JP2008032829A - Method for producing hologram sheet, and hologram sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a hologram sheet which does not require a light reflection layer, thus has exceedingly excellent production efficiency, and is inexpensive and economical, and also, in which an optional interference color can be exhibited and the decorative effect of a hologram is high, and to provide a hologram sheet. <P>SOLUTION: Regarding the method for producing a hologram sheet where a resin layer in a melted state extruded from an extrusion molding machine is extrusion-coated on a base material sheet, and further, the extrusion-coated resin layer in a melted state is pressed by a roll mounted with a stamper for emboss hologram formation, so as to form a hologram on the surface thereof, as the extrusion-coated resin layer in a melted state, at least two layers of a transparent resin layer to form into the surface layer of the hologram sheet and a resin layer to form into the substrate layer of the hologram, admixed with highly glossy pigment accompanied by reflected light are extrusion-coated, and an emboss hologram is formed on the transparent resin layer. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a hologram sheet and a hologram sheet. More specifically, it is obtained by embossing a hologram by pressing a roll equipped with an embossed hologram stamper on the surface of the extruded coating resin layer of the base sheet provided with a molten extruded coating resin layer extruded from an extruder. The production of an inexpensive hologram sheet that does not require a light reflecting layer and therefore does not require a metal vapor deposition step to form the light reflecting layer, is excellent in production efficiency and decoration effect The present invention relates to a method and a hologram sheet obtained by the manufacturing method.

  Conventionally, attempts have been made to provide a hologram on a cover of a book such as a magazine or a book, a pamphlet, a calendar, a record jacket, a paper / plastic package, or clothing for the purpose of decorating the appearance.

  In many cases, as a hologram, a metal thin film layer such as aluminum vapor deposition is provided on a plastic substrate and a light reflecting layer is provided, and then the surface is provided with a fine uneven shape by an embossing method, or the plastic substrate is heated and pressurized. After providing a fine concavo-convex shape by embossing by a press method or the like, a metal thin film layer such as aluminum vapor deposition provided as a light reflecting layer is used. In such a hologram, the color of the entire hologram is determined by the metal thin film layer and is usually limited to silver gray because aluminum is used, so that the color is not suitable especially when a decorative effect is required. was there.

  In addition, since an aluminum vapor deposition step provided as a light reflecting layer is involved, there are problems in terms of manufacturing efficiency and cost, and problems in hologram quality due to variations (thickness) in the aluminum vapor deposition film. Furthermore, the method of manufacturing a hologram sheet by forming a fine concavo-convex shape by embossing by a hot press method or the like as a hologram has a problem that the manufacturing efficiency is extremely poor.

  On the other hand, a method has been proposed in which an embossed hologram stamper is mounted on a cooling roll of an extrusion molding machine and pressed against the extruded molten resin (for example, Patent Documents 1 and 2). According to this method, it is possible to emboss a hologram efficiently at an extremely high speed.

However, since a process of providing a metal vapor deposition film as a light reflecting layer on the surface after embossing is required, there is a problem in manufacturing efficiency as a method for manufacturing a hologram sheet. When a metal vapor deposition film is provided as a light reflecting layer on the embossed surface, the adhesion between the resin and the metal is weak, and wet processing such as primer coating and chemical treatment for improving this adhesion is not possible. In addition, the method of performing dry surface treatment such as corona discharge treatment, glow discharge treatment, ozone treatment, plasma treatment, etc. on the resin surface has problems such as deterioration of adhesiveness over time. there were.
JP-A-62-118772 JP-A-62-192779

The present invention does not require a light reflection layer, and therefore does not require a step of performing metal vapor deposition to form the light reflection layer. The object of the present invention is to provide a method for manufacturing a hologram sheet and a hologram sheet obtained by the manufacturing method, which have a very high hologram decoration effect.

To achieve the above objectives,
According to the first aspect of the present invention, a molten resin layer extruded from an extruder is extrusion coated on a base sheet, and the molten extrusion coating is applied to a roll equipped with an emboss hologram forming stamper. A method for producing a hologram sheet by pressing a resin layer to form a hologram on a surface,
As the molten extrusion coating resin layer, at least two layers of a transparent resin layer serving as a surface layer of a hologram sheet and a resin layer to which a highly glossy pigment with reflection serving as a hologram base layer is added are extrusion coated. An embossed hologram is formed on the transparent resin layer. A method for producing a hologram sheet.

