JP2003191286A - Mold for in-mold coating molding - Google Patents

Mold for in-mold coating molding

Info

Publication number
JP2003191286A
JP2003191286A JP2001393457A JP2001393457A JP2003191286A JP 2003191286 A JP2003191286 A JP 2003191286A JP 2001393457 A JP2001393457 A JP 2001393457A JP 2001393457 A JP2001393457 A JP 2001393457A JP 2003191286 A JP2003191286 A JP 2003191286A
Authority
JP
Japan
Prior art keywords
mold
cavity
paint
coating
resin
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.)
Granted
Application number
JP2001393457A
Other languages
Japanese (ja)
Other versions
JP3843833B2 (en
Inventor
Toshio Arai
俊夫 荒井
Etsuo Okahara
悦雄 岡原
Takashi Okusako
隆 奥迫
Kazuaki Kobayashi
和明 小林
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.)
Ube Machinery Corp Ltd
Original Assignee
Ube Machinery Corp 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 Ube Machinery Corp Ltd filed Critical Ube Machinery Corp Ltd
Priority to JP2001393457A priority Critical patent/JP3843833B2/en
Priority to PCT/JP2002/007419 priority patent/WO2003009985A1/en
Priority to CNB028182758A priority patent/CN1328031C/en
Priority to US10/483,263 priority patent/US7309221B2/en
Priority to CA2453915A priority patent/CA2453915C/en
Priority to KR20047000902A priority patent/KR100848171B1/en
Publication of JP2003191286A publication Critical patent/JP2003191286A/en
Application granted granted Critical
Publication of JP3843833B2 publication Critical patent/JP3843833B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16Making multilayered or multicoloured articles
    • B29C45/1679Making multilayered or multicoloured articles applying surface layers onto injection-moulded substrates inside the mould cavity, e.g. in-mould coating [IMC]
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16Making multilayered or multicoloured articles
    • B29C2045/1687Making multilayered or multicoloured articles preventing leakage of second injected material from the mould cavity

Landscapes

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for in-mold coating molding which prevents the leak of paint generated at the time of in-mold coating molding over a long period of time. <P>SOLUTION: In the mold for in-mold coating molding applying coating to the surface of the resin molded article, which is molded in a mold cavity 5, in the mold cavity 5, an auxiliary cavity 1 extending in the on-off direction of the mold is provided over the whole periphery of the mold cavity 5 and the groove part 3 formed over the whole periphery of the auxiliary cavity 1 is provided on the coating surface side of the auxiliary cavity 1. In the mold 100 for in-mold coating molding, the leak of the paint from the gap generated when the resin charged in the groove part 3 becomes a projection is prevented by sealing the gap even in such a case that the resin in the auxiliary cavity 1 is shrunk by cooling and a slight gap is generated between the shrunk resin and the mold. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は、金型内で樹脂を成
形した後、樹脂成形品と金型キャビティ面との間に塗料
