JP4942685B2 - Hologram and method for manufacturing hologram - Google Patents

Description

  The present invention relates to a hologram that exhibits a three-dimensional appearance or shines in a rainbow color, and a method for manufacturing the hologram.

As is well known, the basics of holograms are to apply two types of laser light, object light and reference light, to an object at the same time, and use interference fringes caused by misalignment of the light at this time, which can be applied to special films or plastics. It is recorded on a board. The hologram is used for decoration in a wide range of packages, wrapping paper, posters and the like because of its unique aesthetics, in addition to being used for preventing counterfeiting. In recent years, a technology that can be manufactured at low cost by using a belt-like film as an ultraviolet curable resin and a hologram base material has been developed, and its use is expanding as a simple decorative form (Patent Documents 1 and 2). ).
JP-A-5-2322853 JP-A-8-36352

  However, in such a transparent hologram, if dirt such as sweat, oil or dirt on the hand adheres to the ultra-fine irregularities transferred to the surface of the UV curable resin, the irregularities are buried with dirt such as oil and grease, and the holography is lost. There was a drawback that the effect could not be demonstrated. In order to make up for this drawback, there is a method of depositing metal on ultra-fine irregularities, but this requires a large amount of processing equipment and work, and it is not practical to use it for consumer goods such as packages and wrapping paper. Absent.

  Therefore, the present invention is intended to provide a hologram that has a simple structure and does not easily lose the brightness of holography even when dirt such as sweat or oil on hands is attached, and a method for manufacturing the hologram. is there.

The present invention has been proposed in view of the above, and according to the present invention, the hologram layer comprising ultra-fine irregularities is formed on the surface of the support substrate,
The hologram is characterized in that a protective layer is formed on the hologram layer, including a reflective particle having a particle size that does not enter into the concave portion of the ultra-fine irregularities so that light can reach the hologram layer straight.

  According to a second aspect of the present invention, the protective layer is a porous protective layer having ultrafine vacancies that allow light to reach the hologram layer straight and including the reflective particles in a layer that is out of the ultrafine vacancies. The hologram according to claim 1, wherein the hologram is provided.

  According to a third aspect of the present invention, there is provided the hologram according to the first aspect, wherein the protective layer is formed by aluminum printing including aluminum grains as reflection grains.

  According to a fourth aspect of the present invention, there is provided the hologram according to any one of the first to third aspects, wherein the porous protective layer is formed by ultra fine gradation printing.

  According to a fifth aspect of the present invention, in the protective layer, the protective layer is formed by mesh printing using an ink containing aluminum particles as reflective particles. It is a hologram.

  According to a sixth aspect of the present invention, an IC tag is disposed on the back surface side of the support base material on which the hologram layer is formed, and the IC tag is concealed by a reflective particle of a protective layer formed on the hologram layer. A hologram according to any one of claims 1 to 5.

What is described in claim 7 is an ultraviolet curable resin coating step in which a coating film is formed by applying an ultraviolet curable resin not containing a solvent to a support substrate;
A pressure-bonding step in which the support substrate on which the coating film is formed and an endless master film having ultraviolet transparency and constituting a hologram substrate are pressure-bonded to transfer the ultra-fine irregularities of the hologram substrate to the coating film;
A resin curing step of curing the coating film on the surface of the supporting substrate by irradiating ultraviolet rays through the master film with the supporting substrate attached to the master film,
A peeling step of peeling the master film from the support substrate;
A protective layer forming step of forming a protective layer including a reflective particle having a particle diameter that does not enter the concave portion of the ultra fine unevenness on the hologram layer formed of the ultra fine unevenness formed on the surface of the peeled support substrate;
A method for producing a hologram, comprising:

