JP2020059213A - Writing instrument - Google Patents

Abstract

To provide a writing instrument capable of ensuring the stability of writing and easily visually recognizing a line drawing portion during writing.SOLUTION: A writing instrument A comprises at least a holding body 40 having a flange portion 42 in contact with an end surface of a barrel 10, and a writing portion 32 forming a space portion 33 via a U-shaped writing core 30. Holes 44, 44 are formed in the holding body 40, the writing core 30 is inserted into the holes 44, 44, and the holding body 40 is arranged on the outer periphery of the writing core 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a writing tool of a type called a paint marker, an oil-based marker, a water-based marker, and an underline marker, and more specifically, it is possible to stably hold a writing core on a barrel of a writing tool, and to draw a line during writing. The present invention relates to a writing instrument capable of easily visually recognizing the like.

Conventionally, writing instruments called paint markers, underline markers, etc., have a wide writing core that enables wide drawing, and they are widely used because they have excellent marking visibility and workability. Has been done.
The writing core in a writing instrument such as a line marker is generally a rod in which synthetic resin fibers are bundled in a rod shape or a porous member such as a polymer sintered body, which gives a capillary action, thereby forming a writing instrument main body shaft. Writing is made possible by drawing out the ink supplied from the pen tip.

  Also, with the spread of writing instruments that house fluorescent ink in the body that is the writing instrument body, many structures that enable wide line drawing, and writing instruments that have a nib with a shape have been marketed, which makes them useful for users. A wide selection of writing instruments can be selected, and the workability is also comfortable.

  The present applicant discloses a writing instrument that has a writing core that can guide and retain ink supplied from a shaft that serves as a writing instrument body, and that has a visible portion (window) at the pen tip for visually recognizing the writing direction. (For example, see Patent Document 1).

  However, in the writing instrument disclosed in Patent Document 1, in the case of a writing part having a single writing core and a transparent shape without a transparent member, it is desired to more stably attach the writing instrument to the barrel. At the present time, it is desired to obtain more stable writing at the time of writing.

Japanese Patent Laid-Open No. 2000-52682 (Claims, FIGS. 1 to 6, etc.)

  The present invention, in view of the current state of the art and the like, is intended to solve this, even in the case of a writing portion with a single writing core without the transparent member, the axis of the writing instrument. An object of the present invention is to provide a writing instrument that can be attached to a cylinder more stably and can provide more stable writing during writing.

  As a result of earnest studies to solve the above-mentioned conventional situation, the present inventor forms a space portion through at least a holding body having a flange portion that comes into contact with the end surface of the barrel and a U-shaped writing core. A writing instrument having a writing part, the holding body having a specific structure, and by such a specific arrangement of the holding body and the writing core, it was found that the writing instrument for the above purpose can be obtained, and the present invention has been completed. It was.

That is, the writing instrument of the present invention is provided with a pen tip having at least a holding body having a flange portion that comes into contact with the end surface of the barrel and a writing portion that forms a space portion via a U-shaped writing core. A hole is formed in the holder, a writing core is inserted into the hole, and the holder is arranged on the outer circumference of the writing core.
The gap between the holder and the writing core is preferably 0.01 mm or more.
The writing parts are provided at both ends of the barrel, and ink flow rates from the writing core are substantially equal to each other. Specifically, it is preferable that the ink flow rate difference between both ends is less than 50 mg / 10 m.
The bending resistance of the writing part is preferably 1 kg or more.

According to the present invention, the writing core can be stably held on the barrel of the writing instrument, and the space portion of the U-shaped writing core does not hinder the visibility at the time of writing, thereby making it possible to draw a line drawing portion during writing. An easily visible writing instrument is provided.
In addition, by forming a gap of 0.01 mm or more between the holding body and the writing core, it is possible to further enhance air replacement and ensure ink circulation.
Further, since the writing parts are provided at both ends of the barrel and the ink flow rates thereof are substantially equal to each other, even if the ink flow rate at one writing part becomes small due to the storage state, the writing is continued by the writing part at the other end. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS It is an example of the embodiment of the writing instrument of this invention, (a) is a top view, (b) is a front view, (c) is a longitudinal cross-sectional view. It is an expansion perspective view of the pen point part on the left side in the writing instrument of FIG. 3A and 3B are drawings showing an example of an embodiment of a holding body at the left pen tip of the writing instrument of FIG. 1, in which FIG. 1A is a perspective view seen from the left side, FIG. 2B is a plan view, and FIG. (D) is a front view, (e) is a right side view, (f) is a longitudinal sectional view, and (g) is a perspective view seen from the rear side. It is an expansion perspective view of the pen point part on the right side in the writing instrument of FIG. It is each drawing which shows an example of embodiment of the holding body in the pen point on the right side in the writing instrument of FIG. 1, (a) is a top view, (b) is the perspective view seen from the front side, (c) is a left side view. , (D) is a front view, (e) is a right side view, (f) is a perspective view seen from the rear side, and (g) is a longitudinal sectional view.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1A to 1C are a plan view, a front view, and a vertical cross-sectional view showing an example of an embodiment of a writing instrument of the present invention, and FIG. 2 is an enlargement of a left pen tip portion of the writing instrument of FIG. 3A to 3G are perspective views showing an example of an embodiment of a holder at the left pen tip, and FIG. 4 is an enlarged perspective view of the right pen tip portion of the writing instrument of FIG. 5 (a) to 5 (g) are drawings showing an example of an embodiment of the holding body in the pen tip on the right side.
As shown in FIGS. 1A to 1C, the writing instrument A according to the present embodiment causes ink to be occluded by the ink occluding body 20 in the barrel 10 which is the writing instrument body, and the pen tip B is attached to one end on the left side. The pen tip C is provided at the other end on the right side, and the ink of the ink occlusion body 20 is supplied to each writing portion 32 of the pen tips B and C by a capillary action. It should be noted that each end of the barrel 10 is provided with caps (not shown) made of a thermoplastic resin such as polypropylene having high airtightness that protects the pen tips B and C that are detachably fitted. is there.

