JP6126828B2 - Writing instrument - Google Patents

Description

  The present invention relates to a writing instrument suitable for a ballpoint pen, a marking pen, or the like that controls the flow pressure of ink applied to a pen tip to a constant pressure to prevent a direct current ink phenomenon and a backflow phenomenon.

  In general, a writing instrument in the form of a follower (tracking body) filled with ink in a writing instrument main body such as an ink container, which is excellent in display properties and easy to understand the remaining amount of ink, is used for direct current of ink. In order to prevent this, many structures having a ballpoint pen tip or a valve system that can move minutely are employed.

Writing instrument using the ball-point pen tip as the former is prevented direct ink, ink as has ink difficulty to direct the chip even when kept in contact with the non-writing surface facing downward tip by storage or the like In many cases, the width of the ink design is narrowed.
In addition, the valve-type writing instrument adopted in the latter is not good at writing because of the backlash at the time of writing, and the ink flow rate changes depending on the time the valve is open. There was a problem that the difference was easy to make.

As a writing instrument that tries to solve such a problem, for example,
1) A writing instrument that can smoothly open the valve-type writing instrument without causing an uncomfortable feeling such as a pumping sensation, and that has sufficient spring force to close the valve and can reliably prevent ink leakage and fluttering. The valve is opened when the pen core is moved backward by a certain stroke or more and a pressing force exceeding a specific resistance load is applied, and the ink in the ink container is circulated toward the pen core. A valve-type writing instrument having a mechanism, and a dummy pumping portion made of an elastic member that increases a resistance load against the pressing of the pen core in accordance with the backward movement of the pen core during the stroke until the valve opens. A writing instrument having a structure provided at the tip of the shaft cylinder (for example, see Patent Document 1),
2) An air circulation means for storing liquid in the interior and connected to ejection means for ejecting the liquid, and taking in air corresponding to the volume of the content liquid consumed as the content liquid is consumed through the ejection means. In the liquid storage container of the provided liquid ejection tool, an air exchange wall made of organopolysiloxane that is solid at room temperature is disposed as the air circulation means, and the minimum distance required for communication between the inside and outside of the container is 1.0 μm or more and 0 A liquid storage container for a liquid ejection tool characterized in that it is 2 mm or less (for example, see Patent Document 2),

3) Forming an air flow passage for taking in outside air to maintain the pressure inside the ink tank according to the change in the volume of the ink in the ink tank as the ink is consumed. In the writing instrument, a viscous fluid having a contact angle θ with a wall member in contact with the air flow passage of 0 <θ ≦ 90 ° and a surface tension α of 10 dyn / cm ≦ α ≦ 73 dyn / cm (20 ° C.). The writing fluid is characterized in that an air flow hole is temporarily formed in the viscous fluid layer with a decrease in the ink tank internal pressure associated with the volume change of the ink (see, for example, Patent Document 3) ),
4) A space of a required cross-sectional area that circulates to the outside via an air exchange means is secured between the inner cylinder in which the ink is fluidly stored directly and the rear end is opened, and the inner cylinder. The inner cylinder is provided in a coaxial loose fit and the rear end is closed, and a pen tip provided at the front end opening of the outer cylinder and the inner cylinder, A balance liquid that controls the fluid pressure of the ink applied to the pen tip to a constant pressure is fluidized on the rear side of the space in the outer cylinder that communicates through the rear end opening of the inner cylinder space in a state of being connected from the interface. A writing instrument (see, for example, Patent Document 4),
5) A writing instrument in which ink stored in a raw ink state in an ink storage chamber is supplied to the pen tip, and the wall that forms the ink storage chamber is configured so that the volume of the ink storage chamber decreases as the ink is consumed. An air chamber having a movable wall portion having the movable wall portion in a partition wall portion with the ink storage chamber and an elastic wall portion and a liquid film forming wall portion by capillary force in the partition wall portion with the outside. A writing instrument (see, for example, Patent Document 5) characterized by providing

