JP4465579B2 - Nib material, multicolor writing instrument using the same, and method for manufacturing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention is a felt-tip pen, a marking pen, further methods nib materials and their preparation for use as applicator of cosmetic and Ru der those multicolor writing instrument and its manufacturing method using this nib material.
More specifically, in a multicolor writing instrument having a nib, the present invention relates to a nib that enables multicolor writing with a single pen and a method for manufacturing the same, and belongs to the writing instrument manufacturing technology.
[0002]
[Prior art]
Various proposals have been made for multi-color writing instruments that allow multi-color writing with a single pen without changing the nib. Specific examples include the following.
1) Cover the outer periphery of the fiber pen body with a resin film, arrange even numbers and join them at the outer periphery to form a pen tip, and cut the tip covering portion diagonally to expose the outer periphery of each fiber pen body. A color marking pen (see Patent Document 1).
2) At least two pen tips whose surface does not permeate ink but whose inside is liquid permeable are attached to the pen shaft, an ink reservoir is connected to the rear end of each pen tip, and the tip of the pen tip is attached. A multicolor ink pen having a convex curved surface (see Patent Document 2).
[0003]
In addition, the following proposals have also been made regarding the nibs used in these multicolor writing instruments.
3) a plurality of independent spaces separated by the partition wall member in the outer member, the nib having a transverse cross-sectional shape of the structure integrally has a felt-like brush tip member in a binder shaped respectively (see Patent Document 3) .
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 49-32171 (Scope of claims for utility model registration)
[Patent Document 2]
JP-A-3-227699 (Claims)
[Patent Document 3]
JP-A-10-166778 (Claims)
[0005]
[Problems to be solved by the invention]
Writing instrument using such pen or nib, if writing while applying the pen tip on paper by tilting the nib, Ru can written by the connected ink nib.
Also, if you change the orientation of the pen axis by rotating the pen shaft and changing the part of the pen tip that contacts the paper surface, the color of the connected ink will change, so you can easily change the color of the writing, and arbitrarily change the color It can be used properly and is useful.
[0006]
However, as is clear from Patent Document 1, these known writing instruments are either coated with a resin film on the outer periphery of a thin fiber nib and then lined up evenly in the outer periphery, or as in Patent Document 2 In addition, the surface does not permeate ink, but the inside is prepared by closely fitting a plurality of pen pens having liquid permeability into a tubular object with their tip portions in close contact with each other .
Further, as a nib used in such a writing instrument, for example, a plurality of felt-shaped nib members formed in a predetermined cross-sectional shape are passed through an extrusion molding die to coat and form the partition wall member and the outer member. What is prepared by a method is mentioned (refer patent document 3).
[0007]
As described above, the method of covering the outer periphery of the fine fiber pen body with the resin film requires fine operations and processes including those by extrusion molding as described above .
Further, for the preparation of multi-color writing instrument not only requires a troublesome work to combine multiple fine nib, production cost to be Ru der those problematic.
For this reason, there is a strong demand for a nib that does not require a nib coupling (bundling) in a simple method for preparing a nib for a multicolor writing instrument, and also in the preparation of a writing instrument.
[0008]
In view of such a current situation, the inventors have adopted a method of manufacturing a nib made of a fiber bundle, in order to solve the above problems, impregnating a bundled fiber bundle with a resin solution, and then heating Then, a rod-shaped pen core obtained by removing the solvent was cut to examine whether a conventional method using a pen tip could be applied.
[0009]
As a result, the surface of the fiber bundle prepared by the above method is melted with the thermoplastic fibers constituting the bundling body to form an ink-impermeable thermoplastic resin layer, so that the surface does not transmit ink. It was found that a nib made of a fiber bundle having liquid permeability was obtained inside.
[0010]
Furthermore, it was found that a multicolor writing instrument can be obtained by assembling a plurality of nib materials thus obtained, heating the surface again, and fusing the surface to integrate them into a rod-like body. Completed the invention.