The invention according to claim 2 is a roll in which a molten resin layer extruded from an extrusion molding machine is extrusion coated onto a base sheet made of a vapor deposition film or a polarizing film, and an embossed hologram forming stamper is mounted. , A method of manufacturing a hologram sheet by pressing the molten extrusion coating resin layer to form a hologram on the surface,
A method for producing a hologram sheet, comprising forming at least a transparent resin layer serving as a surface layer of a hologram sheet by extrusion coating as the molten extrusion coating resin layer, and forming an embossed hologram on the transparent resin layer.

  According to a third aspect of the present invention, the base sheet is a base sheet formed by molding a molten sheet-like resin obtained by extruding a molten resin from an extruder. It is a manufacturing method of the hologram sheet of description.

  The invention according to claim 4 is characterized in that the highly glossy pigment with reflection is any one of a pearl pigment, a polarized pearl pigment, a polarized vapor deposition pigment, an aluminum flake, and a vapor deposited aluminum flake. 3. A method for producing a hologram sheet as described in 3.

  The invention according to claim 5 is a hologram sheet manufactured by the method for manufacturing a hologram sheet according to any one of claims 1 to 4.

  According to the first aspect of the present invention, at least two layers, ie, a transparent resin layer serving as a surface layer of a hologram sheet and a resin layer to which a highly glossy pigment with reflection serving as a hologram base layer is added, are extrusion coated. Since the embossed hologram is formed on the transparent resin layer, there is no need to provide a hologram light reflecting layer for metal deposition such as aluminum, the production efficiency is remarkably excellent, and the thickness of the hologram layer is minimized. Extremely holograms that can be suppressed, are inexpensive and economical, and that the reflected light from the high-gloss pigment contained in the hologram underlayer can generate any interference color through refraction at the hologram layer. It is possible to provide a method for producing a hologram sheet having a high decorative effect.

  According to the invention which concerns on Claim 2, thickness control by an extrusion process technique can be performed easily, and the manufacturing method of the hologram sheet which can manage quality, such as an external appearance characteristic, easily can be provided.

According to the invention which concerns on Claim 3, the manufacturing method of a hologram sheet which combines both the base material sheet of a hologram sheet and the base layer of a hologram layer can be provided by using a vapor deposition film or a polarizing film as a base material sheet. .

  According to the invention of claim 4, high gloss with reflection of pearl pigment, polarized pearl pigment, polarized vapor deposition pigment, aluminum flake, vapor deposited aluminum flake, etc., without providing a hologram light reflecting layer for vapor deposition of metal such as aluminum. By providing a resin layer containing a functional pigment as the hologram underlayer, a method for producing a hologram sheet that can express any interference color through refraction in the hologram layer and has a very high hologram decoration effect can be provided.

  According to the invention which concerns on Claim 5, the decoration body excellent in the designability and decoration effect which are used for various products can be provided.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, the best mode for carrying out the invention will be described with reference to the drawings. FIG. 1 is a schematic process diagram illustrating an example of a method for producing a hologram sheet of the present invention. FIG. 2 is a schematic process diagram for explaining another example of the method for producing a hologram sheet of the present invention. FIG. 3 is a schematic cross-sectional view of a hologram sheet showing an example of the configuration of the hologram sheet manufactured by the hologram sheet manufacturing method of the present invention. FIG. 4 is a schematic cross-sectional view of a hologram sheet showing another example of the configuration of the hologram sheet manufactured by the hologram sheet manufacturing method of the present invention.

  An example of the method for producing a hologram sheet of the present invention will be described with reference to FIG. In FIG. 1, as a molten resin layer extruded from an extruder (4) on a substrate sheet (2) unwound from a substrate sheet unwinding roll (1), An extrusion coating resin layer (6) having a two-layer structure comprising a transparent resin layer (6a) to be formed and a resin layer (6b) to which a high-gloss pigment with reflection serving as a hologram underlayer is added, 7) and extrusion coating between the nip roll (9) and pressing the transparent resin layer with a roll having the embossed hologram forming stamper plate (8) mounted on the cooling roll (7). A hologram sheet (11) formed with an uneven hologram shape and formed with an embossed hologram is taken up by a pair of take-up rolls (10, 10 '). A hologram sheet manufacturing method of the wound by Lumpur (12).

  As shown in FIG. 3, a schematic cross-sectional view of the hologram sheet produced as described above, high glossiness with reflection on the substrate sheet (43) [corresponding to the substrate sheet (2) described in the production method above]. The hologram underlayer (42) made of a resin to which the pigment (42a) is added [corresponding to the hologram underlayer (6b) described in the above production method) and a fine hologram uneven shape (41a) were formed on the surface A hologram sheet (40) in which the hologram layer (41) [corresponding to the hologram layer (6a) described in the above production method] is laminated in this order is obtained.

