JP3319035B2 - How to fix ink core - Google Patents

Abstract

PURPOSE:To enable an ink leading core to be secured positively and also enable ink jetting out to be performed excellently even in the case where there exists a small dispersion in the solvent using quantity or atmosphere during treatment by providing a groove to be a passage for the solvent on the outer body in a manner extending in the insertion direction of ink leading core and leading a solvent into the groove through capillary force. CONSTITUTION:The outer body 1 is a temporary ink reservoir member and including a central bore 2, toothed temporary ink reservoir parts 3, ink slits 4 for connecting temporary ink reservoir parts 3 partially communicated to the central hole 2, and a groove 5 extending over the wall surface overall length of the central hole 2 lying at a 180 deg. opposition side to the ink slits 4. The quality thereof is ABS resin. The ink leading core 7 is made by binding polyacrylonitrile fiber with a thermosetting melamine resin adhesive. Then, this is put vertically to be immersed in acetone within a vessel from the rear end of an arcuate projection 6 of the outer body 1 with the result that acetone runs up promptly along the groove 5 and the outer body is melted and then cured, followed by securing the ink leading core 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pen tip holder which is used as a pen tip or an ink relay core and which is formed of a fiber bundle or an extruded product of a synthetic resin and which draws out ink by capillary force. The present invention relates to a method of fixing to an outer body made of a synthetic resin such as a temporary ink reservoir member with a solvent.

[0002]

2. Description of the Related Art Textile pens, ball pens, small tube writing instruments,
Many ink wicks, such as fountain pens, brushes, and nail colours, which are formed by extruding a fiber bundle or a synthetic resin and which draw out ink by capillary force, are used as a pen tip or an ink relay core.

As one method of fixing the ink guide to an outer body made of a synthetic resin such as a pen tip holder or a temporary ink storage member, there is the above-mentioned method using a solvent. That is, a method in which the outer body is partially melted with a solvent, and the melted material is solidified on the outer wall surface of the ink core to fix the ink core.

[0004]

In order to securely fix the ink core to the outer body, it is necessary to melt the outer body over at least a certain length of the ink core. In particular, in the case where the ink core is made of a general fiber bundle having no outer skin, if the melted outer body part enters the inside of the ink core too much, the ink core becomes too thin. Hinders the ink deriving ability.

A groove serving as a passage for the solvent is provided in the outer body so as to extend in the ink lead insertion direction. The solvent is passed through the groove by capillary force, and the melted material is used for fixing the ink lead. . That is, the present invention relates to a method of dissolving and fixing an ink core to an outer body made of a synthetic resin with a solvent by using a solvent, wherein the outer body is provided with a groove serving as a passage for the solvent by capillary force. The groove is provided so as to extend in the lead insertion direction, and the opening of the groove not in contact with the ink lead is inserted in the groove.
By contacting the medium, the capillary force is applied to this groove
The gist of the present invention is a method for fixing an ink core , wherein a solution dissolved by the solvent is passed through the solvent and used for fixing to the ink core.

Here, the solvent to be used may be appropriately selected depending on the material type of the outer body. As a sole good solvent,
Further, as a combination of a plurality of good solvents, a mixture containing a poor solvent may be further used. For example, if the outer body is AB
When the resin is made of S resin, examples of good solvents include acetone, methyl ethyl ketone, ethyl acetate, and trichloroethylene, and examples of poor solvents include ethyl alcohol-
, Methyl alcohol, isopropyl alcohol, water and the like. As long as a good solvent is used, one or more of these may be appropriately selected and used.

As for the method of providing the groove in the outer body, it is easy to provide the groove in communication with the hole of the outer body into which the ink lead is inserted, but the thinness that can be dissolved by the solvent is provided. If satisfactory, the groove and the hole may be separated by such a thin portion. The direction in which the groove is provided may not be linear as long as it extends in the ink lead insertion direction. For example, it may be provided spirally. Cross-sectional shape, dimensions,
The number and the like are set as appropriate.

For example, when the solvent is dropped into a groove provided in the outer body or when the groove of the outer body is immersed in a container containing the solvent, the solvent quickly moves through the groove extending in the ink lead insertion direction. Street, accumulate in the ditch. The outer body touched by the solvent gradually dissolves into a resin solution, and this resin solution eventually solidifies on the outer wall surface of the ink core, and the ink core is fixed to the outer body. When the ink core is made of a fiber bundle having no outer skin on the outer wall, the resin solution may partially enter the inside of the ink core. However, the effective amount of the resin solution used for fixing the ink core is sufficiently large.

[0009]

【Example】

Embodiments 1 to 3 will be described with reference to FIGS. The outer body 1 is a temporary ink reservoir member, and has an inner hole 2, a temporary ink reservoir portion 3 having a comb-like vertical cross section, an ink slit 4 for partially connecting the temporary ink reservoir portion 3, which partially communicates with the inner hole 2, In addition, a groove 5 is provided over the entire length of the wall surface of the medium hole 2 on the side opposite to the ink slit 4 by 180 °. Here, the meat portion forming the groove 5 is an arc-shaped protruding portion 6 at the rear portion. The material is ABS resin, the inner diameter of the inner hole 2 is about 2 mm, and the depth of the groove 5 is about 0.5 mm.

