JP3689513B2

JP3689513B2 - Injection molding simultaneous painting apparatus and method

Info

Publication number: JP3689513B2
Application number: JP35108796A
Authority: JP
Inventors: 浩之阿竹
Original assignee: Dai Nippon Printing Co Ltd
Current assignee: Dai Nippon Printing Co Ltd
Priority date: 1996-12-27
Filing date: 1996-12-27
Publication date: 2005-08-31
Anticipated expiration: 2016-12-27
Also published as: JPH10180798A

Description

【０００１】
【発明の属する技術分野】
本発明は、射出成形と同時に型内で図柄や文字等が施された絵付シートを射出樹脂成形品の表面に一体的に接着して加飾成形品（製品）を得るようにした射出成形同時絵付装置及び方法に関する。
【０００２】
【従来の技術】
射出成形と同時に射出成形樹脂成形品の表面に絵付シートを一体的に接着する射出成形同時絵付方法としては、従来より幾つもの態様が提案されているが、それらの大半は、次の（ａ）〜（ｉ）の工程の全部又は幾つかを記述順に又はその順番を入れ換えて、順次、又は複数の工程を同時に重複してもしくは並列的に行うようにされている（特公昭５０−１９１３２号、実公平３−５６３４４号、特公平７−４１６３７号公報等を参照）。
【０００３】
（ａ）絵付シートを射出成形に用いられる雌型のパーティング面上に供給するシート供給工程。
（ｂ）絵付シートを雌型のパーティング面に固定保持するクランプ工程。
（ｃ）絵付シートを熱盤等により加熱軟化させる加熱軟化工程。
（ｄ）絵付シートを真空吸引及び／又は圧空供給等により雌型のキャビティに沿わせるように延伸させる延伸工程（予備成形工程）。
【０００４】
（ｅ）雌型と雄型の一方（通常は雌型）を他方（通常は雄型）側へ移動させて型締めを行う型締め工程。
（ｆ）キャビティ内に雄型側から流動状態の樹脂（熔融樹脂）を注入充填して射出成形を行う射出成形工程。
（ｇ）雌型と雄型とを離間させる型開き工程。
（ｈ）絵付シートのうちの射出成形品に接着付随させるべき部分を他の部分（不要部分）から切り離すトリミング工程。
（ｉ）絵付シートが接着された射出成形品を前記雄雌両金型から取り出す取出工程。
【０００５】
なお、複数の工程を同時に重複して行うとは、複数の工程が一工程に含まれることをいい、例えば、前記（ｅ）の型締め工程において絵付シートを雌型と雄型との間に挟んで固定保持するようになせば、該型締め工程と同時に重複して前記（ｂ）のクランプ工程が行われたことになり、また、前記（ｆ）の射出成形工程において絵付シートを射出された熔融樹脂の熱と圧力により延伸させるようになせば、該射出成形工程と同時に重複して前記（ｄ）の延伸工程が行われたことになる場合をいう。
【０００６】
また、絵付シートとしては、製品種別に応じて貼合わせ積層シート（ラミネートシート）と転写シートのいずれかが用いられ、ラミネートシートである場合には、射出成形によりそのままで絵付けが行われたことになり、射出樹脂成形品の表面にシート全層が接着一体化して化粧層となる。それに対し、絵付シートが転写シートである場合には、射出樹脂成形品の表面に一体化した化粧シートのうちの支持体シートを剥離し、装飾層等の転写層のみを射出樹脂成形品側に残留させて化粧層となすことにより絵付けが完了する。
【０００７】
ところで、射出成形同時絵付装置においては、前記（ｄ）に記述した如くに、絵付シートを雌型のキャビティ（の底面や立ち上がり面等）に沿わせて密着させるように延伸させるべく、通常、雌型には、外部の真空発生源（パキュームポンプ等）に接続された真空吸引孔（又は真空吸引孔として働く溝やスリット状の隙間等）を形成する必要があるが、従来、前記真空吸引孔の形成態様としては下記(1) 〜(6) に記述したものが提案ないし創案されている。
【０００８】
(1) 真空吸引孔を雌型のキャビティの最も低い底面に複数カ所開口させたもの（特公昭５０−１９１３２号公報等を参照）。
(2) 図１０を参照すればよくわかるように、雌型２のキャビティの外側のパーティング面もしくは成形品外となる内側部分（成形品の窓、開口、切欠部等となる部分）のパーティング面２ａに、前記キャビティ１２を周回するように形成された環状溝１５を介して真空吸引孔１７、１７、…を開口させたもの。
【０００９】
(3) 図１１を参照すればよくわかるように、真空吸引孔１７、１７、…を雌型２のキャビティ１２の外側のパーティング面２ｂに開口させるとともに、前記真空吸引孔１７と前記キャビティ１２とを溝２２で連通させたもの（特公平７−４１６３７号公報参照）
【００１０】
(4) 図１２を参照すればよくわかるように、雌型２を複数の分割型２Ａ、２Ｂからなる入れ子構造とし、前記分割型（入れ子）２Ａ、２Ｂ相互間に真空吸引孔として働くようにスリット状の隙間２５' を形成し、該隙間２５' を前記雌型２のキャビティ１２の最も低い底面１２ａに開口させ、かつ、前記(2) と同様な真空吸引孔１７、１７、…及び環状溝１５を形成したもの（特願平７−３２４７８３号参照）。
【００１１】
(5) 図１３を参照すればよくわかるように、前記(4) と同様に、雌型２を複数の分割型２Ａ' 、２Ｂ' からなる入れ子構造とし、前記分割型（入れ子）２Ａ' 、２Ｂ' 相互間に真空吸引孔として働くようにスリット状の隙間２５' を形成し、該隙間２５' を前記雌型２のキャビティ１２の立ち上がり面１２ｂに開口させ、かつ、前記(2) と同様な真空吸引孔１７、１７、…及び環状溝１５を形成したもの。
(6) 雌型おけるキャビティ面形成部分を多孔質材料で作製したもの（実公平３−５６３４４号公報等を参照）
【００１２】
【発明が解決しようとする課題】
しかしながら、前記(1) のように真空吸引孔を雌型キャビティの底面に複数カ所開口させたものでは、絵付シートが柔薄、特に装飾部分が薄い（例えば転写シート）場合に、得られた成形品の装飾面に真空吸引孔の痕跡が残り、外観意匠、美観を損ねるおそれがあった。
【００１３】
また、前記(2) のように、真空吸引孔を雌型のキャビティ外に開口させたものでは、得られる成形品に真空吸引孔の痕跡は残らないが、真空吸引孔とキャビティとが離れるので、真空吸引効率が悪く、成形品形状によっては、キャビティ１２の立ち上がり面１２ｂ付近に空気が残留しやすく、予備成形不十分のまま射出樹脂により一気に絵付シートがキャビティ表面に向かって延伸されるため、絵付シートに皺、剥離、破れ等が発生しやすい。また、絵付シートを沿わせて密着できるキャビティの形状（深さ、Ｒ、凹凸等の限界形状）が限られる。さらに、真空吸引孔を成形品外となる内側部分（成形品の窓、開口、切欠部等となる部分）のパーティング面２ａに開口させる場合には、当然ながら得るべき成形品形状が窓、開口、切欠部等となる部分を有するものに限られ、汎用性がない。
【００１４】
前記(3) のように、真空吸引孔とキャビティとを溝で連通させたものでは、図１１を参照すればよくわかるように、前記真空吸引孔１７、１７、…を通じて真空吸引を行うと、まず、溝２２内に絵付シートＳが引っ張られて密着し、前記真空吸引孔１７、１７、…を封鎖してしまうため、期待したようには、絵付シートＳとキャビティ１２との間の空気を吸引排除できず、キャビティ１２の立ち上がり面１２ｂ付近に空気が残留しやすく、絵付シートＳに皺、剥離、破れ等が発生しやすい。
【００１５】
前記(4) のように、雌型２を入れ子構造にして、隙間２５' をキャビティ１２の最も低い底面１２ａに開口させたものでは、前記隙間２５' が広いと該隙間２５' の痕跡（入れ子跡）が成形品に残り、前記隙間２５' が狭いと、真空吸引効率が悪くなり、絵付シートＳとキャビティ１２との間の空気を充分に吸引排除できないおそれがある。また、雌型を入れ子構造にして隙間を２５' を形成するには、通常ののものに比してコストが高くつく。
【００１６】
前記(5) のように、雌型２を入れ子構造にして、隙間２５' をキャビティ１２の立ち上がり面１２ｂに開口させたものでは、前記(4) と同様に、隙間２５' の痕跡（入れ子跡）が成形品に残るおそれがあるが、該痕跡は成形品の横方向に伸びる線状のものであるので目立ちにくいという利点がある。しかしながら、得るべき成形品形状によっては、例えば、キャビティ１２の立ち上がり（深さ）Ｈが３〜５ｍｍ程度である場合等には、分割型２Ａ' のパーティング面２ａ側部分が薄くなりすぎて強度が不足するため、実用に耐えない。
【００１７】
前記(6) のように、キャビティ面形成部分を多孔質材料で作製したものでは、真空吸引孔（通路）が実質的に紆余曲折したものとなって極端に細い部分が形成されたりするので、通路抵抗が極めて大きくなり、真空吸引効率が悪い。また、型自体の力学的強度も低いものとなる。
【００１８】
