KR20000042009A - Master roll for holography and preparation method thereof - Google Patents

Abstract

PURPOSE: A master roll for holography is provided which has no occurrence of unit lines, can improve productivity because of the absence of heat distortion even during marking process, and also has an effect that the hologram phase produced does not deteriorate. CONSTITUTION: A master roll for holography is prepared by attaching a film-forming plate on which a hologram phase is recorded, on an inner wall of a cylindrical mold; inserting a shaft which is a support of a roll, into the mold; injecting a silicone resin and a curing agent into the space between the inner wall of the mold and the shaft to cure it; and then peeling the cured material off to prepare a cylindrical silicone master roll for holography on which a hologram phase is recorded.

Description

Holographic master roll and its manufacturing method

The present invention relates to a holographic master roll and a method for manufacturing the same, and more particularly, to a silicon holographic master roll capable of continuously producing a holographic film without a unit line and a method of manufacturing the same.

As for the holographic film and the recording method on the hologram, most of the holographic film is a synthetic resin film having a thickness of about 20 μm or less and a thickness of about 200 to 300 μm, and in some cases a metal thin film is used. In some cases. On the surface of this synthetic resin film, a holographic film can be produced by stamping with a hologram shim in which a hologram image is already recorded under a constant pressure and temperature.

The manufactured holographic film is projected and reproduced in natural colors by interference refraction and reflection of light, and the reproduced image is reproduced in three-dimensional stereoscopic image, which is generally referred to as a hologram image.

In the past, holographic films and the like have been made using laser beams, but since the work process requires extremely high precision, the workability and productivity are very poor, and in recent years, the hologram has been rarely used. It is mass-produced by making a molded plate and stamping it on the surface of a synthetic resin film.

Looking at the manufacturing method of the holographic molded plate used in the conventional holographic film production in detail; One method is to fabricate a holographic master roll by processing arbitrary embossing patterns with a laser on the outer surface of the metal roll, and another method is to process a hologram image with a laser beam on glass or the like and base it on a metal such as nickel. Electroplating using a metal and the like has been produced a nickel thin film reproducing the hologram image. The nickel thin film thus prepared is combined according to the size of the metal roll, and then wound 360 ° on the outer surface of the metal roll to obtain a holographic master roll.

The biggest drawback of these two methods is the high manufacturing cost, especially when the nickel thin film is manufactured and used as in the latter case, if a flaw occurs during use, the nickel thin film must be made again for a perfect hologram image. You must also accept. In addition, for the productivity, as the width of the metal master roll becomes wider, the nickel thin film made by electroplating also needs to be widened. Even since the thickness control of the nickel thin film has a great difficulty in the plating process, the holographic image is not completely regenerated due to the thickness variation of the nickel thin film in the engraving process of dealing with the holographic phase of 1 μm or less. However, in spite of these problems, the latter method has been selected and widely used until now because it is more productive than manufacturing an embossed pattern by laser to produce a holographic master roll.

On the other hand, various researches have been conducted to solve the above problems until recently, and as a result, a holographic image is first coated with a synthetic resin film such as PET, PVC, OPP, or another synthetic resin thereon, and then it is stamped with a nickel thin film. Secondary processing has been attempted using a reproduced holographic film (hereinafter referred to as a film molding plate).

However, if the film forming plate is wound on the surface of the metal roll, the above-mentioned problems can be solved to some extent. However, if the film forming plate is wound on the metal roll with an adhesive, the spot where the film cut surfaces meet is secondary. It appears as a unit line in the final product after stamping, and the gap between these lines becomes wider due to the heat shrinkage of the film forming plate when the temperature and pressure are continuously applied.

It is an object of the present invention that there is no occurrence of a unit line as described above, there is no thermal deformation during engraving, and thus productivity can be improved, while a holographic master roll made of a silicone resin that does not deteriorate with the usage period of the hologram is also used. To provide.

Another object of the present invention is to provide a method for manufacturing the silicon holographic master roll as described above.

The holographic master roll of the present invention for achieving the above object is characterized in that it is made of a silicone resin.

The present invention will be described in more detail as follows.

The present invention relates to a holographic master roll without a unit line. As mentioned above, when the nickel thin film is connected after the metal roll size is used, many unit lines are seen, and an adhesive is applied to the metal roll surface to form a film thereon. When the plate is used, the gap between the initial unit line appearing gradually widens due to the heat shrinkage of the film.

Therefore, in the present invention, the peeling rolls are directly processed by a method of attaching a nickel thin film or a film-forming plate to a metal roll, but the processing method is stripped from existing laser technology to produce a roll of synthetic resin. Silicone resins excellent in release property are suitable.

