Reflective member

Abstract

To provide a reflective member capable of suppressing deterioration of reflection performance and fluorescent performance..SOLUTION: A reflective member 10 is provided, comprising a reflective sheet 100 comprising a phosphor and acrylic resin, and a coating layer 200 containing a translucent material having a bending strength that is lower than that of the reflective sheet 100 at 25°C, the coating layer being configured to cover top, bottom, and side surfaces of the reflective sheet 100 and to be at least partially in close contact with the reflective sheet 100.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a reflecting member. [Background technology]

[0002] At railway crossing gates managed by railway operators and traffic crossing gates managed by expressway operators, hanging belts are installed to improve visibility day and night and to alert vehicles and pedestrians.

[0003] Patent Document 1 describes a strip-shaped base material in which two layers, a colored resin layer and a transparent resin layer, are integrally molded. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-169009 Summary of the Invention [Problem to be solved by the invention]

[0005] Reflective members used in hanging belts and the like are preferably flexible and contain a fluorescent material for the purpose of improving visibility. However, when a fluorescent material is contained in a reflective member, degradation of the fluorescent material over time may become a problem. One example of the problem to be solved by the present invention is to provide a reflective member that is flexible and can suppress degradation of performance over time. [Means for solving the problem]

[0006] According to the present invention, the following reflecting member is provided. [1] a reflective sheet containing a phosphor and an acrylic resin; a covering layer including a material having a lower bending strength at 25°C than the reflecting sheet and having light transmittance, the covering layer covering the reflecting sheet and at least a portion of which is fixed to the reflecting sheet; A reflective member having [2] Used outdoors, [1] The reflective member according to [1]. [3] It is used by hanging it from a barrier bar to restrict the passage of moving objects. [2] The reflective member according to [2]. [4] The material includes polyvinyl chloride. A reflective member according to any one of [1] to [3]. [5] The thickness of the coating layer on the main surface of the reflecting sheet is 0.04 mm or more and 0.09 mm or less. A reflective member according to any one of [1] to [4]. [6] The thickness of the coating layer on the side surface of the reflecting sheet is 0.03 mm or more and 0.04 mm or less. A reflective member according to any one of [1] to [5]. [7] The longitudinal length is between 15cm and 80cm, The length of the short side is 1.5 cm or more and 4 cm or less, A reflective member according to any one of [1] to [6]. [8] The weight per unit area is 0.15g / cm 2 That's all. A reflective member according to any one of [1] to [7]. [9] The reflective sheet and the material that will become the covering layer are formed by extrusion molding at the same time. A reflective member according to any one of [1] to [8]. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a reflective member that has flexibility and is capable of suppressing deterioration of performance over time. [Brief explanation of the drawings]

[0008] [Figure 1] 10A and 10B are diagrams illustrating an example of use of the reflective member according to the present embodiment. [Figure 2] FIG. 2 is a perspective view of a reflecting member according to the embodiment. [Figure 3] 10A and 10B are diagrams showing an example of how to attach the reflective member according to the present embodiment to the barrier bar. [Figure 4] FIG. 2 is a schematic diagram of a cross section of a reflecting sheet according to the present embodiment. [Figure 5] 5A to 5C are cross-sectional views illustrating a manufacturing process of the reflective member according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, like components are designated by like reference numerals, and the description thereof will be omitted as appropriate.

[0010] FIG. 1 shows an example of how the reflective member 10 of this embodiment is used. The reflective member 10 is attached to a barrier bar for restricting the passage of outdoor moving objects, and used as a hanging belt. The barrier bar for restricting the passage of moving objects is, for example, a barrier bar 20 used at railroad crossings or intersections, as shown in FIG. 1, and has, for example, a wire 21. The reflective member 10 is attached by being suspended from the wire 21. The reflective member 10 has fluorescent properties, which will be described later, and thus, by attaching the reflective member 10, the visibility of the barrier bar 20 is improved.

