JP4508851B2 - Hologram laminate and method for forming hologram laminate - Google Patents

Description

  The present invention relates to a hologram laminate having a hologram forming layer on which a hologram pattern is formed, and a method for forming a hologram laminate.

  Since the hologram resin is sensitive to heat, if a laminate including a hologram layer with a hologram pattern formed is simply formed by hot pressing, the hologram resin is destroyed and the reflective layer on the surface of the hologram layer is also destroyed. Will be. As a result, the brightness peculiar to the hologram may be lost, or information on the three-dimensional object may be lost. Also, even if the hologram pattern itself is not destroyed, the embossed paper or other resin that is hot-pressed together is pressed, and macroscopic irregularities are generated on the resin surface forming the hologram pattern. The characteristic brightness and color may be impaired. On the other hand, when forming a laminate with a hologram foil or hologram layer formed of a resin with low heat resistance, the main part of the hologram has unevenness due to the mold, such as a pattern disappearing due to heat or foil defects. There are already known methods for directly forming the film and solving the problem due to the difference in thermal expansion coefficient between the hologram layer and other layers by transferring the hologram layer (for example, Patent Document 1 and Patent Document). 2).

JP 10-312707 JP 2003-9941 A

  However, in the above solution, the manufacturing process has to be greatly changed from the conventional manufacturing process.

  Accordingly, the present invention provides a hologram laminate and a method for forming the same, which can be hot-press molded while maintaining the surface accuracy of the hologram with a solution that has not been found in the past.

  The present invention solves the above-described problems by the following method. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiment.

  The hologram laminate (1) of the present invention is a hologram laminate formed by hot pressing, and includes a heat seal layer (N) formed by bonding two bonded heat seals (AN, BN). A hologram layer (H) including a hologram forming layer (A4) having a hologram pattern formed on one side of the heat seal layer, and a heat-resistant resin having a thickness of 100 μm or more adjacent to the hologram layer. The heat-resistant resin layer (A1) is at least laminated, and at least the printed layer (B2) on which the ink is printed on the other side is laminated on the other side, thereby solving the above problem.

  The hologram laminate of the present invention can be obtained by integrating the laminate on the printing layer side and the laminate on the hologram layer side by hot pressing through a heat seal layer. In this case, by providing a smooth heat-resistant resin layer of 100 μm or more adjacent to the hologram layer, the resin of the hologram formation layer is not destroyed by thermal deformation, and the surface accuracy of the hologram pattern is maintained. It became clear by earnest efforts. In addition, what is necessary is just to determine the thickness of a heat-resistant resin layer according to the use of a hologram laminated body in the range of 100 micrometers or more. For example, if it is an underlay use, it is 0.2 mm-0.5 mm. In addition to the hologram forming layer, the hologram layer includes a reflective layer and, if necessary, an adhesive layer.

  The heat-resistant resin layer may be provided on the heat sealing layer side with respect to the hologram layer or on the opposite side of the heat sealing layer. The reflective layer may be provided in a case where it is provided on the heat sealing layer side with respect to the hologram forming layer and a case where it is provided on the opposite side of the heat sealing layer. The hologram pattern includes an interference fringe pattern that generates a predetermined shape and a so-called diffraction grating pattern that is a certain uneven pattern.

  The heat seal layer preferably has a cushioning property with a thickness of 50 μm or more. Even when paper with a clear embossed area is used as the printing substrate for the printing layer, the unevenness of the embossed area is sufficiently absorbed by the heat-sealing layer. Absent. Therefore, the surface accuracy of the hologram can be further maintained, and the unique brightness of the hologram is not lost. The thickness of the heat seal layer is not particularly limited in the range of 50 μm or more, but it is sufficient if it has a process margin.

  The method for forming a hologram laminate according to the present invention includes a hologram layer (H) including a hologram forming layer (A4) having a hologram pattern formed on one side of a heat seal layer (AN) that generates adhesiveness upon heating, A heat-resistant resin layer (A1) composed of a heat-resistant resin having a thickness of 100 μm or more adjacent to the hologram layer, and a heat-seal layer (BN) that produces adhesiveness by heating, and a first sheet (A) laminated at least ) And the second sheet (B) on which at least the printing layer (B2) on which the ink is printed on the base material is laminated on each side, the heat sealing layers are overlapped with each other, and The above problems are solved by hot pressing from both sides of the first sheet and the second sheet. The hologram laminate of the present invention described above can be obtained by this hologram laminate formation method.

  As described above, according to the present invention, by providing a heat-resistant resin layer having a thickness of 100 μm or more adjacent to the hologram layer including the hologram forming layer, hot pressing can be performed while maintaining the surface accuracy of the hologram. A hologram laminate or the like can be provided.

