JP6946391B2 - Writing implements - Google Patents

Description

The present invention relates to a type of writing tool called an underline marker or the like that supplies ink in the writing tool body to the writing part of the pen tip. Regarding writing tools that can reliably write until the end of writing.

Conventionally, as a writing instrument capable of visually recognizing the writing direction with a visual portion of a pen tip, a writing instrument having each structure (see, for example, Patent Documents 1 to 5 by the applicant) has been known. In each of these patent documents, as demonstrating the proximity technique of the present invention, for example, as shown in FIG. 9, a writing tool 1 having a pen body 1b that can guide and hold ink supplied from the writing tool main body 1a. In the pen body 1b, the pen body 1b includes an ink guiding unit 1c and a writing unit 1d that derives ink from the ink guiding unit 1c, and a visible unit 1e that can visually recognize the writing direction directly above the writing unit 1d in the axial direction. A writing tool (see, for example, Patent Document 1 by the Applicant) is known, and in particular, each pen body shown in FIGS. 10 and 11 discloses a proximity technique closest to the present invention. Is what you do.

10 (a) and 10 (b) are drawings of the sixth embodiment of the pen body in the writing tool described in Patent Document 1. The pen body 2 of this embodiment is provided with a writing portion 2c fixed by a leg portion 2b at the front end of the transparent support member 2a, and communicates with the rear end of the leg portion 2b of the writing portion 2c to be inside the support member 2a. The structure is such that an ink guiding portion 2d formed of an ink guiding groove that can guide ink by a capillary action is provided at a required portion, and since the support member 2a is made of a transparent resin or the like, 2e is a visible portion. Therefore, the writing direction is visually recognized through the circulating ink in the visible portion 2a.
11 (a) and 11 (b) are the eighth embodiment of the pen body of the pen body in the writing instrument described in Patent Document 1. The pen body 3 of this embodiment has substantially the same configuration as the pen body of the sixth embodiment of FIG. 10, and the difference is that the window portion 3b as a visible portion is bored in the support member 3a and the ink is formed. The guide groove 3c is formed so as to bypass the window portion 3b, and has a structure in which ink can be supplied to the writing portion 3d by a capillary action.

However, in the writing instrument described in Patent Document 1, in FIGS. 9 and 11, the ink guiding portions 1c and 3c are provided on both sides of the visible portions 1e and 3b, and the writing portions 1d and 3d are provided at the lower portion. Therefore, the area ratio of the visible portion 1e having visibility is actually in the 30% range of the pen tip (pen body) protruding from the tip of the writing instrument main body, so that sufficient visibility can be ensured. However, there is a problem in that the writing direction is a little difficult to see. If this visible portion is enlarged, the visibility in the writing direction is widened, but since the writing portion is also enlarged, the writing performance as a line marker is impaired.
Further, in the pen body 2 shown in FIG. 10, since the writing direction is visually recognized through the circulating ink in the visible portion 2a, there is a problem that the writing direction is difficult to see when the ink color is dark. Further, since the leg portion 2b fixed in the visible portion 2a does not have visibility, the area ratio of the visible portion 2a having visibility is practically a pen tip (pen body) protruding from the tip of the writing instrument main body. Since it is in the 30% range, it is not possible to secure sufficient visibility, and the current situation is that a pen body having a structure that allows wide visibility in the writing direction is desired.

On the other hand, as an ink end detection type writing tool capable of visually recognizing a portion in the writing direction behind the writing portion and detecting an ink end sign, for example, FIGS. 12 (a) and 12 (b) show. As shown, the ink impregnated in the ink storage body 4b in the barrel 4a is supplied to the pen tip 4e which is the writing part via the relay core 4c and the ink guide part 4d, and the ink storage body 4b An ink end detection type writing tool that detects the end sign of ink by visually recognizing it with the ink guide unit 4d. The ink guide unit 4d has a visible portion 4f that can visually recognize the writing direction and a side of the visible portion 4f. The writing tool 4 having an ink guide tube 4 g in the portion (see, for example, Patent Document 6 by the applicant) and the ink reservoir 5b in the barrel 5a are impregnated as shown in FIGS. 13 (a) and 13 (b). The ink is supplied to the pen tip 5e, which is the writing unit, via the relay core 5c and the ink guide tube 5d, and the ink end sign of the ink reservoir 5b is visually recognized by the ink guide tube 5d. An ink end detection type writing tool for detecting, the ink guide tube 5d has a flat plate-shaped ink guide portion 5 g provided with a slit-shaped ink flow path 5e having a thickness of 0.01 to 1.0 mm inside. A writing tool 5 that has a visible light transmittance of 50% or more of the ink guiding portion 5g at the time of ink filling, and can visually recognize the writing direction directly below the axial direction of the ink guiding portion 5g through the ink guiding portion 5g. (See, for example, Patent Document 7 by the applicant) is known.