[0011]
[Means for Solving the Problems]
According to the first aspect of the present invention,
Focusing body made of thermoplastic fibers, are integrated by the thermosetting resin solution has a thermosetting resin layer on an outer peripheral portion, and the interior forms a pen core rod-shaped made of a fiber bundle having a liquid permeable And
A pen nib material in which the surface of the pen core is heated to uniformly form an ink-impermeable thermoplastic resin layer by melting the thermoplastic fibers over the entire outer periphery of the pen core. is there.
[0012]
The invention according to claim 2 of the present invention is
The nib material according to claim 1,
The thermoplastic resin layer is
It is characterized in that thermoplastic fibers constituting the pen core are melted by direct or indirect heating.
[0013]
The invention according to claim 3 of the present invention is
In the nib material according to claim 1 or 2,
The thermoplastic resin layer is
The average thickness is 70 μm or more.
[0014]
The invention according to claim 4 of the present invention is
In the nib material according to claim 3,
The thermoplastic resin layer is
Its thickness, and is characterized in that a total of the thickness of the thermosetting resin layer is 400μm or less.
[0015]
Further, the invention according to claim 5 of the present invention is
After the bundling body made of thermoplastic fibers is impregnated with a thermosetting resin solution having a resin concentration of 2 to 17% by mass and integrated into a rod shape, the solvent is removed,
Next , the thermosetting resin is cured to form a pen core,
It is a method for producing a nib material, characterized in that the obtained rod-shaped pen core is heated to melt the thermoplastic fiber over the entire outer peripheral portion thereof to uniformly form a thermoplastic resin layer.
[0016]
The invention according to claim 6 of the present invention provides
A plurality of the nib materials according to any one of claims 1 to 4 are assembled and integrated into a rod shape, and inks of different colors are ejected from the nib materials. Multicolor writing instrument.
[0017]
The invention according to claim 7 of the present invention provides
The multicolor writing instrument according to claim 6 ,
The plurality of nib materials are:
The thermoplastic resin layers on the surfaces of the assembled nib materials are integrated by heat-melting.
[0018]
The invention according to claim 8 of the present invention provides
A plurality of nib materials having a thermoplastic resin layer that is impermeable to ink on the surface and integrated with a thermosetting resin bundle of thermoplastic fibers inside are assembled.
After melting the thermoplastic resin layer on the surface by heating and combining the nib materials together ,
A method for manufacturing a multicolor writing instrument, wherein processing is performed so that different colors of ink are ejected from each nib material.
[0019]
Further, the present invention is the invention according to claim 9,
In the manufacturing method of the multicolor writing instrument of Claim 8,
The heating is
It is characterized by being accompanied by pressurization.
[0020]
Furthermore, the invention according to claim 10 is
In the manufacturing method of the multicolor writing instrument according to claim 9,
The pressure is
The total cross-sectional area of a plurality of nib materials before heating is compressed to 80 to 95%.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, the nib material of the present invention is formed by thermoforming the bundling body 2 made of thermoplastic fibers into a desired shape, and then adhering the thermosetting resin solution by means such as impregnation. Then, the thermosetting resin is cured by heating to form a pen core in which the thermosetting resin layer 3 is partially or wholly formed on the outer periphery, the surface of the obtained pen core is reheated, and the focusing body 2 Is melted to form a thermoplastic resin layer 4 that does not transmit ink uniformly on the surface of the thermosetting resin layer 3, and the inside is composed of a fiber bundle having liquid permeability. This is a rod-shaped nib material 1 having a small diameter.
[0022]
In addition, as shown in FIG. 2, the multicolor writing instrument 20 of the present invention collects a plurality of the nib materials 1a, 1b, 1c, and as shown in FIG. 3, each nib material 1a, 1b, The thermoplastic resin layer 4 of 1c is further melted by heating, and the pen tip materials 1a, 1b, 1c are integrated with each other to form a pen tip material 10 for a multicolor writing instrument, and from each of the pen tip materials 1a, 1b, 1c, This is processed so as to eject inks of different colors, and the manufacturing method thereof will be specifically described below.
