JP2017094526A - Thermochromic writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a core cotton type thermochromic instrument capable of reliably avoiding the color-fading of handwriting and capable of maintaining ink ejection performance stably over a long period even by storage and transport in a pen body upward state.SOLUTION: A thermochromic writing instrument 1 includes: a barrel 2; a pen body 3 fixed to a tip of the barrel 2; and an ink occlusion body 4 made of fiber bundle which is stored in the barrel 2, has one end thereof connected with a rear end part of the pen body 3 and allows an inner part thereof to be impregnated with thermochromic ink. The ink occlusion body 4 comprises a fine denier fiber bundle 41 and a thick denier fiber bundle 42 having a single fiber fineness larger than a single fiber fineness of the fine denier fiber bundle 41. Ink storing parts made of the thick denier fiber bundle 42 are dispersed and arranged on a plurality of portions in the fine denier fiber bundle 41.SELECTED DRAWING: Figure 1

Description

The present invention relates to a thermochromic writing instrument. Specifically, the present invention relates to a batting type thermochromic writing instrument in which an ink occlusion body is impregnated with a thermochromic ink.

Conventionally, in this type of thermochromic writing instrument, for example, Patent Document 1 discloses a thermochromic writing instrument in which a reversible thermochromic aqueous ink composition is impregnated in an ink occlusion body made of a fiber converging body.

JP 2011-38048 A

The thermochromic writing instrument of Patent Document 1 suppresses lightening of the handwriting even when stored and transported in a pen body upward state with a thermochromic aqueous ink composition having a specific composition. However, when the thermochromic writing instrument of Patent Document 1 employs a pen body (for example, a synthetic resin extrusion-molded pen body, a brush pen body, etc.) having a weak ink retention, the pen body is stored and transported in an upward state. Therefore, it is difficult to avoid lightening the handwriting.

The present invention solves the above-mentioned conventional problems, and reliably avoids lightening of handwriting even when stored and transported in a pen body upward state, and is a batting type that can maintain stable ink ejection properties over a long period of time. An object is to provide a thermochromic writing instrument.

In the present invention, “front” refers to the pen body side, and “rear” refers to the opposite side.

The first invention of the present application is a shaft cylinder 2, a pen body 3 fixed to the front end of the shaft cylinder 2, and accommodated in the shaft cylinder 2, and a rear end portion of the pen body 3 is connected to one end. A thermochromic writing instrument provided with an ink occlusion body 4 made of a fiber bundle impregnated with thermochromic ink inside, wherein the ink occlusion body 4 comprises a fine denier fiber bundle 41 and the fine denier fiber bundle. The thick denier fiber bundle 42 having a single yarn fineness greater than 41 single yarn fineness, and the ink reservoirs comprising the thick denier fiber bundle 42 are dispersedly arranged at a plurality of locations in the fine denier fiber bundle 41. Is a requirement.

In the thermochromic writing instrument 1 of the first invention, the ink occlusion body 4 includes a fine denier fiber bundle 41 and a thick denier fiber bundle 42 having a single yarn fineness larger than the single yarn fineness of the fine denier fiber bundle 41. The ink reservoirs comprising the thick denier fiber bundles 42 are distributed and arranged at a plurality of locations in the fine denier fiber bundle 41 so that the inside of the pen body 3 can be stored and transported in the pen body upward state. Even when the thermochromic ink is lowered, when writing with the pen body 3 facing downward, the thermochromic ink stored in the ink reservoirs at the plurality of locations is rapidly supplied to the pen body 3. For this reason, it is possible to reliably avoid the light color of the handwriting and maintain a stable ink ejection property over a long period of time.
If the ink reservoir is present only at one location in the fine denier fiber bundle 41, or if it does not exist, when the thermochromic ink inside the pen body 3 is lowered by storage or transportation in the pen body upward state, When writing with the pen body 3 facing downward, the thermochromic ink is not rapidly supplied to the pen body 3, and the handwriting may be lightened.

