JPH11268472A - Writing utensil with ink relay tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing utensil with an ink relay tube which is suitable for a ballpoint pen, marking pen etc. SOLUTION: In the writing utensil, the forward end of a rear ink relay tube 7 which is formed from a bundle of fibers whose rear end passes through an ink retaining body 3 so as to reach an ink tank 2 is connected to the rear end of a front ink relay tube 10 which has an ink passage connected to a pen point 12. In this case, The porosity of the tube 7 formed from a bundle of fibers is 60-80%, and the tube 7 is covered with a plastic resin. Thus, assembling, inserting troubles at the time of assembling using automatic machines can be avoided, and an optimum design of capillary balance of the pen point, front ink relay tube, and rear ink relay tube can be achieved, and hence ink can flow smoothly and rapid writing can be performed so that good writing can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument having an ink relay core which can be suitably used for a ball-point pen, a marking pen and the like.

[0002]

2. Description of the Related Art Conventionally, as a writing instrument having an ink relay core, for example, as shown in FIG. 2, an ink tank a2 for directly storing ink is provided at a rear portion of a shaft cylinder a1, and a front portion of the ink tank a2 is provided. An ink reservoir (collector) a3 is arranged, and a rear ink relay core a4 made of fiber penetrates through the center of the ink reservoir a3, and the front ink relay core a6 made of plastic connected to the pen tip a5. Rear ink relay core a
4, the ink is guided from the ink tank a2 to the front ink relay core a6 by the rear ink relay core a4, and the ink is further transferred to the pen tip a5 by the ink flow passage provided in the front ink relay core a6. , That is, a direct liquid writing implement A is known.

[0003] The ink reservoir a3 of this direct liquid type writing implement A
In order to maintain the capillary balance from the ink tank a2 to the pen tip a5, the capillary force of the rear ink relay core a4 made of fiber bundles disposed therein is lower than the capillary force of the front ink relay core a6. High porosity was set to work.

However, when the porosity (for example, 60% or more) of the rear ink relay core a4 made of a fiber bundle is high, the ink flow rate is increased, but the strength is reduced, and assembling trouble such as bending or the like occurs. There is a problem in doing so. Conversely, if the porosity (for example, 40%) is set within a range that maintains the hardness of the core that can withstand automatic machine assembly, the problem is that the ink flow rate decreases, and good writing quality cannot be obtained. is there.

[0005]

An object of the present invention is to solve the above-mentioned problems, that is, to set the porosity of the rear ink relay core made of a fiber bundle so that an optimum ink flow rate can be obtained, and to set the outer skin of the same. An object of the present invention is to perform processing for imparting hardness to a portion.

[0006]

In order to solve the above-mentioned conventional problems, the present inventor has proposed that a fiber bundle core having a high porosity set at 60 to 80% is made of a plastic resin such as polyacetal or PP. The inventors have found that by coating, a fiber bundle ink relay core having a high porosity and a hardness that can withstand automatic machine assembly has been obtained, and the present invention has been completed. That is, the writing instrument having the ink relay core of the present invention has a rear end portion that penetrates the ink reservoir 3 at a rear end portion of the front ink relay core 10 having an ink flow passage connected to the pen tip 12. In a writing instrument connected to the front end of a rear ink relay core 7 made of a fiber bundle reaching the ink tank 2,
The porosity of the rear ink relay core 7 made of the fiber bundle is 60 to 8
0%, and the rear ink relay core 7 is covered with a plastic resin.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a writing instrument B provided with an ink relay core according to an embodiment of the present invention. As shown in FIG. 1, the writing implement B of the present embodiment includes a barrel 1, which forms an ink tank 2 for holding ink directly in an internal space at a rear end thereof. An ink reservoir 3 is provided in front. The ink reservoir 3 has a large number of circumferential grooves 4 arranged in the front-rear direction on the outer periphery thereof, and a front-rear passage groove 5 communicating with the grooves 4.
The rear end of the passage 5 communicates with the ink tank 2.
The ink reservoir 3 is used when the ink in the ink tank 2 expands due to a rise in temperature or the like.
In order to prevent the ink extruded from the pen tip 12 from being excessively supplied to the pen tip 12, the ink is introduced into the groove 4 from the groove 5 to absorb it, and the ink is temporarily stored in the groove 4. is there.

The ink reservoir 3 has a center hole 6 that opens in the front-rear direction, and a rear ink relay core 7 is inserted into the center hole 6.

The rear ink relay core 7 has a rear end 9
Are arranged in the ink tank 2 and connected to the front end 8 by inserting a small-diameter sharp end at the rear end of the front ink relay core 10 inserted into the front end of the center hole 6.

The front ink relay core 10 is made of, for example, a plastic core having an ink passage formed by melt extrusion. The rear ink relay core 7 is made of a fiber bundle whose outer peripheral portion is covered with a plastic resin. The front ink relay core 10 is, for example, using an extruder, after continuously cutting a long extrusion, centerless grinding to a desired outer diameter, and then short cutting to a desired dimension, It is obtained by grinding to a desired shape. The constituent material is not particularly limited as long as it can be extruded. For example, polyacetal (homopolymer / copolymer), polypropylene (PP), polyethylene (P
E), plastics such as vinylidene fluoride (PVDF), vinylidene chloride, polyester (PET), and polyamide are used, and it is desirable to select a material in consideration of moldability, cost, post-processing, and wettability with ink. Preferred materials include polyacetals (homopolymers / copolymers), polyamides, and polyesters.

