JP2013256085A - Outer member of writing instrument - Google Patents

Outer member of writing instrument Download PDF

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JP2013256085A
JP2013256085A JP2012134439A JP2012134439A JP2013256085A JP 2013256085 A JP2013256085 A JP 2013256085A JP 2012134439 A JP2012134439 A JP 2012134439A JP 2012134439 A JP2012134439 A JP 2012134439A JP 2013256085 A JP2013256085 A JP 2013256085A
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outer member
writing instrument
molding
resin
synthetic resin
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Takashi Murata
崇 村田
Yoshiyuki Endo
好幸 遠藤
Tetsuya Kito
鉄也 鬼頭
Kento Miyamura
健人 宮村
Yumi Maejima
有未 前島
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Mitsubishi Pencil Co Ltd
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Mitsubishi Pencil Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To apply a gradation pattern and a marble pattern that does not easily discolor or peel off to an outer member of a writing instrument formed with the injection molding of the synthetic resin without depending on printing or pasting of a sticker, etc.SOLUTION: An outer member 10 of a writing instrument is formed by sequentially injecting two or more kinds of synthetic resins in a molding die 20 in a partially mixed state. These two or more kinds of synthetic resins are different in colors or heterogeneity, respectively.

Description

本発明は、筆記具の軸筒及びキャップ等、筆記具の外側を構成する部材であって、合成樹脂の射出成形により形成されるものに関する。   The present invention relates to a member constituting the outside of a writing instrument, such as a shaft cylinder and a cap of a writing instrument, which is formed by injection molding of a synthetic resin.

従来、筆記具の外側を構成する部材、たとえば軸筒及びキャップ等は、合成樹脂の射出成形で形成される場合が大部分である。
軸筒のグリップ部分をその他の部分とは異なる材質の合成樹脂を用いたインサート成形により形成することは下記特許文献１及び２にもある通り周知技術である。
このような軸筒などの筆記具の外側部材については、機能面もさることながら、様々な装飾を施すことで商品価値を向上させようとすることもしばしば行われている。たとえば、下記特許文献３では、軸筒の表面に転写印刷を施すことで、軸筒の先端方向へかけて徐々に色彩の濃度が薄くなっていくグラデーション模様を設けることとしている。また、これ以外にも軸筒の表面にステッカーやフィルムを貼付したり、あるいは塗装によってもこのような模様を形成することは可能である。 Conventionally, members constituting the outside of a writing instrument, such as a shaft tube and a cap, are mostly formed by injection molding of synthetic resin.
Forming the grip portion of the shaft tube by insert molding using a synthetic resin made of a material different from other portions is a well-known technique as disclosed in Patent Documents 1 and 2 below.
For the outer member of the writing instrument such as the shaft tube, in addition to the functional aspect, it is often attempted to improve the commercial value by applying various decorations. For example, in Patent Document 3 below, a gradation pattern in which the color density gradually decreases toward the tip of the shaft cylinder is provided by performing transfer printing on the surface of the shaft cylinder. In addition, it is possible to form such a pattern by sticking a sticker or a film on the surface of the shaft tube, or by painting.

特開２００５−１４４７７２号公報Japanese Patent Laid-Open No. 2005-144772 特開２００７−２８３７０３号公報JP 2007-283703 A 特開２００１−１１３８７７号公報JP 2001-113877 A

以上のように、筆記具の外側部材の表面に現れる模様として、上記のようなグラデーション模様や、マーブル模様を施そうとする場合には、印刷、ステッカー等の貼付又は塗装といった二次的加工によってこれを実現する必要があった。しかし、これらは単に外側部材の表面層を構成しているに過ぎないので、筆記具の使用を重ねるごとに摩耗によって退色したり剥離したりして表層面の品質低下が避けられない問題であった。特に、ステッカーやフィルム等の貼付の場合、貼付した端縁がめくれ上がることでその部分が手指に当たり、使用する際に不快感を生じさせることにもなっていた。
また、このような二次的加工に伴うコストが嵩むことに加え、成形後の汚れやゴミの付着などを防ぐための保管方法や取り扱いにも十分配慮する必要もある。そのため、不要品の発生率も高くなり生産性を低下させることにもなっていた。 As described above, when a gradation pattern or a marble pattern as described above is applied as a pattern appearing on the surface of the outer member of the writing instrument, this may be performed by secondary processing such as printing, sticking or painting of a sticker. It was necessary to realize. However, since these merely constitute the surface layer of the outer member, each time the writing instrument is used, it is a problem that the quality of the surface layer is inevitably deteriorated by fading or peeling due to wear. . In particular, in the case of sticking a sticker or a film, the attached edge is turned up, so that the portion hits a finger, causing discomfort during use.
In addition to the increased cost associated with such secondary processing, it is also necessary to give due consideration to storage methods and handling to prevent dirt and dust from adhering after molding. For this reason, the generation rate of unnecessary products is increased and productivity is reduced.

