JP4206572B2 - Foam mold - Google Patents

Foam mold Download PDF

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Publication number
JP4206572B2
JP4206572B2 JP22580099A JP22580099A JP4206572B2 JP 4206572 B2 JP4206572 B2 JP 4206572B2 JP 22580099 A JP22580099 A JP 22580099A JP 22580099 A JP22580099 A JP 22580099A JP 4206572 B2 JP4206572 B2 JP 4206572B2
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space
air
projecting
protruding
mold
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JP2001047450A (en
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秀司 金森
悟 林
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Inoac Corp
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Inoac Corp
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    • 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
    • B29C44/00Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34Auxiliary operations
    • B29C44/58Moulds

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  • Moulds For Moulding Plastics Or The Like (AREA)

Description

【0001】
【発明の属する技術分野】
この発明は、発泡成形型に関し、更に詳細には、外面に複数の突部を有する発泡成形品を発泡成形するに際し、キャビティに画成された突出空間内に閉込められた空気およびガスを型外へ排出して該発泡成形品の突部に欠肉部が形成されることを防止するよう構成した発泡成形型に関するものである。
【0002】
【従来の技術】
一般的に発泡成形型は、例えば図7に示すように互いに開閉可能な上型41と下型42から構成され、下型42に対して上型41を型締めすることで発泡成形品の形状を前提としたキャビティ43が内部に画成されている。そして、前記発泡成形型30による発泡成形品Pの成形に際しては、例えばオープン注入法による場合を例にとると、上型41を開放した下で下型42のキャビティ43内に所定量のウレタン原液を注入して該上型41を該下型42に型締めすると、ウレタン原液は化学反応により白濁したクリーム状となった後に細かい気泡が発生して発泡を開始し、所定時間(ライズタイム)後にキャビティ43に充満するようになる。
【0003】
ところで図8(a)に示した前記発泡成形品Pは、適宜の間隔で隣接して外方へ突出する合計4個の突部P1,P2,P3,P4を有した形状を呈しているため、前記発泡成形型40では、上型41の内面に壁体部41a,41b,41cを突設することにより、各突部P1,P2,P3,P4に対応した突出空間44,45,46,47がキャビティ43の上方に画成されている。このため、キャビティ43に注入したウレタン原液が発泡反応を開始してウレタンUが徐々に上方へ膨張すると、該キャビティ43内に残存する空気やウレタン原液の発泡反応によるガスは、各突出空間44,45,46,47へ押上げられていく。このとき、図7の両側に位置する第1突出空間44および第4突出空間47は上型41と下型42との接合分割面P.Lに隣接しているため、該突出空間44,47内の空気およびガスは、この接合分割面P.Lに成形されたガス抜き用の隙間を介して発泡成形型40の外部へ適宜排出され得る。しかるに、内側に位置する第2突出空間45および第3突出空間46は前記接合分割面P.Lに隣接していないため、該突出空間45,46内の空気およびガスは型外へ排出されることなく残留してしまう。従って実際に成形された発泡成形品Pでは、図8(b)に示すように、前記第2突出空間45および第3突出空間46に対応した前記突部P2,P3に欠肉部Sが形成され、これにより製品不良を招来していた。
【0004】
そこで、前述した問題点を解決するために、例えば図9に示すような発泡成形型が提案されて実施に供されている。この発泡成形型55では、前記第2突出空間45および第2突出空間46に対応した上型41の壁部に、夫々の突出空間45,46内と型外とを連通する直径3mm程度の空気排出孔56を形成し、発泡成形過程において各突出空間45,46内の空気およびガスを型外へ排出することを許容した型式のものである。またこの型式の発泡成形型55では、前記空気排出孔56に対応した型内壁面に、空気およびガスのみを通過させるスラブ57を配設するものもある。なお図示しないが、前記上型41の壁部に夫々の突出空間45,46内と型外とを連通する空気放出口を開設すると共に各空気放出口を閉塞可能な栓部材を設け、発泡成形工程において該栓部材を空気放出口から脱抜することで対応の突出空間45,46内の空気およびガスを型外へ排出し得るようにした発泡成形型も実施されている。
【0005】
【発明が解決しようとする課題】
ところで、図9に例示した発泡成形型55では、前記第2突出空間45および第3突出空間46内の空気およびガスを型外へ排出することを許容するので、成形された発泡成形品Pの各突部P2,P3に前記欠肉部Sが形成される不都合を回避することはできる。しかるに前記発泡成形型55では、前記スラブ57を装備しないタイプにおいては、1回の成形作業で該空気排出孔56にウレタンUが詰まってしまうので毎回これを除去する作業を伴い、生産効率が極めて低い欠点を内在している。また前記スラブ57を装備したタイプでは、空気排出孔56のウレタン除去作業は不要となるとしても、成形作業毎に該スラブ56を装着セットする作業が必要となり、この形態でも成形作業の合理化や生産効率の向上は図り得なかった。しかも前記発泡成形型55では、空気およびガスの排出量をコントロールできないので、空気およびガスの抜け過ぎによる発泡成形品のPの底上がりが発生してしまう欠点も内在している。
