JP3035740U - Blackboard sheet - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To reduce the bulk, to easily carry it with a small number of people, to easily attach it to an existing blackboard surface without the need for gluing work, and to add a new blackboard surface. The challenge is to provide a blackboard sheet that can SOLUTION: A blackboard sheet 10 is newly attached to the surface of an existing blackboard to form the surface of the blackboard, and a core member is formed on the upper surface of a magnetic rubber sheet 11 which forms a backside member, and a paint is applied. It is composed of a flexible sheet which can be freely wound, in which a metal film 12 constituting a base member for laminating is laminated and a coating material 13 constituting a front member is laminated on the upper surface of the metal film 12.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a blackboard sheet used to replace a blackboard.

[0002]

[Prior art]

 Blackboards used in schools and other places are constructed, for example, by sticking a blackboard paint on the front side to a plywood board, etc. , The chalk will not ride well, so you have to replace the entire blackboard with a new one or repair the surface of the blackboard. As one of the methods for repairing the surface of the blackboard, conventionally, an iron plate or an enamel plate coated with a blackboard paint, or a product lined with a veneer plate, is cut into the size of the blackboard and attached to the blackboard. Then, a method was adopted in which this board was pasted and pasted onto the surface of the existing blackboard to form a new blackboard surface.

[0003]

[Problems to be solved by the device]

 However, in the conventional method of pasting a board cut into the size of the above blackboard onto the surface of an existing blackboard, the board is so large that it can be bulky and carried by only a few people. Moreover, since the board is thin compared to the area, there was a drawback that the board was twisted and distorted while carrying it. Furthermore, when sticking the board to the surface of the blackboard, it is necessary to apply an adhesive to the surface of the blackboard or the back of the board, and it is not easy to stick a large area board after applying glue. There was a drawback that it required the number of workers.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, can reduce the bulk, can be easily carried by a small number of people, does not require work for gluing, and can easily be used for existing blackboard surfaces. The challenge is to provide a blackboard sheet that can be attached to a new blackboard surface to create a new blackboard surface.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the blackboard sheet of the present invention is a blackboard sheet that becomes a new blackboard surface by being attached to the surface of an existing blackboard, and is a magnetic rubber sheet that constitutes the backside member. A metal film forming a core member and a base member for laminating the paint is laminated on the upper surface, and the paint forming the front member is laminated on the upper surface of the metal film. The first feature is that it is made of a flexible sheet. In addition to the first characteristic, the blackboard sheet of the present invention has a second characteristic that the flexible sheet is wound in a roll shape. The blackboard sheet of the present invention has, in addition to the above first or second characteristics, the coating material constituting the front side member is composed of 100 parts of thermosetting acrylic resin and 10 to 100 amino resins as a cross-linking agent. The third characteristic is that the basic composition is a composition in which 1 part to 30 parts of epoxy resin is mixed, and a pigment is added to the basic composition.

Regarding the application of the blackboard sheet according to the first feature to an existing blackboard, the attachment target is limited to the existing blackboard using a ferromagnetic material such as an iron plate or an enamel plate. By removing the pressing edge on the peripheral edge of the blackboard and sticking the blackboard sheet to the surface of the blackboard from which the pressing edge has been removed using the magnetic rubber sheet that is the backside member, the blackboard sheet by magnetic force is applied. It is possible to complete the close fixing of the to the blackboard surface. At that time, since it is not gluing, it can be easily re-attached. After the blackboard sheet is attached to the entire blackboard surface with its magnetic force without wrinkles, the blackboard holding edge is used to fix the peripheral edge of the blackboard sheet. Is completed. Since the blackboard sheet of the present invention is lighter than the conventional board, it is easy to carry. Further, since it is a flexible sheet that can be wound freely, the volume can be reduced by appropriately winding it, and it becomes easy to store and carry. Since the blackboard boat of the present invention is thin and flexible compared to the conventional board, it is in an environment where wrinkles and the like are likely to occur, but without sticking glue, stick it to the surface of the blackboard with uniform magnetism using magnetic rubber. Therefore, it is possible to suppress the occurrence of wrinkles and the like compared to the case of gluing, and even if it fails, it is possible to redo easily and as a result, it is possible to reliably reproduce a blackboard with a very clean surface. it can. If this blackboard sheet becomes old, it can be easily replaced with a new blackboard sheet many times.