を注入して硬化させることにより、樹脂成形品の表面に
被覆(被膜あるいは塗膜と称することもある)を施す型
内被覆成形方法に用いる型内被覆成形用金型に関する。 【0002】 【従来の技術】従来から、熱可塑性樹脂を基材とした樹
脂成形品の装飾性を高める方法として、塗装法による加
飾が多く用いられている。従来から行われている塗装法
は、金型内で射出成形した成形品を該金型から取り出し
た後、スプレー法や浸漬法等により、成形品の表面に塗
料の塗布を行うことが一般的であり、塗布された塗料は
その後硬化することによって、強固な塗膜となって成形
品の表面を被覆し、該表面を加飾するとともに保護す
る。 【0003】しかしながら、近年においては前記塗装方
法による工程の省略化を目的とし、樹脂の成形と塗膜に
よる被覆を同一の金型内で行う型内被覆成形方法(イン
モールドコーティング方法と称されることもある)が提
案されている。 【0004】前記型内被覆成形方法による工程概略を説
明するためのフローチャートを図6に示す。図6に示し
た型内被覆成形方法は、樹脂を金型内で射出成形した
後、金型をわずかに開いた状態とすることによって型内
で成形した樹脂成形品と金型キャビティ面との間に隙間
を生じさせる。そして、該隙間に塗料注入機を使用して
塗料を注入した後、金型を再度型締することによって成
形品の表面に塗料を均一に拡張させた後、硬化させて被
覆する。 【0005】前記型内被覆成形方法によれば、熱可塑性
樹脂の成形と前記被覆を同一の金型内で行うため、工程
の省略化によるコストダウンが可能であると同時に、浮
遊している塵が硬化する以前の塗膜に付着して不良とな
る等といったことがほとんどなく、高い品質の製品を得
ることができる。そのため、特に、外観に対して高い品
質が要求される自動車用の部品、例えば、バンパー、ド
アミラーカバー、フェンダー、等多くの部品には、前記
型内被覆成形方法の利用が検討されている。 【0006】 【発明が解決しようとする課題】ここで、型内被覆成形
方法の多くは塗料の漏れを防止するために金型キャビテ
ィの全周にわたってくいきり構造の嵌合部を有した金型
を用いて実施される。しかし、実際の塗料注入の際にお
いては、該くいきり構造の嵌合部(くいきり部と称する
こともある)から金型キャビティの外に塗料が漏れる場
合があり、特に金型の使用回数が増えるとくいきり部が
磨耗することによって、くいきり部の隙間が徐々に大き
くなるため、塗料の漏れが発生しやすい。なお、前記く
いきり部は一般的にシェアーエッジ構造と称される場合
もある。 【0007】前記問題を防止する金型として、金型キャ
ビティの全周にわたって補助キャビティを設け、該補助
キャビティに樹脂を充填することにより塗料の漏れを防
止する型内被覆成形用金型が、特開2001−1383
34に提案されている。この金型は、くいきり部が磨耗
しても塗料の漏れが発生しにくいという優れた効果を備
えた金型であるが、該補助キャビティ内に充填した樹脂
の収縮によって、塗料の漏れが発生する場合があるとい
う問題点を有した。図5に前記補助キャビティを用いた
従来金型による塗料漏れ発生の原因を概念的に説明する
が、図5(a)に示したように補助キャビティ1内に充
填された樹脂が、図5(b)に示した微小型開後までに
冷却されて熱収縮することによって、補助キャビティ1
内と金型面との間にわずかな隙間を生じさせる。そし
て、該生じた隙間より、図5(C)に示すような形で、
塗料が漏れ出す。 【0008】本発明は、上記問題点に鑑みてなされたも
のであり、型内被覆成形方法の際において塗料漏れを長
期にわたり防止することのできる型内被覆成形用金型に
関するものである。 【0009】 【課題を解決するための手段】上記の課題を解決するた
め、本発明による型内被覆成形用金型は、(1) 雄型
と雌型により形成される金型キャビティとくいきり構造
の嵌合部とを有し、該金型キャビティで成形した樹脂成
形品の表面に該金型キャビティ内で被覆を施すための塗
料注入機を備える型内被覆成形用金型において、当該金
型の開閉方向に延在する補助キャビティを当該金型キャ
ビティの全周にわたって設けるとともに、該補助キャビ
ティの被覆面側に該補助キャビティの全周にわたって形
成した溝部を設ける。 【0010】 【発明の実施の形態】以下、図面に基づいて本発明によ
る型内被覆成形用金型の実施形態について説明する。図
1〜図4は本発明による実施形態の好ましい1例に係わ
り、図1は型内被覆成形用金型の構造を説明するための
断面図であり、図2は型内被覆成形用金型に形成した溝
部によって成形された突起部が塗料漏れを防止する際の
挙動を説明するための概念図である。図3は型内被覆成
形用金型に形成した溝部の形状を説明するための要部断
面図である。図4は本発明に係わる他の実施形態による
型内被覆成形用金型の構造を説明するための要部断面図
である。図5は従来金型において塗料漏れが発生する際
の挙動を説明するための概念図である。図6は型内被覆
成形方法の工程を説明するフローチャートである。 【0011】本発明に係わる型内被覆成形用金型100
(金型100と称することもある)の好ましい1例につ
いて、その構造を図1を用いて以下詳細に説明する。本
発明による金型100は、可動型10、固定型20、お
よび塗料注入機50を備えており、図1に示した本発明
による実施形態の1例においては、可動型10が雌型で
あり、固定型20が雄型である。 【0012】図1に示した金型100は、雄型である固
定型20と雌型である可動型10とがくいきり構造の嵌
合部で嵌め合わされて、当該金型の開閉方向に延在する
補助キャビティ1を当該金型キャビティ5の全周にわた
って形成するように構成されている。そして、該補助キ
ャビティ1を介してくいきり構造の嵌合部と金型キャビ
ティ5とが連通する構造となっている。 【0013】また、図1に示した実施形態においては、
補助キャビティ1の外周側(塗装面側)に、補助キャビ
ティの全周にわたって、断面が半円状の溝部3を設け
た。上記のような金型100の構造とすることによっ
て、射出の際に金型キャビティ5に充填される樹脂は、
同時に補助キャビティ1及び溝部3にも充填される構造
としている。補助キャビティ1及び溝部3に樹脂が充填
された状態を図2(a)に示す。 【0014】なお、図1に示した実施形態においては、
雄型である固定型20に補助キャビティを形成し、雌型
である可動型10に溝部3を形成した。しかし、本発明
に係わる補助キャビティ1と溝部3の配設位置は、これ
に限るものではなく、塗装面側ではない金型に補助キャ
ビティを形成し、塗装面側の金型に溝部3を形成すれば
良い。 【0015】また、図1に示した金型100に形成した
溝部3は、その断面が図3(a)に示したような半円状
の溝部3としたが、溝部3の形状はこれに限るものでは
なく、例えば、図3(b)に示した矩形の溝、図3
(C)に示した台形の溝、または図3(d)に示した三
角の溝等であっても良い。溝部3の溝深さは、最も深い
