JPH0369402B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method for forming a road marking body using a heat-melting road marking material having thixotropy. (Prior art) The conventional method for forming this type of road marking body is as follows:
For example, as shown in Japanese Patent Publication No. 58-2282, a predetermined amount of hot-melted road sign material is deposited on the road surface, while an oil-based mold release agent with a predetermined viscosity is applied to the inner surface of the mold. Then, a reflective material is attached, and the road display material is molded into a predetermined shape using this formwork, and the reflective material is embedded in the surface of the molded road display material. . (Problems to be Solved by the Invention) However, in the above molding method, the reflective material is forcibly pressed into the surface of the road marking material by the mold while the road marking material is still in a molten state. As a result, the reflective material is not uniformly exposed on the surface of the road marking body after molding, and in some cases, the reflective material may be buried inside the road marking body. Furthermore, it is necessary to apply an oil-based mold release agent into the mold each time to improve the releasability of the mold from the road sign, and overall workability cannot be said to be good. The present invention was developed in view of the above-mentioned problems, and its purpose is to provide a method for molding road markings that allows reflective material to protrude uniformly on the surface of road markings and that is also highly workable. We are trying to provide the following. (Means for Solving the Problems) In order to achieve the above objects, the present invention uses a heat-melting type road display material having thixotropy, melts the display material by heating, and melts the display material in a predetermined amount. a step of dropping the display material to deposit it in a mountain shape; a step of scattering a reflective pattern on the surface of the display material when its shape approaches a completed molded product due to the flow of the deposited display material; When a predetermined amount of a part of the material has settled in the material, a predetermined road display material is formed by a step of rapidly cooling the surface of the display material and a step of molding the display material using a cooled mold. I made it. (Function) According to the molding method of the present invention, the reflective material is partially embedded in the road marking body, in other words, the upper part of the reflective material protrudes a certain amount from the surface of the road marking body. It is fixed in the state. (Example) Examples of the molding method according to the present invention will be described below. First, we will explain the case where it is installed directly on the road surface. When the heat-melting road display material 1 used for the road display of the present invention is installed directly on the road surface, it can be divided into two types depending on the construction site and weather conditions. One is for roads with low traffic volume and when the air and road surface temperatures are at an appropriate temperature (15 to 20 degrees Celsius). It can be used. The other type is designed to be widely used even when traffic volume, air temperature, and road surface temperature are not favorable conditions, and its composition is summarized in the table below.

[Table] Examples of the thixotropic agent include colloidal silica, asbestos, hydrogenated oil fatty acid ester, metal soap, pentonite, and the like. The resins and plasticizers used are those conventionally used in welding paints, including petroleum resins and rosin-modified maleic resins that can adhere to paved road surfaces and existing traffic paints applied to paved roads. It is made by adding commonly used plasticizers such as mineral oil and phthalate ester to ordinary hard resins such as may also be used. The aggregate has a particle size of 0.3 to 3 mm with an appropriate particle size distribution, and the materials used include silica sand, ceramic pieces, agar stone, crushed glass, etc. In addition, glass fibers and scaly glass pieces are used. , mica, etc., are used as aggregates in the form of fibers or plates that cannot be used in traffic paint applied with ordinary coating machines, and these reinforcing materials strengthen the display body after molding. You may also do so. The reflective material uses glass beads with a refractive index of 1.5 and an average particle size of 0.4 to 0.5 mm, which are used in ordinary traffic paint, but other glass beads with a large particle size of 1 to 3 mm are used to create a reflective effect. You may also try to increase the. In order to prevent the glass beads from coming off, it is desirable to use surface-treated glass beads, and it is also desirable to use glass beads with a high curvature (for example, 1.8). The pigments used are pigments used in ordinary traffic paint, such as yellow heat-resistant yellow lead and white titanium oxide, and the fillers are calcium carbonate powder,