In the thermochromic writing instrument 1 of the second invention of the present application, the rear end portion of the pen body 3 is connected to the fine denier fiber bundle 41 of the ink occlusion body in the thermochromic writing instrument 1 of the first invention. It is a requirement.

In the thermochromic writing instrument 1 of the second invention, the rear end of the pen body 3 is connected to the fine denier fiber bundle 41 of the ink occlusion body 4 so that each ink reservoir can be used during writing. The thermochromic ink in the section can be smoothly supplied to the pen body 3 through the fine denier fiber bundle 41. It should be noted that at least a part of the rear end portion of the pen body 3 may be connected to the fine denier fiber bundle 41.

The third invention of the present application is that, in the thermochromic writing instrument 1 of the first or second invention, the cross-sectional shape of each ink reservoir is different.

In the thermochromic writing instrument 1 according to the third aspect of the invention, the storage state of the thermochromic ink in the ink occlusion body 4 is not uniform because the cross-sectional shape of each ink reservoir is different. When the body is faced downward, the ink is stably supplied to the pen body 3 sequentially from each ink reservoir. As a result, lightening of the handwriting can be avoided even by storing and transporting the pen body upward, and stable ink ejection properties can be maintained over a long period of time.

The thermochromic writing instrument of the present invention reliably avoids lightening of handwriting even when stored and transported in a pen body upward state, and obtains a batting type thermochromic writing instrument that can maintain stable ink ejection properties over a long period of time.

It is a longitudinal cross-sectional view of the writing instrument of embodiment of this invention. It is a longitudinal cross-sectional view of the state which removed the cap of FIG. It is a principal part enlarged view of FIG. It is the sectional view on the AA line of FIG. FIG. 4 is a sectional view taken along line BB in FIG. 3.

Embodiments of the writing instrument of the present invention will be described with reference to the drawings. (See FIGS. 1 to 5)

The thermochromic writing instrument 1 of the present invention includes a shaft tube 2, a pen body 3 fixed to the front end of the shaft tube 2, and is accommodated in the shaft tube 2 and connected to a rear end portion of the pen body 3. An ink occlusion body 4 and a cap 5 for sealing the pen body 3 of the shaft cylinder 2.

The shaft cylinder 2 includes a cylindrical front shaft 21 to which the pen body 3 is fixed at the front end, and a bottomed cylindrical rear shaft 22 to which the rear end opening of the front shaft 21 is coupled. . The front shaft 21 and the rear shaft 22 are obtained by injection molding of synthetic resin. The front shaft 21 and the rear shaft 22 are coupled by press-fitting or screwing.

A front step 21a is integrally formed on the inner wall of the front shaft 21, and the front end of the ink storage body 4 is brought into contact with the front step 21a. A rear side step portion 22a is integrally formed on the inner wall of the rear shaft 22, and a rear end of the ink storage body 4 is brought into contact with the rear side step portion 22a. The front step 21a and the rear step 22a are formed by ends of a plurality of ribs extending in the axial direction.

A front end portion of the front shaft 21 is formed in a tapered shape, and a mounting hole 21b is formed through the front end. The pen body 3 is press-fitted and fixed in the mounting hole 21b. The pen body 3 is press-fitted and fixed to the mounting hole 21b through the support member 31, but may be directly press-fitted and fixed to the mounting hole 21b. An air passage capable of communicating with the outside air is formed on the outer surface of the pen body 3 and the inner surface of the mounting hole 21b or on the outer surface of the support member 31 and the inner surface of the mounting hole. Further, an air passage that can communicate with the outside air is formed between the outer surface of the ink occlusion body 4 and the inner surface of the shaft cylinder 2 (the inner surface of the front shaft 21 and the inner surface of the rear shaft 22).

Ink occlusion body The ink occlusion body 4 comprises a synthetic resin fiber bundle (for example, a polyester fiber bundle) and a cylindrical outer skin 43 surrounding the outer periphery thereof. The outer skin 43 is made of a synthetic resin cylindrical body (for example, an extruded body of polypropylene resin). The ink occlusion body 4 is impregnated and held with thermochromic ink.

