JP2018134736A - Writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing tool capable of securely fixing a writing core to a holding body with a simple structure and manufacturing means and also stabilizing an assembling process and being manufactured at a low cost, and a manufacturing method thereof.SOLUTION: There is provided a writing instrument A having a writing portion comprising at least a writing core 30 made of a porous body and a holding body 40 holding the writing core 30, in which the writing core 30 is made by attaching a writing core before deformation to the holding body 40 and deforming it by plastic working to form the writing core 40 along the shape of the holding body to be held in close contact with each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a writing instrument having a writing core capable of guiding and retaining ink supplied from a writing instrument shaft, and more specifically, a writing instrument of a type generally referred to as a paint marker, an oil marker, an aqueous marker, or an underline marker. About.

Traditionally, writing tools called paint markers, underline markers, etc., have a wide writing core that enables wide line drawing and is widely used because of its excellent marking visibility and workability. Has been.
The writing core in a writing instrument such as a line marker is generally a shaft body that provides a capillary action to a porous member such as a synthetic resin fiber converged in a rod-like shape or a polymer sintered body, thereby forming a writing instrument body. The ink supplied from the printer can be written by deriving the ink to the pen tip.

  In addition, with the widespread use of writing instruments that contain fluorescent ink in the shaft, which is the main body of the writing instrument, writing instruments having many structures and shapes that enable wide drawing are commercially available. A wide selection of writing instruments can be selected, and the workability is also comfortable.

The present applicant discloses a writing instrument having a visible portion (window) that can visually recognize the writing direction at a pen tip in a writing instrument having a writing core that can guide and hold ink supplied from a shaft body serving as a writing instrument body. (For example, refer to Patent Document 1).
With this type of writing tool, you can see the written characters from the visible part (window) of the nib, so you can draw lines without sticking out only where you want to check. Specifically, the ink is occluded in the ink occlusion body in the shaft that is the writing instrument body, and has a pen body made of a thin-type writing core at one end and a pen body made of a bold-type writing core at the other end. The ink of the occlusion body is supplied to the bold pen body and the thin pen body, respectively.

  As shown in FIGS. 5A to 5C, a pen body 1 made of a bold type writing core in this writing instrument is a substantially U-shaped porous body formed along the outer peripheral shape of the holding body 2. The writing core 5 having the ink guiding portions 3 and 3 made of the members and the inclined writing portion 4 was attached. As shown in FIGS. 5 (b) and 5 (c), the holding body 2 is composed of a substantially U-shaped porous member including ink guiding portions 3 and 3 and an inclined writing portion 4 on the outer peripheral surface thereof. A fitting groove for fitting the writing core 5 is formed. In the pen body 1 of this embodiment, since the holding body 2 is a member having visibility made of a transparent resin or the like, the holding body 2 becomes a visible portion, and the writing direction can be visually recognized.

  In this pen body 1, the attachment to the holding body 2 of the writing core 5 having the ink guiding portions 3 and 3 made of a substantially U-shaped porous member and the inclined writing portion 4 is performed by fitting, bonding, or the like. It is done by.

  However, the pen body 1 has a writing core 5 having a shape determined in advance so as to follow the shape of the holding body 2, that is, a writing body having ink guiding portions 3 and 3 made of a substantially U-shaped porous member and an inclined portion. Since the writing core 5 provided with the part 4 is attached to the holding body 2, the writing core must be manufactured along the mounting shape of the holding body, and each time the mounting shape of the holding body is different, As a result, a writing core that conforms to the shape is manufactured, and the productivity of the writing core is inferior and the cost is high. In addition, the productivity of writing instruments having writing cores of various shapes is impaired.

JP 2000-52682 A (Claims, paragraph 0014, FIGS. 7, 24, 25, etc.)

  The present invention has been made in view of the above-described problems of the prior art, and is intended to solve this problem. With a simple structure and manufacturing method, the writing core is securely fixed to the holder, and the assembly process is stabilized and the cost is low. It is an object to provide a writing instrument that can be manufactured with

  As a result of intensive studies to solve the above-described conventional problems, the present inventors at least in a writing instrument in which a writing part is composed of a writing core made of a porous body and a holding body that holds the writing core. The writing core has been found to be able to obtain the above-mentioned writing instrument by attaching the unwritten core to the holder and applying a specific process, and has completed the present invention.

