JPH0368988A - Method for working hologram forming surface - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of processing a surface on which a hologram is formed.

[Conventional technology]

In recent years, holograms have been reproduced using so-called hologram relief, which records interference fringes of light as a concavo-convex pattern on the surface of a recording material. This hologram copy is
Embossing is performed on a resin sheet using a hologram relief master plate on which a hologram relief is formed, and metal vapor deposition is performed on the uneven surface of the resin, that is, the hologram forming surface.

[Problem to be solved by the invention]

However, although the hologram itself has an excellent design, depending on the product, the design may deteriorate if the entire sheet, packaging bag, etc. has a hologram pattern.

The present invention was devised in view of the above circumstances, and an object of the present invention is to provide a method for processing a hologram forming surface that can provide a hologram pattern only in a desired region of the hologram forming surface.

[Means to solve the problem]

In the present invention, an ink layer is provided in a predetermined area of a hologram forming surface, and then a metal reflective layer is provided on the hologram forming surface and the ink layer.

[Effect]

An ink layer is provided on a predetermined region of a hologram forming surface formed on the sheet, and then a metal reflective layer is provided on the hologram forming surface and the ink layer. Therefore, on the hologram forming surface provided with the ink layer,
Regardless of whether the ink is colored or colorless, the recesses of the hologram pattern are filled, so the hologram pattern disappears, and a hologram pattern with metallic luster is formed only in areas where the sheet and ink layer are not provided. I can do it. Therefore, even if the hologram pattern is a simple one such as a diffraction grating, various different patterns can be formed by combining it with printing.

〔Example〕 Hereinafter, the present invention will be described in detail with reference to the drawings.

1 and 2 are schematic cross-sectional views of a hologram forming sheet for explaining one embodiment of the present invention. First, in the hologram forming sheet 1, the ink layer 3 is laminated on the hologram forming surface 2, as shown in FIG. The predetermined area on which the ink layer 3 is to be formed can be determined as appropriate from the viewpoint of design and the like, such as an area in which a hologram pattern is not required within a sheet, a packaging bag, or the like. The ink layer 3 may be, for example, a layer of ordinary gravure printing ink applied by gravure printing, and this ink may be colored or colorless. Also, the thickness of this ink layer is usually 1 to 5
The thickness is preferably about μm.

Next, as shown in FIG. 2, in the hologram forming sheet 1, the hologram forming surface 2 and the ink layer 3 are
A metal reflective layer 4 is provided on top of the metal reflective layer 4 . This metal reflective layer 4
The layer may be formed by depositing a metal such as aluminum, a metal oxide such as zinc oxide, etc. by vacuum evaporation, sputtering, ion blasting, or the like. The thickness of the metal reflective layer 4 is usually preferably about 20 to 80 nm.

By performing gravure printing or the like on the hologram forming surface 2 of the hologram forming sheet 1 in this way and depositing the ink layer 3, the recesses of the hologram pattern that are shallow in depth compared to the ink layer thickness are filled with the ink layer. , and the surface of the ink layer 3 becomes flat regardless of the unevenness of the hologram pattern.

Therefore, the hologram pattern in the part where the ink layer 3 is formed disappears, and the metal reflective layer 4 is further laminated on the hologram forming surface 2 and the ink layer 3 of the hologram forming sheet 1. A hologram pattern with metallic luster is formed only on the portions of the hologram forming surface 2 where the ink layer 3 is not provided.

3 and 4 are schematic cross-sectional views of a hologram forming sheet for explaining another embodiment of the present invention. First, in the hologram forming sheet 5, as shown in FIG. 3, an ink layer 9 is formed in a predetermined area of the hologram forming surface 8 of the resin layer 7 extruded onto the base sheet 6.

Next, as shown in FIG. 4, in the hologram forming sheet 5, the hologram forming surface 8 and the ink layer 9 are
A metal reflective layer 10 is provided on top of the metal reflective layer 10 .

The hologram forming surface 2 that is the object of the present invention is a hologram forming surface formed simultaneously with sheet forming by extrusion molding. FIG. 5 shows an extrusion laminator 20 for explaining the hologram forming surface 2 that is the object of the present invention.
FIG.