Further, according to the second feature, in addition to the action of the first feature, the flexible sheet is wound in a roll shape, so that it is easier to carry. Also, the sticking work to the surface of the existing black board is very easy because the rolls can be stuck while rolling the roll along the surface of the blackboard one after another from the end of the flexible sheet wound in a roll shape. And, it can be performed by a small number of people.

Further, according to the third feature, in addition to the action of the first feature or the second feature, the composition of the coating material forming the front member is based on 100 parts of the thermosetting acrylic resin. The basic composition is a mixture of 10 to 100 parts of an amino resin and 1 to 30 parts of an epoxy resin as a cross-linking agent. As a blackboard paint suitable for being laminated on the surface of a sheet, it is sufficiently flexible and adheres so that it does not crack when the sheet is bent or rolled. Conventionally, a blackboard paint that is good for forming a solid surface layer like natural stone stone with a paint has been used for laminating a solid blackboard surface member that has no flexibility or winding tolerance. It had been.

[0009]

[Embodiment of the invention]

 FIG. 1 is a cross-sectional configuration diagram of a blackboard sheet showing an embodiment of the present invention, and FIG. 2 is a view showing a state in which a blackboard sheet showing an embodiment of the present invention is wound in a roll shape. FIG. 3 is a diagram for explaining an example of use of the blackboard sheet showing the embodiment of the present invention.

In FIG. 1, a blackboard sheet 10 has a magnetic rubber sheet 11 as a back side member that constitutes the back side, that is, a lower side, and a core member is formed on the upper surface of the magnetic rubber sheet 11 and a coating material is laminated. A metal film 12 forming a base member is laminated, and a coating material 13 forming a front member is laminated on the upper surface of the metal film 12. Since the constituent materials are the magnetic rubber sheet 11, the metal film 12 and the paint 13, the blackboard sheet 10 of the present invention is a flexible sheet that can be freely wound.

The blackboard sheet 10 has a thickness of, for example, about 0.5 mm to several mm. This thickness is considerably smaller than that of conventional replacement boards, and the weight is therefore sufficiently lighter than that of conventional boards. Of course, the thickness of the blackboard sheet 10 is not necessarily limited to the above range as long as the thickness is such that it can be wound. It is possible to use an appropriate thickness depending on the total weight and the convenience of using the blackboard after being replaced. In this embodiment, it is about 1 mm. Further, the magnetic rubber sheet 11 is a sheet in which a magnetic material is uniformly dispersed in rubber, and has a flexibility such that it can be sufficiently wound. And, the thickness thereof occupies substantially half or more of the thickness of the blackboard sheet 10. Further, the metal film 12 serves as a core material of the blackboard sheet 10 to add a certain amount of strength and hardness to the flexibility of the magnetic rubber sheet 11, and also serves as a basis for firmly and firmly adhering the paint 13 thereto. Serves as a member. As the metal film 12, for example, an aluminum film or an iron film can be used. However, other metal films or plastic films are also possible. The thickness of the metal film 12 is about several tens μm to several hundreds μm from the viewpoint of strength and flexibility. The thickness of the metal film 12 is sufficiently smaller than that of a conventional refill board. In the case of this embodiment, an aluminum film is used and its thickness is 40 to 200 μm.

The paint 13 laminated on the upper surface of the metal film 12 is composed of 100 parts of a thermosetting acrylic resin as a blackboard paint, 10 to 100 parts of an amino resin as a crosslinking agent, and 1 to 30 parts of an epoxy resin. The mixture is used as a basic resin composition. 100 parts of this basic resin are mixed with various color pigments having an average particle size of 1 to 100 μm and extender pigments in a ratio of 100 to 350 parts. Disperse with a sand grind mill etc. and adjust the degree of dispersion with a grind gauge to be 30 to 50 μm. The above blackboard paint 13 can be widely used by using a primer as long as it is a material that has a heat resistance of about 200 ° C, but when using an aluminum film or an iron film, it is suitable for the surface of the film. After pretreatment, the epoxy primer was baked at 5 μm and 280 ℃ for 20 seconds (maximum film temperature 180 to 200 ℃), and the above blackboard paint was coated with a reverse coater to a dry coating amount of 10 to 30 μm. It is applied continuously and baked at 280 ° C for 60 seconds (maximum film temperature 210 to 240 ° C). When the paint 13 is laminated on the metal film 12 by baking as described above, the metal film 12 and the magnetic rubber sheet 11 after the paint is laminated are bonded together. Of course, the paint 13 is not limited to the above-mentioned one, and any paint suitable for a blackboard can be used as long as it adheres to a flexible sheet without cracking.

