JP7100461B2 - Stationery - Google Patents

Description

The present invention relates to a writing tool having a pen tip capable of visually recognizing the writing direction, and more specifically, a pen having maximum ink outflow property and an effective area of a visual recognition portion capable of visually recognizing the writing direction with respect to the entire pen tip. Regarding writing tools with a nib.

Conventionally, the pen tip of a writing instrument called a paint marker, an underline marker, etc. is provided with a wide pen core to enable wide line drawing, and is excellent in marking visibility and workability. Therefore, it is widely used.
The pen tip of a writing instrument such as a line marker is generally a rod-shaped bundle of synthetic resin fibers or the like, or a shaft body that is a writing instrument body by imparting a capillary action to a porous member such as a polymer sintered body. Writing is possible by deriving the ink supplied from the pen tip to the pen tip.

In addition, with the spread of writing instruments in which fluorescent ink is housed in the shaft body, which is the main body of the writing instrument, writing instruments using pen tips with many structures and shapes that enable wide line drawing have become commercially available, and are used by users. It is possible to select a wide range of writing instruments according to the situation, and the workability is also comfortable.

The applicant applies to a writing instrument having a writing core that can guide and hold ink supplied from a shaft body that is the main body of the writing instrument, and has a writing instrument having a visual recognition portion (visible portion) at the pen tip so that the writing direction can be visually recognized. It is disclosed (see, for example, Patent Document 1).
Since the pen tip of this type of writing instrument can visually recognize the writing part, it can be stopped at the part where the end of pulling is desired to be stopped, and it is possible to prevent excessive pulling or protrusion. The specific configuration of the pen tip is a sintered core composed of an ink guiding portion and a writing portion for guiding ink, a holding body for holding the sintered core, and the sintered core and the holding body. It consists of an adhesive to fix.

However, since the shape of this pen tip is complicated, a sintered core obtained by sintering thermoplastic resin particles is used. However, since the ink flow path of the sintered core is meandering, the porosity On the other hand, there is a problem that the ink outflow property is slightly low. Therefore, it is necessary to design the ink guiding portion to be thick, and there is a problem that the effective area of the visual recognition portion with respect to the entire pen tip is low.

On the other hand, as prior arts such as a pen tip having a visual recognition portion capable of visually recognizing a writing direction other than the above structure, a writing tool using the pen tip, and a pen tip disclosing the proximity technique of the present invention, for example, a pen. The tip includes a porous body to be a writing portion and a holding body that holds the porous body and has at least one ink guiding portion for supplying ink to the writing portion, and the ink contained in the writing tool main body is used as described above. A writing tool having a relay porous body for supplying to an ink guiding portion provided on the holding body, and the holding body is a visual recognition part capable of visually recognizing the writing direction, and the area ratio of the visual recognition part is the writing tool. A writing tool (see, for example, Patent Document 2) characterized in that it is 40% or more of the pen tip protruding from the tip of the main body is known.

However, the writing tool using the pen tip described in Patent Document 2 does not have an air replacing action or the like in the ink guiding portion, and the technical idea is different from that of the present invention.

Japanese Unexamined Patent Publication No. 2000-52682 (Claims, FIG. 1, etc.) Japanese Unexamined Patent Publication No. 2012-20575 (Claims, FIG. 1, etc.)

The present invention has been made in view of the above-mentioned problems of the prior art, and is intended to solve this problem. In a writing tool having a pen tip capable of visually recognizing the writing direction, the ink outflow property and the writing direction with respect to the entire pen tip are determined. It is an object of the present invention to provide a writing tool having a pen tip that maximizes the effective area of a visible portion that can be visually recognized.

As a result of diligent studies to solve the above-mentioned conventional problems, the present inventors have provided a pen tip having a visual recognition portion capable of guiding the ink supplied from the writing tool main body and visually recognizing the writing direction. It is a writing tool, and the pen tip is composed of at least a writing part and a holding body having a visual recognition part, and by making the holding body a specific structure or the like, it has been found that the writing tool of the above purpose can be obtained. The invention was completed.

