JP2006347131A - Eraser for writing tool and method for erasing chart - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To develop an eraser which can cleanly erase a chart drawn on a writing board by calipers or the like. <P>SOLUTION: The eraser 1 is made of a nonwoven fabric using a pulp as a raw material. The eraser 1 is especially suitable for erasing the chart drawn on the writing board by the calipers 15, and a number of the erasers are stored in a storing case 2 by folding them. When a user pinches the eraser 1a projected from the storing case 2 and takes it out, a part of the next iraser 1b is projected from the storing case 2. When the chart is erased, the surface of the writing board 10 is wiped with the eraser 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tool for erasing a diagram drawn on a writing board such as a blackboard or a whiteboard. The present invention also relates to a method for erasing a diagram drawn with a path.

Blackboards and whiteboards are widely used as a means of communication because they can repeatedly draw and erase letters and drawings.
As is well known, blackboards and whiteboards are drawn with white ink or markers. When erasing the diagram, wipe the surface of the blackboard with an eraser. The eraser is also referred to as “blackboard wipe” or “white board wipe”, and is disclosed, for example, in Patent Document 1.
Japanese Utility Model Publication No. 1-175895 Japanese Utility Model Publication No. 56-86193

  Each of the erasers disclosed in Patent Documents 1 and 2 is obtained by attaching a wiping cloth to a base-like member. In patent documents 1 and 2, the nonwoven fabric which uses a synthetic fiber as a raw material is employ | adopted for the wiping cloth which erases a diagram by touching a blackboard etc.

By the way, since the blackboard and white board known conventionally draw a diagram with white ink or a marker, there are few kinds of colors which can be drawn. In addition, with white ink and markers, shading and blurring cannot be expressed, and the art is not interesting. Therefore, a writing board that can draw a diagram with a path or the like is required, and the applicant has been researching and developing this type of writing board for some time.
In the course of this research, it was necessary to develop an eraser to erase the diagram drawn on the writing board.
The present invention has been developed under the circumstances described above, and an object of the present invention is to develop an eraser that can cleanly erase a line drawn on a writing board by a pass or the like.

  And in order to solve the above-mentioned subject, the present inventors made an experimental eraser using various materials, and repeated comparison examination. As a result, it was found that when the writing board was wiped with a nonwoven fabric made of pulp, the diagram disappeared cleanly.

  The invention according to claim 1 completed based on the above-described knowledge is an eraser for a writing board, which is composed of a nonwoven fabric made of pulp.

  The thickness of the eraser for a writing board in the dry state is preferably 0.5 mm to 1.0 mm, and the weight is desirably about 30 to 60 g per square meter (Claim 2).

When the thickness and the weight per unit area are less than the above ranges, the elasticity and cushioning properties are inferior, and the diagram drawn on the board cannot be sufficiently wiped off. Further, when the thickness and weight per unit area are less than the above ranges, a pass or the like may be attached to the hand when the board is wiped, which is inconvenient.
On the other hand, when the thickness and weight per unit area exceed the above range, it is difficult to use.

In addition, it is desirable to use the eraser for writing boards. Therefore, it is desirable to store a large number in a storage case and take it out in a pop-up manner.
The invention according to claim 3 developed from this point of view includes a storage case having an opening, and the writing board eraser according to claim 1 or 2 is folded and stored in the storage case. The writing board eraser is characterized in that when one sheet is taken out, the next sheet is pulled and pulled out, and a part thereof protrudes from the opening of the storage case.

The invention relating to a method for erasing a diagram is characterized by wiping the diagram drawn by a pass on a writing board having a coating layer on the surface with the eraser for a writing board according to any one of claims 1 to 3. And
Here, the diagram includes coloring as well as characters and figures.

  When the eraser of the present invention is used, the diagram drawn on the writing board can be erased cleanly. Further, according to the diagram erasing method of the present invention, a diagram drawn on a writing board with a path or the like can be erased cleanly.

Embodiments of the present invention will be further described below.
FIG. 1 is a perspective view of a housing case containing a large number of erasers according to an embodiment of the present invention. FIG. 2 is a perspective view of the eraser showing how the eraser stored in the storage case of FIG. 1 is folded. FIG. 3 is a perspective view of the writing board. 4 is an enlarged cross-sectional view of the vicinity of the surface of the writing board of FIG.

The eraser 1 of the present embodiment is particularly suitable for wiping off a diagram drawn with a pass on a writing board, and is folded and stored in a storage case 2 as shown in FIG. The storage case 2 is a substantially rectangular parallelepiped bag made of polyethylene resin or polypropylene resin, and has a cut (opening) 3 on the upper surface.
The eraser 1 of this embodiment is folded and stored in the storage case 2. When one sheet is taken out, the next one is pulled out and a part thereof protrudes from the cut 3 of the storage case 2. To do. That is, as shown in FIG. 2, when the eraser 1a is folded, a part of the lower eraser 1b is sandwiched inside. Therefore, when the upper eraser 1 a is pulled out from the storage case 2, a part of the next eraser 1 b moves with it and protrudes from the cut 3 of the storage case 2. Therefore, when the user picks up the eraser 1 a protruding from the storage case 2, a part of the next eraser 1 b protrudes from the storage case 2. Therefore, the user can easily remove the eraser 1 from the storage case 2.

The eraser 1 is made of a nonwoven fabric made of pulp. The eraser 1 is rectangular or square. The size of the eraser 1 is about 150 mm square to 300 mm square. The thickness of the eraser 1 is about 0.5 mm to 1.0 mm in a dry state.
The weight of the eraser in the dry state is about 30 to 60 g per square meter, more preferably 40 to 50 g.
The tensile strength of the eraser has directionality, and the tensile strength (dry state) when pulled in one direction is about 450 g / 25 mm, and the tensile strength when pulled perpendicularly (dry state) Is about 450 g / 25 mm.