ところで(可動型10の開閉方向に対して垂直な方向に
おける長さ)は0.01〜0.5mmの範囲とすること
が好ましく、さらに好ましくは、0.1〜0.2mmの
範囲である。溝部の幅は、前記溝深さの0.1倍〜10
倍までの範囲が好ましいが、これに限るものではない。 【0016】また、補助キャビティ1の長さ(可動型1
0の開閉方向における長さをいう。)Lは0.5〜30
mmの範囲とし、厚み(可動型10の開閉方向に対して
垂直な方向における長さをいう。)Lは0.1 〜2m
mの範囲とすることが好ましい。 【0017】次に、塗料注入機50の構造についてその
1例を簡単に説明する。本実施の形態における塗料注入
機50(インジェクタと称することもある)は、可動型
10に取り付けられて、可動型10の金型キャビティ5
に配設された塗料注入口51より金型キャビティ5内に
塗料を注入することができるよう構成されている。ま
た、塗料注入機50の塗料注入口51には図示しないバ
ルブが取りつけられており、基材の射出成形時において
は、該バルブが閉じられていることによって、金型10
0の金型キャビティ5内に射出された樹脂が塗料注入口
51より塗料注入機50内に進入することを防止してい
る。 【0018】そして、本実施の形態における塗料注入機
50は、図示しない駆動装置によって駆動されて、塗料
注入機50の中に供給された塗料を、所望する量だけ正
確に可動型10のキャビティ5面より注入することがで
きるよう構成されている。 【0019】なお、本実施の形態における塗料注入機5
0は、前記したように可動型10のキャビティ5面より
塗料を注入するよう構成したが、これに限るものではな
く、金型キャビティ5内で成形した樹脂成形品と金型キ
ャビティ5面との間に生じた隙間部分に塗料を注入でき
るように構成すれば良く、塗料注入機50は固定型20
に取りつけられる等しても良い。また、本実施の形態に
おいて塗料注入機50は、一台であるがこれに限るもの
ではなく、複数台であっても良い。 【0020】以下、金型100を用いた型内被覆成形方
法の詳細を図1、図2及び図6を用いて説明する。ま
ず、第1の工程として、図示しない射出成形機の型締装
置によって金型100を型締めする。そして、基材であ
る熱可塑性樹脂を金型内に射出(本実施の形態において
は、基材としてABS樹脂:宇部サイコン株式会社製
UT20B)して、基材をある程度(金型を開いても成
形品が変形しない程度)まで冷却させる。金型100内
の金型キャビティ5内に樹脂が充填された状態を図2
(a)に示す。図2(a)に示した実施形態において
は、補助キャビティ1、及び溝部3に樹脂が進入して固
化している状態となっている。 【0021】基材の冷却後、図2(b)に示すように金
型をわずかに開いた微小型開状態(本実施の形態におい
ては1mmほど型開方向に可動型10を移動させた状
態)として、金型キャビティ5内で成形した樹脂成形品
と可動型10の金型キャビティ5面との間に被覆のため
の塗料を注入するための空間を生じさせる。 【0022】この際において、溝部3に充填された樹脂
は、補助キャビティ1に充填していた樹脂に引っ張られ
る形で、溝部3より外に出る。溝部3に充填されていた
樹脂は、溝部3を出ることによって突起となって、金型
内を移動しようとする。 【0023】ここで、金型内に充填された樹脂は固化に
よって収縮するため、補助キャビティ1で成形した樹脂
と金型面との間にほんのわずかな隙間が形成されるが、
前述した溝部3に充填されていた樹脂が、溝部3を出る
ことによって突起となって、金型内を押しつぶされなが
ら移動することにより、前記わずかな隙間を埋めてしま
う。 【0024】前記塗料を注入するための空間を生じさせ
た後、前記空間に塗料注入機50を介し塗料を7ml
(ミリリットル)注入する。なお、本実施の形態におい
て用いた塗料の成分を表1に示す。 【0025】 【表1】 【0026】前記隙間に塗料注入機50を使用して塗料
を注入した後、可動型10を固定型20の方向に移動さ
せ金型100を再度閉じて型締めすることにより、隙間
の中の塗料を押し広げながら流動させ、金型100のキ
ャビティ5内の隅々まで行き渡らせると同時に圧力をか
けたままの状態とする。 【0027】この際において、溝部3が形成されていな
い従来の金型の場合は、図5にその挙動を概念的に説明
しているような形で、補助キャビティ1と金型面との間
に生じたわずかな隙間より塗料が漏れ出すことがある。
しかし、本実施形態の金型100を用いて被覆成形を行
えば、図2(C)に示したように、溝部3に充填されて
いた樹脂が突起となって金型を移動することによって、
塗料が漏れ出す隙間を溝部で成形した突起部が封止する
ので、塗料漏れの問題を防止することが可能である。 【0028】前述したような工程によって、塗料を金型
100のキャビティ5内の隅々まで行き渡らせると同時
に圧力をかけたままの状態で硬化させ、塗料硬化後、型
を開いて製品を取り出す。なお、本実施の形態において
用いた塗料は、熱硬化性の塗料であり、設定した金型温
度によって容易に硬化する。 【0029】以上説明したように、図1に示した実施形
態によれば、漏れた塗料が次成形において製品に混入し
悪影響をおよぼす、あるいは金型を傷つける等といった
問題を引き起こすことがないので、長期に安定した型内
被覆成形を行うことが可能である。 【0030】また、本発明による他の実施形態として、
溝部3を形成した金型部分を入れ子構造とし、該入れ子
部分に加熱体Kを配した場合を図4に示す。加熱体Kは
該嵌合部に沿って該嵌合部を囲むように周設され、該加
熱体Kの中に配した図示しないヒータによって、金型キ
ャビティ5内に注入された塗料を加熱することができ
る。 【0031】前記加熱体Kを配した型内被覆成形用金型
は、金型内より漏れ出そうとする塗料を加熱体Kで強く
加熱することによって硬化反応を促進させるといった作
用を有し、硬化反応が進行した樹脂は粘度が上がること
によって流動しにくくなるため、くいきり部よりの塗料
漏れがさらに発生しにくくなるといった優れた効果を有
する。 【0032】なお、図4に示した実施形態は、加熱体K
を該嵌合部を囲むように周設することにより、嵌合部全
面の塗料漏れをさらに発生しにくくする点で特に効果が
高く好ましいが、嵌合部全周にわたって加熱体Kを配設
する必要はなく、加熱体Kを嵌合部の要所に配しさえす
れば塗料の漏れを防止することが可能であって、加熱体
Kが嵌合部の全周にわたって配設されている必要はな
い。なお、図4に示した実施形態に使用した加熱体K
は、その内部に電熱式のヒータH1を配する方式である
が、加熱体Kこれに限らず熱媒流路等に加熱した油を流
す方式であっても良く、また電熱式ヒータH1と熱媒流
路を併用する方式であっても良い。 【0033】 【発明の効果】本発明の型内被覆成形用金型によれば、
補助キャビティ内に充填された樹脂が冷却により収縮
し、金型との間にわずかな隙間を生じるような場合にお
