KR100939871B1 - Label with hologram and method for preparing the same - Google Patents

Abstract

The present invention provides a label having a first film portion consisting of a base film and a printing layer, and a second film portion including a metal layer and an intermediate film, the hologram having embossing for forming holograms in the second film portion. Provide a label. According to the present invention, it is possible to produce a stable and high-speed production, and to reduce the cost, and minimize the loss that can occur during post-processing, compared to the product that forms a hologram directly on the surface of the aluminum can. In addition, there is no fear of shrinkage of the printed base film due to heat when forming the hologram on the label or curing due to heat applied to the adhesive during label production, and it is possible to secure stability of physical properties and form a hologram directly on the surface of the can. Equivalent or higher levels of hologram effect can be obtained compared to one case, which satisfactorily replaces products that form holograms directly on the surface of cans.

Label, hologram, heat shrink, innermost layer, intermediate film, primer layer

Description

LABEL WITH HOLOGRAM AND METHOD FOR PREPARING THE SAME}

The present invention relates to a label having a hologram and a manufacturing method thereof.

Hologram is a medium in which interference fringes are recorded to reproduce stereoscopic images, and has been applied to various fields including aluminum cans.

However, the conventional method of directly forming a hologram on a surface of an aluminum can or the like (can hologram method) has problems such as poor printing, post-processing defects, and cost loss as well as high manufacturing cost and difficulty in use.

Therefore, conventionally, a method of forming a hologram on a label other than the surface of the can ("hologram label") and attaching it to the can is used.

However, labels with holograms have a smaller hologram effect than forming holograms directly on the can surface.

In addition, the inventors of the present invention, there is a problem of printability due to the shrinkage of the heat having a conventional hologram formed by the hologram, and also the problem of curing due to heat applied to the pressure-sensitive adhesive, deterioration of physical properties due to other environmental factors, etc. The present inventors have found that they have various problems, and have been studied to improve them.

An object of the present invention is to provide a hologram that is stable and high-speed production, and can reduce the cost, and minimize the loss that can occur during post-processing, compared to products that form a hologram directly on the surface of an aluminum can, etc. It is to provide a label and a method of manufacturing the same.

Another object of the present invention, there is no problem of printability due to the shrinkage of the label due to heat generated when the hologram is formed on the label, no curing problem due to the heat applied to the pressure-sensitive adhesive during label production, and can ensure the stability of physical properties. Compared to the case where the hologram is directly formed on the surface of the can, a hologram effect having an equal or higher level can be obtained. To provide

In order to achieve the above object, in the present invention, in the label provided with a hologram, the label comprises a first film portion consisting of a base film and a printing layer formed below the base film; And a second film portion formed under the first film portion and including a metal layer and an intermediate film, wherein the embossing process for forming a hologram is performed on the second film portion. To provide.

In an embodiment of the present invention, the base film is a polypropylene film having a thermal shrinkage of 1% or less in the film longitudinal direction.

In an embodiment of the invention, the metal layer is a deposited layer of metal.

In an embodiment of the present invention, the intermediate film is a polypropylene-based film or the skin layer is made of polyethylene and the remainder is a film made of polypropylene.

In an embodiment of the present invention, the polypropylene film is a milky white polypropylene film.

In an embodiment of the present invention, the milky white polypropylene-based film is a milky white biaxially stretched polypropylene film containing a pearl pigment.

In an embodiment of the present invention, the milky white polypropylene-based film further includes calcium carbonate, titanium oxide and an anti-blocking agent in addition to the polypropylene-based resin.

In an embodiment of the present invention, the second film portion is composed of the metal layer and the intermediate film formed under the metal layer, and part of the intermediate film itself is embossed for hologram formation.

In the embodiment of the present invention, the intermediate film has a three-layer structure of the intermediate layer and the skin layer on both sides, the embossing for forming the hologram is formed on the skin layer, the base resin of the embossed skin layer is It is preferable that it is a polyethylene, a copolymer of propylene ethylene, a terpolymer of ethylene-butene-1-propylene, or a polypropylene random polymer, and it is more preferable that the said resin has a melting temperature of 130 degrees C or less.