  FIG. 1 is a cross-sectional view showing an example of a hologram laminate 1 of the present invention. The hologram laminate 1 in this embodiment is an underlay used for writing. The hologram laminate 1 is obtained by integrating a first sheet A and a second sheet B through a heat sealing layer N by hot pressing. The first sheet A includes an adhesive layer A6, a hologram base layer A5, a hologram forming layer A4 on which a hologram pattern is formed, a reflective layer A3, an adhesive layer A2, on one side of the first sheet-side heat seal layer AN, Further, a shape maintaining layer A1 as a heat resistant resin layer having a thickness of 100 μm or more is laminated. In this embodiment, the adhesive layer A2, the reflective layer A3, and the hologram forming layer A4 constitute the hologram layer H, and the shape maintaining layer A1 is provided adjacent to the hologram layer H.

  The shape maintaining layer A1 of this embodiment has a thickness of 188 μm and is made of polyethylene terephthalate. As the polyethylene terephthalate, biaxially stretched PET having a low heat shrinkage ratio during heating and being difficult to deform is used. The reflective layer A3 may be a transparent vapor-deposited layer that generates a refractive index difference. In the present invention, the reflective layer A3 is a layer in which aluminum is vapor-deposited. The hologram base layer A5 functions as a support layer for the hologram forming layer A4, and is made of polyethylene terephthalate with a thickness of 16 to 25 μm. The 1st sheet | seat side heat seal layer AN should just have a cushioning property, and produces adhesiveness with the heat | fever at the time of a hot-pressure process. In this embodiment, it is made of polyethylene and is provided so that the heat seal layer N after hot pressing is 80 μm. Each of the adhesive layers A2 and A6 may be a conventionally known one.

  In the second sheet B, the adhesive layer B1, the printing layer B2, the printing base material layer B3, the adhesive layer B4, and the surface layer B5 are laminated on one side of the second sheet side heat sealing layer BN. Similar to the first sheet side heat seal layer AN, the second sheet side heat seal layer BN only needs to have a cushioning property and produce adhesiveness by heat during hot pressing. In this embodiment, it is made of polyethylene, and is provided so that the thickness of the heat seal layer N is 80 μm after hot pressing. The printing layer B2 is an ink provided by gravure printing on the printing base material layer B3. The printing base material layer B3 may be a heat resistant resin having a thickness of 10 μm or more. In this embodiment, it is made of polyethylene terephthalate with a thickness of 25 μm. The surface layer B5 is provided to improve the writing property of the hologram laminate 1 as an underlay, and is made of polyethylene terephthalate with a thickness of 188 μm. Each of the adhesive layers B1 and B4 may be a conventionally known one.

  FIGS. 2A to 2C and FIGS. 3A to 3B are views showing the first sheet A forming process. What is necessary is just to perform the operation | work in each process by a conventionally well-known method. First, the hologram resin A4 ′ is applied on the hologram substrate layer A5 (FIG. 2A), and a hologram pattern is formed on the hologram resin A4 ′ (FIG. 2B). Hereinafter, the hologram resin A4 ′ on which the hologram pattern is formed is referred to as a hologram forming layer A4. Next, the reflective layer A3 is formed by vapor-depositing aluminum on the hologram forming layer A4 (FIG. 2C), and the shape maintaining layer A1 is further bonded onto the reflective layer A3 by the adhesive layer A2 (FIG. 3 ( a)). Finally, the first sheet-side heat seal layer AN is bonded to the hologram base layer A5 by the adhesive layer A6 (FIG. 3B). Thus, the first sheet A can be obtained.

  FIGS. 4A to 4C are diagrams illustrating a process of forming the second sheet B. FIG. The work in each process may be performed by a conventionally known method. First, the printing layer B2 is formed by performing gravure printing on the paper as the printing base material laminated on the printing protective layer B3 (FIG. 4A). An embossed surface is formed on the printing layer B2 by printing. Next, the surface layer B5 is bonded to the print protective layer B3 on the side opposite to the print layer B2 by the adhesive layer B4 (FIG. 4B). Finally, the second sheet-side heat seal layer BN is bonded to the print layer B2 with the adhesive layer B1 (FIG. 4C). Thus, the second sheet B can be obtained.

  Next, the first sheet A and the second sheet B are overlapped by the first sheet-side heat sealing layer AN and the second sheet-side heat sealing layer BN, and the first sheet A and the second sheet overlapped with each other. The hot pressing is performed from both outer sides of the laminate composed of the sheet B. The heat seal layers AN and BN are bonded to each other by being heated. As a result, the first sheet A and the second sheet B are integrated, and the hologram laminate 1 composed of the first sheet A and the second sheet B can be obtained. At this time, it is possible to prevent the reflective layer A3 from being destroyed due to the presence of the shape maintaining layer A1, and to avoid imprinting on the hologram pattern due to the embossing of the printed layer B2 due to the presence of the heat seal layers AN and BN. .

