JPH1119969A - Method for injection-integrating soft resin into periphery of cylindrical molding - Google Patents

Method for injection-integrating soft resin into periphery of cylindrical molding

Info

Publication number
JPH1119969A
JPH1119969A JP18906997A JP18906997A JPH1119969A JP H1119969 A JPH1119969 A JP H1119969A JP 18906997 A JP18906997 A JP 18906997A JP 18906997 A JP18906997 A JP 18906997A JP H1119969 A JPH1119969 A JP H1119969A
Authority
JP
Japan
Prior art keywords
hole
molded product
core pin
resin
mold
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.)
Pending
Application number
JP18906997A
Other languages
Japanese (ja)
Inventor
Terumasa Osaki
輝正 大崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pentel Co Ltd
Original Assignee
Pentel Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pentel Co Ltd filed Critical Pentel Co Ltd
Priority to JP18906997A priority Critical patent/JPH1119969A/en
Publication of JPH1119969A publication Critical patent/JPH1119969A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1676—Making multilayered or multicoloured articles using a soft material and a rigid material, e.g. making articles with a sealing part

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent a secondary molding from being peeled off from a primary molding to be stuck to a mold by a method in which a space part having a part which is protruded outside from a through hole, and the secondary molding is formed by injecting a resin into a ring-shaped recessed part, and the resin is introduced into the space part to form an extraction stopping part in the secondary molding. SOLUTION: With primary molding finished, a through hole 3 is formed by a butt pin. In this state, when a core pin 4 is extracted a little, a space part the width of which is wider than that of the through hole 3 is formed on the lower surface of the through hole 3. Next, when a soft resin such as rubber or an elastomer and others is introduced into a ring-shaped recessed part, a secondary molding 9 is formed, and since the small diameter cylinder part 6 of the core pin 4 is contacted with the lower surface of the space part, an extraction stopping part 9a is formed. Besides, the butt pin may be different from a mold and can be formed as a projection in the mold itself. The integration is ensured by an extraction stopping part, surely preventing dislocation, stripping and peeling to be left in the mold in releasing.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、円筒状の１次成形
品（ボールペン軸筒）の所定位置外周にゴムやエラスト
マー等の軟質樹脂を射出して２次成形品を形成し、該２
次成形品が１次成形品より抜け出ないようにした円筒状
成形品外周に軟質樹脂を射出一体化する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary molded article formed by injecting a soft resin such as rubber or elastomer around a predetermined position of a cylindrical primary molded article (ballpoint pen barrel).
The present invention relates to a method for injecting and integrating a soft resin around the outer periphery of a cylindrical molded product so that the next molded product does not come off from the primary molded product.

【０００２】[0002]

【従来の技術】従来、ボールペン軸のような円筒状の１
次成形品の外周にゴムやエラストマー等の軟質樹脂を射
出してボールペン軸にゴムグリップを一体化したものは
公知である。2. Description of the Related Art Conventionally, a cylindrical one such as a ballpoint pen shaft is used.
It is known to inject a soft resin such as rubber or elastomer onto the outer periphery of the next molded product and integrate a rubber grip with a ballpoint pen shaft.

【０００３】[0003]

【発明が解決しようとする課題】上記従来技術は離型す
る際、２次成形品が１次成形品より剥がれて金型にくっ
つき残ってしまい、又、ペンとして長期間使用するとエ
ラストマーが汗により膨潤してずれたり、めくれたりす
るという問題点があった。In the above prior art, when the mold is released, the secondary molded product is peeled off from the primary molded product and sticks to the mold, and when used as a pen for a long period of time, the elastomer becomes sweaty. There was a problem that it swelled and shifted or turned up.

【０００４】[0004]

【課題を解決するための手段】本発明は上記問題点を解
決することを目的とし、円筒状の１次成形品表面に所定
巾の環状凹部を形成し、所定位置にコアピンに当接する
突き当てピンにより通孔を形成し、コアピンを後退させ
た時コアピン外周に形成した小径部又は凹部により通孔
と連通し、通孔より外側にはみ出した部分を有する空隙
部を形成し、次いで環状凹部に樹脂を射出して２次成形
品を形成し、該樹脂が前記空隙部に流入して２次成形品
に抜け止め部を形成するようにしたことを特徴とする。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems by forming an annular concave portion having a predetermined width on the surface of a cylindrical primary molded product, and abutting against a core pin at a predetermined position. A through-hole is formed by the pin, and when the core pin is retracted, the small-diameter portion or the recess formed on the outer periphery of the core pin communicates with the through-hole to form a void having a portion protruding outside the through-hole, and then to the annular recess. A secondary molded product is formed by injecting a resin, and the resin flows into the gap to form a retaining portion in the secondary molded product.