That is, the writing tool of the present invention is a writing tool having a pen tip having a visual recognition portion capable of guiding ink supplied from the writing tool main body and visually recognizing the writing direction, and the pen tip is at least the writing unit. And a holding body having a visual recognition portion, the holding body is characterized in that an ink guiding portion having a slit shape is formed. The "slit" in the present invention described here means an elongated hole having a different aspect ratio.
It is preferable that the ink guiding portion is formed inside the holding body and is composed of an ink portion and an air replacement portion.
It is preferable that the opening of the ink guiding portion is in contact with the air replacement portion.

According to the present invention, there is provided a writing instrument that maximizes the ink outflow property and the effective area of the visual recognition portion capable of visually recognizing the writing direction with respect to the entire pen tip.

It is a drawing which shows an example of embodiment of the writing instrument of this invention, (a) is a front view, (b) is a vertical sectional view. It is each drawing which shows an example of the pen tip used for the writing tool of this invention, (a) is a perspective view seen from the front side, (b) is a plan view, (c) is a perspective view seen from the rear side, (d). ) Is a left side view, (e) is a front view, (f) is a right side view, (g) is a DD line sectional view of (e), (h) is a vertical sectional view, and (i) is (g). ) Is an enlarged view of the main part. 2 views of the holding body, (a) is an enlarged left side view, (b) is a plan view, (c) is an enlarged right side view, (d) is a front view, and (e) is from the front side. The enlarged partial perspective view as seen, (f) is a vertical sectional view, (g) is a GG line sectional view of (d), and (h) is an enlarged view of a main part of (a). It is each drawing which shows the other example of the pen tip used for the writing tool of this invention, (a) is a perspective view seen from the front side, (b) is a plan view, (c) is a perspective view seen from the rear side, ( d) is a left side view, (e) is a front view, (f) is a right side view, (g) is a BB line sectional view of (e), (h) is a vertical sectional view, and (i) is (i). It is an enlarged view of the main part of g). 4A is a view of the holding body, (a) is a perspective view seen from the front side, (b) is a plan view, (c) is a perspective view seen from the rear side, and (d) is a left side view. (E) is a front view, (f) is a right side view, (g) is a sectional view taken along line FF of (e), (h) is an enlarged partial perspective view seen from the front side, and (i) is a vertical sectional view. In the figure, (j) is an enlarged view of a main part of (g).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a drawing showing an example of an embodiment of the writing tool of the present invention, FIG. 2 is a drawing showing an example of a pen tip used for the writing tool of the present invention, and FIG. 3 is a drawing of each holding body of FIG. be.
As shown in FIGS. 1A and 1B, the writing instrument A of the present embodiment has a bottomed tubular writing instrument main body 10 and is supplied from an ink occlusion body 15 housed in the writing instrument main body 10. It is provided with a pen tip 20 having a visual recognition portion capable of guiding the ink to be printed and visually recognizing the writing direction.

The writing instrument main body 10 is made of, for example, a thermoplastic resin, a thermosetting resin, or the like, and a toe shaft 16 for fixing the rear side of the pen tip 20 by fitting is attached to the front side.
The writing tool main body 10 is formed into a bottomed cylindrical shape using, for example, a resin made of polypropylene or the like, and functions as a writing tool main body (shaft body). The writing tool main body 10 is molded to be opaque or transparent (and translucent), but any of them may be adopted from the viewpoint of appearance and practical use.

The ink storage body 15 is impregnated with ink for writing tools such as water-based ink and oil-based ink. For example, natural fiber, animal hair fiber, polyacetal resin, acrylic resin, polyester resin, polyamide resin, polyurethane resin, etc. Fiber bundles made of one or more combinations of resins, polyolefin resins, polyvinyl resins, polycarbonate resins, polyether resins, polyphenylene resins, etc., processed fiber bundles such as felt, and sponges. , Resin particles, porous body such as sintered body. The ink storage body 15 is housed in the writing tool main body 10, and is housed and held in the writing tool main body 10 by the holding piece 17 on the rear side. Further, a cap having a clip portion 60a for protecting the pen tip 20 is detachably attached to the outer periphery of the tip shaft 16.

