JPH10250286A - Surface structure for blackboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface structure of a blackboard for erasably writing even with chalk or aqueous ink. SOLUTION: In the surface structure for constituting a front surface of a blackboard of a writing board or a writing sheet for erasably writing a character or a graphic form or other with chalk or aqueous ink on the front surface, a front surface of a transparent thin plastic sheet of a body sheet 21 is roughed by a roughing means such as a sandblast to form a matt roughed surface 21a, and which is coated with hard coat resin 21b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention constitutes the surface of a writing board or a blackboard, which is a writing sheet, on which a character, a figure or the like can be drawn on the surface with black ink or water-based ink so as to be erasable. It relates to a surface structure.

[0002]

2. Description of the Related Art The term blackboard is, in a narrow sense, a black board that can be written with black ink, but in a broad sense, it refers to a board or sheet that can be written off with black ink or water-based ink. . That is, a blackboard has a board or sheet for black ink, and a board or sheet for water-based ink. And the color of the blackboard is not limited to black. The blackboard as a sheet can be used by being attached to the surface of another boat or the like by magnetic force or the like.

[0003]

However, conventionally, a blackboard capable of erasable writing with white ink has a drawback that erasable writing with water-based ink cannot be performed well, and erasable writing with water-based ink has been disadvantageous. Blackboards have the drawback that writing with chalk cannot be performed well.

Accordingly, an object of the present invention is to solve the above-mentioned drawbacks of the conventional blackboard and to provide a surface structure of the blackboard which can be written on in both black ink and water-based ink so as to be erasable.

[0005]

In order to achieve the above object, a surface structure of a blackboard according to the present invention is provided so that characters, figures, and the like can be drawn on a front surface of the blackboard with black ink or water-based ink. The surface structure constituting the front surface of the writing board or the blackboard which is a writing sheet, and the surface of a transparent thin plastic sheet which is a main body sheet is roughened by roughening means such as sandblasting. The first feature is that the matte rough surface is formed, and the rough surface is coated with a hard coat resin. Further, in addition to the first feature, the surface structure of the blackboard of the present invention is characterized in that, on the back surface of the main body sheet, a pattern consisting of lines, characters, figures, etc., which can be seen through from the front side, is applied. The feature is. Further, in addition to the surface structure of the blackboard of the present invention, the first or second feature, a pattern made of lines, characters, figures, etc., which can be seen through from the front side, is provided on the back surface of the main body sheet. The third feature is that the base sheet is attached.
In addition to the surface structure of the blackboard of the present invention, in addition to any of the first to third features, a fourth feature is that a rigid board serving as a main body of the blackboard is attached to the back surface side. . Further, in addition to the surface structure of the blackboard of the present invention, in addition to any one of the first to third features, a flexible magnet sheet serving as a main body of the sheet-like blackboard is attached to the back surface side. There are five features. In addition to the surface structure of the blackboard of the present invention and any of the above first to fifth features, the sixth feature is that the resin for hard coating is an ultraviolet-curable urethane acrylate resin.

[0006]

1 to 4 show an embodiment of the present invention. FIG. 1 is a front view of a blackboard, FIG. 2 is a cross-sectional model diagram of the blackboard, and FIG. 3 is a surface constituting a front surface of the blackboard. FIG. 4 is a perspective view of a base sheet bonded to the back surface of the surface structure. FIG. 5 is a perspective view of the back surface of the front surface structure for explaining an example of another embodiment of the present invention, and FIG. 6 is a cross-sectional model view of a blackboard showing an example of still another embodiment of the present invention.

FIGS. 1 to 4 show an example of a rigid blackboard 1 in which a surface component of the present invention is attached to a rigid board serving as a main body of a blackboard. 1 is configured.

The rigid board 10 may be made of wood, plastic, metal, or those having an iron plate attached thereto.

The surface structure 20 includes a main body sheet 21 and a base sheet 22. The main body sheet 21 is made of a transparent thin plastic sheet, and its surface is roughened to a mat-like rough surface 21a by sandblasting, and the rough surface is further coated with a hard coat resin 21b. Before the main body sheet 21 is still roughened, characters and lines can be drawn and wiped on the front surface of the main body sheet 21 with the water-based ink. However, since the surface has not been roughened yet, it is not possible to draw characters and lines in chalk. Next, by making the surface of the main body sheet 21 rough by sandblasting, the black ink is appropriately scraped off by the rough surface, and it is possible to draw characters and lines. However, when the main sheet 21 is simply roughened by sandblasting or the like, when characters or the like are drawn with the water-based ink, the ink tends to remain on the rough surface, and the ink cannot be easily completely erased. State. In other words, characters and lines cannot be erased by the drawn aqueous ink. Next, by coating the rough surface of the main body sheet 21 by sandblasting with a resin for hard coating, a deep layer of the rough surface is appropriately filled, and the surface is hard and a dense layer hard to be worn or scratched is formed. Also, the penetration of the water-based ink is eliminated, and it is possible to easily and reliably wipe off the ink.
Of course, since appropriate irregularities remain on the surface of the main body sheet 21, characters and lines in black ink can be easily drawn.