However, in the writing tool 4 shown in FIGS. 12A and 12B, the ink guide tube 4g becomes thicker (larger) in order to reliably detect the end sign, so that sufficient visibility must be ensured. There are some problems in that it cannot be done. Further, since the shape of the ink guide tube 4g is complicated, it is difficult and not easy to secure the sealing property of the pen tip and to have a structure in which the ink is used up to the end.
Further, in the writing tool 5 shown in FIGS. 13 (a) and 13 (b), if the ink guiding portion is thinned to such an extent that sufficient visibility can be ensured, the ink flow rate cannot be secured and sufficient. When trying to secure the ink flow rate, it was not possible to secure sufficient visibility, and therefore, there were few effective visible parts and it was difficult to see.

Japanese Unexamined Patent Publication No. 2000-52682 (Claims, Embodiments, FIGS. 1, 11, 12, etc.) Japanese Unexamined Patent Publication No. 2001-253193 (Claims, Embodiments, FIG. 1, etc.) Japanese Unexamined Patent Publication No. 2002-19370 (Claims, Embodiments, FIG. 1, etc.) JP-A-2005-246606 (Claims, Embodiments, FIG. 1, etc.) Japanese Unexamined Patent Publication No. 2006-256045 (Claims, Embodiments, FIG. 1, etc.) Japanese Unexamined Patent Publication No. 2007-69426 (Claims, Embodiments, FIG. 1, etc.) JP-A-2007-69427 (Claims, Embodiments, 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. Sufficient visual recognition capable of reliably reading characters written in the writing direction with a writing instrument having a visual recognition portion and an ink guiding portion. The purpose is to provide a writing instrument that can be used until the end of writing by imparting sexuality, and a sufficient writing flow can be secured until the end of writing without impairing visibility, making it easy to write and having excellent durability. The purpose is to provide.

As a result of diligent studies in order to solve the above-mentioned conventional problems, the present inventors have made a pen tip to hold a porous body to be a writing portion and a porous body to supply ink to the writing portion. A visual unit provided with a holding body having an ink guiding portion, the ink contained in the writing tool main body is supplied to the writing portion through the ink guiding portion of the holding body, and the holding body can visually recognize the writing direction. By setting the area ratio of the visible portion to a pen tip structure of a specific value or more, the structure of the ink guiding portion and the interface structure between the porous body and the holding body serving as the writing portion are specified. It was found that the writing tool of the above object could be obtained by adopting the structure, and the present invention was completed.

That is, the present invention exists in the following (1) to (3).
(1) The pen tip includes a porous body serving as 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 is included in the writing tool main body. An ink is supplied to the writing unit through the ink guiding portion of the holding body, and the holding body is a writing tool that serves as a visual viewing unit capable of visually recognizing the writing direction, and is an outer periphery of the ink guiding portion of the holding body. The flange is integrally formed of the same material as the holding body, the ink guiding portion is formed in the longitudinal direction of the holding body, and the area ratio of the visible portion is the pen tip protruding from the tip end portion of the writing tool main body. A writing tool having a content of 40% or more, in which ink is directly supplied to the ink guiding portion, and the total cross-sectional area of the ink guiding portion inside the holder is 0.01 to 7 mm ^2. (2) The writing tool according to (1) above, wherein the writing portion is inclined with respect to the major axis direction of the main body axis.
(3) The resin forming the retainer from the retainer enters the unevenness of the pores of the porous body in the portion where the porous body serving as the writing portion and the retainer are in contact with each other to form the retainer resin layer, thereby forming the porous body. The writing tool according to (1) or (2) above, wherein the body and the holding body are fixed.

According to the present invention, sufficient visibility is provided so that characters written in the writing direction can be read more reliably than before, and ink is supplied to the ink guiding portion without impairing the visibility. Since it is efficiently supplied to the writing part, it is possible to use a sufficient writing flow until the end of writing, and a writing instrument that can firmly fix the porous body to be the writing part and the holding body having the ink guiding part is provided. Will be done.
According to the invention of claim 2, a sufficient writing flow rate can be secured until the end of writing without impairing the visibility, and it is easy to write, and the porous body serving as the writing portion and the holding body having the ink guiding portion are fixed. A writing instrument that can be strengthened is provided.