Each of the writing instruments described in Patent Documents 1 to 5 is improved from the conventional structure, and its performance is improved. However, since the ink direct current phenomenon is still observed, it is insufficient. .
Moreover, in the said patent document 5 which discloses the proximity | contact technique of this invention, although the elastic film body for internal pressure change correspondence is provided, when there is no reaction force (returning force) in this elastic body, it is based on permeation | transmission. If the pressurization cannot be suppressed and the external air pressure becomes lower than the atmospheric pressure, the internal pressure becomes a pressurized state, and even if the decrease in the external air pressure is within the atmospheric pressure, it is heated thereafter. And the internal pressure will be in a pressurized state, and further, if a reaction force is applied to the elastic film body, if the volume increases due to temperature change, the reaction force will be in a pressurized state, In the elastic film body, the internal pressure change is not yet sufficiently coped with.

JP 2008-265203 A (Claims, drawings, etc.) JP 2001-96969 A (Claims, drawings, etc.) JP 2001-10280 A (Claims, drawings, etc.) Japanese Patent Laid-Open No. 11-99790 (Claims, drawings, etc.) JP-A-7-195891 (Claims, drawings, etc.)

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and is intended to solve this problem. A ballpoint pen and a marking that prevent the ink direct current phenomenon and the backflow phenomenon by controlling the flow pressure of the ink applied to the pen tip to a constant pressure. An object is to provide a writing instrument suitable for a pen or the like.

  As a result of diligent investigations to solve the above-described conventional problems, the present inventors have mounted a pen tip on the front part of the ink tank and filled the ink in the ink tank with a follower on the rear part of the ink. In such a state, a porous body having a specific structure is arranged in the space between the rear part of the follower and the rear end part of the ink tank, and the pen is sealed when the cap is applied. As a result, the present invention has been completed.

That is, the present invention resides in the following (1) to (3).
(1) A space between the rear part of the follower and the rear end part of the ink tank in a state where the pen tip is attached to the front part of the ink tank and the ink stored in the ink tank is filled with the follower. A writing instrument characterized in that a capillary porous body imparted with a capillary force by impregnating with a liquid is disposed, and the pen tip is sealed when capped.
(2) The writing instrument as described in (1) above, wherein the capillary force applied to the pen tip side is greater than the sum of the weight of the ink and the capillary force at the rear of the writing instrument.
(3) The writing instrument as described in (1) or (2) above, wherein the capillary porous body is in contact with a member having a slit portion.

  ADVANTAGE OF THE INVENTION According to this invention, the writing implement suitable for the ball-point pen, marking pen, etc. which controlled the flow pressure of the ink applied to a pen point to fixed pressure, and prevented the direct current ink phenomenon and the backflow phenomenon is provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is drawing of the writing instrument which shows an example of embodiment of this invention, (a) is a longitudinal cross-sectional view, (b) is a top view, (c) is the partial expanded longitudinal cross-sectional view which shows the principal part. It is a longitudinal cross-sectional view which shows the state which attached the cap body and sealed the nib. It is drawing of the writing instrument which shows the other examples of embodiment of this invention, (a) is a longitudinal cross-sectional view, (b) is a top view, (c) is the partial expanded longitudinal cross-sectional view which shows the principal part. It is drawing of the writing instrument which shows the other examples of embodiment of this invention, (a) is a longitudinal cross-sectional view, (b) is a top view, (c) is the partial expanded longitudinal cross-sectional view which shows the principal part. It is drawing of the writing instrument which shows the other examples of embodiment of this invention, (a) is a longitudinal cross-sectional view, (b) is a top view, (c) is the partial expanded longitudinal cross-sectional view which shows the principal part. It is drawing of the writing instrument which shows the other examples of embodiment of this invention, (a) is a longitudinal cross-sectional view, (b) is a longitudinal cross-sectional view which shows the state which attached the cap body and sealed the nib. It is drawing of the writing instrument which shows the other examples of embodiment of this invention, (a) is a longitudinal cross-sectional view, (b) is a longitudinal cross-sectional view which shows the state which attached the cap body and sealed the nib.

Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG.1 and FIG.2 is each drawing of the writing instrument which shows an example (1st Embodiment) of embodiment of this invention.
The writing instrument A of the present embodiment is a marking pen type writing instrument, and as shown in FIGS. 1 and 2, an ink tank 10 serving as a writing instrument main body (shaft), and a pen attached to the front portion of the ink tank 10 The tip 20, the ink 25 contained in the ink tank 10, the follower (following body) 30 filled in the rear part of the ink 25, and the rear part of the follower 30 in a state where the follower (following body) 30 is filled. It has the capillary porous body 40 which provided the capillary force arrange | positioned in the space part 12 with the rear-end part of the ink tank 10, and the cap body 50 which seals the nib 20 whole.

The ink tank 10 is preferably one that is not adversely affected by the raw material contained in the ink to be stored over time. For example, polypropylene (PP), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyethylene (PE ) Or a metal such as aluminum or the like, or a non-visible material. In the present embodiment, the ink tank 10 is formed into a cylindrical shape using polypropylene (PP) and functions as a writing instrument body.
The thickness (thickness) of the ink tank to be obtained varies depending on the type of ink to be stored, the type of material such as resin used, the type of writing instrument, etc., but preferably the strength, solvent permeability, moisture absorption suppression, moldability, design From the viewpoint of properties, it is preferably 0.05 to 2.0 mm, more preferably 0.3 to 1.5 mm.

The pen nib 20 is a pen core that serves as a writing part composed of a fiber core obtained by processing fiber bundles or resin processing these fiber bundles, or a sintered core (porous body) obtained by sintering various plastic powders. In this structure, the ink tank 10 is fixed to the through hole 15a of the front shaft 15 attached to the tip of the ink tank 10. The rear end side of the front shaft 15 is a fixing portion 15b that is fixed to the front end opening portion 10a of the ink tank 10 by fitting or the like.
In the present embodiment, the pen core 20 serving as a pen tip is configured by a fiber bundle core made of polyethylene terephthalate (PET) fibers.

The ink 25 stored in the ink tank 10 is not particularly limited, such as water-based ink, oil-based ink, and gel ink. The ink composition to be used includes pigments (including resin pigments), coloring agents such as dyes, main solvents, resins, and additives depending on the application (water-based ink, oil-based ink, gel ink, etc.) and writing instrument type (marking pen, ballpoint pen, etc.) Arbitrary components contained in the ink for a sticky agent and a writing instrument can be used.
As optional components, for example, rust preventives, antifungal agents, surfactants, lubricants, wetting agents and the like that can be compatible without adversely affecting the ink can be contained. In ballpoint pen inks, fatty acids and the like can be suitably used as lubricants. Further, as a drying inhibiting additive, a non-volatile solvent that is compatible with the main solvent may be contained within a range that does not adversely affect the product characteristics.
In the present embodiment, the ink is composed of water-based sign pen ink.

The follower (follower) 30 follows as the ink is consumed during writing, and preferably has low permeability and low diffusibility with respect to the solvent used in the ink. sparingly volatile fluid, in particular, can be used etc. polybutene or fluidized paraffin.
When the viscosity of these substances is low, it is preferable to use a thickener or a gelling agent. Specific examples include metal soaps, bentonites, fatty acid amides, hydrogenated castor oil, metal fine particles containing titanium oxide, silica, alumina and the like, celluloses, elastomers, and the like. In the present embodiment, the follower (follower) 30 is composed of mineral oil and a thickener.

  In this writing instrument A, a space portion 12 is formed between the rear portion of the follower 30 and the rear end side of the ink tank 10 in a state where the follower (following body) 30 is filled, and capillary force is applied to the space portion 12. The applied capillary porous body 40 is arranged. Specifically, a member 35 serving as a tail plug for sealing the opening 10 b is attached to the rear end opening 10 b of the ink tank 10. The member 35 includes a lid portion 35a, a through hole 35b formed in the center portion, slit portions 35c, 35c... Formed in the peripheral surface of the through hole 35b, and a capillary porous body 40 on the tip side of the through hole 35b. A capillary porous body 40 that is composed of a step portion 35d that holds the front end portion and a rib portion 35e and that imparts a capillary force to the through hole 35b having the slit portion 35c. The capillary porous body 40 to which force is applied is arranged.

