JP2008290267A - Rubbing body, writing utensil and writing utensil set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubbing body, which can surely and easily thermally discolor a thermally discolorable image or handwriting by means of frictional heat. <P>SOLUTION: This rubbing body thermally discolors the thermally discolorable image or handwriting by means of the frictional heat developing through the rubbing of the thermally discolorable image or handwriting formed on a paper surface with a thermally discolorable ink. When let μ be a frictional coefficient between the rubbing body and the paper surface, W (N) be a load given normal to the paper surface by the rubbing body when the rubbing body rubs the thermally discolorable image or handwriting on the paper surface, V (m/s) be the speed of the rubbing body moving on the paper surface when the rubbing body rubs the thermally discolorable image or handwriting on the paper surface and A (cm<SP>2</SP>) be a contact area of the rubbing body coming into contact with the paper surface when the rubbing body rubs the thermally discolorable image or handwriting on the paper surface, the frictional coefficient μ, the load W, the speed V and the contact area A satisfy a relationship: (μ×W×V)/A≥4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a friction body capable of thermally discoloring a thermochromic image or handwriting with frictional heat, a writing instrument including the friction body, and a writing instrument set in which the friction body and the writing instrument are combined.

Conventionally, there are, for example, Reference 1 and Reference 2 regarding friction bodies having elasticity that changes an image or handwriting formed using reversible thermochromic ink from a first state to a second state by frictional heat.

JP 2004-148744 A JP 2006-123324 A

In the conventional friction body, when the thermochromic image or handwriting is rubbed with the friction body, the force applied to the friction body or the speed at which the friction body is moved is relatively small (for example, the elderly, women, children, etc. If used), there is a risk that the thermochromic image or handwriting cannot be reliably thermally discolored. Further, in the case of the conventional friction body, when the contact area between the friction body and the paper surface at the time of friction is set to be relatively large, there is a possibility that the thermochromic image or handwriting cannot be reliably thermally discolored.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a friction body capable of reliably and easily thermally discoloring a thermochromic image or handwriting with frictional heat. Another object of the present invention is to provide a writing instrument including a friction body capable of reliably and easily thermally discoloring a thermochromic image or handwriting with frictional heat, and a writing instrument set in which the friction body and the writing instrument are combined. To do.

The inventor of the present invention pays attention to the coefficient of friction between the friction body and the paper surface, the load applied to the friction body during friction, the moving speed of the friction body during friction, and the contact area of the friction body during friction. As a result of overlapping, it has been found that by satisfying the following relational expression, a thermochromic image or handwriting can be reliably and easily thermally discolored by frictional heat of a friction body.

1st invention of this application rubs the thermochromic image or handwriting formed on the paper surface using thermochromic ink, and heat-discolors the said thermochromic image or handwriting with the frictional heat which arises in that case A friction body, wherein a friction coefficient between the friction body and the paper surface is μ, and a vertical load applied to the paper surface by the friction body when the friction body rubs a thermochromic image or handwriting on the paper surface. W (N), V (m / s) is the speed at which the frictional body moves on the paper surface when the frictional body rubs a thermochromic image or handwriting on the paper surface. When the contact area where the frictional body is in contact with the paper surface when the thermochromic image or handwriting is rubbed is A (cm ² ), the friction coefficient μ, the load W, the speed V, and the contact area A are ,
(Μ × W × V) / A ≧ 4
It is a requirement to satisfy the relationship.

According to the friction body of the first invention, even when the force applied to the friction body and the speed at which the friction body is moved are relatively small, the thermochromic image or handwriting is reliably and easily thermally discolored by frictional heat. be able to.

The second invention of the present application rubs the thermochromic image or handwriting formed on the paper surface using the thermochromic ink, and thermally discolors the thermochromic image or handwriting by the frictional heat generated at that time. It is a friction body, and the vertical load applied to the paper surface by the friction body when the thermochromic image or handwriting on the paper surface is rubbed by the friction body is 4.9 N.
In addition, when the friction body is rubbed against a thermochromic image or handwriting on the paper surface and the speed at which the friction body moves on the paper surface is 0.5 m / s, the friction between the friction body and the paper surface The coefficient μ and the contact area A (cm ² ) where the friction body contacts the paper surface when the frictional body rubs a thermochromic image or handwriting on the paper surface,
μ / A ≧ 1.5
It is a requirement to satisfy the relationship.