It is a vertical sectional view of the writing instrument which shows an example of the Embodiment of this invention. (A) is a vertical sectional view showing an example of a pen tip used for the writing tool of the present invention, (b) is a sectional view taken along line AA of (a), and (c) is a sectional view taken along line BB of (a). be. (A) is a front view showing a state in which a relay porous body, a porous body serving as a writing portion, a holding body having an ink guiding portion, and the like are set, and (b) is a vertical sectional view of (a), (c), and (D) is a plan view and a perspective view of the holding body. (A) is a plan view of a state in which a porous body serving as a writing portion and a holding body having an ink guiding portion are set, (b) is a side view thereof, and (c) and (d) are the porous body and the holding body. It is a front view and a side view which shows the holder resin layer of the boundary surface of. (A) is an enlarged vertical sectional view showing a state in which a holding body having an ink guiding portion and a relay porous body are set, and (b) is a vertical sectional view showing another example of (a). (A) to (d) are front views showing the shape of the ink guiding portion of the pen tip other than the linear shape in the major axis direction. (A) and (b) are continuation of FIG. 6 and are front views showing the shape of the ink guiding portion of the pen tip other than the linear shape in the major axis direction. It is a front view which shows each dimension of the pen tip used for the writing tool of the Example and the comparative example of this invention. It is a vertical sectional view of the writing instrument which shows an example of the conventional writing instrument. (A) and (b) are a front view and a cross-sectional view showing an example of a pen tip in the conventional writing tool of FIG. 7. (A) and (b) are a front view and a cross-sectional view showing another example of the pen tip in the conventional writing tool of FIG. 7. (A) and (b) are a vertical sectional view of a writing instrument showing an example of a conventional writing instrument, and a cross-sectional view showing an example of a pen tip in the writing instrument. (A) and (b) are a vertical sectional view of a writing instrument showing an example of a conventional writing instrument, and a cross-sectional view showing an example of a pen tip in the writing instrument.

Hereinafter, embodiments of the present invention will be described in detail.
1 is a vertical cross-sectional view showing an example of an embodiment of the writing instrument of the present invention, FIG. 2 is a drawing showing a pen tip, (a) is a vertical cross-sectional view, and (b) is line AA of (a). A cross-sectional view, (c) is a cross-sectional view taken along the line BB of (a).
The writing instrument A of the present embodiment is a marking pen type writing instrument, and as shown in FIG. 1, a shaft cylinder 10 which is a writing instrument main body, an ink occlusion body 20, a relay porous body 30, a pen tip 40, and a tail plug 60 are attached. I have.
The shaft cylinder 10 is made of, for example, a thermoplastic resin, a thermosetting resin, glass, or the like, and fixes the pen tip 40 to the main body 11 that houses the ink occlusion body 20 impregnated with the ink for writing instruments. It has a toe shaft portion 12.

The ink storage body 20 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, and polyurethane resin are used. A fiber bundle composed of one or a combination of two or more kinds such as a resin, a polyolefin resin, a polyvinyl resin, a polycarbonate resin, a polyether resin, and a polyphenylene resin, a processed fiber bundle such as felt, and a sponge. , Resin particles, and porous materials such as sintered bodies. The ink storage body 20 is housed in the main body 11 of the barrel 10.
The rear end side opening of the barrel 10 is sealed with a breech plug 60 formed of the same material as the barrel 10 or a different synthetic resin material.
The ink composition used is not particularly limited, and in an underline pen or the like, the ink may contain a fluorescent dye, for example, basic violet 11, basic yellow 40, or the like.

The relay porous body 30 serves as a relay core for supplying the ink of the ink storage body 20 to the ink guiding portion 50 provided in the holding body 55, which will be described later, and like the ink storage body 20, fibers such as fiber bundles and felts. It has continuous pores (flow paths) such as a fiber bundle core obtained by processing a bundle, a resin particle porous body made of a hard sponge, a resin particle sintered body, or a sliver core, and is impregnated with the ink reservoir 20. As long as the ink can be supplied to the ink guiding portion 50 of the holding body 55 via the relay porous body 30, the shape, structure, and the like thereof are not particularly limited. Examples of the cross-sectional shape of the relay porous body include a circle, an ellipse, a square, a rectangle, a trapezoid, a parallelogram, a rhombus, a kamaboko shape, and a crescent shape. It has become. As shown in FIG. 1, the relay porous body 30 of the present embodiment has a structure of being held by a support member 35 fitted in the leading shaft 12.

As shown in FIGS. 1 and 2, the pen tip 40 includes a porous body (pen core) 45 as a writing portion and an ink guiding portion 50 for holding the porous body 45 and supplying ink to the writing portion. It is provided with a holding body 55 having a holding body 55.
The porous body 45 serving as the writing portion of the present embodiment is fixed to the tip end portion of the holding body 55, and is, for example, a natural fiber, an animal hair fiber, a polyacetal resin, a polyethylene resin, an acrylic resin, or a polyester resin. Fibers such as parallel fiber bundles and felts made of one or more combinations of resins, polyamide resins, polyurethane resins, polyolefin resins, polyvinyl resins, polycarbonate resins, polyether resins, polyphenylene resins, etc. It is composed of a fiber core obtained by processing a bundle or processing a resin of these fiber bundles, or a porous body (sintered core) obtained by sintering various plastic powders or the like.