  The hologram sheet (40) is provided with a resin layer containing a high-gloss pigment with reflection whose hue changes depending on the viewing angle as a hologram underlayer, so that the reflected light from the underlayer is refracted by the hologram layer. The hologram sheet can exhibit any interference color and has a very high hologram decoration effect.

  As another example of the method for producing a hologram sheet of the present invention, as shown in FIG. 2, a molten state extruded from a first extruder (20) through a pair of metal rolls (23, 23 '). On the base material sheet (22), as a molten resin layer from the second extruder (24), a transparent resin layer (26a) serving as a surface hologram layer of the hologram sheet and reflection serving as a hologram underlayer are accompanied. A two-layer structure comprising a resin layer (26b) to which a high gloss pigment is added is extrusion coated with an extrusion coating resin layer (26), and a sheet is formed between a cooling roll (27) and a nip roll (29). Simultaneously with the molding, the transparent resin layer is pressed with a roll in which an embossed hologram forming stamper (28) is mounted on a cooling roll (27), so that a fine surface on the stamper surface is pressed. A hologram sheet (34) formed with a gram uneven shape and formed with an embossed hologram is taken up by a pair of take-up rolls (30, 30 ') and taken up by a take-up roll (31). is there.

  The hologram sheet manufactured as described above has the same configuration as that of the hologram sheet shown in FIG.

  Further, another example of the method for producing a hologram sheet of the present invention will be described with reference to FIG. 1. As the base sheet shown in FIG. 1, a metal vapor-deposited film or a polarizing film is used, and on this base sheet (2 ′), As a molten resin layer extruded from the extrusion molding machine (4), a transparent resin to be the surface hologram layer of the hologram sheet is extrusion coated, and an embossed hologram forming stamper (8) is mounted on the cooling roll (7). A hologram in which an embossed hologram is formed by pressing a transparent resin layer (6a), which is the hologram layer, with a roll and pressing the extrusion coating resin layer (6 ′) to form a fine hologram uneven shape on the stamper surface. The sheet (11 ') is taken up by a pair of take-up rolls (10, 10') and taken up by a take-up roll (12). It is a method of manufacturing a gram sheet.

  As shown in FIG. 4, a schematic sectional view of the hologram sheet manufactured as described above is formed on the surface of the transparent resin layer on the base sheet (53) [corresponding to the base sheet (2 ′) described in the above manufacturing method]. A hologram sheet (50) on which a hologram layer (51) [corresponding to the hologram layer (6a) described in the above production method] on which a fine hologram uneven shape (51a) is formed is obtained.

  In this hologram sheet (50), the metal vapor deposition film or polarizing film of the base sheet also has a function as a hologram underlayer, and the reflected light from the base sheet is subjected to arbitrary interference through refraction at the hologram layer. It is a hologram sheet that can exhibit colors and has a very high hologram decoration effect.

  In the hologram sheet manufacturing method of the present invention, the thickness of the hologram layer (6a, 26a) is preferably in the range of 5 to 20 μm, and the thickness of the hologram underlayer (6b, 26b) is preferably in the range of 10 to 30 μm. The average particle size of the highly glossy pigment with reflection is preferably 1 μm or less in the long side direction of the particles.

  There are no particular limitations on the extruder (20) for extruding the base sheet used in the method for producing a hologram sheet of the present invention, the extruder (4, 24) for extrusion coating, and the T-die (5, 25). A normal resin sheet molding extruder can be used.

  In addition, the embossed hologram forming stamper (8, 28) used in the present invention is made of a thin metal, and an example of the manufacturing process will be described below.

  First, interference fringes are recorded in a concavo-convex shape on a photosensitive resin by a known method such as two-beam interference by laser light. Subsequently, Au, Ag, Ni, etc. are vapor-deposited on the uneven surface, Ni plating is performed using this as an electrode to form a Ni plating layer having a thickness of about several hundreds μm, and then peeled off to obtain an original. Next, the surface of the original plate is subjected to a peeling treatment, and the formation and peeling of Ni plating is repeated a plurality of times based on this original plate, thereby making it about 700-1500 pieces / mm and depth of about 0.1-1.0 μm. A stamper having a fine uneven shape of a degree can be obtained.