The thickness of the eraser 1 in the wet state is about 0.4 mm to 0.6 mm.
In addition, the tensile strength of the eraser 1 in the wet state is about 248 g / 25 mm in the central portion and about 185 g / 25 mm in the side portion.

  The eraser 1 has the same physical and chemical properties as those commercially available as kitchen paper, and has the same thickness and weight per unit area as the kitchen paper.

The eraser 1 according to the present embodiment can be used without any trouble for wiping off a diagram drawn on a blackboard, a white boat, or the like. In particular, the surface coating layer 11 having a function of peeling an adhesive on the surface. It is recommended to be used for the purpose of wiping off the diagram drawn on the writing board 10 with good compatibility with the writing board 10 (FIGS. 3 and 4).
Of course, it is possible to wipe off a diagram drawn with white ink or a marker, but the eraser 1 of this embodiment is suitable for erasing the diagram drawn with the path 15.
Hereinafter, the writing board 10 and the path will be described.

The writing board 10 is provided with an undercoat layer 21 on a main body layer 20 made of resin, wood, metal or the like, and further a surface coating layer 11 provided thereon.
The surface coating layer 11 is a layer composed of a composition that has a property that it is difficult for the adhered matter to adhere to the surface and that the attached matter that has adhered to the surface is easily peeled off. It is dirty.
Specifically, it is a layer composed of a composition described in JP-A-9-100445, JP-A-2000-160132, JP-A-2000-119354, JP-A-2000-292870, and the like. .
More specifically, the surface coating layer 11 is made by applying a paint called anti-graffiti paint.
Paints called graffiti prevention paints include special silicone resin paints from SK Kaken Co., Ltd., “SK Hard Clean (registered trademark)”, and two-pack acrylic silicone resin paints from Kawakami Paint Co., Ltd. There is "Keshiso (product name)". A special silicone-modified fluororesin clear paint marketed under the name of “Magic Art (registered trademark)” by Dainippon Paint Co., Ltd. can also be used. Similarly, “Diafine”, a special silicone / fluororesin-based paint made by Hengwa Chemical Industry Co., Ltd., and “Evahard (registered trademark) No100 (S)”, a release silicone composite paint made by Ohashi Chemical Industry Co., Ltd. Can also be used to form the surface coating layer 11.

  The pass 15 is an art material typified by “Crepas (registered trademark)” manufactured by Sakura Crepas Co., Ltd., and generally contains a colorant, extender pigments, oil and wax. The colorant used in the pass is a pigment. Calcium carbonate is used as the extender pigment. As the oil, white mineral oil or No. 20 oil is used. As the wax, paraffin wax or carnauba wax is used.

Next, the usage method of the eraser 1 of this embodiment is demonstrated.
For example, an arbitrary picture or character is drawn on the writing board 10 shown in FIG. The writing board 10 has a surface coating layer 11 on the surface, and the surface has water slipperiness, water repellency, and antifouling properties, but the path 15 has good adhesion, and the writing board 10 has an arbitrary diagram. Can be drawn.
When it is desired to erase the diagram, the surface of the writing board 10 is wiped with the eraser 1 of the present embodiment. That is, the eraser 1 a protruding from the cut 3 of the storage case 2 is pinched and pulled out, and the eraser 1 a is taken out from the storage case 2. Then, the eraser 1a taken out is pressed against the surface of the writing board 10 as it is, and the diagram is wiped. As a result, the film of the path 15 attached to the surface of the writing board 10 is peeled off and wiped off by the eraser 1a.
That is, the eraser 1a of the present embodiment has moderate unevenness on the surface and has a considerable rigidity, so that the film of the path 15 attached to the surface of the writing board 10 can be easily peeled off.
Discard the used eraser 1. That is, in this embodiment, the eraser 1 is disposable.
To erase the diagram again, a new eraser 1 is taken out from the storage case 2.

  In the embodiment described above, a bag-like one is illustrated as the storage case, but a box-like one having higher rigidity may be used. Further, the cut 3 is disclosed as an example of the opening, but a larger opening may be used.

The eraser of the present invention was developed for the purpose of efficiently wiping a diagram drawn with a path on a writing board. However, according to experiments conducted by the present inventors, a diagram drawn with a marker on a white board. It can also be suitably used for wiping off.
That is, a diagram drawn with a marker on a whiteboard is wiped off with a known eraser, but an afterimage diagram may remain. On the other hand, when the eraser 1 of the present invention is used, the diagram can be erased more clearly than in the conventional case.

It is a perspective view of the storage case which stored many erasers of the embodiment of the present invention. FIG. 2 is a perspective view of an eraser showing how the eraser stored in the storage case of FIG. 1 is folded. It is a perspective view of a writing board. It is an expanded sectional view of the surface vicinity of the writing board of FIG.

Explanation of symbols

1 Eraser 2 Storage Case 3 Cut 10 Writing Board 11 Surface Coating Layer 15 Pass 20 Body Layer

Claims (4)

  An eraser for a writing board, characterized by comprising a nonwoven fabric made of pulp.   The eraser for a writing board according to claim 1, wherein the thickness in a dry state is 0.5 mm to 1.0 mm, and the weight is about 30 to 60 g per square meter.   A storage case having an opening is provided, and the eraser for a writing board according to claim 1 or 2 is folded and stored in the storage case. When one sheet is taken out, the next one is pulled out and pulled out. An eraser for a writing board, part of which protrudes from the opening of the storage case.   4. A diagram erasing method comprising wiping the diagram drawn by a pass on a writing board having a coating layer on the surface with the eraser for a writing board according to any one of claims 1 to 3.

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