いても、溝部に充填されていた樹脂が突起となって生じ
た隙間を封止するため、前記隙間からの塗料漏れを防止
できるといった優れた作用効果を有する。 【0034】本発明における型内被覆成形用金型は、塗
料の漏れを効果的に防止するので、漏れた塗料が次成形
において製品に混入し悪影響をおよぼす、あるいは金型
を傷つける等といった問題を引き起こすことがなく、長
期に安定した型内被覆成形を行うことが可能である。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a resin in a mold, and then injecting and curing a paint between a resin molded product and a mold cavity surface. Accordingly, the present invention relates to an in-mold coating molding die used in an in-mold coating molding method for applying a coating (also referred to as a coating film or a coating film) on the surface of a resin molded product. 2. Description of the Related Art Conventionally, as a method for improving the decorativeness of a resin molded product using a thermoplastic resin as a base material, decoration by a coating method has been often used. Conventional coating methods generally involve applying a paint to the surface of a molded article by spraying, dipping, or the like after removing the molded article obtained by injection molding in the mold from the mold. The applied paint is then cured to form a strong coating, which covers the surface of the molded article, decorates and protects the surface. However, in recent years, in order to eliminate the steps of the above-mentioned coating method, an in-mold coating forming method in which resin molding and coating with a coating film are performed in the same mold (referred to as an in-mold coating method). Sometimes). FIG. 6 is a flowchart for explaining the outline of the process according to the in-mold coating forming method. The in-mold coating molding method shown in FIG. 6 is a method in which a resin molded product molded in a mold and a mold cavity surface are formed by injecting a resin in the mold and then slightly opening the mold. Create a gap between them. After the paint is injected into the gap using a paint injector, the paint is uniformly spread on the surface of the molded product by re-clamping the mold, and then cured and coated. According to the in-mold coating molding method, since the molding of the thermoplastic resin and the coating are performed in the same mold, the cost can be reduced by omitting the steps, and at the same time, the floating dust It hardly adheres to the coating film before curing and becomes defective, and a high quality product can be obtained. Therefore, the use of the in-mold coating forming method is being studied especially for many parts such as bumpers, door mirror covers, fenders, etc. for automobiles that require high quality in appearance. [0006] Here, most of the in-mold coating molding methods employ a mold having a fitting portion with a continuous structure over the entire periphery of a mold cavity in order to prevent paint leakage. It is carried out using. However, at the time of actual paint injection, the paint may leak out of the mold cavity from the fitting portion (sometimes referred to as a “feed portion”) of the drawing structure. When the number increases, the gap of the drawing portion gradually increases due to the wear of the drawing portion, so that the paint tends to leak. In addition, the above-mentioned swirling portion may be generally called a shear edge structure. [0007] As a mold for preventing the above-mentioned problem, there is a mold for in-mold coating molding, in which an auxiliary cavity is provided over the entire periphery of the mold cavity, and the auxiliary cavity is filled with resin to prevent paint leakage. Open 2001-1383
