JP2002234289A - Pen point for marking pen and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pen point of a marking pen, with which a stable writing is realized, a certain handwriting breadth is obtained and, in addition, the adhesion of ink to a ruler can be prevented from developing and a manufacturing cost is suppressed. SOLUTION: In the pen point 1 for the marking pen, a binder resin is adhered within a fiber bundle and solidified and, in addition, the binder resin is adhered to the outer peripheral part of the fiber bundle and solidified, resulting in forming a non-liquid penetrable outer skin 3. The pickup of the binder resin in the outer peripheral part of the fiber bundle is made much more than that in its interior.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a nib for a marking pen.

[0002]

2. Description of the Related Art Conventionally, as a pen tip for a marking pen of this type, for example, Japanese Patent No. 2,896,883 discloses a method in which a polyester synthetic fiber is bundled with a synthetic resin adhesive for the purpose of preventing ink from adhering to a ruler. (Corresponding to the binder resin of the present invention) is impregnated, dried, and solidified. The outer periphery of the knife-tip shaped pen tip portion is integrally covered with a thermoplastic synthetic resin together with the substrate portion. The thickness of the covering member (corresponding to the outer skin of the present invention) is set to 0.01 mm to 2.00 mm.

[0003] However, the above-mentioned conventional nib is formed by impregnating a fiber bundle with a synthetic resin-based adhesive and then molding the fiber bundle.
Since a separate molding step for covering the outer peripheral surface with a covering member made of a thermoplastic synthetic resin is required, the manufacturing cost increases, and it is difficult to provide it at low cost.

Further, the conventional nib has a weak adhesion between the inner fiber and the covering member, and the inner fiber and the covering member peel off at the time of writing. May be given.

Also, in Japanese Patent Publication No. 5-66279, a binder resin is adhered and solidified to the outer peripheral portion of a fiber bundle for the purpose of obtaining a fiber-made high void pen which satisfies soft writing feeling and durability. Thus, a pen tip having a configuration in which an annular outer skin portion (corresponding to the outer skin of the present invention) is formed and the inner fiber bundle is not substantially processed with resin is disclosed.

However, since the annular outer skin itself has a capillary gap, when drawing a line by applying the pen tip to the ruler, when the pen tip is brought into contact with the ruler, ink is attached to the ruler and the ruler is attached. There is a risk of soiling. In addition, the conventional nib has a fixed width because the width of the handwriting changes due to the writing pressure even if a soft writing feeling is obtained because the fiber bundle inside is not substantially resin-processed. It is not suitable as a nib for obtaining handwriting.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and eliminates the need for a separate molding step, can reduce the manufacturing cost, and firmly adheres the fiber and the outer cover. Accordingly, it is an object of the present invention to provide a nib for a marking pen, which enables stable writing, obtains a handwriting with a constant width, and can prevent ink from adhering to a ruler.

[0008]

Means for Solving the Problems [1] The nib 1 for a marking pen of the present invention is obtained by adhering and solidifying a binder resin inside a fiber bundle and adhering and solidifying the binder resin on an outer peripheral portion of the fiber bundle. The liquid-permeable outer skin 3 is formed, and the amount of the binder resin attached to the outer peripheral portion is set to be larger than the amount of the binder resin attached to the inner portion (claim 1).

(Function) By providing the liquid-impermeable outer skin 3 on the outer peripheral portion, when the outer peripheral surface of the pen tip is drawn on the ruler to draw a line, the ink inside the pen tip exudes to the outer peripheral surface of the pen tip. As a result, the ink does not adhere to the ruler, and the ruler is not contaminated with ink.

[0010] Further, by adhering and solidifying the binder resin to the fibers 2 inside, the pen tip does not fluctuate during writing, and a constant handwriting width can be obtained.

Further, since the outer cover 3 is formed by increasing the amount of the binder resin attached, a separate molding step for providing the outer cover 3 becomes unnecessary, and the manufacturing cost can be reduced.