The composition of the ink for writing instruments to be used is not particularly limited, and suitable compounding formulations such as water-based inks, oil-based inks, and heat-discolorable inks can be used depending on the intended use of the writing instruments. For example, an underline pen or the like can be used. The ink can contain fluorescent dyes such as Basic Violet 11, Basic Yellow 40, and thermochromic microcapsule pigments.
These inks have an ink viscosity (25 ° C: complate type viscous meter) of 1 to 5 mPa · s, a surface tension of 30 to 60 mN / m, and a pen tip of 20 by adjusting the ink compounding component type and each compounding amount. By setting the amount of ink outflow to 5 to 20 mg / m, it is possible to achieve both the density of drawn lines and the dryness, which is preferable. The ink outflow amount is measured by setting the pen body in the automatic writing device and following JIS S6037 at a writing angle of 65 °, a writing force of 1N, and a speed of 7 cm / s on a high-quality paper surface.
When the ink for writing instruments is a thermochromic ink, a thermoplastic elastomer having a pencil drawing line erasing ability (erasing rate) of 70% or less specified in JIS S 6050-2002 is not shown, but is formed on the top of the cap. However, it is possible to obtain a friction body that easily generates frictional heat by the scraping operation and has low wear.

As shown in FIGS. 2A to 2I, the pen tip 20 has at least a holding body 30 and a writing portion 50 composed of a porous body attached to the holding body 30. An ink guiding portion 40 having a slit shape is formed in the 30.
The holding body 30 includes a bulging main body portion 31, a flange portion 32 on the front side of the main body portion 31, and a square-shaped viewing portion (window portion) 33 mainly for visually recognizing the writing direction. The front holding portions 34a and 34b that hold the tip sides (both sides) of the writing portion 50 on the tip end side of the viewing portion (window portion) 33 and one end surface of the writing portion 50 are prevented from coming off and locked. It has a locking portion 34c and a locking portion 34c.
Further, on the rear side of the main body portion 31, a rear body portion 35 and a substantially triangular insertion portion 36 inserted into the tip end side of the ink storage body 15 housed in the writing tool main body 10 are configured.
Further, a concave fitting portion 31a is formed on the outer peripheral surface in the width direction of the main body portion 31, and a bent air flow groove 31b and a straight line, which are air flow grooves, are formed on both sides of the outer peripheral surface in the longitudinal direction. The shape of the air flow groove 31c is formed.

The ink guiding unit 40 guides the ink supplied from the ink occlusion body 15 housed in the writing instrument main body 10 and supplies it to the writing unit 50, and FIGS. As shown in a) to (h), two ink portions are formed along both sides of the inside of the holding body 30 on the outer peripheral surface side, and the air replacement portion 41 and the ink portion 42 formed of a slit for guiding ink are formed. It is configured.
In the present embodiment, each of the ink guiding portions 40 has an air replacement portion 41 having an air communication groove having a rectangular cross section in the center, and ink is applied to the upper side and the lower side of the air replacement portion 41 at predetermined intervals, respectively. It has first slits 42a, 42a ... and second slits 42b, 42b ... to be guided, and the first slits 42a, 42a ... And the second slits 42b, 42b ... Are air replacement portions 41. It is not linear through the air, but is arranged in a staggered manner.
Further, the ink portion 42 including the air replacement portion 41 of the ink guiding portion 40, the first slit 42a ..., and the second slit 42b ... Is the ink guiding portion 40 on the front end surface side in contact with the writing portion 50. As shown in FIGS. 3 (a), 3 (e) and 3 (h), the opening side is a supply port (surface) 43 for supplying ink to the writing portion 50 which is exposed and is composed of a porous body. As shown in FIGS. 3 (b), (c) and (g), the outer peripheral surface of the insertion portion 36 on the rear end surface side in contact with the ink storage body 15 is also exposed to introduce the ink of the ink storage body 15. The surface is 44, and the components other than the supply port (face) 43 and the absorption port (face) 44 are not exposed to the outer surface and are formed in the holding body 30.