【０００５】[0005]

【発明の実施の形態】本発明の実施の形態を図示した各
実施例に基づいて詳細に説明する。図１乃至図４は本発
明の第１実施例である。１はボールペンの軸筒のような
円筒状１次成形品で、外周グリップ部に所定巾の環状凹
部２を形成し、径方向に複数個の通孔３を設けている。
４はコアピンで、該通孔３を越した位置迄は大径円筒部
５とし、それより前方は小径円筒部６として段部７を形
成している。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4 show a first embodiment of the present invention. Reference numeral 1 denotes a cylindrical primary molded product such as a barrel of a ballpoint pen, which has an annular concave portion 2 having a predetermined width in an outer peripheral grip portion, and a plurality of through holes 3 provided in a radial direction.
A core pin 4 has a large-diameter cylindrical portion 5 up to a position beyond the through hole 3 and a small-diameter cylindrical portion 6 in front of it forms a stepped portion 7.

【０００６】次に成形方法について説明する。図１は１
次成形が終了した状態であり、突き当てピンにより通孔
３が形成されている。この状態でコアピン４を図３の如
く少しだけ抜くと通孔３下面に該通孔３の巾より巾広の
空間部８を形成する。次いで、ゴム又はエラストマー等
の軟質樹脂を環状凹部２に流入すると、図４の如く２次
成形品９が形成され、空間部８下面はコアピン４の小径
円筒部６が当接しているので抜け止め部９ａが形成され
る。なお、前記突き当てピンは金型と別体であってもよ
いし、金型自体に突部として形成してもよい。Next, a molding method will be described. FIG.
This is a state where the next molding is completed, and the through holes 3 are formed by the butting pins. In this state, when the core pin 4 is slightly pulled out as shown in FIG. 3, a space portion 8 wider than the width of the through hole 3 is formed on the lower surface of the through hole 3. Next, when a soft resin such as rubber or elastomer flows into the annular concave portion 2, a secondary molded product 9 is formed as shown in FIG. 4, and the lower surface of the space 8 is prevented from coming off because the small-diameter cylindrical portion 6 of the core pin 4 is in contact. A portion 9a is formed. The abutment pin may be separate from the mold, or may be formed as a protrusion on the mold itself.

【０００７】図５、図６は本発明の第２実施例である。
１１はボールペンの軸筒のような円筒状１次成形品で、
外周グリップ部に所定巾の環状凹部１２を形成し、突き
当てピンにより環状凹部１２に通孔１３を形成し、更に
該通孔１３に連通する小径凹部１４をコアピン１５外周
面に形成している。FIGS. 5 and 6 show a second embodiment of the present invention.
11 is a cylindrical primary molded product such as a ball-point pen barrel,
An annular concave portion 12 having a predetermined width is formed in the outer peripheral grip portion, a through hole 13 is formed in the annular concave portion 12 by an abutting pin, and a small diameter concave portion 14 communicating with the through hole 13 is formed on the outer peripheral surface of the core pin 15. .

【０００８】次に作用について説明する。図５は１次成
形が終了した状態である。この状態でコアピン１５を図
６の如く少しだけ抜き、小径凹部１４の一側が通孔１３
下面一側（右側）より外側にはみ出した部分を有する空
隙部を形成する。次いで、ゴム又はエラストマー等の軟
質樹脂を環状凹部１２に流入すると、図５の如く２次成
形品が形成され、小径凹部１４が１次成形品１１の通孔
１３下面の外側に係止する抜け止め部１４ａが形成され
る。Next, the operation will be described. FIG. 5 shows a state in which the primary molding has been completed. In this state, the core pin 15 is slightly pulled out as shown in FIG.
A gap having a portion protruding outside one side (right side) of the lower surface is formed. Next, when a soft resin such as rubber or elastomer flows into the annular recess 12, a secondary molded product is formed as shown in FIG. 5, and the small-diameter recess 14 is locked to the outside of the lower surface of the through hole 13 of the primary molded product 11. A stop 14a is formed.

【０００９】[0009]

【発明の効果】本発明によると、円筒状の１次成形品表
面に所定巾の環状凹部を形成し、所定位置にコアピンに
当接する突き当てピンにより通孔を形成し、コアピンを
後退させた時コアピン外周に形成した小径部又は凹部に
より通孔と連通し、通孔より外側にはみ出した部分を有
する空隙部を形成し、次いで環状凹部に樹脂を射出して
２次成形品を形成し、該樹脂が前記空隙部に流入して２
次成形品に抜け止め部を形成するようにしているので、
１次成形品と２次成形品が溶融しない場合でも抜け止め
部により確実に一体化し、ずれたり、めくれたりするこ
とがなく、又離型の際剥がれて金型に残ることを確実に
防止できる。According to the present invention, an annular concave portion having a predetermined width is formed on the surface of a cylindrical primary molded product, and a through hole is formed at a predetermined position by an abutting pin which contacts the core pin, and the core pin is retracted. The core pin communicates with the through hole by a small diameter portion or recess formed on the outer periphery, forms a void having a portion protruding outside the through hole, and then injects resin into the annular recess to form a secondary molded product, The resin flows into the space and
Since a retaining part is formed in the next molded product,
Even when the primary molded product and the secondary molded product are not melted, they are securely integrated by the retaining portion, so that they do not shift or turn over, and can be reliably prevented from peeling off during mold release and remaining in the mold. .