【0006】
【発明の目的】
本発明は、前述した課題を好適に解決するべく提案されたもので、発泡成形途中においてはキャビティの各突出空間内に存在する空気およびガスが接合分割面側へ通過することを許容すると共に、発泡最終段階においては各突出空間内に閉込められた空気の収容を許容する空気流通収容路を設けることで、発泡成形品の突部に欠肉部が形成されることを防止すると共にメンテナンスの簡素化による生産効率向上を図った発泡成形型を提供することを目的とする。
【0007】
【課題を解決するための手段】
前記課題を解決し、所期の目的を達成するために、本発明に係る発泡成形型は、適宜の間隔で隣接して外方へ突出する少なくとも2つの突部を有する発泡体を成形するための発泡成形型であって、その開閉自在な上型および下型の内部に画成されるキャビティに前記夫々の突部に対応する突出空間を画成し、これら突出空間は前記上型および下型の接合分割面に隣接する突出空間と、該接合分割面に隣接しない突出空間とに分かたれる発泡成形型において、
前記キャビティに形成されて前記夫々の突出空間を仕切る壁部に、隣接し合う突出空間を相互に連通する空気流通収容路を開設し、
前記キャビティ中で反応して膨張するウレタンが前記突出空間へ侵入するに伴なって、これら突出空間に存在する空気および該ウレタンから発生するガスは、これら空気流通収容路を介して前記接合分割面に隣接する突出空間へ移動し、最終的にこの接合分割面から型外へ排出されるよう構成したことを特徴とする。
【0008】
【発明の実施の形態】
次に、本発明に係る発泡成形型につき、好適な実施例を挙げて、添付図面を参照しながら以下説明する。なお本実施例では、前述した図8(a)に例示する形状の発泡成形品、すなわち外面上部に適宜の間隔で隣接して上方へ突出する合計4個の突部P1,P2,P3,P4を有した形状の発泡成形品Pを成形する発泡成形型につき説明する。
【0009】
(発泡成形型)
図1は、本発明の一実施例に係る発泡成形型を概略的に示す断面図であって、本実施例の発泡成形型10は、互いに開閉自在な上型11と下型12から構成され、前記下型12の開口部12aに対して前記上型11を型締めすることで、前記発泡成形品Pの形状を前提としたキャビティ13が内部に画成されるようになっている。なお前記発泡成形型10は、オープン注入によりウレタン原液を注入するタイプのもので、上型11を開放した状態で下型12の前記開口部12aを介して所定量のウレタン原液をキャビティ13内に注入するようになっている。また、下型12と上型11とを型締めした際には、該下型12と上型11との接合分割面(パーティングライン)P.Lにガス抜き用の隙間が画成されるようになっており、キャビティ13内の空気およびガスを型外へ排出し得るようになっている。
【0010】
前記上型11では、前記発泡成形品Pの形状を前提として、該発泡成形品Pの前記各凹部Pa,Pb,Pcに対応する壁部18,19,20が内面に膨出形成され、これにより前記発泡成形品Pの前記各突部P1,P2,P3,P4に対応した突出空間14,15,16,17が、キャビティ13の上方へ画成されている。そして、この上型11が前記下型12に型締めされた状態においては、両側に位置する第1突出空間14および第4突出空間17は上型11と下型12との接合分割面P.Lに隣接していると共に、内側に位置する第2突出空間15および第3突出空間16は該接合分割面P.Lに隣接していない。
【0011】
(空気流通収容路)
そして本実施例の発泡成形型10では、第1突出空間14と第2突出空間15を仕切る前記第1壁部18の上方基部に、各突出空間14,15の上方隅角部に開口して両突出空間14,15同士を空間的に連通する第1空気流通収容路21が形成されている。また、前記第2突出空間15と第3突出空間16とを仕切る前記第2壁部19の上方基部には、各突出空間15,16の上方隅角部に開口して両突出空間15,16同士を空間的に連通する第2空気流通収容路22が形成されている。すなわち第1空気流通収容路21は、第1および第2突出空間14,15内へ侵入して徐々に膨張するウレタンUの上昇方向に対して、空気およびガスが最終的に閉込められる上方隅角部に開口している(図3)。一方、第2空気流通収容路22も、第2および第3突出空間15,16内へ侵入して徐々に膨張するウレタンUの上昇方向に対して、空気およびガスが最終的に閉込められる上方隅角部に開口している(図3)。
【0012】
なお各空気流通収容路21,21のサイズは、例えば直径2mm〜8mm程度とされ、好適には直径3mm〜6mmの範囲で設定するのが望ましい。すなわち、直径2mm以下の場合はウレタンUが詰まって閉塞し易く、また直径8mm以上の場合はウレタンUが容易に侵入して発泡成形品Pの製品面に突出部が形成される問題が生ずる。なお、第1空気流通収容路21および第2空気流通収容路22は、各突出空間15,16内に最終的に閉込められる空気およびガスの合計体積を前提としたもとで、この体積と同程度の容積となるようその形成数を設定するのが望ましいが、該空気およびガスは適宜圧縮されて体積が小さくなるので合計体積の30%の容積以上であればよい。
【0013】
このように本実施例の発泡成形型10では、前記第2突出空間15が、前記第1空気流通収容路21および第1突出空間14を介して上型11および下型12の接合分割面P.Lに空間的に連通しており、該第2突出空間15内の空気およびガスは、これら第1空気流通収容路21および第1突出空間14を介して接合部P.Lから型外へ適宜排出可能となっている(図2)。また、前記第1突出空間14および第2突出空間15の上面にウレタンUの上面が到達した時点においては、両突出空間14,15内に閉込められた空気およびガスは、その一部が第1空気流通収容路21へ収容され得るようになっている(図3)。
【0014】
一方、前記第3突出空間16は、前記第2空気流通収容路22,前記第2突出空間15,前記第1空気流通収容路21および第1突出空間14を介して上型11および下型12の接合分割面P.Lに空間的に連通しており、該第3突出空間16内の空気およびガスは、これら第2空気流通収容路22,前記第2突出空間15,前記第1空気流通収容路21および第1突出空間14を介して接合分割面P.Lから型外へ排出可能となっている(図2)。また、前記第1〜第3突出空間14,15,16の上面にウレタンUの上面が到達した時点において、該第2突出空間15および第3突出空間16内に閉込められた空気およびガスは、その一部が第2空気流通収容路22へ収容され得るようになっている(図3)。
