JPH02304105A - Glass bead planting method in fusing type road zone demarcating line - Google Patents

Abstract

PURPOSE:To secure night visibility, to keep glass beads free from moisture, and to reduce scattering of spread amount by providing a means for moderately heating glass beads to be spread on the surface of a fusion type road zone line immediately before spreading. CONSTITUTION:After an application machine 1 is moved to a designated place to apply a zone line on a road by a slitter 2, glass beads are sent out from a glass bead tank 10, heated by a heating device 13 and spread on the upper surface of a coat through a spreader 5. At this time, a front wheel 3 and a roller in the spreader 5 are interlocked through a sprocket, a chain, a clutch and a connecting rod 6 to adjust the spread amount to be constant. Thus, the glass beads are sunk from the upper surface of a coat without quenching the upper surface of the coat, so that the glass beads are kept from separating from the coat so as to increase the visibility of a zone line during the night in the rain.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention involves implanting retroreflective glass beads on the surface of road marking coatings such as road markings using heat-melting paint to improve nighttime visibility. Regarding how to.

(Prior art) In order to improve visibility at night for road marking lines, which are often used today, glass beads with a retroreflective function are mixed into the paint, or they are sprinkled on the paint surface immediately after construction. ing. The purpose of mixing is to ensure visibility at night even if the coating surface is abraded due to vehicle traffic etc. after coating. (Even if the paint film wears away, the glass beads mixed in will appear on the surface.) However, in the early stages of coating, the glass beads are buried in the paint, so visibility at night cannot be expected. In order to compensate for this, glass beads are sprinkled on the surface of the paint film immediately after construction to provide nighttime visibility during the initial stage of the lot line application. However, since the glass beads are sprayed at room temperature, the amount of sinking of the glass beads from the coating film varies due to the influence of the viscosity of the paint at the time of spraying the glass beads, the particle size of the glass beads, etc. However, in practical terms, the temperature of the paint during glass bead scattering is approximately constant (the melting temperature of the paint is approximately 180" C).
), so there is little change in the viscosity of the paint, and it has been empirically found that the above-mentioned variation greatly affects the particle size of the glass beads. This is because when glass beads are dispersed, if the particle size of the glass beads is large, their heat capacity is also large, and when they come into contact with the coating surface, they absorb heat from the coating film, causing the coating surface to cool down rapidly.
Since it is cured, the amount of sinking is small and the glass beads are scattered in a floating state on the coating surface, resulting in the problem that the expected night visibility at the initial stage of application disappears early. Recently, glass beads with large particle diameters have been used to improve nighttime visibility, especially in rainy weather, but in this case, the above-mentioned problems are further exacerbated. Furthermore, when glass beads are sprayed at room temperature, the glass beads tend to become moist, and the glass beads tend to adhere to the grooves of the discarding roller that sprays them, resulting in a drawback that contributes to variations in the amount of spraying.

(Problems to be Solved by the Invention) As mentioned above, glass beads are sprinkled on the top surface of the paint film immediately after application in order to improve nighttime visibility in the initial stage of application for road marking lines, which are currently frequently used. Since it is sprayed at room temperature, the amount of sinking from the coating surface is greatly affected by the particle size.If glass beads with a large particle size, which are said to be effective in improving night visibility at the initial stage of coating, are sprayed, the amount of sinking from the coating surface will be significantly affected by the particle size. The problem is that night visibility at the initial stage of application quickly disappears. This problem is further aggravated when glass beads with larger particle sizes are sprayed at room temperature, which is said to be particularly effective in rainy weather. In addition, when spraying at room temperature,
The glass beads that are sprayed tend to become damp, and for the reasons mentioned above, there is also the drawback that the amount of sprayed beads varies widely.

(Means for solving the problem) In order to solve the above problem, since the conventional spraying method is carried out at room temperature, heat is removed from the coating surface during spraying, hardening the paint surface, and glass beads. Focusing on the fact that this prevents proper settling, we developed a method to heat the glass beads just before spraying and raise the temperature of the glass beads so that they can properly transfer heat to and from the coating surface. This solves the above-mentioned problem by allowing an appropriate amount of glass beads to sink below the top surface of the coating film when dispersing large-sized glass beads. Furthermore, moisture in the glass beads to be sprayed can be prevented by increasing the temperature, and variations in the amount of spraying can also be reduced.

(Example) Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side view of an embodiment of the present invention in which a glass bead heating device is attached to a conventional melt-type road marking line construction machine, and FIG. 2 is a plan view thereof.

