JP2018077379A - Shaping sheet for manufacturing retroreflection artificial leather sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shaping sheet for shaping a retroreflection artificial leather sheet using retroreflection, capable of reflecting light without using a particle.SOLUTION: A shaping sheet includes a base material layer (31) and a plurality of projections (32a) formed on one side of the base material layer. A projection has a triangular pyramid shape, with two of three faces intersecting at its apex at a right angle to each other, and enables formation of a corner cube shape.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a shaping sheet for shaping and molding an artificial leather sheet that reflects light by retroreflection.

  For the safety of pedestrians on the night road, there is artificial leather made of resin that reflects light when it hits and makes it easy to see. Such artificial leather usually exhibits retroreflective light reflection by dispersing transparent spherical particles such as glass beads in a transparent resin layer (for example, Patent Document 1).

Utility Model Registration No. 3198747

  However, as in the technique described in Patent Document 1, in the form in which the particles are dispersed, it is difficult to produce a product by sewing, or the particles are dropped and the performance is deteriorated.

  Therefore, in view of the above problems, the present invention has an object to provide a shaping sheet for shaping and producing a retroreflective artificial leather sheet using retroreflection capable of reflecting light without using particles. To do.

  The present invention will be described below. For ease of understanding, reference numerals in the drawings are appended here in parentheses, but the present invention is not limited to this.

  One form of the present invention is a shaped sheet (30) for producing a retroreflective artificial leather sheet (10) having a corner cube-shaped recess (12), which comprises a base material layer (31), a base layer A plurality of convex portions (32a) provided on one surface of the material layer, and the convex portions are triangular pyramids in which two of the three surfaces intersecting at the apex are perpendicular to each other. There is a shaped sheet for producing a retroreflective artificial leather sheet, which has a corner cube shape.

  According to the present invention, it is possible to easily produce a retroreflective artificial leather sheet using retroreflection that can reflect light without using particles.

1 is an external perspective view of a retroreflective artificial leather sheet 10. FIG. 1 is a plan view of a retroreflective artificial leather sheet 10. FIG. It is the figure which expanded a part of FIG. It is an external appearance perspective view of the retroreflective artificial leather sheet | seat 10 '. 2 is an external perspective view of a shaping sheet 30. FIG. FIG. 6A and FIG. 6B are diagrams for explaining a method for producing the retroreflective artificial leather sheet 10. FIG. 7A to FIG. 7C are views for explaining a method for producing the retroreflective artificial leather sheet 10 ′.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings. However, the present invention is not limited to these forms. In the drawings shown below, the size and ratio of members may be changed or exaggerated for easy understanding. In addition, for ease of viewing, illustrations of parts unnecessary for description and repetitive symbols may be omitted.

FIG. 1 is a perspective view showing a retroreflective artificial leather sheet 10 produced by a shaping sheet 30 according to one embodiment to be described later, and FIG. 2 shows a corner cube recess 12 in the retroreflective artificial leather sheet 10. FIG. 3 is an enlarged view of a part of FIG. 2.
As can be seen from FIG. 1 to FIG. 3, the retroreflective artificial leather sheet 10 has corner cube recesses 12 that are corner cube-shaped recesses that enable retroreflection with respect to the base 11 in the sheet surface direction (xy plane). A plurality of such elements are arranged in the direction along the line.

  The base 11 is a plate-like part that serves as a base material for forming the corner cube recess 12. The thickness of the base 11 is not particularly limited, but can be 25 μm or more and 200 μm or less. If the thickness is less than 25 μm, the sheet is easily torn, and if it is more than 200 μm, there is a possibility that the flexibility is applied and the usability is deteriorated.

  The corner cube concave portion 12 is a triangular pyramid-shaped concave portion in which two of the three surfaces intersecting at the apex thereof are perpendicular to each other, and is a concave portion having a so-called corner cube shape. Therefore, the light incident here is reflected toward the incident direction side by being reflected at least twice. This allows retroreflection.

  The base 11 for forming the corner cube recess 12 as described above only needs to be formed of a material that enables retroreflection when the above-described configuration is adopted. Examples thereof include urethane resin, polyvinyl chloride resin, polyamide resin (nylon), polyester resin, acrylic resin, polyolefin resin, and polyvinyl chloride.