According to the friction body of the second invention, even when the contact area between the friction body and the paper surface at the time of friction is relatively large, the thermochromic image or handwriting can be reliably and easily thermally discolored with frictional heat. it can.

A third invention of the present application rubs a thermochromic image or handwriting formed on a paper surface using a thermochromic ink, and thermally discolors the thermochromic image or handwriting by frictional heat generated at that time. A friction body, wherein a friction coefficient between the friction body and the paper surface is μ, and a vertical load applied to the paper surface by the friction body when the friction body rubs a thermochromic image or handwriting on the paper surface. W (N), V (m / s) is the speed at which the frictional body moves on the paper surface when the frictional body rubs a thermochromic image or handwriting on the paper surface. When the contact area where the frictional body is in contact with the paper surface when the thermochromic image or handwriting is rubbed is A (cm ² ), the friction coefficient μ, the load W, the speed V, and the contact area A are ,
(Μ × W × V) / A ≧ 15
It is a requirement to satisfy the relationship.

According to the friction body of the third invention, even when the force applied to the friction body and the speed at which the friction body is moved are relatively small, the thermochromic image or handwriting is reliably and easily thermally discolored by frictional heat. be able to.

According to a fourth aspect of the present invention, a thermochromic image or handwriting formed on a paper surface is rubbed using a thermochromic ink, and the thermochromic image or handwriting is thermally discolored by frictional heat generated at that time. It is a friction body, and the vertical load applied to the paper surface by the friction body when the thermochromic image or handwriting on the paper surface is rubbed by the friction body is 4.9 N.
In addition, when the friction body is rubbed against a thermochromic image or handwriting on the paper surface and the speed at which the friction body moves on the paper surface is 0.5 m / s, the friction between the friction body and the paper surface The coefficient μ and the contact area A (cm ² ) where the friction body contacts the paper surface when the frictional body rubs a thermochromic image or handwriting on the paper surface,
μ / A ≧ 6
It is a requirement to satisfy the relationship.

According to the friction body of the fourth aspect of the invention, even when the contact area between the friction body and the paper surface at the time of friction is relatively large, the thermochromic image or handwriting can be reliably and easily thermally discolored by frictional heat. it can.

The fifth invention of the present application requires a writing instrument comprising the friction body of the first to fourth inventions as a part of a writing instrument having a built-in thermochromic ink and capable of discharging the thermochromic ink. . According to the fifth aspect of the present invention, a thermochromic image or handwriting formed by a writing instrument can be reliably and easily thermally discolored by friction of a friction body provided in a part of the writing instrument.

The sixth invention of the present application requires a writing instrument set including the friction body according to the first to fourth inventions and a writing instrument that incorporates thermochromic ink and is capable of discharging thermochromic ink. In the sixth aspect of the present invention, the thermochromic image or handwriting formed by the writing instrument can be reliably and easily thermally discolored by the friction of the friction body combined with the writing instrument.

Unit In the first, second, third and fourth inventions, the unit of the load W is Newton (N), and the unit of the speed V is meter per second (m / s). The unit of the contact area A is square centimeter (cm ² ).

In the first and second inventions, the value of (μ × W × V) / A is preferably 2000 or less. In the third and fourth inventions, the value of μ / A is preferably 200 or less.

・ Friction coefficient μ
In the first, second, third, and fourth inventions, the friction coefficient μ of the friction body with respect to the paper surface is preferably selected from a range of 0.2 to 1.0.

The friction coefficient was written on paper A (former JIS P3201: chemical pulp) under the conditions of 100 mm / min and a load of 500 g (4.9 N) using a surface property measuring machine: HEIDON-14D manufactured by Shinto Kagaku Co., Ltd. The friction coefficient (friction force / load) when rubbing on high-quality paper made from 100% raw material, weighing range 40 to 157 g / m ² , whiteness 75.0% or more) was measured.

