JP2000141980A - Barrel of writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To seduce the suction of dust and thereby prevent a gripping member from fouling by forming the gripping member formed in rubber or a thermoplastic elastomer in a gripping part, of the material kneaded with an antistatic resin. SOLUTION: The transparent barrel body 2 of a knocking-type ball-point pen barrel 1 is formed of an acrylonitrile/styrene resin (AS resin). Next the gripping part 3 of the barrel body 2 is formed to be of a small outside dia. and the yellow gripping member 4 of the gripping part 3 is formed in two colors. The gripping member 4 is formed in two colors using a material obtained by adding 20 wt.% pelletized antistatic resin to a thermoplastic elastomer of an olefin resin. In addition, a recessed groove 6 formed in the shape of a ring for antiskid is provided on the surface 5 of the gripping member 4. The gripping member 4 has the effect to attenuate static electricity charged to the gripping member 4 as it is made of the material kneaded with the antistatic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft barrel of a writing instrument in which a grip portion is provided with a grip member formed of rubber or a thermoplastic elastomer.

[0002]

2. Description of the Related Art In recent years, a barrel for writing is generally provided with a grip member formed of rubber or a thermoplastic elastomer at a grip portion to prevent slippage. Also,
As such a barrel of a writing instrument, a barrel of a writing instrument in which the grip member is formed by two-color molding is also known.

[0003]

Conventionally, when a writing implement composed of a shaft cylinder having a gripping member provided on a grip portion is inserted and displayed in a display container or the like, dust or the like adheres to the gripping member, and the gripping member is displaced. There was a problem of getting dirty. For this reason, there has been a problem that even if the grip member is molded in a vivid color, the color becomes dull later. On the surface,
For grip members that have knurling, a matte surface, or a ring-shaped concave groove, and that have an uneven portion on the surface, dust etc. enters the concave portion and adheres. It is easy to get dirty, and the above-mentioned problem appears remarkably.

In the case where the grip member is provided by two-color molding, the grip member is not replaced by a new grip member because the grip member becomes dirty, and cannot be easily replaced. If it gets dirty, it will remain dirty, and further measures for preventing the grip member from becoming dirty are required.
In addition, it has been known that the grip member formed of silicone rubber is difficult to be stained conventionally.
It is one hand to form the grip member with silicone rubber in order to make the grip member less likely to become dirty. However, when the grip member is provided by two-color molding,
In order to perform two-color molding using silicone rubber, a molding machine corresponding to the two-color molding is required, and the molding machine cannot be easily adopted. Antifouling measures have become a more important issue to be solved.

In view of the above, it is an object of the present invention to provide a shaft barrel of a writing instrument in which a grip member made of rubber or a thermoplastic elastomer is provided at a grip portion, so that the grip member is less likely to be stained by dust or the like. It is. Generally, the fact that a member such as a grip member is soiled with dust or the like is due to the fact that dust or the like adheres to the member due to static electricity generated on the surface of the grip member. Accordingly, the present invention has been focused on reducing the adhesion of dust to the grip member by attenuating the static electricity, and reached the present invention.

[0006]

According to the present invention, there is provided a shaft barrel of a writing instrument having a grip member formed of rubber or a thermoplastic elastomer at a grip portion, wherein the grip member is formed by kneading an antistatic resin. Is what you do.

The grip member may be formed by kneading an antistatic resin in a barrel of a writing implement provided by two-color molding.

[0008] In a shaft barrel of a writing instrument having an uneven portion on the surface of the grip member, the grip member is formed by kneading an antistatic resin.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A rubber or thermoplastic elastomer, which is a material of a grip member to be inserted into a grip portion of a barrel of a writing instrument such as a ball-point pen, a mechanical pencil, or a marking pen, matches the rubber or the thermoplastic elastomer. A quantity of pellet-shaped antistatic resin is melt-kneaded in a blender or the like to form pellets. At this time, if necessary, a pigment is appropriately added according to a desired color of the grip member. Using the pellets, a grip member is formed by an injection molding machine, and the grip member is disposed on a grip portion of the barrel of the writing implement to obtain a barrel of the writing implement of the present invention.

[0010] The grip member is formed of rubber or a thermoplastic elastomer, but the type thereof is not particularly limited. The antistatic resin is also not particularly limited as long as it can be kneaded with rubber or a thermoplastic elastomer.
Trade name: Perestat 3170 (manufactured by Sanyo Chemical Industries, Ltd.), trade name: Maxroy (manufactured by Nippon Synthetic Rubber Co., Ltd.)
Etc. Regarding the compounding amount of the antistatic resin, an appropriate compounding amount is appropriately determined according to the material of the rubber or the thermoplastic elastomer of the grip member.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described. In the present embodiment, the barrel 1 of a knock-type ballpoint pen will be described for convenience, but the present invention is not limited to these embodiments.
In the barrel 1 of the knock-type ballpoint pen according to the present embodiment, first, a transparent barrel body 2 is formed of ethylene nitrile styrene resin (AS resin). The outer diameter of the grip portion 3 of the barrel body 2 is formed to be small. The grip portion 3 is formed by molding a yellow grip member in two colors. The grip member is an olefin resin manufactured by AES Japan Co., Ltd. trade name: thermoplastic elastomer of Santoprene, pellet type trade name: Pelestat 3170 (Manufactured by Sanyo Chemical Industries, Ltd.)
Two-color molding is performed using a resin containing 20% by weight of an antistatic resin (not shown). The surface 5 of the grip member 4 is provided with a non-slip concave groove 6 formed in a ring shape.

[0012]

According to the present invention, since the grip member is formed by kneading the antistatic resin, the static electricity charged on the grip member is attenuated, so that the suction of dust can be reduced and the grip member can be reduced. Could be hardly stained.

Further, since the present invention is to form the grip member by mixing an antistatic resin, it differs from the means of applying an antistatic agent to the surface of the grip member,
The antistatic agent does not mix with the ink contained in the barrel and adversely affect the ink.

[Brief description of the drawings]

FIG. 1 is a view showing a main part of a barrel of a writing instrument having a partial cross section, showing an embodiment of the present invention.

Claims (3)

[Claims] 1. A shaft barrel of a writing implement having a grip portion provided with a grip member formed of rubber or a thermoplastic elastomer, wherein the grip member is formed by kneading an antistatic resin. 2. A writing instrument barrel according to claim 1, wherein said grip member is formed by two-color molding. 3. The shaft cylinder of a writing instrument according to claim 1, wherein the grip member has an uneven portion on a surface.