The capillary porous body 40 is not particularly limited as long as it is composed of a porous body to which a capillary force is applied. For example, a fiber bundle such as a fiber bundle, a sintered body, or a felt is processed or these fiber bundles are processed. Examples thereof include a porous body selected from a fiber core obtained by processing a resin, a foamed material such as sponge, and a core containing a liquid such as mineral oil, process oil, silicon oil, or ionic liquid.
In view of preventing volatilization, it is preferable to use a process oil having a low vapor pressure.
This capillary porous body 40 takes in air when the ink is discharged from the pen tip 20, so that writing is possible, and when writing is stopped, the reduced pressure state in the space 12 can be maintained. This will prevent direct current from flowing. Further, the slit portions 35c, 35c,... Formed on the peripheral surface of the through hole 35b of the member 35 are temporarily held by the slit portions 35c, 35c, even if the oil in the porous body moves when taking in air. Liquid dripping can be prevented.
In this embodiment, it is comprised from the combination of a fiber bundle core and process oil.

  The cap body 50 includes a main body 51 that is detachably mounted on the front end side of the ink tank 10 that serves as a writing instrument main body (shaft), a nitrile rubber (NBR) that seals the entire protruding portion of the pen tip 20, and butyl rubber. And an inner cylinder portion 53 to which a seal member 52 made of rubber such as (IIR), thermoplastic elastomer, soft resin or the like is attached. By mounting the cap body 50 on the front end side of the ink tank 10, the entire portion of the pen core 20 protruding from the front shaft 15 is sealed by the seal member 52, and the pen tip 20 changes when the internal pressure of the ink tank changes. This prevents the direct current phenomenon from The seal member of this embodiment is made of butyl rubber (IIR).

In the present embodiment, in order to allow upward writing, the capillary force (M1) applied to the pen tip 20 side is set to be larger than the sum of the weight of the ink (M2) and the capillary force (M3) at the rear of the writing instrument. [M1> (M2 + M3)] is set. By this M1> (M2 + M3), upward can proof abolish Rukoto air from contamination from the pen tip even when writing, it is possible to prevent backflow of ink when the upward writing.

  In the writing instrument A of the first embodiment configured as described above, the space portion 12 is provided in the upper portion of the follower 30 and the capillary porous body 40 is provided in the upper portion of the space portion 12. As a result, the space 12 between the follower 30 and the capillary porous body 40 is in a reduced pressure state, and when the reduced pressure exceeds the capillary force of the capillary porous body 40, air (bubbles) enters the capillary porous body 40, and writing is performed as usual. Is possible. On the other hand, when the writing is finished, the bubbles generated above break, the liquid penetrates into the capillary porous body 40, the capillary force is restored, and the weight of the ink can be supported. By such a cycle, the writing pressure suitable for the marking pen that prevents the ink direct current phenomenon and the backflow phenomenon can be obtained by controlling the flow pressure of the ink applied to the pen tip to a constant pressure. Further, in the writing instrument A of the first embodiment, when the cap body 50 is mounted, the entire protruding portion of the pen core 20 is sealed by the seal member 52, so that even when the internal pressure changes such as heating of the ink tank, etc. This prevents the direct current phenomenon from the pen tip 20 during storage.

  Next, FIG. 3 to FIG. 7 show other examples of the writing instrument of the present invention (second embodiment to sixth embodiment), compared with the first embodiment of FIG. 1 and FIG. 3-5 are each structure which changed the arrangement structure of the capillary porous body 40 which provided capillary force, FIGS. 6-7 is each structure which changed the structure of the nib, and these each structure Except for the above, the second embodiment is the same as the first embodiment (FIGS. 1 and 2). In addition, in each writing instrument of FIGS. 3-5, since the cap body 50 which seals the whole protrusion part of the nib 20 is the same as that of the said 1st Embodiment, the illustration is abbreviate | omitted.

