具体实施方式：
[0018]“Three-dimensional shape” in the present disclosure has a meaning of forming a stereoscopic shape. That is, has a meaning of having a difference of height with reference to a base material and the difference of height is at least 7 μm. In the “three-dimensional shape”, the printed portion having concavities and convexities on the entire surface of the base material may be provided and the difference of height is formed and the printed portion may be provided on a part of the base material and the difference of height may be formed between a region that has the printed portion and a region that does not have the printed portion.
[0019]“Followed” has the meaning of a height of the over-laminate film from the base material being changed according to change in height of the printed portions from the base material. That is, for example, when the printed portions have peaks and troughs, “followed” has the meaning of having peaks of the over-laminate film at positions of the peaks of the printed portions, and having troughs of the over-laminate film at positions of the troughs of the printed portions. Furthermore, concerning evaluation of whether or not the over-laminate film has the three-dimensional shape following the three-dimensional shape of the printed portion, evaluation of “has the three-dimensional shape following” is possible, for example, in a case where it is possible to recognize the three-dimensional shape of the printed portion through the over-laminate film or a case where the three-dimensional shape of the over-laminate film is recognized as substantially the same shape as the three-dimensional shape of the printed portion or a shape that is similar thereto. Evaluation of “has the three-dimensional shape following” is possible, for example, in a case where the number of peaks that are recognized as the three-dimensional shape of the over-laminate film with respect to the number of peaks that are recognized as the three-dimensional shape of the printed portion.
[0020]“Transparent” has a meaning of average transmittance of light in a visible range of approximately 60% or greater, preferably approximately 80% or greater, and more preferably approximately 90% or greater, and is not limited to being colorless and transparent, semitransparent is also included. “Colored” has a meaning of achromatic color or chromatic color. In addition, not limited to a single color, a form having a pattern formed of a plurality of colors is also included, and furthermore, semitransparent is also included.
[0021]“Printed portion” is a part including a single printed layer or a plurality of printed layers, single “printed layer” is a layer formed by the same ultraviolet light curing ink, and in a case where the plurality of layers formed from the same type of ultraviolet light curing ink with different pigments are present, the printed layers are different from each other. That is, in a case where, for example, the printed layer is formed by an inkjet printer, the printed layer formed by landing ultraviolet light curing ink of the same color a plurality of times at the same position is a single layer.
[0022]“Planar pattern” has a meaning of a shape and size of the printed layer in planar view of the printed layer. “Substantially the same planar pattern” is a case of having the same shape and size of the printed layer, or even if different, as long as it is not possible to recognize a difference with the naked eye, substantially the same pattern is presumed. “Different planar pattern” has a meaning of the shape and size of the printed layer being different and is outside of “substantially the same planar pattern”.
[0023]Decorative Sheet
[0024]A decorative sheet according to an aspect of the present disclosure is provided with a base material, a three-dimensional shape printed portion provided on the base material and including ultraviolet light curing ink, and an over-laminate film laminated on the base material and the printed portion. The over-laminate film has a film layer on the surface side and an adhesive layer on the rear side, and has a three-dimensional shape following the three-dimensional shape of the printed portion by laminating on the printed portion via the adhesive layer. The printed portion includes, for example, a printed layer formed by inkjet printing.
[0025]Since the decorative sheet according to the aspect is provided with the over-laminate film having the three-dimensional shape following the three-dimensional shape of the printed portion, it is possible to provide decoration with the stereoscopic effect in comparison to the decorative sheet with a two-dimensional shape with the surface flattened. Since the over-laminate film is a film with an adhesive, it is possible to easily cover the printed portion, and it is possible to protect the printed portion and improve durability and weather resistance.
[0026]In the decorative sheet according to the aspect, a thickness of at least one part of a printed portion may be approximately 7 μm or greater. In the decorative sheet according to the aspect, a thickness of at least one part of a printed portion may be approximately 15 μm or greater. In the decorative sheet according to the aspect, a thickness of at least one part of a printed portion may be approximately 20 μm or greater. It is possible to carry out decoration with the stereoscopic effect by setting the thickness of such printed portions to a fixed amount or greater.
[0027]As will be described later, the film layer of the over-laminate film is able to be set as a thermoplastic resin film with the thickness of a fixed amount or less provided with pliability following the three-dimensional shape of the printed portion when the printed portion is covered. A specific example of a thermoplastic film will be described later.