In an embodiment of the present invention, the second film portion is made of the metal layer, the primer layer formed under the metal layer and the intermediate film formed under the primer layer, the primer layer is embossed for hologram formation Is performed.

In an embodiment of the present invention, the primer layer is made of butyral resin or polyethylene resin.

In an embodiment of the present invention, the thickness of the primer layer is 1 to 5㎛.

In order to achieve the above object, in the present invention, a method for producing a label having a hologram, comprising: a first step of forming a first film portion by forming a printing layer under the base film; And a second step of forming a second film portion including a metal layer and an intermediate film under the first film portion, wherein the second film portion comprises a hologram for performing an embossing process for forming a hologram. Provide a method.

In an embodiment of the present invention, in the second step, a part of the intermediate film itself is preheated, and the embossing process for forming the hologram is pressed by a mold for hologram forming in which an embossed piece is carved on a part of the preheated intermediate film itself. After the metal deposition is performed on the intermediate film on which the embossing treatment for forming the hologram is performed.

In an embodiment of the present invention, in the second step, forming a primer layer on the intermediate film, preheating the primer layer, the hologram by pressing with a mold for forming a hologram embossed on the preheated primer layer After forming embossing treatment, metal deposition is performed on the primer layer on which the hologram forming embossing treatment is performed.

In an embodiment of the present invention, the thickness of the embossed portion is 0.1 to 0.5 mu m.

In an embodiment of the present invention, the first film portion and the second film portion are laminated by adhering with a urethane or acrylic adhesive.

According to the present invention, it is possible to produce a stable and high-speed production, and to reduce the cost, and minimize the loss that can occur during post-processing, compared to the product that forms a hologram directly on the surface of the aluminum can. In addition, there is no problem of printability due to heat when forming the hologram on the label or curing due to heat applied to the adhesive during label production, and it is possible to secure the stability of the physical properties and to prepare the hologram directly on the surface of the can. Equal or higher levels of hologram effect can be achieved, providing a satisfactory alternative to products that form holograms directly on the surface of cans.

Hereinafter, the label provided with the hologram and the manufacturing method thereof according to the present invention will be described in detail.

In the present invention, a label having a hologram treatment on a label other than the can itself, but having a first film portion and a second film portion formed under the first film portion, wherein the first film portion side on which the base film and the print layer are formed Instead, the embossing for hologram processing is performed in the second film portion.

Accordingly, when printing on the substrate film (usually called first paper feed) side of the first film portion and hologram processing thereon, the shrinkage of the printing layer occurs due to heat, thereby improving the defects.

In addition, the intermediate film is formed on the second film portion separately from the base film of the first film portion, and the hologram treatment is embossed on a part of the intermediate film itself or a layer adjacent to the intermediate film (for example, a primer layer to be described later) instead of the base film. When the treatment is performed, the intermediate film, not the base film, may include or support the hologram treatment layer in part, thereby preventing the shrinkage of the label and the resulting printability, the occurrence of curling, and the possibility of deterioration of the property. In addition, in particular, hologram processing is facilitated.

Furthermore, in the present invention, after forming the hologram forming embossing treatment on the intermediate film and the primer layer, the hologram effect can be improved by providing a metal deposition treatment layer on the embossed layer. If the metal layer is formed at the lowermost portion of the first film portion and the embossed layer for hologram formation is formed in the second film portion so as to be adjacent to the first film portion, the metal layer is formed on the embossed layer for hologram formation. Instead of being immediately adjacent, the adhesive layer formed according to the lamination of the first film portion and the second film portion and the embossing layer for forming the hologram are in contact with each other, whereby the hologram effect may be lowered. Therefore, in the present invention, it is particularly preferable to laminate the second film portion and the first film portion on which the metal is deposited after the embossing process for forming the hologram.