上記のような種々の問題点に鑑み、本発明は、印刷やステッカー等の貼付によらずに、筆記具の外側部材に、容易に退色あるいは剥離しないグラデーション模様やマーブル模様を施すことを課題とする。   In view of the various problems as described above, it is an object of the present invention to provide a gradation pattern or a marble pattern that does not easily fade or peel on the outer member of a writing instrument, regardless of printing or sticking a sticker or the like. .

上記の課題に鑑み、本発明に係る筆記具の外側部材10は、２種類以上の合成樹脂を順に成形金型20内に射出し、部分的に混合せしめた状態で成形したことを特徴とする。
ここで、「外側部材10」とは、軸筒やキャップ等、筆記具の外側を構成する部材をいう。また、「部分的に混合」とは、２種類以上の合成樹脂を不完全に混合させることをいう。このような混合により、転写、塗装、印刷といった二次的加工によらず、成形品としての外側部材10自体にグラデーション模様やマーブル模様が付加されることになる。なお、ここで使用される合成樹脂としては、たとえば、ポリカーボネート樹脂（ＰＣ）、ポリメタクリル酸メチル樹脂（ＰＭＭＡ）、ポリエチレンテレフタレート樹脂（ＰＥＴ）、アクリロニトリルスチレン樹脂（ＡＳ）、ポリプロピレン樹脂（ＰＰ）、ポリエチレン樹脂（ＰＥ）、熱可塑性エラストマー（ＴＰＥ）等があるが、これらは適宜着色されたものを用いてもよいし、また、溶融樹脂に液体又は粉体の顔料を添加することとしてもよい。 In view of the above problems, the outer member 10 of the writing instrument according to the present invention is characterized in that two or more types of synthetic resins are sequentially injected into the molding die 20 and partially molded.
Here, the “outer member 10” refers to a member that forms the outside of the writing instrument, such as a shaft tube or a cap. Further, “partially mixed” means that two or more kinds of synthetic resins are mixed incompletely. By such mixing, a gradation pattern or a marble pattern is added to the outer member 10 itself as a molded product, regardless of secondary processing such as transfer, painting, and printing. In addition, as a synthetic resin used here, for example, polycarbonate resin (PC), polymethyl methacrylate resin (PMMA), polyethylene terephthalate resin (PET), acrylonitrile styrene resin (AS), polypropylene resin (PP), polyethylene There are resins (PE), thermoplastic elastomers (TPE), etc., and these may be appropriately colored, or liquid or powder pigments may be added to the molten resin.