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明方法により成形した第１実施例１次成形
品の正断面図である。FIG. 1 is a front sectional view of a primary molded product of a first embodiment molded by a method of the present invention.

【図２】図１のＡ−Ａ側断面図である。FIG. 2 is a sectional view taken along the line AA of FIG.

【図３】図１のコアピンを少し引き抜いた正断面図であ
る。FIG. 3 is a front sectional view in which the core pin of FIG. 1 is slightly pulled out.

【図４】図３に２次成形用樹脂を流入した状態の正断面
図である。FIG. 4 is a front sectional view showing a state in which a secondary molding resin has flowed into FIG. 3;

【図５】本発明方法により成形した第２実施例１次成形
品の正断面図である。FIG. 5 is a front sectional view of a primary molded product of a second embodiment molded by the method of the present invention.

【図６】図５に２次成形用樹脂を流入した状態の正断面
図である。FIG. 6 is a front sectional view showing a state in which a secondary molding resin has flowed into FIG. 5;

【符号の説明】[Explanation of symbols]

１ 円筒状１次成形品 ２ 環状凹部 ３ 通孔 ４ コアピン ５ コアピンの大径円筒部 ６ コアピンの小径円筒部 ７ 段部 ８ 空間部 ９ ２次成形品 ９ａ ２次成形品の抜け止め部 １１ 円筒状１次成形品 １２ 環状凹部 １３ 通孔 １４ 小径凹部 １４ａ 抜け止め部 １５ コアピン DESCRIPTION OF SYMBOLS 1 Cylindrical primary molded product 2 Annular concave part 3 Through-hole 4 Core pin 5 Large-diameter cylindrical part of core pin 6 Small-diameter cylindrical part of core pin 7 Step part 8 Space part 9 Secondary molded product 9a Retaining part of secondary molded product 11 Cylindrical Primary molded product 12 Annular recess 13 Through hole 14 Small diameter recess 14a Retaining portion 15 Core pin

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 円筒状の１次成形品表面に所定巾の環状
凹部を形成し、所定位置にコアピンに当接する突き当て
ピンにより通孔を形成し、コアピンを後退させた時コア
ピン外周に形成した小径部又は凹部により通孔と連通
し、通孔より外側にはみ出した部分を有する空隙部を形
成し、次いで環状凹部に樹脂を射出して２次成形品を形
成し、該樹脂が前記空隙部に流入して２次成形品に抜け
止め部を形成するようにした円筒状成形品外周に軟質樹
脂を射出一体化する方法。1. An annular concave portion having a predetermined width is formed on the surface of a cylindrical primary molded product, a through hole is formed at a predetermined position by an abutting pin that abuts on the core pin, and formed around the core pin when the core pin is retracted. A void having a portion that communicates with the through-hole by the small-diameter portion or the recess formed, and has a portion protruding outside the through-hole, and then injects a resin into the annular recess to form a secondary molded product; A method in which a soft resin is injected and integrated around the outer periphery of a cylindrical molded product in which the resin flows into a secondary molded product to form a retaining portion in the secondary molded product.
JP18906997A 1997-06-30 1997-06-30 Method for injection-integrating soft resin into periphery of cylindrical molding Pending JPH1119969A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18906997A JPH1119969A (en) 1997-06-30 1997-06-30 Method for injection-integrating soft resin into periphery of cylindrical molding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18906997A JPH1119969A (en) 1997-06-30 1997-06-30 Method for injection-integrating soft resin into periphery of cylindrical molding

Publications (1)

Publication Number Publication Date
JPH1119969A true JPH1119969A (en) 1999-01-26

Family

ID=16234789

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18906997A Pending JPH1119969A (en) 1997-06-30 1997-06-30 Method for injection-integrating soft resin into periphery of cylindrical molding

Country Status (1)

Country Link
JP (1) JPH1119969A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001051269A1 (en) * 2000-01-10 2001-07-19 Merz & Krell Gmbh & Co. Kgaa Production of a front section of a writing implement, comprising a one-piece preform
JP2005193431A (en) * 2004-01-05 2005-07-21 Mitsubishi Pencil Co Ltd Holder tube with grip
JP2009184198A (en) * 2008-02-05 2009-08-20 Zebra Pen Corp Writing utensil

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001051269A1 (en) * 2000-01-10 2001-07-19 Merz & Krell Gmbh & Co. Kgaa Production of a front section of a writing implement, comprising a one-piece preform
US6802664B2 (en) 2000-01-10 2004-10-12 Merz & Krell Gmbh & Co., Kgaa Production of a front portion of a writing instrument, comprising a one-piece preform
JP2005193431A (en) * 2004-01-05 2005-07-21 Mitsubishi Pencil Co Ltd Holder tube with grip
JP4636585B2 (en) * 2004-01-05 2011-02-23 三菱鉛筆株式会社 Shaft cylinder with grip
JP2009184198A (en) * 2008-02-05 2009-08-20 Zebra Pen Corp Writing utensil

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