  According to the present invention, even if dirt such as sweat or oil on hands adheres to the surface of the hologram, the dirt adheres to the protective layer and is difficult to reach the lower hologram layer, and light is transmitted through the protective layer. The light reaches the hologram layer and the reflected light reaches the eyes of the viewer. Therefore, even if dirt adheres, the hologram effect is easy to maintain and difficult to disappear. Since the protective layer is simply formed on the hologram layer, the configuration is simple and the manufacture is easy. For this reason, the manufacturing apparatus is simple and easy to work, and can be provided at low cost.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing a schematic configuration of a hologram manufacturing apparatus.
In the embodiment of the manufacturing apparatus 1, a long film is used as the support substrate 3 for forming the hologram layer 2, and the hologram ultrafine irregularities 4 are transferred to an ultraviolet curable resin applied to the surface of the film to generate a hologram. 5 and so on. The film as the support base 3 is held on the supply-side stand 6 while being wound on the upstream side of the apparatus, and the support base 3 unwound from the supply-side stand 6 is supported by the support roller 7. It is conveyed to the ultraviolet curable resin coating device 8 on the downstream side. In addition, the support roller 7 or the support plate 9 or the like appropriately arranged on the downstream side including the support roller 7 constitutes a support base material 3 transport device as a whole, and a resin coating device 8 (to be described later) and the like are in the middle of the transport. An ultraviolet curing device 10, a peeling device 11, and a printing device 12 are sequentially provided, and a winding stand 13 that winds up the support base material 3 is disposed at the most downstream end. In addition, the support base material 3 is not limited to a long film, A sheet | seat, paper, etc. may be sufficient. Further, the printing device 12 is not limited to the in-line in which a series of steps relating to hologram formation are continuously performed, but may be a so-called offline that is performed separately.

  On the other hand, a master film 15 constituting a hologram substrate is guided by guide rollers 16 to be stretched endlessly. The guide rollers 16 and the driving roller 16 'constitute a master film transport device, and a curing device 10 and a peeling device 11 described later are sequentially provided during the transport of the master film 15 by the guide rollers 16. In addition, the master film 15 has ultraviolet transmissivity. Further, in the present embodiment, the master film 15 is configured to be endless and can be used repeatedly. However, the master film 15 wound in a roll shape is used by rewinding on one side, and the used master film 15 is wound on the other side. A one-way usage method may be used.

  As shown in FIG. 2, the hologram substrate (master film) 15 is a surface of a support film 15a such as a polyester film or a polypropylene film (the surface that becomes the outer surface when stretched), and the lower surface in FIG. ), A releasable resin layer 15b is formed, and a hologram recording surface having ultra-fine irregularities 17 of about 2500 angstroms is formed on the surface, and this hologram recording surface is used as a transfer plate. . The master film 15 is also called a print master, and is a copy for mass production of an original master that is an original plate. This can be used repeatedly a plurality of times, but if it is used repeatedly for a certain number of times, the fine irregularities on the surface of the hologram 5 will become dull, so it is replaced with a new one.

  The above-described resin coating apparatus 8 includes a tank 20 that contains an ultraviolet curable resin solution, a roller 22 that uniformly applies the ultraviolet curable resin solution in the tank 20 to the surface of the application roller 21, and the like.

  The coating roller 21 has a coating sheet (coating plate) wound around the surface in a state of slightly protruding from the outer peripheral surface of the coating roller 21 so as to be detachable, and the roller 22 applies UV curable resin onto the coating sheet surface. When the coating sheet surface is configured to apply the ultraviolet curable resin to the support base material 3, the coating sheet is cut into a desired shape, and the ultraviolet curable resin is applied only to the desired region of the support base material 3. Thus, a desired coating film can be partially formed.