【0015】
【実施例の作用】
前述のように構成された本実施例の発泡成形型10では、上型11を開放した下で、図示しない注入装置により下型12のキャビティ13内へ所定量のウレタン原液を注入する。そして、ウレタン原液の注入完了後に前記上型11を下型12に型締めすると、ウレタン原液は化学反応により白濁したクリーム状となった後に細かい気泡が発生して発泡を開始し、キャビティ13に徐々に充満していく(図1)。この際に、キャビティ13内に残存する空気およびウレタン原液の発泡反応により発生したガスは、ウレタンUの膨張と共に上方へ徐々に押上げられ、下型12および上型11の接合分割面P.Lに画成された隙間を介して型外へ適宜排出される。
【0016】
そして、発泡により膨張するウレタンUの上面が、前記第1壁部18,第2壁部19および第3壁部20の下面に到達すると、図2に示すように、前記各突出空間14,15,16,17は夫々が独立した空間として区分される。ここで前述したように、図1の両側に位置する第1突出空間14および第4突出空間17は、上型11と下型12の接合分割面P.Lに隣接しているので、当該の突出空間14,17内を上昇するウレタンUにより押上げられる空気およびガスは、該接合分割面P.Lを介して型外へ適宜排出される。一方、図1の内側に位置する第2突出空間15および第3突出空間16に関しては、前述したように、何れの突出空間15,16も前記第1空気流通収容路21および第2空気流通収容路22を介して前記接合分割面P.Lに空間的に連通している。従って、第2突出空間15内に侵入して上昇するウレタンUにより押上げられる該空間15内の空気およびガスは、第1空気流通収容路21および前記第1突出空間14を通って前記接合分割面P.Lから型外へ排出されるので、第2突出空間15内へのウレタンUの膨張を好適に許容する。一方、前記第3突出空間16内に侵入して上昇するウレタンUにより押上げられる該空間16内の空気およびガスは、第2空気流通収容路22,第2突出空間15,第1空気流通収容路21および第1突出空間14を通って前記接合分割面P.Lから型外へ排出されるので、第3突出空間16内へのウレタンUの膨張を好適に許容する。
【0017】
このように、第1〜第4の各突出空間14,15,16,17に侵入したウレタンUが、夫々の突出空間14,15,16,17内を発泡しながら上昇している過程では、各突出空間14,15,16,17内に残存した空気およびガスは、前記接合分割面P.Lを介して発泡成形型10の外部へ順次排出される。従ってウレタンUは、第2突出空間15および第3突出空間16内へも好適に膨張するようになる。
【0018】
そして、前記第1突出空間14内を上昇したウレタンUの上面中央部が当該突出空間14の上面に到達すると、図3(a)に示すように、第2突出空間15と接合分割面P.Lとの空間的な連通が遮断され、また第2突出空間15内を上昇したウレタンUの上面中央部が当該突出空間15の上面に到達すると、第1突出空間14(接合分割面P.L)と第3突出空間16との空間的な連通が遮断される。従って、この時点で第1突出空間14の上部隅角部に閉込められた空気およびガスにおいて、接合分割面P.Lに連通しない上部隅角部に閉込められた空気およびガスは、該空間14内で更に膨張するウレタンUの発泡圧によって、前記第1空気流通収容路21内へ押込まれて収容されるに至る。また、前記第2突出空間15の上部隅角部に閉込められた空気およびガスは、該空間15内で更に膨張するウレタンUの発泡圧によって、その一部は前記第1空気流通収容路21内へ押込まれて収容される一方、残りは前記第2空気流通収容路22内へ押込まれて収容されるに至る(図3(b))。更に、前記第3突出空間16の上部隅角部に閉込められた空気およびガスは、該空間16内で更に膨張するウレタンUの発泡圧によって、その全てが前記第2空気流通収容路22内へ押込まれて収容されるに至る(図3(b))。なお図示しないが、前記第4突出空間17内の空気およびガスは、その全てが前記接合分割面P.Lを介して型外へ排出される。
【0019】
従って本実施例の発泡成形型10では、第2突出空間15および第3突出空間16内の上部隅角部に最終的に閉込められた空気およびガスは、ウレタンUの膨張する際の発泡圧により、これら突出空間15,16の上部隅角部に開口した第1空気流通収容路21または第2空気流通収容路22内へ押込まれて収容されるようになり、図4に示すように、当該突出空間15,16内全体にウレタンUが好適に充満するようになる。しかも、前記第1空気流通収容路21および第2空気流通収容路22は、夫々の空気流通収容路21,22に隣接する突出空間14,15,16に閉込められる空気とガスの合計体積を前提とした容積に設定されているので、第2突出空間15および第3突出空間16内に空気が残留することはない。また、各突出空間14,15,16内に充満したウレタンUの圧力が同じであるから、第1空気流通収容路21および第2空気流通収容路22内の空気およびガスは両側開口部から均一的に押圧されてバランスが維持されることにより、空気流通収容路21,22へウレタンUが侵入することやこれにより空気が突出空間内へ押出される等の不都合が発生することがなく、従って発泡成形品Pの製品表面に凹部や突部が形成されない。
【0020】
そして、ライズタイムを経過した後、更に適時間が経過したら、所要の方法によりガス抜きを施し、このガス抜きが完了したらウレタンが硬化するまで待機する。そして、所要時間が経過して発泡成形品Pが所要形状で完全に硬化したら、上型11を開放してキャビティ13から該発泡成形品Pを脱型する。
【0021】
このように本実施例の発泡成形型10では、接合分割面P.Lに隣接しない第2突出空間15および第3突出空間16内に閉込められた空気およびガスの排出を好適に行ない得るので、発泡成形品Pの突部P2,P3に欠肉部が形成される不都合が好適に回避し得る。また、第1空気流通収容路21および第2空気流通収容路22内は、残存空気およびガスが押込まれて圧力が適宜上昇した状態となるので、これら空気流通収容路21,21内にウレタンUが侵入することも殆どなく、該空気流通収容路21,21を成形作業毎に清掃する必要もなく生産効率を向上させ得る。また、キャビティ13内は略最適な圧力に保持されるので、空気およびガスの過度の排出により発生する発泡成形品Pの底上がり不良も好適に回避し得る。
【0022】