[0023]
In the present invention, the thermoplastic fibers constituting the nib material 1 include acrylonitrile, polyester, polyamide-based synthetic fibers, chemical fibers such as rayon and acetate, and animal and plant fibers such as silk, wool, and cotton, and glass. Examples thereof include various fibrous materials obtained by mixing inorganic fibers such as fibers.
[0024]
These thermoplastic fibers, Ru is selected to fit the intended use.
Some of the synthetic fibers is excellent in frictional strength, Ru Monogaa the inorganic fibers are superior to rigid.
Since natural or chemical fibers can be supplied at a low cost, they may be used alone or in combination so as to take advantage of their characteristics.
[0025]
Mixing An example is, as a relatively high melting temperature, such as polyester synthetic fiber, Ru Kumiawasegaa between having a low melting temperature such as polyvinyl chloride fibers.
In this case, the fiber having a low melting temperature melts during heating and serves as an adhesive.
[0026]
The bundle of the second thermoplastic fibers, the thermosetting resin used to the pen core rod-shaped, are stable after curing, does not change in the ink, Ru include those adhesion large.
Specifically, unsaturated polyester, urea formalin, phenol, epoxy, polyurethane resin and the like .
[0027]
These thermosetting resins are used as a solution by being dissolved in a solvent such as trichloroethylene or methylene chloride.
The resin concentration in the solution is such that these thermosetting resins are cured to obtain a rod-shaped pen core, the surface of the pen core is heated, the thermoplastic fibers are melted, and the surface does not transmit ink. In order to form the plastic resin layer 4, the amount is usually 2 to 17% by mass, preferably 2 to 16% by mass, and more preferably 2 to 12% by mass, although it greatly depends on the diameter of the rod-shaped body.
[0028]
When a resin solution in this resin concentration range is used, a very good thermoplastic resin layer 4 can be formed .
If the amount is less than 2 wt%, in a state where the fixed bundle of 2 is satisfactory, it is not difficult to obtain the pen core rod-shaped.
On the other hand, if it exceeds 17% by mass, the thermosetting resin is relatively too much, so that a thick and non-uniform thermosetting resin layer 3 is formed on the outer side of the focusing body 2, and the surface thereof is good. It becomes difficult to form the thermoplastic resin layer 4.
[0029]
This solvent evaporates by heating in the next step and forms a capillary gap between parallel fibers through which the liquid flows.
[0030]
A filler such as silica or calcium carbonate may be added to the resin solution in order to increase the rigidity of the product and improve the dimensional stability and wear resistance .
As such fillers, bronze powder, the thermal conductivity is good metal powder such as aluminum powder may also be used to uniformly heat the inside by the use, it is possible to improve the quality of the product.
[0031]
The resin solution can be used by adding one or more known surfactants such as polyoxyethylene allyl ether, known wetting agents such as polyethylene glycol, and resin curing catalysts.
[0032]
In the present invention, the nib material 1 is prepared by using the thermoplastic fiber and thermosetting resin solution as described above .
First, the first step is to form the thermoplastic fiber bundling body 2 into a desired shape by bundling and joining the thermoplastic fibers and then introducing them into a pipe or die heated by a heating block.
[0033]
In the first step of the, to the focusing body 2 of thermoplastic fibers molded into a desired shape, as a second step, is deposited by means such as impregnation with a solution of thermosetting resin.
[0034]
The thermosetting resin solution is attached to the bundling body 2 by immersing the bundling body 2 in a solution tank. By spraying on the continuous bundling body by spraying, it can be sprayed. It can also be done.
[0035]
Focusing body 2 of thermoplastic fibers solution adheres appropriate amount, as a third step, dried by heating to such allowed to pass through a drying oven which has been heated to the required temperature.
As a result, the solvent in the solution evaporates and the thermosetting resin is cured to form a rod-shaped pen core, and this heating is performed in one or several stages.
[0036]
The pen core having the thermosetting resin layer 3 formed on the surface by the curing of the thermosetting resin is heated by the heating pores in the fourth step.