In addition, in this invention, what becomes a base film (usually called secondary paper) of the said 2nd film part is called "intermediate film."

1 is a schematic diagram illustrating a label with a hologram according to an embodiment of the present invention.

As shown in FIG. 1, in the label according to the embodiment of the present invention, the base film 10 and the print layer 20 forming the outermost layer form a first film portion F1, and the first film portion ( A lower portion of the metal layer 30, a primer layer 50 on which the embossing process 40 for forming the hologram is performed, and the intermediate film 60 form a second film portion F2. The said 1st film part F1 and the 2nd film part F2 are laminated.

Figure 2 is a schematic diagram showing a label with a hologram according to another embodiment of the present invention.

The label of FIG. 2 is the same as the other part of the label of FIG. 1 but differs in whether the primer layer is formed and the position of the embossed portion for forming the hologram.

That is, referring to FIG. 2, the label of FIG. 2 does not have a primer layer on the second film part F2, and the embossing process 40 for hologram formation has a skin layer of the intermediate film 60 itself under the metal layer 30. It is made at 70.

First, when the first film portion F1 is described in detail, the base film 10 uses a polyethylene terephthalate film or a polypropylene film, and in particular, it is preferable to use a stretched polypropylene film having heat resistance.

The polypropylene film is particularly preferably a film having a thermal contraction rate of 1% or less in the longitudinal direction of the film (TD direction). When such a film is used, workability, dimensional stability, and wrinkles are less affected by temperature during laminating or printing. The related characteristics are excellent. In particular, the cured mitigation effect by the adhesive during the lamination process or labeling is great.

In the base film 10, the film thickness does not have a great influence, but it is preferable that the film thickness is 12 to 50 µm.

The printing layer 20 is formed by ink using a solvent such as methyl ethyl ketone or ethyl alcohol to form desired text, design, and the like. In the printed layer 20, it is preferable to improve the adhesive force by using a curing agent for the following metal layer deposition.

Next, when the second film portion F2 is described in detail, the metal layer 30 is preferably a metal deposition layer on which Cu, Fe, Sn, Zn, Ag, Al, and the like are deposited. Deposit. If the deposition thickness is 200 GPa or less, the deposition uniformity is not good, and if the deposition thickness is 500 GPa or more, surface cracks occur during the lamination process.

On the other hand, the metal deposition layer should not be separated when the surface scotch test using a 25mm tape.

The primer layer 50 is formed by coating with a primer such as butyral resin (Butyral Resin), polyethylene resin. When the primer layer 50 is formed, since the embossing process 40 for hologram formation is performed, the coating thickness thereof is preferably 1 to 5 μm. When the coating thickness is 1 μm or less, when the embossing process for hologram forming is performed, embossed marks are also displayed on the intermediate film side, and the coating becomes rugged. When the coating thickness is 5 μm or more, the desired hologram effect does not appear and thus reproducibility is difficult to obtain. .

As the intermediate film 60, a polypropylene film, particularly a milky white polypropylene film, is used. Alternatively, as the intermediate film 60, a skin layer is made of polyethylene, and the remaining film is made of polypropylene.

In the present invention, in particular, as the intermediate film 60, by providing a milky white polypropylene-based film on the back of the metal deposition layer it is possible to further maximize the improved holo effect.

The milky white polypropylene (White Opaque Oriented Polypropylene) film is a milky white biaxially oriented polypropylene film containing a pearl pigment. The film includes the pearl pigment and has excellent mechanical properties such as tensile strength, elongation, and firmness, and improves glossiness. Accordingly, when the hologram is formed on the second film portion side, it is possible to give an excellent hiding force and also excellent in the curing properties.

In addition, the intermediate film 60 made of the milky white biaxially stretched polypropylene film may further include calcium carbonate, titanium oxide, and an anti-blocking agent in addition to the polypropylene resin. In addition to the resin, pores are formed by including calcium carbonate and titanium oxide. In addition, the blocking agent prevents the blocking phenomenon (the phenomenon of sticking to each other by the load of the film during production). As the anti-corrosion agent, silica is commonly used.