図5は、キャビティ13の中央に立設したテーパ部26aを有する壁部26によってアンダーカット形状を呈する発泡成形型25を例示したものであるが、この発泡成形型25においても、該壁部26の屈曲部に空気の流通を許容する空気流通収容路28を開設することにより該屈曲部内側に閉込められた空気およびガスを好適に排出することが可能となり、発泡成形品に欠肉部が形成される不都合が好適に回避できる。すなわち、前記壁部26を挟んだキャビティ27の左右両側に注入されたウレタン原液が夫々発泡反応を開始し、左側のウレタンUが壁部26の屈曲部まで上昇すると、図6(a)に示すように、この屈曲部の内側隅角部に空気およびガスが閉込められてしまう。しかし、ウレタンUの膨張圧力により閉込められた空気およびガスは、前記空気流通収容路28を介して壁部26の右側へ順次流出し、最終的に全ての空気およびガスは右側空間へ放出された後、上型29と下型30の接合分割面P.Lから型外へ排出される。しかも、この空気およびガスが完全に放出される直前においては、図6(b)に示すように、膨張した右側のウレタンUが該空気流通収容路28を閉塞するので、この空気流通収容路28には適宜量の空気が閉込められるようになり、左右のウレタンU,Uが該空気流通収容路28内へ侵入することがない。
【0023】
なお前記実施例では、外面上部に適宜の間隔で隣接して上方へ突出する合計4個の突部P1,P2,P3,P4を有した形状の発泡成形品Pを成形する発泡成形型10につき説明した。しかし、例えば外面上部に適宜の間隔で隣接して上方へ突出する合計n個の突部P1〜Pnを有する発泡成形品を成形するに際しては、この発泡成形品を成形する発泡成形型のキャビティは、n個の各突部P1〜Pnに対応するn個の突出空間が画成されると共に、各突出空間を仕切るn個の壁部が突出形成される。このような発泡成形金型では、各突出空間を仕切るn個の各壁部に、隣接し合う突出空間を相互に連通する空気流通収容路を開設すれば、各突出空間に存在する空気およびガスは、これら空気流通収容路を介して接合分割面に隣接する突出空間へ移動し、最終的にこの接合分割面から型外へ排出される。また、各突出空間に最終的に閉込められた空気は、ウレタンの発泡圧によって夫々の突出空間に隣接する前記空気流通収容路内へ収容されるので、これに伴って各突出空間内へウレタンが充満することも許容されるようになり、発泡成形品におけるn個の各突部P1〜Pnに欠肉部が形成されることがない。
【0024】
【発明の効果】
以上説明した如く、本発明に係る発泡成形型によれば、上型と下型の接合分割面に隣接しない突出空間と該接合分割面とを空気流通収容路で空間的に連通した構造としたことにより、前記突出空間内に閉込められた空気およびガスをこの空気流通収容路を介して接合分割面から排出し得るようになり、発泡成形品の突部に欠肉部が形成される不都合を好適に回避し得る利点がある。そして空気流通収容路は、前記突出空間に最終的に空気およびガスが閉込められる部位に開口しているので、前記空気流通収容路と該突出空間と連通が遮断されたとしても、該突出空間内に閉込められた空気およびガスはウレタンの発泡圧を利用して該空気流通収容路内へ収容され、当該の突出空間内にウレタンが充満することが好適に許容される。しかも前記空気流通収容路は、最終的に閉込められる空気およびガスの合計体積を前提として容積が設定されているので、突出空間内に空気が残ったり空気流通収容路内にウレタンが侵入する等の不都合を好適に回避でき、これにより空気流通収容路内のウレタン除去作業を毎回実施する必要もない。更に、キャビティ内の圧力が最適となるので、空気およびガスの抜け過ぎによる発泡成形品の底上がり不良の発生も好適に防止できる。
【図面の簡単な説明】
【図1】本発明の一実施例に係る発泡成形型を、キャビティ中のウレタンが発泡反応により膨張しつつある状態を示す断面図である。
【図2】キャビティ内の各突出空間内に残存する空気および発泡反応によるガスが、ウレタンの膨張により発泡成形型の接合分割面を介して型外へ排出される状態を示す要部拡大断面図である。
【図3】 (a)は、ウレタンが各突出空間の上面まで膨張した際に、夫々の突出空間内に閉込められた空気およびガスが空気流通収容路内へ押込まれる状態を示す要部断面図、(b)は(a)の一部拡大断面図である。
【図4】夫々の突出空間内に残存した空気およびガスが空気流通収容路内へ収容される結果として、各突出空間内にウレタンが完全に充満した状態を示す要部断面図である。
【図5】本発明の別形態に係る発泡成形型の断面図である。
【図6】図5に示す発泡成形型のキャビティ内でウレタンが膨張している状態を示す要部断面図であって、(a)は壁部左側に閉込められた空気およびガスが空気流通収容路を介して壁部右側へ放出される状態を示し、(b)は壁部左側に閉込められた空気およびガスの放出完了に伴い空気流通収容路が閉塞される状態を示している。
【図7】従前の発泡成形型の一例を、キャビティ中でウレタンが膨張しつつある状態で示す断面図である。
【図8】 (a)は、図1に示した発泡成形型により好適に成形される発泡成形品の断面図、(b)は図7に示した従来技術に係る発泡成形型により成形される発泡成形品の断面図である。
【図9】図7に示した発泡成形型の問題点を解決するため提案された従来の別の発泡成形型の断面図である。
【符号の説明】
11 上型
12 下型
13 キャビティ
14 第1突出空間
15 第2突出空間
16 第3突出空間
18 第1壁部(壁部)
19 第2壁部(壁部)
21 第1空気流通収容路
22 第2空気流通収容路
P 発泡成形品
1 突部
2 突部
3 突部
n 突部
P.L 接合分割面
U ウレタン
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a foam mold, and more specifically, when foam-molding a foam-molded product having a plurality of protrusions on the outer surface, air and gas confined in a protruding space defined in a cavity are molded. The present invention relates to a foam molding die configured to be discharged to the outside and prevent the formation of a lacking portion at the protrusion of the foam molded product.