[0037]
This heating pore is usually a nozzle that directly or indirectly heats the thermoplastic fiber bundling body 2 and has a cross-sectional area and a taper smaller than the cross-sectional area of the pen core. When passing, the bundling body 2 constituting the pen core is softened or melted, and the ink-impermeable thermoplastic resin layer 4 is formed on the surface of the rod-shaped pen core , whereby the rod-shaped nib material of the present invention is formed. 1 is obtained.
[0038]
The nib material 1 thus obtained has an ink non-permeable thermoplastic resin layer 4 formed on the surface thereof .
The thermoplastic resin layer 4 is entirely is uniform, the average thickness of 70μm or more, it is not preferable in particular having a thickness of at least 80 [mu] m.
More preferably , the total sum of the thickness of the thermosetting resin layer 3 formed on the inner side of the thermoplastic resin layer 4 is at most 400 μm, particularly 300 μm or less .
[0039]
When the thickness of the thermoplastic resin layer 4 is less than 70 μm on average, the ink oozes out and cannot be practically used .
Further , the thickest part is the sum of the thermosetting resin layer 3 formed on the outer side of the focusing body 2 and the thermoplastic resin layer 4 having an average of 70 μm or more formed on the outer side of the thermosetting resin layer 3. When the thickness is 400 μm or more, the thermoplastic fibers are confined inside the thick thermosetting resin layer 3 .
[0040]
Therefore, even when heated from the outside using the heating pores, the thermosetting resin acts to obstruct the action of the thermoplastic fibers to melt and bind to each other. Since the thermoplastic resin layer 4 is difficult to be formed and ink leakage may occur, it is preferable that the thermoplastic resin layer 4 has an average of 80 μm or more and the total with the thermosetting resin layer 3 is 300 μm or less even at the thickest part. It is desirable that
[0041]
The thermosetting resin layer 3 is not such may be thinned in the range capable of maintaining the strength of the nib material 1.
At this time, when the thickness of the maximum portion is 70 μm or less, in the present invention, the thermoplastic resin layer 4 and the thermosetting resin layer 3 melted by the heating pores are mixed, and the thermosetting resin layer 3 can be visually recognized. to become without to avoid desirable from top to prepare.
At that time, the thickness can be reduced as long as ink bleeding and the strength of the pen tip are not impaired.
[0042]
In order to increase the thickness of the non-ink-permeable thermoplastic resin layer 4 of the nib material 1, it is effective to increase the temperature of the heating pores or to increase the passage time to the heating pores .
The material and the nib material, since the thickness by conditions such as the outside diameter is different, the thickness of the thermoplastic resin layer 4 can be more than an average 70 [mu] m, the shape of the heating pores, temperature, transit time, etc. It is desirable to obtain this experimentally in advance.
[0043]
In order to set the thickness of the thermoplastic resin layer 4 to an average of 70 μm or more and the total thickness with the thermosetting resin layer 3 to 400 μm or less even at the thickest portion, as described above, the thermosetting to impregnate the focusing body 2 is performed. It is particularly effective to adjust the concentration of the conductive resin solution to a range of 2 to 17% by mass .
Also, known means such as instant drying and curing of the thermosetting resin solution by internal heating such as microwaves can be used to prevent uneven distribution of the thermosetting resin on the outer peripheral portion.
[0044]
The rod-shaped nib material 1 is excellent as a nib material, and a plurality of these 1a, 1b, and 1c are assembled and integrated, that is, the nib materials 1a, 1b, and 1c having a small diameter are integrated. A multi-color writing tool pen tip is formed by assembling a plurality of multi-color writing tool nibs, cutting each multi-color writing tool nib to an arbitrary size, and polishing the tip into a cannonball shape, for example, a nib for a multi-color writing instrument 10 is assumed.
[0045]
At that time, the nib materials 1a, 1b, and 1c may be cut into arbitrary dimensions, and then integrated when preparing the nib for a multicolor writing instrument, and then the tip may be polished.
[0046]
Examples of a method for integrating the plurality of nib materials 1a, 1b, and 1c include a method of using an adhesive, a tubular coupler, and a method of covering with a synthetic resin film .