具体的には、本発明に係る筆記具の外側部材10は、一の合成樹脂を一次成形金型21(20)内へ射出して一次成形部11を形成した後、これを二次成形金型22(20)内へ位置させた状態で、他の合成樹脂を該二次成形金型22(20)内へ射出して、一次成形部11を該他の合成樹脂で再溶融させる二色成形又はインサート成形により形成することができる。すなわち、二色成形又はインサート成形において、一次成形と二次成形とで用いる合成樹脂を異なるものとして、一の合成樹脂で形成された一次成形部11を、二次成形で射出される他の合成樹脂の熱により再溶融させ、それによって両合成樹脂を部分的に混合させるものである。
また、本発明に係る筆記具の外側部材10は、一の合成樹脂を成形金型20内へ射出ゲート24を通じて射出した後、同成形金型20内へ同射出ゲート24を通じて他の合成樹脂を射出して、前記一の合成樹脂を前記他の合成樹脂で前記射出ゲート24の反対側へ押し流しつつ両合成樹脂を部分的に混合せしめる混色成形により形成することができる。すなわち、混色成形器においては、複数種類の溶融合成樹脂の流路を切り替えて一の射出ゲート24から成形金型20内のキャビティへ射出することができる。これを利用して、一の合成樹脂を部分的に射出しておいてから、他の合成樹脂をその後に射出することで、先に射出された一の合成樹脂が他の合成樹脂により射出ゲート24の反対側へ押しやられつつ、それら合成樹脂の界面を部分的に融合ないし混合させることができる。このとき、一の合成樹脂と他の合成樹脂との配合割合や、後から射出する他の合成樹脂の射出速度などを調節することで、グラデーション模様やマーブル模様、あるいはこれらの中間的な模様などとすることもできる。 Specifically, the outer member 10 of the writing instrument according to the present invention is formed by injecting one synthetic resin into the primary molding die 21 (20) to form the primary molding portion 11, and then forming the secondary molding die 11. Two-color molding in which another synthetic resin is injected into the secondary molding die 22 (20) in a state where it is positioned inside the 22 (20), and the primary molded portion 11 is re-melted with the other synthetic resin. Or it can form by insert molding. That is, in two-color molding or insert molding, the synthetic resin used in primary molding and secondary molding is different, and the primary molded portion 11 formed of one synthetic resin is injected into another synthetic resin by secondary molding. The resin is remelted by the heat of the resin, whereby both synthetic resins are partially mixed.
The outer member 10 of the writing instrument according to the present invention injects one synthetic resin into the molding die 20 through the injection gate 24 and then injects another synthetic resin into the molding die 20 through the injection gate 24. Then, the one synthetic resin can be formed by color mixture molding in which both synthetic resins are partially mixed while the other synthetic resin is pushed away to the opposite side of the injection gate 24. In other words, in the color mixing molding machine, a plurality of types of molten synthetic resin flow paths can be switched and injected from one injection gate 24 into the cavity in the molding die 20. Utilizing this, after partially injecting one synthetic resin, and then injecting another synthetic resin, one synthetic resin that was injected earlier is injected by another synthetic resin. While being pushed to the opposite side of 24, the interfaces of these synthetic resins can be partially fused or mixed. At this time, by adjusting the blending ratio of one synthetic resin and another synthetic resin, the injection speed of other synthetic resins to be injected later, etc., gradation pattern, marble pattern, or an intermediate pattern between them It can also be.

上記のいずれの場合においても、前記２種類以上の合成樹脂はそれぞれ異色であるようにすることができる。こうすることで、異色の合成樹脂が部分的に混合されて、グラデーション模様やマーブル模様を外側部材10の外観として形成することができる。また、ここでいう合成樹脂は異色であれば、同種類であっても異種類であってもよい。ここで、同種類の場合は、両樹脂の親和性は高く部分的な混合であっても全体としての強度は１種類の合成樹脂の射出成形品とほぼ同等とすることが可能である。なお、ここでいう「色」には、無色透明及び有色透明並びに無色半透明及び有色半透明を含むものとする。
あるいは、上記のいずれの場合においても、前記２種類以上の合成樹脂はそれぞれ異種類であるようにすることもできる。こうすることで、異種類の合成樹脂がグラデーション模様あるいはマーブル模様のように部分的に混合することで、未知の触感を有する外側部材10とすることができる。このとき、使用する合成樹脂は相溶性を有することが望ましいが、十分に溶融し分散するのであればその限りでない。 In any of the above cases, the two or more types of synthetic resins may be different colors. By doing so, synthetic resins of different colors are partially mixed, and a gradation pattern or a marble pattern can be formed as the outer appearance of the outer member 10. Further, the synthetic resin referred to here may be of the same type or different type as long as it has a different color. Here, in the case of the same type, both resins have high affinity, and even if they are partially mixed, the overall strength can be almost equivalent to that of an injection molded product of one type of synthetic resin. The “color” here includes colorless and transparent, colored and transparent, and colorless and translucent and colored and translucent.
Alternatively, in any of the above cases, the two or more types of synthetic resins may be different types. By doing so, it is possible to obtain the outer member 10 having an unknown tactile sensation by partially mixing different kinds of synthetic resins like a gradation pattern or a marble pattern. At this time, it is desirable that the synthetic resin to be used has compatibility, but this is not limited as long as it is sufficiently melted and dispersed.

本発明は、上記のように構成されているので、本発明は、印刷やステッカー等の貼付によらずに、筆記具の外側部材に、容易に退色あるいは剥離しないグラデーション模様やマーブル模様を施すことが可能となる。また、二次的加工によるコスト増や不良品発生率の上昇を抑止し、デザイン面の自由度も高くすることができる。   Since the present invention is configured as described above, the present invention can apply a gradation pattern or a marble pattern that does not easily fade or peel to the outer member of the writing instrument, regardless of printing or sticking a sticker or the like. It becomes possible. Further, it is possible to suppress an increase in cost and an increase in defective product generation rate due to secondary processing, and to increase the degree of freedom in design.

