JP2011020443A - Liquid supply core made of fiber, and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid supply core made of fibers easily adjusted in hardness and porosity and meeting broad request quality, and a method for manufacturing the liquid supply core made from fiber. <P>SOLUTION: The liquid supply core 1 made from fiber is formed by mixing a large number of two or more kinds of fibers including main fibers and heat fusion fibers having low fusing point parts lower in fusing point than the main fibers, at a part or the whole of the outer surface at least, lining them up in a longitudinal direction and bundling and compressing them. The liquid supply core 1 is bound by the low fusing point parts when heat fusion between the fibers is carried out in a state of having open cells between the fibers and formed into solid bar shape with a fiber direction pointing in the longitudinal direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a liquid supply core useful for supplying a liquid by utilizing a capillary phenomenon, such as a nib and a core material of a fragrance container. The present invention relates to a supply core and a method for producing the fiber liquid supply core.

A fiber bundle of fiber, such as wool, acrylic fiber, nylon fiber, and polyester fiber, is heated through a forming die to form the required cross-sectional shape and dimensions, followed by thermosetting melamine, epoxy, phenol, etc. There is one obtained by a manufacturing method (for example, Patent Document 1) in which the resin binder liquid is dipped in the resin binder liquid, dried and primary cured with a drying apparatus, and further cured through a heating apparatus.
However, in the case of using a fiber liquid supply core in which a synthetic fiber such as polyester disclosed in Patent Document 1 is impregnated with a thermosetting resin such as melamine as a pen tip, an unreacted product of the monomer in the thermosetting resin May chemically react with the ink, causing clogging and the like, and may cause ink fading during writing.
Further, in the fiber liquid supply core, it is difficult for the thermosetting resin to be evenly adhered to the fiber bundle. When the liquid supply core transports ink to the pen tip or the pen tip portion, ink outflow and ink supply are performed. There was also a drawback that the capillary phenomenon became non-uniform and the ink outflow amount varied.
Furthermore, when impregnating the fiber bundle with the thermosetting resin, it is necessary to dilute the resin with an organic solvent, and since the organic solvent is often harmful, an apparatus for drying and recovering the solvent must be installed. However, a lot of capital investment costs were required, and there were problems that caused high costs and worsened the working environment.
In addition, a fiber liquid supply core made of a fiber assembly impregnated with a thermosetting resin is a mixture of a thermosetting resin and a thermoplastic resin, and becomes irreversible after curing, so it cannot be recycled. .

On the other hand, a fiber assembly is formed by bundling a large number of one kind of heat-fusible conjugate fibers including a low-melting polymer, and the fiber assembly is heated to a temperature equal to or higher than the melting point of the low-melting polymer, There is a pen core for a writing instrument (for example, Patent Document 2) obtained by a production method in which a low melting point polymer is melt-bound.
More specifically, for example, this conventional technique is a sheath-core type composite fiber in which a high melting point polymer is coated with a low melting point polymer concentrically (see FIG. 2 of Patent Document 2), Bonded conjugate fiber (see Fig. 3 of Patent Document 2), one half of which is a high-melting polymer and the other half is a low-melting polymer, alternating layers of high-melting polymer and low-melting polymer Only a composite fiber in which a part having a different melting point is formed for one fiber, such as a multilayer type composite fiber (see FIG. 4 of Patent Document 2) arranged in the above is used.
However, as in the prior art (Patent Document 2), in the manufacturing method using only the composite fiber, not only the molding defect such as the outer diameter defect of the fiber liquid supply core occurs but also the composite used. There is a problem that it is difficult to control the porosity, which is the ratio of hardness and voids, because the ratio of the binder portion (the low melting point polymer) that plays a role of fusion bonding with fibers is naturally defined.
In addition, the synthetic fiber that can be used as a heat-bonding fiber is limited to only the heat-fusible composite fiber that is distributed in the market, and the binder part melts in the polishing process that is a nib manufacturing process. There is a problem that clogging due to melting of the resin occurs on the polished surface, and a stable ink flow cannot be obtained as a pen tip, or the ink flow is reduced.
Japanese Patent Publication No.53-16736 Japanese Patent Publication No.54-688

  The problem to be solved by the present invention is firstly made of a fiber useful as a pen tip for a writing instrument capable of supplying pores and supplying a liquid at a desired speed without using a thermosetting resin as a curing agent. To provide a liquid supply core. The second is to provide a fiber-made liquid supply core that can meet a wide range of required qualities, with easy adjustment of hardness and porosity. And thirdly, when the fiber liquid supply core is polished, the pores of the polishing surface are not blocked by melting of the fiber, etc., and a stable ink flow is obtained as a nib, which can withstand polishing. The object is to provide a liquid supply core and a method for producing the fiber liquid supply core.