本発明は、上述の如くの問題を解消すべくなされたもので、その目的とするところは、比較的容易にかつ低コストで製作できるとともに、得られる成形品の装飾面に真空吸引孔等の痕跡を残り難くして、その品質、外観意匠、美観を損なわないようにでき、かつ、真空吸引効率を向上できて、絵付シートとキャビティとの間の空気を確実に吸引排除でき、絵付シートに皺、剥離、破れ等を生じ難くできる射出成形同時絵付装置及び方法を提供することにある。
【００１９】
【課題を解決するための手段】
上述の目的を達成すべく、本発明に係る射出成形同時絵付装置は、基本的には、雌型と雄型とを備え、前記雌型のパーティング面におけるキャビティの立ち上がり面との境界となるエッジ部より所定の距離だけ離れた部位に、前記キャビティを周回するように環状溝を形成するとともに、前記環状溝に真空吸引孔を任意のピッチで開口させ、かつ、前記パーティング面における前記エッジ部と前記環状溝との間の部位に、凸部を任意のピッチで突設してなる。
【００２０】
本発明装置において、前記凸部は、前記エッジ部を含む前記パーティング面の端部に突設してもよいし、あるいは、前記エッジ部から離れた部位に突設してもよく、前記パーティング面における前記エッジ部と前記環状溝との間の部位において上方（雄型側）に突出するものであれば、その位置及び形状は問わない。
本発明装置の好ましい態様では、前記凸部は、前記環状溝及び真空吸引孔には達しない大きさに設定され、また、前記雄型のパーティング面に前記凸部が嵌め込まれる凹部が形成される。
【００２１】
本発明に係る射出成形同時絵付方法は、上記構成の射出成形同時絵付装置を使用したもので、前記雌型のパーティング面上に絵付シートを供給するシート供給工程と、前記絵付シートを前記雌型のパーティング面上に固定保持するクランプ工程と、前記絵付シートを前記雌型に形成された前記真空吸引孔を通じて真空吸引することにより前記雌型のキャビティに沿わせて密着させるように延伸させる延伸工程と、前記雌型と雄型の一方を他方側へ移動させて型締めを行う型締め工程と、前記雌型と雄型との間に形成されるキャビティ内に前記雄型側から流動状態の樹脂を注入充填して射出成形を行う射出成形工程と、前記雌型と雄型とを離間させる型開き工程と、前記絵付シートが接着された射出成形品を前記雌型から取り出す取出工程と、を含み、前記各工程を記述順に又はその順番を入れ換えて、順次、又は複数の工程を同時に重複してもしくは並列的に行うようにされる。
【００２２】
本発明に係る射出成形同時絵付装置では、前記環状溝、真空吸引孔、凸部等の各部の寸法・ピッチ等は、得るべき成形品の寸法形状、言い換えれば、雌型キャビティの寸法形状に応じて定められるが、通常は、特に、前記エッジ部と前記環状溝との離隔距離Ｌは３ｍｍ以上で１０ｍｍ程度、前記凸部の前記パーティング面に沿う方向の幅αは１ｍｍ〜５ｍｍ程度、前記凸部の高さβは０．２ｍｍ〜１ｍｍ程度、前記凸部の幅長γは１ｍｍ〜１０ｍｍ程度、前記凸部のピッチｐは１ｍｍ〜１０ｍｍ程度、に設定することが好ましい。
【００２３】
また、前記環状溝は、雌型のキャビティの外側のパーティング面だけでなく、得るべき成形品が内周部に窓、開口、切欠部等を有するものである場合には、この成形品外となる窓、開口、切欠部等となる部分（内側部分）のパーティング面にも、前記キャビティを周回するように形成する。この場合、前記環状溝としては、幅が２〜４ｍｍ程度で深さが１〜２ｍｍ程度のものが好ましく、この環状溝の底面に例えば直径が１〜２ｍｍ程度の真空吸引孔を任意のピッチ、例えば３０〜５０ｍｍの間隔をあけて穿孔することが好ましい。なお、真空吸引孔の本数（密度）を増やす程、絵付シートの各部の延伸量が均一化しやすく、また吸引速度も大きくしやすい。
【００２４】
このような構成とされた本発明の射出成形同時絵付装置及び方法にあっては、絵付シートを雌型に形成された真空吸引孔を通じて真空吸引して雌型のキャビティに沿わせて密着させる延伸工程において、前記パーティング面におけるエッジ部と環状溝との間の部位に任意のピッチで形成された凸部とそれに隣接する部分（隣接凹領域）とからなる凹凸部分の作用により、絵付シートの各部が延伸成形される時間に微妙な差が生じて、前記エッジ部付近で絵付シートに撓みが生じ、絵付シートと前記エッジ部に形成された前記凹凸部分付近との間に一時的に隙間が形成される。
【００２５】
そのため、空気溜まりが生じやすいキャビティの立ち上がり面付近の空気が前記凹凸部分付近に形成された隙間を通じて前記環状溝及び真空吸引孔に吸引され、絵付シートとキャビティとの間の空気が確実に吸引排除される。そして、さらに、前記真空吸引孔を通じての真空吸引が進むと、前記凹凸部分付近の隙間の空気も吸引されて絵付シートは前記凹凸部分付近においても延伸せしめられて前記撓みが無くされ、最終的には、絵付シートが前記凹凸部分を含むキャビティ全面及びパーティング面に隙間を生じることなく密着する。
【００２６】
このように本発明の射出成形同時絵付装置では、成形品の表面を形成するキャビティに真空吸引孔あるいは真空吸引孔として働く溝や隙間等を開口させることを要しないで、従来構成の雌型に対してそのパーティング面におけるエッジ部と環状溝との間の部位に凸部を任意のピッチで形成したという簡単な構成でありながら、真空吸引効率を向上できて、絵付シートとキャビティとの間の空気を確実に吸引排除でき、その結果、絵付シートに皺、剥離、破れ等を生じ難くできるとともに、得られる成形品の装飾面に真空吸引孔等の痕跡を残さず、したがって、その品質、外観意匠、美観を損なわないようにできる。また、型の力学的強度を低下させることもない。
【００２７】
また、本発明の射出成形同時絵付装置の他の好ましい態様では、前記構成に加えて、前記雌型が複数の分割型からなる入れ子構造とされ、前記分割型（入れ子）相互間に真空吸引孔として働くスリット状の隙間が形成され、該隙間がキャビティに開口せしめられる。
【００２８】
このように、雌型を入れ子構造にして分割型間に隙間を形成し、該隙間を真空吸引孔として働くようにキャビティに開口させるという構成を付加することにより、前記パーティング面におけるエッジ部と環状溝との間に形成された凹凸部分の作用による空気吸引排除効果に加えて、前記隙間を通じての空気吸引排除効果との相乗効果を期待できる。
【００２９】
この場合、前記凹凸部分の作用による空気吸引排除効果が得られることから、前記分割型間の隙間による空気吸引排除の負担は少なくて済む。従って、前記凹凸部分を形成していない従来の雌型（図１２）における分割型間の隙間に比して本発明の分割型間の隙間は狭くできるので、この隙間（入れ子跡）の痕跡（線状）をより目立ち難くでき、その結果、得られる成形品の品質、外観意匠、美観を一層向上させることができる。
【００３０】
本発明の射出成形同時絵付装置において、雄雌両金型は、鉄、銅等の金属あるいはセラミックス等で作製され、成形品形状等に応じて分割構成（前記した入れ子構造や中間型を有する構造）等としてもよい。また、雄型に圧空供給用の透孔等を形成してもよい。
【００３１】
また、絵付シートを雌型のキャビティ面に沿わせて密着させるように延伸させる予備成形を行う前に、絵付シートを加熱軟化させるべく、熱盤等の加熱手段を付設してもよい。熱盤は、実公平１−１０１８６号公報、特開平５−３０１２５０号公報等に開示されるような公知のものを使用できる。
【００３２】
絵付シートは、ロール状に巻き取られた長尺の連続帯状シートの状態から必要量づつ（１ショット分づつ）供給するようにしてもよいし、予め所定寸法に裁断した枚葉シートを供給するようにしてもよい。また、帯状シート（の次ショット部分）もしくは枚葉シートからなる絵付シートを対向配置された雌型と雄型との間に供給するには、巻き出し機及び巻き取り機を用いたロール／ロール方式でもよいし、前記絵付シートを吸着盤やチャック等で保持して自動搬送する方式でもよい。
【００３３】
また、絵付シートを雌型パーティング面に固定保持すべく適宜のクランプ手段を付設してもよい。クランプ手段としては、枠状のクランパー等を用いることができ、その駆動は、型締め動作等の成形用駆動力を用いたり、エジェクターピン駆動機構の動力を利用したりすることができる他、別途に流体圧アクチュエーター等の駆動手段を設けることによりなされる。
【００３４】
絵付シートは、基材シートとその上に積層された装飾層からなり、基材シートを成形品と密着一体化させたまま最終製品として使用する貼り合わせ積層シート（ラミネートシート）、あるいは一旦絵付シートと成形品とを一体化させた後、装飾層（転写層）のみを成形品側に残して基材シート（支持体シート）を剥離する転写シートのいずれも使用することができる。
【００３５】
前記積層シート用の基材シートとしては、ポリ塩化ビニル、アクリル、ポリスチレン、ＡＢＳ樹脂、ポリカーボネート、ポリエステル、ポリプロピレン等の熱可塑性樹脂を用いることができる。基材シートの厚さは、通常２０〜５００μｍ程度である。装飾層は、印刷絵柄、着色又は透明塗膜、金属薄膜等の視覚的意匠を与える層の他、硬質塗膜、防曇塗膜、導電性層等の機能性を有する層であってもよい。
【００３６】
前記転写シートは、一旦剥離性の支持体シート上に形成した絵柄層等よりなる転写層を、別の被転写体に転移させるためのもので、支持体シート上には必要に応じて離型層を設けても良く、転写層としては、剥離層、装飾層、接着剤層、等からなり、装飾層以外の層は必要に応じて選択する。装飾層としては、絵柄層、金属薄膜層（部分又は全面）あるいは硬質塗膜、防曇塗膜、導電性層等の機能性層から選ばれる。