In FIG. 5, the extrusion laminator 20 includes a T-die 21 and a T-die 21 for extruding molten resin into a thin film.
It has a cooling roll 23 and a nip roll 24 for pressing and cooling the molten thin film resin 22 extruded from 1, and a wine goo 25 for winding up the molded hologram forming sheet 1.

The T-die 21 is not particularly limited, and a normal T-die for molding synthetic resin sheets can be used. As the resin, polypropylene resin, polyester resin, polyamide resin, polycarbonate resin, ethylene-vinyl alcohol copolymer, etc. can be used. Further, these resins preferably do not contain additives that may be gasified in the metal reflective layer forming step described below.

The thickness of the resin 22 extruded from the T-die 21 into a thin film is preferably about 5 to 100 μm. If the film thickness is less than 5 μm, the sheet strength will be insufficient, and the adhesion to the base sheet, which will be described later, will be insufficient.
If the thickness exceeds 00 μm, there is a problem that the transparency decreases and the distinguishability of the hologram decreases.

As shown in FIG. 6, the cooling roll 23 is provided with a hologram relief original 26 on its peripheral surface. As the hologram relief original plate 26, (1) chemical silver plating is applied to the secondary hologram surface on which relief-like interference fringes are recorded using photoresist as a photosensitive material, and nickel (Ni) is applied on top of the secondary hologram surface on which relief-like interference fringes are recorded
A relief plate (press mask plate) formed by peeling off the Ni metal film after plating;
It is possible to use a relief plate formed by plating and peeling off the Ni metal film, or (3) a relief plate formed by hot pressing a thermoplastic resin sheet or film with the relief plate of (2) above. can. Among these, from the viewpoint of the durability of extrusion-molded relief plates, the above (1),
The Ni relief plate (2) is preferred.

The hologram relief original plate 26 may be placed on the circumferential surface of the cooling roll 23 by any method such as bonding with adhesive, fixing by vacuum suction, or mounting with bolts, and extrusion molding, especially if it is a placement method that prevents it from falling off. There are no restrictions. Further, the number, arrangement pattern, arrangement interval, etc. of the hologram relief original plates 26 arranged on the circumferential surface of the cooling roll 23 can be appropriately determined depending on the intended hologram forming sheet.

By changing the hologram relief original plate 26 disposed on the circumferential surface of the cooling roll 23 to a hologram relief original plate of an appropriate capacity, it is possible to change the hologram pattern, for example, in resin sheets of the same shape, depending on the purpose of use, etc. .

The temperature of the cooling roll 23 can be determined from the thickness of the resin 22 extruded from the T-die 21, the amount of extrusion, etc.
Generally, the temperature is preferably about 15 to 25°C.

The molten resin 22 extruded into a thin film from the T-die 21 of the extrusion laminator 20 described above is pressed and cooled by the cooling roll 23 and the nip roll 24 and formed into the sheet 1. At this time, the surface of the cooling roll 23 The hologram forming surface 2 is integrally formed on the sheet 1 by the hologram relief original plate 26 disposed in the sheet 1 (see FIG. 1).
.

FIG. 7 is a schematic diagram of an extrusion laminator 30 for explaining another example of a hologram forming surface that is a target of the present invention. In FIG. 7, the extrusion laminator 30 is
In addition to the extrusion laminator 20 shown in FIG. 5, the base sheet 6 is supplied from an unwinder 27 between a cooling roll 23 and a nip roll 24. Therefore, the molten resin 22 extruded into a thin film from the T-die 21 of the laminator 30 is laminated with the base sheet 6, and is pressed and cooled by the cooling roll 23 and nip roll 24 to form the sheet 5. At this time, a hologram forming surface is integrally formed on the resin layer 7 side by the hologram relief original plate disposed on the circumferential surface of the cooling roll 23 (see FIG. 3).

As the base sheet 6, stretched polypropylene film,
Polycarbonate film, polyester film, cellophane film, etc. can be used. The thickness of the base sheet 6 is preferably about 10 to 200 μm. Further, if necessary, an anchor agent, an adhesive such as acid-modified polyolefin, or the like may be applied to the side of the base sheet 6 that is to be laminated with the molten resin 22.