That is, the writing instrument of the present invention is a writing instrument in which a writing part is composed of at least a writing core made of a porous body and a holding body that holds the writing core, and the writing core holds the writing core before deformation. It is attached and deformed, and a writing core is formed along the shape of the holding body and is held in close contact.
Preferably, the writing core includes an ink guiding portion and a writing portion for deriving ink from the ink guiding portion, and the flat writing portion is formed into an inclined writing portion by deformation due to plastic working.
The method for producing a writing instrument according to the present invention is a method for producing a writing instrument in which a writing part is constituted by at least a writing core made of a porous body and a holding body for holding the writing core, and the writing core is a writing before deformation. After the core is attached to the holding body, the writing core is deformed into a writing core along the shape of the holding body by plastic working to produce a writing instrument that is closely held.

  ADVANTAGE OF THE INVENTION According to this invention, while having a simple structure and a manufacturing means, a writing core can be reliably fixed to a holding body, an assembly process can be stabilized, and it can manufacture at low cost.

An example of embodiment of the writing instrument of this invention is shown, (a) is a longitudinal cross-sectional view, (b) is a top view, (c) is a front view. It is drawing which shows the process of attaching a writing core to a holding body, (a) is a front view of the writing core before a deformation | transformation, (b) is a longitudinal cross-sectional view of the holding body to which a writing core is attached, (c) is before deformation (plasticity) It is a longitudinal cross-sectional view which shows the state which attached the writing core before processing to the holding body. (A)-(f) is each drawing which shows an example of a holding body, (a) is a top view, (b) is a front view, (c) is a longitudinal cross-sectional view, (d) is a left view, (E) is a right side view, and (f) is a central cross-sectional view. (A)-(f) is each drawing which shows an example of the state which attached the writing core to the holding body, (a) is a top view, (b) is a front view, (c) is a longitudinal cross-sectional view, ( d) is a left side view, (e) is a right side view, and (f) is a central cross-sectional view. It is drawing which shows the process of attaching the writing core in the conventional writing instrument to a holding body, (a) is a front view of the writing core formed along the attachment surface aspect of a holding body, (b) is the holding which attaches the writing core. The longitudinal cross-sectional view of a body, (c) is a longitudinal cross-sectional view which shows the state which attached the writing core of (a) to the holding body.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 4 show an example of an embodiment of the writing instrument of the present invention. FIGS. 1 (a) to 1 (c) are a longitudinal sectional view, a plan view, and a front view of the writing instrument, respectively. FIGS. 3A to 3F are drawings showing examples of the holding body, and FIGS. 4A to 4F are diagrams showing the steps of attaching the writing core to the holding body. It is each drawing which shows an example of the state which attached the writing core to.
As shown in FIG. 1, the writing instrument A of the present embodiment includes a shaft body 10, an ink occlusion body 20, a writing core 30, a holding body 40, and a cap 50 serving as a writing instrument body.

The shaft body 10 is formed of, for example, a thermoplastic resin, a thermosetting resin, or the like, and, as shown in FIG. 1A, a bottomed cylinder that houses an ink storage body 20 impregnated with ink for a writing instrument. And a front shaft 15 to which a holding body 40 to which a writing core 30 as a pen tip is attached is fixed.
The rear shaft 11 is formed into a bottomed cylindrical shape using, for example, a resin made of polypropylene or the like, and functions as a main body (shaft body) of the writing instrument. As shown in FIG. 1A, the rear shaft 11 is provided with a holding member 13 including holding pieces 12, 12... For holding the rear end portion of the ink storage body 20 inside the rear end side. The entire shaft and the tip shaft described later are formed to be opaque or transparent (and translucent), but any of them may be adopted from the viewpoint of appearance and practical use. Further, the front shaft 15 is fixed to the front side of the rear shaft 11 by fitting or the like. When the ink for the writing instrument is a thermochromic ink, it is preferable that a thermoplastic elastomer is formed on the outer surface or the rear end portion of the rear shaft 11 to form a shaft body that easily generates frictional heat by a rubbing operation. .
The front shaft 15 is provided with a convex fitting portion 16 for fixing a main body portion 41 of a holding body 40 for fixing a writing core 30 described later. For example, the front shaft 15 of this structure is formed of a resin made of polypropylene (PP) or the like.