【００３７】
支持体シートは、ポリエチレンテレフタレート、ポリブチレンテレフタレート等の線状ポリエステル、ナイロン６、ナイロン６６等の線状ポリアミド、ポリエチレン、ポリプロピレン等のポリオレフィン、ポリ塩化ビニル等、可撓性を有する熱可塑性樹脂フィルムあるいはそれらの積層体が好ましい。
【００３８】
射出成形用の樹脂としては、ＡＢＳ（アクリロニトリル・ブタジエン・スチレン共重合体）、ポリスチレン、塩化ビニル、アクリル、ポリカーボネート等の熱可塑性樹脂を加熱熔融したもの、あるいは、二液硬化型、触媒硬化型の樹脂、例えば、ポリウレタン、ポリエステル等の未硬化液等の射出成形同時絵付用として従来より知られている材料を使用でき、製品の要求物性やコスト等に応じて選定される。
【００３９】
【発明の実施の形態】
以下に図面を参照して本発明の実施の形態を詳細に説明する。
図１及び図２は、本発明に係る射出成形同時絵付装置の一実施形態の要部を示している。
【００４０】
本実施形態の射出成形同時絵付装置１は、図３に示される如くの、窓ｗを有する得るべき成形品（ここでは、車両部品）Ｐに対応した凹凸形状の雌型２と雄型３とを備え、雌型２はその底部が図示していない可動盤に固定されていて、流体圧シリンダのラムにより前記雄型３に対して接近−離隔する方向（ここでは水平方向）に進退動するようされている。
【００４１】
なお、本実施形態では、上記のように雌型２が可動型とされていて水平方向に移動するようにされているが、これに限定される訳ではなく、例えば、雄型、雌型を上下に対向配置してそれらの一方を鉛直方向に移動させる等の形態を採用することもできる。
【００４２】
前記雌型２には、図１及び図２に加えて、図１のＢ矢視付近を拡大して示す図４（各部は誇張ないし簡略化して描かれている）を参照すればよくわかるように、得るべき成形品Ｐ形状に応じた段部１２Ａ付きの凹状のキャビティ１２が形成されるとともに、前記キャビティ１２の外側のパーティング面２ｂ及び成形品外（窓ｗ）となる前記段部１２Ａのパーティング面２ａにおける、前記キャビティ１２の立ち上がり面１２ｂとの境界となるエッジ部Ｅより所定の距離Ｌだけ離れた部位に、前記キャビティ１２を周回するように環状溝１６、１５が形成されるとともに、前記環状溝Ｌに真空吸引孔１７、１７、…が任意のピッチで開口せしめられ、かつ、前記パーティング面２ａ及び２ｂにおける前記エッジ部Ｅと前記環状溝１５との間の部位、より詳細には、前記エッジ部Ｅを含む前記パーティング面２ａの端部に、前記真空吸引孔１７、１７、…及び環状溝１５、１６には達しない大きさの短角柱状の凸部２１が任意のピッチＰで形成されている。
【００４３】
前記真空吸引孔１７、１７、…は、前記雌型２の底部側に穿設された真空吸引通路１４（図２参照）及び図示していない導管を介して外部の真空ポンプに接続されている。さらに、前記雌型２の最外周のパーティング面２ｃには、前記キャビティ１２の外周縁を周回するように、Ｏリング１９の装着溝１８が形成されている。前記Ｏリング１９は、後述する枠状のクランパー７が、間に絵付シートＳを挟んで雌型２のパーティング面２ｃに押し付けられた際、前記キャビティ１２と外部とを気密的に遮断する役目を果たす。
【００４４】
一方、図２に示す如く、前記雄型３は、射出成形機のノズルが装着される固定盤（図示省略）に固定されており、この雄型３には、その中央に前記成形品形状に対応した段付き凸部（コア）４が突設されるとともに、前記射出成形機のノズルからの熔融樹脂を前記雌型２のキャビティ１２内に注入充填するための二股状に分岐する湯道（ランナー）５が形成されている。
【００４５】
前記雄型３の前面の内周部、中間部、外周部は、それぞれ間に絵付シートＳを挟んで前記雌型２のパーティング面２ａ、２ｂ、２ｃに対接するパーティング面３ａ、３ｂ、３ｃとなっており、前記雄型３のパーティング面３ａには、図６に型締状態で示されているように、前記雌型２に設けられた凸部２１が絵付シートＳが被着された状態で密着嵌合せしめられる嵌合凹部３１が形成されている。
【００４６】
また、前記雌型２には、絵付シートＳをそのパーティング面２ｃに押圧固定するための矩形枠状のクランパー７が付設されている。このクランパー７は、図１に示す如く、雌型２の四隅近くに設けられた貫通穴８に摺動自在に嵌挿された４本の連結ロッド９によって図示していない駆動機構により雌型２のパーティング面２ｃに対して垂直方向に進退動できるようになっている。なお、前記雄型３には、図２に示される如くの型締め状態において前記クランパー７が絵付シートＳに対する押圧固定状態を解除する離間動作を行い得る深さを持った溝状凹部６が穿設されている。
【００４７】
上記のような構成とされた本実施形態の射出成形同時絵付装置１においては、以下の工程順で射出成形同時絵付を行う。すなわち、雌型２のパーティング面２ａ、２ｂ、２ｃ上に絵付シートＳを供給するシート供給工程、前記枠状のクランパー７により前記絵付シートＳを前記雌型２のパーティング面２ｃ上に押圧保持するクランプ工程、図示していない熱盤により前記押圧保持された絵付シートＳを加熱軟化させる加熱軟化工程、加熱軟化された絵付シートＳを前記雌型２に形成された前記環状溝１５、１６及び真空吸引孔１７、１７、…を通じて真空吸引することにより前記雌型２のキャビティ１２に沿わせて密着させるように延伸させる延伸工程、前記雌型２を雄型３側へ移動させて型締めを行う型締め工程、前記雌型２と雄型３との間に形成されるキャビティ１２内に前記雄型３の湯道５から熔融状態又は未硬化液状の射出成形用の樹脂を注入充填して射出成形を行う射出成形工程、前記雌型２と雄型３とを離間させる型開き工程、及び、前記絵付シートＳが一体的に接着された成形品Ｐを前記雌型２から取り出す取出工程。
【００４８】
そして、本実施形態の射出成形同時絵付装置１においては、絵付シートＳを雌型２に形成された前記環状溝１５、１６及び真空吸引孔１７、１７、…を通じて真空吸引して雌型２のキャビティ１２に沿わせて密着させる前記延伸工程において、図４及び図５（各部は誇張ないし簡略化して描かれている）を参照すればよくわかるように、パーティング面２ａとキャビティ１２の内周側の立ち上がり面１２ｂとの境界となるエッジ部Ｅに任意のピッチｐで形成された凸部２１とそれに隣接する部分（凹領域２０）とからなる凹凸部分２０、２１、２０、２１、…の作用により、絵付シートＳの各部が延伸成形される時間に微妙な差が生じて、前記エッジ部Ｅ付近で絵付シートＳに撓みが生じ、図５（Ａ）、（Ｂ）に示す如く、絵付シートＳと前記凹凸部分２０、２１、２０、２１、…付近との間に一時的に隙間Ｄが形成される。
【００４９】
そのため、空気溜まりが生じやすいキャビティ１２の立ち上がり面１２ｂ付近の空気が前記凹凸部分２０、２１、２０、２１、…付近に形成された隙間Ｄを通じて前記環状溝１５、１６及び真空吸引孔１７、１７、…に吸引され、絵付シートＳとキャビティ１２との間の空気が確実に吸引排除される。そして、さらに、前記真空吸引孔１７、１７、…を通じての真空吸引が進むと、前記凹凸部分２０、２１、２０、２１、…の隙間Ｄの空気も吸引されて絵付シートＳは前記凹凸部分２０、２１、２０、２１、…付近においても延伸せしめられて前記撓みが無くされ、最終的には、図５（Ｃ）に示される如くに、絵付シートＳが前記凹凸部分２０、２１、２０、２１、…を含むキャビティ１２全面及びパーティング面２ａ、２ｂ、２ｃに隙間を生じることなく密着する。
【００５０】
このように本実施形態の射出成形同時絵付装置１では、キャビティ１２に真空吸引孔あるいは真空吸引孔として働く溝や隙間等を開口させることを要しないで、従来構成の雌型に対してそのパーティング面２ａとキャビティの立ち上がり面１２ｂとの境界となるエッジ部Ｅと環状溝１５及び１６との間に凸部２１を任意のピッチで形成したという簡単な構成でありながら、真空吸引効率を向上できて、絵付シートＳとキャビティ１２との間の空気を確実に吸引排除でき、その結果、絵付シートＳに皺、剥離、破れ等を生じ難くできるとともに、得られる成形品Ｐの装飾面に真空吸引孔等の痕跡を残さず、したがって、その品質、外観意匠、美観を損なわないようにできる。
【００５１】
このような作用効果を確認すべく、前記構成の射出成形同時絵付装置１の雌型２における環状溝１５、真空吸引孔１７、１７、…、凹凸部分２０、２１、２０、２１、…等の各部の寸法・ピッチ等を下記〔寸法形状〕に記載のように具体的に設定し、比較例として、前記した図１０に示される如くの、前記凹凸部分２０、２１、２０、２１、…は設けられていないが、本発明装置１と同様に、雌型２のキャビティの内側のパーティング面２ａに、前記キャビティ１２を周回するように形成された環状溝１５を介して真空吸引孔１７、１７、…を開口させたもの（比較例Ｉ）と、前記した図１２に示される如くの、前記凹凸部分２０、２１、２０、２１、…は設けられていないが、雌型２を複数の分割型２Ａ、２Ｂからなる入れ子構造とし、前記分割型（入れ子）２Ａ、２Ｂ相互間に真空吸引孔として働くようにスリット状の隙間２５' （１００μ）を形成し、該隙間２５' を前記雌型２のキャビティ１２の最も低い底面１２ａにおける、コーナー部のアール（Ｒ＝０．５ｍｍ）のエンド部から３ｍｍ程度離れた位置に開口させ、かつ、前記と同様な真空吸引孔１７、１７、…及び環状溝１５を形成したもの（比較例II）を用意して、下記〔射出成形同時絵付条件〕に記載した同一条件下で比較試験を行い、下記〔結果〕に記載した如くの結果が得られた。