  Further, the curing device 10 described above includes an upper pressure roller 23a that is in contact with the master film 15 and rotates in accordance with the transport direction of the master film 15, and a lower pressure roller provided below the upper pressure roller 23a. 23b and the ultraviolet irradiation device 10 'arranged on the downstream side of the pressure rollers 23a and 23b, and the master film 15 and the support base material 3 conveyed between the pressure rollers 23a and 23b are overlapped. Pinch. Therefore, when the support base material 3 having the surface formed with the ultraviolet curable resin coating film passes between the pressure rollers 23a and 23b, the support base material 3 is formed on the ultraviolet curable resin coating film on the hologram surface ( The ultra-fine irregularities 17) are transferred and brought into close contact with each other, and are conveyed along with the movement of the master film 15 in this close contact state. Then, when passing under the ultraviolet lamp of the ultraviolet irradiation device 10 ′, it is irradiated with ultraviolet rays through the master film 15, and the ultraviolet curable resin of the support substrate 3 is cured by this ultraviolet irradiation to become the hologram layer 2.

  The upper pressure roller 23a may be made of, for example, an ultraviolet light transmissive material such as a glass tube, and provided with an ultraviolet irradiation device 10 'inside so as to perform ultraviolet irradiation simultaneously with the clamping pressure. . In this embodiment, an ultraviolet curable resin is used. However, another hologram curing resin may be applied to transfer hologram ultra-fine irregularities.

  The peeling device 11 may have any configuration as long as the supporting substrate 3 can be separated from the master film 15. In this embodiment, the transfer direction of the master film 15 is forcibly changed to the peeling direction by the guide roller 16 ″, and the supporting substrate 3 is suppressed from being pulled by the pressing roller 24 and peeled from the direction-changed master film 15. The peeling device 11 may be configured to be provided with a nail or the like for applying an external force to the transported support base 3 and peeled off by the force of the nail, or by blowing air. You may let them.

  Here, as the ultraviolet curable resin, for example, an alkali-soluble resin such as polyvinyl alcohol or acrylic / styrene is used, and it is most preferable that the resin does not contain a solvent. Hereinafter, it is preferably adjusted to 5% by weight or less. If the solvent exceeds 10% by weight, the amount of penetration when the support base material 3 is paper increases, and the expected gloss cannot be obtained unless the coating amount is increased, and a drying step is required. turn into. In addition, since the ultraviolet curable resin which does not contain a solvent as described above or the solvent is adjusted to 10% by weight or less substantially does not contain a solvent, it is generally called a solventless ultraviolet curable resin. In the present invention, this solventless UV curable resin is used.

  This is to prevent the master film 15 from being eroded by the solvent and damaging the hologram surface provided on the master film 15 (the surface of the ultra-fine irregularities 17 formed on the releasable resin layer 15b). This is to prevent the resin from penetrating into the support base 3.

  Thus, when the ultraviolet curable resin is a solvent-free system that does not substantially contain a solvent, the master film 15 is not damaged, so that the master film 15 can be used repeatedly as a plate of the hologram 5. Further, since the resin does not penetrate into the support base 3, sufficient gloss can be obtained even if the amount to be applied is small.

Next, the printing apparatus 12 will be described.
As shown in FIGS. 3B and 3C, the printing apparatus 12 is configured such that light is applied to the hologram layer 2 on the hologram layer 2 of the ultra-fine irregularities 4 formed by transfer on the surface of the support substrate 3 that has been peeled off. A protective layer 32 having the ultrafine pores 30 that can be reached in a straight line and including the reflective particles 31 having a particle diameter that does not enter the recesses of the ultrafine irregularities 4 in the layer that is out of the ultrafine pores 30 It is.