According to such a retroreflective artificial leather sheet 10, by applying it to, for example, a part of shoes or clothes, the incident light is emitted to the light source side by retroreflection and is easily visible. Thereby, for example, it is possible to walk safely on a night road.
Since the retroreflective artificial leather sheet 10 does not use particles, the retroreflective artificial leather sheet 10 can be easily attached to the shoe or clothes by sewing, and the particles do not fall off, so that the light reflection performance is hardly lowered. Further, if the corner cube shape is formed by the concave portions as in the present embodiment, there is no protruding portion, so that wear and destruction are difficult to occur, and it can be said that the durability is excellent from this viewpoint.

  FIG. 4 is a perspective view showing another form of retroreflective artificial leather sheet 10 ′, and corresponds to FIG. 1. The retroreflective artificial leather sheet 10 ′ includes the base portion 11 in which the corner cube recess 12 is formed and the base material layer 22, and these are laminated.

The base material layer 22 is a layer laminated on the side of the base 11 opposite to the side on which the corner cube recess 12 is formed, and supports the base 11.
The base material layer 22 supports the base portion 11 and an appropriate material may be used depending on the use of the retroreflective artificial leather sheet 10 ′.
As the base material layer, natural fibers such as cotton, hemp, silk and wool, regenerated or semi-synthetic fibers such as rayon and acetate, synthetic fibers such as polyamide, polyester, polyacrylonitrile, polyvinyl alcohol and polyolefin, fibers such as glass fibers Woven fabrics, nonwoven fabrics, mesh fabrics (also called base fabrics), paper, resin films made of polyester or polyolefin resin, metal plates (or metal foils), glass plates, glass woven fabrics, etc. It can be appropriately selected from those used for base materials or base fabrics of synthetic leather or artificial leather according to the type and application of the resin leather.
Although it will not specifically limit if it is the thickness which can support the base 11 (resin skin layer) as a thickness of a base material layer, For example, it is found to set it as the range of 25 micrometers or more and 500 micrometers or less.

  The retroreflective artificial leather sheets 10 and 10 'as described above are arranged on the surfaces of various products and used as members that shine by reflected light. As a product, for example, it is used as a decoration material or a safety device for ensuring visual recognition when used for shoes, bags, clothes, and the like. It can also be used for surface materials such as sofas, chairs and vehicle seats, boxes, packaging containers, wall coverings such as wallpaper and flooring, and surface decoration materials for household appliances such as refrigerators and television receivers. .

  Next, of the retroreflective artificial leather sheets 10, 10 ', a shaping sheet for forming the corner cube recess 12 in the base 11 will be described. FIG. 5 is an external perspective view showing a part of the shaping sheet 30. As can be seen from FIG. 5, the shaping sheet 30 of this embodiment has a shaping layer 32 laminated on one surface of the shaping sheet substrate layer 31 and the shaping sheet substrate layer 31. Yes.

The shaping sheet base material layer 31 is a sheet-like member that supports the shaping layer 32 by laminating the shaping layer 32 on one surface. The material of the shaping sheet base layer 31 is not particularly limited as long as it can support the shaping layer 32. For example, paper (craft paper, fine paper), resin sheet, metal foil, woven fabric, Nonwoven fabrics and laminates of any of these can be mentioned.
The surface of the shaping sheet base material layer 31 preferably has an arithmetic average roughness Ra (JIS B0601 2001) of 0.1 nm or more and 30 nm or less. This is because when the Ra is larger than 30 nm, the unevenness of the surface roughness affects the shaping layer 32 and may inhibit the expression of diffraction gloss. Although Ra may be smaller than 0.1 nm, it is expensive to produce a substrate layer having a smaller Ra, while the effect is limited. More preferably, it is 0.5 nm or more and 20 nm or less from the viewpoint of achieving both cost and performance.

  Moreover, the thickness of the shaping sheet base material layer 31 is not particularly limited, but is preferably 25 μm or more and 200 μm or less. If the shaping sheet base material layer 31 is thicker than 200 μm, the cost increases while the improvement of the support effect is limited. On the other hand, if the shaping sheet base material layer 31 is thinner than 25 μm, the supportability may be insufficient when the retroreflective artificial leather sheets 10 and 10 ′ are manufactured.