The writing instrument B according to the second embodiment of FIG. 3 is the same as the writing instrument A of the first embodiment described above, without the capillary porous body 40 to which the capillary force is applied being provided via the rib portion 35e provided on the distal end side of the through hole 35b. , Which is an arranged structure.
The writing instrument C according to the third embodiment shown in FIG. 4 is a capillary having a capillary force applied to the writing instrument A according to the first embodiment without using the step portion 35d and the rib portion 35e formed on the tip side of the through hole 35b. Capillary that is provided with a capillary force so that the porous body 40 is held by a convex holding portion 35f formed on the peripheral surface in the middle of the through-hole 35b, and is held by fitting to the convex holding portion 35f. The porous body 40 is also provided with a concave holding portion 41, and the capillary porous body 40 is arranged in the through hole 35b.
The writing instrument D which becomes 4th Embodiment of FIG. 5 is the writing instrument A of the said 1st Embodiment, without forming the slit parts 35c, 35c ... and the rib part 35e of the front end side which were formed in the surrounding surface of the through-hole 35b. The capillary porous body 40 to which the capillary force is applied is held by the step portion 35d, and the capillary porous body 40 is disposed in the through hole 35b.

  In each of the writing tools B to D of the second to fourth embodiments shown in FIGS. 3 to 5, as with the writing tool A of the first embodiment described above, the ink follower 30 and the follower 30 are used during ink writing. When the space 12 between the capillary porous bodies 40 is in a reduced pressure state and the reduced pressure becomes equal to or greater than the capillary force of the capillary porous body 40, the capillary porous body 40 is cut and air is mixed in, so that writing can be performed as usual, When the writing is finished, the liquid permeates into the capillary porous body 40 again, the capillary force is restored, and the weight of the liquid can be supported. Therefore, the ink flow pressure applied to the pen tip is controlled to a constant pressure, and the ink DC A writing instrument suitable for a marking pen that prevents the phenomenon / backflow phenomenon is obtained.

  The writing instrument E according to the fifth embodiment of FIG. 6 is different from the writing instrument A of the first embodiment described above in that the pen tip (pen core) 20 is composed of a fiber core, a sintered core (porous body), or the like. The writing instrument of the first embodiment described above is different only in that it is composed of a plastic core in which ink grooves are formed in the axial direction of various plastic materials via a relay core 16 provided in the fixing portion 15b of the shaft 15. Similarly to A, the writing pressure in which the pen tip composed of a plastic core is obtained by controlling the flow pressure of the ink applied to the pen tip to a constant pressure and preventing the ink direct current phenomenon and the backflow phenomenon.

  The writing instrument F according to the sixth embodiment of FIG. 7 is different from the writing instrument A of the first embodiment described above in that the tip (pen core) 20 is composed of a fiber core, a sintered core (porous body), or the like. It differs only in that it is composed of a ballpoint pen tip containing a writing ball via a relay core 16 provided in the fixing portion 15b of the shaft 15, and like the writing instrument A of the first embodiment described above, It is possible to obtain a writing instrument composed of a ball penc that prevents the ink direct current phenomenon / backflow phenomenon by controlling the flow pressure of the applied ink to a constant pressure.

  The present invention is not limited to the above-described embodiment, and can be modified into various forms without departing from the gist of the present invention.