The synthetic resin fiber bundle includes a fine denier fiber bundle 41 and a plurality of thick denier fiber bundles 42 having a single yarn fineness larger than the single yarn fineness of the fine denier fiber. The single yarn fineness of the fine denier fiber bundle 41 of the present embodiment is selected from the range of 2 to 4 denier, and the single yarn fineness of the thick denier fiber bundle 42 is selected from the range of 15 to 20 denier. The thick denier fibers are dispersedly arranged at a plurality of locations (specifically, 2 to 6 locations) in the fine denier fiber bundle 41. The thick denier fiber bundle 42 has a relatively large gap, and the fine denier fiber bundle 41 has a relatively small gap. The thick denier fiber bundle 42 constitutes an ink reservoir for holding a large amount of ink, and the fine denier fiber bundle 41 constitutes an ink connecting portion for connecting the ink reservoirs to each other. Each thick denier fiber bundle 42 is surrounded by the fine denier fiber bundle 41. Each of the ink reservoirs formed of the thick denier fibers has a different cross-sectional shape.

Further, each of the thick denier fiber bundles 42 (ink reservoirs) is dispersedly arranged in a portion radially away from the axis of the ink occlusion body 4, and at least the ink to which the rear end portion of the pen body 3 is connected. The fine denier fiber bundle 41 is located at the axial center of the occlusion body 4. Each of the ink reservoirs formed by the thick denier fiber bundle 42 is in contact with the inner surface of the outer skin 43. Each of the thick denier fiber bundles 42 is pressed against the inner surface of the outer skin 43 by being pressed radially outward by the fine denier fiber bundles 41, and the thick denier fiber bundles 42 in the ink occlusion body 4. Movement is prevented.

The ratio of the occupied sectional area of the thick denier fiber bundle 42 to the occupied sectional area of the entire fiber of the ink occlusion body 4 is set in the range of 35% to 60% (preferably 50% to 60%). By the said range, the appropriate amount of ink discharge property stable can be obtained. When the ratio of the occupied cross-sectional area of the thick denier fiber bundle 42 to the occupied cross-sectional area of the entire fiber of the ink occlusion body 4 is smaller than 35%, the ink ejection from the pen body 3 becomes insufficient, while If the occupied cross-sectional area of the thick denier fiber is larger than 60% of the occupied cross-sectional area of the entire 4 fibers, the ink ejection property from the pen body 3 becomes excessive.

-Pen body The said pen body 3 is obtained by the extrusion molding body of a synthetic resin, or the resin processed body of a fiber. The pen body 3 made of an extruded product of the synthetic resin has a plurality of ink outlet holes extending in the axial direction having a capillary force. The pen body 3 made of the processed fiber is provided with an ink lead-out path composed of a capillary gap, and the front end is formed in a brush shape.

The rear end portion of the pen body 3 is pierced and connected to the front end portion of the ink storage body 4. The rear end portion of the pen body 3 is connected to a fine denier fiber bundle 41 of the ink occlusion body 4. In order to prevent excessive discharge of the thermochromic ink from the pen body 3, the rear end portion of the pen body 3 is preferably not connected to the thick denier fiber bundle 42 of the ink occlusion body 4.

Cap The cap 5 includes a cylindrical outer cap 51 and a bottomed cylindrical inner cap 52 fixed to the inner surface of the outer cap 51. The outer cap 51 is detachably fitted to the outer surface of the intermediate portion of the shaft tube 2 (the outer surface of the front shaft 21), and the inner cap is attached to the outer surface of the front end portion of the shaft tube (the outer surface of the front end portion on the front shaft). Airtight fit. A friction body 6 made of an elastic material (for example, SEBS resin, silicone resin) is fixed to the top of the cap 5 (the top of the outer cap 51). When the handwriting of the thermochromic ink on the paper surface is rubbed by the friction body 6, the handwriting of the thermochromic ink can be discolored by frictional heat generated during the friction. The friction body 6 can be fixed to the rear end of the shaft cylinder 2.