[0028]In the decorative sheet according to the aspect, it is preferable that the thickness of the film layer of the over-laminate film is approximately 90 μm or less. Followability is easily obtained in the three-dimensional shape of the printed portion by adjusting the thickness of such a film layer. In the decorative sheet according to the aspect, the thickness of the film layer of the over-laminate film may be approximately 60 μm or less or 50 μm or less. In the decorative sheet according to the aspect, since the film layer functions as the protective layer, it is preferable that the thickness of the film layer is approximately 5 μm or greater, and may be approximately 10 μm or greater.
[0029]In the decorative sheet according to the aspect, when the surface roughness of the over-laminate film before being laminated on the base material and the printed portion is set as Ra (0) and the surface roughness of the over-laminate film laminated on the base material and the printed portion is set as Ra, it is preferable that a surface roughness change ratio Ra (ratio) of the over-laminate film represented by Formula (1) is set to approximately 110% or greater.
Ra(ratio)(%)=(Ra−Ra(0))/Ra(0)×100. Formula 1:
A numeric value of the change ratio Ra is one index indicating the degree of following by the over-laminate film on the concavities and convexities of the printed portion and the greater the numeric value, the greater the decoration with the stereoscopic effect is obtained.
[0030]In the decorative sheet according to the aspect, the surface roughness Rz of the over-laminate film may be approximately 10 μm or greater. In the decorative sheet according to the aspect, the surface roughness Rz of an overlay film may be approximately 15 μm or greater. In the decorative sheet according to the aspect, the surface roughness Rz of the over-laminate film may be approximately 20 μm or greater. The surface roughness Rz of the over-laminate film is one index indicating the degree of following by the over-laminate film on the concavities and convexities of the printed portion and the greater the numeric value, the greater the decoration with the stereoscopic effect is obtained.
[0031]In the decorative sheet according to the aspect, the film layer of the over-laminate film may be transparent. In the decorative sheet according to the aspect, the film layer of the over-laminate film may be colored.
[0032]In the decorative sheet according to the aspect, it is desirable that the peak temperature of a coefficient of loss (tan δ) of the adhesive layer of the over-laminate film is −20° C. or higher. In this case, since shape maintenance of the adhesive layer is great, after covering it is also possible to maintain the three-dimensional shape of the over-laminate film covering to follow the three-dimensional shape of the printed portion. As a result, it is possible to more stably maintain the sterical decoration of the decorative sheet surface. In the decorative sheet according to the aspect, the peak temperature of the tan δ of the adhesive layer may be approximately −15° C. or higher or approximately −10° C. or higher. In the decorative sheet according to the aspect, it is desirable that the peak temperature of the tan δ of the adhesive layer is approximately 5° C. or lower. In this condition, it is possible to exhibit adhesiveness with good efficiency at room temperature. In the decorative sheet according to the aspect, the peak temperature of the tan δ of the adhesive layer may be approximately 0° C. or lower.
[0033]In the decorative sheet according to the aspect, the printed portion may have a plurality of printed layers. In the decorative sheet according to the aspect, the plurality of printed layers may include a first printed layer and a second printed layer that has substantially the same planar pattern as the first printed layer and is disposed on the first printed layer. It is possible to provide a more sterical decoration.
[0034]In the decorative sheet according to the aspect, the plurality of printed layers may include at least a color layer with low transparency and a stereoscopic form layer with higher transparency than the transparency of the color layer.
[0035]In the decorative sheet according to the aspect, the plurality of printed layers may include a first printed layer and a second printed layer that has a different planar pattern from the first printed layer and is disposed on the first printed layer. It is possible to provide a more complex and colorful decoration.
[0036]In the decorative sheet according to the aspect, there may further be a surface-protecting layer on the outermost surface of the over-laminate film.
[0037]A production method of the decorative sheet according to the aspect of the present disclosure, the method comprising the steps of carrying out ultraviolet light curing inkjet printing on a base material and forming a three-dimensional shape printed portion, and laminating an over-laminate film on the base material and the printed portion so that the adhesive layer of the over-laminate film faces the base material and printed portion side. Thereby, the over-laminate film is formed in a three-dimensional shape following the three-dimensional shape of the printed portion.