Examples of the shape of the porous body 45 serving as the writing portion include a chisel shape, a bullet shape, a cylinder, an elliptical column, a cube, a rectangular parallelepiped, and the like, and the cross-sectional shape thereof is a trapezoid or a parallelogram. , A diamond shape, a cuboid shape, a crescent shape, and the like, and in the present embodiment, it is a chisel shape. The chisel shape is a shape in which the tip forms an inclined surface with respect to the center line of the pen shaft and the inclined surface is flat.
Further, the porous body 45 to be the writing portion is preferably tilted at an angle of 40 to 90 ° with respect to the major axis direction of the main body axis so as to be tilted so as to be easy to write. Then, the inclination is 75 °.
The shape, inclination, and the like of the porous body 45 serving as the writing portion are appropriately set according to the usability of writing and the like. The porous body 45 to be the writing portion has a thick drawing line width, preferably a drawing line width of 2 mm or more, and more preferably a drawing line width of 3 mm or more.

The holding body 55 of the present embodiment is made of a material having visibility, for example, PP, PE, PET, PEN, nylon (including amorphous nylon and the like in addition to general nylon such as 6 nylon and 12 nylon), and acrylic. , Polymethylpentene, polystyrene, ABS and the like, and preferably made of a material having a visible light transmittance of 50% or more.
When this material having a visible light transmittance of less than 50% is used, the characters written in the writing direction may not be effectively visible, which is not preferable. A material that transmits 50% or more is preferable, and if the visible light transmittance is 80% or more, the material can be visually recognized even better.
The visible light transmittance can be obtained by measuring the reflectance using a multi-light source colorimeter.

The holding body 55 can be configured by using one type of each of the above materials, or two or more types of materials from the viewpoint of further improving durability and visibility, and is composed of two or more types of materials. In this case, it is preferable that at least one of them is made of a material having a visible light transmittance of 50% or more, and it can be molded by various molding methods such as injection molding and blow molding.

The holding body 55 has at least one ink guiding portion 50 for supplying ink to the writing portion, and in the present embodiment, the area ratio of the viewing portion can be maximized. As shown in FIGS. 2A and 2C, one ink guiding portion 50 is provided so as to penetrate the center in the longitudinal direction from the viewpoint of efficiently supplying ink to the porous body.
The shape, size, etc. of the ink guiding portion 50 are such that the ink impregnated in the ink occlusion body 20 contained in the writing instrument body can be directly supplied to the ink guiding portion via the relay porous body 30. , The shape, structure, size, number, etc. can be appropriately selected.
Preferably, the length W of the ink guiding portion 50 in the cross-sectional width direction is less than 40% of the major axis length X of the pen tip, and more preferably 1 to 30 from the viewpoint of maximizing the effect of the present invention. It is desirable that the cross-sectional area of the ink guiding portion 50 is less than the cross-sectional area of the writing portion on the holding body side, or less than the cross-sectional area of the relay porous body 30 on the holding body side.

In particular, the length of the ink guiding portion 50 in the width direction is 3 mm or less, preferably 0.1 to 1, from the viewpoint of ensuring a sufficient writing flow rate and ensuring a sufficient writing flow rate without impairing the visibility of the holder. It is preferably 2.5 mm and has a diameter of 0.1 to 3.0 mm, preferably 0.2 to 3.0 mm in diameter.
It is preferably tubular with a diameter of 2.5 mm, more preferably 0.2 to 2.0 mm.
Further, the total cross-sectional area of the ink guiding portion 50 inside the holding body 55 ^{is preferably 0.01 to 7 mm 2} , preferably 0.03 to 5 mm 2, and more preferably 0.03 to ⁴ mm ^2. ..
Further, the ink guiding portion 50 preferably has a taper formed toward the writing portion 45 side, and a plurality of two or more ink guiding portions 50 are oriented at 0 to 30 ° with respect to the major axis direction of the main body axis. However, it is desirable that only one is provided.
The shape of the ink guiding portion 50 is preferably a straight line in the major axis direction, but as will be described later, the ink guiding portion 50 has a V-shape, an X-shape, a Y-shape, a spiral shape, an inverted V-shape, and an inverted Y-shape. In this way, the shape can be made easy to see.
In the present embodiment, from the viewpoint of protecting the writing portion porous body and ensuring the sealing property, the flange 51 is integrally formed on the relay porous body 30 side of the holding body 55 with the same material as the holding body, and the ink guiding portion 50 is formed. At the rear end, openings 52 larger than the ink guiding portion 50 are formed concentrically.