34. This mold has the excellent effect that the paint does not easily leak even if the kinks are worn. In some cases. FIG. 5 conceptually explains the cause of paint leakage caused by the conventional mold using the auxiliary cavity. As shown in FIG. 5A, the resin filled in the auxiliary cavity 1 is the same as FIG. The auxiliary cavity 1 is cooled and thermally contracted by the time the mold is opened as shown in FIG.
A slight gap is created between the inside and the mold surface. Then, from the generated gap, in the form shown in FIG.
Paint leaks out. The present invention has been made in view of the above problems, and relates to an in-mold coating molding die capable of preventing paint leakage for a long time during the in-mold coating molding method. Means for Solving the Problems To solve the above-mentioned problems, a mold for in-mold coating molding according to the present invention comprises: (1) a mold cavity formed by a male mold and a female mold; A fitting portion having a structure, and a mold for in-mold coating molding having a paint injection machine for applying a coating in the mold cavity to a surface of a resin molded product molded in the mold cavity. An auxiliary cavity extending in the mold opening and closing direction is provided over the entire circumference of the mold cavity, and a groove formed over the entire circumference of the auxiliary cavity is provided on the coating surface side of the auxiliary cavity. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a mold for in-mold coating forming according to the present invention will be described below with reference to the drawings. 1 to 4 relate to a preferred example of an embodiment according to the present invention. FIG. 1 is a cross-sectional view for explaining the structure of an in-mold coating molding die, and FIG. 2 is an in-mold coating molding die. FIG. 9 is a conceptual diagram for explaining the behavior when the protrusion formed by the groove formed in the first embodiment prevents paint leakage. FIG. 3 is a cross-sectional view of a main part for describing the shape of a groove formed in the in-mold coating forming die. FIG. 4 is a cross-sectional view of a main part for describing the structure of an in-mold coating forming die according to another embodiment of the present invention. FIG. 5 is a conceptual diagram for explaining the behavior when paint leakage occurs in a conventional mold. FIG. 6 is a flowchart illustrating the steps of the in-mold coating forming method. [0011] A mold 100 for forming an in-mold coating according to the present invention.