【００５２】
〔寸法形状〕
図４を参照すればよくわかるように、前記エッジ部Ｅと前記環状溝１５との離隔距離Ｌを４ｍｍに設定し、前記凸部２１を短角柱形として、そのパーティング面２ａに沿う方向の幅αを１ｍｍ、そのキャビティ１２の立ち上がり面１２ｂに沿う方向の高さβを０．３ｍ、その幅長γを１ｍｍ、及び前記凸部２１のピッチｐ（前記凹領域２０の幅長と同）を３．５ｍｍに設定し、また、前記環状溝１５の幅Ｆを３ｍｍ、その深さｄを１ｍｍに設定し、前記真空吸引孔１７、１７、…の孔径を１．５ｍｍ、そのピッチを３０ｍｍに設定した。また、キャビティ１２の立ち上がり面１２ｂの高さＨ（図４）は４ｍｍ、底面１２ａの幅は１２ｍｍとした。
【００５３】
〔射出成形同時絵付条件〕
▲１▼絵付シートＳとして、アクリル製の基材シート（厚みは１２５μ）とその上に印刷積層された木目模様の装飾層（アクリル樹脂と塩化ビニル酢酸ビニル系樹脂との混合物）と接着剤層（塩化ビニル酢酸ビニル系樹脂）とからなり、基材シートを成形品（射出樹脂成形物）と密着一体化させたまま最終製品として使用する貼り合わせ積層シート（ラミネートシート）を用いた。
【００５４】
▲２▼前記した加熱延伸工程における熱盤による絵付シートＳの加熱時間及び加熱温度を、それぞれ約６秒、約１３０度Ｃとし、また、前記真空吸引孔１７、１７、…を通じての真空吸引時間を約４秒とした。
▲３▼射出成形樹脂として耐熱性ＡＢＳを用い、成形温度を約２５０度Ｃ、金型温度を約６０度Ｃとした。
【００５５】
〔結果〕
(1) 本発明装置１では、絵付シートＳに皺、剥離、破れ等が無く、装飾部分には真空吸引孔等の痕跡もなく、また、前記凹凸部分２０、２１、２０、２１、…もほとんど目立たない良好な成形品Ｐが得られた。
(2) 比較例Ｉでは、得られた成形品は、エッジ部Ｅ付近に皺、剥離、破れ等があり、外観上、商品としては使用できないものであった。
(3) 比較例IIでは、絵付シートＳに皺、剥離、破れ等は無いが、分割形２Ａ' と２Ｂ' （入れ子）の隙間２５' の線状痕跡ができていた。
【００５６】
図７は、他の実施形態の雌型２の要部を示す。図示の雌型２は、前記した実施形態の雌型２の構成に加えて、該雌型２が複数の分割型２Ａ、２Ｂからなる入れ子構造とされ、前記分割型（入れ子）２Ａ、２Ｂ相互間に真空吸引孔として働くスリット状の隙間２５が形成され、該隙間２５がキャビティ１２の最も低い底面１２ａにおける、コーナー部のアール（Ｒ＝０．５ｍｍ）のエンド部から約０．３ｍｍ程度離れた位置に開口させた構成を付加したものである。なお、間隙２５の幅は３０μｍとした。
【００５７】
このように、雌型２を入れ子構造にして分割型２Ａ、２Ｂ間に隙間２５を形成し、該隙間２５を真空吸引孔として働くようにキャビティ１２の特定位置に開口させるという構成を付加することにより、前記エッジ部Ｅに形成された凹凸部分２０、２１、２０、２１、…の作用による空気吸引排除効果に加えて、前記隙間２５を通じての空気吸引排除効果を期待できる。
【００５８】
この場合、前記凹凸部分２０、２１、２０、２１、…の作用による空気吸引排除効果が得られることから、前記分割型２Ａ、２Ｂ間の隙間２５による空気吸引排除の負担は少なくて済む。従って、前記凹凸部分２０、２１、２０、２１、…を形成していない前記した従来の雌型（図１２）における分割型２Ａ、２Ｂ間の隙間２５' に比して本発明の分割型２Ａ、２Ｂ間の隙間２５は狭くできるので、この隙間（入れ子跡）２５の線状痕跡をより目立ち難くでき、その結果、得られる成形品の品質、外観意匠、美観を一層向上させることができる。
【００５９】
図８は、本発明の他の別の実施形態の雌型２についてのエッジ部Ｅ近傍の要部を示す。この形態では、凸部２１は、前記エッジ部Ｅ及び環状溝１５の両方から離れた部位、言い換えれば、前記パーティング面２ａにおけるエッジ部Ｅと環状溝１５との間の領域（２０）の中間部に突設されており、前記環状溝１５に沿う方向の長さγが図４、図５に図示したものより長くされている。他の緒元は図４、図５に図示した形態と同様である。この形態の利点は、図４、図５の形態に比べて凹凸部分２０、２１、２０、２１、…の形状が成形品に賦型されにくいという点にある。もちろん、凸部２１の寸法はこの図のものに限定されるわけではなく、α＝β、α＞β（α、β、γの定義は図４と同様）としてもよい。
【００６０】
なお、図９を参照すればよくわかるように、上記のような凸部２１を雌型のパーティング面２ａ又はパーティング面２ｃにおけるエッジ部Ｅと環状溝１５、１６との間に突設する場合には、雄型３に、前記凸部２１が嵌め込まれる凹部３１を形成する必要がある。ここで、前記した図２及び図９（Ａ）に示される如くに、前記パーティング面２ａ又は２ｃに隣接して段差を形成するように中間パーティング面２ｂが設けられている場合には、前記雄型３には、その前面の内周部、中間部、外周部に、それぞれ間に絵付シートＳを挟んで前記雌型２のパーティング面２ａ、２ｂ、２ｃに対接するパーティング面３ａ、３ｂ、３ｃが形成される。この場合、前記凸部２１が嵌め込まれる凹部３１は、雄型３及び雌型２にそれぞれキャビティ１２を密封する中間パーティング面３ｂ及び２ｂが設けられている関係上、前記凸部２１よりも大きな、それに隣接する凹領域２０も含むくらいの大きさの凹部３１が形成される。
【００６１】
それに対し、図９（Ｂ）に示される如くに、雄型３及び雌型２にそれぞれ中間パーティング面３ｂ及び２ｂが設けられていない場合には、キャビティ１２の密封を確実にするため、絵付シートＳが被着された状態の凸部２１に密着嵌合せしめられる凹部３１が形成される。
【００６２】
【発明の効果】
以上の説明から理解されるように、本発明に係る射出成形同時絵付装置及び方法によれば、キャビティに真空吸引孔あるいは真空吸引孔として働く溝や隙間等を開口させることを要しないで、従来構成の雌型に対して前記パーティング面におけるエッジ部と環状溝との間に凸部を任意のピッチで突設したという簡単な構成でありながら、真空吸引効率を向上できて、絵付シートとキャビティとの間の空気を確実に吸引排除でき、その結果、絵付シートに皺、剥離、破れ等を生じ難くできるとともに、得られる成形品の装飾面に真空吸引孔等の痕跡を残さず、したがって、その品質、外観意匠、美観を損なわないようにできるという優れた効果が得られる。また、型の力学的強度を低下させることもない。
【図面の簡単な説明】
【図１】本発明に係る射出成形同時絵付装置の一実施形態の雌型の要部を示す概略斜視図。
【図２】図１に示される装置の雌型と雄型とを型締め状態で示す拡大中央横断面図。
【図３】図１に示される装置により得るべき成形品を示し、（Ａ）は平面図、（Ｂ）は（Ａ）の拡大縦断面図。
【図４】図１のＢ矢視付近を拡大して示し、（Ａ）は要部拡大斜視図、（Ｂ）は（Ａ）のＸ矢視切欠図、（Ｃ）は（Ｂ）のＹ−Ｙ矢視線に従う断面図。
【図５】図１及び図２に示される装置の作用効果の説明に供されるもので、（Ａ）及び（Ｂ）は前記図１のＢ矢視付近を絵付シートと共に拡大して示す要部拡大断面図、（Ｃ）は前記図１のＢ矢視付近に絵付シートが接着された状態を拡大して示す要部拡大断面図。
【図６】図１に示される装置の雌型と雄型とを型締め状態で示す要部縦断面図。
【図７】本発明に係る射出成形同時絵付装置の他の実施形態の雌型の要部を示す断面図。
【図８】本発明に係る射出成形同時絵付装置の他の別の実施形態の雌型の要部を示す断面図。
【図９】図７の実施形態に備えられる雌型と雄型の構造説明に供される要部縦断面図。
【図１０】従来例(2) 及び比較例Ｉの射出成形同時絵付装置の雌型の要部を示す断面図。
【図１１】従来例(3) の射出成形同時絵付装置の雌型の要部を示す断面図。
【図１２】従来例(4) 及び比較例IIの射出成形同時絵付装置の雌型の要部を示す断面図。
【図１３】従来例(5) の射出成形同時絵付装置の雌型の要部を示す断面図。
【符号の説明】
Ｓ絵付シート
１射出成形同時絵付装置
２雌型
２ａ、２ｂ、２ｃパーティング面
３雄型
３ａ、３ｂ、３ｃパーティング面
１２キャビティ
１２ａ底面
１２ｂ立ち上がり面
１５、１６環状溝
１７真空吸引孔
２０凹領域
２１凸部
Ｅエッジ部[0001]
BACKGROUND OF THE INVENTION
The present invention is a simultaneous injection molding in which a decorative sheet (product) is obtained by integrally bonding a picture sheet with a pattern, characters, etc. in the mold to the surface of the injection resin molding simultaneously with the injection molding. The present invention relates to a painting apparatus and method.