  In order to achieve such an object, the technical means according to the present invention includes at least the following constituent elements.

  The fiber liquid supply core according to the present invention includes two or more kinds of fibers including a main fiber and a heat-sealing fiber having a low melting point part having a melting point lower than that of the main fiber on at least part or all of the outer surface. Is a fiber liquid supply core formed by mixing a large number of fibers and bundling and compressing them in the longitudinal direction, and is bound by the low melting point when the fibers are thermally melted with continuous pores between the fibers. It is characterized by being formed in the shape of a solid bar whose direction is directed in the longitudinal direction.

  Further, in the method for manufacturing a fiber liquid supply core according to the present invention, a plurality of two or more kinds of fibers including the main fiber and the heat-fusible fiber are mixed and aligned in the longitudinal direction to form a mixed fiber bundle. The mixed fiber bundle is compressed in the bundling direction, and heated at a temperature higher than the melting point of the low melting point portion of the heat-fusible fiber and lower than the melting point of the main fiber, thereby thermally melting the low melting point portion. In addition, the fibers are bound by the heat-melted low melting point portion.

In addition, the preferred technical means includes the following constituent elements.
(1) Both are made of fibers having continuous pores that are heated and melt-bonded while compressing a fiber bundle formed by mixing two or more synthetic fibers having a melting point of 150 ° C. or higher and a difference in melting point of 20 ° C. or higher. Liquid supply body.
(2) In the fiber liquid supply body, 1 to 20 denier heat-sealing fibers and 1 to 20 denier fibers that do not melt at the melting point of the heat-sealing fibers are mixed to melt the heat-sealing fibers. The fiber liquid supply body according to the above item (1), characterized in that it is a hot melt binding processed body in which the fibers are partially bound.
(3) The above-mentioned (2), wherein the heat-fusible fiber of the fiber liquid supply body is a synthetic fiber having only one melting point or a composite fiber including a polymer having a part of a low melting point. The fiber liquid supply body according to item.
(4) Item (3) above, wherein the mixing ratio of the heat-sealing fiber to the fiber that does not melt at the melting point of the heat-sealing fiber is 10/90 to 90/10%. Fiber liquid supply body.

By having such characteristics, the present invention has the following effects.
Since it is a structure formed by mixing two or more kinds of fibers including the main fiber and the heat-sealing fiber, the adjustment of the mixing ratio can easily adjust the hardness and the porosity, and consequently Thus, it is possible to provide a fiber liquid supply core that is useful as a pen tip for a writing instrument that can secure pores and supply a liquid at a desired speed and can meet a wide range of required qualities.
That is, in the prior art using only the composite fiber (see Patent Document 2), for example, when adjusting the hardness and porosity with the same fiber density design (in other words, the hardness and porosity without changing the fiber density) If the ratio is to be adjusted), it is necessary to adjust the ratio of the high melting point portion and the low melting point portion of the composite fiber, which requires changing the type of the composite fiber to be used. However, in this invention, it is not necessary to change the kind of fiber to be used, and it can be easily handled by adjusting the mixing ratio of the fibers to be used.

  In addition, if 10% or more of the synthetic fiber, which is the main fiber having a higher melting point than the heat-sealing fiber, is mixed and molded, the molding stability such as improvement in dimensional accuracy can be achieved, and the heat-sealing fiber serving as the binder can be obtained. By changing the ratio at an arbitrary ratio, it is possible to easily control the nib hardness and the porosity, and it is possible to provide a fiber liquid supply core having a degree of freedom in nib design.