As a method for forming the ink guiding portion 50 having the above structure, for example, a resin is poured into a mold provided with a rod-shaped body for forming the ink guiding portion, and after molding by each resin molding method such as injection molding or blow molding, the ink guiding portion 50 is formed. A method of forming an ink guiding portion 50 on the holding body 55 by die cutting, a method of forming the ink guiding portion 50 by drilling, laser processing, etc. after molding the holding body 55, and using the holding body 55 as two members and ink for each. A method of forming the ink guiding portion 50 on the holding body 55 after forming the groove for forming the guiding portion and then integrating them by adhesion, welding, or the like can be mentioned, and the ink guiding portion 50 is formed by the same method described in the prior art document. can do.

In the present invention, preferably, the ink guiding portion 50 provided inside the holding body 55 has a visible light transmittance of less than 50% in a state where the ink for writing tools described later is contained, and does not function as a visible portion. It is desirable that the writing direction is not effectively visible. If the ink guiding portion 50 is in a visible state with the ink contained in the ink guiding portion 50, the use of the coloring component of the ink is restricted, and the ink color corresponding to the needs cannot be obtained, which is not preferable. In such a case, a pipe colored with substantially the same color as the writing instrument ink may be inserted into the ink guiding portion 50 so that the ink color can be easily discriminated.
Further, the portion of the holding body 55 other than the ink guiding portion 50 serves as a surface forming the viewing portion, and it is desirable that the portions are substantially parallel surfaces in order to effectively visually recognize the writing direction. It is also possible to magnify the visual recognition portion as a lens surface for visual recognition.

In the present invention, the adhesion between the porous body 45 as the writing portion and the holding body 55 having the ink guiding portion 50 is a porous body from the viewpoint of firmly fixing the porous body 45 in a state where the sealing performance is imparted. The resin forming the retainer from the retainer 55 enters the irregularities of the pores of the porous body 45 in the portion where the holder 45 and the retainer 55 are in contact with each other, and the retainer resin layer is formed to form the retainer resin layer to form the retainer 45 and the retainer. It is desirable that 55 be fixed.
The material forming the porous body 45 and the holding body 55 is preferably selected from resins having different solubility in a solvent. For example, the porous body 45 may be made of a polyethylene sintered core, and the holding body may be made of acrylic. For example, as a solvent, the difference in solubility parameter (SP value) between the porous resin and the retainer resin can be 0.5 or more, so that alcohol, ester (butyl acetate), ether, ketone (acetone), glycol ether By using an organic solvent such as an alicyclic hydrocarbon, an aliphatic hydrocarbon, a chloride aliphatic hydrocarbon (dichloromethane), an aromatic hydrocarbon, or a chloride aromatic hydrocarbon, the porous body 45 serving as the writing part can be used. The holding body 55 having the ink guiding portion 50 can be fixed.

Preferably, on the end surface of the ink guiding portion 50 on the writing portion porous body 45 side, the holding body resin layer (hereinafter, "adhesive surface of the holding body resin layer of the boundary surface" is formed on the boundary surface between the porous body 45 and the holding body 55 ". The adhesive surface has a length of 0.5 mm or more, more preferably 0, in all directions of the end surface.
.. It is desirable that it is formed in an amount of 8 to 3 mm.
This adhesive surface can be formed on any of a flat surface, a curved surface, and a bent portion, and the adhesive surface of the ink guiding portion 50 on the writing portion porous body 45 side has an adhesive surface of 0.5 mm or more over the entire circumference of the end surface. More preferably, it is preferably formed in an amount of 0.8 to 3 mm.
Further, it is desirable that the retainer resin layer on the adhesive surface is formed in an amount of 1 to 1000 μm, more preferably 10 to 800 μm toward the inside of the porous body 45, and the retainer in contact with the writing portion porous body 45. It is desirable that the surface of the local peak of the contact portion of 55 is satin finished by embossing or the like.

3 and 4 show an embodiment of an adhesive structure of a porous body 45 serving as a writing portion and a holding body 55 having an ink guiding portion 50.
3 (a) and 3 (b) are front views showing a state in which the relay porous body 30, the support member 35, the porous body 45 to be the writing portion, and the holding body 55 having the ink guiding portion 50 are set. FIG. 4C is a plan view and a perspective view of the holding body 55, and FIG. 4A is a holding body 55 having a porous body 45 as a writing portion and an ink guiding portion 50. The plan view of the state in which and is set, (b) is a side view thereof, and (c) and (d) are a front view and a side view showing the holding body resin layer 46 at the boundary surface between the porous body 45 and the holding body 55. ..

In this embodiment, as shown in FIG. 3D, a rib body is formed on the upper portion of the holding body 55 from the viewpoint of firmly fixing the porous body 45 serving as the writing portion and the holding body 55 having the ink guiding portion 50. 56 is provided on two or more of the side surfaces of the writing portion porous body 45, and two are provided in this embodiment.
Further, as shown in FIG. 3D, the adhesive surface between the porous body 45 serving as the writing portion and the holding body 55 having the ink guiding portion 50 is two surfaces inside the side surface of the rib body 56 and the ink guiding portion. The bottom surface excluding the opening of 50 is an adhesive surface, which is a flat surface, and the surface of the local peak of the contact portion of the holding body 55 in contact with the writing portion porous body 45 is textured or the like. It is in a satin state.
In this embodiment, the porous body 45 and the holding body 55 can be fixed by two-color molding or the like.