・ Friction body load W,
In the first, second, third, and fourth inventions, it is preferable that the friction body of the present invention manually performs a friction operation. When the friction body performs the manual friction operation, the friction body vertically applies to the paper surface. It is preferable that the direction load W is arbitrarily selected from the range of 1N to 10N.

・ Velocity of friction body V
In the first, second, third, and fourth inventions, when the friction operation is performed manually, the speed V at which the friction body moves on the paper surface is in the range of 0.1 m / s to 1.0 m / s (preferably Is preferably selected from the range of 0.1 m / s to 0.5 m / s.

・ Friction body contact area A
It said first, second, third, in the fourth invention, the contact area A between the friction body and the paper on ^the range (preferably ^{0.005cm 2 ~0.3cm 2, 0.01cm 2 ~0} . It is preferably selected from a range of 3 cm ² .

-Material of friction body In the first, second, third and fourth inventions, the material of the friction body may be any of glass, metal, stone, resin, etc., for example, silicone resin, styrene Resin (copolymer of styrene and butadiene, copolymer of styrene, ethylene and butadiene), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM), synthetic resin such as polypropylene and polyethylene Is preferred.

It is preferable that the friction body includes a thermochromic ink therein and is provided in a part of a writing instrument that can eject the thermochromic ink from the pen tip. The configuration in which the friction body is provided on a part of the writing instrument includes, for example, a configuration in which the friction body is provided on the side opposite to the pen tip of the writing instrument body, or a configuration in which the friction body is provided on the top of the removable cap on the pen tip side of the writing instrument body Etc. The friction body may be combined with a writing instrument that incorporates a thermochromic ink therein and discharges the thermochromic ink from a pen tip to form a writing instrument set. Further, the friction body may be configured to directly grip the outer peripheral surface during friction, or may be configured to grip the friction body via the friction body holder.

The pen tip of the writing instrument is, for example, a ball pen tip, a pen body made of a fiber processed body or a porous processed body, a pen body made of an extruded product of a synthetic resin having an axial capillary passage, and a metal plate having a slit at the tip. Examples thereof include a pen body and a brush pen body. Examples of the writing instrument include a direct liquid type in which thermochromic ink is directly accommodated, or a batting type in which a thermochromic ink is impregnated in an ink occlusion body.

-Thermochromic ink In the first, second, third and fourth inventions, the thermochromic ink is preferably a reversible thermochromic ink. The reversible thermochromic ink is a heat decoloring type that decolors by heating from a colored state, a color memory retaining type that reversibly stores and retains a colored state or a decolored state in a specific temperature range, or from a decolored state Various types such as a heating coloring type that develops color by heating and returns to a decolored state by cooling from the colored state can be used alone or in combination.

The coloring material contained in the reversible thermochromic ink includes conventionally known (a) electron donating color-forming organic compounds, (b) electron-accepting compounds, and (c) color reactions of both. A reversible thermochromic microcapsule pigment in which a reversible thermochromic composition containing at least three essential components of a reaction medium for determining the occurrence temperature of the microcapsule is preferably used.

In the present invention, as shown in FIG. 8, the shape of the curve plotting the change in color density due to the temperature change is opposite to the case where the temperature is raised from the lower temperature side than the color change temperature range, and from the higher temperature side than the color change temperature range. The color changes by following a different path depending on the descending state, and the color development state in the low temperature range below the complete color development temperature (t ₁ ) or the color erase state in the high temperature range above the complete color erase temperature (t ₄ ) It is preferable to apply a color memory retention type thermochromic ink that can be stored and retained in a specific temperature range [temperature range between t _{2 and} t ₃ (substantially two-phase retention temperature range)]. In FIG. 8, ΔH represents a temperature width (ie, hysteresis width) indicating the degree of hysteresis. When the value of ΔH is small, only one of the two states before and after the color change can exist. When the value of ΔH is large, it is easy to maintain each state before and after the color change.