[0002]
[Prior art]
In general, the foam mold is composed of an upper mold 41 and a lower mold 42 that can be opened and closed with each other as shown in FIG. 7, for example. A cavity 43 is defined in the interior. When the foam molded product P is molded by the foam mold 30, for example, in the case of the open injection method, a predetermined amount of urethane stock solution is placed in the cavity 43 of the lower mold 42 while the upper mold 41 is opened. When the upper mold 41 is clamped to the lower mold 42, the urethane stock solution becomes a creamy white turbidity due to a chemical reaction, then fine bubbles are generated and foaming starts, and after a predetermined time (rise time) The cavity 43 is filled.
[0003]
By the way, the foamed molded product P shown in FIG. 8 (a) has a shape having a total of four protrusions P 1 , P 2 , P 3 , P 4 that are adjacent to each other at an appropriate interval and protrude outward. since the exhibits, in the foam molding mold 40, wall portion 41a on the inner surface of the upper mold 41, 41b, by projecting the 41c, corresponding to the projections P 1, P 2, P 3 , P 4 Protruding spaces 44, 45, 46, 47 are defined above the cavity 43. For this reason, when the urethane stock solution injected into the cavity 43 starts the foaming reaction and the urethane U gradually expands upward, the air remaining in the cavity 43 and the gas due to the foaming reaction of the urethane stock solution are transferred to the protruding spaces 44, It is pushed up to 45, 46, 47. At this time, since the first projecting space 44 and the fourth projecting space 47 located on both sides of FIG. 7 are adjacent to the joint dividing surface P.L of the upper mold 41 and the lower mold 42, the projecting spaces 44, 47 are provided. The air and gas inside can be appropriately discharged to the outside of the foaming mold 40 through the gas venting gap formed on the joining divided surface P.L. However, since the second projecting space 45 and the third projecting space 46 located on the inner side are not adjacent to the joint split surface P.L, the air and gas in the projecting spaces 45, 46 are discharged out of the mold. It will remain without. Accordingly, in the actually molded foam molded product P, as shown in FIG. 8B, the projecting portions P 2 and P 3 corresponding to the second projecting space 45 and the third projecting space 46 have a lacking portion S. As a result, defective products were caused.
[0004]
Therefore, in order to solve the above-described problems, for example, a foam mold as shown in FIG. 9 has been proposed and put into practice. In the foam molding die 55, air having a diameter of about 3 mm that communicates the inside of the protruding spaces 45, 46 with the outside of the die is connected to the wall of the upper die 41 corresponding to the second protruding space 45 and the second protruding space 46. A discharge hole 56 is formed, which allows the air and gas in the projecting spaces 45 and 46 to be discharged out of the mold during the foam molding process. In this type of foaming mold 55, there is also a type in which a slab 57 that allows only air and gas to pass is disposed on the inner wall surface of the mold corresponding to the air discharge hole 56. Although not shown, a foam member is provided on the wall of the upper die 41 by providing a plug member that can open the air discharge ports 45 and 46 to communicate with the outside of the die and close the air discharge ports. There is also implemented a foam mold in which the plug member is removed from the air discharge port in the process so that air and gas in the corresponding protruding spaces 45 and 46 can be discharged out of the mold.
[0005]
[Problems to be solved by the invention]
By the way, in the foaming mold 55 illustrated in FIG. 9, the air and gas in the second projecting space 45 and the third projecting space 46 are allowed to be discharged out of the mold. It is possible to avoid the inconvenience that the thinned portion S is formed in each of the protrusions P 2 and P 3 . However, in the foam molding die 55, in the type not equipped with the slab 57, the urethane discharge U is clogged in the air discharge hole 56 in a single molding operation, and therefore the production efficiency is extremely high. Inherent low flaws. In the type equipped with the slab 57, even if the urethane removal work of the air discharge hole 56 is not required, the work of mounting and setting the slab 56 is required for each molding work. The efficiency could not be improved. In addition, the foaming mold 55 cannot control the discharge amount of air and gas, so that the bottom of the foam molded product P rises due to excessive escape of air and gas.