[0002]
[Prior art]
Several methods have been proposed in the past as injection molding simultaneous painting methods in which a painting sheet is integrally bonded to the surface of an injection molded resin molded product at the same time as injection molding. Most of them have been proposed in the following (a). All or some of the steps (i) to (i) are performed in the order of description or the order thereof, and the steps are performed sequentially, or a plurality of steps are simultaneously overlapped or performed in parallel (Japanese Patent Publication No. 50-19132, No. 3-56344, JP-B-7-41637, etc.).
[0003]
(A) A sheet supplying step of supplying a picture-attached sheet onto a female parting surface used for injection molding.
(B) A clamping step of fixing and holding the picture-attached sheet on the female parting surface.
(C) A heating and softening process in which the picture sheet is softened by heating with a hot platen or the like.
(D) A stretching process (preliminary molding process) in which the picture sheet is stretched along the female cavity by vacuum suction and / or compressed air supply.
[0004]
(E) A mold clamping step in which one of the female mold and the male mold (usually female mold) is moved to the other (usually male mold) side to perform mold clamping.
(F) An injection molding process in which injection molding is performed by injecting and filling a fluid resin (molten resin) into the cavity from the male mold side.
(G) A mold opening step for separating the female mold and the male mold.
(H) A trimming step in which a part of the picture sheet to be attached to the injection molded product is separated from other parts (unnecessary parts).
(I) A step of taking out the injection molded product to which the picture sheet is adhered from both the male and female molds.
[0005]
In addition, performing a plurality of processes simultaneously and overlapping means that a plurality of processes are included in one process. For example, in the mold clamping process of (e), a picture sheet is placed between a female mold and a male mold. If sandwiched and held, the clamping step (b) was performed at the same time as the mold clamping step, and the picture sheet was injected in the injection molding step (f). If the resin is stretched by the heat and pressure of the molten resin, it refers to the case where the stretching step (d) is performed simultaneously with the injection molding step.
[0006]
In addition, as a sheet with a picture, either a laminated sheet (laminate sheet) or a transfer sheet is used depending on the product type. In the case of a laminate sheet, the picture was painted as it was by injection molding. Thus, the entire layer of the sheet is bonded and integrated on the surface of the injection resin molded product to form a decorative layer. In contrast, when the picture sheet is a transfer sheet, the support sheet of the decorative sheet integrated on the surface of the injection resin molded product is peeled off, and only the transfer layer such as a decorative layer is placed on the injection resin molded product side. Painting is completed by leaving it as a makeup layer.
[0007]
By the way, in the injection molding simultaneous painting apparatus, as described in the above (d), a female sheet is usually stretched so that the painting sheet is stretched so as to be in close contact with the female cavity (the bottom surface, the rising surface, etc.). The mold must be provided with a vacuum suction hole (or a groove or slit-like gap that acts as a vacuum suction hole) connected to an external vacuum generation source (such as a vacuum pump). As the formation mode of the holes, those described in the following (1) to (6) have been proposed or created.
[0008]
(1) A plurality of vacuum suction holes opened on the lowest bottom surface of the female cavity (see Japanese Patent Publication No. 50-19132).
(2) As can be understood by referring to FIG. 10, the parting surface outside the cavity of the female mold 2 or the inner part outside the molded product (the part that becomes the window, opening, notch, etc. of the molded product) The vacuum suction holes 17, 17,... Are opened on the ring surface 2 a through the annular groove 15 formed so as to go around the cavity 12.
[0009]
(3) As can be understood with reference to FIG. 11, the vacuum suction holes 17, 17,... Are opened in the parting surface 2 b outside the cavity 12 of the female mold 2, and the vacuum suction hole 17 and the cavity 12 are opened. In communication with the groove 22 (see Japanese Patent Publication No. 7-41637)
[0010]
(4) As can be clearly understood with reference to FIG. 12, the female mold 2 has a nested structure composed of a plurality of divided molds 2A and 2B so that it functions as a vacuum suction hole between the divided molds (nested) 2A and 2B. A slit-like gap 25 'is formed, the gap 25' is opened at the lowest bottom surface 12a of the cavity 12 of the female mold 2, and the vacuum suction holes 17, 17,. A groove 15 is formed (see Japanese Patent Application No. 7-324783).
[0011]
(5) As can be clearly understood with reference to FIG. 13, the female mold 2 has a nested structure composed of a plurality of split molds 2A ′ and 2B ′, and the split mold (nested) 2A ′, 2B ′, a slit-like gap 25 ′ is formed so as to function as a vacuum suction hole between the two, and the gap 25 ′ is opened on the rising surface 12b of the cavity 12 of the female mold 2 and the same as (2) above. Formed with various vacuum suction holes 17, 17,... And an annular groove 15.
(6) A cavity surface forming portion in a female mold made of a porous material (see Japanese Utility Model Publication No. 3-56344, etc.)
[0012]
[Problems to be solved by the invention]
However, when a plurality of vacuum suction holes are opened at the bottom of the female cavity as described in (1) above, the molded sheet obtained is obtained when the picture sheet is soft, especially when the decorative part is thin (for example, a transfer sheet). There was a possibility that the trace of the vacuum suction hole remained on the decorative surface of the product, and the appearance design and aesthetic appearance were impaired.
[0013]
In addition, when the vacuum suction hole is opened outside the female cavity as described in (2) above, no trace of the vacuum suction hole remains in the obtained molded product, but the vacuum suction hole and the cavity are separated. The vacuum suction efficiency is poor, and depending on the shape of the molded product, air tends to remain in the vicinity of the rising surface 12b of the cavity 12, and the pre-molded sheet is stretched toward the cavity surface all at once by the injection resin, Peeling, peeling, tearing, etc. are likely to occur on the sheet with pictures. Moreover, the shape of the cavity (depth shape such as depth, R, unevenness, etc.) that can be brought into close contact with the picture sheet is limited. Further, when the vacuum suction hole is opened on the parting surface 2a of the inner portion (portion of the molded product, the opening, the cutout portion, etc.) outside the molded product, the molded product shape to be obtained is naturally a window, It is limited to those having a part that becomes an opening, a notch or the like, and is not versatile.
[0014]
In the case where the vacuum suction hole and the cavity communicate with each other as in (3) above, as can be understood with reference to FIG. 11, when vacuum suction is performed through the vacuum suction holes 17, 17,. First, since the picture sheet S is pulled into close contact with the groove 22 and seals the vacuum suction holes 17, 17,..., As expected, the air between the picture sheet S and the cavity 12 is removed. The suction cannot be eliminated, air tends to remain in the vicinity of the rising surface 12b of the cavity 12, and the picture sheet S is likely to be wrinkled, peeled off, torn or the like.
[0015]
As in the above (4), in the case where the female mold 2 has a nested structure and the gap 25 'is opened in the lowest bottom surface 12a of the cavity 12, if the gap 25' is wide, the trace (nesting) of the gap 25 ' If the mark 25 remains in the molded product and the gap 25 'is narrow, the vacuum suction efficiency is deteriorated, and the air between the picture sheet S and the cavity 12 may not be sufficiently sucked out. In addition, in order to form a female mold in a nested structure and form a gap 25 ', the cost is higher than that of a normal one.
[0016]
As in the above (5), in the case where the female mold 2 has a nested structure and the gap 25 ′ is opened in the rising surface 12b of the cavity 12, the trace (nested trace) of the gap 25 ′ is similar to the above (4). ) May remain in the molded product, but the traces are linear because they extend in the lateral direction of the molded product, so that there is an advantage that they are not noticeable. However, depending on the shape of the molded product to be obtained, for example, when the rising (depth) H of the cavity 12 is about 3 to 5 mm, the parting surface 2a side portion of the split mold 2A ′ becomes too thin and the strength is increased. Insufficient for practical use.
[0017]
In the case where the cavity surface forming part is made of a porous material as in (6), the vacuum suction hole (passage) is substantially twisted and an extremely thin part is formed. The passage resistance becomes extremely large and the vacuum suction efficiency is poor. In addition, the mechanical strength of the mold itself is low.
[0018]
The present invention has been made to solve the above-described problems, and the object of the present invention is that it can be manufactured relatively easily and at low cost, and a vacuum suction hole or the like is provided on the decorative surface of the obtained molded product. The traces are less likely to remain, the quality, appearance design, and aesthetics are not impaired, and the vacuum suction efficiency can be improved, so that the air between the picture sheet and the cavity can be reliably sucked out. An object of the present invention is to provide an injection molding simultaneous painting apparatus and method which can hardly cause wrinkles, peeling, tearing and the like.
[0019]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the injection molding simultaneous painting apparatus according to the present invention basically includes a female mold and a male mold, and serves as a boundary between the rising surface of the cavity on the parting surface of the female mold. An annular groove is formed to circulate around the cavity at a predetermined distance from the edge portion, and vacuum suction holes are opened at an arbitrary pitch in the annular groove, and the edge on the parting surface Convex portions are projected at an arbitrary pitch at a portion between the portion and the annular groove.