Also, if the melting point of the low melting point portion is 170 ° C. or higher and the polishing surface is formed on at least a part of the outer surface, it is possible to prevent clogging due to melting of the resin on the polishing surface.
In particular, if two or more kinds of synthetic fibers having a melting point difference of more than 20 ° C. and a fiber diameter of 1 to 20 denier are used, both the main fiber and the low melting point have a melting point of 170 ° C. or higher. It is possible to provide a liquid supply core made of a fiber for a pen tip for a writing instrument, which has stable properties and capillary formation.

  In addition, the heat-sealing fiber serving as a binder is not limited to a composite fiber, and may be a synthetic fiber made of a single polymer having a lower melting point than a fiber that can be a main fiber that does not melt at the melting point of the heat-sealing fiber, By providing the heat-sealing fiber with a range of choice, it is possible to provide a fiber liquid supply core having a degree of freedom in design.

  In addition, if the thickness of the heat-sealing fiber is made thinner than the thickness of the main fiber, the number of binding sites around the main fiber is increased and the adhesion strength between the fibers is increased, so that durability and compression resistance can be improved. In particular, a fiber liquid supply core suitable for use as a nib can be provided.

In addition, the fiber liquid supply core that does not use the thermosetting resin of the present invention does not use an organic solvent, so that not only the installation of an apparatus for drying and recovering the solvent is unnecessary, but also a large amount of capital investment for that purpose. Costs can be eliminated, and as a result, production costs can be reduced, and a fiber liquid supply core can be provided without deteriorating the working environment caused by volatilization of organic solvents.
In addition, with regard to recyclability, which has become a worldwide concern in recent years, it is considered that recycling is possible with the same material such as PET / LPET and PA66 / PA6. Can be provided.

The side view which shows one Example of the fiber-made liquid supply cores. The schematic diagram which shows the expanded cross section of one Example of the fiber-made liquid supply cores. The schematic diagram which shows the expanded cross section of the other Example of the fiber-made liquid supply core. The schematic diagram which shows an example of the manufacturing method which uses a thermosetting resin. The schematic diagram which shows an example of the manufacturing method of this invention goods. The perspective view which shows an example of the pen point for writing made with the fiber-made liquid supply core of this invention product.

  The present invention will be specifically described below.

  The fiber liquid supply core 1 according to the present invention includes two or more kinds of main fiber and a heat-sealing fiber having a low melting point part having a melting point lower than that of the main fiber on at least part or all of the outer surface. A synthetic fiber is mixed to form a mixed fiber bundle, and the mixed fiber bundle is compressed in the bundling direction, and is higher than the melting point of the low melting point portion of the heat-sealing fiber and lower than the melting point of the main fiber. By heating at a temperature, the low melting point portion is thermally melted, and the low melting point portion that has been melted by heat binds the fibers and forms continuous pores between the fibers. It is formed into a solid rod shape in which the fiber direction is directed in the longitudinal direction by a manufacturing method in which the fiber is formed into dimensions and then cut to a specified length.

The main fiber is a fiber that does not melt at the melting point of the heat-fusible fiber, that is, does not melt at the molding temperature.
Specific examples of the main fiber include acrylic fiber, polyester fiber, nylon fiber, vinylon fiber, polyamide fiber, polypropylene fiber, polyethylene fiber, vinyl chloride fiber, and acetate fiber.

The heat-sealing fiber is a fiber having a low melting point part having a melting point lower than that of the main fiber on at least a part or all of the outer surface, and the low melting point part melts at the time of molding processing, Serves as a binder fiber for the supply core.
Specific examples of the heat-fusible fiber, the entire fiber of which is the low-melting point portion, are composed of a single polymer such as a low-melting polyamide fiber, a low-melting polypropylene fiber, a low-melting polyester fiber, or a low-melting polyethylene fiber. A low melting point fiber is mentioned.
Further, as a specific example of the heat-fusible fiber having a low melting point part having a melting point lower than that of the main fiber on a part or all of the outer surface, a part of the outer peripheral part of the fiber is a low melting point polyester polymer. (Low melting point portion) with the remainder being a high melting point polyester polymer composite fiber, part of the fiber outer periphery is a low melting point polymer 6 nylon (low melting point portion) and the remainder is a high melting point polymer nylon 66 From composite fibers made of polybutylene terephthalate (low melting point part) with a low melting point and a high melting point polyethylene terephthalate in the outer periphery, and other known composite polymer materials such as core-sheath type and multilayer type And the like.