  The protective layer 32 is, for example, formed by using a paste containing aluminum particles 31a functioning as the reflective particles 31 and coating the ink to form a layer. In this case, the aluminum particles 31 a has a particle size of about 4 to 20 μm and is adjusted to a particle size that does not enter the recesses of the ultrafine irregularities 4. In order to improve the luminance, generally, as shown in FIG. 3 (a), the aluminum particles are crushed to increase the luminance (the degree of gloss), which is preferable in terms of increasing the luminance. However, the holographic effect is difficult to obtain because the ultrafine holes 30 are difficult to be formed. However, even in this case, since the light passes through the collapsed aluminum, it is possible to obtain a holographic effect, but the effect is low. Therefore, as shown in FIGS. 3B and 3C, if the coating is performed without crushing the grains 31a and without orienting the grains 31a, the ultrafine holes 30 are easily formed, so that the hologram effect is easily obtained. . Specifically, as shown in FIG. 3B, even when printing with an ink application rate of 100%, a gap is formed between the grains 31a and 31a, and this gap becomes an ultrafine hole 30 to refract light. Without passing through, the light from the outside reaches the ultra-fine irregularities 4 through the ultra-fine cavities 30, is reflected here and then reaches the viewer's eyes through the ultra-fine cavities 30 and is visually recognized. Thereby, the holographic effect can be secured. When the ink components are adjusted such that the aluminum particles 31 a float on the surface of the thickness of the protective layer 32, the aluminum particles 31 a are evenly distributed in the thickness of the protective layer 32. Higher brightness than the case can be exhibited. As shown in FIG. 3C, when mesh printing is performed, gaps are further increased by the mesh, that is, the number of holes through which light passes is increased, and the amount of incident light and reflected light is increased, thereby ensuring a holographic effect. Is obtained. Further, since the aluminum particles 31a having a particle diameter that does not enter the recesses of the ultrafine irregularities 4 exist in the hologram layer 2 outside the ultrafine holes 30 as the reflective particles 31, light is transmitted by the aluminum particles 31a. Reflect to increase brightness to shine by holographic effect. Moreover, since the aluminum particles 31a do not enter the recesses of the ultrafine irregularities 4 of the hologram layer 2, they do not hinder the reflection of light at the ultrafine irregularities 4 that cause the holographic effect. And since aluminum grains are not made into a paste and do not become finer, the specific gravity is small compared to other metals, and when applied, it tends to float in the coating film (protective layer). It is suitable as a reflective particle of the protective layer 32 having the ultrafine pores 30 that pass therethrough.

  Also, if the aluminum grains are flake shaped, they will overlap in parallel when forming the coating, causing a leafing phenomenon in which the coated surface looks like a metal surface. Therefore, the non-leafing type where the aluminum grains do not float is more effective. Can be relatively increased, which is preferable.

  The reflective particles 31 are not limited to the aluminum particles 31a, and may be any substance having a function of reflecting light. For example, copper, nickel, a translucent metal compound, etc. may be used.

  When such a protective layer 32 is printed, even if the surface is touched with a hand and dirt such as sweat or oil adheres, most of the dirt only adheres to the surface of the protective layer 32. It does not reach the ultra fine irregularities 4. Therefore, even if dirt adheres to the surface of the hologram 5 and the luminance is lowered, as described above, the holographic effect can be obtained by the light passing through the ultrafine holes 30 that remain without being blocked.

  In addition, in the case of printing using a general ink containing a pigment or the like as the reflective particle 31, if the mesh printing is performed with an ink application rate of 60% or more, the portion where the pigment or the like is present increases and the gap that forms the ultrafine pores 30. In this ultrafine hole 30, light does not pass sufficiently, and the holographic effect is reduced. If the ink application rate is 40% or less, the holographic effect can be obtained. On the other hand, if it is 20% or less, there are too many gaps (ultrafine pores 30) between the reflective particles, and sweat and oils and fats in the hands fill the fine irregularities through the gaps, and the protective effect is lost.

  On the other hand, as described above, when the ink containing the aluminum particles 31a is used, the light is transmitted through the aluminum particles 31a even when the ink application rate is 100%, so that the holographic effect is exhibited. When a gap is positively formed by mesh printing with this ink, a high holographic effect can be realized by light passing through the mesh gap.