The ink occlusion body 20 is impregnated with ink for writing instruments such as water-based ink and oil-based ink. For example, natural fibers, animal hair fibers, polyacetal resins, acrylic resins, polyester resins, polyamide resins, polyurethane resins. Resin, polyolefin-based resin, polyvinyl-based resin, polycarbonate-based resin, polyether-based resin, polyphenylene-based resin or other fiber bundles, processed fiber bundles such as felt, and sponge , Including porous bodies such as resin particles and sintered bodies. The ink occlusion body 20 is accommodated and held in the rear shaft 11 which is a main body portion of the shaft body 10.
Further, the ink composition to be used is not particularly limited, and can be a suitable blended formulation such as a water-based ink, an oil-based ink, a thermochromic ink, etc., depending on the application of the writing instrument. Fluorescent dyes such as basic violet 11, basic yellow 40, thermochromic microcapsule pigments and the like can be included.

As shown in FIG. 2A, the writing core 30 before being deformed before being attached to the holding body 40 has a 90-degree U-shape, and includes ink guiding portions 31 and 31 and the ink. And a writing unit 32 for deriving ink from the guiding units 31 and 31. The ink guiding portions 31 and 31 before deformation are linear, and the bottom surface (writing surface) 32a of the writing portion 32 is a parallel surface.
The writing core 30 is composed of a porous member. For example, natural fibers, animal hair fibers, polyacetal resins, polyethylene resins, acrylic resins, polyester resins, polyamide resins, polyurethane resins, Processing fiber bundles such as parallel fiber bundles or felts made of one or a combination of two or more of polyolefin resins, polyvinyl resins, polycarbonate resins, polyether resins, polyphenylene resins, etc., or resin these fiber bundles It consists of a processed fiber core or a porous body (sintered core) obtained by sintering a plastic powder such as a thermoplastic resin such as a polyolefin resin, an acrylic resin, a polyester resin, a polyamide resin, or a polyurethane resin. Is.
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 body core, and particularly preferably a sintered core is used from the viewpoint of deformation moldability and productivity. desirable.
Further, the porosity, size, hardness, and the like of the writing core 30 to be used vary depending on the ink type, the type of writing instrument, and the like. For example, the porosity is preferably 30 to 60%. In this embodiment, it is composed of a sintered core (sintered body) having a porosity of 55% obtained by sintering polyethylene powder having an average particle diameter of 200 μm. In addition, an average particle diameter shows the average value of the diameter of the particle | grains measured with the electron microscope, and is an average value of the particle diameter measured about 20 particle | grains in the image projected on the electron microscope. When the particle is not circular, the value obtained by adding the length of the longest line segment and the length of the shortest line segment and dividing the result by 2 among the line segments connecting any two points of the outline forming the pores. Particle diameter.
The porosity is calculated as follows. First, a writing core having a known mass and an apparent volume is immersed in water, sufficiently infused with water, and then the mass is measured while being taken out from the water. From the measured mass, the volume of water soaked into the writing core is derived. The porosity is calculated from the following formula (A), assuming that the volume of water is the same as the pore volume of the writing core.
Porosity (unit:%) = (volume of water) / (apparent volume of writing core) × 100 (A)

As shown in FIGS. 2B and 3A to 3F, the holding body 40 has a substantially elliptical columnar main body 41, a flange 42 on the front side of the main body 41, and a writing direction. And a rear holding portion 45 having a holding piece 44 connected to the main body portion 41 on the rear side of the main body portion 41. In addition, a holding groove 46 for fitting and holding the U-shaped writing core 30 before deformation is formed on the entire outer circumferential surface in the longitudinal direction of the holding body 40 constituted by these members.
A concave fitting portion 41a is formed on the outer circumferential surface of the main body 41 in the width direction, and air circulation grooves 41b and 41b are formed on the outer circumferential surface in the longitudinal direction.

  In the present embodiment, the front surface portion 47 of the holding groove 46, which is a portion in contact with the writing portion 32 of the writing core 30, is prevented from being displaced at the time of writing or the like of the writing portion 32 to ensure the holding. A non-smooth surface portion 48 is formed in which the uneven step is a minute uneven shape.