The blackboard sheet 10 formed as described above is wound and rolled into a roll shape as shown in FIG. That is, it is easy to carry and can be carried by one person. It is also easy to attach to the surface of an existing blackboard. That is, referring to FIG. 3, first, the pressing edge E at the peripheral edge of the surface S of the existing blackboard B is removed, and the pressing edge E is rolled to any one of the left and right sides (the right side in FIG. 3) of the blackboard surface. The edge 10a of the blackboard sheet 10 is aligned, and the surface of the magnetic rubber sheet 11 is sequentially attached to the other side from one side of the blackboard sheet 10 so that the blackboard sheet 10 is firmly attached to the blackboard surface S by magnetic force. Can be completed. After the sticking of the blackboard sheet 10 is completed, the peripheral edge of the blackboard surface is fixed by the above-mentioned pressing edge E, whereby a blackboard having a new blackboard surface with which the blackboard sheet 10 is firmly attached is completed.

[0014]

[Effect of the invention]

 According to the blackboard sheet of the first aspect of the present invention, the basic member for forming the core member and laminating the coating material is formed on the upper surface of the magnetic rubber sheet forming the back member. It consists of a flexible flexible sheet made by laminating the constituent metal films and laminating the paint that constitutes the front side member on the upper surface of the metal film, so it is lighter and easier to carry than conventional boards. is there. Further, since it is a flexible sheet that can be wound freely, the volume can be reduced by appropriately winding it, and it becomes easy to store and carry. In addition, since it can be adhered to the surface of the blackboard with uniform magnetism without using gluing, wrinkles can be suppressed compared to the case of gluing, and even if it fails, it can be easily redone. As a result, it is possible to reliably reproduce a blackboard with a very clean surface. Also, if the attached blackboard sheet becomes old, it can be easily replaced with a new blackboard sheet many times. According to the blackboard sheet of claim 2, in addition to the effect of the configuration of claim 1, since the flexible sheet is wound in a roll shape, it is easy to carry one layer. . In addition, the pasting work on the surface of the existing blackboard can be done while rolling the rolls along the surface of the blackboard in order from the end of the flexible sheet wound in a roll shape, so the work is very easy. And it can be done by a small number of people. Further, according to the blackboard sheet of claim 3, in addition to the effect of the composition of claim 1 or 2, the coating material forming the front member has 100 parts of thermosetting acrylic resin, The basic composition is a mixture of 10 to 100 parts of amino resin and 1 to 30 parts of epoxy resin as a cross-linking agent, and the pigment is added to the basic composition, so it can be laminated on the surface of a flexible sheet that can be freely wound. It is a suitable blackboard paint that can be adhered to with sufficient flexibility and does not crack when the sheet is bent or rolled.

[Brief description of the drawings]

FIG. 1 is a cross-sectional configuration diagram of a blackboard sheet showing an embodiment.

FIG. 2 is a diagram showing a state in which the blackboard sheet showing the embodiment is wound in a roll shape.

FIG. 3 is a diagram illustrating a usage example of the blackboard sheet according to the embodiment.

[Description of sign]

 10 Blackboard sheet 11 Magnetic rubber sheet 12 Metal film 13 Paint

Claims (3)

[Utility model registration claims] 1. A blackboard sheet which is newly attached to the surface of an existing blackboard so as to become the surface of the blackboard, wherein a core member is formed and a paint is laminated on the upper surface of a magnetic rubber sheet forming a backside member. A sheet for a blackboard, which is formed of a flexible flexible sheet formed by laminating a metal film that constitutes a base member for laminating and a coating material that constitutes a front member on the upper surface of the metal film. . 2. The blackboard sheet according to claim 1, wherein the flexible sheet is wound in a roll shape. 3. The coating material constituting the front side member comprises 100 parts of thermosetting acrylic resin and amino resin as a cross-linking agent.
The blackboard sheet according to claim 1 or 2, wherein a basic composition is obtained by mixing 10 to 100 parts and an epoxy resin at a ratio of 1 to 30 parts, and a pigment is added to the basic composition.