JP2002002175A - Pen set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pen set enabling double check surely upon checking the entry items in a document or the like through double checking by a method wherein the color of a mark upon a first checking can be changed upon a second checking so as not to allow any omission of the checking. SOLUTION: Blue aqueous ink A containing a pH indicator of bromthymol blue and sodium carbonate is prepared to obtain a pen A by filling the ink. Aqueous ink B containing sulfamic acid is prepared and another pen B is obtained by filling the same. A blue mark is written by the pen A and, thereafter, rewriting is applied on the blue mark by the pen B whereby the color of the mark is changed into yellow.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pen set used for, for example, checking test items on a test sheet and a display method using the pen set. It was done.

[0002]

2. Description of the Related Art In a certain kind of qualification test, in order to prevent an omission of each test item on an answer sheet, the examinee uses a fluorescent color pen or a color pencil of a plurality of different colors for each item. A check is made by attaching a mark to. This check is not only performed once,
In order to prevent check omission, it is preferable to perform double check, that is, double check.

In performing the double check, if the color of the mark added earlier changes, the check location can be more reliably confirmed, and the omission of the check can be more completely prevented. However, a writing instrument for checking that conforms to such a checking method has not been conventionally known.

[0004]

Therefore, an object of the present invention is to perform such a double check, etc.
An object of the present invention is to provide a writing instrument that can change the color of a mark by the first check at the time of the second check so that there is no check omission, and that can reliably perform the double check.

[0005]

The object of the present invention is to provide an ink A
A pen set having a pen A filled with the ink B and a pen B filled with the ink B, wherein the color of a mark obtained by writing the ink A changes color with a pH change, Ink B can be solved by using a pen set that changes the pH and changes the color of the mark when the ink is rewritten on the mark written with ink A.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
The pen set of the present invention includes a combination of a pen A and a pen B. Specifically, a plurality of pens A-1 having different writing colors,
.. And a single pen B. Pen A is filled with ink A, and pen B is filled with ink B. The pen holder and the pen tip constituting the pen A and the pen B are not limited, and for example, those used for ordinary coloring pens, fluorescent coloring pens and the like can be used.

Hereinafter, the ink A will be described. The ink A is an aqueous type in which the color of a mark obtained by writing on the ink A changes color with a change in pH as described above. Is mentioned. An essential component is a discoloring colorant that changes color due to a change in pH. An essential component comprising a discoloring colorant that changes color due to a change in pH and a pH adjuster A that makes the ink A acidic or alkaline. An essential component is a discoloring colorant that changes color by a pH change and a non-changing colorant that does not change color by a pH change. An essential component comprising a discoloring colorant that changes color by a pH change, a non-changing colorant that does not change color by a pH change, and a pH adjuster A that makes the ink A acidic or alkaline.

[0008] As a discoloring colorant that changes color by a change in pH (hereinafter referred to as a discoloring colorant), a dye known as a pH indicator (acid-base indicator) is typically used, and specifically, bromthymol. Blue, uranine (fluorescein), pyranine, methyl orange, methyl red, alizanin, falephthalein, congo red and the like. Examples of the pH adjusting agent A include sulfamic acid, salicylic acid, and ascorbic acid, which make the ink A acidic, and sodium carbonate, potassium carbonate, and the like, which keep the ink A alkaline.
Sodium stearate or the like is used.

Further, non-color-change colorants which do not change color due to pH change include C.I. I Acid Red 8, C.I. Water-soluble dyes such as I Direct Blue 87 and CI Acid Yellow 23 are used. The amount of the discoloring colorant in the ink A is 0.1 to 5 parts with respect to 100 parts of water (parts by weight, the same applies hereinafter), and the amount of the pH adjuster A is 100 parts of water.
The amount is 1 to 5 parts per part, and the blending amount of the invariant colorant is 1 to 5 parts per 100 parts of water.

In the ink A, besides the above-mentioned essential components, a drying inhibitor consisting of glycols such as polythylene glycol, ethylene glycol, glycerin and the like is used in water 10.
5 to 15 parts per 0 parts, 0.05 to 1 part of a fungicide such as antimycin A per 100 parts of water, and a surfactant such as potassium oleate and sorbitan monostearate to 100 parts of water. On the other hand, 0.1 to 5 parts can be blended, and by such blending, required writing characteristics, for example, drying property and preservability of the ink A can be obtained.

The four types of formulation of the ink A are as follows: the discoloration pH range of the discoloring colorant used, the solubility of the discoloring colorant, and the ink A
(For example, the time from the first writing with the ink A to the second writing with the ink B), the paper quality of the paper to be written (neutral paper, woodfree paper, acidic paper, etc.) Although it is appropriately selected in consideration of the factors, usually, a mixture of the discoloring colorant and the pH adjuster A as essential components, and the above-mentioned optional components blended therein is mainly employed.

Next, the ink B will be described. The ink B is an aqueous ink that changes the pH of the mark when the ink B is rewritten on the mark written with the ink A to change the color of the mark, and holds the ink B on the alkaline side or the acidic side. PH adjusting agent B as an essential component. As the pH adjuster B, a compound that keeps the ink B acidic when the ink A is alkaline, and a compound that keeps the ink B alkaline when the ink A is acidic is used.