The shaft cylinder 10 is formed of, for example, a thermoplastic resin such as polypropylene, and is composed of a cylindrical body that accommodates the ink occlusion body 20 impregnated with the ink for writing instruments, and has a pen tip on one end side that is the left side. A tip shaft 25 to which B is fixed, and a tip shaft 26 to which the pen tip C is fixed are provided on the other end side on the right side.
The shaft cylinder 10 is formed in a cylindrical shape and functions as the main body (shaft body) of the writing instrument. Further, the front shafts 25 and 26 are respectively formed in a tubular shape, and have convex portions 25a and 26a that are in contact with the open end faces of both ends of the shaft cylinder 10 on the outer peripheral portions near the central portion in the longitudinal direction. , 26a on the rear side (shaft cylinder side) of fitting cylinder parts 25b, 26b to be fitted in the shaft cylinder 10, and front shaft cylinder parts 25c, 26c for fixing the pen tips B, C on the front side. There is.

The ink occlusion body 20 is impregnated with ink for writing instruments such as water-based ink and oil-based ink, and is, for example, natural fiber, animal hair fiber, polyacetal resin, acrylic resin, polyester resin, polyamide resin, polyurethane resin. Resin, polyolefin resin, polyvinyl resin, polycarbonate resin, polyether resin, polyphenylene resin, etc. Fiber bundles made of one kind or a combination of two or more kinds, processed fiber bundles such as felt, and sponge , A resin particle, a sintered body, or other porous body. The ink occlusion body 20 is housed and held in the barrel 10.
Further, the ink occlusion body 20 may be composed of, for example, a thin denier fiber bundle and a plurality of thick denier fiber bundles having a single yarn fineness larger than the single yarn fineness of the thin denier fiber. The single yarn fineness of the thin denier fiber bundle is selected from the range of 1 to 5 denier, and the single yarn fineness of the thick denier fiber bundle is selected from the range of 15 to 20 denier. In this ink occlusion body, thick denier fibers are dispersed and arranged at a plurality of locations (specifically, 1 to 8 locations) in a thin denier fiber bundle. Thick denier fiber bundles have relatively large voids, and thin denier fiber bundles have small voids compared to thick denier fiber bundles.
The thick denier fiber bundle constitutes an ink retaining portion that holds a large amount of ink, and the thin denier fiber bundle constitutes an ink connecting portion that connects the respective ink retaining portions. Each thick denier fiber bundle is surrounded by a thin denier fiber bundle. Since each of the ink storage portions formed by the thick denier fibers has a different cross-sectional shape, the ink of the ink occlusion body is not excessively supplied to each of the nibs B and C and is efficiently supplied in a stable state. be able to.

  In addition, each of the thick denier fiber bundles (ink storage portion) is dispersedly arranged in a portion radially separated from the axial center of the ink occlusion body 20, and at least the rear end portion of the ink guiding portion 31 is connected to the ink. A thin denier fiber bundle is located at the axial center of the occlusion body 20. The ratio of the occupied cross-sectional area of the thick denier fiber bundle to the occupied cross-sectional area of the entire fibers of the ink occlusion body 20 is preferably set in the range of 35% to 60% (more preferably 50% to 60%). By setting this range, a stable and appropriate amount of ink ejection property can be obtained. When the ratio of the occupied cross-sectional area of the thick denier fiber bundle to the occupied cross-sectional area of the entire fiber of the ink occlusion body 20 is less than 35%, the ink ejection property from the pen tip B and the pen tip C becomes insufficient, while the ink occlusion is performed. If the occupied cross-sectional area of the thick denier fiber is larger than 60% of the occupied cross-sectional area of the whole fiber of the body 20, the ink ejection property from the pen tip B and the pen tip C becomes excessive.

The composition of the writing instrument ink to be used is not particularly limited, and depending on the application of the writing instrument and the like, it can be a suitable combination formulation such as an aqueous dye ink, an oil-based ink, a thermochromic ink, for example, an underline pen or the like. Then, the ink may contain a coloring material such as a fluorescent dye, for example, basic violet 11, basic yellow 40, and thermochromic microcapsule pigment.
Preferably, a dye ink or a resin fine particle pigment ink containing a dye is desirable.
The resin fine particle pigment ink containing a dye is a colored resin fine particle composed of at least a cyclohexyl (meth) acrylate monomer and a basic dye or an oil-soluble dye, and contains the cyclohexyl (meth) acrylate monomer. The amount of the coloring resin is 30% by mass or more based on the total amount of the polymer components constituting the colored resin fine particles, and the content of the basic dye or the oil-soluble dye is 15% by weight or more based on the total amount of the polymer components. Examples thereof include a dispersion liquid of colored resin fine particles in which fine particles are dispersed in water, a water-soluble organic solvent, and water.
In addition, these inks have an ink viscosity (25 ° C .: complate type viscometer) of 1 to 5 mPa · s, a surface tension of 30 to 60 mN / m, and the like, which will be described later. It is preferable to set the ink flow rate from the writing portions 32 of the nibs B and C to 50 mg or more and less than 200 mg at a writing distance of 10 m from the viewpoint of the density of the handwriting and the drying property.