[0006]
OBJECT OF THE INVENTION
The present invention has been proposed to suitably solve the above-described problems, and allows air and gas present in each protruding space of the cavity to pass to the joint splitting surface side during foam molding, In the final stage of foaming, by providing an air flow accommodating path that allows the confined air to be contained in each projecting space, it is possible to prevent the formation of a lacking part in the projecting part of the foamed molded product and to perform maintenance. An object of the present invention is to provide a foam molding die that is improved in production efficiency by simplification.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems and achieve the intended object, the foam molding die according to the present invention is for molding a foam having at least two protrusions that protrude adjacently at an appropriate interval. And a protruding space corresponding to each of the protrusions is defined in a cavity defined inside the upper and lower molds that can be freely opened and closed, and these protruding spaces are defined by the upper mold and the lower mold. In the foaming mold that is divided into a protruding space adjacent to the joint splitting surface of the mold and a protruding space not adjacent to the joint splitting surface,
On the wall part formed in the cavity and partitioning each of the protruding spaces, an air flow accommodating path that connects the adjacent protruding spaces to each other is established,
As urethane that reacts and expands in the cavity enters the projecting space, the air existing in the projecting space and the gas generated from the urethane are separated from the joint splitting surface via the air flow accommodating path. It moves to the protrusion space adjacent to, and is finally configured to be discharged out of the mold from this joint dividing surface.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, the foaming mold according to the present invention will be described below with reference to the accompanying drawings by giving preferred examples. In this embodiment, the foam molded article having the shape illustrated in FIG. 8A described above, that is, a total of four protrusions P 1 , P 2 , P that protrude upward adjacent to the upper portion of the outer surface at an appropriate interval. A foam molding die for molding a foam molded product P having a shape having 3 and P 4 will be described.
[0009]
(Foam mold)
FIG. 1 is a cross-sectional view schematically showing a foam mold according to an embodiment of the present invention. A foam mold 10 according to the present embodiment includes an upper mold 11 and a lower mold 12 that can be opened and closed with respect to each other. The upper mold 11 is clamped with respect to the opening 12a of the lower mold 12 so that the cavity 13 premised on the shape of the foam molded product P is defined inside. The foam molding die 10 is of a type in which a urethane stock solution is injected by open injection, and a predetermined amount of the urethane stock solution is put into the cavity 13 through the opening 12a of the lower die 12 with the upper die 11 opened. Injected. Further, when the lower mold 12 and the upper mold 11 are clamped, a degassing gap is defined on the joint dividing surface (parting line) PL of the lower mold 12 and the upper mold 11. Thus, the air and gas in the cavity 13 can be discharged out of the mold.
[0010]
In the upper mold 11, on the premise of the shape of the foam molded product P, wall portions 18, 19, and 20 corresponding to the recesses Pa, Pb, and Pc of the foam molded product P are formed to bulge on the inner surface. Thus, projecting spaces 14, 15, 16, and 17 corresponding to the protrusions P 1 , P 2 , P 3 , and P 4 of the foam molded product P are defined above the cavity 13. In the state where the upper mold 11 is clamped to the lower mold 12, the first projecting space 14 and the fourth projecting space 17 located on both sides of the upper mold 11 and the lower mold 12 are joined and divided. The second projecting space 15 and the third projecting space 16 which are adjacent to L and located inside are not adjacent to the joint dividing plane PL.
[0011]
(Air circulation containment path)
In the foam molding die 10 of this embodiment, the upper base of the first wall 18 that partitions the first projecting space 14 and the second projecting space 15 is opened at the upper corners of the projecting spaces 14 and 15. A first air flow accommodating path 21 is formed that spatially communicates between the two protruding spaces 14 and 15. Further, the upper base portion of the second wall portion 19 that partitions the second projecting space 15 and the third projecting space 16 opens to the upper corners of the projecting spaces 15 and 16, and both projecting spaces 15 and 16. A second air circulation accommodating path 22 is formed to communicate with each other spatially. That is, the first air circulation accommodating passage 21 has an upper corner in which air and gas are finally confined with respect to the rising direction of the urethane U which enters the first and second projecting spaces 14 and 15 and gradually expands. Opened at the corner (FIG. 3). On the other hand, the second air circulation accommodating path 22 also enters the second and third projecting spaces 15 and 16 and the air and gas are finally confined with respect to the upward direction of the urethane U that gradually expands. Opened at the corner (FIG. 3).
[0012]
The size of each of the air flow accommodating paths 21 and 21 is, for example, about 2 mm to 8 mm in diameter, and is preferably set in the range of 3 mm to 6 mm in diameter. That is, when the diameter is 2 mm or less, the urethane U is easily clogged and clogged, and when the diameter is 8 mm or more, the urethane U easily intrudes and a protrusion is formed on the product surface of the foam molded product P. The first air circulation accommodating passage 21 and the second air circulation accommodating passage 22 are based on the premise of the total volume of air and gas finally confined in the projecting spaces 15 and 16. It is desirable to set the number of formations so that the volume is about the same, but the air and gas are appropriately compressed to reduce the volume, so that the volume may be 30% or more of the total volume.
[0013]
Thus, in the foaming mold 10 of the present embodiment, the second projecting space 15 is formed by joining and dividing the surface P of the upper mold 11 and the lower mold 12 via the first air circulation accommodating path 21 and the first projecting space 14. And the air and gas in the second projecting space 15 from the joint P.L to the outside of the mold through the first air flow accommodating passage 21 and the first projecting space 14. It can be discharged appropriately (Fig. 2). Further, when the upper surface of the urethane U reaches the upper surfaces of the first projecting space 14 and the second projecting space 15, a part of the air and gas confined in the projecting spaces 14 and 15 is the first. 1 It can be accommodated in the air flow accommodating path 21 (FIG. 3).
[0014]
On the other hand, the third projecting space 16 includes the upper mold 11 and the lower mold 12 through the second air circulation accommodating path 22, the second projecting space 15, the first air circulation accommodating path 21 and the first projecting space 14. The air and the gas in the third projecting space 16 are communicated spatially with the joint dividing surface P.L of the second air flow accommodating path 22, the second projecting space 15, and the first air flow. It can be discharged out of the mold from the joint split surface P.L via the accommodating path 21 and the first projecting space 14 (FIG. 2). In addition, when the upper surface of the urethane U reaches the upper surfaces of the first to third projecting spaces 14, 15, 16, air and gas confined in the second projecting space 15 and the third projecting space 16 are A part thereof can be accommodated in the second air circulation accommodating path 22 (FIG. 3).