二色成形による筆記具の外側部材の成形工程を模式図にて示す。The shaping | molding process of the outer side member of the writing instrument by two-color shaping | molding is shown with a schematic diagram. 混色成形による筆記具の外側部材の成形工程を模式図にて示す。The shaping | molding process of the outer member of the writing instrument by color mixture shaping | molding is shown with a schematic diagram.

以下、図面を参照しつつ本発明の実施の形態を説明する。
（１）第１の実施の形態（二色成形）
図１は、本発明の第１の実施の形態に係る筆記具の外側部材10の成形工程を模式的に示すものである。本実施の形態では、筆記具の外側部材10は２種類の合成樹脂を用いる二色成形により形成される。
まず、一次成形金型21(20)のキャビティ内に、顔料で着色した、透明樹脂又は不透明樹脂（ＴＰＥ又はＰＥが最適である。）から成る一次射出樹脂12を一次射出ゲート25(24)から射出する。これにより、一次成形金型21(20)のキャビティ内面と、コアピン23表面との間の空間により、一次成形部11が形成される（図１（Ａ））。この一次成形部11を一次成形金型21(20)から外し、コアピン23とともに二次成形金型22(20)のキャビティ内にセットする（図１（Ｂ））。そして、二次成形金型22(20)のキャビティ内面内に、無着色の透明樹脂又は半透明樹脂（ＰＰが最適である。）から成る二次射出樹脂13を二次射出ゲート26(24)から射出する（図１（Ｃ））。このとき、二次射出樹脂13の温度は、一次成形樹脂の融点以上とする。そして、図１（Ｄ）に示すように、二次成形金型22(20)のキャビティは二次射出樹脂13で満たされるが、その間に一次成形部11を形成する一次射出樹脂12が再度溶融しつつ、二次射出ゲート26(24)の反対側へ、二次射出樹脂13とともに移動して行く。この状態で冷却固化させた後、二次成形金型22(20)から筆記具の外側部材10が取り出される。これによって、二次射出ゲート26(24)からその反対側へかけて、一次射出樹脂12の色が徐々に薄まっていくグラデーション模様が、筆記具の外側部材10の実質部分として形成されることとなる。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(1) First embodiment (two-color molding)
FIG. 1 schematically shows a molding process of the outer member 10 of the writing instrument according to the first embodiment of the present invention. In the present embodiment, the outer member 10 of the writing instrument is formed by two-color molding using two types of synthetic resins.
First, a primary injection resin 12 made of a transparent resin or an opaque resin (TPE or PE is optimal) colored with a pigment is injected into the cavity of the primary molding die 21 (20) from the primary injection gate 25 (24). Eject. Thus, the primary molding portion 11 is formed by the space between the cavity inner surface of the primary molding die 21 (20) and the surface of the core pin 23 (FIG. 1A). The primary molding portion 11 is removed from the primary molding die 21 (20) and set together with the core pin 23 in the cavity of the secondary molding die 22 (20) (FIG. 1 (B)). Then, a secondary injection resin 13 made of a non-colored transparent resin or a translucent resin (PP is optimal) is placed in the cavity inner surface of the secondary molding die 22 (20), and the secondary injection gate 26 (24). (FIG. 1C). At this time, the temperature of the secondary injection resin 13 is equal to or higher than the melting point of the primary molding resin. As shown in FIG. 1D, the cavity of the secondary molding die 22 (20) is filled with the secondary injection resin 13, while the primary injection resin 12 forming the primary molding portion 11 is melted again. However, it moves together with the secondary injection resin 13 to the opposite side of the secondary injection gate 26 (24). After cooling and solidifying in this state, the outer member 10 of the writing instrument is taken out from the secondary molding die 22 (20). As a result, a gradation pattern in which the color of the primary injection resin 12 gradually fades from the secondary injection gate 26 (24) to the opposite side is formed as a substantial part of the outer member 10 of the writing instrument. .

