JP2013091297A - Writing instrument pen and writing instrument using the same - Google Patents

Abstract

There is provided a pen for a writing instrument in which a fiber converging body is processed with a resin, and the pen body for a writing instrument that prevents ink dropout while ensuring a sufficient ink flow rate is provided.
A writing instrument pen body is constituted by a first fiber processed body and a second fiber processed body. The second fiber processed body is inserted into a hollow portion formed in the rear part of the first fiber processed body. The ratio of the total length of the first fiber processed body and the total length of the second fiber processed body is set to a range of 10: 1 to 10: 5. The ratio of the cross-sectional area of the ink storage member connecting portion 6 of the first fiber processed body to the cross-sectional area of the second fiber processed body is set to a range of 10: 1 to 10: 5. The ratio of the porosity of the first fiber processed body and the porosity of the second fiber processed body is set in the range of 10: 4 to 10: 8.
[Selection] Figure 3

Description

  The present invention relates to a pen for a writing instrument and a writing instrument using the pen. Specifically, the present invention relates to a writing instrument pen body in which a fiber converging body is resin-processed and a writing instrument in which the pen body is mounted and an ink occlusion body that can be impregnated with ink is accommodated in a shaft cylinder.

  Conventionally, Patent Document 1 discloses a pen body in which a fiber converging body is processed with resin and the tip is ground into a shell shape. Patent Document 2 discloses a pen for a writing instrument having a double structure composed of a first forming part of a pen core (the pen body of the present application) made of a first fiber and a second forming part of a pen core made of a second fiber. The above is disclosed.

Japanese Utility Model Publication No. 64-52790 JP 2000-135887 A

A pen body in which fibers are processed with resin, so-called fiber pen, is usually applied to sign pens and marking pens with middle to bold letters. The pen body used for such middle and bold pens is required to have a large ink flow rate. In order to increase the ink flow rate, a high-porosity (low fiber density) pen body may be used. However, the ink holding power decreases due to the low fiber density, and the writing instrument is in an inverted state (the pen body downward). If left unattended, there was a tendency for the ink to drop spontaneously (hereinafter referred to as “bottom drop”).
The pen body described in Patent Document 1 has a constant porosity throughout. Increasing the porosity for the purpose of increasing the ink flow rate tends to cause ink spilling. If the porosity is set to be small to prevent ink spilling, the ink flow rate tends to decrease and problems such as writing smearing tend to occur.
The nib described in Patent Document 2 is also a fiber pen in which fibers are resin-processed and the tip is ground into a bullet shape, but has a double structure using fibers made of different materials at the center and the outer periphery. It is a feature.

The pen body for a writing instrument of the present invention contains an ink occluding body that can be impregnated with ink inside a shaft cylinder, and a pen used for a writing instrument in which the rear end portion of the pen body is pierced and connected to the front end portion of the ink occluding body. A pen body is formed by inserting a second fiber processed body into a rear end portion of the first fiber processed body, and a front end of the second fiber processed body is formed of the first fiber processed body. It is required that the rear end is located behind the front end and is exposed from the rear end of the first fiber processed body.
Further, the ratio of the total length of the first fiber processed body and the total length of the second fiber processed body is in the range of 10: 1 to 10: 5, the ink occlusion body connecting portion of the first fiber processed body The ratio of the cross-sectional area of the second fiber processed body to the cross-sectional area of the second fiber processed body is in the range of 10: 1 to 10: 5, and the porosity of the first fiber processed body and the second fiber processed body The requirement is that the porosity ratio is in the range of 10: 4 to 10: 8.
Furthermore, it is a writing instrument equipped with the writing instrument pen body, and the contact length between the writing instrument pen body and the ink occlusion body is longer than the total length of the second fiber processed body.

The pen for a writing instrument used in the writing instrument of the present invention is the above-described defect of the fiber pen configured with the uniform porosity described in Patent Document 1, that is, the dropping phenomenon when the ink flow rate is increased, Both satisfy the conflicting performance of reducing the ink flow rate when dropping is prevented.
That is, in the pen body in which the second fiber processed body is inserted into the hollow portion provided at the rear end portion of the first fiber processed body, the porosity of the first fiber processed body is different from the porosity of the second fiber processed body. A sufficient ink flow rate can be secured without reducing the ink holding power.

The pen body described in Patent Document 2 has a double structure including a pen core first forming portion at the center and a pen core second forming portion at the outer peripheral portion (first embodiment). The pen body of this embodiment has a double structure over its entire length, and the tip ground to a bullet shape protrudes from the pen core first forming portion and slightly behind the outer periphery of the pen core second forming portion. It becomes the structure where the part is located.
Thus, since the writing part of the pen body has a double structure, the joint part between the pen core first forming part and the pen core second forming part gradually peels off as writing is performed.
On the other hand, the pen body used in the writing instrument of the present invention has a uniform writing portion, and there is no problem as in the prior art.

It is a partial longitudinal cross-sectional view of the 1st fiber processed body of the pen body of this invention. It is a side view of the 2nd fiber processed body of the pen body of this invention. It is a partial longitudinal cross-sectional view of the pen body of this invention. It is AA sectional drawing of the pen body of this invention. It is a partial longitudinal cross-sectional view of the writing instrument of this invention. It is a partial longitudinal cross-sectional view of the pen body of a comparative example.

  The pen body of the present invention comprises a first fiber processed body and a second fiber processed body. The first and second fiber processed bodies are obtained by fixing a fiber bundle made of synthetic resin with a binder resin. Examples of the synthetic resin fibers include polyester fibers, acrylic fibers, and nylon fibers. The binder resins include, for example, polyurethane resins, melamine resins, epoxy resins, phenol resins, polyester resins, urea resins, xylene resins, and the like. Is mentioned.

