JPS5860703A - Production for marking plate for security - Google Patents

Abstract

PURPOSE:To obtain a display plate where formable complicated patterns and characters can be expressed, by forming a reflective layer on the groung by screen printing and forming a bead containing layer containing glass beads having a specific size on this reflective layer and overcoating the surface of this layer. CONSTITUTION:A reflective layer 2 of a pattern or a character is formed on iron plate as the ground by screen printing, and after drying, the same screen plate is used to form a bead containing layer 4, where glass beads having 4- 2,500 microns diameter such as minute and transparent soda glass beads or flint glass beads 3 and 3' having 1.5-2.2 refractive index are mixed, on the surface of the later 2. An overcoat layer 5 is formed on the surface of the layer 4 with a transparent solvent epoxy or the like for the purpose of enhancing the resistance to weather and the resistance to pollution of a marking plate. Thus, formable complicated patterns and characters are expressed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing safety sign boards used on roads, tunnels, factories, mines, construction sites, etc.

On roads, tunnels, factories, mines, construction sites, etc.
In some cases, a safety sign board is required to indicate ``This location is under construction'' or ``σ times are required at this location.'' Such a security sign board has a yellow slope on a black background. Generally, a so-called zebra mark with a striped pattern is painted on, and in order to make this safety sign board noticeable at night or in a dark place, there is a conventional method of illuminating the sign board with a lighting lamp, or an electric sign board. There are two ways to do this, including installing rotating lights and warning lights nearby. However, these facilities are complicated, bulky, and expensive. In recent years, retroreflective sign boards have been adopted in which reflective lenses are attached to the surface of these safety sign boards so that the reflective lenses shine when exposed to light. These retroreflectors have become increasingly popular in recent years because they do not require any illumination equipment and are simple to install.

The present inventor has recently completed research on a method for manufacturing a reflective material containing transparent small spheres, and has filed a patent application. This transparent microsphere-containing reflective material is a retroreflective material in which the transparent microspheres shine when exposed to night light, like the reflective lens described above, and a large number of such small transparent microspheres are placed on the surface of an object. The feature is that it can be printed by screen printing. Therefore, in contrast to conventional sign boards using reflective lenses, the production method of printing and adhering transparent small spheres using a screen printing machine allows fairly complex patterns and letters to be created. It is an invention of a manufacturing method that can still be mass-produced industrially at relatively low cost.

The present invention relates to a method of manufacturing a security sign board, and the security sign board according to the present invention has the above-mentioned transparent small balls screen-printed on its surface.

An enlarged side cross-sectional view of a portion of the safety signboard according to the present invention on which the retroreflective material is printed is shown in FIG.

Portions of the safety sign board that do not require retroreflection can be painted using a normal flow coater, roll coater, percoater, or other painting line, and this must be done before printing the retroreflective material of the present invention. It can also be done after screen printing the retroreflective material.

In the retroreflective screen-printed safety sign board shown in FIG. 1, the base material, an iron plate 1, is surface-treated with phosphate or the like, or is previously coated with a background pattern.

A reflective layer 2 with a certain shape of pattern or letters is formed on the surface of the iron plate 10, which is the base material, by screen printing.

The screen used in the screen printing ranges from 15 mesh to 400 mesh. In the reflective layer ink used, the paste resin is an epoxy resin or a synthetic resin such as polyamide, polyurethane, or acrylic, and a small amount of coloring agent and filler such as calcium carbonate, magnesium sulfate, silica powder, etc. are also used for white reflection. In some cases, silver powder or pearl powder is mixed and a prepared ink is used.

After the reflective layer 2 is formed and dried, a bead-containing layer 4 containing beads 33' is formed on its surface using the same screen plate.

The ink used contains glass beads with a diameter of 4 microns to 2,500 microns and a refractive index of 1.5 to 2.2. Fine and transparent soda glass beads or flint glass beads are mixed in. .

After the bead-containing layer 4 is formed and dried, an overcoat layer 5 is formed on its surface.

The overcoat layer 5 can be made by screen printing using the same screen, or by using a normal roll coater.
Alternatively, it can also be made using a curtain coater. The inks used are transparent, solvent-borne epoxies, or acrylic synthetic resin lacquers. The overcoat layer 4 serves to improve the weather resistance and stain resistance of the sign board.

FIG. 2 is a front view of a safety sign board manufactured by the manufacturing method of the present invention.

The base iron plate, which has a thickness of 0.27 mm and a length of 600 mm and a length of 1,700 mm, is completely coated black using a roll coater in advance. 11 shows a part where the black paint is visible and no retroreflective printing is applied.

Epoxy resin medium 5 by roll mill in advance
0 parts, 20 parts of silica powder, 15 parts of calcium carbonate, 15 parts of yellow colorant, and 15 parts of pearl powder to make an ink for the reflective layer, and use a 40-mesh screen plate to create the yellow sloped pattern area 12. Screen print layers. After the reflective layer is screen printed, it is dried at 120° C. for 20 minutes, and after the reflective layer is dried and hardened, a bead-containing layer is formed thereon using the same screen plate. The bead-containing layer ink used is 1 part epoxy medium, diameter 44
Soda glass beads with specific gravity 2.6 from μ to 64μ 2.2
5 parts and 0.015 parts of a yellow colorant. 2 at 120°C after screen printing of the bead-containing layer.
After drying for 0 minutes and drying and curing the bead-containing layer, an overcoat layer is screen printed thereon using the same screen plate. The overcoat required ink used is a mixed ink of 100 parts of epoxy ink and 30 parts of acetone solvent to form a layer of 10 g/m. This is a zebra mark security sign board with a striped pattern 12, and is hung from an iron frame 13 and used as a road traffic safety barricade.

The safety signboard according to the present invention was tested for its reflective performance when irradiated with light at night, and was found to be able to be sufficiently identified by car headlights from a distance of 400 meters, and was equipped with auxiliary lighting near the barricade. I didn't need it.

[Brief explanation of the drawing]

FIG. 1 is an enlarged side sectional view of a portion of a safety signboard according to the present invention on which retroreflective material is printed. FIG. 2 shows a front view of a safety sign board manufactured by the manufacturing method of the present invention. 1 is the base iron plate, 2 is the reflective layer, 3 is the bead, 4 is the bead-containing layer, 5 is the overcoat layer, 11 is the part where the retroreflective material is not printed and the black paint is visible, and 12 is the part where the black paint is visible. Agent Yoshihiko Okoshiguchi 1

Claims (1)

[Claims] A reflective layer 2 is formed by screen printing on the base iron plate 1.
A method for manufacturing a security sign board, in which a bead-containing layer 3 containing glass beads having a diameter of 4 microns to 2,500 microns is formed by screen printing using the same screen plate, and an overcoat layer 4 is formed on the surface of the bead-containing layer 3.