In the first and second inventions, the discoloration temperature of the thermochromic ink friction body due to frictional heat is set to 25 ° C. to 95 ° C. (preferably 36 ° C. to 95 ° C.). That is, in the first invention and the second invention, the high temperature side discoloration point [complete decoloring temperature (t ₄ )] is set in a range of 25 ° C. to 95 ° C. (preferably 36 ° C. to 90 ° C.). It is effective to set the low temperature side discoloration point [complete color development temperature (t ₁ )] within a range of −30 ° C. to + 20 ° C. (preferably −30 ° C. to + 10 ° C.). Accordingly, it is possible to effectively maintain the color exhibited in the normal state (daily life temperature range), and it is possible to easily change the color of the image or handwriting by the reversible thermochromic ink by the frictional heat generated by the friction body.

In the third and fourth inventions, the discoloration temperature of the thermochromic ink friction body due to frictional heat is set to 40 ° C to 95 ° C (preferably 50 ° C to 95 ° C). That is, in the third and fourth inventions, the high temperature side color change point [complete decoloring temperature (t ₄ )] is set in a range of 40 ° C. to 95 ° C. (preferably 50 ° C. to 90 ° C.). It is effective to set the low temperature side discoloration point [complete color development temperature (t ₁ )] within a range of −30 ° C. to + 20 ° C. (preferably −30 ° C. to + 10 ° C.). Accordingly, it is possible to effectively maintain the color exhibited in the normal state (daily life temperature range), and it is possible to easily change the color of the image or handwriting by the reversible thermochromic ink by the frictional heat generated by the friction body.

The reversible thermochromic microcapsule pigment preferably has an average particle diameter in the range of 0.5 to 5.0 μm, preferably 1 to 4 μm. When the average particle diameter exceeds 5.0 μm, the outflow from the capillary gap of the ballpoint pen tip or the porous pen body decreases, and when the average particle diameter is 0.5 μm or less, it is difficult to show high density color development. .

The reversible thermochromic microcapsule pigment can be blended in an amount of 2 to 50% by weight (preferably 3 to 40% by weight, more preferably 4 to 30% by weight) based on the total amount of the ink composition. If it is less than 2% by weight, the color density is insufficient, and if it exceeds 50% by weight, the ink outflow is reduced and the writing property is impaired.

According to the present invention, a thermochromic image or handwriting can be easily and reliably thermally discolored.

<First Embodiment>
A first embodiment of the present invention will be described (see FIG. 1).
The present embodiment is a writing instrument 1 including a writing instrument body 2, a cap 6 that is detachable on the pen tip side of the writing instrument body 2, and a friction body 7 that is attached to the rear end of the writing instrument body 2. A thermochromic ink 4 is built in the writing instrument body 2, and the thermochromic ink 4 is ejected from the pen tip 3. By contact between the pen tip 3 of the writing instrument body 2 and the paper surface, a thermochromic image or handwriting is obtained on the paper surface. By rubbing the image or handwriting formed on the paper surface with the friction body 7, the thermochromic image or handwriting can be discolored thermally.

The writing instrument body 2 includes a pen tip 3 made of a ballpoint pen tip, a pen tip holder 22 with the pen tip 3 fixed to the front end, an ink containing cylinder 23 with the pen tip holder 22 fixed to the front end, and the ink It comprises a tail plug 24 provided with a vent hole attached to the rear end opening of the storage cylinder 23, and a shaft cylinder 21 for storing the ink storage cylinder 23 therein. Housed in the ink storage cylinder 23 are a thermochromic ink 4 and a follower 5 that is disposed at the rear end of the thermochromic ink 4 and moves forward as the thermochromic ink 4 is consumed.

A ball is rotatably held at the front end of the nib 3. A bullet 31 (coil spring) is accommodated in the nib 3, the ball is urged forward by the bullet 31, and the ball is placed on the inner surface of the inward front end edge of the nib 3. Press contact.

A nib seal member 61 made of a soft material is accommodated in the cap 6. When the cap 6 is mounted on the nib side, the nib 3 is in close contact with the nib seal member 61 and the nib 3 is sealed. The

The shaft cylinder 21 includes a front shaft 21a and a rear shaft 21b that are screwed together. The pen tip 3 protrudes from the front end hole of the shaft cylinder 21 (front shaft 21a). A friction body 7 made of a soft material is attached to the rear end hole of the shaft cylinder 21 (rear shaft 21b). An outward projection 71 is formed on the outer surface of the friction body 7, an inward projection 21 c is formed on the inner surface of the rear end hole of the shaft cylinder 21, and the outward projection 71 and the inward projection 21 c get over and lock. The friction body 7 can be prevented from falling out of the rear end hole.

