JPH11277984A - Film for white board which works as projection screen as well - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the gloss by a method wherein the surface of a white synthetic resin film is made into a fine uneven surface and at the same time, a hardened hard coat layer is coated on the fine uneven surface. SOLUTION: An uneven surface 20 is formed in such a manner that a coating layer of which the minimum thickness is approx. 10 μm containing a silica fine grain 21 having an average grain size of 20 μm, being coated on the surface of a synthetic resin film 10 comprising a polyester based film having a thickness of 100 μm, is formed on the synthetic resin film 10. Then, on the uneven surface 20, a hard coating agent is applied, and then, a baking is performed, and a hardened hard coating layer 30 having an average thickness of approx. 10 μm, is formed. Also, the hardened hard coating layer may be formed in such a manner that a synthetic resin film having a thickness of 75 μm is used, and on surface, a hard coating agent containing a silica fine grain of the same average grain size is coated, and an ultraviolet ray is cost. Therefore, the gloss becomes less, and a white board can be used as a projection screen as well, and thus, the using application can be expanded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a synthetic resin film which can be used as a whiteboard and a projection screen.

[0002]

2. Description of the Related Art Conventionally, a synthetic resin film used as a white board is a white glossy film. Therefore, when used as a projection screen, it has a drawback that it is dazzling and difficult to see. On the other hand, the projection screen using a cloth as a base material could not be erased when a marker was used as a whiteboard. Further, the surface of the synthetic resin film obtained by finely embossing it can be used as a projection screen, but could not be completely erased by an eraser or the like.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a whiteboard and a projection screen film which can be used both as a whiteboard and as a projection screen. Another object of the present invention is to provide a whiteboard and a projection screen film which can be written and erased with a marker on a projection surface thereof while being used as a projection screen.

[0004]

In order to achieve the above object, a white board and a film for projection screen according to the present invention, as shown in FIG. With a hardened hard coat layer. Further, in order to achieve the above object, a white board and a projection screen film according to the present invention, as shown in the drawing, include a hard synthetic resin film containing hard fine particles such as silica and having a fine uneven surface formed thereon. It is formed by coating a coat layer.

In the present invention, as the synthetic resin film, a hard white polyester film, polyvinyl chloride film, polypropylene film or the like having a thickness of 10 to 250 microns is used. The fine irregularities on the surface of the synthetic resin film include all known methods such as a sand blast method, a coating method of hard fine particles such as silica, and a surface alkali saponification method. The hardening treatment with a hard coating agent is performed by applying a solution of silicone resin acrylate, polyurethane acrylate, epoxy acrylate or the like or an emulsion liquid to a synthetic resin film to a thickness of about 1 to 50 microns using a known coating device such as a gravure roll, and then applying a far infrared ray. A known baking device such as an incinerator
There are a known curing treatment method of baking at about 80 ° C. and a known curing treatment method of coating with a so-called UV coating for a hard coat to a thickness of about 1 to 50 μm and then irradiating with ultraviolet rays.

[0006]

FIG. 1 shows a first embodiment of the present invention. The invention product of this example is a synthetic resin film (polyester film (PET film)) 10 having a thickness of 100 μm and a minimum thickness of about 1 μm containing silica fine particles 21 having an average particle size of 20 μm applied to the surface.
Uneven surface 2 formed by 0 micron coating layer
0 and a hardened hard coating layer 30 having an average thickness of about 10 microns. The product of the present invention is formed by forming an uneven surface 20 on the surface of the synthetic resin film 10, applying a hard coating agent, and then baking to form a hardened hard coating layer 30.

[0007]

Second Embodiment A second embodiment of the present invention is shown in FIG. The product of this example is a synthetic resin film (polyester film (PET film)) 10B having a thickness of 75 microns, and silica fine particles 3 having an average particle size of 20 microns coated on its surface with a minimum thickness of about 10 microns.
And a cured hard coating layer 30B containing 1B. The product of the present invention is the above synthetic resin film 10B.
A hard coating agent containing fine silica particles 31B is applied to the surface, and then the cured hard coating layer 30B is formed by irradiating ultraviolet rays.

[0008]

According to the present invention, since the surface of the white synthetic resin film is subjected to unevenness processing and then cured,
It has low gloss and can be used as both a whiteboard and a projection screen. In addition, there is an advantage that the marker can be used during use as a projection screen. Further, by attaching the film to an existing whiteboard plate or attaching it to a wall, a partition, or the like, the use of the film as a whiteboard and a projection screen can be expanded.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view showing a preferred embodiment of the present invention with a part thereof omitted.

FIG. 2 is an enlarged cross-sectional view of another embodiment of the present invention, with a part omitted.

[Explanation of symbols]

 10, 10B White synthetic resin film 20 Uneven surface 21, 31 Hard fine particles such as silica 30 Cured hard coat layer

Claims (2)

[Claims] 1. A white board and a projection screen film, wherein the surface of a white synthetic resin film is formed into a fine uneven surface, and the fine uneven surface is coated with a hardened hard coat layer. 2. A whiteboard and projection screen film comprising a white synthetic resin film surface coated with a hard hard coat layer containing fine fine particles such as silica to form fine irregularities.