  In the hologram sheet manufacturing method of the present invention, the embossing hologram stamper (8, 28) is mounted on the cooling roll (7, 27) by fixing with a heat-resistant adhesive or physically screwing. Any method can be used, such as a fixing method using a magnet, a fixing method using a magnet, or a fixing method using vacuum adsorption.

  Moreover, in the hologram sheet manufacturing method of the present invention, the cooling rolls (7, 27) need to have a function of quickly cooling the embossed hologram layer to prevent the disappearance and distortion of the emboss. For example, a metallic roll having a flow path for circulating cooling water therein can be used.

  In the method for manufacturing a hologram sheet of the present invention, the nip rolls (9, 29) are preferably rolls having a surface made of an elastic material such as urethane or silicon in order to press the molten resin with sufficient pressure. .

  The resin sheet used as the base sheet (2) used in the present invention can be arbitrarily selected. For example, specifically, resin sheets such as polyethylene resin, polypropylene resin, polyamide resin, polyvinyl chloride resin, polyester resin, polycarbonate resin, polymethyl methacrylate resin, polystyrene resin, and cellophane can be used. Unstretched, uniaxially or biaxially stretched, etc. can be arbitrarily selected and used.

  Among the above resin sheets, stretched polyethylene terephthalate (PET) and stretched polypropylene (OPP) are particularly preferable.

  Surfaces such as corona discharge treatment, glow discharge treatment, ozone treatment, and plasma treatment can be appropriately performed on the surface of the resin sheet to be extrusion coated as necessary.

  A paper-based substrate can also be used as the substrate sheet. A wide range of paper base materials can be selected depending on the application, but if the base material is not smooth, it may affect the embossing properties of the hologram. It is desirable to use paper with good smoothness such as cast coated paper.

  In addition, the metal vapor deposition film as the base sheet (2 ′) used in the present invention is preferably a metal having a high surface reflectance, such as aluminum, gold, silver, copper, tin, and the like. Alloys containing metals can be used.

  Moreover, the vapor deposition film which consists of a transparent inorganic oxide can also be used. For example, the vapor deposition film which consists of inorganic oxides, such as aluminum oxide, silicon oxide, magnesium oxide, or those mixtures, can be mentioned.

  The above vapor deposition can usually be formed by a vacuum vapor deposition method. As a heating means by vacuum deposition, an electron beam heating method, a resistance heating method, and a dielectric heating method are preferable. In the case of a vapor deposition film made of the above-described transparent inorganic oxide, a plasma assist method or an ion beam assist method can be used in order to improve the adhesion between the thin film and the substrate. Moreover, in order to improve the transparency of a vapor deposition film, the reactive vapor deposition which blows oxygen gas etc. in the case of vapor deposition can also be performed.

  In addition, examples of the polarizing film as the base sheet (2 ′) used in the present invention include polyvinyl alcohol films, ethylene vinyl alcohol films, and cellulose film polycarbonate films. A polarizing film of polyvinyl alcohol resin is preferably used. A polarizing film of a polyvinyl alcohol resin is formed by casting a stock solution in which a polyvinyl alcohol resin is dissolved in water or an organic solvent, and then stretched and dyed with iodine. Then, it is manufactured by a method of treating with a boron compound.

  In the present invention, the resin material of the base sheet in the case where the base sheet is extruded in a molten state by an extruder can be specifically selected, for example. Specific examples include polyethylene resin, polypropylene resin, polyamide resin, polyvinyl chloride resin, polyester resin, polycarbonate resin, polymethyl methacrylate resin, polystyrene resin and the like.

  Furthermore, the resin material used for extrusion coating in the present invention specifically includes, for example, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene- Vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid or methacrylic acid copolymer, methylpentene polymer, polybutene resin, polyvinyl chloride resin, polyvinyl acetate resin, Examples thereof include polyvinylidene chloride resins, vinyl chloride-vinylidene chloride copolymers, poly (meth) acrylic resins, polyacrylonitrile resins, polystyrene resins, polyester resins, polyamide resins, and polycarbonate resins.

  Among the resin materials described above, in particular, polyethylene (PE), polypropylene (PP), an ionomer (IO) obtained by crosslinking a carboxyl group of an ethylene-methacrylic acid copolymer with a metal ion, an ethylene-methyl methacrylate copolymer ( EMMA), ethylene-acrylic acid copolymer (EAA) and the like are preferably used.

  Examples of the highly glossy pigment with reflection used in the present invention include pearl pigments, polarized pearl pigments, polarized vapor deposition pigments, aluminum flakes and vapor deposited aluminum flakes. The size of the particles is preferably 10 μm or less in the long side direction of the particles.