<Second Embodiment>
A second embodiment of the present invention will be described (see FIG. 2).
The present embodiment is a writing instrument 1 including a writing instrument body 2, a cap 6 that is detachable on the pen tip side of the writing instrument, and a friction body 7 that is attached to the top of the cap 6. A thermochromic ink 4 is built in the writing instrument body 2, and the thermochromic ink 4 is ejected from the pen tip 3. By contact between the pen tip 3 of the writing instrument body 2 and the paper surface, a thermochromic image or handwriting is obtained on the paper surface. By rubbing the image or handwriting formed on the paper surface with the friction body 7, the thermochromic image or handwriting can be discolored thermally.

The writing instrument body 2 includes a pen tip 3 made of a ballpoint pen tip, a pen tip holder 22 with the pen tip 3 fixed to the front end, an ink containing cylinder 23 with the pen tip holder 22 fixed to the front end, and the ink It comprises a tail plug 24 provided with a vent hole attached to the rear end opening of the storage cylinder 23, and a shaft cylinder 21 for storing the ink storage cylinder 23 therein. Housed in the ink storage cylinder 23 are a thermochromic ink 4 and a follower 5 that is disposed at the rear end of the thermochromic ink 4 and moves forward as the thermochromic ink 4 is consumed. The shaft cylinder 21 includes a front shaft 21a and a rear shaft 21b that are screwed together. The pen tip 3 protrudes from the front end hole of the shaft cylinder 21 (front shaft 21a).

A ball is rotatably held at the front end of the nib 3. A bullet 31 (coil spring) is accommodated in the nib 3, the ball is urged forward by the bullet 31, and the ball is placed on the inner surface of the inward front end edge of the nib 3. Press contact.

A nib seal member 61 made of a soft material is accommodated in the cap 6. When the cap 6 is mounted on the nib side, the nib 3 is in close contact with the nib seal member 61 and the nib 3 is sealed. The A friction body 7 made of a soft material is attached to the top mounting hole of the cap 6.

<Third Embodiment>
A third embodiment of the present invention will be described (see FIG. 3).
The present embodiment is a writing instrument 1 including a writing instrument body 2, a cap 6 that is detachable on the pen tip side of the writing instrument body 2, and a friction body 7 that is attached to the rear end of the writing instrument body 2. A thermochromic ink 4 is built in the writing instrument body 2, and the thermochromic ink 4 is ejected from the pen tip 3. By contact between the pen tip 3 of the writing instrument body 2 and the paper surface, a thermochromic image or handwriting is obtained on the paper surface. By rubbing the image or handwriting formed on the paper surface with the friction body 7, the thermochromic image or handwriting can be thermally discolored.

The writing instrument body 2 includes a pen tip 3 made of a fiber processed body or a porous body, an ink tank 25 in which the pen tip 3 is attached to the front end portion so as to be movable back and forth, and pressing the pen tip 3 backward. It consists of a valve device 26 that opens, a shaft cylinder 21 that holds the rear portion of the ink tank 25, and a friction body 7 made of a soft material attached to the rear end portion of the shaft cylinder 21. A stirring member 41 is accommodated in the ink tank 25.

<Fourth embodiment>
A fourth embodiment of the present invention will be described (see FIG. 4).
The present embodiment is a writing instrument 1 including a writing instrument body 2, a cap 6 that is detachable on the pen tip side of the writing instrument body 2, and a friction body 7 that is attached to the rear end of the writing instrument body 2. A thermochromic ink is accommodated in the writing instrument body 2, and the thermochromic ink is discharged from the pen tip 3. By contact between the pen tip 3 of the writing instrument body 2 and the paper surface, a thermochromic image or handwriting is obtained on the paper surface. By rubbing the image or handwriting formed on the paper surface with the friction body 7, the thermochromic image or handwriting can be thermally discolored.

