JP2696814B2 - Method of manufacturing hologram forming sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application fields> In the publishing and printing industries, as books and magazine covers and illustrations, or as gifts and novelties. A hologram is used for the purpose of an effect and an unexpected effect by a three-dimensional effect. The present invention relates to the hologram, and more particularly, to a method for producing a hologram-forming sheet obtained by extruding a surface relief type ologram by an extrusion molding technique. <Prior Art> Conventionally, there are roughly two methods for copying a hologram. The first method is a contact exposure method and an interference method. Each of these methods is a method of newly forming a hologram using a photosensitive material. In other words, expensive photosensitive materials are always required, and the cost accounts for a large proportion of the price of the hologram. Therefore, the duplicated hologram must be expensive, and the time required for production and the processing time of the photosensitive material are relatively high. It is long and the productivity is poor. The second method is to emboss a smooth plastic material to produce a surface relief hologram.
This method is a method of producing a hologram by a mechanical pressing method, so that it can be inexpensively cost-effective, and can be said to be a method relatively suitable for mass production. Plastic sheet of material used in this method,
Conventionally, a thermoplastic plastic sheet such as a rigid polyvinyl chloride sheet has been used. However, this method is a method of heating and embossing the plastic material once molded again.In addition to wasteful energy, if the smoothness of the substrate surface is poor, 700 to 1,500 holograms / hologram There is a demand for the development of a more economical and more reproducible hologram forming technique, for example, it is difficult to emboss a fine irregular pattern of about mm with good reproducibility and uniformity. <Means for Solving the Problem> The present invention has been obtained as a result of a study in view of the above circumstances. That is, the present invention presses and cools the synthetic resin melt extruded from the T-die onto a cooling roll having a relief hologram type stamper on the surface under the concept of simultaneously performing sheet molding and hologram formation. By producing a synthetic resin sheet having a hologram on the surface and further providing a metal reflection layer on the hologram-forming surface, a high-quality hologram-forming sheet, which cannot be obtained conventionally, can be obtained. And a method for manufacturing a hologram-forming sheet with high efficiency. Hereinafter, the present invention will be described in detail. FIG. 1 illustrates a conventional synthetic resin sheet production line for easy understanding of the present invention. That is, (1) shows a pressing machine body, (2) shows a T-die, (3) shows a cooling roll, (4) shows a nip roll,
(5) indicates an extruded synthetic resin (6), a second cooling roll, (7) a take-up roll, and (8) a take-up roll. That is, the molten synthetic resin (5) extruded from the T-die (2) of the extruder is cooled by the cooling roll (3).
And it is pulled off by a nip roll (4), cooled at the same time, formed into a sheet shape, and finally wound up by a winding roll (8). Therefore, the surface smoothness of the completed synthetic resin sheet is determined by the surface smoothness of the cooling roll (3) and the nip roll (4). Similarly, the thickness of the synthetic resin sheet is determined by the discharge amount of the resin, the take-up speed, and the gap between the cooling roll (3) and the nip roll (4). The present invention focuses on such a synthetic resin sheet manufacturing method,
By attaching a relief hologram type stamper to the surface of the cooling roll (3), a method of forming a hologram on the surface of the synthetic resin sheet simultaneously with forming the synthetic resin sheet was discovered. FIG. 2 is an enlarged view of the state for easy understanding. That is, a relief hologram type stamper (9) is mounted on the surface of the cooling roll (3), and the synthetic resin (5) in a molten state extruded from the T-die (2) is a nip roll (4).
The hologram is pressed by the stamper (9), and the hologram is embossed on the surface of the synthetic resin (5). At the same time, since the synthetic resin (5) is cooled by the cooling roll (3), a synthetic resin sheet (5) ′ having a hologram on the surface as shown in FIG. 3 can be finally obtained. FIG. 4 shows that a hologram-forming sheet according to the present invention is obtained by further providing a metal reflection layer (10) on the hologram-forming surface of the synthetic resin sheet (5) 'having the hologram. In the present invention, the following is also possible. That is, the fifth
As shown in the figure, a synthetic roll (5) extruded from a T-die (2) on one side of a base sheet (11) is provided with a cooling roll (3) and a nip roll (3) having a relief hologram type stamper (9) on the surface. By extruding and laminating using 4), a laminated sheet having a hologram on the surface can be obtained. Similarly, a hologram-forming sheet as shown in FIG. 6 is obtained by providing a metal reflection layer on the hologram-forming surface. As described above, the present invention focuses on the features of the synthetic resin sheet manufacturing method, and utilizes the properties thereof, extremely efficiently, in a short time, with good reproducibility, at low cost, and with excellent surface physical properties. And a method for producing the same, which is highly practical. As the synthetic resin that can be used in the present invention, it is possible to use any resin that can be extruded, but it is particularly excellent in transparency and polyester resin, polycarbonate, polystyrene resin, polymethylpentene resin, which can obtain appropriate rigidity, Use of polypropylene resin, polyamide resin or the like is possible. Among them, polyester resin has surface properties,
It can be cited as a representative one in terms of transparency, versatility and the like. As a method of attaching a release hologram type stamper to the cooling roll described in the present invention, a method of fixing with a heat-resistant adhesive, a method of physically fixing with a screw, and the like,
Either method is possible. As a method of providing the metal reflection layer (10) described in the present invention, a metal having a high surface reflectance, for example, aluminum,
It can be obtained by providing a metal such as gold, silver, tin or the like with a thin film of about 100 to 10,000 mm by a method such as vacuum evaporation, sputtering, or ion plating. Substrate sheet described in the present invention (11) A sheet made of a resin such as polyester resin, polycarbonate resin, cellophane or the like, which is easy to handle and relatively inexpensive, can be used. However, in terms of surface smoothness, transparency, surface resistance, and versatility. A polyester resin having a thickness of 10 μm to 200 μm is most suitable. When the synthetic resin melt is extruded and laminated on the base sheet, an anchor agent for improving the adhesiveness may be used on the laminate layer side of the base sheet as needed. <Examples> (Example 1) A) A polyester resin is extruded from a T-die (2) with a thickness of 200 µm under the following processing conditions.