Further, when the writing instrument ink is a thermochromic ink, it is preferable to use at least an aqueous ink containing a colorant that discolors due to frictional heat and the like and scale-like silica.
The scale-like silica used is fine particles of thin plate-like silica (SiO ₂ ) having a self-film forming property, and exists as a solid in an aqueous medium in a dispersed state in an ink state, and is gently aligned along a writing surface during writing. At the same time, as the water evaporates, the silanol groups on the silica surface adhere to each other to form a strong coating. Therefore, strong fixability can be imparted to the handwriting.

  As the flake-like silica that can be used, for example, those dispersed in a slurry form with powder or water can be applied, and specifically, flaky primary particles, the flaky primary particles are parallel to each other. Substantially foliate secondary particles formed by stacking to be orientated in the form of (flake silica having a particle structure of a laminated structure), the flaky primary particles are tertiary agglomerated particles tertiary-aggregated in a leaf-like secondary particle form, further These mixtures etc. are mentioned.

The flaky primary particles have a thickness of 0.001 to 0.1 μm. Such flaky primary particles are oriented parallel to each other to form leaf-like silica secondary particles in which one or more sheets are superposed. The thickness of the secondary particles is 0.001 to 3 μm, preferably 0.005 to 2 μm, and the ratio of the longest length of the leaf-shaped secondary particles to the thickness (aspect ratio) is at least 10, preferably 30. As described above, more preferably 50 or more, and the ratio of the longest length of the leaf-shaped secondary particles to the thickness is at least 2, preferably 5 or more, and more preferably 10 or more, and scaly silica is desirable. .
If the thickness of the leaf-shaped secondary particles is less than 0.001 μm, the strength of the leaf-shaped secondary particles becomes insufficient, which is not preferable. The thickness of the secondary particles can be measured by observing fine particles in a scanning electron microscope. Further, the thickness and the particle diameter in the plane direction can be distinguished by measuring the scale of the particle image size photographed by a transmission electron microscope.

  The size of the scale-like silica used is not particularly limited, and those having an average particle diameter of 0.002 to 20 μm, preferably 0.01 to 10 μm, and more preferably 0.01 to 8 μm can be applied. When the average particle size is less than 0.002 μm, the surface area becomes small and it is difficult to obtain sufficient handwriting fixability, and a large amount of addition is required. When it exceeds 20 μm, the ink ejection property during writing may deteriorate. . When tertiary aggregated particles are used, those having an average particle diameter of about 4 to 6 μm are most useful.

  As the method for measuring the average particle diameter, a laser diffraction / scattering type particle size measuring device (for example, Horiba, Ltd., LA-920 type), a dynamic light scattering type particle size distribution measuring device (for example, Horiba, LB) -500 type), a Coulter counter (for example, MA-II type, manufactured by Coulter Electronics Co., Ltd.) and the like are appropriately used according to the range of the particle size.

  The scale-like silica that can be specifically used is not particularly limited as long as it has the above-mentioned properties, and a commercially available product having the above-mentioned properties may be used. For example, a product of AGC SITEC Co., Ltd. Lovely, C, TZ-824, LFS, LFS-C and the like can be mentioned.

  The content of the scaly silica used is preferably 0.1 to 10% by weight, more preferably 0.5 to 5% by weight, based on the total amount of the ink composition. If this content is less than 0.1% by weight, it is difficult to achieve the desired performance, and if it exceeds 10% by weight, no further effect can be obtained, so no further addition is required.

The colorant that discolors due to the frictional heat used is not particularly limited as long as it discolors (erases or discolors) the handwriting by rubbing the handwriting with a friction body or the like and heating it. If there are products, they may be used.
Examples of the thermochromic colorant that can be used include, for example, an electron-donating dye, a leuco dye that functions as a color former, and a developer that serves as a component having the ability to develop the color of the leuco dye and A thermochromic composition containing at least a color-changing temperature adjusting agent capable of controlling the color-changing temperature in the color development of the leuco dye and the developer is prepared by microencapsulation so as to have a predetermined average particle size. Examples of the thermochromic colored resin particles include:
Examples of the microencapsulation method include an interfacial polymerization method, an interfacial polycondensation method, an in situ polymerization method, a liquid hardening coating method, a phase separation method from an aqueous solution, a phase separation method from an organic solvent, a melt dispersion cooling method, and an airborne method. A suspension coating method, a spray drying method and the like can be mentioned, which can be appropriately selected according to the application. For example, in the phase separation method from an aqueous solution, a leuco dye, a color developer, and a discoloration temperature adjusting agent are heated and melted, then added to an emulsifier solution, heated and stirred to disperse in an oil droplet form, and then as a capsule film agent, Wall material uses resin raw material such as urethane resin, epoxy resin, amino resin, etc., for example, amino resin solution, specifically, methylol melamine aqueous solution, urea solution, benzoguanamine solution etc. After the reaction and the preparation, the dispersion is filtered to produce thermochromic colored resin particles composed of thermochromic microcapsule pigments. In the thermochromic colored resin particles, the color development temperature and decolorization temperature of each color can be set to a suitable temperature by suitably combining the types and amounts of the leuco dye, the color developer and the color change temperature adjusting agent. it can.
The thermochromic colored resin particles preferably have reversible thermochromic properties. A reversible thermochromic material is a heat-erasable type that erases color from a color-developed state by heating, a color memory retention type that retains the color-developed state or the color-erased state alternately in a specific temperature range, or a decolorized state. Various types can be used alone or in combination, such as a heat-developing type in which a color is developed by heating and a color is restored to a decolored state by cooling from the developed state.
Further, as the thermochromic ink to be used, specifically, a complete color development temperature is a temperature that can be obtained only in a freezer, a cold region, etc., -30 to -10 ° C, and a complete decolorization temperature is friction heat by a friction body, Effective for maintaining the color that is exhibited in the normal state (daily living temperature range) by specifying the temperature obtained from a familiar heating element such as a hair dryer in the range of 60 to 80 ° C and the ΔH value in the range of 40 to 100 ° C. Can be made to function.