The writing instrument body 2 includes a nib 3 made of a fiber processed body or a porous body, a nib holder 22 for holding the nib 3, and the nib holder 22 at the front end and an ink occlusion body 27 inside. And the friction body 7 made of a soft member attached to the rear end portion of the shaft cylinder 21. The ink occlusion body 27 is made of a member having continuous pores (for example, a porous material such as a fiber processed body or a porous foam), and the ink occlusion body 27 is impregnated with thermochromic ink. The rear end portion of the pen tip 3 is connected to the front end portion of the ink storage body 27. The friction body 7 is attached to the outer surface of the rear end portion of the shaft cylinder 21 by fitting, or is formed integrally by two-color molding.

<Fifth embodiment>
A fifth embodiment of the present invention will be described (see FIG. 5).
The present embodiment is a writing instrument 1 having a pen tip 3 at the front end of the writing instrument body 2 and a friction body 7 at the rear end of the writing instrument body 2. A thermochromic ink 4 is accommodated in the writing instrument body 2, and the thermochromic ink 4 is discharged from the pen tip 3. By contact between the pen tip 3 of the writing instrument body 2 and the paper surface, a thermochromic image or handwriting is obtained on the paper surface. By rubbing the image or handwriting formed on the paper surface with the friction body 7, the thermochromic image or handwriting can be thermally discolored.

The writing instrument body 2 includes a pen tip 3 made of a ballpoint pen tip, a pen tip holder 22 for holding the pen tip 3, an ink reservoir 28 having the pen tip holder 22 at a front end, and the ink reservoir. And an ink tank 25 for storing the thermochromic ink 4 directly inside. The ink reservoir 28 is a member that is disposed between the nib 3 and the ink tank 25, and temporarily holds the overflow ink that accompanies the pressure increase in the ink tank 25. Is adopted. The friction body 7 is made of a soft material and is attached to the rear end hole of the ink tank 25.

<Sixth Embodiment>
A sixth embodiment of the present invention will be described (see FIGS. 6 and 7).
The present embodiment is a writing instrument set including a writing instrument 1 and a friction body 7.
A thermochromic ink 4 is built in the writing instrument 1, and the thermochromic ink 4 is discharged from the pen tip 3. By contact between the pen tip 3 of the writing instrument 1 and the paper surface, a thermochromic image or handwriting is obtained on the paper surface. By rubbing the image or handwriting formed on the paper surface with the friction body 7, thermal discoloration can be achieved.

The writing instrument 1 includes a writing instrument body 2 having a nib 3 at the front end and containing a thermochromic ink 4 therein, and a cap 6 detachably attached to the nib side of the writing instrument body 2.

The writing instrument body 2 includes a pen tip 3 made of a ballpoint pen tip, a pen tip holder 22 with the pen tip 3 fixed to the front end, an ink containing cylinder 23 with the pen tip holder 22 fixed to the front end, and the ink It comprises a tail plug 24 provided with a vent hole attached to the rear end opening of the storage cylinder 23, and a shaft cylinder 21 for storing the ink storage cylinder 23 therein. Housed in the ink storage cylinder 23 are a thermochromic ink 4 and a follower 5 that is disposed at the rear end of the thermochromic ink 4 and moves forward as the thermochromic ink 4 is consumed. The shaft cylinder 21 includes a front shaft 21a and a rear shaft 21b that are screwed together. The pen tip 3 protrudes from the front end hole of the shaft cylinder 21 (front shaft 21a).

A ball is rotatably held at the front end of the nib 3. A bullet 31 (coil spring) is accommodated in the nib 3, the ball is urged forward by the bullet 31, and the ball is placed on the inner surface of the inward front end edge of the nib 3. Press contact.

A nib seal member 61 made of a soft material is accommodated in the cap 6. When the cap 6 is mounted on the nib side, the nib 3 is in close contact with the nib seal member 61 and the nib 3 is sealed. The

The friction body 7 includes outward projections 71 on the outer surface made of a soft material. The friction body 7 is attached to the front end portion of the friction body holder 8. The friction body holder 8 has a cylindrical shape, and an inward projection 81 is formed on the inner surface of the front end portion. The inward projection 81 and the outward projection 71 get over and are locked, and the friction body 7 is prevented from falling off.

