JP2002019368A - Pen point for writing brush pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pen point for a writing brush pen, causing the discoloration of ink and better in flexibility as well as elasticity than those of a writing brush pen made of polyester fiber while having the function of the writing brush pen. SOLUTION: The pen point for a writing brush pen is provided with the shape of a porous writing brush pen consisting of a bundled fibrous body while the bundled fibrous body is made of a composite structure of polytrimethylene terephthalate fiber and polyurethane elastomer resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pen tip for a brush pen useful as a substitute for a paintbrush and a brush.

[0002]

2. Description of the Related Art Conventional nibs for brush pens include a nylon nib and a polyester nib. Examples of the nylon nibs are Japanese Utility Model Publication No. 1-111504 and Japanese Patent Laid-Open No. 2-295799. Some are described in the gazette.
By the way, in the case of a nylon nib, the nylon fiber has a low Young's modulus and flexibility, and has good adhesion to the polyurethane elastomer as a binder, so that the elasticity and restoring property of the polyurethane elastomer are further increased, and furthermore, the durability is improved. Since it has good abrasion and durability, it sufficiently exerts functions as a brush pen (stop, splash, sprout, etc.). On the other hand,
Since a specific ink is adsorbed, there is a drawback that the compounded state of the compounded color is disturbed and the original color is lost. The problem of the ink adsorption is determined by the structure of the coloring matter (pigment, dye).
No. 07. In the case of a polyester nib, the polyester fiber is stable with respect to the ink, so that the ink does not discolor, but has a high Young's modulus, poor flexibility, and adhesion to the polyurethane elastomer as a binder. However, there is a drawback that it does not have a function (stop, splash, splatter, etc.) like a nylon nib.

[0003]

An object of the present invention is to provide a brush pen which has no discoloration of ink, has better flexibility and elasticity than a brush pen made of polyester fiber, and has a function as a brush pen. To provide a nib.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a porous nib formed of a bundled fiber, wherein the bundled fiber is a composite of polytrimethylene terephthalate fiber and polyurethane elastomer resin. It is a structure. The polytrimethylene terephthalate fiber (PTT) in the present invention has an appropriate diameter (dt).
The elastomer resin (ER) that functions as a binder for the polytrimethylene terephthalate fiber is a polyurethane elastomer (PU
E), polyester elastomers, nitrile butadiene rubber (NBR), styrene butadiene rubber (SBR), and the like. Among them, polyurethane elastomer (PUE) is most preferable from the viewpoint of water resistance, chemical resistance, and abrasion resistance.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pen tip for a brush pen according to the present invention will be described. The nib is 1.1 to 1 single thread
Polytrimethylene terephthalate fibers of 1.1 dt are bonded to each other with a polyurethane elastomer to form a porous pen tip made of the bundled fiber.

Next, a production example of the pen tip for a brush pen of the present invention will be described. 14.880 single ply polytrimethylene terephthalate fibers of 3.3 dt are bundled, heated and formed into a molding die at a temperature of 210 to 230 ° C. at a drawing speed of 0.26 m / min, and formed into a rod having a diameter of 4 mm. The body is molded, then immersed in a 14% solid polyurethane elastomer resin solution, dried and cured to form a composite rod of polytrimethylene terephthalate fiber and polyurethane elastomer resin, and then cut. -Polished to form a pen tip for a brush pen.

[0007] The pen tip for a brush pen of the present invention (Example) produced as described above was compared and evaluated with a nylon pen tip and a polyester pen tip of a conventional brush pen.
In the table. (1) Discoloration degree for multicolor ink The discoloration degree for multicolor ink was evaluated using a commercially available color brush pen. The color brush pen to be evaluated is
A dye-based aqueous ink was used in yellow, purple, and blue. First, insert the three types of brush nibs shown in Fig. 1 into a commercially available body, leave them sideways at room temperature for one day, perform initial writing by hand, and then leave them in a 50 degree oven for one week. I do. Next, handwriting is performed, and the color of the handwriting of the initial writing is visually checked. As a result, in the nylon brush pen, there is color loss for yellow, purple and blue, and the discoloration is apparent, but for the polyester brush pen and the brush pen equipped with the nib of the present invention, discoloration is seen at all. Did not.

(2) Function as a pen tip for a brush pen In evaluating the function as a brush pen, the above three types of pen tips are assembled into a commercially available body and handwriting is performed to check the feeling of writing and the like. The change in restorability and durability before and after writing was measured with a handy compression tester (KES-G5, manufactured by Kato Tech Co., Ltd.), and the change in shape was observed with a photograph. He wrote 400 letters on the manuscript paper. Restorability: Regarding the resilience (elastic recovery) required as a function of the brush pen, the handy compression tester applies a load to the pen tip at a constant speed until the set load is reached, and then removes the load. It evaluated by measuring the change of the stress at that time. That is, assuming that the work amount when a load is applied to the pen tip is A and the work amount when the load is removed is B, the recoverability is (B / A) × 100.
(%). As a result, as shown in the graph of FIG. 2 (A), the recoverability value of the polyester brush pen is low, whereas the nylon pen and the brush pen incorporating the nib of the present invention are low. Both show high numerical values, and the nib of the present invention is more suitable for brush pens than polyester brush pens. Durability: The strength of the pen tip before and after writing was measured with a handy compression tester and evaluated. The strength of the pen tip is expressed as the amount of work when a load is applied. With a handy tester, the higher the strength of the pen tip, the smaller the value of the work. Is a large value. As a result, as shown in the graph of FIG. 2B, the change in the strength of the pen tip of the polyester brush pen is large, and the change in the strength of the pen tip of the present invention is small in comparison with this. In addition, a photograph of the appearance of the pen tip before and after writing was taken and the change in the shape was compared.The change in shape was larger for the polyester brush pen, whereas the pen tip of the present invention was less. No change is observed, and the pen tip of the present invention is more suitable for brush pens than polyester brush pens. Stoppers, splashes, and cranes: Regarding the ease of writing when writing normally, such as "stoppers, splashes, and raisers," which are necessary for a brush pen, as shown in the table of FIG. It was easier to write than a polyester brush pen.

[0009]

A. Effects of the Invention According to the first aspect, there is no discoloration of the ink, and the flexibility and elasticity are better than the brush pen made of polyester fiber, and the function of the brush pen, that is, "stopper, spring, and rai" is excellent. Therefore, it is suitable as a pen tip for a brush pen.

[Brief description of the drawings]

FIG. 1 is a table showing discoloration test results of a brush pen tip of the present invention and a conventional brush pen tip.

FIG. 2 (A) shows the restorability (elastic recovery property) before and after writing of the brush pen tip of the present invention and the conventional pen tip of the present invention, and FIG. 2 (B) shows the restorability of the brush pen of the present invention. It is a graph which shows the rate of change (durability) of the amount of work between a pen tip and a conventional pen tip for a brush pen, respectively.

FIG. 3 is a table showing test results of “stop, spring, and hail”, which are functions of a brush pen tip of the present invention and a conventional brush pen tip as a brush pen.

Claims (1)

[Claims] 1. A pen nib for a brush pen, wherein the pen nib has a porous nib shape made of a bundled fibrous body, and the bundled fibrous body is a composite structure of a polytrimethylene terephthalate fiber and a polyurethane elastomer resin.