Next, the present invention will be explained in more detail by showing experimental examples.

Experimental Example 1 In an extrusion laminator 20 as shown in FIG. 5, extrusion lamination was performed using the following polypropylene resin under the following extrusion conditions to produce a hologram forming sheet. In this case, the cooling roll was subjected to a peeling treatment on the relief surface of the press mask plate, then again plated with Ni, and a hologram relief plate formed by peeling off the Ni metal film was bonded thereto using an adhesive.

・Polypropylene resin Mitsui Petrochemical Industries LA-221 ・Extrusion conditions Screw L/D=24 Cylinder temperature = 160℃, 180℃.

240'C Adapter temperature = 260°C T-die temperature = 280°C Molding thickness 2100 μm Cooling roll temperature = 23°C By gravure printing urethane gravure ink (Lamic F220 white manufactured by Dainichiseika Chemical Co., Ltd.) on a predetermined area of this hologram forming sheet. After forming an ink layer with a thickness of 1 μm, aluminum was vapor-deposited with a thickness of 50 nm on this ink layer and the hologram formation surface, and a hologram pattern with metallic luster was obtained only in the area where the ink layer was not formed. A hologram-forming sheet was obtained.

Experimental Example 2 In an extrusion laminator 30 as shown in FIG. 7, a hologram forming sheet was manufactured by extrusion lamination using the following polypropylene resin and base sheet under the following extrusion conditions.

In this case, the same hologram relief plate as in Experimental Example 1 was bonded to the cooling roll using an adhesive.

- Polypropylene resin LA-221 manufactured by Mitsui Petrochemical Industries - Base sheet stretched polypropylene film (20 μm) - Extrusion conditions Screw L/D = 24 Cylinder temperature = 160°C, 180°C.

240°C Adapter temperature = 260°C T-die temperature = 280°C Laminate thickness 215 μm Cooling roll temperature = 23°C After providing an ink layer with a layer thickness of 1 μm on a predetermined area of this hologram forming sheet in the same manner as in Experimental Example 1, When aluminum was vapor-deposited to a thickness of 50 nm on the ink layer and the hologram forming surface, a hologram forming sheet was obtained that had a hologram pattern with metallic luster only in the area where the ink layer was not formed.

The effects of the present invention were clear from the above experimental examples.

〔Effect of the invention〕

According to the present invention, it is possible to form a hologram pattern with partial metallic luster on sheets, packaging bags, etc. Therefore, even if the hologram pattern is a simple one such as a diffraction grating, it can be combined with printing. This brings about the effect that various different patterns can be formed.

[Brief explanation of drawings]

1 and 2 are schematic cross-sectional views of a hologram forming sheet for explaining one embodiment of the present invention, and FIGS. 3 and 4 are hologram forming sheets for explaining other embodiments of the present invention. 5 is a schematic diagram of an extrusion laminator for explaining the hologram forming surface that is the object of the present invention, FIG. 6 is an explanatory diagram of the hologram formation of the present invention, and FIG. FIG. 2 is a schematic diagram of an extrusion laminator for explaining another example of a hologram forming surface. 1.5... Hologram forming sheet, 2.8... Hologram forming surface, 3.9... Ink layer, 4.10...
Metal reflective layer, 6... Base sheet, 20.30... Extrusion laminator, 21... T die, 22... Molten resin, 23... Cooling roll, 24... Nip roll,
25...Wine goo, 26...Hologram relief version, 27...Unwine goo

Claims (1)

Claims: 1. A method for processing a hologram forming surface, which comprises providing an ink layer in a predetermined region of the hologram forming surface, and then providing a metal reflective layer on the hologram forming surface and the ink layer. 2. The hologram forming surface is formed by pressing the molten resin extruded into a thin film from a T-die or the molten resin extruded into a thin film from a T-die onto one side of the base sheet by a cooling roll equipped with a hologram relief original on the circumferential surface. - The method for processing a hologram forming surface according to claim 1, wherein the hologram forming surface is formed by cooling.