Each width w of each of the first slits 42a ... And the second slits 42b ... for guiding the ink in the ink guiding portion 40 guides the ink supplied from the ink occlusion body 15 housed in the writing instrument main body 10, and is suitable. Any ink can be efficiently supplied to the writing unit 50, preferably 10 to 100 μm, more preferably 20 to 70 μm, and 50 μm in the present embodiment. The total area of the first slit 42a ..., the second slit 42b ... is 0.5 to 5 mm ² in cross-sectional area, more preferably 1 to 3 mm ² , and 2 mm ² in the present embodiment. There is.
Further, the width x of the air replacement portion 41 is preferably 50 to 500 μm, more preferably 100 to 300 μm, and is 200 μm in the present embodiment. The total area of the air replacement portion 41 is 0.05 to 1.0 mm ² in cross-sectional area, more preferably 0.15 to 0.50 mm ² , and 0.32 mm ² in the present embodiment. ..
Has been done.

In the pen tip 20, the holding body 30 including the ink guiding portion 40 is, for example, at least molded from a transparent member, for example, glass, a transparent resin material, preferably a transparent resin material having no rubber elasticity. It is composed of such things. For example, the visible light transmittance of PP, PE, PET, PEN, nylon (including amorphous nylon in addition to general nylon such as 6 nylon and 12 nylon), acrylic, polymethylpentene, polystyrene, ABS, etc. It can be molded with a 3D printer or the like using 50% or more of the material.
Various methods such as material extrusion (Fused Deposition Modeling, FDM), liquid tank photopolymerization (optical modeling, SLA), material injection (inkjet type, MJP), and binder injection (inkjet) can be used as 3D printers. Formula, CJP), powder bed melt bonding (SLS), sheet lamination (LOM), directional energy deposition (LMD), etc., and in this embodiment, a galvano scanner (laser) type 3D printer is used. The holding body 30 shown in FIGS. 3 (a) to 3 (h), in which the air replacement portion 41, the ink portion 42 having the slits 42a ..., 42b ..., And the like are formed, can be manufactured. The visible light transmittance can be obtained by measuring the reflectance with a multi-light source spectrocolorimeter [manufactured by Suga Test Instruments Co., Ltd. (MSC-5N)].

As shown in FIGS. 1 and 2, the writing portion 50 has an acute-angled tip side, and is in charge of retaining the front holding portions 34a and 34b on the front side of the holding body 30 and one end surface of the writing portion 50. It is configured to be attached by a locking portion 34c that stops. Further, if necessary, an adhesive may be used to ensure the attachment.
The writing unit 50 is made of a porous body, and is, for example, a natural fiber, an animal hair fiber, a polyacetal resin, a polyethylene resin, an acrylic resin, a polyester resin, a polyamide resin, a polyurethane resin, or a polyolefin. Processing of parallel fiber bundles consisting of one or more combinations of one or more kinds of resin, polyvinyl resin, polycarbonate resin, polyether resin, polyphenylene resin, etc., fiber bundle such as felt, or resin processing of these fiber bundles. Fiber core, or porous body (sintered core) obtained by sintering plastic powder such as thermoplastic resin such as polyolefin resin, acrylic resin, polyester resin, polyamide resin, polyurethane resin, etc. Is.
Preferred writing portions 50 are fiber bundle cores, fiber cores, sintered cores, felt cores, sponge cores, and inorganic porous cores, and particularly preferably, from the viewpoint of deformability and productivity, the sintered cores. Is desirable. Further, the porosity, size, hardness, etc. of the writing unit 50 composed of the porous body to be used vary depending on the type of ink, the type of writing instrument, etc., and the porosity should be, for example, 30 to 60%. Is preferable. The porosity is calculated as follows. First, a writing core having a known mass and apparent volume is immersed in water, sufficiently immersed in water, and then the mass is measured in a state of being taken out of the water. From the measured mass, the volume of water soaked in the writing core is derived. The porosity is calculated from the following formula, assuming that the volume of this water is the same as the volume of the pores of the writing core.
Porosity (unit:%) = (volume of water) / (apparent volume of pen tip 50) x 100