[0015]
[Effect of the embodiment]
In the foaming mold 10 of the present embodiment configured as described above, a predetermined amount of the urethane stock solution is injected into the cavity 13 of the lower mold 12 by an injection device (not shown) while the upper mold 11 is opened. Then, when the upper mold 11 is clamped to the lower mold 12 after the injection of the urethane stock solution is completed, the urethane stock solution becomes a creamy white turbidity due to a chemical reaction, and then fine bubbles are generated and foaming is started. (Figure 1). At this time, the air remaining in the cavity 13 and the gas generated by the foaming reaction of the urethane stock solution are gradually pushed upward together with the expansion of the urethane U, and the joint splitting plane PL of the lower die 12 and the upper die 11 is increased. The sheet is appropriately discharged out of the mold through the gap defined in FIG.
[0016]
When the upper surface of the urethane U that expands due to foaming reaches the lower surfaces of the first wall portion 18, the second wall portion 19 and the third wall portion 20, as shown in FIG. , 16 and 17 are classified as independent spaces. As described above, the first projecting space 14 and the fourth projecting space 17 located on both sides of FIG. 1 are adjacent to the joint dividing plane P.L of the upper mold 11 and the lower mold 12, so that The air and gas pushed up by the urethane U rising in the protruding spaces 14 and 17 are appropriately discharged out of the mold through the joint dividing surface P.L. On the other hand, with respect to the second projecting space 15 and the third projecting space 16 located on the inner side of FIG. 1, as described above, any of the projecting spaces 15 and 16 includes the first air circulation accommodating passage 21 and the second air circulation accommodating. It communicates spatially with the joint splitting plane PL via a path 22. Therefore, the air and gas in the space 15 pushed up by the urethane U that enters and rises into the second projecting space 15 pass through the first air flow accommodating path 21 and the first projecting space 14 and are divided and joined. Since it is discharged out of the mold from the surface P.L, the expansion of the urethane U into the second protruding space 15 is preferably allowed. On the other hand, the air and gas in the space 16 pushed up by the urethane U that enters and rises into the third projecting space 16 are the second air circulation housing path 22, the second projecting space 15, the first air circulation housing. Since it is discharged out of the mold through the path 21 and the first projecting space 14 from the joint split surface P.L, the expansion of the urethane U into the third projecting space 16 is preferably allowed.
[0017]
Thus, in the process in which the urethane U that has entered each of the first to fourth protruding spaces 14, 15, 16, and 17 is rising while foaming in the protruding spaces 14, 15, 16, and 17, The air and gas remaining in the projecting spaces 14, 15, 16, and 17 are sequentially discharged to the outside of the foaming mold 10 through the joint dividing surface P.L. Therefore, the urethane U is suitably expanded into the second protruding space 15 and the third protruding space 16.
[0018]
Then, when the center of the upper surface of the urethane U rising in the first projecting space 14 reaches the upper surface of the projecting space 14, as shown in FIG. When the spatial communication with L is interrupted and the central portion of the upper surface of the urethane U rising in the second projecting space 15 reaches the upper surface of the projecting space 15, the first projecting space 14 (joint split surface P.L. ) And the third projecting space 16 are disconnected from each other. Accordingly, in the air and gas confined in the upper corner portion of the first projecting space 14 at this time, the air and gas confined in the upper corner portion that does not communicate with the joint split surface P.L are in the space. Due to the foaming pressure of the urethane U that further expands in the interior 14, it is pushed into the first air flow accommodating path 21 and accommodated. In addition, the air and gas confined in the upper corner of the second projecting space 15 are partly expanded by the foaming pressure of the urethane U that further expands in the space 15, and a part of the air and gas is the first air circulation accommodating passage 21. While being pushed in and accommodated, the remainder is pushed into the second air flow accommodating path 22 and accommodated (FIG. 3B). Further, the air and gas confined in the upper corner of the third projecting space 16 are all in the second air circulation accommodating path 22 due to the foaming pressure of urethane U that further expands in the space 16. To be accommodated (FIG. 3B). Although not shown, all of the air and gas in the fourth projecting space 17 are discharged out of the mold through the joint dividing surface P.L.
[0019]
Therefore, in the foaming mold 10 of the present embodiment, the air and gas finally confined in the upper corners in the second protruding space 15 and the third protruding space 16 are the foaming pressure when the urethane U expands. As a result, the first air circulation accommodating passage 21 or the second air circulation accommodating passage 22 opened in the upper corners of the projecting spaces 15 and 16 are pushed into and accommodated, as shown in FIG. The urethane U is suitably filled in the entire protruding spaces 15 and 16. In addition, the first air circulation accommodating passage 21 and the second air circulation accommodating passage 22 have a total volume of air and gas confined in the projecting spaces 14, 15, 16 adjacent to the respective air circulation accommodating passages 21, 22. Since the predetermined volume is set, air does not remain in the second protruding space 15 and the third protruding space 16. In addition, since the pressure of the urethane U filled in the protruding spaces 14, 15, 16 is the same, the air and gas in the first air circulation accommodating passage 21 and the second air circulation accommodating passage 22 are uniform from both side openings. As a result of being pressed and maintained in balance, there is no inconvenience that the urethane U enters the air flow accommodating passages 21 and 22 and the air is pushed into the protruding space. No recesses or protrusions are formed on the product surface of the foam molded product P.