・ Thermochromic ink The thermochromic ink is a thermochromic microcapsule pigment, (a) an electron-donating color-forming organic compound, (b) an electron-accepting compound, and (c) both of the above. A water-based ink composition containing a reversible thermochromic microcapsule pigment encapsulating a reversible thermochromic composition comprising a reaction medium that determines the occurrence temperature of the color reaction is employed. Examples of the thermochromic ink include a type that is decolored by heating or a type that develops color by heating. Instead of the thermochromic ink, general pigments (carbon black, inorganic pigments, organic pigments), fluorescent pigments, white pigments such as titanium dioxide, pearl pigments, cholesteric liquid crystal-type glitter pigments, photochromic compositions, By impregnating the ink occlusion body 4 employed in the present application with a microcapsule pigment containing a fragrance or the like, it is possible to reliably avoid lightening of the handwriting even when stored and transported in a pen body upward state. It is possible to obtain a batting type writing instrument whose dischargeability can be maintained for a long time.

In the thermochromic writing instrument 1 of the present embodiment, the ink occlusion body 4 has a fine denier fiber bundle 41 and a thick denier fiber bundle 42 having a single yarn fineness larger than the single yarn fineness of the fine denier fiber bundle 41. The ink reservoirs composed of the thick denier fiber bundles 42 are dispersed and arranged at a plurality of locations in the fine denier fiber bundle 41, so that the pen body 3 can be stored and transported in an upward state. Even when the thermochromic ink inside the ink cartridge 3 falls, when writing with the pen body 3 facing downward, the thermochromic ink stored in the plurality of ink reservoirs is quickly supplied to the pen body 3. Therefore, even when a pen body with weak ink holding power (for example, a pen body made of a synthetic resin extruded body or a fiber resin processed body) is employed, lightening of the handwriting is avoided and stable ink ejection is achieved. Sex over the long term It can be maintained.

The thermochromic writing instrument 1 of the present embodiment is configured such that the rear end portion of the pen body 3 is connected to the fine denier fiber bundle 41 of the ink occlusion body 4 so that the thermochromic ink is penned during writing. 3 can be supplied smoothly.

The thermochromic writing instrument 1 of the present embodiment is different in the cross-sectional shape of each ink reservoir, so that the reservoir state of the thermochromic ink is not uniform. Ink is stably supplied to the pen body 3 sequentially from the ink reservoir. As a result, lightening of the handwriting can be avoided even by storing and transporting the pen body 3 upward, and stable ink ejection properties can be maintained over a long period of time.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Shaft cylinder 21 Front shaft 21a Front side step part 21b Mounting hole 22 Rear shaft 22a Rear side step part 3 Pen body 31 Support member 4 Ink occlusion body 41 Fine denier fiber bundle 42 Thick denier fiber bundle 43 Outer skin 5 Cap 51 Outer cap 52 Inner cap 6 Friction body

Claims (3)

A shaft tube, a pen body fixed to the front end of the shaft tube, a fiber bundle that is accommodated in the shaft tube, a rear end portion of the pen body is connected to one end, and a thermochromic ink is impregnated therein A thermochromic writing instrument comprising an ink occlusion body made of
The ink occlusion body includes a fine denier fiber bundle and a thick denier fiber bundle having a single yarn fineness larger than the single yarn fineness of the fine denier fiber bundle, and the thick denier fiber bundle has a plurality of the thick denier fiber bundles at a plurality of locations. A thermochromic writing instrument characterized in that ink reservoirs made of denier fiber bundles are dispersedly arranged. The thermochromic writing instrument according to claim 1, wherein a rear end portion of the pen body is connected to a fine denier fiber bundle of the ink occlusion body. The thermochromic writing instrument according to claim 1 or 2, wherein each ink reservoir has a different cross-sectional shape.

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