  As shown in FIG. 4, when the IC tag 40 is arranged on the back surface side of the support base 3 on which the hologram layer 2 is formed, the reflective particles 31 of the protective layer 32 formed on the hologram layer 2, In this case, the IC tag 40 can be concealed by the reflection of light by the aluminum particles 31a, and the IC tag 40 can be made difficult to be directly recognized by consumers or the like. Therefore, the inconvenience that the appearance of the product is damaged by attaching the IC tag 40 can be solved. In FIG. 4, reference numeral 41 denotes a base material (for example, cardboard) such as a packaging box.

Next, a method for manufacturing the hologram 5 according to the present invention using the hologram manufacturing apparatus 1 having the above configuration will be described.
First, the master film 15 as a hologram substrate is conveyed endlessly while being guided by a guide roller 16...

  Further, a long film as the support substrate 3 is supplied, conveyed by a support substrate conveyance device such as the support roller 7, etc., and passes through the application roller 21 of the resin application device 8 on the way, so that a solventless UV curable resin is obtained. Is applied. That is, an ultraviolet curable resin coating process is performed in which the solvent-free ultraviolet curable resin is applied to one surface of the transported support base 3 by the rotation of the application roller 21. When the resin solution is applied, the application amount of the application roller 21 is determined by a known means such as a doctor roller, and an application film having a thinner and uniform thickness than the conventional one is formed on the support base 3 (long film). It is formed.

  The support base 3 on which the coating film of the resin solution is formed as described above is conveyed between the pressure rollers 23a and 23b arranged in the vicinity of the downstream side of the resin coating apparatus 8.

  On the other hand, the master film 15 is conveyed in an endless manner while being guided by guide rollers 16... And passes between the upper and lower pressure rollers 23 a and 23 b together with the support base 3, so that the master film 15 and the support base 3 are connected. A pressure bonding process is performed in which the films are bonded together through the coating film.

  And the ultraviolet-ray from the ultraviolet-curing apparatus 10 is irradiated to the coating film in the state crimped | bonded to the surface of the support base material 3 through the master film 15, and the resin hardening process which hardens the coating film on the surface of the support base material 3 is performed. . As described above, since the master film 15 and the supporting base material 3 are sandwiched between the pressure rollers 23a and 23b and the coating film is cured immediately after the coating film is pressure-bonded to the supporting base material 3, the supporting base material 3 is made of paper. Even if it is, UV curable resin is hardly impregnated in the support base material 3. Therefore, even if the coating amount of the ultraviolet curable resin is small, the hologram surface (ultrafine irregularities 17 for hologram) formed on the master film 15 is reliably transferred as the hologram layer 2 to the surface of the support base 3 on the coating film. The

  The hologram surface 2 having the hologram surface (ultra-fine irregularities 17) transferred to the coating film is formed, and when this is cured, the support substrate 3 is conveyed to the peeling device 11 in close contact with the lower surface of the master film 15, and this peeling is performed. It peels from the master film 15 with the apparatus 11. That is, a peeling process is performed by the peeling apparatus 11.

  When the peeling step is completed, a porous protective layer forming step is then performed in which the porous protective layer 32 is transported to the printing device 12 and the porous protective layer 32 is formed on the hologram layer 2. The printing of the porous protective layer 32 includes particles having ultrafine cavities 30 that allow light to reach the hologram layer 2 straight and not entering the recesses of the ultrafine concavo-convex 4 in a layer outside the ultrafine cavities 30. Any printing may be used as long as the porous protective layer 32 including the reflective particles 31 having a diameter can be formed. For example, it is possible to appropriately select aluminum printing such as gravure, flexo, gradation, and rough coating, ultra fine gradation printing such as offset, gravure, flexo, and screen, and net-like printing using ink containing aluminum powder.

  The support base material 3 on which the hologram layer 2 is formed as described above and the porous protective layer 32 is formed thereon is formed in a log shape by the winding stand 13 constituting the final stage of the support base material transport apparatus. It is wound up. And if it winds up by the roll of a predetermined | prescribed magnitude | size, it will remove from the winding stand 13, will be conveyed to a storage location, and will be stored.

