JPS63276600A - Eraser - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention enables easy and sanitary wiping of characters drawn in chalk on a blackboard surface, and also allows the wiping body to be easily cleaned or replaced. This article relates to a new blackboard wiper that can be used to wipe a blackboard.

[Conventional technology and its problems]

Cloth and other blackboard wipes that have been widely used include
Chalk powder was floating and scattering around when wiping the letters on the board, which had a negative impact on the health of teachers and students, and chalk powder that adhered to the surface of the blackboard after wiping. It was customary to separately remove chalk by hitting it with a stick, but this also had the disadvantage of causing chalk pollution.

In response to this, in the past some traditional blackboard wipers like the ones mentioned above were equipped with mechanical suction devices for chalk dust, but these were larger and heavier. In addition to being inconvenient to use, it was not possible to collect enough chalk powder.

[Means for solving problems]

Therefore, the inventor of the present invention has conducted extensive experiments and research with the aim of wiping away letters, etc. on a blackboard surface easily and without scattering chalk powder. The upper half wiping body is made of an open-cell resin foam material so that the two can be separated, while a chemical solution that has the property of dissolving and collecting chalk powder is sprayed onto the surface of the upper half wiping body during use. The above-mentioned problems can be solved all at once by coating and impregnating with suitable means.

[For production]

In the present invention, the chemical liquid that has permeated into the upper half wiping body by capillary action oozes out during wiping and dissolves the chalk powder on the blackboard surface, and then further dispels the dissolved chalk powder by the elastic force of the entire wiping body. It has a special effect of being absorbed into the body after wiping the upper half of the body.

〔Example〕

Hereinafter, the structure will be described in more detail according to the embodiment shown in the drawings. In the drawings, 1 is a base made of hard material, and 2
is a wiping body with a thickness of 5 to 5 cm fixed to one side of the base 1, and the wiping body 2 is made of an open-cell foam material made of polyester with a cell magnification of 16 times. Only a thickness of 1.5 cm to 2.5 cm is used as the upper half wiping body 2' and is separable via a hook-and-loop fastener 3.

Incidentally, reference numeral 4 in the figure indicates a hand attached to the other surface of the base body 1.

Before use, the surface of the upper half wiping body 2' is impregnated with a chemical solution 5 which has the property of dissolving and collecting chalk powder by spraying it with a spray + S] or the like. However, to give an example of the above-mentioned chalk powder dissolving/collecting chemical solution 5, water is 82.5% (weight ratio, the same applies hereinafter) and alcohol (blunt ethanol) is added as a volatilization accelerating and surface tension reducing agent. 15% processed, and 2.5% sodium alkyl ether sulfate as an anionic surfactant.
These are added and thoroughly mixed.

Although the lower half 2'' of the wiping body in the present invention is preferably made of open-cell foamed resin, the same effect can be obtained even if this portion is made of closed-cell foam.

Next, to describe the usage of the blackboard wiper with the above structure, first, spray an appropriate amount of the chemical solution 5 onto the surface of the upper half wiping body 2'', and then apply appropriate pressure to the blackboard surface to which the chalk has adhered. By rubbing with force, the upper half of the wiping body 2"
The chemical solution 5 that has permeated into the board leaches out to dissolve and collect chalk powder on the board surface.

After that, by gently removing the blackboard wiper from the board surface, the restoration elasticity of the wiping body 2 whose pressing force with the board surface is released, and the synergistic effect of the low surface tension chemical solution 5 cause the liquid to dissolve first. - Since the collected chalk powder is reliably absorbed into the air bubbles of the upper half wiping body 2', the blackboard surface is cleaned extremely beautifully after wiping, and scattering of chalk powder can be reliably prevented. In addition, the alcohol in the chemical component imparts quick-drying properties to the board surface, so the moisture on the blackboard surface disappears quickly after wiping, allowing new characters to be written continuously.

By providing a large number of small holes 6 on the surface of the upper half wiping body 2', it is possible to further increase the amount of chalk powder collected after dissolving it (see Fig. 3). If a covering material 7 such as paper, gauze, or other cloth or nonwoven fabric is further attached to the surface, the rubbing noise and resistance during wiping will be alleviated, and the wiping operation can be performed more smoothly (Fig. 4). reference).

On the other hand, although it is natural that the open-cell synthetic resin foam material is not limited to the polyester-based synthetic resin, it is particularly important to limit the cell ratio of the upper half wiping body 2 to the above range. If it is more than 25%, the permeability of the chemical solution will be reduced, and if it is less than 10%, the ability to absorb dissolved chalk powder will be significantly reduced.

Furthermore, the composition ratio of the alcohol and surfactant is not specified by the final value, but according to experiments, if the former is in the range of 20 to 30% and the latter is in the range of 2 to 3.5%,
It was clear that the same effects as described above could be obtained.

Furthermore, the above-mentioned alcohol is not limited to the above ethanol, but it is preferable to avoid substances harmful to the human body, such as methyl alcohol, and examples of anionic surfactants include olefin sulfate ester salts, alkylallylsulfonic acid, etc. Furthermore, an appropriate adsorbent was added to the above surfactant as necessary to assist in the dissolution and collection of chalk powder. It is also free to use composites.

In addition, by adding an appropriate fragrance to the chemical solution as needed, the unique odor of chalk powder can be eliminated by the fragrance emitted during wiping.

The chemical liquid in the present invention is not limited to the above-mentioned components, but can be arbitrarily selected as long as it has the same dissolving and collecting effect on chalk powder as these.

In addition, the above spray [S] does not specify the structure as long as it is difficult for air to enter inside in order to prevent foaming when spraying. A nonwoven fabric, cotton, etc. may be prepared and immersed in the chemical liquid in the saucer, and the surface of the upper half wiping body may be brought into contact with the chemical liquid-impregnated material of the saucer to apply and absorb the chemical liquid.

〔Effect of the invention〕

As described above, the blackboard wiper of the present invention has the physical properties of an open-cell synthetic resin foam material with an appropriate expansion rate, and the dissolving effect of a chemical solution on chalk powder with the above-mentioned scientific properties. The wiping body works together to easily and reliably wipe away chalk on the board surface, and is always hygienic as there is no floating or scattering of chalk powder to the outside.The above-mentioned wiping body also absorbs chalk powder Only the half part can be removed at any time and easily washed with water, allowing repeated use, or by replacing only the upper half wiping body with a spare part, it can withstand long-term use and is economical. It is possible to obtain special effects that could not be expected from conventional blackboard wiping.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a state in which a chemical solution is applied to a blackboard wiper according to the present invention, FIG. 2 is a perspective view showing a state in which the upper half of the wiper is separated, and FIGS. It is a perspective view showing an example of this. In the drawings, 1: base body, 2: wiping body, 3: hook-and-loop fastener, 5: chemical solution, 6: small hole, 7: coating material. Applicant for the above patent: Obayashi City, 1 non-judicial agent, patent attorney Kazuo Ohara 2... Wiping body 3... Surface fastener - Figure 1 Figure 5... Chemical solution Figure 2 Figure 4

Claims (1)

[Scope of Claims] 1. At least the upper half of the wiping body 2 fixed to one surface of the base 1 The wiping body 2' is made of an open-cell resin foam material and is separable from the other. A blackboard wiper characterized in that the surface of the body 2' is impregnated with a chemical solution capable of dissolving and collecting chalk powder. 2. The blackboard wiping device according to claim 1, wherein the upper half wiping body 2' is provided with a large number of small holes 6. 3. The blackboard wiper according to claim 1 or 2, wherein a coating material 7 is adhered to the surface of the upper half wiping body 2'.