JPS6142832Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an engraved metal foil laminate with excellent decorative properties.

Conventionally, as this type of laminate, there is a laminate in which a metal foil and a thermoplastic synthetic resin substrate are laminated together via a rubber-based or epoxy-based adhesive. by the way,
The use of etching desired characters and figures on the surface of the metal foil of such a laminate to display a display with a contrast between the transparent or reflective color of the substrate and the external color peculiar to the metal foil;
For example, when used for lighting covers, display boards, signboards, etc., rubber adhesives resist ultraviolet rays, ozone, water, etc. and easily discolor and deteriorate, while epoxy adhesives have the property of forming an opaque layer. Because of this,
Unless the adhesive layer remaining in the etched portions is removed, the adhesive layer cannot be used satisfactorily for the above-mentioned purposes.

Further, since the metal foil is smooth and formed in a single color, it has the disadvantage that the characters and figures expressed by the engraved portions cannot exhibit sufficient decorativeness.

This invention aims to solve the above-mentioned drawbacks and provide a metal foil for etching with even higher decorative properties. and a thermoplastic synthetic resin substrate are laminated and integrated via a heat-sensitive transparent adhesive having chemical resistance, and an uneven pattern with a depth of 30 to 50 μm is formed on the surface of the metal foil, and the protrusions of the pattern are This is done by polishing and removing the colored layer.

Embodiments of this invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a metal foil on which a colored layer 2 is formed by chemical treatment such as sulfurization or oxidation, and is made of, for example, copper or aluminum with a thickness of 25 to 50 μm. Further, the surface of the metal foil of the colored layer 2 is colored by changing into one or more metal compounds, and has the property that it can be easily etched with an ordinary etching solution. 3 is a thermoplastic synthetic resin substrate, for example, polyvinyl chloride resin, polymethyl methacrylic acid resin, acrylonitrile-butadiene-styrene copolymer, etc. are used, and the color tone, transparency, thickness, etc. are selected depending on the application. be done. 4 is a heat-sensitive transparent adhesive with chemical resistance, for example, by introducing a special functional group into a base resin such as polyolefin, it can be applied to various resins, metals, paper, wood, etc. just by heat and pressure bonding. It is adhesive, transparent, and stable against ultraviolet rays, ozone, water, etc., and usually has a thickness of 30 mm.
~80μ film-like material is used. Reference numeral 5 denotes an uneven pattern with a depth of 30 to 50 μm formed by embossing the metal foil surface when the metal foil 1 and the thermoplastic synthetic resin substrate 3 are laminated together via the adhesive 4. Embossing is carried out by placing a conventional means for forming an embossed pattern, such as a mold roll or a template on which an uneven pattern is formed, on the surface of the metal foil and applying pressure. The shape of the concave-convex pattern 5 is not particularly limited, such as a regular shape or an irregular shape, but when used for an advertising signboard or display board, a grain pattern or the like is preferable. Here, if the depth of the uneven pattern 5 is 30μ or less, when the colored layer 2 is polished to remove the colored layer 2a in the convex portions as described later, the colored layer 2b in the concave portions of the pattern 5 will also be removed at the same time. This is because, as a result, the decorativeness deteriorates, and if it is more than 50 μm, the protective film formed on the metal foil surface other than the engraved area when characters and figures are etched, especially the outline of the characters and figures. This is because the formation becomes unclear and, as a result, it becomes impossible to etch with high accuracy.

The thus obtained laminate is polished by polishing the convex portions of the uneven pattern 5 on the metal foil surface with a wire brush, buff, sandpaper, etc.
A metal foil laminate for etching is obtained in which the color layer 2b is removed and the colored layer 2b remains only in the recesses.

As described above, this invention eliminates the need to remove the adhesive layer remaining in the etched portion even when used to display characters and figures by etching the metal foil of the laminate. The adhesive layer also serves as a film that prevents fading of the substrate, so that the color tone can be maintained and displayed over a long period of time. In addition, since the metal foil surface has an uneven pattern and a colored layer is formed in the concave areas, it has excellent decorative properties, and together with the color tone of the board expressed by the etched areas, it creates a colored visual effect and a three-dimensional visual effect. can be increased. Furthermore, the depth of the uneven pattern
Since the thickness is set to 30 to 50μ, characters and figures can be engraved with the same precision as conventional smooth metal foil laminates.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention.
The figure is a sectional view showing the material in the manufacturing process of this invention, and FIG. 2 is a sectional view of this invention. 1...Metal foil, 2...Colored layer, 3...Substrate, 4
...Adhesive layer, 5...Uneven pattern.

Claims (1)

[Scope of utility model registration request] A metal foil with a colored layer formed on the surface by sulfurization or oxidation, etc., and a thermoplastic synthetic resin substrate are laminated and integrated via a heat-sensitive transparent adhesive having chemical resistance, and a depth of 30 mm is applied to the surface of the metal foil. A metal foil laminate for engraving, which is formed by forming an uneven pattern of ~50μ and removing the colored layer on the convex portions of the pattern by polishing it.