JPH0440163Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a soft reflective sheet.

As shown in FIG. 8, the surface incidence plane a ₁ of a flexible thermoplastic resin film a such as vinyl chloride
When using a microprism type retroreflective material A having a pyramid-shaped convex portion b on the back surface of the reflective material A, if water adheres to the back surface of the reflective material A, the reflective function of the prism will be lost.

Therefore, in normal use, Figures 9 and 10
As shown in the figure, a plastic film B is layered on the back surface of the reflective material A, and the outer edges of both A and B are welded C to ensure watertightness on the back surface of the reflective material A, and the reflective sheet S A method of constructing a reflector and adhering it to an object that requires a reflective material was proposed.

However, the conventional reflective sheet S has a diameter of 10 mm.
When wrapped around a cylinder D or rod-shaped body with a relatively small diameter of cm or less, there is a difference in diameter that is twice the thickness of the plastic film between the wrapped diameter of the reflective material A and the plastic film B on the back side. Therefore, since a tensile force P acts on both ends of the reflective material A as shown in FIG. 11, the outer end S' of the reflective sheet S curls up as shown in FIG. 12, making it susceptible to mechanical damage. However, it is easy to peel off from this end. Note that S'' in the figure is the inner end of the reflective sheet S.

The present invention was proposed to solve these problems, and is a micro-prism-type reflex reflector in which a large number of pyramidal convex portions are provided on the back side of the front surface of a flexible thermoplastic resin film. A plastic film is layered on the back side of the reflective material, and the outer peripheral edges of the two are welded, and the plastic film extends in the width direction at intervals of approximately 5 mm between the two, and both ends are connected to the outer peripheral welded portion. This invention relates to a soft reflective sheet characterized by being provided with striped welded parts with a width of about 1 mm.

The present invention will be described below with reference to the illustrated embodiments.

1 is a micro-prism type retroreflective material in which a large number of pyramid-shaped convex portions are provided on the back side of the surface incident surface of a flexible thermoplastic resin film such as vinyl chloride. A plastic film 2 such as vinyl film is overlaid on the first film.
As shown in the figure, the reflective material 1 and the plastic film 2 are welded to a width of approximately 1 mm at intervals of approximately 5 mm, and the outer peripheral edges of the reflective material 1 and the plastic film 2 are welded, and both ends of the horizontal striped welded portion 4 are connected to the outer peripheral welded portion 3. The reflective sheet 5 is constructed by welding and sealing the reflective sheet 5.

When the reflective sheet 5 constructed as described above is wrapped around the cylindrical body 6, it is wound like a gear as shown in FIG. 4, so that the lifting phenomenon of the ends of the reflective sheet 5 is eliminated.

In this case, a welded part 3' is formed inside the outer peripheral edge welded part 3, parallel to the same part and orthogonal to the horizontal striped welded part 4, and cut at the same part 3' as necessary to form a reflective sheet. It is also effective to narrow the width of 5 and use it.

At this time, as shown in FIG. 6, an unwelded portion 7 may be left on the outer periphery of the horizontally striped welded portion 4.
Alternatively, as shown in FIG.
If the outer periphery welds 3 at both ends are not connected, the above-mentioned displacement phenomenon will occur between the reflective material 1 on the front surface of the sheet and the plastic film 2 on the back surface on both sides of the reflective sheet, causing tension. Since the force P acts, it not only reduces the effect of the horizontal striped welds 4 by half, but also moves the reflective sheet to
- When cut along the X-rays, when used in the rain, water will enter the non-welded parts and the reflective function will be lost in the outer periphery in the case of Figure 6 and the entire surface in the case of Figure 7. .

Therefore, it is necessary that the outer periphery welded portion 3 and the horizontally striped welded portion 4 be completely connected.

As described above, in the reflective sheet according to the present invention, a plastic film is placed on the back side of a microprism type retroreflective material in which a large number of pyramidal convex portions are provided on the back side of the surface incident surface of a flexible thermoplastic resin film. and welding the outer peripheries of both the film and the reflective material, and striped welded parts extending in the width direction at predetermined intervals between the two and having both ends connected to the outer periphery welded parts. Therefore, when the reflective sheet of the present invention is wrapped around a cylindrical body, the sheet is wrapped like a gear,
This prevents the sheet edge from lifting up.

Furthermore, when the reflective sheet of the present invention is cut parallel to the striped welds, both ends of the striped welds are connected to the outer peripheral weld, so there is a gap between the reflective material and the plastic film. There is no need to worry about rainwater entering the area and damaging the reflective function.
The invention has many advantages.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the soft reflective sheet according to the present invention, Figs. 2 and 3 are views taken in the direction of the arrows in Fig. 1, and Fig. 4 are views in the direction of the arrows, respectively, and Fig. 4 shows its use. FIG. 5 is a plan view showing another embodiment of the present invention; FIGS. 6 and 7 are plan views showing respective reflective sheets as comparative examples of the present invention; FIG. 8 is a longitudinal sectional view showing the state; is a partially enlarged slope view of a microprism type retroreflective material, Figures 9 and 10 are vertical side views, and plan views of a conventional reflective sheet, and Figure 11 is a diagram of a conventional reflective sheet wrapped around it. FIG. 12, which is an explanatory diagram showing the stress state, is a longitudinal sectional view showing the state when a conventional reflective sheet is wrapped around a cylindrical body. 1...Micro prism type retroreflective material, 2...
...Plastic film 3...Outer periphery welded part, 4
...Horizontal striped welds.

Claims (1)

[Scope of utility model registration request] A plastic film is layered on the back side of a microprism type retroreflective material in which a large number of pyramidal convex portions are provided on the back side of the surface incident surface of a flexible thermoplastic resin film, and the outer peripheral edges of the two are welded. At the same time, striped welded portions having a width of about 1 mm are provided between the two at intervals of about 5 mm, extending in the width direction and having both ends connected to the outer peripheral welded portion. .