JP2564438Y2 - Surface material for white marker pen board and board for white marker pen using the same - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the use of a felt pen for writing on a board (hereinafter referred to as a marker pen) using alcohol-based ink. Whiteboard etc. (hereinafter referred to as a board in this specification)
More particularly, the present invention relates to a board surface material suitable for drawing with a white marker pen and a board using the same.

[0002]

2. Description of the Related Art As a surface material of a board on which characters and the like are drawn on the surface using a marker pen, 1) It is easy to draw characters and the like (drawing properties are good, ink is applied well, and it is not blurred or blurred). ) Characters are easy to erase (erasability) 3) Characters are easy to see (clearness) 4) Excellent stain resistance (no dirt accumulates) 5) Durability (abrasion resistance) Excellent 6) Excellent weather resistance (chemical resistance) 7) Beautiful (aesthetic) properties are required.

Conventionally, enameled steel plates, painted steel plates, plastic boards, and the like have been used as surface materials for boards that satisfy such requirements. By the way, it is generally said that drawing white characters on a dark board is better in sharpness, especially in distinguishability from a long distance, than drawing dark characters on a white board. Marker pens were considered to be difficult to realize due to the problem of pigment hiding power and sedimentation, so conventionally manufactured and sold were limited to dark marker pens such as black, blue, red, etc.
In order to draw these clearly, it was necessary to use a white marker board. Recently, white marker pens have been manufactured and sold with a devised manufacturing method, but a board that can handle this has not yet been developed.

On the other hand, a so-called blackboard has been widely used as a dark board dedicated to chalk. Blackboards with low glossiness to avoid reflections from ceiling lights and bright windows, etc., satisfy the above characteristics, such as erasability and sharpness, but when writing with chalk or erasing There is a big problem that chalk powder is scattered and the fingertips, clothes, or the interior are stained, and improvement has been desired for a long time. Also, if you draw with a white marker pen on a conventional blackboard with low gloss, there is no dust generation and you can draw for the time being, but because the surface of the board is not smooth, you can erase the drawn characters etc. There is a practically fatal defect that it cannot be done, and it has not solved the problem.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and provides a clear color system suitable for a white marker pen in which characters and the like are clear, have good erasability, and are free from environmental pollution due to dust. The purpose is to realize a board.

[0006]

Means for Solving the Problems The surface material of the white marker pen board of the present invention has an L value of 40 or less in Lab colorimetric method and a surface gloss measured at an incident angle of 45 °. Gs (45 °) is 40 to 85%.

[0007]

[Work] The present inventors have studied the conditions for providing a dark board suitable for a white marker pen, and as a result of repeated experiments, have found that the color tone of the surface material, It has been found that there is an appropriate range for the glossiness of the surface material from the viewpoint of the lightness of the color specification and the erasability and stain resistance.

The Lab color solid scale most widely used among the quantitative colorimetric methods based on the UCS (Uniform Chromaticity Scale) color chromaticity diagram has an L value of lightness,
a and b indicate hues. As an appropriate range of lightness,
This L value needs to be 40 or less. FIG. 1 shows white marker pens A with different manufacturers and therefore slightly different hues on enamel boards of different brightness.
Characters and the like are drawn using three types B and C, and the results of judging the sharpness are shown in a graph. As shown in this figure, when the L value is 40 or more, the characters and the like by the marker pen become unclear. Conversely, as the L value is lower than 40, that is, as the color approaches black in a dark color system, the characters and the like by the white marker pen become clearer. This tendency slightly varies depending on the difference in the hiding power of the pigment contained in the ink of the marker pen. However, even with a white marker pen having the weakest hiding power, if the L value is 40 or less, characters and the like can be clearly identified.

The gloss of the surface is expressed as a value measured at an incident angle of 45 degrees among the specular gloss levels shown in JIS Z 8741, and it is preferable that Gs (45 °) = 40 to 85%. . In general,
In the case of a white board, the surface gloss (below, all 45
(Degree) is 90% or more, but in the case of a dark-colored board, if the glossiness is high, the background will be dark even at the same glossiness level, so the surface will be mirror-like and reflect the front one, It was recognized that the drawn letters and the like tended to be difficult to see.

It is generally recognized that the lower the surface gloss, the lower the erasability and stain resistance of characters and the like. Therefore, the present inventors created test pieces in which the surface gloss of the dark-colored board was variously changed, investigated the erasability of characters and the like with a marker pen, and simultaneously observed the difference in sharpness due to the difference in gloss. . FIG. 2 shows the results of the erasure test. This survey method uses three types of marker pens with different hues and counts the number of eraser erase operations until the character disappears completely for nine types of characters and the like in which the pressing pressure of the eraser is changed in three stages. The total for the same characters, etc., was defined as the “elimination index”.
For example, for all three colors, one under all pressure
The erasure index in the case where the character completely disappears by the number of times is 9 × 1 = 9, and the erasure index in the case where the six kinds of characters and the like disappear five times and the remaining three kinds of the characters and the like disappear six times is: , 6 × 5
+ 3 × 6 = 48. The range in which there is no practical problem in erasability is 20 or less in erasure index.