[0020]
In the device according to the present invention, the convex portion may protrude from an end portion of the parting surface including the edge portion, or may protrude from a portion away from the edge portion. As long as it protrudes upward (male side) at a portion between the edge portion and the annular groove on the ring surface, its position and shape are not limited.
In a preferred aspect of the device of the present invention, the convex portion is set to a size that does not reach the annular groove and the vacuum suction hole, and a concave portion is formed into which the convex portion is fitted into the male parting surface. The
[0021]
An injection molding simultaneous painting method according to the present invention uses the injection molding simultaneous painting apparatus having the above-described configuration, and includes a sheet supply step of supplying a painting sheet on the female parting surface, and Clamping process for fixing and holding on the parting surface of the mold, and drawing the sheet with vacuum through the vacuum suction hole formed in the female mold so as to be closely attached along the cavity of the female mold A stretching process, a clamping process in which one of the female mold and the male mold is moved to the other side to perform clamping, and flow from the male mold side into a cavity formed between the female mold and the male mold An injection molding process for injecting and filling the resin in a state to perform injection molding, a mold opening process for separating the female mold and the male mold, and an extraction process for taking out the injection molded product to which the picture sheet is bonded from the female mold When, Wherein said each step is interchanged or the order in description order, sequentially, or a plurality of steps concurrently to perform duplicate or in parallel.
[0022]
In the injection molding simultaneous painting apparatus according to the present invention, the size / pitch of each part such as the annular groove, the vacuum suction hole, and the convex part depends on the dimensional shape of the molded product to be obtained, in other words, the dimensional shape of the female cavity. In general, in particular, the separation distance L between the edge portion and the annular groove is about 3 mm or more and about 10 mm, and the width α of the convex portion along the parting surface is about 1 mm to 5 mm. It is preferable to set the height β of the convex portion to about 0.2 mm to 1 mm, the width γ of the convex portion to about 1 mm to 10 mm, and the pitch p of the convex portion to about 1 mm to 10 mm.
[0023]
The annular groove is not only the parting surface on the outside of the female cavity, but also when the molded product to be obtained has a window, an opening, a notch, etc. on the inner periphery. Also, the cavity is formed around the parting surface of the portion (inner portion) that becomes the window, opening, notch, and the like. In this case, the annular groove preferably has a width of about 2 to 4 mm and a depth of about 1 to 2 mm. A vacuum suction hole having a diameter of about 1 to 2 mm, for example, has an arbitrary pitch on the bottom surface of the annular groove. For example, it is preferable to perforate at intervals of 30 to 50 mm. As the number (density) of the vacuum suction holes is increased, the stretch amount of each part of the picture sheet is easily made uniform, and the suction speed is easily increased.
[0024]
In the injection molding simultaneous painting apparatus and method of the present invention having such a configuration, the drawing sheet is vacuum-drawn through a vacuum suction hole formed in the female mold and is stretched so as to adhere to the female cavity. In the process, due to the action of the concavo-convex part consisting of the convex part formed at an arbitrary pitch in the part between the edge part and the annular groove on the parting surface and the part adjacent thereto (adjacent concave area), There is a subtle difference in the time that each part is stretch-molded, the picture sheet is bent near the edge part, and there is a temporary gap between the picture sheet and the uneven part formed near the edge part. It is formed.
[0025]
Therefore, air near the rising surface of the cavity, where air accumulation is likely to occur, is sucked into the annular groove and the vacuum suction hole through the gap formed near the uneven portion, and the air between the picture sheet and the cavity is reliably sucked out. Is done. Further, when the vacuum suction through the vacuum suction hole proceeds, the air in the gap near the uneven portion is also sucked, the picture sheet is stretched also near the uneven portion, and the bending is finally eliminated. Is in close contact with the entire cavity surface including the uneven portion and the parting surface without causing a gap.
[0026]
Thus, in the injection molding simultaneous painting apparatus of the present invention, it is not necessary to open a vacuum suction hole or a groove or gap serving as a vacuum suction hole in the cavity forming the surface of the molded product. On the other hand, the vacuum suction efficiency can be improved while the convex part is formed at an arbitrary pitch at the part between the edge part and the annular groove on the parting surface. As a result, it is possible to make it difficult to cause wrinkles, peeling, tearing, etc. on the picture sheet, and to leave no traces such as vacuum suction holes on the decorative surface of the resulting molded product, so its quality, The appearance design and aesthetic appearance can be kept intact. Further, the mechanical strength of the mold is not lowered.
[0027]
In another preferable aspect of the injection molding simultaneous painting apparatus of the present invention, in addition to the above configuration, the female mold has a nested structure including a plurality of divided molds, and a vacuum suction hole is provided between the divided molds (nested). A slit-like gap is formed, and the gap is opened in the cavity.
[0028]
In this way, by adding a configuration in which the female mold is nested and a gap is formed between the divided molds, and the gap is opened in the cavity so as to function as a vacuum suction hole, In addition to the air suction elimination effect due to the action of the uneven portions formed between the annular grooves, a synergistic effect with the air suction elimination effect through the gap can be expected.
[0029]
In this case, since the air suction elimination effect by the action of the uneven portion can be obtained, the burden of air suction exclusion due to the gap between the divided molds can be reduced. Accordingly, since the gap between the split molds of the present invention can be narrower than the gap between the split molds in the conventional female mold (FIG. 12) that does not form the uneven portion, the trace of this gap (nested trace) ( (Linear shape) can be made more inconspicuous, and as a result, the quality, appearance design, and aesthetics of the obtained molded product can be further improved.
[0030]
In the injection molding simultaneous painting apparatus of the present invention, the male and female molds are made of metal such as iron or copper or ceramics, and are divided according to the shape of the molded product (structure having the above-described nesting structure or intermediate mold) ) Etc. Further, a through hole or the like for supplying compressed air may be formed in the male mold.
[0031]
In addition, heating means such as a hot platen may be provided to preheat the picture sheet so as to heat and soften the picture sheet before performing preforming so that the picture sheet is stretched in close contact with the cavity surface of the female mold. As the hot platen, known ones as disclosed in Japanese Utility Model Publication No. 1-10186, Japanese Patent Laid-Open No. 5-301250, and the like can be used.
[0032]
The picture sheet may be supplied in a necessary amount (for one shot) from the state of a long continuous belt-like sheet wound up in a roll shape, or a sheet sheet cut in advance to a predetermined size is supplied. You may do it. In addition, a roll / roller using a winder and a winder is used to supply a belt-like sheet (next shot part) or a sheet with a picture made of a single sheet between a female mold and a male mold arranged opposite to each other. A method may be used, or a method in which the picture sheet is automatically conveyed while being held by a suction disk or a chuck.
[0033]
Further, an appropriate clamping means may be provided to fix and hold the picture sheet on the female parting surface. As the clamping means, a frame-shaped clamper or the like can be used, and its driving can be performed using a driving force for molding such as a clamping operation or the power of the ejector pin driving mechanism. This is done by providing a driving means such as a fluid pressure actuator.
[0034]
A picture sheet consists of a base sheet and a decorative layer laminated on the base sheet. A laminated sheet (laminate sheet) that is used as a final product while the base sheet is closely integrated with a molded product, or a picture sheet once Any of the transfer sheets that peel off the base sheet (support sheet) leaving only the decorative layer (transfer layer) on the molded product side can be used.
[0035]
As the base sheet for the laminated sheet, thermoplastic resins such as polyvinyl chloride, acrylic, polystyrene, ABS resin, polycarbonate, polyester, and polypropylene can be used. The thickness of a base material sheet is about 20-500 micrometers normally. The decorative layer may be a layer having functionality such as a hard coating, an anti-fogging coating, or a conductive layer in addition to a layer that gives a visual design such as a printed pattern, a colored or transparent coating, or a metal thin film. .
[0036]
The transfer sheet is for transferring a transfer layer composed of a pattern layer or the like once formed on a peelable support sheet to another transfer target, and is released on the support sheet as necessary. A layer may be provided, and the transfer layer includes a release layer, a decoration layer, an adhesive layer, and the like, and a layer other than the decoration layer is selected as necessary. The decorative layer is selected from a functional layer such as a pattern layer, a metal thin film layer (part or whole surface), a hard coating film, an antifogging coating film, and a conductive layer.
[0037]
The support sheet is made of a flexible thermoplastic resin film such as a linear polyester such as polyethylene terephthalate or polybutylene terephthalate, a linear polyamide such as nylon 6 or nylon 66, a polyolefin such as polyethylene or polypropylene, a polyvinyl chloride, or the like. Those laminates are preferred.
[0038]
Injection molding resins include ABS (acrylonitrile / butadiene / styrene copolymer), polystyrene, vinyl chloride, acrylic, polycarbonate and other thermoplastic resins that are heated and melted, or two-component curing type and catalyst curing type. Conventionally known materials for simultaneous injection molding of resin, for example, uncured liquid such as polyurethane and polyester can be used, and are selected according to the required physical properties and cost of the product.
[0039]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG.1 and FIG.2 has shown the principal part of one Embodiment of the injection molding simultaneous painting apparatus based on this invention.
[0040]
The injection molding simultaneous painting apparatus 1 of the present embodiment includes an uneven female die 2 and a male die 3 corresponding to a molded product (here, a vehicle part) P that should have a window w as shown in FIG. The bottom of the female die 2 is fixed to a movable plate (not shown), and moves forward and backward in a direction approaching and separating from the male die 3 by a ram of a fluid pressure cylinder (here, a horizontal direction). It has been.