[0038]In the production method of the decorative sheet according to the aspect, during lamination, the over-laminate film may be heated to room temperature or higher. In a case where the over-laminate film is a thermoplastic film, it is possible to further increase followability with respect to the three-dimensional shape of the printed portion. The heat temperature may be approximately 35° C. or higher or approximately 50° C. or higher. Meanwhile, the heat temperature may be approximately 85° C. or lower such that the three-dimensional shape of the printed layer is maintained.
[0039]Hereinafter, the base material, the printed portion, the over-laminate film, and the surface-protecting layer of the decorative sheet according to the present disclosure will be described in further detail.
[0040]<Substrate>
[0041]For example, the base material is provided with a graphic film, the adhesive layer, and a release liner. The graphic film is provided on the adhesive layer, and the adhesive layer is provided on the release liner.
[0042]For example, the graphic film includes polyurethane, acrylic resin, polyester, polyolefin, vinyl chloride resin, vinyl chloride-vinyl acetate resin, polycarbonate, polyimide, polyamide, and polyester-amide. For example, a graphic film 11 may include vinyl chloride resin, vinyl chloride-vinyl acetate resin, acrylic resin, and a combination thereof, and may be a laminated body of a plurality of materials. Since the graphic film including the materials is superior in reception of ink, the high quality printed portion is formed on the graphic film.
[0043]For example, the adhesive layer includes a thermoplastic material, and specifically, includes a material such as acrylic adhesive, polyester adhesive, rubber adhesive, silicone adhesive, or polyurethane adhesive.
[0044]The release liner may be a liner often used in fields of adhesive tapes and the like, and is not limited to the specific members. Preferred release liners include paper, plastic materials such as polyethylene, polypropylene, polyesters or cellulose acetate, paper or another material that is covered or laminated with this type of plastic material. The release liner may be used without further modification, but can be used after being subjected to silicone treatment or treated using another method in order to improve the release properties thereof.
[0045]It is possible to use various commercially available products as the base material and it is possible to use a commercially available film such as a graphic film appropriate for formation of a printed image. Scotchcal™ graphic film IJ180-10, Scotchcal™ graphic film IJ5331, and Scotchcal™ graphic film IJ8150 (the above manufactured by 3M) are given as examples of commercially available graphic films. The Scotchcal™ graphic films are provided with the graphic film, the adhesive layer, and the release liner. The thickness of the combined graphic film and adhesive layer may be set as, for example, approximately 80 μm to approximately 90 μm. The thickness of the release liner may be set as, for example, approximately 10 μm to approximately 500 μm.
[0046]<Printed Portion>
[0047]The printed portion includes ultraviolet light curing ink and is formed by ultraviolet light curing inkjet printing. Ultraviolet light curing inkjet printing is able to easily print the printed image on the base material even in a small lot unit on the basis of the printed image data corresponding to various images and it is possible to obtain a full color printed image having outdoor weather resistance. The ultraviolet light curing ink used in ultraviolet light curing inkjet printing is provided with, for example, a photopolymerizable resin, a photopolymerization initiator, a coloring agent, and an adjuvant. Full color printing is possible by the ultraviolet light curing ink generally being provided as four colors of ink sets of cyan (C) ink, magenta (M) ink, yellow (Y) ink, and black (K) ink. As examples, ultraviolet light curing ink LUS-200 (manufactured by 3M) and UJV500-160 UV inkjet printer pure ink (manufactured by Mimaki Engineering Co., Ltd.) are given as the ultraviolet light curing ink. It is also possible to use transparent ink as the ultraviolet light curing ink. For example, it is possible to use UV curing ink for an inkjet printer manufactured by Fujifilm Corporation (product name: UV-IJINK LL391 CLEAR 600 ml) as such an ink.
[0048]A region in which the printed portion is formed on the base material is a printed region. In a case where inkjet printing is performed, it is possible to set a maximum thickness of the printed portion to approximately 7 μm in printing of one time, that is, landing ink one time. In a case where overlapping printing is performed, it is possible to form a part in which the thickness in the printed portion exceeds approximately 7 μm.
[0049]The printed portion has a three-dimensional shape, and in particular, has a thickness in a height direction with reference to the base material. For example, in a case where the printed region and a peripheral region outside of the printing region are formed on the base material, the printed region has difference of height with respect to the peripheral region and forms a sterical three-dimensional shape. If peaks and troughs are formed on the surface of the printed portion, the printed portion itself has difference of height and forms the sterical three-dimensional shape.