[0011] FIG. 2 is a perspective view of the reflective member 10 according to this embodiment. The reflective member 10 has a structure in which a reflective sheet 100 is covered with a coating layer 200. As shown in FIG. 2, the reflective member 10 has a plate-like shape. The width W1 of the reflective member 10 is, for example, 1.5 cm or more and 4 cm or less. The length W2 of the reflective member 10 is, for example, 15 cm or more and 80 cm or less. The thickness W3 of the reflective member 10 is, for example, 0.15 mm or more and 0.24 mm or less. The thickness T of the coating layer 200 on the main surface (top surface in FIG. 2) of the reflective sheet 100 is, for example, 0.04 mm or more and 0.09 mm or less. The thickness T' of the coating layer 200 on the side surface of the reflective sheet 100 is, for example, 0.03 mm or more and 0.04 mm or less. The width W1' of the reflective sheet 100 is, for example, 1.4 cm or more and 3.9 cm or less. The length W2' of the reflective sheet 100 is, for example, not less than 10 cm and not more than 75 cm. The thickness W3' of the reflective sheet 100 is, for example, not less than 0.05 mm and not more than 0.14 mm. The main surface of the reflective sheet 100 is the surface of the reflective sheet 100 that has the main reflective function. The reflectivity of the reflective sheet 100 may be retroreflective, in other words, the reflective sheet 100 may be a retroreflective sheet.

[0012] The weight per unit area of ​​the reflecting member 10 is 0.15 g / cm 2 It is preferable that the concentration is 0.18 g / cm or more. 2 More preferably, it is 0.20 g / cm or more. 2 It is more preferable that the above be the case. This makes it possible to prevent the reflecting member 10 from being wrapped around the barrier bar 20 due to being blown by the wind, for example.

[0013] 2, the reflective member 10 preferably includes a covering region 210 that does not include the reflective sheet 100 at its longitudinal end. In other words, it is preferable that the length of the covering layer 200 is somewhat longer than the length W2' of the reflective sheet 100, and that the covering region 210 is formed at the end of the covering layer 200. It is also preferable that a through hole 210a is formed in the covering region 210, and that a reinforcing member, for example, a reinforcing metal fitting (not shown) is attached to the inner surface of the covering region 210. This makes it easier to attach the reflective member 10 to the barrier rod 20, which will be described later.

[0014] 3 is a diagram showing an example of how to attach the reflecting member 10 according to this embodiment to the barrier bar 20, as viewed from the longitudinal direction of the barrier bar 20. For example, with the attachment 30 hung on the wire 21, the reflecting member 10 can be attached by inserting a part of the attachment 30 into the through-hole 210a of the reflecting member 10.

[0015] Next, each component of the reflecting member 10 will be described in detail.

[0016] [Reflective Sheet 100] FIG. 4 is a schematic diagram of a portion of a cross section of the reflective sheet 100. The reflective sheet 100 has a structure in which two single-sided reflective sheets 110, each including an adhesive layer 101, a resin layer 102, an air layer 103, a prism layer 104, and a top layer 105, are arranged with the adhesive layers 101 facing each other. Note that the schematic diagram shown in FIG. 4 is an example, and the structure of the reflective sheet 100 is not limited to this. For example, the reflective sheet 100 may be a single single-sided reflective sheet 110, in which case the single-sided reflective sheet 110 does not need to include the adhesive layer 101.

[0017] [Adhesive layer 101] The adhesive layer 101 bonds the resin layers 102 of the two single-sided reflective sheets 110 together. The adhesive layer 101 is made of, for example, a rubber-based pressure-sensitive adhesive using a rubber-based polymer such as natural rubber, polyisobutylene rubber, styrene-butadiene rubber, styrene-isoprene-styrene block copolymer rubber, recycled rubber, butyl rubber, polyisobutylene rubber, or NBR as the base polymer, a silicone-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, or an acrylic-based pressure-sensitive adhesive. The thickness T1 of the adhesive layer 101 is, for example, 70 μm or more and 90 μm or less.

[0018] [Resin layer 102] The resin layer 102 supports the prism layer 104 and the top layer 105. The resin layer 102 also has support portions 102a that partially protrude from one surface of the resin layer 102, and these support the prism layer 104, thereby forming an air layer 103 between the resin layer 102 and the prism layer 104. The resin layer 102 can be made of polyester, such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, or polybutylene naphthalate.

[0019] [Prism layer 104] The prism layer 104 reflects incident light at the interface with the air layer 103. As shown in Fig. 4, a large number of reflective surfaces facing different directions are formed at the interface between the prism layer 104 and the air layer 103, which gives the reflective sheet 100 retroreflectivity, in which incident light is reflected back toward the light source.

[0020] [Top Tier 105] The top layer 105 is formed to cover the prism layer 104, thereby protecting the prism layer 104 from the outside. It also improves the sealing of the air layer 103. Furthermore, the top layer 105 preferably contains a phosphor, for example, a fluorescent material. This causes the reflected light to be color-converted both when it is incident and when it is reflected from the prism layer 104. The top layer 105 preferably contains an acrylic resin in order to suppress deterioration of the fluorescent performance.