[0041]
In this embodiment, the female mold 2 is movable as described above and moves in the horizontal direction. However, the present invention is not limited to this. For example, a male mold and a female mold are used. It is also possible to adopt a form such as arranging them vertically opposite to each other and moving them in the vertical direction.
[0042]
In addition to FIGS. 1 and 2, the female mold 2 can be understood by referring to FIG. 4 (the parts are exaggerated or simplified) shown in an enlarged view in the vicinity of the arrow B in FIG. 1. In addition, a concave cavity 12 with a step 12A corresponding to the shape of the molded product P to be obtained is formed, and the step 12A that is outside the parting surface 2b of the cavity 12 and outside the molded product (window w). In the parting surface 2a, annular grooves 16 and 15 are formed so as to go around the cavity 12 at a predetermined distance L from the edge portion E which becomes the boundary with the rising surface 12b of the cavity 12. , And vacuum suction holes 17, 17,... Are opened in the annular groove L at an arbitrary pitch, and the part between the edge E and the annular groove 15 on the parting surfaces 2 a and 2 b. More specifically, a short columnar convex part having a size that does not reach the vacuum suction holes 17, 17, and the annular grooves 15, 16 at the end part of the parting surface 2 a including the edge part E. 21 is formed at an arbitrary pitch P.
[0043]
The vacuum suction holes 17, 17,... Are connected to an external vacuum pump through a vacuum suction passage 14 (see FIG. 2) drilled on the bottom side of the female mold 2 and a conduit (not shown). . Further, a mounting groove 18 for an O-ring 19 is formed on the outermost parting surface 2 c of the female die 2 so as to go around the outer peripheral edge of the cavity 12. The O-ring 19 has a function of hermetically blocking the cavity 12 from the outside when a frame-shaped clamper 7 described later is pressed against the parting surface 2c of the female mold 2 with the picture sheet S interposed therebetween. Fulfill.
[0044]
On the other hand, as shown in FIG. 2, the male mold 3 is fixed to a stationary platen (not shown) on which a nozzle of an injection molding machine is mounted, and the male mold 3 has the shape of the molded product at the center thereof. Corresponding stepped protrusions (cores) 4 project, and runners branching into bifurcated shapes for injecting and filling molten resin from the nozzles of the injection molding machine into the cavities 12 of the female mold 2 ( Runner) 5 is formed.
[0045]
The inner peripheral portion, the intermediate portion, and the outer peripheral portion of the front surface of the male mold 3 are parting surfaces 3a, 3b that are in contact with the parting surfaces 2a, 2b, and 2c of the female mold 2 with a picture sheet S therebetween. 3c, and a protruding sheet 21 provided on the female mold 2 is attached to the parting surface 3a of the male mold 3 as shown in FIG. A fitting recess 31 is formed to be tightly fitted in this state.
[0046]
The female mold 2 is provided with a rectangular frame-shaped clamper 7 for pressing and fixing the picture sheet S to the parting surface 2c. As shown in FIG. 1, the clamper 7 has a female die 2 driven by a drive mechanism (not shown) by four connecting rods 9 slidably fitted in through holes 8 provided near the four corners of the female die 2. The parting surface 2c can be moved forward and backward in the vertical direction. The male mold 3 is provided with a groove-shaped recess 6 having a depth that allows the clamper 7 to perform a separating operation for releasing the pressing and fixing state with respect to the picture sheet S in a mold-clamping state as shown in FIG. It is installed.
[0047]
In the injection molding simultaneous painting apparatus 1 of the present embodiment configured as described above, injection molding simultaneous painting is performed in the following order of steps. That is, a sheet supplying step of supplying a picture sheet S onto the parting surfaces 2a, 2b, and 2c of the female mold 2, and the picture sheet S is pressed onto the parting surface 2c of the female mold 2 by the frame-shaped clamper 7. Clamping step of holding, heating softening step of heating and softening the picture sheet S pressed and held by a heating plate (not shown), and the annular grooves 15 and 16 formed in the female die 2 of the heat softened picture sheet S And a drawing step of drawing the vacuum through the vacuum suction holes 17, 17,... So as to be in close contact with the cavity 12 of the female mold 2, and moving the female mold 2 toward the male mold 3 to clamp the mold. A mold-clamping step, in which a molten or uncured liquid injection molding resin is injected and filled into the cavity 12 formed between the female mold 2 and the male mold 3 from the runner 5 of the male mold 3 The Injection molding step for molding out, mold opening step of separating the said female mold 2 and the male 3 and the decorative sheet S is takeout step of taking out the molded article P which is bonded integrally from the female mold 2.
[0048]
In the injection molding simultaneous painting apparatus 1 of the present embodiment, the painting sheet S is vacuum-sucked through the annular grooves 15 and 16 formed in the female mold 2 and the vacuum suction holes 17, 17,. In the stretching step of closely contacting the cavity 12, the parting surface 2 a and the inner periphery of the cavity 12 can be clearly understood by referring to FIGS. 4 and 5 (each part is exaggerated or simplified). Of the convex and concave portions 20, 21, 20, 21,... Formed by the convex portions 21 formed at an arbitrary pitch p on the edge portion E that becomes the boundary with the rising surface 12 b on the side and the portions adjacent thereto (concave regions 20). Due to the action, a slight difference occurs in the time during which each part of the picture sheet S is stretch-molded, and the picture sheet S bends in the vicinity of the edge part E. As shown in FIGS. Seat S and front Uneven portions 20,21,20,21, ... temporarily clearance D between the vicinity is formed.
[0049]
Therefore, the air in the vicinity of the rising surface 12b of the cavity 12 where air accumulation is likely to occur is caused by the annular grooves 15 and 16 and the vacuum suction holes 17 and 17 through the gap D formed in the vicinity of the concave and convex portions 20, 21, 20, 21,. ,..., And air between the picture sheet S and the cavity 12 is surely removed by suction. When the vacuum suction through the vacuum suction holes 17, 17,... Further proceeds, the air in the gap D between the uneven portions 20, 21, 20, 21,. , 21, 20, 21,... Is stretched to eliminate the bending, and finally, as shown in FIG. 5C, the sheet S with paint is provided with the uneven portions 20, 21, 20, Are closely adhered to the entire cavity 12 including 21... And the parting surfaces 2a, 2b, and 2c without any gaps.
[0050]
Thus, in the injection molding simultaneous painting apparatus 1 of the present embodiment, it is not necessary to open the cavity 12 with a vacuum suction hole or a groove or gap serving as a vacuum suction hole. Vacuum suction efficiency is improved with a simple configuration in which convex portions 21 are formed at an arbitrary pitch between the edge portion E and the annular grooves 15 and 16 which are the boundaries between the ring surface 2a and the rising surface 12b of the cavity. Thus, the air between the picture sheet S and the cavity 12 can be surely sucked out and, as a result, the picture sheet S can be less likely to wrinkle, peel off, break, and the like, and the decorative surface of the resulting molded product P can be vacuumed. The traces such as the suction holes are not left, so that the quality, appearance design, and aesthetics can be maintained.
[0051]
In order to confirm such an effect, the annular groove 15, the vacuum suction holes 17, 17,..., The uneven portions 20, 21, 20, 21,. The dimensions, pitches, etc. of each part are specifically set as described in [Dimensions and Shapes] below, and as a comparative example, the uneven portions 20, 21, 20, 21,... As shown in FIG. Although not provided, like the device 1 of the present invention, a vacuum suction hole 17 is formed on the inner parting surface 2a of the cavity of the female mold 2 through an annular groove 15 formed so as to go around the cavity 12. .. Are not provided, and the concavo-convex portions 20, 21, 20, 21,... As shown in FIG. 12 are not provided. Nested structure consisting of split type 2A, 2B, front A slit-shaped gap 25 ′ (100 μ) is formed between the split molds (nesting) 2 A and 2 B so as to function as a vacuum suction hole, and the gap 25 ′ is formed on the lowest bottom surface 12 a of the cavity 12 of the female mold 2. Opened at a position about 3 mm away from the end of the corner (R = 0.5 mm) and formed with vacuum suction holes 17, 17,... And an annular groove 15 similar to the above (Comparative Example II) ) And a comparative test was performed under the same conditions described in [Injection molding simultaneous painting conditions], and the results as described in [Results] were obtained.
[0052]
(Dimensional shape)
As can be clearly understood with reference to FIG. 4, the distance L between the edge portion E and the annular groove 15 is set to 4 mm, the convex portion 21 is formed into a short prism shape, and the direction along the parting surface 2a is set. The width α is 1 mm, the height β in the direction along the rising surface 12 b of the cavity 12 is 0.3 m, the width length γ is 1 mm, and the pitch p of the convex portion 21 (same as the width length of the concave region 20). Is set to 3.5 mm, the width F of the annular groove 15 is set to 3 mm, the depth d is set to 1 mm, the diameter of the vacuum suction holes 17, 17,... Is 1.5 mm, and the pitch is 30 mm. Set to. Further, the height H (FIG. 4) of the rising surface 12b of the cavity 12 was 4 mm, and the width of the bottom surface 12a was 12 mm.
[0053]
[Conditions for simultaneous injection molding]
(1) As a sheet S with a picture, an acrylic base sheet (thickness is 125 μm), a decorative layer (mixture of acrylic resin and vinyl chloride vinyl acetate resin) with a wood pattern printed thereon and an adhesive layer A laminated laminate sheet (laminate sheet) was used which was made of (vinyl chloride vinyl acetate resin) and used as a final product while the base sheet was closely integrated with the molded product (injection resin molded product).