Further, since the outer cover 3 is formed by the binder resin, the inner fibers 2 and the outer cover 3 at the outer peripheral portion can be sufficiently adhered to each other, so that there is no possibility of shaking during writing and a stable writing feeling can be obtained. In particular, by making the outer skin 3 non-liquid permeable, the strength of the outer skin 3 itself can be improved as compared with the case of liquid permeability.

[2] In the nib 1 for a marking pen of the first aspect, it is preferable that the amount of the binder resin attached is gradually increased from the inside toward the outer periphery (claim 2).

(Function) By the configuration in which the amount of binder resin attached gradually increases from the inside toward the outer periphery,
Since the amount of binder resin attached does not increase rapidly from the inside toward the outer periphery, and there is no clear boundary between the inner fiber 2 and the outer skin 3, the inner fiber 2 and the outer skin 3 are not present. Further increase the adhesion strength between the inner fibers 2
And the outer skin 3 can be prevented from peeling off.

[3] In the nib 1 for a marking pen according to the first or second aspect, the inner binder resin and the outer peripheral binder resin are preferably composed of the same main component (claim 3). .

(Function) By this, the adhesion strength between the inner fiber 2 and the outer skin 3 at the outer peripheral portion can be further increased, and peeling of the inner fiber 2 from the outer skin 3 can be prevented.

The binder resin of the inner fiber 2 and the binder resin of the outer skin 3 of the outer peripheral portion need only have the same main component, and may have different additives and coloring agents.

[4] In the marking pen nib 1 according to any one of claims 1 to 3, it is preferable that the outer cover 3 is made of a transparent binder resin (claim 4).

(Effect) Even if volatilization traces (bubbles) of the resin liquid solvent are generated on the surface of the outer cover 3, the outer cover 3 is transparent. Volatilization traces are not conspicuous and there is no risk of impairing the appearance. Note that having the transparency may be any of colorless and transparent, colored and transparent, and translucent.

[5] Further, in the method of manufacturing the pen tip 1 of the present invention, the entire fiber bundle is immersed in a binder resin solution having a low resin concentration, and dried or solidified.
The entirety of the fiber bundle is immersed in a binder resin solution having a high resin concentration and dried and solidified to form a non-liquid-permeable outer skin 3 made of a binder resin on the outer peripheral portion. Requirements.

(Function) Due to the above-mentioned manufacturing method (resin processing with a high-concentration resin liquid after resin processing with a low-concentration resin liquid), the high-concentration resin liquid hardly impregnates inside the fiber bundle. Therefore, it is possible to easily form the liquid-impermeable outer skin 3 made of the binder resin in which the amount of adhesion at the outer peripheral portion is larger than the amount of adhesion at the inner portion. Further, a separate molding step for forming the outer skin 3 is not required, and the manufacturing cost can be reduced. Furthermore, a strong adhesion between the inner fiber 2 and the outer skin 3 at the outer peripheral portion can be achieved, the separation of the inner fiber 2 and the outer skin 3 can be prevented, and there is no possibility of shaking at the time of writing, and a marking pen capable of writing stably. The pen tip 1 is obtained.

In addition, the above-mentioned manufacturing method is applicable to at least two kinds of resin processing (namely, resin processing by immersion in a resin liquid having a low binder resin concentration and resin processing by immersion in a resin liquid having a high binder resin concentration). For example, after the resin processing by immersion in the resin liquid having a high binder resin concentration, the resin processing can be further performed again by immersion in a resin liquid having a high binder resin concentration. The strength of 3 can be improved and the impermeable outer skin 3 can be reliably obtained.

In the above-mentioned manufacturing method, "drying"
In this state, the binder resin is in a non-solidified state. Further, “drying and solidification” in the above-mentioned manufacturing method refers to volatilization of the solvent component of the resin liquid and solidification of the binder resin. That is,
In the manufacturing method, the binder resin attached to the fiber bundle after being immersed in the low-concentration resin solution may be in a non-solidified state or a solidified state.