[0021] [Coating layer 200] The covering layer 200 is configured to cover the upper surface (one example of a main surface), the lower surface (another example of a main surface), and the side surfaces of the reflecting sheet 100. As described above, the top layer 105 preferably contains an acrylic resin from the viewpoint of suppressing deterioration of fluorescent performance, but acrylic resin is easily deteriorated by high temperatures and high humidity. The reflecting member 10 according to this embodiment can improve heat resistance and water resistance by covering the reflecting sheet 100 with the covering layer 200. Furthermore, the covering layer 200 preferably has light-transmitting properties and preferably contains a light-transmitting material. The covering layer 200 preferably contains a thermoplastic resin composition containing a resin such as polyamide, polyimide, polyester, tetrafluoroethylene, polyvinylidene chloride, or polyvinyl chloride. Among these, it is particularly preferable that the covering layer 200 contains polyvinyl chloride. Note that having light-transmitting properties means, for example, that the transmittance of visible light having a wavelength of 360 nm or more and 830 nm or less is 90% or more.

[0022] Furthermore, it is preferable that at least a portion of the covering layer 200 is fixed to the reflecting sheet 100, and it is preferable that 90% or more of the surface of the covering layer 200 that contacts the reflecting sheet 100 is fixed to the reflecting sheet 100, and it is more preferable that substantially the entire surface of the covering layer 200 that contacts the reflecting sheet 100 is fixed to the reflecting sheet 100. In other words, it is preferable that no gap is formed between the covering layer 200 and the reflecting sheet 100. This makes it possible to prevent liquids such as water from entering between the covering layer 200 and the reflecting sheet 100, for example, if a crack occurs in a part of the covering layer 200. Furthermore, when the covering layer 200 is in close contact with the reflecting sheet 100, the mechanical strength of the top layer 105 of the reflecting sheet 100 is improved.

[0023] Furthermore, the light-transmitting material of the covering layer 200 preferably has a bending strength measured in accordance with JIS K 6911 at 25°C lower than that of the reflecting sheet 100 when the material has the same dimensions as the reflecting sheet 100. The light-transmitting material of the covering layer 200 preferably has a bending strength measured in accordance with JIS K 6911 at 25°C of, for example, 50 MPa or more and 120 MPa or less. In this way, a decrease in the flexibility of the reflecting member 10 due to the covering layer 200 can be suppressed.

[0024] [Method of manufacturing the reflective member 10] Next, a method for manufacturing the reflective member 10 will be described. Fig. 5 is a cross-sectional view of the steps as viewed from the short side direction (z direction in Fig. 2) of the reflective member 10. The method for manufacturing the reflective member 10 includes, for example, a preparation step of preparing two single-sided reflective sheets 110, an adhesion step of joining the single-sided reflective sheets 110 to form the reflective sheet 100, and a covering layer formation step of forming a covering layer 200 so as to cover the reflective sheet 100.

[0025] For example, a commercially available retroreflective sheet can be used as the single-sided reflective sheet 110 in the preparation step. For example, a retroreflective sheet manufactured by Nippon Carbide Industries Co., Ltd., cut into any size, can be used.

[0026] The bonding step can be performed, for example, by bonding the adhesive layers 101 of two single-sided reflective sheets 110 face to face. When the above-mentioned retroreflective sheet manufactured by Nippon Carbide Industries Co., Ltd. is used as the single-sided reflective sheet 110, the release films of the two retroreflective sheets are peeled off, and then the adhesive layers of the retroreflective sheets are bonded face to face to form the reflective sheet 100.

[0027] The coating layer forming step is performed, for example, by simultaneously extruding the materials that form the reflective sheet 100 and the coating layer 200. When polyvinyl chloride is used as the material that forms the coating layer 200, it is preferable to extrude the material at a temperature of, for example, 180°C or higher and 190°C or lower. It is also preferable that the coating layer 200 be quickly cooled by water cooling or the like after extrusion. This prevents the acrylic resin contained in the top layer 105 from melting and deteriorating the properties of the top layer 105. Note that the method for forming the coating layer 200 is not limited to this, and other methods such as transfer molding and compression molding may also be used.

[0028] As described above, the reflective member 10 according to this embodiment can suppress deterioration of fluorescent performance and the like by being covered with the coating layer 200. Furthermore, the reflective member 10 according to this embodiment also has excellent flexibility because the bending strength of the coating layer 200 is lower than the bending strength of the reflective sheet 100.