[0054]
(2) The heating time and heating temperature of the picture sheet S by the heating plate in the heating and stretching step are about 6 seconds and about 130 degrees C, respectively, and the vacuum suction time through the vacuum suction holes 17, 17,. Was about 4 seconds.
(3) Heat-resistant ABS was used as the injection molding resin, the molding temperature was about 250 ° C., and the mold temperature was about 60 ° C.
[0055]
〔result〕
(1) In the device 1 of the present invention, the picture sheet S is not wrinkled, peeled or torn, the decorative part has no trace such as a vacuum suction hole, and the uneven parts 20, 21, 20, 21,. A good molded product P almost inconspicuous was obtained.
(2) In Comparative Example I, the obtained molded product had wrinkles, peeling, tearing, and the like in the vicinity of the edge portion E, and was not usable as a product in appearance.
(3) In Comparative Example II, the picture sheet S was not wrinkled, peeled or torn, but a linear trace of the gap 25 'between the divided shapes 2A' and 2B '(nested) was formed.
[0056]
FIG. 7 shows the main part of the female mold 2 of another embodiment. In addition to the configuration of the female mold 2 of the above-described embodiment, the female mold 2 shown in FIG. 1 has a nested structure composed of a plurality of divided molds 2A and 2B. A slit-like gap 25 serving as a vacuum suction hole is formed therebetween, and the gap 25 is separated by about 0.3 mm from the corner (R = 0.5 mm) end portion of the corner portion of the lowest bottom surface 12 a of the cavity 12. A configuration with an opening at a certain position is added. The width of the gap 25 was 30 μm.
[0057]
In this manner, the female mold 2 is nested and the gap 25 is formed between the divided molds 2A and 2B, and the gap 25 is opened at a specific position of the cavity 12 so as to function as a vacuum suction hole. Thus, in addition to the air suction eliminating effect due to the action of the uneven portions 20, 21, 20, 21,... Formed in the edge portion E, the air suction eliminating effect through the gap 25 can be expected.
[0058]
In this case, since the air suction exclusion effect is obtained by the action of the concave and convex portions 20, 21, 20, 21,..., The burden of air suction exclusion by the gap 25 between the split molds 2A and 2B can be reduced. Therefore, the split mold 2A of the present invention is compared with the gap 25 'between the split molds 2A and 2B in the conventional female mold (FIG. 12) in which the concave and convex portions 20, 21, 20, 21,. Since the gap 25 between 2B can be narrowed, the linear trace of this gap (nested trace) 25 can be made inconspicuous, and as a result, the quality, appearance design, and aesthetics of the obtained molded product can be further improved.
[0059]
FIG. 8 shows a main part in the vicinity of the edge part E of a female mold 2 according to another embodiment of the present invention. In this embodiment, the convex portion 21 is a part away from both the edge portion E and the annular groove 15, in other words, in the middle of the region (20) between the edge portion E and the annular groove 15 in the parting surface 2 a. The length γ in the direction along the annular groove 15 is longer than that shown in FIGS. 4 and 5. Other specifications are the same as those shown in FIGS. The advantage of this form is that the shape of the concavo-convex portions 20, 21, 20, 21,... Is less likely to be molded into a molded product as compared with the forms of FIGS. Of course, the dimensions of the convex portion 21 are not limited to those shown in this figure, and α = β, α> β (the definitions of α, β, and γ are the same as those in FIG. 4).
[0060]
As can be understood with reference to FIG. 9, the convex portion 21 as described above protrudes between the edge portion E on the female parting surface 2 a or the parting surface 2 c and the annular grooves 15 and 16. In this case, it is necessary to form a concave portion 31 into which the convex portion 21 is fitted in the male mold 3. Here, as shown in FIG. 2 and FIG. 9A, when the intermediate parting surface 2b is provided so as to form a step adjacent to the parting surface 2a or 2c, The male mold 3 includes a parting surface 3a that is in contact with the parting surfaces 2a, 2b, and 2c of the female mold 2 with an inner sheet, an intermediate part, and an outer periphery of the front surface of the male mold 3 with a picture sheet S therebetween. 3b, 3c are formed. In this case, the concave part 31 into which the convex part 21 is fitted is larger than the convex part 21 because the male part 3 and the female part 2 are provided with intermediate parting surfaces 3b and 2b for sealing the cavity 12, respectively. A recess 31 having a size enough to include the recess region 20 adjacent thereto is formed.
[0061]
In contrast, as shown in FIG. 9B, when the male part 3 and the female part 2 are not provided with the intermediate parting surfaces 3b and 2b, respectively, a picture is attached to ensure the sealing of the cavity 12. A concave portion 31 is formed which is closely fitted to the convex portion 21 with the sheet S attached thereto.
[0062]
【The invention's effect】
As can be understood from the above description, according to the injection molding simultaneous painting apparatus and method according to the present invention, it is not necessary to open a vacuum suction hole or a groove or gap serving as a vacuum suction hole in the cavity. Although it has a simple configuration in which convex portions are projected at an arbitrary pitch between the edge portion and the annular groove on the parting surface with respect to the female mold of the configuration, the vacuum suction efficiency can be improved, The air between the cavity can be surely removed by suction, and as a result, the picture sheet can be made less susceptible to wrinkles, peeling, tearing, etc. The excellent effect that the quality, appearance design, and aesthetics can be maintained is obtained. Further, the mechanical strength of the mold is not lowered.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a main part of a female mold of an embodiment of an injection molding simultaneous painting apparatus according to the present invention.
2 is an enlarged central cross-sectional view showing a female mold and a male mold of the apparatus shown in FIG. 1 in a clamped state.
3 shows a molded product to be obtained by the apparatus shown in FIG. 1, (A) is a plan view, and (B) is an enlarged longitudinal sectional view of (A).
4 is an enlarged view of the vicinity of the arrow B in FIG. 1, (A) is an enlarged perspective view of the main part, (B) is a cutaway view taken along the arrow X in (A), and (C) is Y in (B). -Sectional drawing which follows a Y arrow sight line.
FIGS. 5A and 5B are provided for explaining the function and effect of the apparatus shown in FIGS. 1 and 2, and FIGS. 5A and 5B are enlarged views of the vicinity of the arrow B in FIG. FIG. 2C is an enlarged cross-sectional view of the main part, and FIG.
6 is a longitudinal sectional view of an essential part showing a female mold and a male mold of the apparatus shown in FIG. 1 in a clamped state.
FIG. 7 is a cross-sectional view showing the main part of a female mold of another embodiment of the simultaneous injection molding and painting apparatus according to the present invention.
FIG. 8 is a cross-sectional view showing the main part of a female mold of another embodiment of the simultaneous injection molding and painting apparatus according to the present invention.
9 is a longitudinal sectional view of an essential part for explaining the structure of a female mold and a male mold provided in the embodiment of FIG. 7;
FIG. 10 is a cross-sectional view showing a main part of a female mold of the injection molding simultaneous painting apparatus of the conventional example (2) and the comparative example I.
FIG. 11 is a cross-sectional view showing a main part of a female die of an injection molding simultaneous painting apparatus of a conventional example (3).
12 is a cross-sectional view showing a main part of a female die of the injection molding simultaneous painting apparatus of the conventional example (4) and comparative example II. FIG.
FIG. 13 is a cross-sectional view showing a main part of a female die of the injection molding simultaneous painting apparatus of the conventional example (5).
[Explanation of symbols]
S picture sheet
1 Injection molding simultaneous painting equipment
2 female
2a, 2b, 2c Parting surface
3 Male
3a, 3b, 3c Parting surface
12 cavities
12a Bottom
12b Rising surface
15, 16 annular groove
17 Vacuum suction hole
20 Concave area
21 Convex
E Edge part

Claims

A female die and a male die are provided, and an annular groove is formed so as to go around the cavity at a predetermined distance from an edge portion that is a boundary with the rising surface of the cavity in the female parting surface. In addition, a vacuum suction hole is opened in the annular groove at an arbitrary pitch, and a projecting portion is protruded at an arbitrary pitch on the parting surface between the edge portion and the annular groove. Injection molding simultaneous painting device.

2. The simultaneous injection molding and painting apparatus according to claim 1, wherein the convex portion protrudes from an end portion of the parting surface including the edge portion.

2. The simultaneous injection molding and painting apparatus according to claim 1, wherein the convex portion protrudes from a portion away from the edge portion.

4. The injection molding simultaneous painting apparatus according to claim 1, wherein the convex portion is set to a size that does not reach the annular groove and the vacuum suction hole.

5. The injection molding simultaneous painting apparatus according to claim 1, wherein a concave portion into which the convex portion is fitted is formed on the male parting surface.

The female mold has a nested structure composed of a plurality of divided molds, a slit-shaped gap is formed between the divided molds as a vacuum suction hole, and the gap is opened in the cavity of the female mold. 6. An injection molding simultaneous painting apparatus according to any one of claims 1 to 5.

An injection molding simultaneous painting method using the injection molding simultaneous painting apparatus according to claim 1,
A sheet supplying step of supplying a picture sheet on the female parting surface, a clamping step of fixing and holding the picture sheet on the female parting surface, and the picture sheet formed on the female mold. A drawing step of drawing the vacuum through the vacuum suction hole so as to be closely attached along the cavity of the female mold, and clamping the mold by moving one of the female mold and the male mold to the other side An injection molding step of performing injection molding by injecting and filling a resin in a fluid state from the male mold side into a cavity formed between the female mold and the male mold, and the female mold and the male mold. A mold opening step for separating, and an extraction step for taking out the injection-molded product to which the picture sheet is adhered from the female mold, and sequentially or a plurality of steps by replacing the steps in the order of description or the order thereof. Heavy at the same time Foil-decorating injection molding method is to perform with or in parallel to.