Also, the rear ink relay core 7 made of the fiber bundle is provided.
For example, using PET fiber, acrylic fiber, nylon fiber, etc., these fibers are singly or bundled, then passed through a polyurethane resin or melamine resin solution tank adjusted to a desired concentration, and impregnated from the outer peripheral surface. The porosity can be obtained by adjusting the density of the bundled fibers,
It can be set by adjusting the concentration of the resin solution to be impregnated. For example, if the density of the bundled fibers is increased and the concentration of the resin solution to be impregnated is increased, the porosity can be set to be low. Can be set higher. The surface of the adjusted fiber bundle is coated with a plastic resin by an extruder equipped with a crosshead die and processed into a desired size and shape, whereby the rear ink relay core 7 is obtained. As the plastic material to be coated, any material can be used without particular limitation as long as it can be melt-extruded at a temperature of 200 ° C. or lower. However, it is desirable to select a material in consideration of cost and moldability. (PE)
Etc. can be used.

The porosity of the rear ink relay core 7 is 60
It is set to ８０80%. This is because, for example, if the porosity is less than 60%, the ink content of the rear ink relay core 7 itself is small, and the ink from the ink tank 2 to the front ink relay core 10 via the rear ink relay core 7 is reduced. The supply amount decreases, and as a result, the ink supply amount to the pen tip 12 becomes insufficient, a desired ink outflow amount cannot be obtained, and writing failure such as ink thinning occurs at the time of writing. The strength of the fiber bundle portion increases, and the front ink relay core 10
When the small-diameter distal end portion is inserted, defective assembly such as a seat at the distal end portion is caused. On the other hand, if the porosity exceeds 80%, phenomena such as bleeding at the time of writing due to an increase in the ink supply amount are caused, which is not preferable as the performance of the writing implement. For this reason, in the present invention, by setting the porosity of the rear ink relay core 7 to 60 to 80%, it is easy to insert a small-diameter sharp portion at the rear end of the front ink relay core.

The front end of the front ink relay core 10 is
The pen tip 12 and the front ink relay core 10 are connected to the pen tip 12, and are held by a pen tip holder 13. The nib holder 13 is held by a nib 14 joined to the front end of the barrel 1, and an air hole 11 is provided at a junction between the nib 14 and the nib holder 13.

According to the writing instrument having the ink relay core of the present invention thus configured, the porosity of the fiber bundle relay core is obtained by coating the fiber bundle rear ink relay core 10 with plastic resin. To obtain the optimum ink flow rate 6
Even if it is set to 0 to 80%, it is possible to prevent occurrence of assembly insertion trouble at the time of assembling the automatic machine due to a decrease in strength.

A writing instrument provided with an ink relay core according to the present invention comprises:
Connect the front end of the rear ink relay core made of fiber bundle, which penetrates the ink reservoir and reaches the ink tank, to the rear end of the front ink relay core having an ink flow passage connected to the pen tip In this writing instrument, the porosity of the rear ink relay core made of a fiber bundle is set to 60 to 80%, and the rear ink relay core is covered with a plastic resin. Therefore, other configurations are not particularly limited. However, it can be suitably used for a ball-point pen, a marking pen, and the like.

[0016]

The writing implement provided with the ink relay core according to the present invention is as described above. The rear ink relay core made of a fiber bundle is coated with a plastic resin, and has a porosity of 60 to 80.
%, It can be used without trouble in assembling and inserting at the time of assembling the automatic machine. In addition, by using the rear ink relay core set at 60-80% as high as the porosity, the pen tip and front end can be used. Since the capillary balance between the ink relay core and the rear ink relay core can be optimally designed, the ink flow can be smoothly performed, the writing can be sufficiently performed quickly, and good writing quality can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing an example of a writing instrument provided with an ink relay core of the present invention.

FIG. 2 is a cross-sectional view showing an example of a writing instrument provided with a conventional ink relay core.

[Explanation of symbols]

 A Writing implement 1 Shaft barrel 2 Ink tank 3 Ink reservoir 4 Fourth groove 5 Through groove 6 Center hole 7 Rear ink relay core 8 Rear ink relay core front end 9 Rear ink relay core rear end 10 Front ink relay core 11 Air Hole 12 Pen tip 13 Pen tip holder 14 Tip shaft

Claims (1)

[Claims] An ink reservoir (3) is provided at a rear end of a front ink relay core (10) having an ink flow passage connected to a pen tip (12).
And a porosity of the rear ink relay core 7 made of the fiber bundle is set to 60 to 80% in a writing instrument connected to the front end of the rear ink relay core 7 made of the fiber bundle through which the rear end reaches the ink tank 2. A writing instrument provided with an ink relay core, wherein the rear ink relay core 7 is covered with a plastic resin.