[0050]The printed portion may include a plurality of printed layers. For example, the printed portions may include the first printed layer and the second printed layer having substantially the same planar pattern as the first printed layer and disposed on the first printed layer. The printed portions may include the first printed layer and the second printed layer having a planar pattern different from the first printed layer and disposed on the first printed layer. The plurality of printed layers are not limited to a case including two layers, that is, the first printed layer and the second printed layer, and may be provided with three layers or more.
[0051]The plurality of printed layers may include at least a color layer with low transparency and a stereoscopic form layer with higher transparency than the transparency of the color layer. For example, the first printed layer may be the color layer and the second printed layer may be the stereoscopic form layer. In the case of three layers or more, two stereoscopic form layers may be provided to interpose the color layer.
[0052]<Over-Laminate Film>
[0053]The over-laminate film is provided with the film layer and an adhesive layer, and is laminated on the printed portion via the adhesive layer. When the over-laminate film is bonded to the printed layer, the film layer indicates good efficiency of followability with respect to the three-dimensional shape of the printed layer, and is able to maintain a flow state of the over-laminate film with good efficiency due to adhesiveness of the adhesive layer after bonding.
[0054]The film layer is able to be a film in which the thermoplastic resin is a base following the three-dimensional shape of the printed portion when heated at a temperature of room temperature or higher. The film layer is able to be a film in which the thermoplastic resin is the base following the three-dimensional shape of the printed portion when heated at a temperature of approximately 35° C. or higher and approximately 80° C. or lower. For example, it is possible to use the film layer in which thermoplastic resin such as polyvinyl chloride, polyacrylic resin, polyfluorine resin, polyurethane resin, or ABS resin is the base.
[0055]The thickness of the film layer is preferably approximately 90 μm or less, and may be 60 μm or less or approximately 50 μm or less such that followability with respect to the three-dimensional shape of the printed portion is not interfered with. Since the thickness of the film layer functions as the protective layer, it is preferable that the thickness of the film layer is approximately 5 μm or greater and may be approximately 10 μm or greater.
[0056]In an embodiment, a glass transition temperature of the resin included in the film layer is approximately 90° C. or lower, approximately 85° C. or lower, or approximately 80° C. or lower. Due to the glass transition temperature of the resin being approximately 90° C. or lower, it is possible to further improve the surface followability of a decorative adhesive film. Meanwhile, the glass transition temperature of the film layer is desirably approximately 30° C. or higher, approximately 35° C. or higher, or approximately 40° C. or higher. Due to the glass transition temperature of the film layer being approximately 30° C. or higher, it is possible to reduce tackiness of the film layer, more effectively prevent adherence of dust, and increase blocking resistance.
[0057]In a case where the film layer is a polyvinyl chloride resin, the film layer may include only polyvinyl chloride as a polymer component, and may include additional polymers such as thermoplastic polyurethane, acrylonitrile-butadiene rubber (NBR), acrylonitrile-butadiene-styrene (ABS) copolymers, ethylene-vinyl acetate (EVA) copolymers, and acrylic resin in an amount such as approximately 40 mass % or less, approximately 30 mass % or less, or approximately 20 mass % or less with a purpose in which a characteristic such as impact resistance is modified. The polyvinyl chloride resin may include another additive such as a plasticizer such as phthalic acid ester, adipic acid ester, and trimellitic acid ester, an antioxidant, an ultraviolet absorber, a thermal stabilizer, and a pigment. In an embodiment, the film layer includes polyvinyl chloride resin and plasticizers, and the amount of plasticizer is approximately 20 parts by mass or greater or approximately 25 parts by mass or greater, and approximately 40 parts by mass or less or approximately 35 parts by mass or less with respect to 100 parts by mass of polyvinyl chloride resin. In this case, the film layer is able to indicate good efficiency of followability with respect to the three-dimensional printed layer.