However , as described above, the heating pores that can be heated while being pressurized are used to heat the thermoplastic resin layer 4 formed on the surface of the nib materials 1a, 1b, and 1c to a temperature higher than the melting point of the thermoplastic resin. As shown in FIG. 3, it is preferable that the surfaces of the nib materials 1 a, 1 b, and 1 c are fused and integrated to form a large-diameter multicolor writing instrument nib 10 composed of a plurality of thin nib materials.
[0047]
The pressurization for the integration is preferably performed using pores having a pore diameter area that can compress the actual cross-sectional area of the nib material before heating to 80 to 95%, particularly 85 to 90%.
[0048]
The bar-shaped multi-color writing instrument nib 10 thus prepared has a plurality of independent passages .
For example, if the tip is polished into a bullet shape and the rear ends of a plurality of nib materials 1a, 1b, and 1c are inserted into batting filled with different colors of ink, different inks are passed through the passages. There is provided, without being mixed, the multicolor writing instrument 20 that is capable of writing independently.
[0049]
At that time, as shown in FIG. 4, if the outer periphery in the vicinity of the rear end portion of the nib 10 for a multicolor writing instrument is scraped off, a melted portion where a plurality of nib materials 1a, 1b, 1c are bonded to each other. Is removed .
Accordingly, the pen tip materials 1a, 1b, and 1c can be easily separated only in the vicinity of the rear end portion, and the pen tip materials 1a, 1b, and 1c can be easily inserted into different fillings 2a, 2b, and 2c.
[0050]
Further, as shown in FIG. 5, an arrowhead-shaped projection 6 directed toward the pen tip insertion hole 5 a is arranged at the axial center of the pen shaft main body 5 , and each pen tip is arranged so as to surround the projection 6. If a plurality of battings 2a, 2b, 2c corresponding to the materials 1a, 1b, 1c are arranged, a plurality of pen tips can be obtained simply by inserting the pen tip 10 for a multicolor writing instrument of the present invention into the pen tip insertion hole 5a. The materials 1a, 1b, and 1c are separated from each other .
Moreover, the rear end part of each nib material 1a, 1b, 1c can also be inserted in the said batting 2a, 2b, 2c, and the assembly operation | work which inserts the rear end part of each nib material in several batting is simplified. be able to.
[0051]
When integrating a plurality of nib materials, there is no particular restriction on how to arrange the nib materials .
For example, if three nib materials are aligned and integrated into a regular triangular cross section, the tip of the tip is polished into a cannonball shape, and each pen is rotated 120 degrees to write a different color. A multicolor writing instrument capable of writing a line can be obtained.
[0052]
Further, when the integrated four pen tip material are aligned in the cross-sectional square shape, each of rotating 90 degrees, it is possible to obtain a multi-color writing instrument writing lines of different colors can be written.
Furthermore, when three nib materials are aligned and integrated in series, a multicolor writing instrument that can write three color lines at a time can be obtained, so how to arrange nib materials according to the application. May be set as appropriate.
[0053]
In addition, for ink supplied to a plurality of integrated nib materials, inks of different colors and components are usually used, but it is naturally possible to supply inks of the same color.
[0054]
Further, the plurality of nib materials 1a, 1b, and 1c are in close contact with each other at the outer periphery of the nib for the multicolor writing instrument as shown in FIG. 3, but between the nib materials 1a, 1b, and 1c, it is also possible to provide a slight gap C.
Therefore , the gap C can be used as an air hole through which the inside of the pen shaft main body and the outside air pass, and can be used without any problem even when the pen shaft main body has no air hole.
[0055]
【Example】
Examples of the nib of the present invention will be described below.
<Example 1>
A polyester fiber bundle having an outer diameter of 3.6 mm is solidified with a urethane resin solution (concentration: 10% by mass, solvent: methylene chloride) by a conventional method to obtain a rod-like body .
