JP2627077B2 - Core for writing instruments - Google Patents
Core for writing instrumentsInfo
- Publication number
- JP2627077B2 JP2627077B2 JP63218093A JP21809388A JP2627077B2 JP 2627077 B2 JP2627077 B2 JP 2627077B2 JP 63218093 A JP63218093 A JP 63218093A JP 21809388 A JP21809388 A JP 21809388A JP 2627077 B2 JP2627077 B2 JP 2627077B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- pipe
- polyethylene
- shaped molded
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Pens And Brushes (AREA)
Description
【発明の詳細な説明】 (産業上の利用分野) 本発明は折り曲げに対して強度の高い筆記具用中芯に
関するものである。Description: TECHNICAL FIELD The present invention relates to a writing instrument core having high strength against bending.
(従来の技術とその課題) 従来、筆記具用中芯、例えば油性ボールペンの中芯に
用いるパイプ状成形品の材質として、ポリプロピレンが
用いられている。(Prior art and its problems) Conventionally, polypropylene has been used as a material for a pipe-shaped molded product used for a writing instrument core, for example, an oil-based ballpoint pen.
この油性ボールペンの中芯は、硬質の外装軸に挿入
し、用いられるものであるが、カートリッジとして外装
軸に挿入しない状態で保存したり、外装軸がデザインあ
るいは使用上折り曲げられる構造であると、中芯に外よ
りの力が加えられ、折り曲げられる状態になり、従来の
中芯を用いると、特に、低温時において、折り曲げた際
に、中芯のパイプ状成形品座屈や割れが生じ、インキが
漏れる等の問題がある。The core of this oil-based ballpoint pen is inserted into a hard armored shaft and is used.However, if it is stored as a cartridge without being inserted into the armored shaft, or if the armored shaft has a structure that can be bent for design or use, When an external force is applied to the core and the core is bent, using a conventional core, especially at low temperatures, when bent, buckling or cracking of the core-shaped pipe-shaped molded product occurs, There are problems such as ink leakage.
(課題を解決するための手段) 本発明は、上記問題点に鑑みなされたものであり、即
ち、その要旨を、筆記部と、インキを収容したパイプ状
成形品よりなる筆記具用中芯であって、上記パイプ状成
形品の材質が軟質ポリエチレンと硬質ポリエチレンとの
混合物よりなり、軟質ポリエチレンを10重量%以上含む
ことを特徴とする筆記具用中芯とするものである。(Means for Solving the Problems) The present invention has been made in view of the above-mentioned problems. That is, the gist of the present invention is to provide a writing part and a writing instrument core made of a pipe-shaped molded article containing ink. The material for the pipe-shaped molded article is a mixture of soft polyethylene and hard polyethylene, and the soft core contains 10% by weight or more of soft polyethylene.
以下、本発明を更に、詳細に説明する。 Hereinafter, the present invention will be described in more detail.
パイプ状成形品としては、軟質ポリエチレンと硬質ポ
リエチレンとの混合物を使用するが、軟質ポリエチレン
として、具体的には、サンテックM2004(旭化成工業
(株)製)、ウルトゼックス(三井石油化学工業(株)
製)、パトロセン(東洋曹達(株)製)、ハイミラン
(三井ポリケミカル(株)製)等が挙げられ、その使用
量が10重量%以上であるのは、10重量%より少ないと、
効果が得られないためである。As the pipe-shaped molded product, a mixture of soft polyethylene and hard polyethylene is used. Specific examples of the soft polyethylene include Suntech M2004 (manufactured by Asahi Kasei Kogyo Co., Ltd.) and Ultzex (Mitsui Petrochemical Industry Co., Ltd.)
), Patrocene (manufactured by Toyo Soda Co., Ltd.), Himilan (manufactured by Mitsui Polychemicals Co., Ltd.) and the like.
This is because the effect cannot be obtained.
又、硬質ポリエチレンとして、具体的には、サンテッ
ク B870(旭化成工業(株)製)、チッソポリエチ(チ
ッソ(株)製)、ノバテック(三菱化成工業(株)
製)、ニポロンハード(東洋曹達(株)製)等が挙げら
れ、その使用量は、軟質ポリエチレンの使用量が10重量
%以上であるため、90重量%以下となるが、それは、90
重量%より多いと、低温時、折り曲げると、座屈又は割
れが発生し効果が得られないためである。Specific examples of hard polyethylene include Suntec B870 (manufactured by Asahi Kasei Corporation), Chisso Polyeth (manufactured by Chisso Corporation), and Novatec (Mitsubishi Kasei Kogyo Co., Ltd.)