A general-purpose colorant can be used in combination with the thermochromic colorant that undergoes heat erasing or the like.
As the general-purpose colorant, all dyes and pigments that can be dissolved or dispersed in an aqueous medium can be used, and specific examples thereof are shown below.
As the dye, an acid dye, a basic dye, a direct dye or the like can be used.
Examples of the acid dye include neucoccin (C.I. 16255), tartrazine (C.I. 19140), acid blue black 10B (C.I. 20470), guinea green (C.I. 42085), and brilliant. Blue FCF (C.I. 42090), Acid Violet 6B (C.I. 42640), Soluble Blue (C.I. 42755), Naphthalene Green (C.I. 44025), Eosin (C.I. 45380). , Phloxine (CI.45410), Erythrosin (CI.45430), Nigrosine (CI.50420), Acid flavin (CI.56205) and the like are used.
As basic dyes, chrysoidine (CI. 11270), methyl violet FN (CI. 42535), crystal violet (CI. 42555), malachite green (CI. 42000), Victoria blue FB ( CI44045), rhodamine B (CI.45170), acridine orange NS (CI.46005), methylene blue B (CI.52015) and the like are used.
As direct dyes, Congo Red (CI. 22120), Direct Sky Blue 5B (CI. 24400), Violet BB (CI. 27905), Direct Deep Black EX (CI. 30235), Kaya Rust black G conc (CI.35225), direct fast black G (CI.35255), phthalocyanine blue (CI.74180) and the like are used.

Examples of the pigment include inorganic pigments such as carbon black and ultramarine blue, organic pigments such as copper phthalocyanine blue and benzidine yellow, and finely and stably dispersed in an aqueous medium in advance using a surfactant and a resin. Water-dispersed pigment products and the like are used, and examples thereof include C.I. I. Pigment Blue 15: 3B [Product name: Sandy Super Blue GLL, pigment content 24%, Sanyo Dye Co., Ltd.], C.I. I. Pigment Red 146 [Product name: Sandy Super Pink FBL, pigment content 21.5%, Sanyo Dye Co., Ltd.], C.I. I. Pigment Yellow 81 [Product name: TC Yellow FG, pigment content about 30%, manufactured by Dainichiseika Kogyo KK], C.I. I. Pigment Red 220/166 (product name: TC Red FG, pigment content about 35%, manufactured by Dainichiseika Kogyo Co., Ltd.) and the like.
Examples of the resin that disperses the pigment include polyamide resin, polyurethane resin, polyester resin, epoxy resin, melamine resin, phenol resin, silicone resin, polyvinyl alcohol, polyvinylpyrrolidone, polyvinyl acetate, polyvinyl chloride, and polyvinyl chloride. Examples thereof include vinylidene, polystyrene, acrylic acid resin, maleic acid resin, gum arabic, cellulose, dextran, casein, and their derivatives, and copolymers of the above resins.
As the fluorescent pigment, a fluorescent pigment in the form of fine particles of a synthetic resin in which various fluorescent dyes are made into a solid solution in a resin matrix can be used.
In addition, white pigments such as titanium oxide, metal powder pigments such as aluminum, natural mica, synthetic mica, alumina, pearl pigments in which the surface of a core material selected from glass pieces is coated with a metal oxide such as titanium dioxide, cholesteric liquid crystal type. Bright pigments and the like can also be used.
The colorants may be used alone or in admixture of two or more, and are used in the ink composition in an amount of 1 to 35% by mass, preferably 2 to 30% by mass.

Further, a conventional water-soluble organic solvent that is compatible with water can be used, for example, ethanol, propanol, butanol, glycerin, sorbitol, triethanolamine, diethanolamine, monoethanolamine, ethylene glycol, diethylene glycol, thiodiethylene glycol. , Hexylene glycol, 1,3-butanediol, neoprene glycol, polyethylene glycol, propylene glycol, butylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, ethylene glycol monomethyl ether acetate, Propylene glycol monomethyl ether, propylene glycol Monoethyl ether, 2-pyrrolidone, N- methyl-2-pyrrolidone.
The water-soluble organic solvent may be used alone or in combination of two or more, and is used in the ink composition in an amount of 2 to 60% by mass, preferably 5 to 35% by mass.