Figure 3 is a model diagram showing the relationship between the coating surface and the glass beads during the conventional method of dispersing regular noodle glass beads, and Figure 4 is a model diagram when the glass beads of the present invention are heated. It is a diagram.

In FIGS. 1 and 2, 1 indicates the entire road marking line construction machine. 2 is a slitter for applying paint, 3 is a front wheel, 4 is a rear wheel, 5 is a glass bead spreader, 6 is a connecting rod connected to the rotation of the grooved roller 14, 7 is a front wheel 3 and a chain and A clutch box has a built-in clutch that connects the connecting rod 6 via a sprocket, 8 is a clutch lever 19 is an arm that interlocks with the clutch lever 8, 10 is a tank for storing glass beads,
11 is a handle, 12 is a hose for feeding glass beads from the glass bead tank 1o to the sprayer 5, and 13 is a heating device installed to heat the glass beads to be sprayed. In FIGS. 3 and 4, 5 indicates glass beads with a large particle size, 16 indicates glass beads with a small particle size, 17 indicates paint, and 18 indicates a road surface.

Next, the operation of the present invention will be explained.

First, the construction machine 1 is moved to a predetermined location, the slitter 2 is operated, and a marking line is applied to the road. Immediately after that, glass beads are sprayed onto the top surface of the coating film from the sprayer 5 through the lipose 9 in the glass bead tank 10. However, since the front wheel vehicle 3 and the roller 14 in the spreader 5 are interlocked via the sprocket, chain, clutch in the clutch box 7, and connect rod 6, the amount of spraying is determined by the amount of spraying per unit length of the lot line. is adjusted to remain constant. On the other hand, the glass beads to be scattered are heated by the heating bag N13 and are scattered on the top surface of the coating film via the sprayer 5.
Even when the temperature reaches the top surface of the coating, the temperature is close to that of the top surface of the coating film. Therefore, the top surface of the coating film is not rapidly cooled,
As shown in FIG. 4, the glass beads sink a considerable amount (approximately 1/2 to 2/3) below the top surface of the coating film. In addition, when the glass beads are not heated, as described above, the glass beads quickly cool and harden the film surface during dispersion, so that they sink only slightly as shown in FIG. 3. Here, if we compare the degree of peeling of the glass beads from the coating film 17, we can see that
In other words, it is easy to see that heating the glass beads causes them to peel apart. Furthermore, the heated glass beads have good adhesion to the coating surface, and can also be expected to have the effect of preventing the glass beads from peeling off. On the other hand, in terms of night visibility, even when glass beads are heated, glass beads are 1/3 to
Approximately 1/2 of the amount comes out from the coating film 17, so there is no big difference compared to the case in FIG. That is, by heating the glass beads and planting them in the coating film 17 immediately before dispersing them, it is possible to obtain a meltable road marking line that does not lose its function early and has high visibility at night. Furthermore, since moisture can be removed by heating the glass beads, the above-mentioned cause of variation in the amount of spraying can be prevented.

(Effects of the Invention) As explained above, in order to improve the night visibility of melted road marking lines, the following effects can be easily and simply obtained by heating the glass beads sprinkled on the upper surface appropriately just before spraying. It will be done.

(1) Adjust the amount of sinking of the glass beads to the coating surface by an appropriate amount (1
/2 to 2/3), and the visibility of road marking lines at night can be ensured.

(2) It is possible to remove the warm air from the glass beads, and a stable amount of spraying can be expected.

[Brief explanation of the drawing]

FIG. 1 is a side view of the entire road marking line construction machine of the present invention, and FIG. 2 is a plan view thereof. Figure 3 is a model diagram showing the relative position of the glass beads on the road surface and coating surface during glass bead dispersion at room temperature. 10 - Glass bead tank 12 - Hose 13 - Heating device 14 - Roller 15 - Glass beads with large particle size 16 - Glass beads with small particle size 17 - Paint film 18 - Road surface

Claims (1)

[Scope of Claims] In a method of implanting retroreflective glass beads on the surface of a road marking such as road markings using heat-melting paint, (1) Immediately after applying it to the road surface, a suitable amount of glass beads are placed on the top surface of the paint film. 1. A method for planting glass beads in a molten road marking line, which comprises scattering heated glass beads to plant them. (2) The method for planting glass beads according to claim 1, characterized in that the heating temperature is controlled depending on the particle size of the glass beads to be planted.