  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: Marking pen, based on FIGS. 1 and 2]
(Configuration of the writing instrument body 10 and the tip 15)
Writing instrument body (ink tank), tip shaft configuration: PP writing instrument body (ink tank): wall thickness (thickness) 0.7 mm, length 100 mm, diameter 5.5 mm
(Configuration of the nib 20)
Writing part pen core: PE sintered core, porosity 60%, length 8 mm, diameter 3 mm
(Configuration of member 35)
Member (tail plug): made of PP, through hole: diameter 3 mm, slit hole: 3.3 mm, length 5 mm
(Configuration of the capillary porous body 40)
Capillary porous body: Acrylic fiber bundle core, porosity 60%, length 5mm, diameter 3mm
Liquid: Matsumura Oil Co., Ltd .: Barrel Process Oil P-26
(Configuration of the cap body 50)
Body: Polypropylene, Seal member: Butyl rubber

(Composition of ink 25 and follower 30)
As the ink, fluorescent peach ink having the following composition was used.
Color material: VC toner peach (manufactured by Mikuni Dye Co., Ltd.) 30 parts by weight Wetting agent: Glycerin 25 parts by weight Preservative: Bioace (manufactured by KAI Kasei Co., Ltd.) 0.7 part by weight Ion-exchanged water 44.3 parts by weight The composition was blended and heated for 1 hour to obtain a follower.
Mineral oil (PW-90: Idemitsu Kosan Co., Ltd.) 95 parts by weight Thickener (TPO5: Nihon Plus Kogyo Co., Ltd.) 5 parts by weight

  Using the marking pen-type writing instrument of Example 1 configured in this way, writing can be performed as usual, and even when writing is finished, there is no direct current of ink and the ink is applied to the pen tip. It was found that a marking pen can be obtained in which the ink flow pressure can be controlled to a constant pressure and the ink direct current phenomenon / backflow phenomenon is prevented.

[Example 2: Ballpoint pen, based on FIG. 7]
(Configuration of writing instrument member different from that of Example 1)
Configurations other than the following relay core, nib, and ink (writing instrument main body, tip shaft, member, capillary porous body, cap body, follower) are the same as those in the first embodiment.
Relay core: PET fiber bundle, porosity 60%, φ5 × 5mm
Nib (ballpoint pen tip): Stainless steel tip (hard metal ball, ball diameter 0.5 mm)
As the ink, a ballpoint pen ink (100 parts by mass in total) having the following composition was used.
Colorant: Carbon black 8.0 parts by weight Dispersant: 3.0 parts by weight of styrene maleic acid resin ammonium salt Lubricant: 0.5 parts by weight of potassium soap Liquid medium: 20.0 parts by weight of propylene glycol Preservatives: 1, 2 -Benzisothiazolone salt 0.3 parts by weight pH adjuster: 0.3 parts by weight of aminomethylpropanol Rust preventive agent: 0.2 parts by weight of benzotriazole Viscosity adjuster: 0.4 parts by weight of cross-linked acrylic polymer The rest Using the ballpoint pen-type writing instrument of Example 2 configured as described above, writing can be performed as usual, and there is no direct current of ink even when writing is completed. It has been found that a ballpoint pen can be obtained in which the applied ink flow pressure can be controlled to a constant pressure and the direct current ink phenomenon and the backflow phenomenon are prevented.

  The writing instrument of the present invention can be suitably used for marking pens such as ballpoint pens, underline pens, oil-based markers, and water-based markers.

A Writing instrument 10 Writing instrument body (ink tank)
15 Lead axis 20 Nib 25 Ink 30 Follower
40 Capillary porous body 50 Cap body

Claims (2)

A pen tip is attached to the front of the ink tank, and the ink stored in the ink tank and the back of the ink are filled with the follower, the liquid is applied to the space between the rear of the follower and the rear end of the ink tank. The capillary porous body to which the capillary force is imparted by impregnating is disposed, and when the cap is capped, the pen tip is sealed , and the capillary force applied to the pen tip side is determined by the weight of the ink and the capillary force at the rear of the writing instrument. Writing instrument characterized by being larger than the sum . A pen tip is attached to the front of the ink tank, and the ink stored in the ink tank and the back of the ink are filled with the follower, the liquid is applied to the space between the rear of the follower and the rear end of the ink tank. A writing instrument characterized in that a capillary porous body imparted with capillary force by being impregnated is disposed, and when the cap is capped, the pen tip is sealed , and the capillary porous body is in contact with a member having a slit portion. .

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