In addition, if necessary, inorganic salts such as sodium carbonate, sodium phosphate, sodium acetate, pH adjusting agents such as organic basic compounds such as water-soluble amine compounds, rust preventives such as benzotriazole, tolyltriazole, saponin, etc. , Folic acid, sodium salt of 1,2-benzthiazolin-3-one, sodium benzoate, sodium dehydroacetate, potassium sorbate, propyl paraoxybenzoate, 2,3,5,6-tetrachloro-4- (methylsulfonyl) Antiseptic or antifungal agent such as pyridine, urea, sorbit, mannitol, sucrose, glucose, reduced starch hydrolyzate, wetting agent such as sodium pyrophosphate, antifoaming agent, fluorine-based interface for improving ink permeability An activator or a nonionic surfactant may be used.
Further, a lubricant can be added, and metal soap, polyalkylene glycol fatty acid ester, ethylene oxide addition type cationic surfactant, phosphate ester type surfactant, N-acyl amino acid type surfactant, dicarboxylic acid type surfactant , Β-alanine type surfactant, 2,5-dimercapto-1,3,4-thiadiazole or a salt or oligomer thereof, 3-amino-5-mercapto-1,2,4-triazole, thiocarbamate, dimethyl Dithiocarbamate, α-lipoic acid, a condensate of N-acyl-L-glutamic acid and L-lysine, or a salt thereof is used.
Further, N-vinyl-2-pyrrolidone oligomer, N-vinyl-2-piperidone oligomer, N-vinyl-2-pyrrolidone, N-cyclohexyl-2-pyrrolidone, ε-caprolactam, N-vinyl-ε-caprolactam By adding a thickening inhibitor such as an oligomer, it is possible to enhance the function in the retractable form.

  Further, alkyd resin, acrylic resin, styrene-maleic acid copolymer, cellulose derivative, polyvinylpyrrolidone, polyvinyl alcohol, one or more water-soluble resins such as dextrin are added in a range not impairing the drying resistance, or urea, One or more nonionic surfactants, sorbit, mannitol, sucrose, glucose, reduced starch hydrolyzate, sodium pyrophosphate, and other wetting agents may be contained.

The aqueous ink may also contain a shear thinning agent.
As the shear thinning agent, a water-soluble or dispersible substance is effective, and xanthan gum, welan gum, zeta-sea gum, diutan gum, macrohomopsis gum, macromonopse gum, organic acid-modified hetero of glucose and galactose are constituent monosaccharides. A succinoglycan that is a polysaccharide (average molecular weight of about 1 to 8 million), guar gum, locust bean gum and its derivatives, hydroxyethyl cellulose, alginic acid alkyl esters, and a molecular weight of 100,000 to 150,000 mainly containing alkyl esters of methacrylic acid. , Glucomannan, carbohydrates having gelling ability extracted from seaweeds such as agar and carrageenin, poly N-vinyl-carboxylic acid amide cross-linked product, benzylidene sorbitol and benzylidene xylitol or their derivatives, cross-linkable acrylic acid polymer. Coalescing Inorganic fine particles, nonionic surfactants having an HLB value of 8 to 12, can be exemplified metal salts and amine salts of dialkyl sulfosuccinate. Furthermore, N-alkyl-2-pyrrolidone and an anionic surfactant may be used in combination in the ink composition. The shear thinning viscosity imparting agent may be used in the range of 0.1 to 20% by weight in the ink composition.

  When the above thermochromic ink is used, a thermoplastic elastomer (friction body) having a pencil drawing line erasing ability (erasing rate) of less than 70% and containing a plasticizer specified in JIS S 6050-2002 is used as a cap of a writing instrument. It is preferably formed at the top or open end (not shown). By providing this friction body, frictional heat can be easily generated by the rubbing operation of the friction body, and the handwriting with the thermochromic ink can be easily discolored (discolored or erased) by the frictional heat, and the surface of the handwritten paper etc. Can be used without hurting.

The pen tip B has at least a writing core 30 that serves as a pen core, and a holder 40 that holds the writing core 30.
As shown in FIGS. 1 and 2, the writing core 30 is substantially U-shaped, and includes an ink guiding portion 31, 31 and a writing portion 32 for leading out ink from the ink guiding portion 31, 31. A rectangular (trapezoidal) space portion (passing portion) 33 through which a drawn portion or the like during writing can be easily visually recognized is formed on the inner side through the U-shaped writing core 30. In addition, in the present invention, the "U-shape" includes a U-shape and the like, and the writing portion 32 and the space portion (blank portion) 33 in which a drawn portion and the like during writing are easily visible are formed inside. Anything that allows a structure is acceptable. Moreover, it is preferable that the space portion (the plain portion) 33 has an opening area of 10 to 60 mm ^{2 in} the direction of FIG.

The writing core 30 is made of a porous member because it has a good ink outflow property. For example, the writing core 30 is made of natural fiber, animal hair fiber, polyacetal resin, polyethylene resin, acrylic resin, polyester resin, polyamide resin, polyurethane resin, polyolefin resin, polyvinyl resin, polycarbonate resin. A parallel fiber bundle consisting of one kind or a combination of two or more kinds of a polyether resin, a polyphenylene resin, etc., a fiber core processed by processing a fiber bundle such as felt or a resin processing of these fiber bundles, or a polyolefin resin, It is composed of a porous body (sintered core) obtained by sintering a plastic powder such as a thermoplastic resin such as an acrylic resin, a polyester resin, a polyamide resin, or a polyurethane resin.
The preferred writing core 30 is a fiber bundle core, a fiber core, a sintered core, a felt core, a sponge core, or an inorganic porous material core, and particularly preferably, deformation moldability, productivity, and shape retention. From the viewpoint, a sintered core is desirable. The writing core 30 of the present embodiment includes a sintered core (sintered body) having a porosity of 55% obtained by sintering polyethylene powder having an average particle diameter of 200 μm, and a reinforcing material 35 that reinforces the sintered core. . In the present invention, the “average particle diameter” means the average value of the diameters of the particles measured by an electron microscope, and the average value of the particle diameters measured for 20 particles in the image projected on the electron microscope. Is. If the particle is not circular, the length of the longest line segment and the length of the shortest line segment among the line segments that connect any two points of the contour that forms the pores, and divide by 2 The particle size of
The porosity is calculated as follows. First, the writing core 30 having a known mass and apparent volume is dipped in water to sufficiently soak the water, and then the mass is measured in a state of being taken out from the water. From the measured mass, the volume of water soaked in the writing core 30 is derived. The porosity is calculated from the following formula (A), assuming that the volume of this water is the same as the pore volume of the pen core.
Porosity (unit:%) = (volume of water) / (apparent volume of writing core) × 100 (A)