  Here, a highly glossy pigment with reflection is a pigment whose hue changes depending on the viewing angle, and a polarized vapor deposition pigment is a pigment that has undergone a polarized vapor deposition process. It uses the principle of prism color coding. By forming a dielectric multilayer film, a reflective and transmissive film that can emphasize different colors depending on the viewing angle is formed. For example, a reflection film and a plurality of transparent layers having different light refractive indexes are sequentially formed on the surface of the pigment, and a transparent coating film is provided.

  As described above, according to the method for producing a hologram sheet of the present invention, it is not necessary to provide a hologram light reflecting layer for performing metal deposition such as aluminum, and a hologram is formed by extrusion, It is not only economical and economical, but also pearl pigments and polarized pearls, which have outstanding production efficiency, can easily control the thickness by extrusion technology, and can minimize the thickness of the hologram layer. Reflective light from a hologram underlayer containing a highly glossy pigment with reflection such as pigment, polarized vapor-deposited pigment, aluminum flake, vapor-deposited aluminum flake, etc. can express any interference color through refraction in the hologram layer It is possible to provide a method for manufacturing a hologram sheet, which has a very high hologram decoration effect.

  In addition, by using a metal vapor-deposited film or a polarizing film as the base sheet, a method for producing a hologram sheet that has both the base sheet of the hologram sheet and the base layer of the hologram layer can be provided.

  According to the method for producing a hologram sheet of the present invention, an inexpensive hologram sheet can be obtained which can exhibit any interference color and has a very high hologram decoration effect.

It is a schematic process drawing explaining an example of the manufacturing method of the hologram sheet of this invention. It is a schematic process drawing explaining the other example of the manufacturing method of the hologram sheet of this invention. It is a schematic cross section of the hologram sheet which shows an example of a structure of the hologram sheet manufactured by the manufacturing method of the hologram sheet of this invention. It is a schematic cross section of the hologram sheet which shows the other example of the structure of the hologram sheet manufactured by the manufacturing method of the hologram sheet of this invention.

Explanation of symbols

1, 4, 20, 24 ... Extruder body 2, 2 '... Base sheet 5, 21, 25 ... T-die 6, 6', 26 ... Extruded molten film Extruded coating resin layer 6a ... Extruded coating hologram layer 6b ... Extruded coated hologram underlayer 7, 27 ... Cooling roll 8, 28 ... Embossing stamper 9, 29 ... Nip roll 10, 10 ' 30, 30 '... take-up rolls 11, 31 ... hologram sheet 12, 32 ... take-up roll 22 ... extruded base material sheet 40, 50 ... hologram sheet 41 ... · Hologram layer 41a · · · fine uneven shape 42 · · · hologram base layer 42a · · · high gloss pigment 43 with reflection · · · base sheet 53 · · · base sheet layer

Claims (5)

On the substrate sheet, the molten resin layer extruded from the extruder is extrusion coated, and the molten extruded resin layer is pressed with a roll equipped with an emboss hologram forming stamper, A hologram sheet manufacturing method for forming a hologram on
As the molten extrusion coating resin layer, at least two layers of a transparent resin layer serving as a surface layer of a hologram sheet and a resin layer to which a highly glossy pigment with reflection serving as a hologram base layer is added are extrusion coated. A method for producing a hologram sheet, comprising forming an embossed hologram on the transparent resin layer. A molten resin layer extruded from an extruder is extrusion coated on a substrate sheet made of a vapor-deposited film or a polarizing film, and the molten extrusion coating resin is used in a roll equipped with an emboss hologram forming stamper. A method of manufacturing a hologram sheet by pressing a layer to form a hologram on a surface,
A method for producing a hologram sheet, comprising forming an embossed hologram on the transparent resin layer by extruding at least a transparent resin layer serving as a surface layer of the hologram sheet as the molten extrusion coating resin layer.   2. The method for producing a hologram sheet according to claim 1, wherein the base sheet is a base sheet formed by molding a molten sheet-like resin obtained by extruding a molten resin from an extruder.   The hologram sheet according to claim 1 or 3, wherein the high-gloss pigment with reflection is any one of a pearl pigment, a polarized pearl pigment, a polarized vapor-deposited pigment, aluminum flakes, and vapor-deposited aluminum flakes. Method.   A hologram sheet manufactured by the method for manufacturing a hologram sheet according to claim 1.

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