[6] In the method for manufacturing a pen tip for a marking pen according to the above [5], the resin liquid having a low resin concentration is in a range of 5% by weight to 35% by weight (preferably, 10% by weight). Wt% to 30 wt%), and the resin solution having a high resin concentration is in a range of 60 wt% to 90 wt% of solid content (preferably in a range of 65 wt% to 85 wt% of solid content). (Claim 6) is effective.

(Function) As a result, a sufficient ink-outflow property of the internal fibers 2 and a sufficient adhesive strength that does not disturb during writing can be obtained, and the non-liquid-permeable outer skin 3 made of a binder resin can be easily formed. Obtainable.

If the low-concentration resin liquid is less than 5% by weight of the solid content, the amount of resin adhering to the internal fibers 2 becomes insufficient, and the fibers at the tip of the pen tip may be dislodged during writing. is there. Conversely, if the low-concentration resin liquid is larger than 35% by weight of the solid content, the amount of resin adhering to the fibers 2 inside becomes excessive, and there is a possibility that smooth ink outflow inside the pen tip may be impaired. .

If the high-concentration resin liquid is smaller than 60% by weight of the solid content, the non-liquid-permeable outer skin 3
Is difficult to obtain, and at the time of writing, the ruler may be stained by ink oozing from the inside of the pen tip to the surface of the outer cover 3. Conversely, if the high-concentration resin liquid is greater than 90% by weight of the solid content, the fluidity of the resin liquid is reduced, and it is difficult to adhere the resin uniformly to the entire outer peripheral portion of the fiber bundle in terms of manufacturing. Become.

The binder resin of the present invention (claims 1 to 6) is preferably a thermosetting resin, and can be diluted with a solvent to obtain a resin liquid. The thermosetting resin includes, for example, polyurethane resin, phenol resin, epoxy resin, melamine resin, polyester resin, urea resin, xylene resin, diallyl phthalate resin, phthalic acid resin, furan resin, aniline resin, butene resin, and the like. Can be

[0029]

Embodiments of the present invention will be described with reference to the drawings.

(Construction) FIGS. 1 and 2 show an embodiment of the marking pen nib 1 of the present invention. The pen nib 1 for a marking pen of the present embodiment has a binder resin (for example, polyurethane having transparency) made of a thermosetting resin having transparency by resin processing inside a fiber bundle of synthetic fibers (for example, polyester fiber). (Resin) is adhered and solidified, and the thermosetting resin having transparency, which is larger than the resin adhering amount inside the fiber bundle, is adhered and solidified on the outer peripheral portion of the fiber bundle to form the outer cover 3.

The front end of the marking pen nib 1 has a shape in which the front end face is obliquely cut and the opposing side face is cut in a chisel shape. Further, the rear part of the pen tip 1 for the marking pen is reduced in diameter, and a step part 4 is provided between the front part and the step part.
Is formed.

As shown in FIG. 2, the amount of the binder resin (polyurethane resin) is gradually increased from the inside toward the outer periphery. Thereby, a capillary gap for drawing out ink is formed inside the marking pen nib 1 (that is, the fiber 2 inside), and non-permeate liquid flows through the outer periphery of the marking pen nib 1. A circular outer skin 3 is formed.

The synthetic fiber is not limited to polyester fiber but may be polyamide, polyolefin, acrylic,
Fibers such as polyvinyl alcohol and polyvinyl chloride are exemplified.

(Manufacturing Method) Next, a method of manufacturing the pen tip 1 for the marking pen will be described. A sliver-shaped bundle of polyester fibers (single fiber fineness: 3 denier) is used for approximately 24
It is passed through a forming die (pore diameter 4 mm) heated to 0 ° C. to form an outer shape, and the obtained outer shape is a low-concentration polyurethane resin liquid having a solid content concentration of 20% by weight (tolylene diisocyanate which forms polyurethane by a condensation reaction. A solution obtained by adding ethyl acetate as a diluting solvent to a mixture of polyols)
To impregnate the entire fiber bundle with the low-concentration resin solution, pass it through a heat-dried BOX (1 m in total length, temperature: 80 ° C.) to volatilize the solvent, and adhere the polyurethane resin to the entire fiber bundle. . In this state, the polyurethane resin is in a non-solidified state (a viscous state).