In addition, even if the writing pressure is strong, the writing core 30 is reinforced from the viewpoint of maintaining the shape retention of the writing core 30 having a space portion (blank portion) and further improving the bending resistance. The member 35, in the present embodiment, has a metal (wire material) integrally.
As the material of the reinforcing member 35 to be used, in addition to the above-mentioned metal (wire material), resin, carbon fiber, etc., having a shear resistance higher than that of the writing core 30, and having a diameter less than 50% of the core diameter of the writing core 30. Is preferred.
More preferably, the bending resistance of the writing portion 32 is 1 kg or more from the viewpoint of further maintaining good writing performance, the shape retention of the writing core 30, and the preferable ink outflow property. In the present invention, the "bending resistance" means a value measured as a load at which the pen tip is plastically deformed by inclining the writing instrument against the writing surface at an angle of 65 ° and pressing it against the paper surface.
The reinforcing member 35 may not be used as long as the bending resistance can be maintained by appropriately adjusting the material type and manufacturing method of the writing core 30.

The length in the width direction of the writing core 30 of the present embodiment is preferably 0.50 mm or more, and particularly preferably 1.00 to 3.00 mm from the viewpoint of ensuring a sufficient writing flow rate.
The writing unit 32 may have an inclined shape (knife cut shape) so as to have an inclination for easy writing, and the inclination and the like are appropriately set according to the convenience of writing. The writing portion 32 has a large drawn line width, preferably the drawn line width is 1 mm or more, and more preferably the drawn line width is 2 mm or more.

As shown in FIGS. 1, 2 and 3 (a) to 3 (g), the holding body 40 fixes the writing core 30 serving as a pen core and is fixed in the tip opening of the tip shaft 25 of the barrel 10. The main body 41 is a bulging body, the flange 42 is in front of the main body 41 and is in contact with the end surface of the barrel 10, and the main body 41 has a flange surface 43 on the side of the flange surface 43. Penetrating hole portions 44, 44 into which the ink guiding portions 31, 31 of the wick 30 are inserted are formed, and the ink guiding portions 31, 44 are formed on the upper and lower sides from the inside of the body portion 41 of the hole portions 44, 44 toward the rear side. Recessed holding portions 45, 45 for fitting and holding 31 are formed. As shown in FIG. 3 (f), the holding portions 45, 45 are formed with a reduction portion 46 in which the distance on the rear side of the ink guiding portions 31, 31 is sequentially reduced to form a rear portion of the ink guiding portions 31, 31. The design is such that 31a and 31a are securely inserted into predetermined positions in the ink guide 20 in the barrel 10.
Further, a concave fitting portion 47 is formed on the outer peripheral surface in the width direction of the main body portion 41, and a straight air circulating groove 48 and a curved air circulating groove are formed in the double-sided air circulating grooves serving as the longitudinal outer peripheral surface, respectively. A groove 49 is formed.

The entire holding body 40 configured in this manner is made of a hard material, for example, metal, glass, resin having no rubber elasticity, or the like. Specifically, for example, 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 from a resin material. As described above, it is possible to easily visually recognize the line drawing portion and the like during writing in the space portion 33 of the writing core 30, and the holding body 40 is attached to the leading shaft 25 as will be described later. Since it is fixed inside, the holder 40 need not have visibility.
Further, the holding body 40 may be formed of one kind of each of the above materials, or two or more kinds of materials from the viewpoint of further improving durability, and various moldings such as injection molding and blow molding. It can be molded by the method.

In the pen tip B, the writing core 30 is fixed (attached) to the holding body 40 by attaching the end portions of the ink guiding portions 31, 31 of the writing core 30 to the through-holes 44, 44 of the holding body 40. The writing portion 32 of the writing core 30 which is not fixed by the flange portion 42 which is fixed by being inserted and fitted into the holding grooves 45, 45 and which comes into contact with the end surface of the barrel 10 and the line drawing portion during writing. The easily visible space portion (blank portion) 33 serves as the pen tip portion. This holding body 40 has a structure in which it is fixed in one opening of the barrel 10 except for the flange surface 43. Furthermore, in order to ensure the fixation (removal prevention) of the writing core 30, adhesion by an adhesive, welding, or the like may be further used at the fixed position.
Between the holding body 40 and the ink guiding portions 31, 31 of the writing core 30, it is preferable that a gap be formed in a circumferential shape at the time of insertion from the viewpoint of further increasing air displacement and ensuring an ink circulation amount. It is desirable that this gap be 0.01 to 0.5 mm.
Although the holes 44, 44 have a rectangular shape in the drawings (FIGS. 2 and 3), the holes 44, 44 are not particularly limited as long as the ink guiding parts 31, 31 of the writing core can be inserted and gaps can be formed. It may be circular or the like along the cross-sectional shape or the like.

