JPH07309097A - Blackboard group - Google Patents

Abstract

PURPOSE:To provide a group of blackboards such as a blackboard having a blackboard face which can be manufactured at a comparatively low cost, is difficult to rust and suitable for long time use, a whiteboard, a marker board, etc. CONSTITUTION:A blackboard face wherein a drawing face of a hot-dip aluminum-coated carbon steel sheet 1 or an aluminum and zinc alloy-coated steel sheet is finished by baking with blackboard coating 2 or a blackboard face wherein a plastic film of fluororesin or the like is stuck onto a baking finished drawing face of the steel sheet 1 with the blackboard coating 2, is fixed to a ground board 3. The blackboard coating 2 is preferably applied onto the hot-dip aluminum-coated carbon steel sheet 1 on which a primer 5 of an epoxy resin or the like is undercoated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to blackboards, and more particularly,
The present invention relates to blackboards including blackboards, whiteboards, marker boards, etc. which have features on the blackboard surface.

[0002]

2. Description of the Related Art According to Japanese Industrial Standards, blackboards are classified into sharpened blackboards, baked steel blackboards and enameled blackboards according to the difference in blackboard surface. In Japan, this in-baked steel blackboard occupies about 60% of the market. A baked steel blackboard is a so-called choke board, and the blackboard surface generally has a plate thickness of 0.
It is made by adhering a blackboard paint baked onto a steel plate (zinc iron plate) of 3 to 0.5 mm to the main plate.

[0003]

As described above, in Japan, a baked steel blackboard is mainly used, but it has a drawback that it is easily rusted because a steel plate is used. Therefore, it is an object of the present invention to provide a blackboard such as a blackboard, a white board, a marker board, etc., which has a blackboard surface that can be manufactured at a relatively low cost, is resistant to rust, and is suitable for long-term use.

[0004]

The present invention is directed to a blackboard surface obtained by baking-painting a blackboard paint on the drawing surface of a hot dip aluminum plated steel plate or an aluminum / zinc alloy plated steel plate, or a blackboard paint on the drawing surface of the steel plate. The above problems were solved by using a blackboard, which has a blackboard surface on which a plastic film such as a fluororesin or the like is adhered and fixed on a ground board, a whiteboard, a blackboard such as a marker board. The blackboard paint is preferably applied on a plated steel plate with a primer such as an epoxy resin being undercoated.

[0005]

[Working] In the present invention, since a hot-dip aluminum-plated steel sheet or an aluminum / zinc alloy-plated steel sheet is used, it has corrosion resistance and is resistant to rust. Further, when the blackboard paint is coated on the plated steel sheet with the primer undercoating, the primer serves as a binder to prevent the blackboard paint from peeling off and to block the permeation of water.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the present invention, the blackboard surface is manufactured by baking and painting the blackboard paint 2 on the drawing surface of the plated steel sheet 1 which has been subjected to hot dip aluminum plating or aluminum / zinc alloy plating. That is, by using the plated steel sheet 1 obtained by applying hot-dip aluminum plating to the blackboard surface, not only the strength but also the corrosion resistance is provided, and the rust resistance is reduced.

The blackboard paint 2 is baked on the drawing surface of the plated steel sheet 1 which has been subjected to hot dip aluminum plating or aluminum-zinc alloy plating. For example, after subjecting the plated steel sheet 1 to a pretreatment for coating, a blackboard, a white board or a marker board.
The special urethane-based blackboard paint 2 that should be used for printing is baked on the drawing surface.

More specifically, blackboards are surface-coated according to their respective uses. That is, chokbo
Baking paint that makes the coating surface relatively rough is used to make it into a board, and a white board or a marker whose coating surface has a fine grain to make it a marker board. -A baking paint suitable for the board is used.

In the present invention, as the blackboard paint 2, for example, one in which urethane paint is used as a base and which is sprinkled with carbon-based fine powder (carborundum) is used in consideration of abrasion resistance. In the case of blackboards, most of them are used indoors, so it is not necessary to pay much attention to ultraviolet deterioration.
From the viewpoint of having a hardness suitable for blackboard applications, urethane-based paints that are weak against ultraviolet rays can be used.

However, since the blackboard paint 2 and the base metal, that is, the plated steel plate 1, are weak in adhesion and adhesion, primer 5 is undercoated as a pretreatment in order to strengthen the adhesion between the two. . As the primer 5, acrylic resin, phenol resin, etc. may be considered, but epoxy resin is most recommended in view of the relationship with the blackboard paint 2 and the plated steel sheet 1. Needless to say, the resin is not limited to the epoxy resin, and any resin that is compatible with the blackboard paint 2 and the plated steel plate 1 can be used. The primer-5 prevents the blackboard paint 2 and the plated steel plate 1 from peeling off.

The primer 5 not only fulfills the above-mentioned role but also contributes to rust prevention. That is, blackboard paint 2
Has water permeability, the water adhering to the surface of the blackboard will penetrate into the plated steel sheet 1.
By interposing the dense membrane of No. 5, the permeation of water is prevented there. Needless to say, plated steel sheet 1
Has a sufficient anti-corrosion function by itself, but the action of this primer 5 makes the anti-corrosion power of the plated steel sheet 1 perfect, and also prevents deterioration of properties due to penetration of chemicals and the like. .

If necessary, a polyethylene film may be attached to the blackboard paint 2 to protect the coating film surface. Alternatively, it is also possible to apply a baking coating to the plated steel sheet 1 and then attach a plastic film such as a fluororesin, and use this as the drawing surface. Also in this case, a surface protective film such as polyethylene may be further attached thereon. The blackboard surface manufactured as above is
It is fixed on the main plate 3 by a conventional method to form a blackboard. In addition, 4 is a reinforcement frame.

[0013]

The present invention is as described above, and the surface of the blackboard is a hot-dip aluminum-plated steel sheet or aluminum.
Since zinc alloy-plated steel sheet coated with blackboard paint or the above-mentioned plated steel sheet with a film (fluorine-based etc.) attached is used, it has excellent corrosion resistance as well as strength and does not rust easily. There is an effect that blackboards such as possible blackboards, white boards, and marker boards are obtained.
When the blackboard paint is applied on the plated steel sheet with a primer undercoat, not only is the peeling of the blackboard paint prevented, but the rustproof effect of the plated steel sheet becomes even more perfect.
Further, there is an effect that there is no fear of deterioration of properties.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a blackboard according to the present invention.

FIG. 2 is an enlarged cross-sectional view of the intermediate cut-away taken along the line AA of FIG.

[Explanation of symbols]

 1 Plated steel plate 2 Paint for blackboard 3 Base plate 4 Reinforcing frame 5 Primer

Claims (3)

[Claims] 1. A blackboard characterized in that a blackboard surface coated with a blackboard paint is fixed to a ground plate on a drawing surface of a hot dip aluminum plated steel plate or an aluminum / zinc alloy plated steel plate. 2. A blackboard paint is applied to the drawing surface of a hot dip aluminum plated steel plate or an aluminum / zinc alloy plated steel plate, and a blackboard surface having a plastic film such as a fluororesin attached thereon is fixed to the main plate. And blackboards. 3. The blackboard according to claim 1 or 2, wherein the plated steel sheet is undercoated with a primer such as an epoxy resin and then coated with a blackboard paint.