The entire holding body 40 configured in this way is made of a material having visibility and flexibility, such as PP, PE, PET, PEN, nylon (6 nylon, 12 nylon, and other general nylons). (Including nylon and the like), acrylic, polymethylpentene, polystyrene, ABS, and the like by molding, the characters written in the writing direction at the visible portion 43 can be effectively visually recognized. In addition, you may comprise only the visible part 43 with the material which has visibility.
In addition, the holding body 40 may be configured by using one or more kinds of the above materials, or two or more kinds of materials from the viewpoint of further improving durability and visibility, and injection molding, blow molding, etc. It can shape | mold by these various shaping | molding methods.

In the present invention, the writing core 30 before deformation shown in FIG. 2 (a) is attached to the holding body 40 having the above-mentioned configuration (FIG. 2 (c)) and deformed by plastic working, and shown in FIG. 4 (c). A writing core 30 is formed along the shape of the holding body 40, and the writing core 30 is tightly held on the holding body 40.
In the present invention, “plastic processing (plastic processing)” means processing (processing) in a state in which external force and / or heat exceeding the elastic deformation region is applied to the writing core 30 to cause permanent deformation of the writing core 30. For example, it refers to heat treatment, pressure treatment, press treatment, tension treatment, and combinations thereof.

Preferably, the plastic working is a pressing process, and more preferably, the pressing process and heat treatment are combined. As an example of plastic processing, as described above, the writing core 30 is processed into a fiber bundle such as a thermoplastic resin such as a polyolefin resin, an acrylic resin, a polyester resin, a polyamide resin, or a polyurethane resin, or a fiber bundle such as a felt. Alternatively, in the case where these fiber bundles are composed of resin-processed fiber cores, sintered cores, etc., they are deformed by heat treatment without impairing the characteristics (porosity, etc.) of the writing core 30, the shape and physical properties of the holding body 40. The heat treatment temperature range for forming the writing core 30 along the shape of the holding body 40 later, specifically, the melting temperature (melting point) of the writing core 30 and the holding body 40 is lower than the lower melting temperature (melting point), It is desirable to perform heat treatment in a temperature range in which the writing core 30 can be easily deformed, and it is particularly preferable that the lower melting at each melting temperature (melting point) of the writing core 30 and the holding body 40. Based on the degree (melting point), - (minus) 50 ° C. ~ - (minus) is preferable 10 ° C..
The specific heat treatment temperature and the like vary depending on the structure and material of the writing core 30 and the holding body 40. For example, the sintered core in which the writing core 30 shown in FIG. When the holding body 40 shown in FIG. 2 (b) is an acrylic resin (sintered body), the writing core 30 along the shape of the holding body 40 is formed by plastic working by heat treatment in the range of 110 to 180 ° C. As a result, the writing core 30 is tightly held (fixed) to the holding body 40 is obtained.
Specific heat treatment means can be performed by blowing hot air, passing through a heating furnace, heating by far infrared irradiation, or the like.

  In the present embodiment, the writing core 30 before deformation shown in FIG. 2A is deformed by plastic working, as shown in FIG. 2C and FIGS. 4A to 4F. The portion 32 has an inclined shape (knife cut shape), and the ink guide portions 31 and 31 are bent by insertion at the center portion, and the interval between the ink guide portions 31 and 31 is narrowly held on the rear end side (close contact). Fixed). Further, in the present embodiment, the writing core 30 has a structure that is securely fixed to the holding groove 46 of the holding body 40 by a structure such as plastic working and a holding groove. In the present embodiment, the front surface portion 47 of the holding groove 46 is firmly fixed without using an adhesive or the like by plastic working and insertion, and is a portion that contacts the writing portion 32 of the writing core 30. In addition, since the non-smooth surface portion 48 is formed of a concavo-convex step having a minute concavo-convex shape for preventing the deviation at the time of writing of the writing unit 32 and ensuring the close contact, the writing after the deformation is performed. The core 30 is securely fixed to the holding groove 46 of the holding body 40.

The width of the writing core 30 after being attached by plastic working is preferably 0.50 mm or more, particularly 1.00 to 3.00 mm, in order to ensure a sufficient writing flow rate. It is desirable to be.
In this embodiment, the writing part 32 after being attached by plastic working is inclined (knife cut) so that it is easy to write, and this inclination or the like is in accordance with the convenience of writing or the like. In this case, it can be adjusted by changing the shape of the holding body 40 as appropriate. The writing part 32 has a large drawn line width, preferably a drawn part having a drawn line width of 1 mm or more, and more preferably a drawn line width of 2 mm or more.

