Retroreflective weed-proof sheet and method for manufacturing the same

Abstract

To provide a retroreflective weed-proof sheet in which the position of a curb is easily visually recognized at night.SOLUTION: A retroreflective weed-proof sheet is laid at a boundary between a roadway or a sidewalk and a curb. The retroreflective weed-proof sheet is formed by laminating and integrating a glass bead 2 embedded in a transparent resin layer 1, an aluminum layer 3, a nonwoven fabric layer 4, and an asphalt layer 5 in this order from the surface. Due to the glass beads 2 and the aluminum layer 3 embedded in the transparent resin layer 1, when the headlight of a vehicle is applied at night, the color of the surface is visually recognized as silver gray, so that the position of the curb can be confirmed. The aluminum layer 3 and the nonwoven fabric layer 4 are formed of an aluminum-deposited nonwoven fabric.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a retroreflective weed-control sheet to be laid at the boundary between a paved road or the like and a curb, and a method for producing the same. [Background technology]

[0002] Conventionally, weed-control sheets have been laid at the boundaries between paved roadways and curbs, and between sidewalks and curbs (Patent Document 1). These boundaries have gaps, and this is done to prevent weeds from growing through these gaps. Asphalt sheets, which are nonwoven fabrics impregnated with asphalt, are used as weed-control sheets.

[0003] Because the surface of such weed-control sheets is black, it is difficult to see the position of curbs at night, and vehicles traveling on paved roads often hit the curbs or run up onto the sidewalk.

[0004] [Patent Document 1] JP 2008-69527 A DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a weed control sheet that makes it easy to see the position of a curb at night. [Means for solving the problem]

[0006] The present invention solves the above problems by using a weed control sheet having a specific configuration. That is, the present invention relates to a retroreflective weed control sheet to be laid at the boundary between a roadway or sidewalk and a curb, the weed control sheet being formed by laminating glass beads embedded in a transparent resin layer, an aluminum layer, a nonwoven fabric layer and an asphalt layer in this order from the surface, and a method for manufacturing the same.

[0007] The retroreflective weed control sheet according to the present invention is formed by laminating and integrating glass beads 2 embedded in a transparent resin layer 1, an aluminum layer 3, a nonwoven fabric layer 4, and an asphalt layer 5 in this order. The transparent resin layer 1 is formed of a conventionally known resin, and is preferably formed of an acrylic resin having excellent transparency. The glass beads 2 are embedded in the transparent resin layer 1. For example, as shown in FIG. 1, the glass beads 2 may be embedded in a state where some of them are protruding above the transparent resin layer 1, or the glass beads 2 may be completely embedded in the transparent resin layer 1. The particle size of the glass beads 2 is generally about 0.1 to 0.8 mm. As shown in FIG. 1, the glass beads 2 are sparsely embedded. Specifically, the number of glass beads 2 is 50 to 200 / cm. 2 Density of about 50~250g / m 2 Because they are embedded sparsely, when hit by vehicle headlights at night, the color of the retroreflected light and the color of the aluminum layer 3 mix and are visually recognized as silver-gray. A transparent protective layer may be provided on the surfaces of the transparent resin layer 1 and the glass beads 2.

[0008] The aluminum layer 3 may be formed of aluminum foil or aluminum-vapor-deposited synthetic resin film, but is preferably formed of aluminum-vapor-deposited nonwoven fabric. Aluminum-vapor-deposited nonwoven fabric is a nonwoven fabric that has been subjected to aluminum vapor deposition, and the aluminum layer 3 and nonwoven fabric layer 4 can be formed simultaneously. When aluminum-vapor-deposited nonwoven fabric is not used, other materials such as synthetic resin film may be present between the aluminum layer 3 and nonwoven fabric layer 4. Any material may also be present between the nonwoven fabric layer 4 and the asphalt layer 5.

[0009] The nonwoven fabric used for the aluminum vapor-deposited nonwoven fabric is preferably one with a smooth surface so that aluminum can be vapor-deposited easily. Specifically, it is preferable to use a long-fiber nonwoven fabric (a so-called spunbond nonwoven fabric) composed of long fibers with a flat cross section. The degree of flatness is preferably such that the ratio of the major axis to the minor axis is 5 or more. The basis weight of the nonwoven fabric is 50 to 100 g / m 2A long-fiber nonwoven fabric made of long fibers with a flat cross section and with this level of basis weight has few voids penetrating from the front to the back, making it difficult for the roots and stems of weeds to penetrate, making it suitable for use as a weed control sheet.