Table 1 shows a friction coefficient μ between the friction body and the paper surface, a constant vertical load W (N) applied to the paper surface by the friction body at the time of friction, and a constant speed V at which the friction body at the time of friction moves on the paper surface. (M / s), and a constant contact area A (cm ² ) where the frictional body in frictional contact with the paper surface is arbitrarily selected, and the value of (μ × W × V) / A and thermal discoloration under the conditions The test result about the thermochromic property when rubbing the handwriting of the thermochromic property by the property ink is shown. In this test, a total of four types of friction bodies made of styrene resin (2 types), silicone resin, and polypropylene were used. In this test, a thermochromic handwriting with a thermochromic ink having a color change temperature of 45 ° C. was rubbed with a plurality of types of friction bodies at an environmental temperature of 25 ° C.
The evaluation of thermochromic properties in the table is as follows.
◎: The handwriting was completely discolored ○: The handwriting was almost discolored △: The handwriting was slightly discolored ×: The handwriting was not discolored at all

Table 2 shows the constant load in the vertical direction applied to the paper surface by the friction body during friction at 4.9 N.
The constant speed at which the friction body moves on the paper surface during friction is 0.5 m / s, the friction coefficient μ between the friction body and the paper surface, and the constant contact area where the friction body contacts the paper surface during the friction. A (cm ² ) is arbitrarily selected, and the value of μ / A and the test result on the thermochromic property when rubbing the thermochromic handwriting with the thermochromic ink under the condition are shown. In this test, a total of four types of friction bodies made of styrene resin (2 types), silicone resin, and polypropylene were used. In this test, a thermochromic handwriting with a thermochromic ink having a color change temperature of 45 ° C. was rubbed with a plurality of types of friction bodies at an environmental temperature of 25 ° C.
The evaluation of thermochromic properties in the table is as follows.
◎: The handwriting was completely discolored ○: The handwriting was almost discolored △: The handwriting was slightly discolored ×: The handwriting was not discolored at all

Table 3 shows a friction coefficient μ between the friction body and the paper surface, a constant vertical load W (N) applied to the paper surface by the friction body during friction, and a constant speed V at which the friction body moves on the paper surface during friction. (M / s), and a constant contact area A (cm ² ) where the frictional body in frictional contact with the paper surface is arbitrarily selected, and the value of (μ × W × V) / A and thermal discoloration under the conditions The test result about the thermochromic property when rubbing the handwriting of the thermochromic property by the property ink is shown. In this test, a total of five types of friction bodies made of styrene resin (2 types), silicone resin, polypropylene, and iron were used. In this test, a thermochromic handwriting with a thermochromic ink having a color change temperature of 60 ° C. was rubbed with a plurality of types of friction bodies at an environmental temperature of 25 ° C.
The evaluation of thermochromic properties in the table is as follows.
◎: The handwriting was completely discolored ○: The handwriting was almost discolored △: The handwriting was slightly discolored ×: The handwriting was not discolored at all

Table 4 shows the constant load in the vertical direction applied to the paper surface by the friction body during friction at 4.9 N.
The constant speed at which the friction body moves on the paper surface during friction is 0.5 m / s, the friction coefficient μ between the friction body and the paper surface, and the constant contact area where the friction body contacts the paper surface during the friction. A (cm ² ) is arbitrarily selected, and the value of μ / A and the test result on the thermochromic property when rubbing the thermochromic handwriting with the thermochromic ink under the condition are shown. In this test, a total of four types of friction bodies made of styrene resin (2 types), silicone resin, and polypropylene were used. In this test, a thermochromic handwriting with a thermochromic ink having a color change temperature of 60 ° C. was rubbed with a plurality of types of friction bodies at an environmental temperature of 25 ° C.
The evaluation of thermochromic properties in the table is as follows.
◎: The handwriting was completely discolored ○: The handwriting was almost discolored △: The handwriting was slightly discolored ×: The handwriting was not discolored at all