FIG. 2 shows that when the glossiness of the surface decreases, the erasability of the board tends to decrease. In order to set the extinction index to a value of 20 or less, which is considered to be no problem in practical use, the surface glossiness must be 40% or more. %, It was observed that the drawn characters and the like became slightly unclear, and that the surface glossiness became higher and more difficult to see. Therefore, it can be said that the surface glossiness suitable for a dark marker board is in the range of Gs (45 °) = 40 to 85%.

Generally, a board is formed by bonding a surface material to a backing material such as a plywood or a chip board.
As the surface material, a surface-treated steel plate such as an enameled steel plate or a coated steel plate, a coated metal plate such as an aluminum plate, a plastic board, or the like is used. The specific manufacturing method for controlling the lightness (L value) and the surface gloss within the above ranges is different depending on the type of the surface material. Regarding the surface glossiness, for example, in the case of enameled steel sheets, the composition of the glaze to be applied is a so-called matte material with low gloss by processing such as increasing the proportion of those with a melting point higher than the firing temperature to form an unmelted layer on the surface. It is generally known that an enamel layer can be realized.
According to Japanese Patent Publication No. 38, by limiting the component ratio of the glaze forming the enamel layer to a specific range, the molten enamel layer melted at 620 to 740 ° C is lost at a firing temperature of 700 to 850 ° C during firing. 50% gloss on a smooth, homogeneous and smooth surface
It is described that the following mat type enamel is formed on a metal substrate.

In the case of a coated steel plate, there are various commercially available paints whose gloss is adjusted by adding an undissolved material, and a desired surface gloss can be obtained by appropriately selecting these paints.

[0014]

EXAMPLE 1 An enameled steel sheet (SP) having a thickness of 0.3 mm
P), glaze with glaze of different color and lightness, and add undissolved material to the glaze, baked at 790 ° C for 2 minutes,
Ten kinds of surface materials having different color tone, lightness, and surface glossiness were obtained, and these were bonded to a plywood to prepare board samples.

For each sample, characters and the like were drawn using a commercially available white marker pen, and the sharpness was evaluated in four levels, and at the same time, the erasability and stain resistance of the characters and the like were investigated. The erasability was determined by the erasure index described above, and the stain resistance was evaluated by repeating the writing and erasing 40 times and observing dirt on the board surface. Table 1 shows the results.

[0016]

[Table 1]

For each of the lightness and the surface glossiness, those that match the appropriate ranges based on the above-mentioned findings are marked with *. Therefore, Samples 1 to 4 satisfying both the brightness and the surface gloss are examples of the present invention, and the others are comparative examples. By the way, the brightness of the board using a dark marker pen currently marketed as a white board is about 88 in L value, which is equivalent to sample 10, but even if a white marker pen is used, almost all characters can be read. Could not. In addition, it was found that the enameled steel board had almost no problem in erasability and stain resistance except for those having extremely low glossiness.

Example 2 A 0.3 mm-thick galvanized steel sheet (SGCC) was coated with an acrylic-melamine-based resin paint having a different color tone and lightness to which an undissolved substance was added.
Baking was performed at 170 ° C. for 20 minutes to obtain ten kinds of surface materials having different color tone, lightness, and surface glossiness, and these were adhered to a plywood plate to obtain board samples.

For each sample, characters and the like were drawn using a commercially available white marker pen, and the sharpness was evaluated on a four-point scale. At the same time, the erasability and stain resistance of the characters and the like were investigated. Table 2 shows the results.

[0020]

[Table 2]

For each of the lightness and the surface glossiness, those which conform to the appropriate ranges based on the above-mentioned findings are marked with *. Therefore, Samples 1 to 4 satisfying both the brightness and the surface gloss are examples of the present invention, and the others are comparative examples. Stain resistance of painted steel board is slightly inferior to enamel steel board with glassy surface,
Although some stains remained, it seems that there is no particular problem in normal use. Those having extremely low glossiness were poor in erasability.

[0022]

According to the present invention, there is an excellent effect that characters and the like are clear and have good erasability, and a dark board suitable for a white marker pen is realized.

[Brief description of the drawings]

FIG. 1 is a graph showing the effect of the present invention.

FIG. 2 is a graph showing the effect of the present invention.

Claims (4)

(57) [Scope of request for utility model registration] 1. A surface material of a board on which characters and the like are drawn on the surface with a marker pen, wherein the brightness of the surface material is 40 or less in L value in Lab colorimetry and measured at an incident angle of 45 °. A white marker pen board surface material characterized in that the obtained surface gloss Gs (45 °) is 40 to 85%. 2. The surface material for a white marker pen according to claim 1, wherein the surface material is an enameled steel plate. 3. The surface material is a painted thin steel plate.
A board material for a white marker pen according to the description. 4. A white marker pen board obtained by bonding the surface material according to claim 1 to a backing material.