Silica powder or the like is used. In addition to the above materials, additives used in ordinary traffic paints, such as antioxidants and ultraviolet absorbers, are used. Therefore, the heat-melting road display material 1 is
It is used by heating and melting it at a high temperature of 150 to 220°C. First, a primer is applied to the road surface where the display will be installed using the same method as applying welding paint, and after drying, the melted display material 1 is applied. A predetermined amount of the solution is dropped onto the road surface using a metal ladle, and is deposited in the shape of a mountain as shown in FIG. In addition, if a road marking has already been constructed at the location where the road marking is to be installed, and this road marking material is, for example, vinyl paint, etc., which is not compatible with the heat-melting type road marking material 1, the existing road marking material may be After removing or incinerating the road marking material, apply a primer as described above. By the way, the above-mentioned heat-melting type road display material 1 is generally made by adding a thixotropic agent and an aggregate to a welding paint, so it has a higher thixotropy than a general welding paint. Not only is it extremely unlikely to deform during high temperatures in the summer, it also has excellent impact resistance, durability, adhesion of reflective materials, and adhesion to the road surface. The heat-melting road display material 1 at 150 to 220°C, which has been dropped and deposited in a mountain shape on the road surface as described above, is thixotropic and therefore does not flow easily. The top of the droplet gradually becomes lower and deforms into a truncated cone shape, as shown in Figure 2. When it approaches the diameter of the body, an appropriate amount of reflective material 2 made of glass beads is sprinkled on the road marking material 1, as shown in FIG. The reflective material 2 sprinkled on the surface of the road display material 1 is the same as the reflective material that is the assembling material of the road display material 1. However, at the time of spraying this reflective material 2,
The road marking material 1 must have a material temperature suitable for sinking and burying the reflecting material 2, that is, 100 to 170°C, and by adjusting the material temperature when the road marking material 1 is dropped. , the above conditions are satisfied. By the way, if the material temperature suitable for settling and burying the reflecting material 2 is expressed by the time required for the reflecting material 2 to settle with respect to the road marking material 1, then 5.
~100 seconds, preferably 10-20 seconds. The time required for settling here means the settling time required for the reflecting material 2 having an average particle size to sink one half of its diameter below the surface of the road marking material 1. Next, if half of the dispersed reflective material 2 sinks below the surface of the road marking material 1 as shown in FIG. Cooling water is poured over the road marking material 1 to cool it rapidly until the surface temperature reaches 20 to 40°C, and then, as shown in FIG. Then, the road marking material 1 is formed into a predetermined shape. As shown in FIG. 5, the formwork 3 is made of metal and has a recessed part 31 corresponding to the shape of the road marking body 4 to be molded, and a handle 32 is attached to the center of the outer surface of the formwork 3. The above-described formwork 3 is cooled in advance to below 30°C, and then placed over the surface of the road marking material 1 as shown in FIG. The road marking body 1 is formed on the road surface. Incidentally, if the formwork 3 cannot be cooled with another equipment, a cooling water storage section may be provided in the formwork 3 for cooling. By the way, the surface temperature of the road display material 1, which has reached 20 to 40 degrees Celsius due to the rapid cooling process, is 10 degrees Celsius if left as it is.
Within seconds, the surface temperature rises again to 40 to 60°C due to the internal heat of the road marking material 1, and the area where the temperature reaches 40 to 60°C is 0.5 to 0.5° from the surface of the road marking material 1.
2 mm on the surface of this road marking material 1.