In the present embodiment configured as described above, the porous body 45 serving as the writing portion and the holding body 55 having the ink guiding portion 50 are adhered to each other, and the porous body 45 and the holding body 55 are in contact with each other. The resin forming the retainer from the retainer 55 enters the unevenness of the pores of the body 45, and the retainer resin layer 46 is formed on the bottom surface to form the porous body 45 and the ink guiding portion 50 as the writing portion. It is possible to obtain a writing tool having excellent durability, which can be reliably fixed to the holding body 55 and can secure a sufficient writing flow rate until the end of writing.

Further, in the present invention, the relay porous body 30 and the holding body 55 can be bonded by forming a holding body resin layer or the like in the same manner as in the above-described embodiment.
Specifically, as shown in FIG. 5A, the adhesive surface on the relay porous body 30 side is formed on any of a flat surface, a curved surface, and a bent portion, and the relay porous body 30 side end surface of the ink guiding portion 50 is formed. , A retainer resin layer (hereinafter referred to as "relay porous body side adhesive surface") is provided on the boundary surface between the retainer 55 and the relay porous body 30 inserted into the support member 35 of the retainer 55 on the entire circumference of the relay porous body 30. The retainer 55 having a cross-sectional thickness of 0.5 mm or more and having a circumferential retainer resin layer 31 on the adhesive surface on the relay porous body 30 side is 1 to 1000 μm toward the inside of the porous body and is in contact with the relay porous body 30. The surface of the local summit of the contact part is made satin-finished by embossing.

In the present embodiment configured as described above, the relay porous body 30 and the holding body 55 having the ink guiding portion 50 are adhered to each other by the relay porous body 30 at the portion where the relay porous body 30 and the holding body 55 are in contact with each other. The resin forming the retainer from the retainer 55 enters the unevenness of the pores of the retainer 55 to form the retainer resin layer 31, so that the relay porous body 30 and the retainer 55 having the ink guiding portion 50 can be fixed. It can be reliably performed, a sufficient writing flow rate can be supplied to the ink guiding unit 50, and the durability is excellent. Further, as shown in FIG. 5B, the retainer resin layer 31 may be formed on the entire portion where the relay porous body 30 is press-fitted and the support member 35 and the relay porous body 30 are in contact with each other. ..

In the writing tool of the present invention, as described above, the pen tip 40 has a porous body 45 as a writing portion and at least one ink guiding portion 50 for holding the porous body 45 and supplying ink to the writing portion. The holding body 55 is provided, and the holding body 55 has a relay porous body 30 for supplying the ink contained in the writing tool main body 10 to the ink guiding portion 50 provided in the holding body 55, and the holding body 55 has visibility. Since the holding body 55 is made of a material having the above, the entire surface (whole) other than the ink guiding portion 50 becomes a visible portion in which the writing direction can be visually recognized. The area ratio of the pen tip can be 40% or more of the pen tip protruding from the tip of the writing tool main body 10, preferably, the visible portion on the side surface of the holding body 55 of the pen tip is also 40% or more, and further, the ink guiding portion. By forming 50 in the central portion in the longitudinal direction of the holding body 55 and appropriately setting the length, diameter, cross-sectional area, etc. of the ink guiding portion 50 in the width direction within the above-mentioned preferable ranges, the area ratio of the visible portion is further increased. Can be increased to 50% or more, and sufficient visibility can be provided so that the characters written in the writing direction can be read more reliably than before, and a writing tool that can be used until the end of writing is provided. NS. In particular, by forming the ink guiding portion 50 in the central portion in the longitudinal direction of the holding body 55, ink can be efficiently supplied to the porous body 45 serving as the writing portion, so that the ink can be used until the end of writing. Writing utensils will be provided.
Further, by forming the ink guiding portion 50 in the central portion in the longitudinal direction of the holding body 55, it is easy to determine the writing direction and the shape is very easy to write.
Further, by providing the rib body 56 on the upper part of the holding body 55, it is possible to draw a straight line or the like without soiling the ruler when writing with a ruler.
Furthermore, by providing a mechanism in which the liquid is directly supplied to the ink guiding portion 50, the ink can be efficiently supplied to the porous body 45 which is the writing portion. When a porous body is used as the ink guiding portion 50, a suitable ink flow rate may not be obtained.