For this reason, the same type of pH adjuster B as the pH adjuster A is specifically used, for example, sodium carbonate, potassium carbonate, sodium stearate, sulfamic acid, salicylic acid, ascorbic acid, stearic acid and the like. Is used. The amount of the pH adjuster B is 10
It is 5 to 20 parts for 0 part. In the ink B, in addition to the pH adjuster B, 5 to 30 parts of a drying inhibitor such as ethylene glycol, polyethylene glycol or glycerin as an optional component and 100 parts of water,
About 0.1 to 5 parts per 100 parts and about 0.1 to 5 parts of a surfactant per 100 parts of water can be blended. Usually, it is preferable to use a drying inhibitor in combination.

Next, an example in which such a method of using a pen set is applied to a check of a test answer sheet will be described. First, the examinee makes a mark at the time of answering each test item on the test answer sheet using a plurality of pens A-1, pen A-2,... For example, item (1) has a green mark, item (2) has a blue mark, item (3)
Is marked with an orange mark.

Next, before the test is completed, the examinee checks whether or not the examinee has answered each item and re-writes on the mark with the pen B to trace the mark. Then, the pH of the mark changes from acidic to alkaline or from acidic to alkaline, and the color of the mark changes due to this pH change. The green mark of item (1) becomes yellow, for example, and the blue mark of item (2) becomes For example, the color changes to yellow, and the orange mark of item (3), for example, yellow. In this way, it is possible to confirm whether there is no omission of the answer by changing the mark attached to each item to yellow.

In such a method of use, the time from writing of the mark by pen A to rewriting by pen B is 3 to 3 hours.
Since the time is as long as 6 hours or more, it is necessary to prevent discoloration of the mark by pen A due to air oxidation during this time. Further, depending on the paper to be written such as the answer sheet, the paper itself may show acidity, and it is necessary to prevent the mark by the pen A from being discolored. For this purpose, the ink A
This can be achieved by appropriately selecting and setting the type and blending amount of the discoloring colorant, the non-discoloring colorant, and the pH adjuster A used in the method.

As another method of using the pen set, it can be used when two persons separately double-check the contents described in the document. First, 1
The first person checks the contents of the description individually, and marks with pen A. Then, another second checker checks the written contents in the same manner, and rewrites with pen B on the mark attached with pen A. As a result, since the color of the mark has changed, it is possible to confirm that the content of the mark has been double-checked, thereby preventing omission of the check.

Further, when a mark of a different color is provided by using a plurality of pens A of different colors, and the color of the mark is changed by rewriting with the pen B, the colors of the changed marks are all the same. In this method, it is possible to know at a glance whether or not a double check is performed, which is preferable.

Hereinafter, specific examples will be described. Pen A-1 As ink A-1, 1 part of bromthymol blue, 4 parts of sodium carbonate, and 8 parts of ethylene glycol were added to 100 parts of water.
Parts, 1 part of fungicide and 1 part of surfactant, pH1
A blue ink A-1 of 0.0 was prepared and filled to obtain a pen A-1.

Pen A-2 Ink A-2 was prepared by mixing 4 parts of uranine, 8 parts of ethylene glycol, 1 part of a fungicide, and 1 part of a surfactant in 100 parts of water to form an orange ink having a pH of 10.0. A-2 was prepared and filled to obtain a pen A-2.

Pen A-3 As ink A-3, C.I. I Acid Yellow 23 0.5 parts, Bromthymol Blue 0.5 parts,
2 parts sodium carbonate, 3 parts pyranine, 8 parts glycerin,
1 part of a fungicide and 1 part of a surfactant are blended to give a pH of 10.
A green ink A-3 was prepared and filled to obtain a pen A-3.

Pen B As ink B, 100 parts of water, 20 parts of sulfamic acid,
A colorless pH 1.0 ink B was prepared by blending 20 parts of ethylene glycol, 1 part of a fungicide, and 1 part of a surfactant.
This was filled into Pen B.

Using a pen A-1, a pen A-2 and a pen A-3, three kinds of marks of blue, orange and green were made on neutral paper. This was allowed to stand in a room for 8 hours, and no discoloration was observed for any of the marks. Then, using pen B, re-writing on each mark,
The color of each mark immediately changed to yellow, and the discolored yellow mark was stable for 6 hours in the room thereafter, and no discoloration was observed.

[0024]

As described above, according to the present invention,
By using the pen A and the pen B to re-write with the pen B on the colored mark obtained by writing with the pen A, the color of the mark can be changed. For this reason, it is possible to easily and reliably perform a check such as confirmation of a written item of a document or the like and a double check by visual observation.

Claims (5)

[Claims] 1. A pen A filled with an ink A and a pen B filled with an ink B, wherein the color of a mark obtained by writing on the ink A changes color with a change in pH. A pen set, wherein, when ink B is rewritten on a mark written with ink A, the pH is changed to change the color of the mark. 2. The pen set according to claim 1, wherein the ink A contains a discoloring colorant that changes color by a pH change, or a color changing colorant that changes color by a pH change and a pH adjuster A that makes the ink A acidic or alkaline. 3. The pen set according to claim 1, wherein the ink B contains a pH adjuster B for making the ink B acidic or alkaline. 4. The pen set according to claim 1, wherein the discoloring colorant is a pH indicator. 5. The pen according to any one of claims 1 to 4, wherein the pen A according to any one of claims 1 to 4 is used to write and mark a writing object, and the pen according to any one of claims 1 to 4 is placed on the mark. A rewriting method using B to change the mark color.