The first and second fiber processed bodies are formed into rod-shaped resin processed bodies by passing the fiber converging body through a heat die to define the outer diameter, passing the solution through a binder resin solution, and then evaporating the solution with a drying device. Create The second fiber processed body cuts the rod-shaped resin processed body into a predetermined length. In the first fiber processed body, a rod-shaped resin processed body obtained in the same process as the second fiber processed body is formed into a predetermined shape by a grinding machine, and then a hollow portion is formed in the rear portion.
The pen body of the present invention is obtained by inserting the second fiber processed body into the hollow portion of the first fiber processed body.
The fiber material used in the first fiber processed body and the second fiber processed body may be the same or different materials.

In the pen body of the present invention, the ratio of the total length of the first fiber processed body and the total length of the second fiber processed body is set in a range of 10: 1 to 10: 5. The above-mentioned range is preferable for the total length ratio, but a range of 10: 2 to 10: 4 is more preferable.
The ratio of the cross-sectional area of the first fiber processed body and the cross-sectional area of the second fiber processed body in the shaft tube fitting portion of the pen body of the present invention is preferably in the range of 10: 1 to 10: 5. . The cross-sectional area ratio is preferably in the above range, but more preferably in the range of 10: 2 to 10: 4.

In the pen body of the present invention, the porosity of the second fiber processed body is set smaller than that of the first fiber processed body. When the writing instrument of the present invention is left in an inverted state, the second fiber processed body exhibits an ink holding effect and prevents ink spillage.
The porosity ratio of the first fiber processed body and the second fiber processed body is preferably in the range of 10: 4 to 10: 8.
The porosity of the fiber processed body is measured by the following procedure.
The weight (m) of the fiber processed body is measured.
The apparent volume (V) of the fiber processed body is measured.
The fiber processed body is impregnated with a liquid having a known density (ρ), and the weight (M) of the fiber processed body impregnated with the liquid is measured.
The porosity is calculated by the following formula.
[(M−m) ÷ ρ] ÷ V × 100 = porosity (%)

An embodiment of a pen for a writing instrument of the present invention is shown in FIGS.
Both the first fiber processed body 3 and the second fiber processed body 4 used in the writing instrument pen body 1 of the present embodiment are formed by processing polyester fibers with melamine resin.
The first fiber processed body 3 is obtained by resin-processing a fiber bundle, grinding the tip of a rod-shaped body cut into an appropriate length into a shell shape, and rearwardly reducing the diameter of the two-stage diameter-reduced portion (shaft tube fitting portion 5 and ink). After forming the occlusion body contact part 6), a hollow part 7 was provided at the rear part. The second fiber processed body 4 is obtained by processing a polyester fiber with a melamine resin and cutting it into a predetermined length.

The total length (L1) of the first fiber processed body 3 is 30 mm, the total length (L2) of the second fiber processed body 4 is 5 mm, and the total length ratio of both is 10: 1.6.
The ratio of the cross-sectional area of the ink storage body contact portion 6 of the first fiber processed body 3 to the cross-sectional area of the second fiber processed body 4 is 10: 4.6.
Further, the porosity of the first fiber processed body 3 is 65%, the porosity of the second fiber processed body 4 is 40%, and the ratio of both is 10: 6.1.
The contact length (L3) of the first fiber processed body 3 with the ink occluding body 9 is 7.5 mm, and is set to be larger than 5 mm of the total length (L2) of the second fiber processed body 4.
The pen body of the comparative example is obtained by omitting the step of forming the hollow portion 7 of the first fiber processed body 3.

Ink spill test The pens of Examples and Comparative Examples were each attached to a shaft cylinder containing an ink occlusion body, and 10 g each of 1.7 g of water-based ink and 1.8 g of water were injected, The following test was conducted with the cap attached.
The writing implements of the examples and comparative examples were taken out after standing for 5 hours in an inverted (pen body downward) environment at 50 ° C., left to cool in a horizontal position, the cap was removed, and the pen body portion and the inside of the cap were visually observed. Observed at.
The test results are shown in the following table.

The criteria for evaluation in the table are as follows.
○: No ink drop was observed.
Δ: Ink leaked from the pen body and accumulated in the pen body portion.
X: Ink leaked from the pen body and dropped into the cap.

DESCRIPTION OF SYMBOLS 1 Writing instrument pen body 2 Writing instrument 3 1st fiber processed body 4 2nd fiber processed body 5 Shaft cylinder fitting part 6 Ink occlusion body contact part 7 Hollow part 8 Shaft cylinder 9 Ink occlusion body

Claims (5)

  A pen body used for a writing instrument in which an ink storage body that can be impregnated with ink is accommodated in a shaft cylinder, and a rear end portion of the pen body is pierced and connected to a front end portion of the ink storage body, The second fiber processed body is inserted into the rear end portion of the first fiber processed body, and the front end of the second fiber processed body is located behind the front end of the first fiber processed body, and the rear end Is exposed from the rear end of the first textile processed body.   2. The writing instrument pen body according to claim 1, wherein a ratio of a total length of the first fiber processed body and a total length of the second fiber processed body is in a range of 10: 1 to 10: 5.   The ratio of the cross-sectional area of the ink occlusion body connecting portion of the first fiber processed body and the cross-sectional area of the second fiber processed body is in the range of 10: 1 to 10: 5. 2. A pen body for a writing instrument according to 2.   The ratio between the porosity of the first fiber processed body and the porosity of the second fiber processed body is in the range of 10: 4 to 10: 8. Pen body for writing instruments.   A writing instrument equipped with the pen body for a writing instrument according to claim 1, wherein a contact length between the pen body and the ink occlusion body is greater than a total length of the second fiber processed body. Writing instrument to do.

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