JP3225684B2 - How to fix ink core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink lead made of a fiber bundle, which is used as a pen tip or an ink relay core, for drawing out ink by capillary force, and is used as a pen tip holder, a temporary ink reservoir member, and the like. And a method of welding and fixing the outer body to the outer body with a solvent.

[0002]

2. Description of the Related Art Textile pens, ball pens, small tube writing instruments,
Many fountain pens, brushes, nail colors, and the like, which use an ink core made of a fiber bundle that derives ink by capillary force as a pen tip or an ink relay core, are used.

FIG. 1 shows an example in which an ink guide 1 as a pen tip is inserted into a pen tip holder 2, and FIG. 2 shows an example in which an ink guide 3 as an ink relay core is inserted into a temporary ink storage member 4. As shown respectively, there is a method using a solvent as one method of fixing the ink lead to an outer body made of a synthetic resin such as a pen point holder and a temporary ink reservoir. That is, a method of impregnating the ink core with the solvent of the outer body and dissolving the outer body with the solvent, thereby welding and fixing the ink core inserted into the outer body.

[0004]

Solvents that do not dissolve the ink core are of course selected and used. But,
Ink cores often contain dirt and impurities.
It is also dissolved by the solvent. For example, there is an ink core manufactured by bundling fibers with an adhesive mainly composed of a thermosetting resin, but a small amount of uncured resin remains in this ink core and this is dissolved in a solvent. There is also.

[0005] These dirt and impurities move in the ink core together with the solvent impregnated in the ink core, and are locally concentrated, whereby the ink deriving ability of the ink core may be hindered. For example, if the solvent is impregnated into the rear end of the ink core by dipping or dripping, the dirt and impurities concentrate on the front end of the ink core.

[0006]

Means for Solving the Problems By using a mixed solvent of a good solvent and a poor solvent of the outer body as a solvent, it is possible to leave a good ink deriving ability of the ink core before using the solvent. . That is, according to the present invention, a fiber bundle ink core is impregnated with a solvent of a synthetic resin outer body, and the outer body is melted with the solvent, thereby welding and fixing the outer body and the ink core inserted into the outer body. The gist of the present invention is a method of fixing an ink core using a mixed solvent of a good solvent and a poor solvent for the outer body as the solvent.

Here, the solvent to be used is appropriately selected according to the material type of the outer body and the ink core. For example, if the outer body is AB
When made of S resin and the ink core is made of polyacrylonitrile fiber, as a good solvent, acetone, methyl ethyl ketone, ethyl acetate, trichloroethylene, etc.
Further, as the poor solvent, ethyl alcohol, methyl alcohol, isopropyl alcohol, water and the like are each appropriately selected and used as one kind or a combination of two or more kinds. However, if possible, it is preferable to use a combination of those having a small difference in boiling point and those having a high compatibility. In general, the higher the ratio of good solvent used, the higher the sticking power, and the higher the ratio of poor solvent used, the less the deterioration of the ink lead-out ability of the ink lead. It is preferable to use a good solvent and a poor solvent at an optimal ratio as appropriate according to the shape and size of the solvent, the type of the solvent used, and the temperature conditions at the time of the fixing treatment.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An ink core (made of a 3-denier polyacrylonitrile fiber bundle (bundled with a thermosetting melamine resin adhesive)) in a through hole (inner diameter: about 2 mm) of a temporary ink reservoir member made of ABS resin. Diameter: about 2mm; Space volume: about 60
%) Was inserted. Here, the insertion force is such that it can be pulled out with a load of about 500 g. Rear end 1 of this ink core
For 5mm, let it protrude from the temporary ink reservoir member,
Thereafter, a portion of 5 mm was immersed in a solvent composed of a mixed solution of acetone and ethyl alcohol for 1 second, quickly pulled up, and then left at room temperature.

[0009] Here, with respect to those obtained by changing the use ratio of acetone and ethyl alcohol in the solvent by 10% by weight, the results of an ink lead-out test and the results of the obtained temporary ink reservoir member and the ink guide were obtained. Table 1 shows the results of an ink ejection test after assembling the fixed matter with the core into a writing instrument.

[0010]

[Table 1]

[0011] The values in the table are the number of occurrences of detachment when a 2 kg pull-out load is applied for each 30 samples (extraction test), using a commercially available black aqueous ink, and using a polyacetal pen tip. A so-called resin pen tip is attached so as to be in contact with the ink lead, and when writing at a load of 100 g, a writing angle of 60 °, and a writing speed of 19 cm / sec, writing is impossible (no ink is discharged) and the handwriting is blurred. The number of occurrences (ink ejection test) is shown.

[0012]

Indeed, the above Table 1 shows only one result. For example, if the type of the pen tip is different or the writing conditions are different, the number of the lines that cause the handwriting is different, and For example, a pullout strength of 1 kg may be sufficient. However, as can be seen from Table 1, according to the present invention, when the ink core is welded and fixed to the outer body by using a solvent, the ink has a sufficient fixing force, and the ink is discharged from the ink core. It is possible to sufficiently prevent the performance from deteriorating.

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part showing an example in which an ink guide as a pen tip is inserted into a pen tip holder.

FIG. 2 is a cross-sectional view of an essential part showing an example in which an ink guide as an ink relay core is inserted into a temporary ink reservoir member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ink lead as a pen tip 2 Pen tip holder 3 Ink lead as an ink relay lead 4 Temporary ink reservoir member

Claims (1)

(57) [Claims] 1. An ink core made of a fiber bundle is impregnated with a solvent of a synthetic resin outer body, and the outer body is melted with the solvent, thereby welding and fixing the outer body and the ink core inserted into the outer body. And fixing the ink core using a mixed solvent of a good solvent and a poor solvent for the outer body as the solvent.