[0029] Although the embodiments of the present invention have been described above with reference to the drawings, these are merely examples of the present invention, and various other configurations can also be adopted. [Example]

[0030] The present invention will be described in detail below with reference to examples, but the present invention is not limited to the descriptions of these examples.

[0031] First, the reflecting member 10 according to the example was manufactured according to the following procedure. 1. Prepare two pieces of retroreflective sheeting (manufactured by Nippon Carbide Industries Co., Ltd., UXC series, 23 mm wide slit) cut into approximately 25 mm x 400 mm pieces. 2. The release film is removed from the retroreflective sheeting, and the adhesive layer is joined to form the reflective sheeting 100. 3. The reflective sheet 100 is compression molded simultaneously with polyvinyl chloride to form a covering layer 200 made of polyvinyl chloride on the reflective sheet 100.

[0032] The details of the manufactured reflecting member 10 are as follows. Dimensions: 25mm x 400mm ·Density: 0.15g / cm 2 End Thickness: Approx. 0.2mm

[0033] [evaluation] The following evaluation tests were conducted on the reflective members 10 according to the examples and comparative examples. The results of the evaluation tests are shown in Table 1. As a comparative example, a retroreflective sheet (UXC series, 23 mm wide slit, manufactured by Nippon Carbide Industries Co., Ltd.) was used as is. The following evaluation tests were also conducted on the reflective members 10 after the exposure test in accordance with JIS K 7350-4 to evaluate the influence of the exposure test on the reflective member 10. The exposure tests were conducted for exposure periods of 250 hours, 500 hours, 750 hours, and 1000 hours.

[0034] <Reflection performance test> The reflection performance test was carried out in accordance with JIS-Z-9117 as follows. First, light was emitted from a light source onto the reflective member 10 at an incident angle of 5°, and the illuminance Es of the incident light was measured. Next, the illuminance Er of the reflected light was measured at an observation angle of 12°. The retroreflection coefficient [cd / (lx m 2 The calculated retroreflection coefficients are shown in Table 1.

[0035] <Fluorescence performance test> The irradiated light and reflected light were observed by fluorometry to measure the fluorescence excitation degree for the reflecting member 10. The values ​​shown in Table 1 indicate that the higher the value, the higher the fluorescence excitation degree.

[0036] [Table 1]

[0037] First, before light irradiation, the reflective performance of the Example was approximately 1.35 times that of the Comparative Example. Furthermore, after 1000 hours of irradiation, the reflective performance of the Comparative Example deteriorated to approximately 60% of the pre-irradiation level, whereas the reflective performance of the Example did not deteriorate even after 1000 hours of irradiation. Next, before light irradiation, the fluorescent performance of the Example was approximately 1.2 times that of the Comparative Example. Furthermore, after 1000 hours of irradiation, the fluorescent performance of the Comparative Example deteriorated to approximately 0.7% of the pre-irradiation level, whereas the fluorescent performance of the Example showed almost no deterioration even after 1000 hours of irradiation.

[0038] As described above, it has been confirmed that the reflecting member 10 according to the present invention can suppress deterioration of the reflecting performance and fluorescent performance. [Explanation of symbols]

[0039] 10 Reflective member 20 Barrier 21 Wire 100 Reflective Sheet 110 Single-sided reflective sheet 101 Adhesive layer 102 Resin layer 103 Air Layer 104 Prismatic Layer 105 Top Tier 200 coating layer 210 Covered Area 210a through hole

Claims

1. a reflective sheet containing a phosphor and an acrylic resin; a covering layer including a material having a lower bending strength at 25°C than the reflecting sheet and having light transmittance, the covering layer covering the reflecting sheet and at least a portion of which is fixed to the reflecting sheet; A reflective member having

2. Used outdoors, The reflector according to claim 1 .

3. It is used by hanging it from a barrier bar to restrict the passage of moving objects. The reflector according to claim 2 .

4. The material includes polyvinyl chloride. The reflector according to claim 1 .

5. The thickness of the coating layer on the main surface of the reflecting sheet is 0.04 mm or more and 0.09 mm or less. The reflector according to claim 1 .

6. The thickness of the coating layer on the side surface of the reflecting sheet is 0.03 mm or more and 0.04 mm or less. The reflector according to claim 1 .

7. The length in the longitudinal direction is 15 cm or more and 80 cm or less, The length in the short direction is 1.5 cm or more and 4 cm or less. The reflector according to claim 1 .

8. The weight per unit area is 0.15 g / cm ２ That's all. The reflector according to claim 1 .

9. The reflective sheet and the material are formed by extrusion molding at the same time. The reflector according to claim 1 .

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