なお、本実施の形態では、一次射出ゲート25(24)及び二次射出ゲート26(24)はピンポイントゲートとして図示されているが、ゲートの方式としてはこれに限らず、サブマリンゲート、サイドゲート、フィルムゲート、ダイレクトゲートなど一般的なものが利用可能である。
さらに、二次射出ゲート26(24)の射出口付近に撹拌装置を備えることで、一次射出樹脂12と二次射出樹脂13とをマーブル模様を形成するように混合することも可能である。
また、図１（Ａ）のように形成される一次成形部11をあらかじめ別に形成しておき、図１（Ｂ）に示すような成形金型20内にインサートして二次射出樹脂13を射出するインサート成形によっても、同様にグラデーション模様を有する筆記具の外側部材10を形成することができる。なお、このインサート成形を採用する場合には、成形金型20内のインサート部分に、前記一次成形部11のような成形品をインサートするのではなく、この部分に着色用の液体や粉体を直接インサートする方法も可能である。 In the present embodiment, the primary injection gate 25 (24) and the secondary injection gate 26 (24) are illustrated as pinpoint gates, but the gate system is not limited to this, and the submarine gate and side gate are also illustrated. General materials such as film gates and direct gates can be used.
Furthermore, by providing a stirring device near the injection port of the secondary injection gate 26 (24), the primary injection resin 12 and the secondary injection resin 13 can be mixed so as to form a marble pattern.
Further, a primary molding portion 11 formed as shown in FIG. 1A is formed separately in advance, and inserted into a molding die 20 as shown in FIG. 1B to inject secondary injection resin 13. Similarly, the outer member 10 of the writing instrument having a gradation pattern can be formed by insert molding. When this insert molding is adopted, a colored liquid or powder is not inserted into the insert part in the molding die 20 but a molded product such as the primary molding part 11 is inserted into this part. A direct insertion method is also possible.

（２）第２の実施の形態（混色成形）
図５は、本発明の第２の実施の形態に係る筆記具の外側部材10の成形工程を模式的に示すものである。本実施の形態では、筆記具の外側部材10は２種類の合成樹脂を用いる混色成形により形成される。
まず、図２（Ａ）に示す成形金型20のキャビティ内面とコアピン23との間の空間に、無着色の透明樹脂又は半透明樹脂から成る一次射出樹脂12を射出ゲート24から容積の半分程度射出する（図２（Ｂ））。そして射出装置を切り替え、一次射出樹脂12が固化する前に、今度は顔料で着色した透明樹脂又は半透明樹脂から成る二次射出樹脂13を射出ゲート24から射出する（図２（Ｃ））。そして、図２（Ｄ）に示すように、成形金型20のキャビティが樹脂で満たされる間に、二次射出樹脂13は射出ゲート24から離れるにつれて、一次射出樹脂12により色彩が徐々に薄められて、グラデーション模様が、筆記具の外側部材10の実質部分として形成されることとなる。この状態で冷却固化させた後、成形金型20から筆記具の外側部材10が取り出される。 (2) Second embodiment (color mixing molding)
FIG. 5 schematically shows a molding process of the outer member 10 of the writing instrument according to the second embodiment of the present invention. In the present embodiment, the outer member 10 of the writing instrument is formed by color mixture molding using two types of synthetic resins.
First, in the space between the cavity inner surface of the molding die 20 shown in FIG. 2A and the core pin 23, the primary injection resin 12 made of a non-colored transparent resin or semi-transparent resin is about half the volume from the injection gate 24. Injected (FIG. 2B). Then, the injection device is switched, and before the primary injection resin 12 is solidified, a secondary injection resin 13 made of a transparent resin or a translucent resin colored with a pigment is injected from the injection gate 24 (FIG. 2C). As shown in FIG. 2D, while the cavity of the molding die 20 is filled with the resin, the color of the secondary injection resin 13 is gradually diluted by the primary injection resin 12 as it moves away from the injection gate 24. Thus, the gradation pattern is formed as a substantial part of the outer member 10 of the writing instrument. After cooling and solidifying in this state, the outer member 10 of the writing instrument is taken out from the molding die 20.

なお、上記の一次射出樹脂12と二次射出樹脂13とについては、その射出の順番を逆にすることも可能である。この場合、上記のグラデーションの濃淡も逆となる。
ここで使用する２種類の合成樹脂は同じ種類の樹脂又は相溶性の樹脂であることが望ましいが、両樹脂が互いに溶融し分散可能であれば、全く異なる材質の樹脂でも差し支えない。たとえば、両樹脂をＴＰＥとＰＰとの組み合わせにすることで、デザイン性もさることながら、グリップ機能性も向上させることができる。
また、本実施の形態で使用する合成樹脂の種類は２種類であるが、これに限らず、３種類以上を使用することも可能である。 Note that the order of injection of the primary injection resin 12 and the secondary injection resin 13 can be reversed. In this case, the gradation of the gradation is also reversed.
The two types of synthetic resins used here are desirably the same type of resins or compatible resins, but resins of completely different materials may be used as long as both resins can be melted and dispersed. For example, by combining both resins with TPE and PP, it is possible to improve grip functionality as well as design.
Moreover, although the kind of synthetic resin used by this Embodiment is two types, it is not restricted to this, It is also possible to use three or more types.