In the writing tool A configured in this way, the ink storage body 15 that stores the ink for the writing tool is inserted and held in the writing tool main body 10 of the writing tool, and the tip side has the writing unit 40 having the above configuration via the toe shaft 16. The writing tool A can be easily manufactured by sequentially fixing the pen tip 20 composed of the fixed holding body 30 by fitting or the like, and the ink stored in the ink storage body 15 is the first slit 42a ... It is efficiently supplied to the writing portion 40 of the pen tip 20 by the capillary force of the ink portion 42 composed of the second slit 42b, and is used for writing.

The functions of the pen tip 20 in the writing tool A will be described below.
As shown in FIGS. 1 and 2, the pen tip 20 of the writing tool A has a visual recognition portion (window portion) 33 capable of visually recognizing the writing direction, and the ink of the ink storage body 15 has a capillary force. It flows into the ink guiding portion 40 in the holding body 30 of the pen tip 20 from the introduction port (face) 44 of the ink portion 42 having the ink portion 42, passes through the first slit 42a ..., the second slit 42b, and the supply port (face) 43. Is absorbed by the writing unit 40 attached to the tip end side of the holding body 30, and is used for writing. When writing, if you look at the visual side with the visual recognition part (window part) 33, it will be easier to align the position of the start of pulling, and you can stop it at the part you want to stop at the end of pulling, preventing excessive pulling and protrusion. It will be something that can be done.
In the present invention, as shown in FIG. 2 (h) and the like, the pen tip 20 is the above-mentioned suitable slit width (gap) which is an ink guide path 40 arranged on the outer peripheral surface side in the holding body 30 of the pen tip 20. Since the ink portion 42 including the slits 42a ..., 42b ... On the other hand, it has visibility (transparency), the thickness of the ink guiding part can be reduced, and the ink outflow property is better than the conventional sintered core in which the ink guiding part and the writing part are integrally configured. Since it is not necessary to design the ink guiding portion to be thick, the viewing portion 33 is not obstructed by the ink guiding portion. Therefore, when writing from left to right with a right-handed person, the writing section is visually recognized by the viewing section 33. It is possible to draw a line with 50, and the effective area of the visual recognition part with respect to the entire pen tip is maximized. Ink is efficiently supplied to the writing part 50 by the ink guiding part 40 having the above characteristics, so that the ink flows out. The properties are also good, and it is possible to obtain a writing tool that can achieve both maximization of the effective area of the visible portion and ink outflow.
Further, since this writing instrument A has good ink outflow, even if the pen tip 20 is moved at a high speed for writing, the ink supply follows well and the writing instrument does not cause blurring of handwriting. Will be obtained.
Further, since the air replacement portion 41 is formed in the ink guiding portion 40 in the pen tip 20, when air enters the pen tip 20, the ink does not come out from the writing portion 40, and the ink is blurred. When the ink runs out, the air replacement portion 41 allows the air to escape toward the main body portion 31 of the pen tip 20, so that the above-mentioned problems such as blurring can be solved.

Since the writing tool of the present invention is characterized by having the pen tip 20 having the above configuration, the configuration other than the pen tip 20 is not particularly limited.
4 and 5 are drawings showing other examples of the embodiment of the pen tip 20 used in the writing tool of the present invention. If the writing tool A has the same configuration and function as that of the writing tool A of the above embodiment, the same reference numerals are given and the description thereof will be omitted.
The writing tool of the present embodiment is different from the writing tool A of the above embodiment in that the forming means, the arrangement location, etc. of the ink portion 42 formed by the slit in the holding body 30 constituting the pen tip 20 having the above configuration are different. be.