The obtained rod-shaped body is passed through a pore die (pore diameter φ3.2 mm) heated to 270 ° C., which is equal to or higher than the melting point of the polyester fiber, so that the outer diameter is φ3.4 mm while the outer peripheral portion is fused, and the surface is ink. the thermoplastic resin layer not penetrate, but its interior, to give the pen tip material of the rod-like formed of fiber bundles having a liquid permeable.
FIG. 6 shows a micrograph of the cut surface of the obtained nib material, and FIG. 7 shows an enlarged part thereof. Moreover, the conceptual diagram was shown in FIG.
6 and 7, portions of the black, Ru Oh in part made of a thermosetting resin layer 3 for fixing the fiber bundles 2 and the fiber bundle 2 having a liquid-permeable.
As shown in FIG. 8, the white portion on the surface is the thermoplastic resin layer 4 that does not transmit ink, and the resin layer is uniformly formed with an average thickness of 122 μm .
The total of the thermoplastic resin layer 4 and the thermosetting resin layer 3 had a thickness of 225μm at the maximum portion.
Three nib material of the rod-like body, are aligned in the cross-section an equilateral triangle, again, is more polyester fiber melting, through the pores die heated to a temperature 310 ° C. (pore diameter 5.3 mm), 3 The surface of the rod-shaped body of the book was deformed and fused to obtain a pen-shaped nib for a multicolor writing instrument having a rod-shaped body of φ5.5 mm.
The rod-like body shaped multicolor writing instrument nib, those having three independent ink path, the tip and ammunition polishing, three in the rear part respectively of the nib material, filled with ink of a different color When it was incorporated as a multicolor writing instrument by being inserted into each padding, it was excellent in that writing lines of different colors could be written every time it rotated 120 degrees.
[0056]
<Comparative Example 1>
A rod-shaped nib material was obtained in the same manner as in Example 1 except that a urethane resin solution having a concentration of 20% by mass was used as the resin solution.
FIG. 9 shows a micrograph of the cut surface of the obtained nib material, FIG. 10 shows an enlarged view thereof , and FIG. 11 shows a conceptual diagram thereof.
The average thickness of the thermoplastic resin layer 4 of the nib material was 117 μm, and the total of the thermoplastic resin layer 4 and the thermosetting resin layer 3 was 600 μm at the maximum.
As is apparent from FIG. 10 , in this nib material, the thermosetting resin layer 3 for fixing the fiber bundle 2 is not uniform, and the formation of the uniform thermoplastic resin layer 4 on the surface is obstructed and the ink is transmitted. The thermoplastic resin layer which has the characteristic of not doing is not formed.
As a matter of course, even if a nib for a multicolor writing instrument is prepared in the same manner as in Example 1 using such a nib material, each ink is mixed and a good one is obtained. I can't.
[0057]
【The invention's effect】
Nib material of the present invention, the focusing body made of thermoplastic fibers are integrated with a thermosetting resin, to form a pen core rod-shaped with a thermosetting resin layer on the surface, the thermal curing of the pen core Since the non-ink-permeable thermoplastic resin layer by melting the thermoplastic resin is uniformly formed on the entire surface of the adhesive resin layer, the ink attached to the bundling body does not ooze out on the surface.
[0058]
The nib material manufacturing method of the present invention was obtained by once integrating a bundle of thermoplastic fibers with a thermosetting resin to form a pen core having a thermosetting resin layer on the surface . A nib material that prevents ink from leaching to the surface by a simple method of melting the internal thermoplastic fibers and forming a thermoplastic resin layer on the surface of the pen core while further heating the pen core under pressure. Can be easily and easily mass-produced.
[0059]
Furthermore, the multi-color writing instrument of the present invention is an integrated unit of a plurality of the nib materials described above, and an ink non-permeable layer is formed on each surface, and each ink flow path is completely independent. Therefore, it is possible to perform writing of various colors with one writing instrument without mixing colors .
Moreover, the characteristics of the fiber bundle pen tip, that is, the smooth flow of the liquid such as ink, the sustainability of writing, and the rigid wear resistance are excellent due to the capillary gap formed by the fiber bundle.