The base sheet 22 (see also FIG. 4)
This is a sheet for configuring patterns such as characters, lines, and figures that are displayed in advance on a blackboard. That is, characters 22a, lines 22b, and patterns are drawn on the front surface of the base sheet 22 with various plotters, printing machines, and other description means in advance, and the base sheet 22 is adhered to the back surface of the main body sheet 21, Characters 22a, lines 22b, patterns, etc. drawn on the base sheet 22 are surface structures
It is made visible through the surface of the 20 surfaces. Therefore, when the rigid board 10 is attached to the back surface side of the surface component 20, that is, when the surface component 20 is attached to the front surface 10 a side of the rigid board 10, the characters 22 a, The line 22b and the pattern are characters, lines, and patterns previously expressed on the surface of the rigid blackboard 1 (see FIG. 1).

When the rigid board 10 is attached to the back side of the surface structure 20 in which the main body sheet 21 and the base sheet 22 are attached, that is, the front surface 10a of the rigid board 10 serving as the main body of the rigid blackboard 1 The rigid blackboard 1 is formed by laminating the components 20, and the rigid blackboard 1 can be erased with either black ink or water-based ink.
The characters, lines, and patterns written on the base sheet 22 appear as characters, lines, and patterns previously expressed on the blackboard. When the base sheet 22 is a transparent sheet, the surface 10a of the rigid board 10 is previously painted with black, green, or another color, which is the color of a blackboard, by painting or the like. When the base sheet 22 is a colored sheet, that color is the color of the blackboard.

The base sheet 22 is not always necessary even when expressing characters, lines, and patterns on a blackboard in advance. Instead of drawing characters 22a, lines 22b, and patterns on the base sheet 22, they may be drawn on the back surface of the main body sheet 21. FIG. 5 shows another embodiment of the surface structure 20 of the present invention.
That is, in this example, characters 21c, lines 21d, and patterns are drawn on the back surface of the main body sheet 21 in advance without using the base sheet 22. However, by drawing right and left oppositely, normal characters, lines, and patterns are obtained when viewed from the front surface. Of course, the above-described rough surface 21a and coating 21b are applied to the front surface of the main body sheet 21. The rigid blackboard 1 is formed by laminating the surface component 20 composed of the main body sheet 21 without the base sheet 22 with the rigid board 10. In this case, the color of the blackboard of the rigid blackboard 1 is the front surface 10a of the rigid board 10.
Is previously colored with a paint or the like. In the case of a plain blackboard which does not need to preliminarily express characters, lines, and patterns on the blackboard, the base sheet 22 is not necessary, and, of course, the characters, lines, and patterns are printed on the back surface of the main body sheet 21. There is no need to draw.

The surface construct 20 of the present invention does not necessarily need to be bonded to the rigid board 10 to form the rigid blackboard 1. A soft blackboard sheet other than the rigid blackboard 1 may be used.
FIG. 6 shows still another embodiment of the surface structure 20 of the present invention. That is, in this example, a soft blackboard sheet can be obtained by attaching the flexible magnet sheet 3 to the back surface side of the surface structure 20. In this case, the surface component 20 may or may not have the base sheet 22. The main body sheet 21 has the rough surface 21a and the coating 21b described above. The magnet sheet 3 has a suitable strength, for example, by laminating a thin aluminum sheet to a rubber sheet in which a permanent magnet component is dispersed, and has a sufficient degree of flexibility to be wound around and carried. If there is a certain magnetic sheet, the material of the constituent elements is not particularly limited.

The main body sheet 21 is a transparent thin sheet of a synthetic resin made of, for example, vinyl chloride or polyester. However, the main body sheet 21 does not easily break due to scratching or the like, and may be any transparent plastic sheet. is there. The base sheet 22 can be made of paper that does not easily break, synthetic paper, or a thin plastic sheet such as vinyl chloride or polyester. As the resin for the hard coat, for example, an ultraviolet-curable urethane acrylate resin is used. This resin has a very high hardness, has good abrasion resistance, and has good adhesion to plastic as a paint. Of course, the resin for the hard coat is made of another material and has good adhesion to plastic, and can be a resin having good hardness and scratch resistance. As to the degree of the rough surface 21a and the degree of the coating 21b, what kind of degree has already been described, but as a specific numerical value, the roughness of the rough surface 21a is about 10 to 30 microns by sandblasting. The degree of coating can be 3-9 microns.

