JPH0747142B2 - Method for creating patterns on reflective molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a method for creating patterns such as letters and figures on a reflective molded body formed by forming a reflective thin film on one surface of a transparent molded body such as plastic or glass. is there.

[Conventional technology]

It is used as a mirror for makeup etc. by forming a reflective thin film on one surface of a molded body such as a transparent plate-shaped body such as plastic or glass. Simple letters and designs related to the product are used in the corners of this mirror. In many cases, it is desired to display a graphic.

Generally, to apply a pattern such as etching-like characters to a reflective molded body, undercoating is required on one side of a transparent molded body such as plastic, and masking printing should be performed on it to reveal it. After forming a mask of patterns such as letters and reflection patterns (patterns in the shaded areas), then apply dry plating such as metal deposition over the entire surface, then peel off the mask to reveal the patterns of letters etc. A masking method is known in which a colored top coat is applied to the entire surface.

In addition, a transparent molding such as glass using a printing method that directly prints patterns such as letters on the surface (mirror surface) of the reflecting molding on which the reflective thin film is not formed, or a chemical such as hydrogen fluoride water. An erosion method is known in which erosion is performed so as to expose a pattern on the surface.

[Problems to be solved by the invention]

However, in the case of the masking method, factors related to printing technology, such as ink stains, ink curing and drying time, and mask releasability, will greatly affect the finish of the mirror as a finished product. If a few factors such as stains, ink splashes, dust, printing mistakes, printing defects, etc. are included in the printing process, it will no longer be a true mirror surface and will lose its intrinsic value as a mirror. Becomes This is a problem that cannot be avoided because the process of printing is included. In addition, since steps such as drying and peeling of printing are required, there are drawbacks such as time-consuming and high manufacturing costs.

Next, in the case of the printing method, in addition to the drawbacks caused by the printing step in the masking method, there were serious drawbacks such as stains of ink even during use.

Furthermore, in the case of the erosion method, a special powerful drug such as hydrogen fluoride water is used, so great care must be taken in safety management and the work precision is essentially poor. This requires a great deal of labor and time to form, and has a drawback that the manufacturing cost becomes high.

[Means and actions for solving problems]

In view of such a situation, the present invention is to laminate an antireflection film on a surface of a reflective molded body formed by forming a reflective thin film on one surface of a transparent molded body such as plastic or glass without forming the reflective thin film or laser. It is installed before processing, and transmits infrared laser beam with wavelength of 700 ~ 30,000NM through the antireflection film.
By irradiating the position where a pattern such as a figure is formed and removing the reflective thin film in a pattern, a fine pattern such as letters and figures can be formed accurately, highly efficiently and inexpensively without impairing the quality of the mirror surface. The present invention will be described in detail below by providing a method for producing a pattern on a reflective molded body that enables the above.

The reflective molding used in the present invention is formed by forming a reflective thin film on one surface of a transparent molding such as a transparent plate. The transparent molded product has various shapes such as a transparent plastic plate and a flat plate such as a glass plate, and also has various shapes such as a convex surface and a concave surface. Plastic molded products include methacrylic resin, polycarbonate resin, vinyl chloride resin, Molded bodies made of AS (acrylonitrile-styrene copolymer) resin, PS (polystyrene) resin, polyester resin, and other various transparently moldable resins are used.
As the glass molded body, molded bodies made of various kinds of glass such as sodium glass and potash glass are used. Also,
As the reflective thin film formed on one surface of the transparent molded body, when the transparent molded body is a plastic molded body, vacuum deposition,
A metal thin film by dry plating (vapor phase plating) such as ion plating or spattering is preferable.

Next, a detailed description will be given of the case of forming a metal thin film on the plastic molded body. First, one side or both sides of the plastic molded body are removed with a fluorine solvent to remove oils, dusts, dusts, etc., and an organic undercoat is used. Give. However, if the surface of the plastic molded product is smooth and there is no adhesion of oils and fats, and even if dry molding is performed directly in that state, a sufficient mirror surface can be obtained, or if the dry mechanical layer is plastic molded product. It is not necessary to apply an undercoat when closely contacting. The undercoat is applied, for example, when the plastic molded article is not smooth or when the dry plating layer does not directly adhere to the plastic molded article. As this organic undercoat, acrylic type,
A resin selected from urethane-based, epoxy-based, vinyl-based, polyester-based resins, alkyd resins and the like, or a coating made of a modified resin thereof is suitable. As the coating method, there are spray coating, dip coating, flow coater coating, etc. In consideration of quality such as mirror surface, dip coating, flow coater coating, etc. are preferable. In addition, the coating thickness is preferably about 5 to 20μ, and the coating curing mode is evaporation drying type,
A reaction curable type, an ultraviolet curable type or the like can be appropriately used depending on the situation. Next, the plastic molded article coated as described above is subjected to dry plating such as vacuum deposition, ion plating, and spattering, and topcoat is applied to protect the metal thin film formed by the plating. As the organic topcoat, vinyl-based, urethane-based, acrylic-based, epoxy-based, polyester-based paints, etc. are used. In particular, when only the metal thin film is destroyed, melted, or evaporated by the laser irradiation described below, the color of the top coat is made to appear so that the color of the top coat can be clearly seen from the mirror surface side of the plastic molded body. In addition to pigments, it is desirable to use paints containing opaque pigments and extender pigments. As a topcoat coating method, spray coating is desirable, and the coating thickness must be sufficient to provide opacity and corrosion resistance. By drying and curing the top coat, each layer of the under coat, the metal thin film and the top coat is formed on the plastic molded product, and the plastic mirror having the non-coating surface as the mirror surface is obtained.