One preferred example of the mold (sometimes referred to as a mold 100) will be described in detail below with reference to FIG. The mold 100 according to the present invention includes a movable mold 10, a fixed mold 20, and a paint injection machine 50. In an example of the embodiment according to the present invention illustrated in FIG. 1, the movable mold 10 is a female mold. The fixed mold 20 is a male mold. In the mold 100 shown in FIG. 1, a fixed mold 20 as a male mold and a movable mold 10 as a female mold are fitted in a fitting portion having a drawing structure, and extend in the opening and closing direction of the mold. The existing auxiliary cavity 1 is formed over the entire circumference of the mold cavity 5. Then, the fitting portion having the swirl structure and the mold cavity 5 are configured to communicate with each other through the auxiliary cavity 1. Further, in the embodiment shown in FIG.
A groove 3 having a semicircular cross section was provided on the outer peripheral side (painted surface side) of the auxiliary cavity 1 over the entire periphery of the auxiliary cavity. By using the structure of the mold 100 as described above, the resin filled in the mold cavity 5 at the time of injection is:
At the same time, the auxiliary cavity 1 and the groove 3 are filled. FIG. 2A shows a state in which the auxiliary cavity 1 and the groove 3 are filled with resin. Incidentally, in the embodiment shown in FIG.
Auxiliary cavities were formed in the male fixed mold 20 and the grooves 3 were formed in the female movable mold 10. However, the positions of the auxiliary cavities 1 and the grooves 3 according to the present invention are not limited to this, and the auxiliary cavities are formed in the mold not on the painted surface side, and the grooves 3 are formed in the mold on the painted surface side. Just do it. The groove 3 formed in the mold 100 shown in FIG. 1 has a semicircular groove 3 as shown in FIG. 3A, but the shape of the groove 3 is different from that shown in FIG. The present invention is not limited to this. For example, the rectangular groove shown in FIG.
The trapezoidal groove shown in FIG. 3C or the triangular groove shown in FIG. The groove depth of the groove 3 is preferably in the range of 0.01 to 0.5 mm at the deepest point (length in the direction perpendicular to the opening and closing direction of the movable mold 10), and more preferably 0.1 to 0.5 mm. It is in the range of 1 to 0.2 mm. The width of the groove is 0.1 to 10 times the groove depth.
A range up to twice is preferred, but not limited to this. The length of the auxiliary cavity 1 (movable mold 1)
It means the length in the opening and closing direction of 0. ) L is 0.5-30
mm, and the thickness L (the length in a direction perpendicular to the opening and closing direction of the movable mold 10) L is 0.1 to 2 m.
m. Next, an example of the structure of the paint injector 50 will be briefly described. The paint injector 50 (also referred to as an injector) in the present embodiment is attached to the movable mold 10 and the mold cavity 5 of the movable mold 10 is provided.
Is configured to be able to inject paint into the mold cavity 5 through a paint inlet 51 provided in the mold. A valve (not shown) is attached to the paint injection port 51 of the paint injection machine 50. At the time of injection molding of the base material, the valve is closed so that the mold 10 is closed.
The resin injected into the mold cavity 5 is prevented from entering the paint injector 50 through the paint inlet 51. The paint injector 50 in the present embodiment is driven by a drive device (not shown) to accurately supply the paint supplied into the paint injector 50 by a desired amount to the cavity 5 of the movable mold 10. It is configured so that it can be injected from the surface. It should be noted that the paint injection machine 5 in the present embodiment
Reference numeral 0 indicates that the paint is injected from the cavity 5 surface of the movable mold 10 as described above. However, the present invention is not limited to this, and the resin molded product molded in the mold cavity 5 and the mold cavity 5 surface The paint injecting machine 50 may be configured so that the paint can be injected into the gap formed therebetween.
It may be attached to, for example. Further, in the present embodiment, the number of paint injectors 50 is one, but the invention is not limited to this, and a plurality of paint injectors may be used. Hereinafter, details of the method for forming and coating the inside of the mold using the mold 100 will be described with reference to FIGS. 1, 2 and 6. FIG. First, as a first step, the mold 100 is clamped by a mold clamping device of an injection molding machine (not shown). Then, a thermoplastic resin as a base material is injected into a mold (in the present embodiment, an ABS resin as a base material: manufactured by Ube Sicon Co., Ltd.)
UT 20B) to cool the substrate to a certain extent (to such an extent that the molded product is not deformed even when the mold is opened). FIG. 2 shows a state in which the mold cavity 5 in the mold 100 is filled with resin.