  In the fiber liquid supply core of the present invention, in order to obtain quality such as writing pen tip or liquid supply core useful hardness, porosity, dimensions, etc., the mixing ratio of the heat-sealing fibers as the binder component is: 10% to 90% is preferable. Further, from the viewpoint of stability of quality variation such as hardness, porosity and dimensional accuracy of the fiber liquid supply core, the mixing ratio of the heat-sealing fibers is 20% to 80% is preferable. In addition, when the fiber liquid supply core is ground into a nib shape, the material with a small amount of molten binder resin will loosen the fibers and cause salmon, and heat fusion will not ensure the shape stability during polishing. The fiber is preferably 20% or more.

The main fiber and the low melting point part preferably both have a melting point of 170 ° C. or higher from the viewpoint of preventing pores from being blocked by the fiber melted during the polishing process. Preferably, both have a melting point of 180 ° C. or higher.
Furthermore, the difference between the melting points of the main fiber and the low melting point is preferably greater than 20 ° C., more preferably 40 ° C. or more, from the viewpoint of facilitating temperature control during molding.

  Embodiments of the present invention will be described based on examples.

  Table 1 shows examples of the fiber liquid supply core of the present invention together with comparative examples.

  In Comparative Example 1 of Table 1 above, a sliver designed so that the density of PET / LPET composite fiber [4d] 100% (heat-bonded fiber only) with a melting point of LPET of 180 ° C. is 4,000 d / mm 2 is used. An example is shown in which a fiber liquid supply core is obtained in which a LPET binder (low melting point portion) is passed through a mold [nozzle shape] and the fibers are converged in the longitudinal direction. However, with 100% composite fiber, the outer diameter accuracy was poor, and only a fiber rod-like body with poor appearance such as stripes could be produced, and a stable fiber liquid supply core could not be obtained. The PET means polyethylene terephthalate, the LPET means low melting point polyethylene terephthalate, and the d means denier.

  In Comparative Example 2, a 260 ° C. melting point PET fiber [4d] (main fiber only) was molded by passing the designed sliver through a mold [nozzle shape] so that the fiber density was 4,000 d / mm 2 at 100%. The results are illustrated. In the molding of the PET fiber only, it becomes almost fibrous when processed below the melting point of the PET fiber, and cannot be continuously drawn, and when molded at the melting point of the PET fiber or higher Almost all the fibers were melted and could not be picked up at all, and the fiber liquid supply core could not be obtained.

  In Comparative Example 3, PET fiber (thickness 3d, melting point 260 ° C) as the main fiber and PET / LPET composite fiber (thickness 4d, PET melting point 260 ° C, LPET melting point 120 ° C) as the heat-sealing fiber The two types of fibers are mixed at a ratio of 70:30 to illustrate the result when a fiber liquid supply core is obtained, and although a rod-like body of the fiber liquid supply core can be obtained, The fiber liquid supply core cannot withstand polishing because the melting point of LPET is as low as 120 ° C., and is unsuitable for purposes that require post-processing such as nib processing.

  In Comparative Example 4, PBT fiber as the main fiber (thickness 3d, melting point 220 ° C) and PET / LPET composite fiber as the heat-sealing fiber (thickness 2d, PET melting point 260 ° C, LPET melting point 200 ° C) These two types of fibers are mixed at a ratio of 70:30, and the sliver designed so as to have a fiber density of 4,000 d / mm 2 is passed through a mold [nozzle shape] and molded. . Because the difference in melting point between the PBT fiber and LPET is only 20 ° C, the PBT fiber also melts when molded above the melting point of LPET, and conversely at the molding processing temperature below the melting point of LPET it is almost fibrous. It was not possible to pull it out as it was, and a fiber liquid supply core could not be obtained.