It is a longitudinal cross-sectional view of the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the 4th Embodiment of this invention. It is a longitudinal cross-sectional view of the 5th Embodiment of this invention. It is a longitudinal cross-sectional view of the writing instrument of the 6th Embodiment of this invention. It is a longitudinal cross-sectional view of the friction body of the 6th Embodiment of this invention. It is explanatory drawing which shows the discoloration behavior of a heat decoloring type reversible thermochromic ink.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Writing instrument 2 Writing instrument main body 21 Shaft cylinder 21a Front shaft 21b Rear shaft 21c Inward protrusion 22 Pen tip holder 23 Ink storage cylinder 24 Tail plug 25 Ink tank 26 Valve device 27 Ink storage body 28 Ink storage body 3 Pen tip 31 Bullet 4 Thermochromic ink 41 Stirring member 5 Follower 6 Cap 61 Pen tip seal member 7 Friction body 71 Outward protrusion 8 Friction body holder 81 Inward protrusion

Claims (6)

A friction body that rubs a thermochromic image or handwriting formed on a paper surface using a thermochromic ink and thermally discolors the thermochromic image or handwriting by frictional heat generated at that time,
The friction coefficient between the friction body and the paper surface is μ,
W (N) is a vertical load applied to the paper surface by the friction body when rubbing the thermochromic image or handwriting on the paper surface with the friction body,
V (m / s) is the speed at which the friction body moves on the paper surface when rubbing the thermochromic image or handwriting on the paper surface with the friction body,
When the contact area where the friction body contacts the paper surface when the friction body rubs the thermochromic image or handwriting on the paper surface is A (cm ² ),
The friction coefficient μ, the load W, the speed V, and the contact area A are
(Μ × W × V) / A ≧ 4
A friction body characterized by satisfying the relationship of A friction body that rubs a thermochromic image or handwriting formed on a paper surface using a thermochromic ink and thermally discolors the thermochromic image or handwriting by frictional heat generated at that time,
A vertical load applied to the paper surface by the friction body when the frictional body rubs a thermochromic image or handwriting on the paper surface is 4.9 N.
And when the speed at which the friction body moves on the paper surface when the friction material rubs the thermochromic image or handwriting on the paper surface is 0.5 m / s,
The friction coefficient μ between the friction body and the paper surface, and the contact area A (cm ² ) where the friction body contacts the paper surface when the friction body rubs a thermochromic image or handwriting on the paper surface,
μ / A ≧ 1.5
A friction body characterized by satisfying the relationship of A friction body that rubs a thermochromic image or handwriting formed on a paper surface using a thermochromic ink and thermally discolors the thermochromic image or handwriting by frictional heat generated at that time,
The friction coefficient between the friction body and the paper surface is μ,
W (N) is a vertical load applied to the paper surface by the friction body when rubbing the thermochromic image or handwriting on the paper surface with the friction body,
V (m / s) is the speed at which the friction body moves on the paper surface when rubbing the thermochromic image or handwriting on the paper surface with the friction body,
When the contact area where the friction body contacts the paper surface when the friction body rubs the thermochromic image or handwriting on the paper surface is A (cm ² ),
The friction coefficient μ, the load W, the speed V, and the contact area A are
(Μ × W × V) / A ≧ 15
A friction body characterized by satisfying the relationship of A friction body that rubs a thermochromic image or handwriting formed on a paper surface using a thermochromic ink and thermally discolors the thermochromic image or handwriting by frictional heat generated at that time,
A vertical load applied to the paper surface by the friction body when the frictional body rubs a thermochromic image or handwriting on the paper surface is 4.9 N.
And when the speed at which the friction body moves on the paper surface when the friction material rubs the thermochromic image or handwriting on the paper surface is 0.5 m / s,
The friction coefficient μ between the friction body and the paper surface, and the contact area A (cm ² ) where the friction body contacts the paper surface when the friction body rubs a thermochromic image or handwriting on the paper surface,
μ / A ≧ 6
A friction body characterized by satisfying the relationship of A writing instrument comprising the friction body according to any one of claims 1 to 4 as a part of a writing instrument that contains a thermochromic ink and is capable of discharging the thermochromic ink. 5. A writing instrument set comprising the friction body according to claim 1 and a writing instrument that contains thermochromic ink and is capable of discharging thermochromic ink.

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