With the relief hologram type stamper (9) and nip roll (4) set above, a polyester sheet having an ologram on the surface was obtained. Resin used: NOVAPET 1065 (manufactured by Mitsubishi Kasei) Temperature setting; (a) Screw temperature 280 ° C (b) Adapter temperature 280 ° C (c) Die lip temperature 280 ° C Cooling roll temperature; 18 ° C Nip roll material; Carbon roll extruder; φ = 60m / m L / D = 26 B) Next, an aluminum vapor-deposited layer was formed on the hologram surface of the polyester sheet having the hologram obtained in A) on the surface.
A metal reflection layer was obtained with a thickness of 500 mm to obtain a hologram-forming sheet made of a polyester resin as shown in FIG. (Example 2) C) A polyester resin was extruded from a T-die (2) to a thickness of 60 µm on a base sheet (11) of a biaxially stretched polyester film having a thickness of 100 µm under the following processing conditions. Similarly, a laminated sheet of polyester resins having a hologram on the surface was prepared. Base sheet; biaxially stretched polyester film (thickness 100
μ) Adhesive: Adcoat 527 / Adcoat 9L-1 (Two-part urethane adhesive manufactured by Toyo Morton Co.) Coat the lami surface on polyester film (11) with gravure 40μ plate. Resin used; NOVAPET 1065 Temperature setting; (A) Screw temperature 280 ° C (B) Adapter temperature 280 ° C (C) Die lip temperature 280 ° C Cooling roll temperature; 18 ° C Nip roll material; Carbon roll extruder; φ = 50m / mL / D = 26 D) Next, a hologram made of a polyester resin shown in FIG. 6 having an aluminum vapor-deposited layer with a thickness of 500 mm on the hologram surface of the polyester laminated sheet having the hologram obtained in C) on the surface and having a metal reflective layer A formed sheet was obtained. <Effect of the Invention> Since the hologram forming sheet described in the present invention and the hologram can be formed at the same time as the sheet is formed, the hologram can be produced extremely efficiently, and in addition to the surface obtained by applying a normal thermosetting resin, It has good resistance and can be widely used as various stickers. FIG. 7 shows the use of the hologram-forming sheet obtained in Example 2 as an example of the method of use, and the use of a base sheet of a polyester film, the use of a pressure-sensitive adhesive layer (11) on the base sheet (11) of the polyester film. FIG. 8 shows a case where a pressure-sensitive adhesive layer (13) is provided on the aluminum vapor-deposited layer (10) side and a polyester base sheet (11) is provided.
It is an example of a sticker that looks at the hologram from the side.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, FIG. 1 is an explanatory view of a manufacturing method of the present invention, FIG. 2 is a partially detailed view of FIG.
4 to 4 are cross-sectional explanatory views showing the state of the sheet in the manufacturing process, FIG. 5 is an explanatory view of a manufacturing method according to another embodiment of the present invention, FIG. 6 is a cross-sectional explanatory view of a hologram forming sheet, Seventh
FIG. 8 and FIG. 8 are cross-sectional explanatory views showing the use state of the present hologram forming sheet. (1) Extruder body (2) T-die (3) Cooling roll (4) Nip roll (5) Extruded synthetic resin (molten state) (5) '... (After cooling) (6) ) ... second cooling roll (7) ... take-up roll (8) ... take-up roll (9) ... relief hologram type stamper (10) ... metal reflection layer (11) ... base sheet (12) ... pressure-sensitive adhesive layer (13)… Pressure-sensitive adhesive layer

Claims (1)

(57) [Claims] The synthetic resin melt extruded from the T-die is pressed and cooled by a cooling roll having a relief hologram type stamper on the surface to produce a synthetic resin sheet having a hologram on the surface. A method for producing a hologram-forming sheet, comprising: providing a metal reflection layer on a hologram-forming sheet. 2. While pressing the synthetic resin melt extruded from the T-die on one surface of the base sheet with a cooling roll having a relief hologram type stamper on the surface, the sheet and the hologram non-formed surface of the melt are pressed. A method for producing a hologram-forming sheet, comprising: forming a laminated sheet having a hologram on the surface by extruding and laminating so as to be joined; and further providing a metal reflection layer on the hologram-forming surface. 3. 2. The method for producing a hologram-forming sheet according to claim 1, wherein the synthetic resin is a polyester resin. 4. 3. The method for producing a hologram-forming sheet according to claim 2, wherein the synthetic resin is a polyester resin. 5. The method for producing a hologram-forming sheet according to claim 2 or 4, wherein the base sheet is a polyester film having a thickness of 10 µm to 200 µm.