In the writing tool of the above embodiment, the pen tip 20 is formed by using a 3D printer as a method of forming the holding body 30, but the present embodiment is as shown in FIGS. 5 (a) to 5 (j). The slits 42c ... formed at predetermined intervals are formed so as to be exposed on the outer peripheral surface side.
The slits 42c ... Can be formed at each predetermined position so as to be exposed by laser processing (laser engraving or the like). In the present embodiment, since the slit 42c ... Is formed by engraving from the outside, the shape is engraved from the side surface.
Examples of the laser include a carbon dioxide laser having a continuous or pulse oscillation type, a YAG laser, and an excimer laser, and among them, a carbon dioxide laser can be preferably used.
Each width w and cross-sectional area of the slits 42c ... Are set to preferable ranges as in the above embodiment. In this embodiment, since the slit 42c ... communicates with the atmosphere side, the air replacement portion can be omitted.

As shown in FIGS. 1, 4 and 5, the pen tip 20 of this writing tool also has a visual recognition portion (window portion) 33 capable of visually recognizing the writing direction, and the ink of the ink reservoir 15 is a capillary tube. It flows into the ink guiding portion 40 in the holding body 30 of the pen tip 20 from the introduction port (face) 44 of the ink portion 42 having power, passes through the slit 42c ..., reaches the supply port (face) 43, and reaches the holding body. It is absorbed by the writing unit 40 attached to the tip side of the 30 and is used for writing. When writing, if you look at the visual side with the visual recognition part (window part) 33, it will be easier to align the position of the start of pulling, and you can stop it at the part you want to stop at the end of pulling, preventing excessive pulling and protrusion. It will be something that can be done.
In the present embodiment, as shown in FIGS. 5A and 5B, the pen tip 20 has the above-mentioned suitable slit width (gap) formed on the outer peripheral surface side of the holding body 30 of the pen tip 20. Since the ink portion 42 composed of the slits 42c ... Is formed, the visible portion (window portion) 33 as a whole can be visually recognized. (Transparency) will be provided. The writing tool having the pen tip 20 having this configuration can reduce the thickness of the ink guiding portion, and has better ink outflow property than the conventional sintered core in which the ink guiding portion and the writing portion are integrally configured. Since it is not necessary to design the ink guide portion to be thick, the visibility portion 33 is not obstructed by the ink guide portion composed of a sheet-like porous body. Therefore, when writing from left to right with a right-handed person, the visibility portion 33 It is possible to draw lines with the writing section 50 while visually recognizing the writing direction, and while maximizing the effective area of the viewing section with respect to the entire pen tip, the ink guiding section 335 having the above characteristics efficiently transfers ink to the writing section 50. Since the ink is supplied, the ink outflow property is also good, and a writing tool capable of maximizing the effective area of the visible portion and the ink outflow property can be obtained.
Further, since the writing instrument having the pen tip 20 has good ink outflow property, even if the pen tip 20 is moved at a high speed for writing, the ink supply follows well and the writing marks are blurred. You will get a writing instrument that you never have.

The writing instrument of the present invention is not limited to the above-described embodiment and can be variously modified without changing the technical idea of the present invention.
In the above embodiment, the single type writing tool is shown, but a pen tip composed of a general-purpose rod-shaped porous body is appropriately attached to a portion opposite to the pen tip 20 via a holding tool, and the pen tip 20 and the pen tip 20 are attached. It can also be used as a twinl-type writing tool equipped with a stick-shaped nib. Further, the writing tool of the above embodiment may be used as a writing tool in which the pen tip 20 appears and disappears by a knock type.
Further, in the above embodiment, the first slit 42a ..., the second slit 42b ... Are formed to form the ink guiding portion 40, but if the ink can be sufficiently supplied to the writing portion 50, the second slit 42b ... It may be omitted.
Further, in the present invention, as described above, using the latest 3D printer, slits and the like can be formed at a pitch of several tens of μm, and a capillary force equivalent to that of a pen core can be applied. Since the ink guide part can be molded at once and integrally molded, the degree of design freedom is increased, and it is possible to develop a new pen tip with better design as well as expansion of the visible part (window part). If a material such as an elastomer is used by a 3D printer capable of two-color molding, not only the holding body 30 and the ink guiding portion 40 but also the writing portion 50 of the porous body can be molded at one time, and the design is comprehensively and efficiently. It will be possible. Further, the ink guiding portion 40 is cut to form a slit 42c ... by the above laser processing (laser engraving), but the latest laser engraving machine and the like have further improved engraving accuracy and form a better capillary force. By directly engraving the ink guiding portion 40 directly on the holding body 30, the design and the ink outflow property can be further improved.