(A). In the embodiment shown in FIG. 2A, the resin enters the auxiliary cavity 1 and the groove 3 and is solidified. After the substrate is cooled, the mold is slightly opened as shown in FIG. 2 (b) (in this embodiment, the movable mold 10 is moved by about 1 mm in the mold opening direction). In step (1), a space is formed between the resin molded product molded in the mold cavity 5 and the surface of the mold cavity 5 of the movable mold 10 to inject paint for coating. At this time, the resin filled in the groove 3 goes out of the groove 3 by being pulled by the resin filled in the auxiliary cavity 1. The resin that has been filled in the groove 3 becomes a projection by exiting the groove 3 and tends to move in the mold. Here, since the resin filled in the mold shrinks due to solidification, a slight gap is formed between the resin molded in the auxiliary cavity 1 and the mold surface.
The resin that has been filled in the groove 3 becomes a projection when it exits the groove 3 and moves while being crushed in the mold, thereby filling the small gap. After a space for injecting the paint is created, 7 ml of the paint is injected into the space through a paint injecting machine 50.
Inject (milliliter). Table 1 shows the components of the paint used in the present embodiment. [Table 1] After the paint is injected into the gap using the paint injector 50, the movable mold 10 is moved in the direction of the fixed mold 20, the mold 100 is closed again, and the mold is closed. Is spread while spreading, and is spread to every corner in the cavity 5 of the mold 100, and at the same time, the pressure is kept applied. At this time, in the case of the conventional mold in which the groove 3 is not formed, the behavior between the auxiliary cavity 1 and the mold surface is conceptually described in FIG. The paint may leak out of the small gap created in the above.
However, if the coating molding is performed using the mold 100 of the present embodiment, as shown in FIG. 2C, the resin filled in the groove portion 3 becomes a projection and moves the mold.
Since the protrusion formed by the groove seals the gap from which the paint leaks, it is possible to prevent the problem of paint leak. According to the above-described steps, the paint is spread to all corners in the cavity 5 of the mold 100 and is cured while applying pressure. After the paint is cured, the mold is opened and the product is taken out. The paint used in the present embodiment is a thermosetting paint, and easily cures at a set mold temperature. As described above, according to the embodiment shown in FIG. 1, since the leaked paint does not mix into the product in the next molding and exerts a bad influence, or does not cause a problem such as damaging the mold. It is possible to perform stable in-mold coating molding for a long period of time. In another embodiment according to the present invention,
FIG. 4 shows a case where the mold portion having the groove 3 formed therein has a nested structure, and the heating element K is disposed in the nested portion. The heating element K is provided around the fitting section so as to surround the fitting section, and the paint injected into the mold cavity 5 is heated by a heater (not shown) arranged in the heating element K. be able to. The in-mold coating forming die provided with the heating element K has an effect of promoting the curing reaction by strongly heating the paint which is about to leak out of the mold by the heating element K, Since the resin having undergone the curing reaction becomes less likely to flow due to an increase in viscosity, the resin has an excellent effect that the leakage of the paint from the squeezed portion is further reduced. The embodiment shown in FIG.
Is provided so as to surround the fitting portion, so that it is particularly effective and preferable in that paint leakage on the entire fitting portion is less likely to occur. However, the heating element K is provided over the entire circumference of the fitting portion. There is no necessity, and it is possible to prevent the paint from leaking as long as the heating element K is arranged at a key point of the fitting section, and it is necessary that the heating element K is arranged all around the fitting section. There is no. The heating element K used in the embodiment shown in FIG.
Is a method in which an electric heater H1 is disposed inside the heater. However, the heater is not limited to the heating element K, and may be a method in which heated oil is supplied to a heat medium passage or the like. A system using a medium flow path may be used. According to the mold for in-mold coating molding of the present invention,
Even in the case where the resin filled in the auxiliary cavity shrinks due to cooling to cause a slight gap with the mold, the resin filled in the groove seals the gap formed as a projection. Therefore, there is an excellent action and effect that paint leakage from the gap can be prevented. The mold for in-mold coating molding according to the present invention effectively prevents the paint from leaking. Therefore, there is a problem that the leaked paint is mixed into a product in the next molding and exerts an adverse effect, or the mold is damaged. It is possible to perform stable in-mold coating molding for a long time without causing any problem.