When the holder 40 [(FIG. 2 (c), FIG. 4 (a) to (f)]) to which the writing core 30 is fixed is inserted into the front shaft 15, the convex fitting portion 16 of the front shaft 15 is inserted. By fitting the concave fitting portion 41 a of the holding body 40, the writing core 30 is attached (fixed) to the writing instrument shaft body 10 via the holding body 40 and the ink guiding portions 31, 31 of the writing core 30. The rear side end portions 31a and 31a are configured to enter the inside of the front end side of the ink storage body 20 (FIG. 1A). A recess for inserting the rear side end portions 31a and 31a may be formed, and when the pressure in the shaft body 10 is increased, ink dripping may occur from the pen tip. In the writing instrument A, the inside and outside air of the shaft body 10 are adjusted via the air circulation grooves 41b and 41b. To have.
The cap 50 is detachably attached to the front end side outer peripheral surface of the front shaft 15 by fitting or the like. When the ink for the writing instrument is a thermochromic ink, it is preferable that a thermoplastic elastomer is formed on the outer surface of the cap 50 or the top of the cap 50 so as to easily generate frictional heat by a rubbing operation.

  In the writing instrument A according to the present invention, the ink occlusion body 20 that occludes the ink for the writing instrument is inserted and held in the rear shaft 11 that constitutes the shaft body 10 of the writing instrument, and the front shaft 15 and the writing core 30 before deformation as described above are retained. Are attached to the holding body 40 having the above-described configuration, and then the writing core 30 is deformed into the writing core 30 along the shape of the holding body 40 by plastic working (plastic processing), and the holding body 40 is fixed and held in order. The writing instrument A can be easily produced by fixing by fitting or the like, and the ink occluded in the ink occlusion body 20 is efficiently supplied to the writing part 32 of the writing core 30 by capillary force and used for writing. Will be.

In the writing instrument A configured as described above, the writing core 30 forms the writing core 30 along the shape of the holding body 40 by plastic working, and the holding body 40 in which the writing core 30 is held in close contact with the holding body 40 is ink-filled. A writing instrument can be easily obtained by attaching and adhering to the shaft body 10 of the writing instrument to which the occlusion body 20 and the tip shaft 15 are attached, and the writing core has a shape that has been previously determined to follow the shape of the holding body 40. Since it can be attached and fixed in a shape along the shape of the holding body 40 by plastic working without using a core, even if the mounting shape of the holding body is different, it can be manufactured with a single writing core 30. Productivity can be increased, the cost can be increased, and a writing instrument having a writing core of various shapes can be efficiently manufactured. Therefore, the writing instrument of the present invention can provide a writing instrument that can be manufactured at a low cost, with a simple structure, and with a manufacturing means that reliably secures the writing core to the holder, stabilizes the assembly process. Become.
Further, by making at least a part of the front surface portion 47 of the holding body 40 in contact with the writing core 30 into a non-smooth surface shape 48, the writing core 30 is securely fixed to the holding body 40 and the assembly process is performed. Stabilization can be achieved.

  In the writing instrument A of the present invention, as described above, since the holding body 40 to which the writing core 30 is fixed by plastic working is made of a material having visibility, the visible portion 43 of the holding body 40 is written. It will be the visual recognition part that can visually recognize the direction, and it will provide sufficient visibility to read the characters written in the writing direction with certainty and provide a writing instrument that can be used until the final writing. It becomes.

The writing instrument of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the technical idea of the present invention.
The technical idea of the present invention is a writing instrument in which a writing part is composed of at least a writing core made of a porous body and a holding body that holds the writing core, and the writing core uses the writing core before deformation as a holding body. Since the writing core is deformed by attachment and plastic working, and the writing core along the shape of the holding body is formed and held tightly, the writing core has the shape shown in FIG. Are not limited to those provided with the ink guiding portions 31 and 31 and the writing portion 32 for deriving the ink from the ink guiding portions 31 and 31, and the shape along the shape of the holder after deformation by plastic working A writing core having various shapes and sizes can be used before deformation.