When the primer layer is coated on the intermediate film 60, it is preferable that the surface tension is 38 dynes or more so that the liquid primer can be stably coated due to the surface tension.

On the other hand, in the present invention, when the primer layer 50 is not formed on the intermediate film 60, the embossing process 40 for hologram formation is performed on a part of the intermediate film 60 itself (see FIG. 2). The intermediate film is preferably produced by three layers of coextrusion.

The intermediate film 60 is provided with a skin layer 70 on which the embossing process 40 for hologram formation is performed, and the base resin of the embossing skin layer 70 is polyethylene, copolymer of propylene-ethylene, ethylene- It is preferable to include a resin of any one of a terpolymer of butene-1-propylene or a polypropylene random polymer because the embossing process for forming a pattern alone is easy. Among the resins, a resin having a melting temperature of 130 ° C. or less is particularly soft when heat is applied when forming a hologram, and thus, a holo pattern is easily formed. On the other hand, in the case of a homopolypropylene having a melting temperature of more than 130 ° C., for example, a melting temperature of 160 ° C., it is difficult to form a holo pattern because it does not become soft even when heat is applied to form a hologram.

The hologram forming embossing process 40 is performed as follows.

As described above, the embossing process for hologram formation is performed on the primer layer 50 on the intermediate film 60, or the embossed skin layer 70 is formed on the intermediate film 60 itself.

In the embossing process, for example, an embossed hole is used to attach a pattern to the engraver (master), which is a mold for hologram molding.

The hologram forming embossing process is performed by pressing the preheater to the preheated primer layer 50 or the embossing skin layer 70 with an engraver (master) which is the hologram forming mold.

The depth of the embossed 40 layer depends on the primer layer 50 or the embossed skin layer 70, but is preferably 0.1 to 0.5 μm. If the depth is 0.1 μm or less, the embossing is not good and the hologram effect does not occur. When the depth is 0.5 μm or more, a phenomenon in which the intermediate film is recessed occurs. The embossing treatment was carried out to 0.1 to 1 탆, and the hologram effect was particularly excellent at 0.1 to 0.5 탆, but the depression of the intermediate film was prevented. Therefore, it turned out that it is preferable to set the depth of the embossing process 40 layer to 0.1-0.5 micrometer.

After performing the hologram forming embossing process 40 as described above, a metal layer is formed by depositing a metal on the intermediate film or primer layer subjected to the hologram forming embossing process. Accordingly, the hologram can be protected and the hologram effect can be maximized.

The first film part F1 and the second film part F2 are laminated using an adhesive. The adhesive is a one-component adhesive, for example, a urethane-based or acryl-based adhesive that is hardened by reacting with water in the air or adsorbed water on the surface of the film, the terminal being made of isocyanate.

[Examples and Comparative Examples]

Each Example and the comparative example film was comprised as follows.

Example  One

Base film 10 (OPP film having a thermal contraction rate of 0.5% in the film longitudinal direction) / printing layer 20 / aluminum deposition layer 30 / a primer layer of butyral resin subjected to embossing 40 for hologram formation ( 50) / intermediate film (60; milky OPP film) [See FIG. 1]

Example  2

Base film 10 (OPP film having a thermal contraction rate of 0.5% in the film longitudinal direction) / printing layer 20 / aluminum deposition layer 30 / embossed skin layer 70, wherein the skin layer is made of polyethylene resin. An intermediate film 80 made of a polypropylene resin and the remaining part thereof (see FIG. 2).

Comparative example  One

The film structure of Comparative Example 1 is shown in FIG. 3. Referring to FIG. 3, the film of Comparative Example 1 is a butyral on which a base film 1 (OPP film having a thermal contraction rate of 0.5% in the film longitudinal direction) / printed layer 2 / embossing process for hologram formation 4 is performed. It is laminated | stacked in order of the primer layer 5 / aluminum vapor deposition layer 3 / intermediate film 6 (milky white OPP film) of resin.