【図面の簡単な説明】 【図1】本発明の実施の形態に係わる型内被覆成形用金
型の構成を説明するための断面図である。 【図2】本発明の実施形態に係わる型内被覆成形用金型
に形成した溝部によって成形された突起部が塗料漏れを
防止する際の挙動を説明するための概念図である。 【図3】本発明に係わる型内被覆成形用金型に形成した
溝部の形状を説明するための要部断面図である。 【図4】本発明に係わる他の実施形態による型内被覆成
形用金型の構造を説明するための要部断面図である。 【図5】従来金型において塗料漏れが発生する際の挙動
を説明するための概念図である。 【図6】型内被覆成形方法の工程を説明するフローチャ
ートである。 【符号の説明】 1 補助キャビティ 3 溝部 5 金型キャビティ 10 可動型 20 固定型 50 塗料注入機 51 塗料注入口 100 型内被覆成形用金型 K 加熱体
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view for explaining a configuration of an in-mold coating forming die according to an embodiment of the present invention. FIG. 2 is a conceptual diagram for explaining a behavior when a protrusion formed by a groove formed in a mold for forming an in-mold coating according to an embodiment of the present invention prevents paint leakage. FIG. 3 is a cross-sectional view of a main part for explaining the shape of a groove formed in a mold for in-mold coating molding according to the present invention. FIG. 4 is a cross-sectional view of a main part for describing a structure of an in-mold coating forming die according to another embodiment of the present invention. FIG. 5 is a conceptual diagram for explaining a behavior when paint leakage occurs in a conventional mold. FIG. 6 is a flowchart illustrating steps of an in-mold coating forming method. [Description of Signs] 1 Auxiliary cavity 3 Groove 5 Mold cavity 10 Movable mold 20 Fixed mold 50 Paint injection machine 51 Paint injection port 100 Mold for internal coating molding K heating element

───────────────────────────────────────────────────── フロントページの続き (72)発明者 奥迫 隆 山口県宇部市大字小串字沖の山1980番地 宇部興産株式会社宇部研究所内 (72)発明者 小林 和明 山口県宇部市大字小串字沖の山1980番地 宇部興産株式会社宇部研究所内 Fターム(参考) 4F202 AD11 AG03 CA11 CB01 CB19 CB28 CK83 CK90 4F206 AD11 AG03 AH24 AH26 JA07 JB23 JQ81 JW41    ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Takashi Okusako             1980 mountain off the coast of Kogushi, Ube City, Yamaguchi Prefecture             Ube Industries, Ltd. (72) Inventor Kazuaki Kobayashi             1980 mountain off the coast of Kogushi, Ube City, Yamaguchi Prefecture             Ube Industries, Ltd. F term (reference) 4F202 AD11 AG03 CA11 CB01 CB19                       CB28 CK83 CK90                 4F206 AD11 AG03 AH24 AH26 JA07                       JB23 JQ81 JW41

Claims (1)

【特許請求の範囲】 【請求項1】雄型と雌型により形成される金型キャビテ
ィとくいきり構造の嵌合部とを有し、該金型キャビティ
で成形した樹脂成形品の表面に該金型キャビティ内で被
覆を施すための塗料注入機を備える型内被覆成形用金型
において、当該金型の開閉方向に延在する補助キャビテ
ィを当該金型キャビティの全周にわたって設けるととも
に、該補助キャビティの被覆面側に該補助キャビティの
全周にわたって形成した溝部を設けることを特徴とする
型内被覆成形用金型。
Claims: 1. A mold having a mold cavity formed by a male mold and a female mold and a fitting portion having a drawing structure, wherein a surface of a resin molded product molded by the mold cavity is provided. In an in-mold coating molding die having a paint injection machine for applying a coating in a mold cavity, an auxiliary cavity extending in the opening and closing direction of the die is provided over the entire circumference of the die cavity. A mold for in-mold coating molding, wherein a groove formed over the entire circumference of the auxiliary cavity is provided on the coating surface side of the cavity.
JP2001393457A 2001-07-24 2001-12-26 In-mold coating mold Expired - Fee Related JP3843833B2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2001393457A JP3843833B2 (en) 2001-12-26 2001-12-26 In-mold coating mold
PCT/JP2002/007419 WO2003009985A1 (en) 2001-07-24 2002-07-23 Internally coated mold, and internal mold coating forming method
CNB028182758A CN1328031C (en) 2001-07-24 2002-07-23 Internally coated mold, and internal mold coating forming method
US10/483,263 US7309221B2 (en) 2001-07-24 2002-07-23 Internally coated mold, and internal mold coating forming method
CA2453915A CA2453915C (en) 2001-07-24 2002-07-23 Internally coated mold, and internally coating forming method
KR20047000902A KR100848171B1 (en) 2001-07-24 2002-07-23 Metal film for internal mold coating forming

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001393457A JP3843833B2 (en) 2001-12-26 2001-12-26 In-mold coating mold

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