[0015]

According to the first aspect of the present invention, characters, figures, and the like are drawn on a surface of a blackboard or a water-based ink in a freely erasable manner. A surface structure that constitutes the front surface of a writing board or a blackboard that is a writing sheet that can be used, and a surface of a transparent thin plastic sheet that is a main body sheet is roughened by sandblasting or the like. By roughening by means, it becomes a matte rough surface, and since this rough surface is coated with a resin for hard coating, it can be written and erased well with black ink and using water-based ink A convenient blackboard that can be written and erased well can be provided. According to the surface structure of the blackboard according to claim 2,
In addition to the effect of the configuration according to claim 1, by applying a pattern consisting of lines, characters, figures, and the like that can be seen through from the front side to the back surface of the main body sheet, it is possible to use either black ink or water-based ink. In addition, since characters, lines, and patterns are previously expressed on the surface of the blackboard, it is possible to provide a blackboard that can be conveniently used according to the intended use. According to the surface structure of the blackboard according to the third aspect, in addition to the effects of the configuration according to the first aspect, the back surface of the main body sheet has lines, characters, and graphics that can be seen through from the front side. By attaching a base sheet with a pattern consisting of etc., both black ink and water-based ink can be used, and characters, lines and patterns are pre-expressed on the surface of the blackboard, which is convenient according to the application A blackboard that can be used can be provided. According to the surface structure of the blackboard according to claim 4, claim 1 is provided.
In addition to the effects of the configuration described in any one of (1) to (3), a rigid board serving as the main body of the blackboard is attached to the back surface side, so that a rigid blackboard that can be used with black ink or water-based ink is provided. Can be. According to the surface structure of the blackboard according to claim 5, in addition to the effect of the structure according to any one of claims 1 to 3, a flexible magnet which becomes the main body of the sheet-like blackboard on the back surface side. Since the sheets are stuck together, both black ink and water-based ink can be used. Further, it is possible to provide a convenient blackboard that is easy to carry and can be magnetically attached to the surface of another board as needed. According to the surface structure of the blackboard according to claim 6, in addition to the effect of the structure according to any one of claims 1 to 5, the resin for hard coating is an ultraviolet-curable urethane acrylate resin. It is possible to provide a blackboard for both black ink and water-based ink, which is hard to be damaged and can easily and reliably erase the water-based ink.

[Brief description of the drawings]

FIG. 1 is a front view of a rigid blackboard showing an example of an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a rigid blackboard showing an example of an embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view of a surface structure constituting a front surface of a rigid blackboard showing an example of an embodiment of the present invention.

FIG. 4 is a perspective view of a base sheet adhered to a back surface of a surface structure of a rigid blackboard showing an example of an embodiment of the present invention.

FIG. 5 is a perspective view of a back surface of a front surface structure for explaining an example of another embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of a blackboard showing an example of still another embodiment of the present invention.

[Explanation of symbols]

 1 Rigid blackboard 3 Magnet sheet 10 Rigid blackboard 20 Surface structure 21 Body sheet 21a Rough surface 21b Coating 21c Character 21d line 22 Base sheet 22a Character 22b line

Claims (6)

[Claims] 1. A surface component constituting the front surface of a writing board or a blackboard that is a writing sheet in which characters, figures, and the like can be drawn on the front surface so as to be erasable with black ink or water-based ink. The surface of a transparent thin plastic sheet as a main body sheet is roughened by a roughening means such as sandblasting to form a matte rough surface, and the rough surface is coated with a hard coat resin. A surface structure of a blackboard, characterized in that: 2. The surface structure of a blackboard according to claim 1, wherein a pattern composed of lines, characters, figures, etc., which can be seen through from the front side, is applied to the back surface of the main body sheet. 3. The base sheet according to claim 1, wherein a base sheet having a pattern formed of lines, characters, figures, etc., which can be seen through from the front side, is attached to the back surface of the main body sheet. Blackboard surface composition. 4. A blackboard as a main body of a blackboard is bonded to the back surface side.
4. The surface structure of a blackboard according to any one of items 1 to 3. 5. The surface structure of a blackboard according to claim 1, wherein a flexible magnet sheet serving as a main body of the sheet-shaped blackboard is attached to the back surface side. 6. The surface structure of a blackboard according to claim 1, wherein the resin for hard coat is an ultraviolet-curable urethane acrylate resin.