When the transparent molded product is a glass molded product, a metal thin film utilizing a silver mirror reaction using a water-soluble silver compound such as silver nitrate and a reducing agent such as formalin or hydrazine may be formed on one surface of the glass molded product. Although desirable, it is not limited to this, and an appropriate method can be used.

The reflection molded article thus obtained, such as plastic or glass, is laminated on the non-coating surface (mirror surface) by attaching an antireflection film, or is installed between the laser and the processed plate before laser processing. As the antireflection film, a semitransparent film made of various resins such as polyethylene is desirable, but it is sufficient if it has an antireflection effect on the infrared laser beam used in the wavelength range of 700 to 30,000 NM, and in the case of visible light. In some cases, a resin film that is inferior in transparency but looks almost transparent can be used. The antireflection film prevents the laser beam from being reflected by the reflective molding and causing damage to the equipment and injury to the user.

Next, the wavelength generated by the laser generator 700-30,000N
The direction is set by using a polarizing mirror that can freely rotate the infrared laser beam of M, and the lens is focused to a position where a pattern such as letters and figures is formed from the antireflection film surface of the reflective molding. Irradiation is performed, and the antireflection film and the transparent molded body are transmitted to destroy, melt, and evaporate only the reflective thin film at the irradiation position. Various laser beams can be used as the laser beam, but YAG laser (wavelength 1,060
NM) and carbon dioxide gas laser (wavelength 10,600 NM) are suitable.

If the focusing points of the infrared laser beam are strictly adjusted, for example, of the undercoat, metal thin film, and top coat in the reflective thin film, if only the metal thin film is evaporated without damaging the undercoat or top coat, the reflective molding When viewed from the mirror side of the body, the color of the top coat is letters,
The floating will be seen as a fine pattern such as a figure.

〔Example〕

Example 1 Polymethylmethacrylate (PMMA) [methacrylic resin]
After coating the transparent plate (thickness 1 mm) formed by the method with an ultraviolet curing coating to a film thickness of about 10 μm by the dipping method and curing, a semi-transparent polyethylene sheet with a thickness of 0.1 mm is protected on one side from scratches and the like. It was coated for the purpose of preventing reflection of infrared laser beam, and an aluminum thin film was adhered to the other surface by vacuum evaporation in a vacuum of 1 × 10 ^-4 Torr to a thickness of 700 to 10000Å. Further, an organic top coat of a paint having the following composition was applied on the aluminum vapor-deposited surface in order to protect the aluminum thin film, prevent corrosion, and reveal the color of the etching pattern.

Polybutadiene-based resin 18% by weight Epoxy-based resin 2 〃 phenolic resin 4 〃 extender pigment 21 〃 hydrocarbon solvent 55 〃 Topcoat coating is 20-30μ thick by spray method, 30 minutes at 60-70 ℃ It was dried. The obtained reflective plate was attached to the compact of the cosmetic container with the polyethylene film side up and the aluminum thin film side down, and the infrared laser beam generated with an output of 10 to 20 W from the Nd: YAG rod was placed above. More irradiated. Since the focusing of the infrared laser beam by the lens was at the position of the aluminum thin film of the reflective plate, the laser beam transmitted through the polyethylene film and the transparent plate and destroyed, melted and evaporated only the aluminum thin film into a fine pattern. . Depending on the degree of removal of this aluminum thin film, some of the organic topcoat, which is the protective film, was removed and destroyed, but not all of the topcoat was removed, and when viewed from the polyethylene film side, the color of the topcoat was Was seen in a fine pattern. Finally, the polyethylene film was peeled off and used as a compact mirror in which a cosmetic container, a cosmetic, was placed.

Example 2 The reflective plate in Example 1 was used, and on one side of a transparent glass plate, a solution A mainly containing 6.7 g / of silver nitrate aqueous solution and formalin 65 m
The antireflective film was removed in a fine pattern when almost the same procedure was performed except that the silver thin film was formed by treating with a 9: 1 mixed solution mainly containing l /. I got a mirror.

〔The invention's effect〕

As is clear from the above description, according to the present invention, it is possible to easily form a fine pattern such as letters and figures on a reflective molded product obtained from a plastic or a glass molded product by using an infrared laser beam without polluting the mirror surface. In addition, it can be formed in a short time, and can be performed as the last step in the series of manufacturing steps by irradiation from the mirror surface side, and it is possible to form an observable pattern without inversion. By using the antireflection film, it is possible to protect the mirror surface, and it is also possible to obtain excellent operational effects in practice, such as preventing damage to equipment by laser beams and accidental injury of workers.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Shimada 35 Tsuda Kogyo Co., Ltd. 25, capital 25, Namerikawa-cho, Hiki-gun, Saitama Prefecture (72) Inventor Haruo Okado 25th capital, Namekawa-cho, Hiki-gun, Saitama Prefecture 35 Tsuda Industry Co., Ltd.

Claims (1)

[Claims] 1. An antireflection film is laminated on the surface of a transparent molded body such as plastic or glass having a reflective thin film formed on one surface thereof, on which the reflective thin film is not formed, or erected before laser processing. The wavelength of 700 to 3 after passing through the antireflection film.
A method for creating a pattern on a reflective molded body, which comprises irradiating an infrared laser beam of 0,000 NM to a position where a pattern such as a character or a figure is formed to remove the reflective thin film in a pattern.