[0010] The asphalt layer 5 is formed of an asphalt sheet mainly made of asphalt such as petroleum asphalt, natural asphalt, or modified asphalt. 2 Asphalt is applied at 0.8 to 2.5 kg / m to the needle punched nonwoven fabric. 2 The asphalt sheet is obtained by impregnating the asphalt sheet with the nonwoven fabric. Since the surface of the asphalt sheet is adhesive, this adhesive property can be utilized to attach the asphalt sheet to the nonwoven fabric to form the asphalt layer 5. In particular, if the surface of the asphalt sheet is heated with a heating burner or the like to soften or melt the asphalt and attach it to the back surface of the nonwoven fabric, the asphalt layer 5 that is firmly laminated and integrated with the nonwoven fabric layer 4 can be obtained. Since the back surface of the asphalt sheet is also adhesive, release paper or the like may be laminated thereon to make it easier to handle.

[0011] The following method is a preferred method for producing the retroreflective weed control sheet according to the present invention. First, a nonwoven fabric with aluminum vapor deposition on its surface is prepared. A transparent solution in which an acrylic resin is dissolved in a solvent is applied to the aluminum vapor deposition surface of this nonwoven fabric. After the transparent solution is applied, and before the solvent volatilizes and the acrylic resin solidifies, glass beads are scattered on the surface of the acrylic resin and pressed into the acrylic resin with a pressure roller or the like. The amount of glass beads scattered is 50 to 200 pieces / cm so that the glass beads are sparse. 2 Or 50~250g / m 2 The degree of pressing is optional, but it is preferable that some of the glass beads are protruding from the surface of the acrylic resin. In this method, the nonwoven fabric is a long-fiber nonwoven fabric (with a basis weight of 50 to 100 g / m2) made of long fibers with a flat cross section. 2It is preferable to use a long fiber nonwoven fabric having a thickness of about 1 / 100 mm. This is because such a long fiber nonwoven fabric has few voids penetrating from the front to the back, and can prevent the transparent solution in which the acrylic resin is dissolved in a solvent or the acrylic resin from seeping out to the back of the nonwoven fabric. Thereafter, the surface of a separately prepared asphalt sheet is heated to soften or melt it, and the asphalt sheet is attached to the back of the aluminum-deposited nonwoven fabric (the side not vapor-deposited with aluminum). A protective layer made of a transparent synthetic resin film or the like may be laminated on the surface of the acrylic resin and glass beads. Also, release paper or the like may be laminated on the back of the asphalt sheet (the side opposite to the side attached to the nonwoven fabric) for ease of handling. By the above method, a retroreflective weed control sheet is obtained.

[0012] The retroreflective weed control sheet according to the present invention is used by being laid at the boundary between a paved roadway and a curbstone, or between a paved sidewalk and a curbstone, etc. When laying it, if the back surface of the asphalt layer 5 (the surface opposite to the surface in contact with the nonwoven fabric layer 4) is heated with a heating burner or the like to adhere it to the paved roadway, curbstone, or paved sidewalk, adhesion durability is improved. Effect of the Invention

[0013] The retroreflective weed control sheet of the present invention, which is laid at the boundary between a roadway or sidewalk and a curb, is visible as a silver-gray sheet by vehicle headlights at night, allowing the position of the curb to be confirmed, thus preventing vehicles from hitting the curb or running onto the sidewalk. Furthermore, the retroreflective weed control sheet of the present invention does not absorb sunlight during the day, but reflects it well through retroreflection, etc., preventing the asphalt layer provided on the retroreflective weed control sheet from softening and flowing or from deteriorating. This also provides the effect of preventing weeds from growing over a long period of time. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a schematic diagram showing an example of a side surface of a retroreflective weed control sheet according to the present invention. [Explanation of symbols]

[0015] 1 Transparent resin layer 2. Glass beads 3 Aluminum Layer 4 non-woven layer 5 Asphalt layer

Claims

1. Weed control sheets to be laid on the boundary between a roadway or sidewalk and a curb, The weed-control sheet is a retroreflective weed-control sheet which is formed by laminating and integrating, from the surface, glass beads embedded in a transparent resin layer, an aluminum layer, a nonwoven fabric layer, and an asphalt layer in that order.

2. 2. The retroreflective weed-control sheet according to claim 1, wherein the surface color is visually recognized as silver-gray due to the glass beads embedded in the transparent resin layer and the aluminum layer.

3. 2. The weed-control sheet according to claim 1, wherein the aluminum layer and the nonwoven fabric layer are made of a nonwoven fabric that has been subjected to aluminum vapor deposition.

4. 2. The weed control sheet according to claim 1, wherein the transparent resin layer is made of an acrylic resin.

5. A step of applying a transparent solution obtained by dissolving an acrylic resin in a solvent to the aluminum-deposited surface of a nonwoven fabric having an aluminum-deposited surface; After application, before the acrylic resin solidifies, glass beads are scattered on the surface of the acrylic resin, and the glass beads are pressed into the acrylic resin; A method for producing a retroreflective weed control sheet, comprising the steps of heating the surface of an asphalt sheet to soften or melt it, and attaching it to the back surface of the nonwoven fabric.

6. 6. The method for producing a retroreflective weed-control sheet according to claim 5, wherein the nonwoven fabric is a long-fiber nonwoven fabric composed of long fibers having a flat cross section.

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