  The first sheet-side heat seal layer AN and the second sheet-side heat seal layer BN are bonded to form the heat seal layer N of the hologram laminate 1. Although the heat seal layer N is 80 μm in this embodiment, it may be 50 μm or more. Further, when the pattern of the hologram forming layer A4 of the finally obtained hologram laminate 1 and the pattern of the print layer B2 need to be in a specific positional relationship, the first sheet A and the second sheet B At the time of superposition, the positions of the first sheet A and the second sheet B are confirmed and superposed so that the hologram forming layer A4 and the print layer B2 have the specific positional relationship.

  This invention is not limited to the form mentioned above, You may implement with a various form. For example, the hologram laminate 1 may have an embodiment as shown in FIGS. In the hologram laminate 1a shown in FIG. 5, the reflective layer A3 is provided on the first sheet side heat seal layer AN side with respect to the hologram forming layer A4. In this case, since the shape maintaining layer A1 also functions as the hologram base layer A5, the hologram base layer A5 becomes unnecessary. Hologram formation layer A4 and reflection layer A3 form hologram layer H.

  In the hologram laminate 1b shown in FIG. 6, the shape maintaining layer A1 is provided on the first sheet side heat seal layer AN side with respect to the hologram layer H. In this case, a surface protective layer A8 for protecting the surface of the hologram forming layer A4 is provided on the outermost surface. In the hologram laminate 1c shown in FIG. 7 as well, the shape maintaining layer A1 is provided on the first sheet side heat seal layer AN side with respect to the hologram layer H. In this case, since the reflective layer A3 is the outermost surface, the surface protective layer A8 is unnecessary.

  In the above-described embodiment, the gravure printing is directly printed on a film made of polyethylene terephthalate. However, the second sheet B uses offset printed paper instead of gravure printing as an offset printing paper layer. May be included. The configuration of the laminate 1d in that case is shown in FIG. The second sheet B of the laminate 1d is obtained by laminating an adhesive layer B8 made of polyethylene terephthalate and an offset printing paper layer B7 on the surface layer B5. Since the paper of the offset printing paper layer B7 is bonded to polyethylene terephthalate by heat pressure, if the thickness of the first sheet-side sealing layer AN ′ is 50 μm or more, it is not necessary to provide the second sheet-side sealing layer BN. In addition, in FIG. 8, although the structure similar to the 1st sheet | seat A of the laminated body 1 was shown as the 1st sheet A, the layer structure of the 1st sheet | seat A of the laminated body 1d is any of the laminated body 1, 1a-1c mentioned above. It may be a layer structure.

  An adhesive layer and a protective layer may be appropriately added to each hologram laminate 1, 1a to 1d. In addition, materials other than those described above may be added as appropriate for the constituent materials of each layer. In addition, although the thickness of each layer shown in each FIG. 1-8 was shown with the almost same thickness, in fact, it provides suitably in different thickness.

Sectional drawing which shows an example of the hologram laminated body of this invention. (A), (b) and (c) are figures which show the formation process of the 1st sheet. (A) And (b) is a figure which shows the formation process of the 1st sheet | seat following FIG.2 (c). The figure which shows the formation process of a 2nd sheet | seat. The figure which shows the hologram laminated body of the aspect different from the form shown in FIG. The figure which shows the hologram laminated body of the aspect different from the form shown in FIG. The figure which shows the hologram laminated body of the aspect different from the form shown in FIG. The figure which shows the hologram laminated body of the aspect different from the form shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hologram laminated body A 1st sheet B 2nd sheet A1 Shape maintenance layer A3 Reflective layer A4 Hologram formation layer H Hologram layer N Heat sealing layer AN, AN '1st sheet side heat sealing layer BN 2nd sheet side heat sealing Layer B2 Print layer

Claims (3)

  Hologram laminate formed by hot pressing, a hologram having a hologram pattern formed on one side of the heat seal layer sandwiched between two heat seal layers bonded to each other A hologram layer including a formation layer and a heat-resistant resin layer made of a heat-resistant resin having a thickness of 100 μm or more adjacent to the hologram layer are stacked at least, and ink is printed on the substrate on the other side. A hologram laminate, wherein at least printing layers are laminated.   The hologram laminate according to claim 1, wherein the heat seal layer has a cushioning property with a thickness of 50 μm or more. A heat-resistant resin comprising a hologram layer including a hologram-forming layer on which a hologram pattern is formed on one side of a heat-sealing layer that generates adhesiveness upon heating, and a heat-resistant resin having a thickness of 100 μm or more adjacent to the hologram layer A first sheet on which at least a layer is laminated, and a second sheet on which at least a printing layer in which ink is printed on a base material is laminated on one side of a heat-sealing layer that generates adhesiveness by heating, The hologram laminate is formed by stacking the heat seal layers on each other and hot pressing from both sides of the superimposed first sheet and second sheet.

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