  In the above embodiment, as the plastic working, heat exceeding the elastic deformation region is applied to the writing core 30 by heat treatment so that the characteristics of the writing core 30 and the holding body 40 are not impaired. However, by other plastic working (plastic treatment), for example, at least one of pressure treatment, pressing treatment, and tension treatment, or at least one of these and the above heat treatment. By suitably combining them, the writing core 30 is subjected to processing such as the above combinations exceeding the elastic deformation region, and the writing core 30 conforms to the shape of the holding body 40 without impairing the characteristics of the writing core 30 and the holding body 40. Thus, it may be fixed by close contact.

  Moreover, in the said embodiment, the non-smooth surface part 48 which becomes a non-smooth surface shape and becomes uneven | corrugated shape was formed in at least one part of the front surface part 47 of the holding body 40 which contacts the writing core 30 with the said plastic working. However, a part or all of the bottom surface of the holding groove 46 may have a non-smooth surface shape (including a satin shape) having an uneven shape.

Further, the configuration other than the writing core 30 and the holding body 40, which is the gist of the present invention, is not particularly limited, and various modifications can be made without departing from the technical idea of the present invention.
For example, in the above-described embodiment, a writing instrument of a method (batting type) in which the ink stored in the ink storage body 20 is efficiently supplied to the writing unit 32 of the writing core 30 by capillary force is shown, but directly in the ink tank. A direct liquid writing instrument containing ink or a writing instrument having a valve mechanism, for example, an ink chamber containing ink directly in a shaft body serving as a writing instrument body is provided, and a valve is provided between the ink chamber and the writing core. A writing instrument configured to supply ink to the writing core by providing a mechanism, retreating the valve rod against the urging force of the spring of the valve mechanism by pushing and moving in the direction of the pen tip, releasing the valve portion, and discharging ink It may be.

Furthermore, in the above-described embodiment, the writing core 30 as the pen tip is a single type writing tool. However, the twin type writing tool is provided with a pen body consisting of a thin-type writing core at the tip of the rear shaft to store the ink. It is good also as a structure which supplies the ink of the body 20 to the said pen body.
Furthermore, in the above-described embodiment, the ink for the writing instrument has been described. However, a liquid body such as a liquid cosmetic, a liquid medicine, a coating liquid, and a correction liquid is used, and the writing core is combined with the liquid body. A suitable application member having the same configuration may be used.

  Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples.

[Example 1]
A writing instrument and ink conforming to the following configuration and FIGS. 1 to 4 were used. The size of the writing core, the holding body, etc. was as shown below.

(Configuration of the writing core 30)
PE sintered core using polyethylene (PE) powder having an average particle size of 5 μm (melting point 130 ° C.), porosity 60%, writing part: upper side length 4 mm, lower side length 5 mm, height 2 mm, by plastic working Shape after mounting: knife cut, ink guiding part: φ (t) 2 mm, length 16 mm, upper side length 4 mm, lower side length 5 mm, height 2 mm
(Configuration of holding body 40)
Made of acrylic resin (melting point 160 ° C.), visible light transmittance 85% [manufactured by Suga Test Instruments Co., Ltd., multi-light source spectrocolorimeter (MSC-5N)]. ]
Size of visible part 43 (square) after writing core is attached: 5 mm × 6 mm × 3 mm × 4 mm
Non-smooth surface portion 48: wedge-shaped uneven shape: right triangle 1.2 × 0.6 × 2.0 mm: number 3, occupation ratio (in the entire surface portion 47a) 40%
Non-smooth surface portion 49: uneven shape: length 2.0 mm, uneven step: 0.1 mm, occupation ratio: entire surface portion 47b

(Configuration of writing tool members other than the writing core 30 and the holding body 40)
Ink occlusion body: PET fiber bundle, porosity 85%, φ6 × 77 mm
Writing instrument body, cap: made of polypropylene (PP)

(Ink composition)
As the ink, ink having the following composition (total 100% by mass) was used.
Moisturizer: Trimethylglycine (Glycine betaine) 7.5% by mass
Pentaerythritol 4.5% by mass
Colorant: NKW-4805 yellow (manufactured by Nippon Fluorescence) 40.0 mass%
Preservative: Bioace (Kai Kasei Co., Ltd.) 0.3% by mass
pH adjuster: Triethanolamine 1.0% by mass
Fluorosurfactant: Surflon 8111N (manufactured by AGC Seimi Chemical Co., Ltd.) 0.2% by mass
Water-soluble organic solvent: ethylene glycol 3.0% by mass
Water (solvent): ion-exchanged water 43.5% by mass