  The pen tip B configured in this manner has at least a holder 40 having a flange portion 42 that abuts one end surface of the barrel 10 and a writing portion that forms a space portion 33 via a U-shaped writing core 30. And a rear part side 31a, 31a of the writing core 30 is inserted into the holes 44, 44 to form an outer periphery of the writing core 30. The holding body 40 is arranged. In the pen tip B, the ink is supplied from the ink occlusion body 20 and the rear side 31a, 31a of the ink guide portions 31, 31 to the writing portion 32 by a capillary action and is used for writing.

Further, in the present embodiment, the pen tip C is provided on the other end surface of the barrel 10. In the case where the pen tip B has the same configuration as that of the pen tip B in FIGS. 1 to 3, the same reference numeral as that of the pen tip B is given and the description thereof is omitted.
The pen tip C has at least a writing core 30 that serves as a pen core, and a holder 40 that holds the writing core 30.
The pen tip C has hollow pillar-shaped guide portions 44a and 44a in place of the hole portion 44 of the holding body 40, in that the writing core 30 has a U-shaped cross section, does not have the reinforcing member 35. It is different from the pen tip B in that it is formed.
When the configuration is the same as that of FIGS. 1 to 3, the same reference numerals as those of the pen tip B are given, and the description thereof will be omitted.

The writing core 30 has a U-shape, and includes an ink guiding portion 31, 31 and a writing portion 32 for leading out ink from the ink guiding portion 31, 31 like the pen tip B and the writing core. A rectangular space portion (passing portion) 33 is formed on the inside through the U-shaped writing core so that a drawn portion or the like during writing can be easily visually recognized.
As shown in FIGS. 1, 4 and 5, from the inside of the main body portion 41 of the holding body 40 of the present embodiment to the writing portion 32 (front) side, a hollow columnar guide portion 44 a for guiding the ink guiding portions 31, 31. , 44a are formed so as to prevent the writing part 32 and the like from being damaged or bent, and prevent the ruler or the like from becoming dirty during use. Between the guide portions 44a and 44a and the ink guiding portions 31 and 31 of the writing core 30, it is preferable to have a circumferential gap from the viewpoint of increasing the air displacement and ensuring the ink circulation amount. The gap is preferably 0.01 to 0.5 mm.
In the drawings (FIGS. 4 and 5), the guide portions 44a and 44a are formed in a quadrangular shape so as to be easily applied to a ruler or the like. However, if the ink guide portions 31 and 31 of the writing core can be inserted and a gap can be formed. The shape is not particularly limited, and may be circular or the like along the cross-sectional shape of the ink. Further, in the drawings (FIGS. 4 and 5), the guide portion 44a is preferably integrally formed with the main body portion 41 by a synthetic resin or the like, but the guide portion 44a is formed by a metal pipe or the like to synthesize the main body portion 41. It may be in the form of a separate member formed by adhesion or the like as the resin.

The pen tip C configured in this way has at least a holder 40 having a flange portion 42 that abuts on the other end surface of the barrel 10, and a writing portion that forms a space portion 33 via a U-shaped writing core 30. The holding body 40 has holes 44, 44 and hollow guide portions 44a, 44a formed on the front side thereof, and the guide portions 44a, 44a are provided with the writing core 30. The rear side is inserted, and the holding body 40 is arranged on the outer circumference of the writing core 30.
The pen tip C is also supplied with ink by a capillary action from the rear side 31a, 31a of the ink guide portion 31, 31 guided by the ink occlusion body 20 and the hollow guide portions 44a, 44a to the writing portion 32 by a capillary action. Will be offered to.

The ink flow rates to the pen tips B and C provided at both ends of the barrel 10 are preferably substantially equal, and more preferably, the ink flow rate difference between the writing parts 32 of the writing cores 30 at both ends is 10 m. It is desirable that the writing distance is less than 50 mg. As a result, even if the ink flow rate at the writing portion 32 at one end becomes small (even if the drawn line becomes thin) depending on the storage state, the writing portion 32 at the other end can continue writing.
In order to make the ink flow rates to the pen tips B and C provided at both ends of the barrel 10 substantially equal, it is easy to make the writing cores 30 and 30 have the same material and porosity. It can be carried out.

In the writing instrument A configured as described above, at least the holding body 40 having the flange portion 42 that abuts on the end surface of the barrel 10 and the writing portion 32 that forms the space portion 33 via the U-shaped writing core 30. And a pen nib B, C having a hole. The holder 40 is formed with holes 44, 44, and the ink guiding parts 31, 31 of the writing core 30 are inserted into the holes 44, 44. Since the holding body 40 is arranged on the outer circumference of the writing core 30, the writing core 30 can be stably held on the barrel 10 of the writing tool, and the space portion of the U-shaped writing core 32 is provided. 33 makes it easy to visually recognize a line drawing portion or the like during writing.
By setting the bending resistance of the writing portion 32 to 1 kg or more in the pen tip B, even the writing portion 32 having the space portion 33 can continue writing without being deformed.
Further, in the nib C, the holder 40 is formed with hollow columnar guide portions 44a and 44a for guiding the ink guiding portions 31 and 31 of the writing core 30, thereby preventing damage and bending of the writing portion 32 and the like. It has a structure that keeps the rulers, etc. from getting dirty. Further, by forming a gap of 0.01 mm or more between the hole portions 44, 44 or the guide portions 44a, 44a and the ink guiding portions 31, 31 of the writing core 30, the air displacement is further increased and the ink flowability is improved. It can be secured.