[0058]In a case where the film layer is polyurethane resin, the film layer is able to include a resin obtained by polymerizing polyol and a crosslinking agent. As the polyol, it is possible to use, for example, acrylic polyols, polyurethane polyols, polyester polyols such as polycaprolactonediol, polycarbonate polyols, polyether polyols such as polyethylene glycol and polypropylene glycol, and the like. In an embodiment, the film layer includes polyurethane resin that has units derived from polyols of at least one selected from polyurethane polyols, polyester polyols, and polycarbonate polyols. As the crosslinking agent, it is possible to use aliphatic polyisocyanates such as hexamethylene diisocyanate, alicyclic polyisocyanates such as isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, methylene bis (4-phenylisocyanate), burettes, isocyanurates, or adducts thereof, polycarbodiimide, and the like. In an embodiment, the polyurethane resin has units derived from a non-yellowing polyisocyanate. Examples of the non-yellowing polyisocyanate include hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, and the like. According to the embodiment, it is possible to obtain the decorative adhesive film particularly superior in weather resistance. For superior durability and weather resistance, it is possible to advantageously use acrylic urethane resin that is a polymerization adduct of acrylic polyol and the crosslinking agent.
[0059]In a case where the film layer includes acrylic resin, it is possible for the film layer to include a polymer blend of carboxyl group-containing (meth)acrylic polymer and amino group-containing (meth)acrylic polymer. The acrylic resin film including such a polymer blend has high tensile strength and superior elongation properties, and therefore it is possible to provide the decorative film having favorable followability with respect to the surface having the three-dimensional shape. As necessary, it is also possible to form the polymer blend by mixing carboxyl group-containing (meth)acrylic polymer of one type or two or more types and an amino group-containing (meth)acrylic polymer of one type or two or more types. In a case where the film layer includes acrylic resin, the film layer has superior weather resistance and the like and is particularly appropriate in application exposed to a harsh external environment.
[0060]In a case where the film layer includes fluororesin, the film layer is able to include a polymer obtained by polymerizing a fluorine monomer. The fluorine monomer is, for example, a fluorine ethylene monomer such as vinylidene fluoride, hexafluoropropylene, tetrafluoroethylene, and trifluoride ethylene chloride. In addition to the fluorine monomer, one type or two or more types of copolymerizable monomers may be mixed such as methacrylate such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, and acrylate such as butyl methacrylate, methyl acrylate, ethyl acrylate, propyl acrylate, and butyl acrylate. A fluororesin composition may be used in which fluororesin and acrylic resin are blended. For example, in the acrylic polyol resin, the hydroxyl group of the polyol and the hydroxyl group within the (meth)acrylic polymer each react with an isocyanate crosslinking agent, and thereby, the acrylic polyol resin is formed due to urethane bonding. In a case where the film layer includes fluororesin, the film layer has superior chemical resistance, weather resistance, and the like and it is particularly appropriate in application exposed to a harsh external environment.
[0061]In an embodiment, it is also possible to use a film layer including a polymer formulation including thermoplastic polyurethane and cellulosic ester described in WO/2013/019699 (title: “Graphic Article”, Inventor: Steelman et al.) and WO/2013/019706 (title: “Graphic Article”, Inventor: Steelman et al.) or a film layer including a polymer formulation including thermoplastic polyurethane and polyvinyl butyral described in WO/2014/123766 (title: “Graphic Article”, Inventor: Steelman et al.).
[0062]In an embodiment, the film may have a multilayer film structure. In the multilayer film structure, each film layer may be a different material, may be a different additive using the same material, or may be a compounded ratio using the same material. For example, it is possible to form the multilayer film structure using the first film layer formed from one material of the thermoplastic resin described above and the second film layer formed from a thermoplastic resin other than the first film layer. Alternatively, the multilayer film structure may include a pigment in one film layer. Specifically, the film may include a transparent layer on a white layer, or may include the white layer on another pigment color.
[0063]The film layer can be transparent, and can be colored. A case where the adhesive layer is transparent and the film layer is transparent has the meaning of a substantially transparent over-laminate film. A case where the film layer is colored has the meaning of the colored over-laminate film. For example, if the over-laminate film is transparent (including semitransparent), characters or diagrams configured by the printed portion are visually recognized through the over-laminate film.
[0064]It is possible to use a film formed by various forming methods such as an extruded film, an extruded stretched film, a calendar film, and a cast film or a laminate thereof as the film layer. In an embodiment, the film layer is able to be a cast film. According to a cast method, it is easy to obtain a thin film layer and residual internal stress is relatively low, and therefore surface followability of the decorative adhesive film can be advantageously increased. Other than various coating methods using a solvent of a bar coating and a knife coating, a film produced using a hot melt coating method not using the solvent is included on the cast film.
