rubber system such as butadiene-asilolonitrile rubber, an acrylic ester system,
Examples thereof include polyvinyl ether type, and examples of the tackifier include polyterpene resin, gum rosin, rosin ester and rosin derivative, oil-soluble phenol resin, coumarone indene resin, petroleum hydrocarbon and the like. In addition to the tackifier, a softening agent, a filler, an antiaging agent, etc. may be added. The pressure-sensitive adhesive layer 13 preferably has a thickness of 0.1 to 50 μm.

As the release paper 14, used is a base material such as paper or film coated with a silicone resin, wax, paraffin or the like.

The pattern transfer label 11 configured as described above is cut and formed in an appropriate size, the release paper 14 is peeled off, and the pattern is transferred onto the hologram by sticking it on the hologram surface via the adhesive 13, and A hologram with a pattern according to the invention is formed.

(Function and Effect) Since the hologram forming method with a pattern of the present invention has the above characteristics, it has the following effects.

(1) The hologram with a pattern formed by the present invention is
By having a free pattern according to the design of the adherend, it becomes a hologram of extremely high decorative value.

(2) Further, by producing a peculiar visual effect in which the pattern and the hologram are synchronized, the hologram itself cannot be tampered with, and the adherend cannot be forged, resulting in extremely high forgery prevention.

(3) Usually, the hologram is provided on the adherend by transfer or bonding using a transfer device or the like. According to the method for forming a hologram with a pattern of the present invention, the transfer device or the like used for transferring or bonding the hologram to the adherend can be used as it is, and the steps, the use device can be simplified and the work efficiency can be greatly improved. It will be possible.

(4) Further, since the apparatus used for transferring or bonding the holograms can be used as it is, the method of the present invention enables the pattern to be formed on all the holograms.

(5) Furthermore, by separating the process of forming the hologram on the adherend and the process of forming the pattern layer, a transfer having a large film thickness and poor foil cutting property such as a transfer sheet having a hologram and a pattern layer is performed. The hologram and the pattern layer can be provided on the adherend without using a sheet, the loss of the expensive adherend is small, the product quality is constant, and it is suitable for mass production.

The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

Example 1 A polyethylene terephthalate film having a thickness of 25 μm as a release sheet was prepared by gravure reverse coating using a release layer-forming composition (1) having the following compounding ratio as a protective layer and a release layer. μ) formed.

Next, on the above-mentioned release layer, an ink composition (2) having the following mixing ratio was used to form a multicolored opaque pattern layer having high hiding power by silk screen printing.

Next, an anchor layer having a thickness of 1 μm was formed on the above-mentioned pattern layer by gravure reverse coating using the composition for anchor (3) having the following mixing ratio.

Next, the following heat-sensitive adhesive (4) was applied on the anchor layer to a thickness of about 5 μm when dried and dried to prepare a pattern transfer sheet.

Next, the surface of the heat-sensitive adhesive of the pattern transfer sheet obtained above and the surface of the hologram transferred to the surface of the credit card are overlapped, and both of them are heated at a temperature of 130 ° C. and a pressure of 10 kg / cm ² for 0.5 to After heating and pressing for 1 second, the release sheet of the transfer sheet was peeled off from the release layer surface, and the pattern was transferred onto the hologram to form a hologram with the pattern. Since it is difficult to prevent forgery of the hologram, this product has an anti-counterfeiting effect and is very beautiful in which the design of the card and the pattern on the hologram are in harmony, and the anti-counterfeiting effect is further enhanced.

Example 2 A polyethylene terephthalate film having a thickness of 25 μm as a release sheet was coated with a composition (1) for forming a release layer having the following blending ratio as a protective layer and a release layer, and a release layer (thickness 0.5 μ) formed.

Next, an ink composition (2) having the following blending ratio was used to form a multicolor translucently colored pattern layer on the above-mentioned release layer by silk screen printing.

Next, an anchor layer having a thickness of 1 μm was formed on the above-mentioned pattern layer by gravure reverse coating using the composition for anchor (3) having the following mixing ratio.

Next, the following adhesive layer composition (4) was applied on the anchor layer to a dry thickness of about 5 μm and dried to prepare a pattern transfer sheet.

Next, the surface of the adhesive of the pattern transfer sheet obtained above and the surface of the hologram transferred to the surface of the gift certificate are superposed, and both are pressed under the condition of a pressure of 10 kg / cm ² for 1 to 5 seconds. Then, the release sheet of the transfer sheet was peeled off from the release layer surface, and the pattern was transferred onto the hologram to form a hologram with the pattern. This product has an anti-counterfeiting effect because it is difficult to prevent forgery of the hologram, and it is a very beautiful product in which the design of the gift certificate and the pattern on the hologram are in harmony.
The anti-counterfeiting effect was enhanced.

[Brief description of drawings]

1 and 2 are sectional views of the pattern transfer sheet according to the present invention, and FIG. 3 is a sectional view of the pattern transfer label. 1 ... Design transfer sheet 2 ... Release sheet 3 ... Design layer 4 ... Adhesive layer 5 ... Release layer 6 ... Protective layer 7 ... Anchor layer 11 ... Design transfer label 12 ... Base sheet 13 ...... Adhesive layer 14 ...... Release paper

Claims (1)

[Claims] 1. A pattern layer on a release sheet as a support,
A pattern transfer sheet in which an adhesive layer is sequentially laminated, and a hologram having a light-reflecting metal layer provided on an adherend,
The adhesive layer and the hologram surface are overlapped so that they face each other, and they are heated and pressure-bonded or pressure-bonded so that cracks do not occur in the light-reflecting metal layer forming the hologram, and adhesion that is transparent enough to allow the hologram to be seen through. A method for forming a hologram with a pattern, comprising: transferring a pattern layer onto the surface of the hologram via an agent layer.