An ink core 7 made of a fiber bundle was inserted into the outer body 1. The ink guide core 7 is an ink relay core, and is 3 denier.
Of polyacrylonitrile fibers are bound with a thermosetting melamine resin-based adhesive to have a diameter of about 2 mm and a space volume of about 50%. The rear end is located about 5 mm ahead of the arc-shaped protrusion 6 of the outer body 1. The insertion force is such that it can be pulled out with a load of about 500 g.

The ink guide core 7 in the groove 5 is set in a vertical state.
About 3 mm from the rear end of the arc-shaped protruding portion 6 of the outer body 1, which is a portion having an opening not in contact with the above, was immersed in acetone in the container. The time is 0.5 second, 1 second, and 3 seconds (in the order of the examples). Acetone quickly rose and accumulated in the groove 5. afterwards,
It was left at room temperature (dry).

<Comparative Examples 1 to 3> An outer body (temporary ink reservoir member) prepared in exactly the same shape as the outer body 1 in Examples 1 to 3 except that it has no groove 5 was prepared. Except that the ink core 7 was inserted into the outer body in the same manner as in Examples 1 to 3, and was vertically set, and about 3 mm from the rear end of the ink core 7 was immersed in acetone contained in a container. Same as 3.

Table 1 shows the results obtained by examining the reliability of fixing of the ink core 7 and the goodness of ink discharge for the inks obtained in Examples 1 to 3 and Comparative Examples 1 to 3.

[0014]

[Table 1]

The values in the table are the number of occurrences of detachment when a 2 kg pull-out load is applied for each of 30 samples (extraction test), a commercially available black aqueous ink, and a polyacetal pen tip. A so-called resin pen tip is attached so as to be in contact with the ink core 7, and the number of handwriting and the number of handwriting when writing is performed at a load of 100 g, a writing angle of 60 °, and a writing speed of 19 cm / sec. The number of blurring occurrences (ink ejection test) is shown. Here, handwriting faint was intended only for writable objects.

<Embodiment 4> A description will be given with reference to FIGS. The outer body 8 is a pen point holder, and includes a through-hole 9, a large-diameter portion 10 for fitting to a barrel, a medium-diameter portion 11 following the large-diameter portion 10,
It has a small-diameter portion 12 following the middle-diameter portion 11, and a slit-shaped groove 13 provided in the middle-diameter portion 11 and the small-diameter portion 12.
The material is styrene resin, and the inner diameter of the through hole 9 is about 1.5 m
m, the thickness of the middle diameter portion 11 is about 1.5 mm, the thickness of the small diameter portion 12 is about 1 mm, and the width of the groove 13 is about 0.1 mm, which is narrower toward the through hole 9 side.

An ink core 14 produced by extrusion molding was inserted into the outer body 8. The ink lead 14 is a so-called resin pen tip, and is made of polyacetal. The insertion force is such that it can be pulled out with a load of about 100 g.

This is set vertically (the rear end is on the upper side), and the groove 1
Medium-diameter portion 11 in which 3 is open to the outside of outer body 8
A drop of the same weight mixed solution of methyl ethyl ketone and methyl alcohol was attached with a small dropper toward the step between the and the small-diameter portion 12, and then left sufficiently at 20 ° C. (drying).

The one obtained in the above-mentioned Example 4 and the one obtained in the same manner as in Example 4 except that the temperature during standing as a final step was changed to 15 ° C. and 25 ° C. (20 pieces each) Certainty of fixation of the ink lead 14 (the ink lead 1 which is vertically set)
4 was pressed against a desk) and good ink discharge (a fixed amount of the rear end of the ink lead 14 was immersed in a commercially available black aqueous ink).
The ink did not come off and did not adhere to the outer body 8, and showed an ink wicking force equivalent to that of the ink lead 14 alone.

[0020]

As can be seen from the above description, it was found that even if the amount of the solvent used or the atmosphere during the treatment had a little variation, both the certainty of the fixation of the ink core and the good ink deriving ability could be satisfied. The method for fixing an ink core according to the present invention uses an effective amount of a resin solution used for fixing the ink core.
The number can be increased sufficiently, and it is extremely excellent in mass productivity.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an essential part for explaining an embodiment of the present invention.

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

FIG. 3 is a vertical sectional view of a main part for explaining another embodiment of the present invention.

FIG. 4 is a cross-sectional view taken along line BB of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer body (temporary ink reservoir member) 2 Medium hole 3 Temporary ink reservoir part 4 Ink slit 5 Groove 6 Arc-shaped protruding part 7 Ink lead (ink relay core) 8 Outer body (pen tip holder) 9 Through hole 10 Large diameter part 11 Medium diameter part 12 Small diameter part 13 Groove 14 Ink lead (pen tip)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B43K 5/00-8/24

Claims (1)

(57) [Claims] 1. A method of fixing an ink core to a synthetic resin outer body by dissolving the outer body with a solvent, wherein a groove serving as a passage for the solvent by capillary force is formed in the outer body. The groove is provided so as to extend in the insertion direction.
Make sure that the openings that do not come into contact with
With this, the solvent is passed through this groove by capillary force,
A method for fixing an ink core, wherein the material dissolved by the solvent is used for fixing the ink core.