The writing tool of the present invention is not limited to the above-described embodiment and can be variously modified without changing the gist of the present invention.
For example, in the above embodiment, the shape of the ink guiding portion 50 formed linearly with respect to the long axis direction has been described in detail, but the shape of the ink guiding portion 50 of the pen tip 40 is shown in FIGS. The shapes shown in (d) and FIGS. 7 (a) and 7 (b) can be made into shapes that are easy to see. In FIGS. 6 and 7, the same configurations as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.
6 (a) shows a V-shaped shape of the ink guiding portion 50, FIG. 6 (b) shows an X-shaped shape, FIG. 6 (c) shows a Y-shaped shape, and FIG. 6 (d) shows a Y-shaped shape. The spiral shape, FIG. 7 (a) is an inverted V shape, and FIG. 7 (b) is an inverted X shape.
Further, in the above embodiment, two rib bodies 56 are provided, but three rib bodies 56 may be provided. Further, it can be provided on the entire circumference (4 directions) of the porous body.

Next, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.
[Test Example 1: Examples 1 to 4 and Comparative Examples 1 to 6]
A writing instrument and ink equipped with a pen tip having the following configuration were used. The dimensions of the porous body, the holding body, the ink guiding portion, etc., which serve as the writing portion constituting each pen tip, were the sizes shown in Tables 1 and 8 below. The writing instrument members and ink other than the pen tip were the same.

(Composition of pen tip)
Porous writing part: PE sintered core, porosity 60%
Holder: Acrylic, visible light transmittance 85% [Reflectance was measured with a multi-light source spectrocolorimeter (MSC-5N) manufactured by Suga Test Instruments Co., Ltd., and used as the visible light transmittance. same as below. ]
The area (area ratio) of the visible part of each pen tip was calculated by measuring the actual size of the molded product. The visible area (area ratio) of each pen tip is shown in Table 1 below.
Ink guide: Cylindrical shape, each diameter shown in Table 1 below, visible light transmittance 27% with ink (common)
(Structure of writing tool members other than the pen tip)
Relay porous body: PET fiber bundle, porosity 65%, φ4 x 25 mm
Ink occlusion body: PET fiber bundle, porosity 85%, φ14 × 55 mm
Writing tool body, breech plug, cap: Polypropylene (PP) relay porous body, writing part porous body, and holder were adhered as follows.
The relay porous body and the writing section porous body were adhered by temporarily inserting each porous body into the holding body, impregnating it with an organic solvent (ethyl acetate), and drying it.

As the porous body of the ink induction portion of Comparative Example 3, a PET fiber bundle, a porosity of 65%, and a diameter of 1.5 × 8 mm was used.
Comparative Example 5 is based on FIG. 1 (FIG. 12 of the present application) of Patent Document 6 (Japanese Patent Laid-Open No. 2007-69426) which is a prior art, and Comparative Example 6 is Patent Document 7 (Japanese Patent Laid-Open No. 2007) which is a prior art. It is based on FIG. 1 (FIG. 13 of the present application) of Japanese Patent Application Laid-Open No. -69427, and the material and size of the pen tip described in Example 1 of each patent document are used.

(Ink composition, common)
As the ink, fluorescent peach ink having the following composition was used.
Color material: VC toner Peach (manufactured by Mikuni Color Co., Ltd.) 30 parts by mass Wetting agent: Glycerin 25 parts by mass Preservative: Bio Ace (manufactured by Keiai Kasei Co., Ltd.) 0.7 parts by mass Ion-exchanged water 44.3 parts by mass

The visibility and ink flow rate were evaluated by the following evaluation methods using each pen tip having the above configuration.
The results of these evaluations are shown in Table 1 below.

(Visibility evaluation method)
Writing was performed on the characters, and the appearance on the other side was visually confirmed through the visual recognition part at the time of writing, and the visibility was evaluated according to the following evaluation criteria.
Visibility evaluation criteria:
◯: Sufficient visibility. It is very easy to see and you can write while reading the characters written in the writing direction.
Δ: Insufficient visibility. There is some visibility, but it is necessary to carefully read the characters written in the writing direction.
X: Insufficient visibility. It is partially visible, but not visible during normal use.

(Evaluation method of ink flow rate)
Set the pen body in the automatic writing device, write in a straight line at a writing angle of 65 °, writing force of 1N, speed of 7cm / s, and distance of 20m on high-quality paper according to JIS S6037, and then visually check the writing state. , The ink flow rate was evaluated according to the following evaluation criteria.
Ink flow rate evaluation criteria:
◯: Good writeability. There is no faint drawing line.
Δ: Insufficient writing ability. There is a faint drawing line.
×: Insufficient writing ability. There is a remarkable faint drawing line.

As is clear from the results in Table 1 above, Examples 1 to 4 which are the scope of the present invention have characters written in the writing direction more than before, as compared with Comparative Examples 1 to 6 which are outside the scope of the present invention. It has been found that the writing tool can be used until the end of writing while being able to provide sufficient visibility that can be read reliably.
In Comparative Examples 5 and 6 (Japanese Patent Laid-Open No. 2007-69426, FIG. 12, Japanese Patent Application Laid-Open No. 2007-69427, FIG. 13 of the present application), the writing direction can be visually recognized through the direct liquid portion, but in writing, etc. It was difficult to see in normal use, and it could not be said that sufficient visibility was given.