In the writing instrument of the first embodiment, first, the writing core 30 shown in FIG. 2A having the above-described configuration before deformation is attached to the holding body 40 shown in FIG. 2B [FIG. 2C], plastic working, Specifically, the writing core 30 is deformed by plastic processing at a heat treatment temperature of 120 ° C. with a pressing load of 5 N, and the writing core along the shape of the holding body 40 shown in FIGS. It was formed and held in close contact with the holder 40. After the writing core 30 was fixed to the holding body 40, it was mounted on the writing instrument shaft 10 via the tip shaft 15 to produce the writing instrument shown in FIG.
According to the writing instrument of Example 1, the writing core is attached and fixed in a shape that conforms to the shape of the holding body 40 by plastic working without being a writing core having a shape that is previously determined to follow the shape of the holding body 40. Therefore, even if the mounting shape of the holding body is different, it can be manufactured with one writing core 30, so that the productivity of the writing core 30 can be increased, and the writing cores of various shapes can be manufactured at low cost. It was confirmed that the provided writing instrument can be manufactured efficiently.
In addition, since at least a part of the surface portion 47 of the holding body 40 that comes into contact with the writing core 30 has a non-smooth surface shape, the writing core is securely fixed to the holding body with a simple structure without using an adhesive or the like. At the same time, it was possible to manufacture the assembly process at a low cost.
In addition, when writing on the character using the obtained writing instrument, when visually checking the appearance of the other side through the visible part at the time of writing, the visibility is sufficient, easy to see, in the writing direction I was able to write while reading the written letters.

  Furthermore, this writing instrument is set in an automatic writing device, and after drawing a straight line at a writing angle of 65 °, a writing load of 1 N, a speed of 7 cm / s and a distance of 100 m on a high-quality paper surface according to JIS S6037, the written drawing state is visually observed. As a result, it was found that even if the writing core 30 was fixed to the holding body 40 by plastic working, the writing property was good, there was no blurring of the drawn lines, and the ink flow rate was also good.

[Example 2]
In Example 1 described above, the shape and size of the writing part 30 were changed except that the structure of the writing core 30 was changed from a PE sintered core to a polypropylene sintered core (porosity 60%, melting point 160 ° C.). The writing instrument was manufactured without changing the configuration of the holding body 40, the ink occlusion body, the writing instrument body, the cap, and the ink composition.
Specifically, in the writing instrument of Example 2, first, the writing core 30 shown in FIG. 2A having the above-described configuration before deformation is attached to the holding body 40 shown in FIG. The plastic core is deformed by a plastic processing with a 5N pressure load at a heat treatment temperature of 150 ° C. to form a writing core along the shape of the holding body 40 shown in FIG. It was kept in close contact. After the writing core 30 was fixed to the holding body 40, it was mounted on the writing instrument shaft 10 via the tip shaft 15 to produce the writing instrument shown in FIG.
Even in the writing instrument of this Example 2, it was confirmed that even if the material of the writing core was changed and plastic processing was performed, the same effects as those of Example 1 could be exhibited.

  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 marker, or an aqueous marker.

A writing instrument 10 shaft body 11 rear shaft 15 front shaft 20 ink occlusion body 30 writing core 40 holding body 48 non-smooth surface shape (non-smooth surface portion)
50 cap

Claims (3)

  A writing instrument comprising a writing core comprising at least a writing core made of a porous body and a holding body for holding the writing core, wherein the writing core is attached to the holding body before being deformed, deformed, and the holding body A writing instrument, wherein a writing core along a shape is formed and held in close contact.   The writing core includes an ink guiding portion and a writing portion for deriving ink from the ink guiding portion, and a flat writing portion is formed into an inclined writing portion by deformation due to plastic processing. The writing instrument according to claim 1.   At least a writing core comprising a porous body, and a manufacturing method of a writing instrument comprising a writing unit comprising a holding body that holds the writing core, wherein the writing core is attached to the holding body before being deformed, A method for producing a writing instrument, comprising: producing a writing instrument in which the writing core is deformed into a writing core along a shape of a holding body by plastic working to be closely held.

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