なお、本実施の形態では、射出ゲート24はピンポイントゲートとして図示されているが、ゲートの方式としてはこれに限らず、サブマリンゲート、サイドゲート、フィルムゲート、ダイレクトゲートなど一般的なものが利用可能である。
さらに、射出ゲート24の射出口付近に撹拌装置を備えることで、一次射出樹脂12と二次射出樹脂13とをマーブル模様を形成するように混合することも可能である。 In the present embodiment, the injection gate 24 is illustrated as a pinpoint gate, but the gate system is not limited to this, and general gates such as a submarine gate, a side gate, a film gate, and a direct gate are used. Is possible.
Furthermore, by providing a stirring device in the vicinity of the injection port of the injection gate 24, the primary injection resin 12 and the secondary injection resin 13 can be mixed so as to form a marble pattern.

本発明は、筆記具の軸筒及びキャップ等、筆記具の外側を構成する部材であって、合成樹脂の射出成形により形成されるものに利用可能である。   INDUSTRIAL APPLICATION This invention is a member which comprises the outer side of a writing instrument, such as a shaft cylinder and a cap of a writing instrument, Comprising: It can utilize for what is formed by injection molding of a synthetic resin.

10 筆記具の外側部材 11 一次成形部 12 一次射出樹脂
13 二次射出樹脂
20 成形金型 21 一次成形金型 22 二次成形金型
23 コアピン 24 射出ゲート 25 一次射出ゲート
26 二次射出ゲート 10 Writing instrument outer member 11 Primary molded part 12 Primary injection resin
13 Secondary injection resin
20 Mold 21 Primary mold 22 Secondary mold
23 Core pin 24 Injection gate 25 Primary injection gate
26 Secondary injection gate

Claims (5)

２種類以上の合成樹脂を順に成形金型内に射出し、部分的に混合せしめた状態で成形したことを特徴とする筆記具の外側部材。   An outer member of a writing instrument, wherein two or more types of synthetic resins are sequentially injected into a molding die and molded in a partially mixed state. 一の合成樹脂を一次成形金型内へ射出して一次成形部を形成した後、これを二次成形金型内へ位置させた状態で、他の合成樹脂を該二次成形金型内へ射出して、一次成形部を該他の合成樹脂で再溶融させる二色成形又はインサート成形により形成されることを特徴とする請求項１記載の筆記具の外側部材。   After one synthetic resin is injected into the primary molding die to form the primary molding part, the other synthetic resin is put into the secondary molding die in a state where it is positioned in the secondary molding die. The outer member of a writing instrument according to claim 1, wherein the outer member is formed by two-color molding or insert molding in which the primary molded portion is injected and re-melted with the other synthetic resin. 一の合成樹脂を成形金型内へ射出ゲートを通じて射出した後、同成形金型内へ同射出ゲートを通じて他の合成樹脂を射出して、前記一の合成樹脂を前記他の合成樹脂で前記射出ゲートの反対側へ押し流しつつ両合成樹脂を部分的に混合せしめる混色成形により形成されることを特徴とする請求項１記載の筆記具の外側部材。   After one synthetic resin is injected into the molding die through the injection gate, another synthetic resin is injected into the molding die through the injection gate, and the one synthetic resin is injected with the other synthetic resin. 2. The outer member of a writing instrument according to claim 1, wherein the outer member is formed by color mixture molding in which both synthetic resins are partially mixed while being pushed to the opposite side of the gate. 前記２種類以上の合成樹脂はそれぞれ異色であることを特徴とする請求項１、２又は３記載の筆記具の外側部材。   The outer member of a writing instrument according to claim 1, 2 or 3, wherein the two or more types of synthetic resins are different colors. 前記２種類以上の合成樹脂はそれぞれ異種類であることを特徴とする請求項１、２又は３記載の筆記具の外側部材。   The outer member of a writing instrument according to claim 1, 2 or 3, wherein the two or more types of synthetic resins are different types.
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