  In the above-described embodiment, the resin coating apparatus 8 including the coating roller 21 is shown. However, the resin coating apparatus 8 uniformly coats the surface of the support base 3 with an ultraviolet curable resin with a predetermined thickness. For example, a form in which an ultraviolet curable resin paint is applied by spraying, a gravure, a flexo, a bar coater, or the like may be used.

  In the illustrated embodiment, a long continuous film is used for the support base 3, but the present invention may be a sheet. In addition, since it does not heat-dry after apply | coating an ultraviolet curable resin, even if it uses a plastic sheet as the support base material 3, shrinkage of a plastic sheet can be prevented.

It is schematic structure explanatory drawing of the manufacturing apparatus of a hologram. (A) is sectional drawing of a master film, (b) is sectional drawing of a hologram. (A) is a cross-sectional view of a hologram in which aluminum particles are crushed to increase the brightness to form a porous protective layer, (b) is a cross-sectional view of a hologram in which a porous protective layer is formed in a solid with ink containing aluminum particles, c) is a cross-sectional view of a hologram in which a porous protective layer is formed by mesh printing with ink containing aluminum particles. It is sectional drawing of the hologram which concealed the IC tag.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hologram manufacturing apparatus 2 Hologram layer 3 Support base material 4 Ultra fine unevenness | corrugation of hologram 5 Hologram 6 Supply side stand 7 Support roller 8 Resin coating apparatus 9 Support plate 10 Curing apparatus 11 Peeling apparatus 12 Printing apparatus 13 Winding stand 15 Master film 16 Guide roller 17 Super fine unevenness 20 of master film 20 Tank 21 Application roller 22 Roller 23 Pressure roller 24 Pressing roller 30 Ultra fine hole 31 Reflective grain 31a Aluminum grain 32 Porous protective layer 40 IC tag 41 Base material

Claims (7)

Form a hologram layer consisting of ultra-fine irregularities on the surface of the support substrate,
A hologram characterized in that a protective layer is formed on the hologram layer, including a reflective particle having a particle size that does not enter into the concave portion of the ultra-fine irregularities so that light can reach the hologram layer straightly.   The said protective layer is a porous protective layer which has the ultrafine void | hole in which light can reach the hologram layer straight, and contains the said reflective particle in the layer remove | deviated from the ultrafine void | hole. The hologram described in 1.   The hologram according to claim 1, wherein the protective layer is formed by aluminum printing including aluminum grains as reflection grains.   The hologram according to claim 1, wherein the protective layer is formed by ultra fine gradation printing.   4. The hologram according to claim 1, wherein the protective layer is formed by mesh printing using ink containing aluminum particles as reflection particles.   6. An IC tag is arranged on the back surface side of the supporting base material on which the hologram layer is formed, and the IC tag is concealed by a reflective particle of a protective layer formed on the hologram layer. Holographic hologram. An ultraviolet curable resin coating process in which a coating film is formed by applying an ultraviolet curable resin not containing a solvent to the support substrate;
A pressure-bonding step in which the support substrate on which the coating film is formed and an endless master film having ultraviolet transparency and constituting a hologram substrate are pressure-bonded to transfer the ultra-fine irregularities of the hologram substrate to the coating film;
A resin curing step of curing the coating film on the surface of the supporting substrate by irradiating ultraviolet rays through the master film with the supporting substrate attached to the master film,
A peeling step of peeling the master film from the support substrate;
Protective layer that allows light to reach the hologram layer straight on the hologram layer composed of ultra-fine irregularities formed on the surface of the peeled support substrate, including reflective particles having a particle size that does not enter into the recesses of the ultra-fine irregularities Forming a protective layer, and
A method for producing a hologram, comprising:

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