The shaping layer 32 is a layer laminated on one surface of the shaping sheet base material layer 31, and is a portion formed by transferring the form of the corner cube recess 12 to the base 11. Therefore, the shaping layer 32 includes a plurality of convex portions 32 a having a shape obtained by inverting the concave shape of the corner cube concave portion 12. The convex portion 32a has a triangular pyramid shape in which two of the three surfaces intersecting at the apex thereof are perpendicular to each other.
The arrangement period of the convex portions 32a can be about 10 μm or more and 300 μm or less, and the height (thickness direction from the bottom to the top, that is, the distance in the z-axis direction in FIG. 6) can be about 5 μm or more and 150 μm or less.

  The material constituting the shaping layer 32 is not particularly limited as long as it can function as a shaping layer, but is an acrylic resin or a thermoplastic resin that is cured by ionizing radiation such as ultraviolet rays or electron beams. , Polyethylene resin, polypropylene resin, or polymethylpentene resin. Incidentally, as the ionizing radiation to be irradiated for curing, a form using ultraviolet rays in particular is called an ultraviolet curable resin, and a form using an electron beam in particular is called an electron beam curable resin. Of these, UV curable resins are preferred. Thereby, the moldability of the fine convex part 32a of the shaping layer 32 is good, and a shape can be obtained more reliably and accurately.

  Next, the process of producing the retroreflective artificial leather sheet 10 using the shaping sheet 30 will be described. FIGS. 6A and 6B are diagrams illustrating the process according to one example, and FIGS. 7A to 7C are diagrams illustrating the process according to another example. Each example will be described below. These drawings are diagrams schematically showing a cross section in the thickness direction (corresponding to the z-axis direction in FIGS. 1 to 5).

In the example shown in FIG. 6A and FIG. 6B, the composition constituting the base 11 is applied from the side on which the shaping layer 32 is formed in the shaping sheet 30 shown in FIG. Lamination is performed as shown in FIG. The application method is not particularly limited, and for example, a die coating method or the like can be applied. Thus, the shape of the corner cube recess 12 is obtained.
Thereafter, the shape of the corner cube recess 12 in the base 11 is determined by an appropriate curing method such as heat drying, and the retroreflective artificial leather sheet 10 is released from the shaping sheet 30 as shown in FIG. . Thereby, the retroreflective artificial leather sheet which consists only of the base 11 in which the corner cube recessed part 12 was formed can be obtained.

On the other hand, in the example shown in FIGS. 7 (a) to 7 (c), the composition constituting the base 11 is applied from the side on which the convex portions 32a of the shaping sheet 30 shown in FIG. Lamination is performed as shown in FIG. The application method is not particularly limited, and for example, a die coating method or the like can be applied. Thereby, the base 11 has the shape of the corner cube recess 12. Thereafter, the shape of the corner cube concave portion 12 is determined in the base 11 by an appropriate curing method such as heat drying.
Next, as shown in FIG.7 (b), the base material layer 22 is bonded together to the surface on the opposite side to the side which contacted the shaping sheet | seat 30 among the base parts 11. FIG.
Thereafter, as shown in FIG. 7C, the laminated body of the base portion 11 and the base material layer 22 in which the corner cube concave portion 12 is formed is released from the shaping sheet 30. As a result, a retroreflective artificial leather sheet 10 ′ composed of the base 11 having the corner cube recess 12 and the base material layer 22 can be obtained.

  As described above, a retroreflective artificial leather sheet can be easily produced.

DESCRIPTION OF SYMBOLS 10 Retroreflective artificial leather sheet 11 Base 12 Corner cube recessed part 22 Base material layer 30 Molding sheet 31 Molding sheet base material layer 32 Molding layer 32a Convex part

Claims (1)

A shaping sheet for producing a retroreflective artificial leather sheet having a corner cube-shaped recess,
A base layer, and a plurality of convex portions provided on one surface of the base layer,
The convex portion has a triangular pyramid shape in which two of the three surfaces intersecting at the apex thereof are perpendicular to each other, and has a shape capable of forming the corner cube shape, for producing a retroreflective artificial leather sheet Molding sheet.

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