  In Example 1 in Table 1, PET fiber (thickness 3d, melting point 260 ° C.) as the main fiber and PET / LPET composite fiber (thickness 4d, melting point 260 ° C. of PET, LPET binder, which is designed to mix two types of fibers with a melting point of 180 ° C and a ratio of 90:10, and pass through a mold [nozzle] so that the fiber density is 4,000d / mm2. Minutes (low melting point portion) were melted and bonded to obtain a fiber liquid supply core 1 in which the fibers were converged in the longitudinal direction. After that, in the fiber liquid supply core 1, the raw rod is cut to a specified length, and the tip and rear end shapes are formed by a method such as polishing, which can withstand polishing without using a substantially shell-shaped thermosetting resin. An ester fiber writing instrument nib was obtained.

  In Example 2, PET fiber as the main fiber (thickness 3d, melting point 260 ° C) and PET / LPET composite fiber as the heat-sealing fiber (thickness 4d, PET melting point 260 ° C, LPET melting point 180 ° C) These two types of fibers are mixed at a ratio of 70:30, and the blended cotton sliver designed so that the fiber density is 4,000 d / mm 2 is passed through the mold [nozzle shape] and the LPET binder content (low melting point part) ) Was melt-bonded to obtain a fiber liquid supply core 1 in which the fibers were converged in the longitudinal direction. Thereafter, the fiber liquid supply core 1 is cut to a specified length, and the tip and rear end shapes are formed by a method such as polishing, and the pen tip for a writing instrument made of ester fiber that does not use a substantially shell-shaped thermosetting resin. Alternatively, a supply core such as an ink induction core could be obtained. In Example 2, a fiber liquid supply core having a cross-sectional hardness of 27 and slightly harder than that illustrated in Example 1 could be obtained. Moreover, the porosity of this Example 2 was 65%, and became smaller than the porosity of Example 1.

  In Example 3, PET fibers (thickness 3d, melting point 260 ° C.) as main fibers and PET / LPET composite fibers (thickness 4d, PET melting point 260 ° C., LPET melting point 180 ° C.) as heat-sealing fibers The two types of fibers are mixed at a ratio of 50:50 to obtain a fiber-made liquid supply core 1. In Example 3, a fiber liquid supply core having a cross-sectional hardness of 42 and a hardness higher than that illustrated in Example 2 could be obtained. In addition, the porosity of Example 3 was 61%, which was even smaller than the porosity of Example 2.

  That is, it can be said from Examples 1 to 3 that the higher the ratio of the heat-sealing fiber to the main fiber, the higher the hardness and the lower the porosity.

  In Example 4, two types of fibers, PET fibers (thickness 3d, melting point 260 ° C.) as main fibers and PBT fibers (thickness 3d, melting point 170 ° C.) as heat-fusible fibers, are 70:30. The blended cotton sliver designed to have a fiber density of 4,000 d / mm2 is passed through the mold [nozzle shape] to melt and bond the PBT binder (low melting point), and the fibers in the longitudinal direction. The result which obtained the raw | natural stick | rod used as the fiber liquid supply core 1 converged in FIG.

  In Example 5, PET fiber as the main fiber (thickness 3d, melting point 260 ° C) and core-sheath type PET / PBT composite fiber (thickness 1.5d, PET melting point 260 ° C, PBT as the heat-sealing fiber) 2 types of fibers are mixed at a ratio of 70:30, and a mixed cotton sliver designed to have a fiber density of 4,000 d / mm 2 is passed through a die [nozzle] to form a PBT binder. The result of obtaining a fiber-made liquid supply core in which the fibers (the low melting point portion) are melt-bound and the fibers are focused in the longitudinal direction is illustrated.

  Further, in Example 6, two types of fibers, namely, a PA66 fiber (thickness 6d, melting point 260 ° C.) as a main fiber and a PA6 fiber (thickness 3d, melting point 220 ° C.) as a heat-sealing fiber, are used. : Mix at a ratio of 30 and pass the designed mixed cotton sliver through the mold [nozzle shape] so that the fiber density is 4,000 d / mm2, melt the PA6 binder (low melting point part), and bond the fibers. A fiber liquid supply core 1 concentrated in the longitudinal direction is illustrated.