Looking specifically at the method of producing a roll without a unit line with a silicone resin and a synthetic resin as described above; First, make a cylindrical mold according to the size of the roll to be made, and then attach the film forming plate on which the desired hologram image is recorded on the inner surface of the mold. When the silicone resin and the curing agent as described above, which are high and have excellent heat resistance, are injected into the mold and cured, the desired hologram image is transferred and copied to the silicone resin as a mirror image. The transferred and copied holographic silicone resin has the shape of a thin film cylinder without unit line in the shape of the mold. Due to the viscoelastic properties of the silicone resin at the time of processing, the connection line of the film forming plate attached to the mold is minimized. Due to the flexibility of the resin, part of the pressure is absorbed by the silicone resin during processing, so there is no unit line in the final product, and the high heat resistance of the silicone resin can reduce thermal deformation such as heat shrinkage during use. It is possible to produce a holographic master roll.

In manufacturing and using the holographic master roll of the present invention, in order to increase the performance and workability, the thickness of the cylindrical silicon thin film on which the hologram image is transferred is important. Preferably, the thickness of the silicon thin film is 5 to 60 mm.

If the thickness of the silicon thin film is less than 5mm, there is a difficulty in processing due to the difficulty in processing, and if the thickness of the silicon thin film is greater than 60mm, there is a problem in the heat transfer due to the nature of the silicone resin, thereby limiting the implementation of the hologram image.

In addition, the selection and curing conditions of the silicone resin to be used are also very important. The use ratio of the silicone resin and the curing agent is preferably 0.5 to 3 parts by weight based on 100 parts by weight of the silicone resin.

The curing conditions are preferably aged at 60 ° C. for 1 day and then aged at 180 ° C. for 12 hours.

In this case, when the ratio of the silicone resin and the curing agent is low, the surface hardness is weak, and the effect of the engraving for the implementation on the hologram is reduced, and when the ratio is high, the hardness of the film is high, which also degrades the workability of the engraving.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited by the Examples.

Example 1

1 part by weight of the curing agent CAT-1600 was mixed with 100 parts by weight of KE-1600 manufactured by Shin-Etsu Co., Ltd., Japan, and poured into a predetermined mold, and then cured and aged at 180 ° C. for 12 hours at 180 ° C. for 1 hour. Then, the surface of the metal roll was peeled off from the mold and applied to the stamped foil developed for holographic by using the roll as a roll to compare workability and unit line. At this time, the film thickness of the silicone resin was 30 mm.

Comparative Example 1

It is the same as Example 1 except that the master roll made by connecting a 12 '' x 12 '' nickel molded plate instead of the master roll using the silicone resin is carved into the stamping foil.

Comparative Example 2

It is the same as Example 1 except the conventional film forming plate (75 micrometers) instead of the master roll using a silicone resin was engraved in the stamping foil with the master roll made using the adhesive agent on the metal roll surface.

Experimental Example

The hologram image over the entire width of 1580 mm of the holographic stamping foil used after engraving was visually judged to evaluate good things ◎, normal things ○, poor things △, and poor things x.

Then, the interval change of the unit line after 8 hours of use was measured.

The results are shown in Table 1 below.

Hologram award Unit line spacing Unit line spacing change Example 1 ◎ None None Comparative Example 1 ◎ 2 mm 0 mm Comparative Example 2 ◎ 1 mm 2 mm

In the case of engraving using the holographic master roll made of the silicone resin according to the present invention from the results of Table 1, the unit line is compared with the case of using a master roll bonded with a conventional nickel thin film or film-forming plate. It can be seen that it does not occur itself.

As described above, according to the present invention, when the cylindrical silicone resin thin film on which the hologram image is transferred is used as the roll on the surface of the metal roll, there is no unit line that can be seen in the final product and it is used by using the silicone resin having high heat resistance. The shortcoming of unit line spacing caused by heat shrinkage is also solved, which improves the quality and productivity of the final product.

Claims (4)

Holographic master roll made of silicone resin thin film. Attaching the film forming plate having the holographic image recorded on the inner wall of the cylindrical mold; Inserting the shaft which is the support of the roll into the mold, A method of manufacturing a holographic master roll, comprising the steps of preparing a cylindrical silicon holographic master roll on which a hologram image is recorded by injecting and curing a silicone resin and a curing agent between the mold inner wall and the shaft. The method for producing a holographic master roll according to claim 2, wherein 100 parts by weight of the silicone resin and 0.5 to 3 parts by weight of a curing agent are added to the mixture. The method of manufacturing a holographic master roll according to claim 2, wherein the holographic master roll has a thickness of 5 to 60 mm of the silicone resin thin film.