In the writing tool A of the above embodiment, the cross section of the shaft body of the writing tool body is formed on a circular axis or the like, but it may be a triangular shape, a deformed shape such as a rectangular shape or more, or an elliptical shape. Further, although the case where the entire pen tip 20 is composed of a transparent member is shown, at least the visual recognition portion 33 is composed of a transparent member, and the main body portion 31 side to be attached in the writing tool main body is made of a resin member other than the transparent member. The pen tip 20 may be formed by laser processing using a two-color molded product.
Further, in each of the above embodiments, the inks for writing tools (water-based inks, oil-based inks, heat-discoloring inks) have been described, but liquids such as liquid cosmetics, liquid chemicals, coating liquids, and correction fluids may be used. be.

Next, the present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples.

[Example 1]
A writing tool having a pen tip conforming to the following configuration and FIGS. 1 to 3 and a writing tool ink having the following composition were used. For the dimensions of the pen tip, the sizes shown below were used.

(Structure of pen tip 20)
Made of acrylic resin, visible light transmittance 85% [Reflectance was measured with a multi-light source spectrophotometer (MSC-5N) manufactured by Suga Test Instruments Co., Ltd., and used as the visible light transmittance. ]
Visualization part (window part) 33 (square) size: 6 mm x 6 mm x 7 mm x 6 mm, area 0.4 cm ²
Width x of air replacement part 41: 200 μm, cross-sectional area: 0.32 mm ²
Width w of slits 42a ..., 42b ...: 50 μm, total cross-sectional area: 2 mm ²
Writing part 50: Polyethylene sintered core, Porosity: 50%, Size: 4 x 3 x 6 mm

Ink occlusion body: PET fiber bundle, porosity 85%, φ6 x 77 mm
Writing tool body 10: Made of polypropylene (PP)

(Ink composition for writing tools: Ink color: Fluorescent yellow)
As the ink for writing tools, inks having the following composition (total 100% by mass) were used.
Moisturizer: Trimethylglycine (glycine betaine) 7.5% by mass
Pentaerythritol 4.5% by mass
Colorant: NKW-4805 Yellow (manufactured by Nippon Fluorescent Co., Ltd.) 40.0% by mass
Preservative: Bio Ace (manufactured by Keiai Kasei Co., Ltd.) 0.3% by mass
pH regulator: triethanolamine 1.0% by mass
Fluorosurfactant: Surflon 8111N (manufactured by AGC Seimi Chemical Co., Ltd.) 0.2% by mass
Water-soluble organic solvent: Ethylene glycol 3.0% by mass
Water (solvent): Ion-exchanged water 43.5% by mass
Viscosity (25 ° C): 3.0 mPa · s (Complate type viscometer, manufactured by TOKIMEC, TV-20)
Surface tension (25 ° C): 33 mN / m (automatic surface tension meter, manufactured by Kyowa Interface Science, DY-300)

In the writing tool A using the pen tip 20 of Example 1 according to FIGS. 1 to 3, the pen tip including the ink guiding portion 40 can be molded by a 3D printer, and the thickness thereof can be reduced, so that the conventional patent document 1 The ink outflow property is better than that of the sintered core described in the above, which is integrally composed of the ink guiding portion and the writing portion, and it is not necessary to design the ink guiding portion to be thick. Since it is not hindered, when writing from left to right with a right-handed person, it is possible to draw a line with the writing unit 50 while visually recognizing the writing direction with the viewing unit 33, and the effective area of the viewing unit with respect to the entire pen tip. Ink is efficiently supplied to the writing unit 50 by the ink guiding unit 40, so that the ink outflow property is also good, and the writing tool can highly achieve both the maximization of the effective area of the visual recognition area and the ink outflow property. Was confirmed to be obtained.
Further, since this writing instrument A has good ink outflow, even if the pen tip 20 is moved at a high speed for writing, the ink supply follows well and the writing instrument does not cause blurring of handwriting. Was also confirmed to be obtained. In addition, it was confirmed that writing can be performed without blurring even after dropping from a height of 1 m.