Next, the fiber bundle is mixed with a high-concentration polyurethane resin solution having a solid content of 70% by weight (a mixed solution of tolylene diisocyanate and polyol which forms polyurethane by condensation reaction), and ethyl acetate as a diluting solvent. After the fiber bundle is impregnated with the high-concentration resin solution, the fiber bundle is heated and dried in a BOX (total length 1 m, temperature 16).
(0 ° C. to 170 ° C.), thereby evaporating the solvent component and curing (that is, solidifying) the polyurethane resin attached to the entire fiber bundle. Thereby, the polyurethane resin can be appropriately adhered and solidified inside the fiber bundle, and the liquid-impermeable outer skin 3 made of the polyurethane resin can be formed on the outer periphery of the fiber bundle.

In the above-mentioned step, the fiber bundle is continuously taken off at a speed of 30 cm / min by a take-off machine, thereby obtaining a continuous rod-shaped formed body (so-called original rod) having an outer skin 3 on the outer peripheral portion. Thereafter, the continuous rod-shaped compact is cut into appropriate lengths, and the front end and the rear are ground to obtain the nib 1 having the above shape (FIGS. 1 and 2).

[0037]

According to the present invention, the manufacturing cost can be reduced by eliminating the need for a separate molding step, the fiber and the outer skin can be firmly adhered to each other, and stable writing can be performed, and a handwriting with a constant width can be obtained. Further, it is possible to prevent ink from adhering to the ruler.

According to the second aspect, the adhesion strength between the inner fiber and the outer skin at the outer peripheral portion can be further increased, and the separation between the inner fiber and the outer skin can be prevented.

According to the third aspect, the adhesion strength between the inner fiber and the outer skin at the outer peripheral portion can be further increased, and the separation between the inner fiber and the outer skin can be prevented.

According to the fourth aspect, even if traces of volatilization of the resin liquid solvent are generated on the surface of the outer cover, the traces of volatilization are inconspicuous.
There is no risk of spoiling the appearance.

According to the fifth aspect, it is possible to easily form a liquid-impermeable outer skin made of a binder resin in which the amount of adhesion on the outer peripheral portion is larger than the amount of adhesion on the inner portion. Further, a separate molding step for forming the outer skin is not required, and the manufacturing cost can be reduced. In addition, strong adhesion between the inner fiber and the outer skin is possible, preventing peeling of the inner fiber and the outer skin. can get.

According to the sixth aspect of the invention, it is possible to obtain a sufficient ink-outflow property of the internal fibers and a sufficient adhesive strength without rash during writing, and to easily obtain a non-liquid-permeable outer skin made of a binder resin. .

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Marking pen nib 2 Inner fiber 3 Outer skin 4 Step

Claims (6)

[Claims] 1. A binder resin is adhered and solidified inside a fiber bundle, and a binder resin is adhered and solidified on an outer peripheral portion of the fiber bundle to form a liquid-impermeable outer skin. A pen nib for a marking pen, wherein the amount is larger than the amount of the binder resin in the inside. 2. The nib for a marking pen according to claim 1, wherein the amount of the binder resin adhered is gradually increased from the inside toward the outer periphery. 3. The binder resin in the inner part and the binder resin in the outer peripheral part are mainly composed of the same resin.
The nib for the described marking pen. 4. The nib for a marking pen according to claim 1, wherein said outer skin is made of a binder resin having transparency. 5. An entire fiber bundle is immersed in a binder resin liquid having a low resin concentration and dried or dried and solidified. Then, the entire fiber bundle is immersed in a binder resin liquid having a high resin concentration and dried and solidified. A method for manufacturing a pen nib for a marking pen, wherein a liquid impervious outer skin made of a binder resin is formed on the outer peripheral portion. 6. The resin liquid having a low resin concentration has a solid content of 5% by weight to 35% by weight, and the resin liquid having a high resin concentration has a solids concentration of 60% to 90% by weight. The method for producing a nib for a marking pen according to claim 5, wherein