  In Example 7, PET fibers (thickness 3d, melting point 260 ° C.) as main fibers, and PET / LPET composite fibers (thickness 2d, PET melting point 260 ° C., LPET melting point 200 ° C. as heat-sealing fibers. )), And the blended cotton sliver designed so that the fiber density is 4,000 d / mm 2 is passed through the mold [nozzle] and the LPET binder content (low) The fiber melting point) was melt-bound to obtain a fiber liquid supply core 1 in which the fibers were converged in the longitudinal direction. Thereafter, the fiber liquid supply core 1 is cut to a specified length, and the tip and rear end shapes are formed by a method such as polishing, and the pen tip for a writing instrument made of ester fiber that does not use a substantially shell-shaped thermosetting resin. Alternatively, a supply core such as an ink induction core could be obtained.

In Example 8, PET fiber as the main fiber (thickness 3d, melting point 260 ° C.) and PET / LPET composite fiber (thickness 2d, PET melting point 260 ° C., LPET melting point 180 ° as the heat-sealing fiber. )), And the mixed cotton sliver designed to have a fiber density of 4,000 d / mm 2 is passed through the mold [nozzle] and the LPET binder content (low) The fiber melting point) was melt-bound to obtain a fiber liquid supply core 1 in which the fibers were converged in the longitudinal direction. Thereafter, the fiber liquid supply core 1 is cut to a specified length, and the tip and rear end shapes are formed by a method such as polishing, and a pen tip for a writing instrument made of ester fiber that does not use a substantially shell-shaped thermosetting resin. Alternatively, a supply core such as an ink induction core could be obtained.
The difference between Example 7 and Example 8 will be described. In Example 8, LPET having a lower melting point than that of Example 7 is used as the low melting point portion in the PET / LPET composite fiber.

  From the comparison between Example 8 and Example 2 in Table 1, if the thickness of the heat-fusible fiber is made thinner than the thickness of the main fiber (Example 8), it is compared with the case where the relationship is reversed (Example 2). Thus, it can be said that a fiber liquid supply core 1 having high hardness can be obtained.

  FIG. 1 shows an example of a fiber liquid supply core 1 according to the present invention. This fiber liquid supply core 1 is a fiber bundle having a directionality in the axial direction. A porosity with a diameter cross-sectional area ratio of 20 to 85% is formed by melt-bonding with a heat-sealing fiber having a low melting point portion (low melting point portion) to be heat-sealed, and is self-attached to each other.

FIG. 2 schematically shows an enlarged cross section of a fiber liquid supply core 1 formed by using a composite fiber as a heat-sealing fiber.
In the figure, a portion indicated by reference numeral 2 is a PET fiber as a main fiber. The portion indicated by reference numeral 3 is a PET / LPET composite fiber as a heat-sealing fiber, and in particular, the low melting point portion (LPET) in which the black-coated portion on the outer surface side melts at the molding processing temperature, and white coating on the inner side The part is a high melting point part (PET) that does not melt at the molding temperature.
In addition, although illustration is abbreviate | omitted about the expanded cross section of the actual fiber liquid supply core 1, if it explains in full detail, the black coating part (low melting | fusing point part) in FIG. The fibers are bound by the low melting point when melted by heat, and pores are formed between the fibers.

FIG. 3 schematically shows an enlarged cross section of a fiber liquid supply core 1 formed by using a low-melting fiber that is easily melted at a molding processing temperature made of a single polymer material for a heat-sealing fiber. .
In the figure, the black coating portion indicated by reference numeral 4 is PA6 (polyamide 6) fiber as a heat-sealing fiber (low melting point portion). Further, the white coating portion indicated by reference numeral 5 is PA66 (polyamide 66) fiber as a main fiber that does not melt at the molding processing temperature. That is, in this aspect, the heat-sealing fiber is configured only by the low melting point portion (the configuration does not have the high melting point portion).
In addition, although illustration is abbreviate | omitted about the expanded cross section of the actual fiber liquid supply core 1, if it explains in full detail, the black coating part (heat-fusion fiber (low melting | fusing point part)) in FIG. 3 will heat-melt. The shape is deformed, and the fibers are bound by the low melting point when melted by heat, and pores are formed between the fibers.

FIG. 4 illustrates a conventional manufacturing method for obtaining a fiber liquid supply core by a method using a thermosetting resin.
In the figure, reference numeral 6 is a mixed fiber bundle, reference numeral 8 is a resin liquid tank, reference numeral 9 is a drying furnace, reference numeral 10 is a take-up machine, and reference numeral 11 is a cutter.