When a 0.5 to 2 mm thick layer is pressed by the mold 3 at this temperature, it will bend as a layer, but the reflective material 2 will harden while remaining embedded in a predetermined amount. As the surface of the road display material 1 is pressed and molded by the formwork 3, heat radiation to the cooled formwork 3 and heat transfer from inside cause the road display material to be Since the surface temperature of the material 1 is maintained in equilibrium, the reflective material 3 buried in a predetermined amount on the surface of the road marking material 1 will not sink any further into the road marking material 1. Therefore, on the surface of the road marking body 4 formed by the molding frame 3, a part of the reflective material 3 is buried to a certain depth, and only the upper part is buried by a predetermined amount. It will be exposed from the surface. In addition, along with the molding by the mold 3, the mold 3
The display material 1 that has protruded from the inside to the outside is removed, and after the molding using the formwork 3 is completed, the formwork 3 is removed and the road display material 4 that has been molded is removed. Cooling of the road marking body 4 may be accelerated by allowing it to cool naturally in the atmosphere or by further spraying cold water on it. Since the molding process using the formwork 3 is carried out after the surface of the road marking material 1 is rapidly cooled and hardened with cold water, the road marking material 1 does not adhere to the formwork 3 and is Therefore, when removing the formwork 3, it can be easily removed without applying a mold release agent to its inner surface. In the above embodiments, the road marking material was dropped and deposited on the road surface coated with a primer, but in other cases, road markings using welded paint that is compatible with the road marking material 1 have already been applied to the road surface. If the asphalt road surface has already been constructed or is newly constructed, the road surface is heated to 80% by burner, etc.
If the asphalt is melted by heating to ~90°C and the molten road marking material is dropped onto the molten road surface, the primer may not be used. The reason why a primer is not required for newly constructed asphalt road surfaces is that the surface of the aggregate and stone powder mixed with the asphalt material is wrapped in the asphalt material, and the aggregate and stone powder are not exposed on the road surface. Therefore, when the road surface is heated, the heated portion becomes a melted asphalt material and is bonded to the road marking material. Furthermore, in the above embodiments, the road markings were molded directly onto the road surface, but they may be molded in advance at a factory or the like. In this case, a flat plate with excellent mold releasability is used.
The road marking material 1 is dropped onto the flat plate and formed in the same manner as described above, and when the road marking material 4 manufactured in advance at a factory etc. as described above is installed on the road surface, After applying a primer to the installation road surface and drying it, heat-melt the same heat-melting type road display material as the molding material for the road display body 4 and drop it onto the road surface, and place the road display on it. All that is required is to press the body 4. The road marking body 4 formed by the method according to the present invention as described above has a substantially conical shape as shown in FIG. 6, with a road surface height of about 15 mm and a diameter of about 140 mm, for example. The height of the road indicator 4 described above varies somewhat depending on the condition of the road surface on which it is installed, but as long as it is 10 mm, it will not lose its reflective performance even when there is a lot of rain. Furthermore, unlike general plastic or iron display bodies, the road display body 4 described above contains a reflective material throughout the material, so it maintains its reflective performance as long as even a small amount of the material remains. Further, the color of the road display body 4 described above is mainly white or yellow, but both the color and shape can be changed as necessary. (Effects of the Invention) As described above, according to the present invention, the reflective material is uniformly embedded in the molded road marking body, and the upper part of the reflective material is uniformly spread over the surface of the road marking body by a predetermined amount. Therefore, when the display body is installed on the road surface, excellent reflective performance can be obtained. As shown in the figure, the road marking body can be easily removed from the formwork without applying a mold release agent to the inner surface of the formwork, thus improving work efficiency.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the heat-melted road display material deposited by dropping, FIG.
The figure is a cross-sectional view showing a state in which a part of the scattered reflective material has settled into the display material, FIG. 4 is a cross-sectional view showing the road display material being molded by a formwork, and FIG. 6 is a partially cutaway front view of the formwork, and FIG. 6 is a perspective view of a road marking body completed by the molding method according to the present invention. 1... Heat-melting road display material, 2... Reflective material, 3... Formwork, 4... Road display material.

Claims (1)

[Scope of Claims] 1. A step of heating and melting the display material using a heat-melting road display material having thixotropy, and depositing a predetermined amount of the display material in a mountain shape, and the deposited display. When the shape of the body material approaches that of a completed molded body due to the flow of the display body material, a step of scattering a reflective material on the surface of the formed body, and when a predetermined amount of the reflective material has settled within the display body material, the display A method for forming a road sign comprising the steps of rapidly cooling the surface of a road sign material and molding the sign material using a cooled mold. 2. Claim 1 characterized in that a heat-melting road display material whose main components are resin, plastic material, aggregate, pigment, filler, reflective material, and thixotropy is used.
Method for forming road markings as described in Section 1.