The writing instrument A according to the present embodiment has a configuration including the pen tip B and the pen tip C having the above-described configurations, but the invention is not limited to the above-described embodiments and the like, and various changes are made without departing from the technical idea of the present invention. can do.
For example, in the above-described embodiment, the pen tip is a twin type (pen tip B, pen tip C) writing tool, but the open end of one of the barrels 10 is closed (bottomed cylinder shape), and the pen tip B or It may be a single-type writing instrument equipped with a pen tip C.
Further, in the above-described embodiment, the writing core 30 was described in detail as a sintered core type. However, the writing core 30 may be a fiber bundle, a fiber core, a foam, a sponge body, or a felt body as described above, in addition to the sintered body. And so on.
Further, in the above-described embodiment, the writing tool of the system (filling type) in which the ink occluded in the ink occluding body 20 is efficiently supplied to the writing section 32 of the writing core 30 by the capillary force is shown, but the writing device is provided with a valve mechanism. A writing instrument, for example, an ink chamber in which ink is directly contained is provided in a shaft serving as a writing instrument body, a valve mechanism is provided between the ink chamber and the writing core, and a spring of the valve mechanism is attached by a pressing movement in a pen tip direction. It may be a writing instrument having a structure in which the valve rod is retracted against the force to release the valve portion to draw out the ink and supply the ink to the pen core. The single type may be a knock-type writing instrument.

Furthermore, in the writing instrument A of the above embodiment, the cross section of the shaft body of the writing instrument main body is formed into a circular axis, but it may be formed in an irregular shape such as a triangular shape, a square shape of a square or more, or an elliptical shape.
Furthermore, in each of the above-described embodiments, the ink for a writing instrument (water-based dye ink, oil-based ink, thermochromic ink, resin fine particle pigment ink containing a dye) has been described, but a liquid cosmetic, a liquid drug, a coating liquid, a correction liquid. It may be a liquid such as.

In the writing instrument A provided with the nibs B and C of the embodiment conforming to FIGS. 1 to 5, the holding body 40 having the flange portion 42 that abuts the end surface of the barrel 10 and the U-shaped writing core 30 are interposed. The pen tips B and C having a writing section 32 that forms a space 33 are formed by forming holes 44 and 44 in the holder 40 and writing in the holes 44 and 44. By inserting the ink guiding portions 31, 31 of the lead 30 and arranging the holder 40 on the outer periphery of the writing lead 30, the writing lead 30 can be held stably on the barrel 10 of the writing instrument. The space portion 33 of the U-shaped writing core 32 makes it easy to visually recognize the drawn portion and the like during writing.
By setting the bending resistance of the writing portion 32 to 1 kg or more in the pen tip B, even the writing portion 32 having the space portion 33 can continue writing without being deformed.
Further, in the nib C, the holder 40 is formed with hollow columnar guide portions 44a and 44a for guiding the ink guiding portions 31 and 31 of the writing core 30, thereby preventing damage and bending of the writing portion 32 and the like. It has a structure that keeps the rulers, etc. from getting dirty. Further, by forming a gap of 0.01 mm or more between the hole portions 44, 44 or the guide portions 44a, 44a and the ink guiding portions 31, 31 of the writing core 30, the air displacement is further increased and the ink flowability is improved. It was confirmed that it would be a writing instrument using a pen tip that can be secured.

Further, the writing instrument was set in an automatic writing device, and a writing angle of 65 °, a writing load of 1 N, a speed of 7 cm / s and a distance of 100 m were applied on a high-quality paper surface in accordance with the test method according to JIS S6037, and then the drawn line was drawn. When the state was visually confirmed, since the ink composition having the above preferable ink composition was used, the ink flow rate of the pen tip B (70 mg at 10 m) and the ink flow rate of the pen tip C (80 mg at 10 m) were both good, It was found that, while suppressing the drying of the pen tip, it is excellent in the dryness of the drawn line and the low-temperature stability of the ink, and exhibits a function without bleeding or strikethrough in the drawn line.
In addition, the difference in ink flow rate between the writing parts 32, 32 at both ends is 10 mg / 10 m, and even if the ink flow rate becomes low in the writing part 32 at one end (even if the drawing line becomes thin) depending on the storage state, It was confirmed by the writing unit 32 that writing could be continued.

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

A Writing tool B Pen tip C Pen tip 10 Shaft cylinder 20 Ink occlusion body 30 Writing core 31 Ink guiding part 32 Writing part 33 Space part (blank part)
40 Holder 44 Hole

Claims (4)

  A writing instrument having at least a holding body having a flange portion that comes into contact with an end surface of a shaft cylinder, and a writing portion that forms a space portion via a U-shaped writing core, wherein a hole portion is formed in the holding body. A writing instrument, wherein a writing core is inserted into the hole and a holder is arranged on the outer periphery of the writing core.   The writing instrument according to claim 1, wherein a gap between the holder and the writing core is 0.01 mm or more.   The writing instrument according to claim 1 or 2, wherein the writing unit is provided at both ends of the barrel and the ink flow rates thereof are substantially equal.   The writing instrument according to any one of claims 1 to 3, wherein the bending resistance of the writing portion is 1 kg or more.

Images