Comparative example  2

The film structure of the comparative example 2 is shown in FIG. Referring to FIG. 4, the film of Comparative Example 2 is a substrate film (1 (OPP film having a thermal shrinkage of 0.5% in the film longitudinal direction) / printed layer 2 / aluminum deposition on which the embossing process 4 for hologram formation was performed). It is laminated | stacked in order of the layer 3 / intermediate film 6 (milky white OPP film).

[Experiment 1: Heat Resistance Test]

Prepared several Examples and Comparative Examples films [300mm × 100mm horizontal], and by using a seal bar (heat seal) the side portion by 0.5 seconds to heat the side portion at intervals of 10 ℃ to 120 ℃ ~ 160 ℃ by temperature I saw the direction of curry and the degree of curry.

Curing direction is "good" that the end of the sample rises upward, the innermost layer second film portion side is the upper side, the outermost layer (the first film portion side) is lower. In addition, when the degree of curry is placed on the floor 2cm or less was considered that the curry did not occur (see Fig. 5).

The experimental results are shown in Table 1 below. In Table 1, "o" indicates that the curing degree is 2 cm or less, and no curling occurs, and "x" indicates that the curing degree is more than 2 cm.

[Experiment 2: Interlayer Adhesion Test]

After attaching to the intermediate films of the Examples and Comparative Examples using a 25 mm tape, respectively, the surface should not be delaminated when rubbed by hand five times.

The experimental results are shown in Table 1 below. In Table 1, "o" indicates that no peeling occurred, and "x" indicates that peeling occurred.

[Experiment 3: Test of shrinkage of printed layer during hologram forming embossing]

Since the heat of the heater during the embossing is 250 ~ 300 ℃ shrinkage phenomenon of the film may occur, in particular, it was confirmed whether the shrinkage of the printed pattern in each Example and Comparative Example.

The experimental results are shown in Table 1 below. In Table 1, "○" indicates that the shrinkage of the printed pattern does not occur, and "x" indicates that the shrinkage of the printed pattern occurs.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Heat resistance test ○ ○ ○ ○ Interlayer adhesion ○ ○ × (especially the print layer and the primer layer peel off) ○ Shrinkage of Printed Layer ○ ○ X (shrinkage degree: 2-4mm) X (shrinkage degree: 3-8mm)

As can be seen from Table 1, when the embossing treatment for hologram formation was performed in the second film portion as in Examples 1 and 2, the curing degree was 2 cm or less, while the heat resistance was good, whereas in Comparative Example 2, the heat resistance was not good. It was. In addition, although the interlayer peeling phenomenon did not appear in Examples 1 and 2, in the comparative example 1, peeling phenomenon appeared because the aptitude of the printing layer and the primer layer was not good.

On the other hand, in Examples 1 and 2, after embossing the second film portion, the printed first film portion was laminated so that the shrinkage phenomenon of the printed pattern to be reproduced could not be seen. On the other hand, in Comparative Examples 1 and 2, after printing on the first film portion, the embossing treatment caused the shrinkage of the printed pattern due to the heat during the processing.

From the above experiments, the embodiment in which the embossing for hologram formation is performed on a part of the intermediate film itself or the primer layer on the intermediate film, which is the second film portion rather than the first film portion, has excellent heat resistance, no interlayer peeling, and shrinkage of the printed layer. None could be confirmed.

As described above, the present invention has no problem of printability due to shrinkage of the label or no curing problem due to heat applied to the pressure-sensitive adhesive during label production, and ensures stability of physical properties. In addition, by processing the hologram treatment on the surface of the existing can on the film itself, high-speed production is possible through labeling, and there is no problem of discarding the can and contents due to defects in hologram processing on the surface of the can. Re-labeling is possible, minimizing losses, which is economically effective. In addition, there is an advantage that the hologram effect can be easily maximized.