[Test Example 2: Examples 5 to 7 and Comparative Examples 7 to 8]
In Test Example 2, the adhesive strength and the sealing performance were evaluated by the following evaluation methods by changing the adhesive surface shape, the adhesive surface dimension, and the shortest adhesive surface length for adhesion to the writing portion porous body and the holding body. These results are shown in Table 2 below.
A writing tool provided with the pen tip of Example 1 and produced by the following method was used.
Adhesion to the writing portion porous body and the holding body was performed by the following method.
The relay porous body and the writing portion porous body were adhered by temporarily inserting each porous body into the holding body, impregnating it with an organic solvent, and drying it.

(Evaluation method of adhesive strength)
The adhered porous body of the writing part was peeled off by a hand wearing rubber gloves, and evaluated according to the following evaluation criteria.
Adhesive strength evaluation criteria:
◯: Sufficient adhesive strength. When an attempt is made to peel off the writing portion porous body, the writing portion porous body is broken before the adhesive portion is peeled off.
Δ: Adhesive strength at a level that can withstand normal use. Insufficient adhesive strength. If you try to peel off the writing part porous body, the writing part porous body will come off. It cannot be peeled off by writing.
X: Insufficient adhesive strength. The porous body of the writing part is peeled off from the holding body by writing or the like.

(Evaluation method of seal performance)
The seal performance was evaluated according to the following evaluation criteria, whether or not there was seal breakage during writing, and whether or not there was seal breakage when the pen tip was freely dropped onto concrete from 150 cm. When the seal breaks, air (air bubbles) enters the direct liquid part, so it can be visually confirmed.
Evaluation criteria for sealing performance:
◯: There is no problem with sealing performance.
Δ: The seal is broken due to a drop impact or the like, and minute bubbles enter the ink guiding portion.
X: The seal is broken due to a drop impact or the like, and large bubbles enter the ink guiding portion.

As is clear from the results in Table 2 above, Examples 5 to 7 which are within the scope of the present invention are superior in adhesive strength and sealing performance as compared with Comparative Examples 7 to 8 which are outside the scope of the present invention. found.

[Test Example 3: Examples 8 to 10 and Comparative Examples 9 to 10]
In Test Example 3, the adhesive strength and sealing performance depending on the thickness of the resin layer of the retainer were evaluated by the above evaluation method. These results are shown in Table 3 below.
A writing tool provided with the pen tip of Example 1 and prepared in the same manner as in Test Example 2 but with only the thickness of the holder resin layer changed was used.

As is clear from the results in Table 3 above, Examples 8 to 10 which are within the scope of the present invention are superior in adhesive strength and sealing performance as compared with Comparative Examples 9 to 10 which are outside the scope of the present invention. found. When the thickness of the retainer resin layer was less than 1 μm, the retainer resin layer could not be confirmed and could not be adhered. When the retainer resin layer thickness of Comparative Example 9 was 1500 μm, the ink guiding portion was blocked and the ink flow rate became very low.

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

A Writing instrument 10 Writing instrument body 20 Ink occlusion body 30 Relay porous body 40 Pen tip 50 Ink guide part 55 Retaining body

Claims (2)

The pen tip includes a porous body serving as 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 ink contained in the writing tool main body. A writing tool that supplies ink to the writing unit through the ink guiding portion of the holding body and serves as a visual viewing unit that allows the writing direction to be visually recognized, and the ink guiding portion is directed in the longitudinal direction of the holding body. Ink is supplied to the ink guiding portion, and the unevenness of the pores of the porous body in the portion where the rear end surface of the porous body serving as the writing portion and the bottom surface portion of the holding body are in contact with each other is formed from the holding body. The resin constituting the retainer enters and forms the retainer resin layer to fix the porous body and the retainer, and the retainer resin layer on the adhesive surface is formed by 1 to 1000 μm toward the inside of the porous body. At the same time, a writing tool is characterized in that a flange is formed on the outer periphery of the ink guiding portion of the holding body, and the area ratio of the viewing portion is 40% or more of the pen tip protruding from the tip end portion of the writing tool main body. It has a relay porous body for supplying the ink contained in the writing tool main body to the ink guiding portion provided in the holding body, and the holding body and the holding body are inserted into the relay porous body side end surface of the ink guiding portion. A feature is that a retainer resin layer is formed on the boundary surface with the relay porous body over the entire circumference of the end face of the relay porous body , and the retainer resin layer is formed on the entire contact portion between the retainer and the relay porous body. The writing tool according to claim 1.

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