Furthermore, this writing tool is set in an automatic writing device, and according to a test method compliant with JIS S6037, a writing angle of 65 °, a writing load of 1 N, and a speed of 7 cm / s are used for straight writing, and then the drawn state is visually observed. As a result of using the above-mentioned preferable ink composition, the ink flow rate (15 mg / m) of the pen tip 20 is also good, and while suppressing the drying of the pen tip, the dryness of the drawn lines and the ink It was found that it has excellent low-temperature stability and exhibits a function without blurring or strike-through in the drawn lines.

[Example 2]
A writing tool having a pen tip conforming to the following configuration and FIGS. 4 and 5 and an ink for writing tools having the following composition were used. As the dimensions and the like of the pen tip 20, the sizes and the like shown below were used. The other parts and ink compositions used were those of Example 1 above.
(Structure of pen tip 20)
Made of acrylic resin, visible light transmittance 85% [Reflectance was measured with a multi-light source spectrophotometer (MSC-5N) manufactured by Suga Test Instruments Co., Ltd., and used as the visible light transmittance. ]
Visualization part (window part) 33 (square) size: 6 mm x 6 mm x 7 mm x 6 mm, area 0.4 cm ²
Width w of slit 42c ...: 50 μm, total cross-sectional area: 2 mm ²
Molding of the holding body 30 (including the ink guiding portion 40: FIG. 5) Slit 42c ... The holding body 30 before formation was obtained by injection molding. Next, a slit 42c ... Was formed in the holding body 30 using a laser engraving machine.

In the writing instrument using the pen tip 20 of Example 2 according to FIGS. 4 to 5, the ink outflow property is also good as in the above Example 1, and the effective area of the visual recognition portion is maximized and the ink outflow property is achieved. It was confirmed that a writing instrument that is highly compatible with the above can be obtained. It was also confirmed that even if the pen tip 20 was moved at a high speed for writing, the ink supply followed well and a writing instrument that did not cause blurring of the handwriting could be obtained. In addition, it was confirmed that writing can be performed without blurring even after dropping from a height of 1 m. Further, in the same manner as above, when this writing instrument was set in the automatic writing device and tested, the ink flow rate (15 mg / m) of the pen tip 20 was also good, and the drawing line was dried while suppressing the drying of the pen tip. It was found that it has excellent properties and low-temperature stability of the ink, and exhibits a function without bleeding or strike-through in the drawn lines.

The pen tip of the present invention can be suitably applied as a pen tip used for a type of writing instrument called an underline pen, a paint marker, an oil-based marker, and a water-based marker.

10 Writing instrument body 20 Pen tip 30 Holding body 40 Ink guiding part 41 Air replacement part 42 Ink part 50 Writing part

Claims (2)

A writing tool having a pen tip having a visual recognition portion capable of guiding ink supplied from the writing tool main body and visually recognizing the writing direction, and the pen tip is at least a writing portion and a holding body having a visual recognition portion. In the holder, an ink guiding portion is formed inside the holding body, and the ink guiding portion has a slit for guiding ink having a width of 10 to 100 μm and a rectangular cross section having a width of 50 to 500 μm in contact with the slit. A writing instrument characterized in that it is composed of an air replacement portion that serves as an air communication groove. A writing tool having a pen tip having a visual recognition portion capable of guiding ink supplied from the writing tool main body and visually recognizing the writing direction, and the pen tip is at least a writing portion and a holding body having a visual recognition portion. The writing instrument is characterized in that an ink guiding portion having a plurality of slit shapes is formed on the rear end surface side in contact with the ink storage body and communicates with the outside of the holding body.

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