1 is a schematic diagram illustrating a label according to an embodiment of the present invention.

2 is a schematic view showing a label according to another embodiment of the present invention.

3 is a schematic view showing a label according to a comparative example of the present invention.

4 is a schematic view showing a label according to another comparative example of the present invention.

* Description of Major Reference Marks *

1, 10: base film 2, 20: printing layer

3, 30: metal layer 4, 40: hologram embossing

5, 50: primer layer 6, 60: intermediate film

70: embossed skin layer F1: first film portion

F2: 2nd film part

Claims (18)

In the label with a hologram, the label, A first film part comprising a base film and a printing layer formed below the base film; And a second film part formed under the first film part and including a metal layer and an intermediate film. Embossing for hologram formation is performed in the second film portion, the thickness of the embossed portion is a label with a hologram, characterized in that 0.1 to 0.5㎛. The method of claim 1, The base film is a label with a hologram, characterized in that the heat shrinkage is a polypropylene film of 1% or less in the longitudinal direction of the film. The method of claim 1, And the metal layer is a deposited layer of metal. The method of claim 1, The intermediate film is a polypropylene-based film or a label with a hologram, characterized in that the skin layer is made of polyethylene and the remainder is a film made of polypropylene. The method of claim 4, wherein The polypropylene-based film is a label with a hologram, characterized in that the milky white polypropylene-based film. The method of claim 5, wherein The milky white polypropylene film is a label with a hologram, characterized in that the milky white biaxially stretched polypropylene film containing a pearl pigment. The method of claim 5, wherein The milky white polypropylene-based film is a label with a hologram, characterized in that it further comprises calcium carbonate, titanium oxide and anti-blocking agent in addition to the polypropylene resin. The method according to any one of claims 1 to 7, The second film portion is made of the metal layer and the intermediate film formed under the metal layer, the label with a hologram, characterized in that the embossing for forming the hologram was performed on a portion of the intermediate film itself. The method of claim 8, The intermediate film has a three-layer structure of an intermediate layer and a skin layer on both sides, wherein the embossing for forming holograms is formed on the skin layer, and the base resin of the embossed skin layer is a copolymer of polyethylene and propylene-ethylene. And a resin of any one of a terpolymer of ethylene-butene-1-propylene or a polypropylene random polymer. The method of claim 9, The resin is a label with a hologram, characterized in that the melting temperature is 130 ℃ or less resin. The method according to any one of claims 1 to 7, The second film portion is made of the metal layer, the primer layer formed under the metal layer and the intermediate film formed under the primer layer, the hologram characterized in that the embossing process for forming the hologram was performed on the primer layer Label provided. The method of claim 11, The primer layer is a label having a hologram, characterized in that made of butyral resin or polyethylene resin. The method of claim 11, The thickness of the primer layer is a label with a hologram, characterized in that 1 to 5㎛. In the manufacturing method of a label provided with a hologram, A first step of forming a first film part by forming a printing layer under the base film; And And a second step of forming a second film portion including a metal layer and an intermediate film under the first film portion. Hologram forming embossing treatment in the second film portion, the thickness of the embossed portion is a method of producing a label with a hologram, characterized in that 0.1 to 0.5㎛. The method of claim 14, In the second step, a part of the intermediate film itself is preheated, and the hologram forming embossing process is performed by pressing a mold for hologram forming in which an embossed piece is engraved on the part of the preheated intermediate film itself. A method for producing a label with a hologram, characterized in that metal deposition is carried out on an intermediate film subjected to embossing. The method of claim 14, In the second step, after forming a primer layer on the intermediate film, preheating the primer layer, pressing the embossing for hologram forming by pressing with a mold for hologram molding embossed on the preheated primer layer, Method for producing a label with a hologram, characterized in that for depositing the metal on the primer layer on which the embossing process for forming the hologram was performed. delete The method according to any one of claims 14 to 16, And the first film portion and the second film portion are laminated by adhering with a urethane-based or acrylic adhesive.

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