JPH0331582Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a writing instrument that uses water-based ink, and particularly to a writing instrument that uses water-based ink and is equipped with an ink reservoir and supply body that has high writing efficiency and is inexpensive to manufacture. be.

(Prior art) Conventionally, ink storage and supply bodies loaded into cylinders in writing instruments such as ballpoint pens, felt-tip pens, and calligraphy pens that use this type of water-based ink have been made by bundling Tetoron fibers in a rod shape aligned in the axial direction. The periphery of the object was covered with vinyl chloride resin, and a so-called batting made by cutting this into a predetermined length was inserted into the cylinder, and the batting was impregnated with ink.

(Problems to be solved by the invention) In the conventional ink reservoir and supply body, the ink filled in the filling is sequentially sent out toward the tip of the writing instrument by capillary action during writing, but the ink As soon as the consumption reaches the middle of the batting, the ink flow becomes slow and the so-called writing efficiency of the ink decreases. In addition, the process of manufacturing the ink reservoir and supply body requires a complicated process of first bundling the fibers and then wrapping and fixing a vinyl chloride resin film around the fibers, resulting in high costs. It was hot. This invention solves these problems and provides a writing instrument equipped with a water-based ink reservoir and supply body that has high ink absorption and retention properties, good ink followability and writing efficiency, and is inexpensive to manufacture. It was developed for this purpose.

(Means for Solving the Problems) In order to solve the above problems, this invention forms the ink storage and supply body as a rod-shaped body using a polyurethane resin that has high ink absorption and retention properties and a high open cell ratio. did. Furthermore, during the formation process, a water-impermeable film layer was formed on the circumferential surface of the rod-shaped body by molding, integrally with the core. The ink reservoir and supply body made of a rod-shaped body constructed in this manner was mounted inside the cylinder of a writing instrument.

(Function) This device configured as described above has the following functions.

Since the ink storage supply body is a rod-shaped body made of foamed resin having open cells, it can absorb water-based ink from one longitudinal end. When the rod-shaped body is molded, no open cells are formed on the outer peripheral surface of the rod-shaped body that was in contact with the inner peripheral surface of the mold, and a continuous film of resin is formed, so that a film is formed on the outer peripheral surface of the rod-shaped body. Since the coating is water-impermeable, the water-based ink contained therein does not leak onto the circumferential surface of the rod-shaped body. However, with conventional fiber bundles, capillary action does not occur unless the fibers are in contact with each other, so the ink absorption capacity is small, but the rod-shaped body in this invention is hollow with many open cells, so the amount of ink absorption is extremely low. There are many Also,
The fiber bundle allows ink to flow in the vertical direction, so when there is a large amount of ink, the ink flows well, but when the amount of ink is small, the flow deteriorates. The ink travels evenly through the air bubbles, resulting in excellent retention.

(Example) An example of this invention will be described based on the drawings.
FIG. 1 is an exploded longitudinal sectional front view of a writing instrument using water-based ink (hereinafter referred to as a writing instrument), and FIG. 2 is a perspective view of an ink reservoir and supply body.

The cylinder 1A of the writing instrument 1 is a general plastic cylinder, and an ink reservoir and supply body 2 is installed inside it, a tip member 6 is installed at the tip end, and a tail plug 12 is installed at the base end. The tip member 6 is suitable for ballpoint pens (Fig. 1), felt-tip pens (Fig. 3), and brush pens (Fig. 4).
It can be changed as follows.

The tip member 6 in FIG. 1 has a ball holding tube 8 fitted to the tip of the base tube body 6A.
A ball 7 is held at the tip. Further, an ink introduction shaft (acrylic fiber bundle) 9 is fitted into the ball holding tube 8 toward the rear of the base tube body 6A. Thus, when the base tube body 6A is fitted to the tip of the cylinder 1A, the tip of the ink introduction shaft 9 is inserted into the ink reservoir supply body 2 and connected thereto.

The ink storage and supply body 2 is formed into a rod-shaped body 3 made of polyurethane resin that has high ink absorption and retention properties and a high open cell ratio, and has an open cell interior and an impermeable film layer 4 on the outer periphery. are integrally formed by molding. When one longitudinal end of the rod-shaped body 3 is then immersed in water-based ink, the ink 5 permeates into the rod-shaped body 3 and is held in open cells. This ink 5 is transmitted through the ink introduction shaft 9 by capillary action and reaches the ball 7.

Since there are many methods for manufacturing the ink reservoir supply body 2, one example will be shown below.