[0060]
In addition, the method for producing a multicolor writing instrument of the present invention integrates a plurality of the above nib materials, and in particular, heats and melts the surfaces thereof to integrate it into a thick bar-shaped multicolor writing nib. In this simple process, it can be continuously manufactured .
The nib material used for the multicolor writing instrument thus obtained becomes a desired nib simply by cutting to the required dimensions and polishing the tip.
[0061]
In addition, their dimensions and shapes are always constant, and there is no risk of variations in quality and size.
In addition , the manufacturing apparatus is not complicated, the manufacturing process can be greatly simplified, a multicolor writing nib having a required size and shape can be easily prepared, and a multicolor writing instrument can be easily prepared. Is something that can be made.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a nib material of the present invention.
FIG. 2 is a side view showing an example of the multicolor writing instrument of the present invention.
FIG. 3 is a cross-sectional view of a main part showing an example of a nib of a multicolor writing instrument in which a plurality of nib materials shown in FIG. 1 are assembled and integrated.
FIG. 4 is an explanatory diagram showing a method of manufacturing a nib of a multicolor writing instrument.
FIG. 5 is an explanatory view showing an assembling method of the multicolor writing instrument of the present invention.
FIG. 6 is a micrograph of a cut surface of a nib material according to the present invention.
7 is an enlarged micrograph of a part of FIG.
FIG. 8 is a conceptual diagram of FIG.
FIG. 9 is a micrograph of a cut surface of a nib material as a comparative example.
FIG. 10 is an enlarged micrograph of a part of FIG.
FIG. 11 is a conceptual diagram of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Nib material 2 Convergence body of thermoplastic fiber 3 Thermosetting resin layer 4 Thermoplastic resin layer 10 Nib material for multicolor writing instruments 20 Multicolor writing instruments

Claims (10)

Focusing body made of thermoplastic fibers, are integrated by the thermosetting resin solution has a thermosetting resin layer on an outer peripheral portion, and the interior forms a pen core rod-shaped made of a fiber bundle having a liquid permeable And
A pen nib material characterized in that the surface of the pen core is heated to uniformly form an ink-impermeable thermoplastic resin layer by melting the thermoplastic fibers over the entire outer periphery of the pen core. The thermoplastic resin layer is
The nib material according to claim 1, wherein a thermoplastic fiber constituting the pen core is melted by direct or indirect heating. The thermoplastic resin layer is
3. The nib material according to claim 1, wherein the average thickness is 70 μm or more. The thermoplastic resin layer is
4. The nib material according to claim 3, wherein the thickness is 400 μm or less in total with the thickness of the thermosetting resin layer. 5. After the bundling body made of thermoplastic fibers is impregnated with a thermosetting resin solution having a resin concentration of 2 to 17% by mass and integrated into a rod shape, the solvent is removed,
Next , the thermosetting resin is cured to form a pen core,
A method for producing a nib material, characterized in that the obtained rod-shaped pen core is heated and the thermoplastic fiber is melted on the entire outer periphery to uniformly form a thermoplastic resin layer. A plurality of the nib materials according to any one of claims 1 to 4 are assembled and integrated into a rod shape, and inks of different colors are ejected from the nib materials. Multicolor writing instrument. The plurality of nib materials are:
The multicolor writing instrument according to claim 6, wherein the thermoplastic resin layer on the surface of each assembled nib material is integrated by heat-melting. A plurality of nib materials having a thermoplastic resin layer that is impermeable to ink on the surface and integrated with a thermosetting resin bundle of thermoplastic fibers inside are assembled.
After melting the thermoplastic resin layer on the surface by heating and combining the nib materials together ,
A method for producing a multicolor writing instrument, wherein processing is performed so that different colors of ink are ejected from each nib material. The heating is
The method for producing a multicolor writing instrument according to claim 8, wherein the method involves pressurization. The pressure is
The method for producing a multicolor writing instrument according to claim 9, wherein the total cross-sectional area of the plurality of nib materials before heating is compressed to 80 to 95%.

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