FIG. 5 illustrates a production method for obtaining the fiber liquid supply core 1 of the present invention without using a thermosetting resin.
In this manufacturing method, a large number of two or more types of fibers including main fibers and heat-sealing fibers are mixed, and the fiber directions are aligned and bundled to form a mixed fiber bundle 6. The mixed fiber bundle 6 is heated with a heating block 7. At a temperature higher than the melting point of the low melting point portion of the heat-fusible fiber and lower than the melting point of the main fiber while being compressed in the bundling direction (direction perpendicular to the fiber direction). Heat, melt only the low-melting point portion of the heat-fusible fiber, bind the fibers with the melted resin of the low-melting point, and form continuous pores extending between the fibers in the fiber direction. A solid rod-like fiber liquid supply core 1 (see FIG. 1) oriented in the longitudinal direction is obtained.
Thereafter, the fiber liquid supply core 1 is cut to a specified length, and for example, one end side or both end sides in the length direction is polished into a desired shape such as a shell shape, so that the pen of the writing instrument First (see FIG. 6).

  According to the method for producing a fiber liquid supply core according to the present invention, it is not necessary to impregnate a fiber bundle with a thermosetting resin, and to blow off the organic solvent in which the thermosetting resin has been melted in a drying furnace. The concerns about environmental degradation that occurred during manufacturing were released. Further, the heat energy for volatilization / drying of the organic solvent and curing of the thermosetting resin is not required, and the product can be manufactured at a low cost and in a form friendly to the global environment. Further, as can be seen from FIG. 5, the resin liquid tank and the drying furnace are not required, and the manufacturing space can be greatly reduced.

In the preferred embodiment of the method for producing a fiber liquid supply core according to the present invention, the hardness and / or the porosity can be adjusted by adjusting the ratio between the thickness of the main fiber and the thickness of the heat fusion fiber. You may make it do.
In other words, by adjusting the ratio between the thickness of the main fiber and the thickness of the heat-sealing fiber, the number of binding sites on the outer periphery of each fiber can be adjusted, and the hardness and porosity can be adjusted by increasing or decreasing the number of binding sites. can do.
As a particularly preferred embodiment, if the thickness of the heat-sealing fiber is made thinner than the thickness of the main fiber, the number of binding sites on the outer periphery of the main fiber increases, so that the adhesive strength between the fibers can be improved.

Furthermore, as a preferable aspect of the method for producing a fiber liquid supply core according to the present invention, the ratio of the amount of the main fiber and the amount of the heat fusion fiber is adjusted to adjust the hardness and / or the porosity. You may make it do.
That is, for example, if the ratio of the amount of heat-bonded fibers to the amount of main fibers is increased, the number of binding locations on the outer periphery of each fiber increases, so the hardness of the fiber liquid supply core after molding is increased, The porosity can be reduced.

  As mentioned above, although the Example of this invention was described, this invention is not limited to these embodiment at all.

  For example, the fiber liquid supply core in the present invention is a porous body that is made of a combination of fibers having different melting points without using a thermosetting resin, has pores that communicate with each other, and can supply liquid. The fiber used for forming the fiber liquid supply core of the present invention that does not use a resin is not limited to a sliver form composed of short fibers, but a combination of filament fiber forms that are long fibers having different melting points. It may be made. In addition, the fibers used in the fiber liquid supply core are not limited to the fibers described in the examples, but can be freely selected including all fibers distributed in the market. Absent.

  Moreover, the fiber liquid supply core 1 in the present invention may be, for example, a round bar shape, a square bar shape, or a solid bar shape as appropriate in cross section.

  Moreover, in the said embodiment, although the fiber-made liquid supply core 1 was comprised by two types of fibers, the said main fiber and the said heat-fusion fiber, this invention is not limited to this, For example, the said main fiber and the said The fiber liquid supply core 1 may be constituted by three or more kinds of fibers including the heat-sealing fibers.