And Nipolon Hard (manufactured by Toyo Soda Co., Ltd.). The amount of soft polyethylene is 90% by weight or less because the amount of soft polyethylene used is 10% by weight or more.
If the amount is more than the weight percentage, buckling or cracking occurs when bent at low temperature, and the effect cannot be obtained.
(作 用) ポリエチレンはポリプロピレンに比べ、胞化温度が低
いため、低温時、折り曲げても、割れにくい。(Action) Polyethylene has a lower foaming temperature than polypropylene, so it is less likely to break when bent at low temperatures.
(実施例) 実施例1 軟質ポリエチレン 10重量部 硬質ポリエチレン 90重量部 上記各成分を混合し、押し出し成形によりパイプ状成
形品を得た。(Examples) Example 1 10 parts by weight of soft polyethylene 90 parts by weight of hard polyethylene The above components were mixed, and extruded to obtain a pipe-shaped molded product.
実施例2 軟質ポリエチレン 50重量部 硬質ポリエチレン 50重量部 上記各成分を混合し、押し出し成形によりパイプ状成
形品を得た。Example 2 50 parts by weight of soft polyethylene 50 parts by weight of hard polyethylene The above components were mixed and extruded to obtain a pipe-shaped molded product.
実施例3 軟質ポリエチレン 25重量部 硬質ポリエチレン 75重量部 上記各成分を混合し、押し出し成形によりパイプ状成
形品を得た。Example 3 25 parts by weight of soft polyethylene 75 parts by weight of hard polyethylene The above components were mixed and extruded to obtain a pipe-shaped molded product.
比較例1 ポリプロピレンのみを使用し、これを押し出し成形に
よりパイプ状成形品を得た。Comparative Example 1 A pipe-like molded product was obtained by extrusion molding using only polypropylene.
比較例2 硬質ポリエチレンのみを使用し、これを押し出し成形
によりパイプ状成形品を得た。Comparative Example 2 Only a hard polyethylene was used and was extruded to obtain a pipe-shaped molded product.
比較例3 軟質ポリエチレンのみを使用し、これを押し出し成形
によりパイプ状成形品を得た。Comparative Example 3 Only soft polyethylene was used and was extruded to obtain a pipe-shaped molded product.
(効 果) 実施例1〜3、比較例1〜3により得られたパイプ状
成形品について、耐屈曲性試験を行なった結果を下表に
示す。(Effects) The results of bending resistance tests performed on the pipe-shaped molded articles obtained in Examples 1 to 3 and Comparative Examples 1 to 3 are shown in the following table.
このように、本発明によると、折り曲げに対して強度
の高い筆記具用中芯が得られるものである。 Thus, according to the present invention, a writing instrument core having high strength against bending can be obtained.
Claims (1)
品よりなる筆記具用中芯であって、上記パイプ状成形品
の材質が軟質ポリエチレンと硬質ポリエチレンとの混合
物よりなり、軟質ポリエチレンを10重量%以上含むこと
を特徴とする筆記具用中芯。1. A writing instrument core comprising a writing section and a pipe-shaped molded article containing ink, wherein the material of the pipe-shaped molded article is a mixture of soft polyethylene and hard polyethylene, and the soft polyethylene is 10 A core for writing implements, characterized in that it contains not less than% by weight.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63218093A JP2627077B2 (en) | 1988-08-31 | 1988-08-31 | Core for writing instruments |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63218093A JP2627077B2 (en) | 1988-08-31 | 1988-08-31 | Core for writing instruments |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0263898A JPH0263898A (en) | 1990-03-05 |
JP2627077B2 true JP2627077B2 (en) | 1997-07-02 |
Family
ID=16714520
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63218093A Expired - Lifetime JP2627077B2 (en) | 1988-08-31 | 1988-08-31 | Core for writing instruments |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2627077B2 (en) |
-
1988
- 1988-08-31 JP JP63218093A patent/JP2627077B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0263898A (en) | 1990-03-05 |
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