[0065]According to the application of the decorative adhesive film, it is also possible to add a conventionally known additive such as an antioxidant, a UV absorbing agent, a light stabilizer, a plasticizer, a lubricant, an antistatic agent, a flame retardant, and a filler to the film layer.
[0066]For example, the adhesive layer includes a thermoplastic material, and specifically, for example, includes acrylic adhesive, polyester adhesive, rubber adhesive, silicone adhesive, or polyurethane adhesive.
[0067]In the adhesive layer, the peak temperature of the coefficient of loss (tan δ) due to a dynamic viscoelasticity measurement method is preferably approximately −20° C. or higher and more preferably approximately −10° C. or higher. When the peak temperature is low, after the adhesive layer is heat deformed, it is considered that sufficient followability to easily return to the original shape is not obtained. The thickness of the adhesive layer may be, for example, approximately 5 μm to approximately 50 μm. For example, white pigment or black pigment may be added to the adhesive layer.
[0068]The adhesive forming the adhesive layer may contain, for example, a tacky adhesive polymer or the crosslinking agent. An added quantity of the crosslinking agent is able to be appropriately adjusted according to the type of tacky adhesive polymer or the crosslinking agent, but for example, may be 0.02 to 2 parts by mass and may be 0.003 to 1 part by mass with respect to 100 parts by mass of the tacky adhesive polymer. As the crosslinking agent, it is possible to use, for example, an isocyanate compound, a melamine compound, a poly(meth)acrylate compound, an epoxy compound, an amide compound, and a bisamide compound. Furthermore, it is possible to add a monomer composition as the adhesive. The adhesive may further contain an additive such as a tackifier and the UV absorbing agent.
[0069]The coefficient of loss tan δ (=shear loss elastic modulus G″/shear storage elastic modulus G′) of the adhesive layer is measured using an ARES dynamic viscoelasticity measuring device (manufactured by T.A. Instruments Japan, Shinagawa-ku, Tokyo, Japan). Measurement conditions include drying thickness of the adhesive of 1 to 3 mm, a diameter of the adhesive of approximately 7.9 mm, raised temperature range of −60° C. to 100° C., rate of temperature rise 5.0° C./second, and a shear mode of frequency of 1.0 Hz, and under these conditions, the shear storage elastic modulus G′ and the shear loss elastic modulus G″ are measured. The peak temperature of the coefficient of loss tan δ is preferably approximately −20° C. to approximately 5° C., and more preferably approximately −18° C. to approximately 0° C.
[0070]In a case where the peak temperature of the coefficient of loss tan δ is approximately −20° C. or higher, since shape maintenance of the adhesive layer is high, after covering, it is also possible to maintain the three-dimensional shape of the over-laminate film covering to follow the three-dimensional shape of the printed portion. As a result, it is possible to more stably maintain the sterical decoration of the decorative sheet surface.
[0071]In an embodiment, the thickness of the adhesive layer may be approximately 0.5 times or approximately 2 times the thickness of the film layer. The thickness of the adhesive layer may be approximately 5 μm or greater, 10 μm or greater, or 20 μm or greater. Meanwhile, the thickness of adhesive layer may be 80 μm or less, 50 μm or less, or 40 μm or less. In an embodiment, it is possible for the thickness of the adhesive layer to be approximately 0.5 times or greater or approximately 1 time or greater of the thickness of the film layer. The higher a ratio of thickness of the adhesive layer with respect to the film layer, the greater the influence of physical properties of the over-laminate film, for example, physical properties of the adhesive layer such as tensile strength and extension percentage, and as a result, the more it is possible to increase surface followability of the over-laminate film. The thicker the adhesive layer, the greater the effect of alleviation of stress on the film layer occurring when boding to an adherend having an uneven surface. It is possible to give followability with respect to the three-dimensional shape of the printed portion by setting the over-laminate film bonded to a relatively thick adhesive layer with regard to such a film layer. In an embodiment, the thickness of the adhesive layer may be approximately 0.5 times to approximately 2 times the thickness of the film layer.
[0072]It is preferable that the over-laminate film has pliability in order to exhibit favorable followability of the over-laminate film with respect to the three-dimensional shape of the printed portion. It is also possible to express pliability of the over-laminate film by tensile strength or the extension percentage during film rupture.
[0073]In an embodiment, tensile strength during 5% extension of the over-laminate film may be approximately 14 MPa or less, approximately 12 MPa or less, or approximately 11 MPa or less when measured