  In the example shown in FIG. 2, the core-sheath composite fiber is used as a particularly preferable embodiment of the heat-sealing fiber, but the heat-sealing fiber is at least partially or entirely on the outer surface than the main fiber. What is necessary is just to have a low melting point part with a low melting point, for example, a joint type composite fiber in which one half is a high melting point polymer and the other half is a low melting point polymer, or a high melting point polymer and a low melting point. A multilayer type composite fiber or the like in which the polymer layers are alternately arranged may be used, or, as illustrated in FIG. 3, all of the inside and outside may be a fiber having a low melting point.

  Moreover, in the example shown in FIG. 6, although it was set as the aspect which has a grinding | polishing surface in the both ends part of a longitudinal direction, as another example, the aspect which has a grinding | polishing surface only in the one end part side of a longitudinal direction, or a grinding | polishing surface on an outer peripheral surface It can be set as the structure which has a grinding | polishing surface in at least one part of outer surfaces, such as the aspect which has. As still another example, it is possible to adopt an aspect in which the outer surface does not have a polished surface.

  The fiber liquid supply core of the present invention is, for example, an oil-based marker, a board marker, a line marker, a paint marker, an aqueous marker, a medical marker, a plastic marker, a pen tip for a writing instrument used for a marking pen, or a liquid supply for an ink guide core. Suitable for wicks.

  The fiber liquid supply core of the present invention is useful for cosmetic purposes, for example, eyeliner, eyeshadow, eyebrow, hair dye marker, teak, lip liner, lip gloss, concealer, nail polish remover, nail care, skin care, Suitable for whitening, makeup remover, tooth cleaning, eyelash care, and liquid supply core for perfume pen.

  Furthermore, it is also useful for, for example, drug application, and in particular, liquid application or liquid uptake and volatilization liquid supply cores such as fragrances, deodorants, insect repellents, liquid shipping agents, sunscreens, sun oils, and acne remedies. Suitable for

1 Fiber supply core 2 PET fiber (main fiber)
3 PET / LPET core-sheath composite fiber (heat-bonded fiber)
4 PA6 fiber (heat fusion fiber)
5 PA66 fiber (main fiber)
6 Mixed fiber bundle 7 Heating block 8 Resin liquid tank 9 Drying furnace 10 Take-up machine 11 Cutter

Claims (8)

  A large number of two or more types of fibers including a main fiber and a heat-sealing fiber having a low melting point part having a lower melting point than that of the main fiber on at least a part or all of the outer surface are mixed and bundled together in the longitudinal direction. The fiber liquid supply core is made of a solid rod having a continuous pore between the fibers and bonded by the low melting point when the fibers are melted by heat, and the fiber direction is directed in the longitudinal direction. A fiber liquid supply core, which is formed.   2. The fiber liquid supply core according to claim 1, wherein the low melting point portion has a melting point of 170 ° C. or higher, and a polished surface is formed on at least a part of the outer surface.   The fiber liquid supply core according to claim 1 or 2, wherein a difference in melting point between the main fiber and the low melting point portion is greater than 20 ° C.   The fiber-made liquid supply core according to any one of claims 1 to 3, wherein the heat-sealing fiber is a synthetic fiber having only a single melting point or a composite fiber having the low melting point portion.   The fiber liquid supply core according to any one of claims 1 to 4, wherein a thickness of the heat-sealing fiber is made thinner than a thickness of the main fiber.   A large number of two or more types of fibers including the main fiber and the heat fusion fiber are mixed and aligned in the longitudinal direction to form a bundle of mixed fibers. The mixed fiber bundle is compressed in the bundle direction, and the heat fusion is performed. By heating at a temperature higher than the melting point of the low melting point portion of the adhering fiber and lower than the melting point of the main fiber, the low melting point portion is thermally melted, and the fibers are bound by the heat melting low melting point portion. 6. The method for producing a fiber liquid supply core according to claim 1, wherein the fiber liquid supply core is formed.   The fiber liquid according to claim 6, wherein the ratio of the thickness of the main fiber and the thickness of the heat-sealing fiber is adjusted to adjust the hardness and / or the porosity. Manufacturing method of supply core.   The fiber according to claim 6 or 7, wherein the ratio of the amount of the main fiber and the amount of the heat-fusible fiber is adjusted to adjust the hardness and / or the porosity. A method for producing a liquid supply core.