For example, a polyurethane foam board that has been expanded to a predetermined ratio is cut into rod-shaped bodies of a predetermined thickness, and the cut foam is placed in upper and lower heat-pressing molds (not shown) that are opposed to each other and have continuous semicircular grooves. A rod-shaped body 3 can be obtained by clamping and clamping the rod-shaped body 3. The rod-shaped body 3 uses the foam board as a material,
By compressing it with a hot press mold, the outer peripheral surface is thermally melted, the open cells disappear, and a water-impermeable continuous film is formed. In addition, when housing a rod-shaped foam in a hot-pressing mold, a different kind of resin, such as vinyl chloride, is placed around the mold and compressed, so that a different kind of coating is integrated on the circumferential surface of the rod-shaped body 3 by molding. can be formed.

Another method is to pump the foamable polyurethane resin liquid prepared by mixing and stirring the main raw materials and auxiliary raw materials into a mold having a through-hole with a nozzle, foam it in the mold, and continuously draw it out. , long rod-shaped bodies can be molded. Since the outer circumferential surface of this rod-shaped body was in contact with the inner circumferential surface of the mold, no bubble spaces were created on the circumferential surface even if foaming action occurred within the mold, and a continuous film was formed. That is, since a water-impermeable film is formed on the outer circumferential surface in a single step at the same time as the rod-shaped body is molded with a metal mold, the manufacturing cost is significantly lower than in the above example. When forming a dissimilar resin film using this method, a nozzle having an annular opening is applied to the cavity of the mold, a normal nozzle is arranged in the center of the annular opening of the nozzle having an annular opening, and the annular opening nozzle is placed in the center of the annular opening of the nozzle. When PVC resin and foamed polyurethane resin are simultaneously discharged from a normal nozzle to form a rod-shaped body in a mold and continuously drawn out, the core is made of open-cell foamed polyurethane and the circumferential surface is made of vinyl chloride, which is water-impermeable. A rod-shaped body 3 of a sexual film 4 is formed. Therefore, these long rod-like bodies are called cylindrical body 1.
By cutting it to match the length of A, the water-based ink storage supply body 2 can be obtained easily and inexpensively.

As described above, the foamed polyurethane rod-shaped body 3 having continuous foaming has excellent absorbency and retention of water-based ink, and the film 4 has the effect of preventing leakage of water-based ink, and even a film can be formed in the molding process.
This has the effect of reducing manufacturing costs.

FIG. 3 shows a tip member 6 for a felt-tip pen, and numeral 10 is a felt-tip pen shaft.

FIG. 4 shows a tip member 6 for a brush pen, and the reference numeral 1
1 is the top of the hair.

(Effects of the invention) Since this invention is constructed as described above, it has many excellent effects as described below.

(1) Since the ink reservoir and supply body is constructed as a rod-shaped body of foamed polyurethane resin with continuous foaming,
Excellent water absorption and retention of water-based inks.

(2) Since a water-impermeable film is integrally formed on the outer peripheral surface of the rod-shaped body by molding, manufacturing costs can be significantly reduced, and the film has a beautiful appearance, creating an ink reservoir and supply body that does not leak ink. Obtainable.

(3) Since the ink is stored in the continuous foam cavities of the rod-shaped body, the amount of ink stored can be increased relative to the volume.

(4) Since the ink is stored in continuous foam cavities, as the ink is consumed, air and capillary action repeat the effect that if a cavity is formed at the bottom, the ink at the top falls down, resulting in a large amount of ink. No matter how little or how much ink you use, the ink comes out evenly and you can write smoothly.

[Brief explanation of the drawing]

The drawings relate to an embodiment of this invention, and FIG. 1 is a longitudinal sectional front view of a writing instrument using water-based ink in an exploded state, and FIG.
The figure is a perspective view of the ink storage supply body, FIG. 3 is a sectional view showing an example in which the tip member of a writing instrument is used for a felt-tip pen, and FIG. 4 is a sectional view showing an example in which the tip member of a writing instrument is used for a brush pen. . 1... Writing instrument using water-based ink, 1A... Cylindrical body,
2... Ink storage supply body, 3... Rod-shaped body, 4...
Water-impermeable film, 5... ink, 6... tip member,
7...Ball, 9...Ink introduction shaft, 10...Felt pen shaft, 11...Brush head, 12...Tail plug.

Claims (1)

[Scope of utility model registration request] An ink storage and supply body formed of a rod-shaped body made of a polyurethane resin with high ink absorption and retention properties and a high open cell rate, and a water-impermeable film integrally formed on the circumferential surface of the rod-shaped body by molding. A writing instrument using water-based ink, which is made by attaching the inside of the writing instrument's cylindrical body.