[0020]
Then, after the rise time has elapsed, when a further appropriate time has elapsed, degassing is performed by a required method, and when this degassing is completed, the process waits until the urethane is cured. Then, when the required time has elapsed and the foam molded product P is completely cured in the required shape, the upper mold 11 is opened and the foam molded product P is removed from the cavity 13.
[0021]
Thus, in the foam molding die 10 of the present embodiment, air and gas confined in the second projecting space 15 and the third projecting space 16 that are not adjacent to the joint split surface P.L can be suitably discharged. Inconveniences in which a lacking portion is formed in the protrusions P 2 and P 3 of the foam molded product P can be suitably avoided. Moreover, since the remaining air and gas are pushed into the first air circulation accommodating passage 21 and the second air circulation accommodating passage 22 and the pressure is appropriately increased, the urethane U is contained in the air circulation accommodating passages 21, 21. , And the air flow accommodating passages 21 and 21 do not need to be cleaned for each molding operation, and production efficiency can be improved. Further, since the inside of the cavity 13 is maintained at a substantially optimum pressure, it is possible to suitably avoid the bottom-up failure of the foam molded product P caused by excessive discharge of air and gas.
[0022]
FIG. 5 exemplifies a foam molding die 25 having an undercut shape by a wall portion 26 having a taper portion 26 a erected in the center of the cavity 13, but the wall portion 26 is also shown in this foam molding die 25. By opening the air flow accommodating path 28 that allows air to flow in the bent portion, it becomes possible to suitably discharge the air and gas confined inside the bent portion, and the foam molded product has a lacking portion. The inconvenience formed can be avoided suitably. That is, when the urethane undiluted solution injected into the left and right sides of the cavity 27 sandwiching the wall portion 26 starts the foaming reaction and the left urethane U rises to the bent portion of the wall portion 26, it is shown in FIG. As described above, air and gas are confined in the inner corner of the bent portion. However, the air and gas confined by the expansion pressure of the urethane U sequentially flow out to the right side of the wall portion 26 through the air circulation accommodating passage 28, and finally all the air and gas are released to the right space. After that, it is discharged out of the mold from the joint division surface P.L of the upper mold 29 and the lower mold 30. In addition, immediately before the air and gas are completely released, the expanded urethane on the right side U closes the air flow accommodating passage 28 as shown in FIG. Thus, an appropriate amount of air can be confined, and the right and left urethanes U and U do not enter the air flow accommodating path 28.
[0023]
In the above-described embodiment, foaming is performed to mold a foam molded product P having a total of four protrusions P 1 , P 2 , P 3 , and P 4 that protrude upward and adjacent to the upper portion of the outer surface at an appropriate interval. The mold 10 has been described. However, for example, when molding a foam molded article having a total of n protrusions P 1 to P n projecting upward adjacent to the upper portion of the outer surface at an appropriate interval, a foam molding die for molding the foam molded article is used. In the cavity, n protruding spaces corresponding to the n protruding portions P 1 to P n are defined, and n wall portions that partition the protruding spaces are formed to protrude. In such a foam-molding mold, air and gas existing in each protruding space can be formed by opening an air flow accommodating path that connects adjacent protruding spaces to each of the n wall portions that partition each protruding space. Moves to the projecting space adjacent to the joint splitting surface through these air flow accommodating paths, and is finally discharged out of the mold from this joint splitting surface. Further, since the air finally confined in each projecting space is accommodated in the air flow accommodation path adjacent to each projecting space by the foaming pressure of urethane, the urethane is moved into each projecting space accordingly. Is also allowed to fill, and no thinned portion is formed in each of the n protrusions P 1 to P n in the foamed molded product.
[0024]
【The invention's effect】
As described above, according to the foaming mold according to the present invention, the protruding space that is not adjacent to the joint splitting surface of the upper mold and the lower mold and the joint splitting surface are in spatial communication with each other through the air flow accommodating passage. As a result, the air and gas confined in the projecting space can be discharged from the joint splitting surface via the air flow accommodating path, and a lacking portion is formed in the projecting portion of the foam molded product. There is an advantage that can be suitably avoided. And since the air circulation accommodating path is opened to a portion where air and gas are finally confined in the protruding space, even if communication between the air circulating accommodating path and the protruding space is blocked, the protruding space The air and gas confined in the inside are accommodated in the air flow accommodating path using the foaming pressure of urethane, and it is suitably allowed to fill the urethane into the protruding space. Moreover, since the volume of the air circulation accommodating passage is set on the premise of the total volume of air and gas that is finally confined, air remains in the protruding space or urethane enters the air circulation accommodating passage. The above-mentioned inconvenience can be suitably avoided, and it is not necessary to carry out the urethane removing operation in the air circulation accommodating path every time. Furthermore, since the pressure in the cavity is optimal, it is possible to suitably prevent the occurrence of a bottom-up failure of the foam molded product due to excessive escape of air and gas.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state where urethane in a cavity is expanding due to a foaming reaction in a foaming mold according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part showing a state in which air remaining in each projecting space in the cavity and a gas due to a foaming reaction are discharged out of the mold through the joint splitting surface of the foaming mold due to expansion of urethane. It is.
FIG. 3A is a main portion showing a state in which air and gas confined in each projecting space are pushed into the air circulation accommodating path when urethane expands to the upper surface of each projecting space. Sectional drawing, (b) is a partially enlarged sectional view of (a).
FIG. 4 is a cross-sectional view of a main part showing a state in which each protruding space is completely filled with urethane as a result of the air and gas remaining in each protruding space being stored in the air circulation storing passage.
FIG. 5 is a cross-sectional view of a foam molding die according to another embodiment of the present invention.
6 is a cross-sectional view of the main part showing a state in which urethane is expanded in the cavity of the foaming mold shown in FIG. 5, where (a) shows air confined on the left side of the wall part and air circulation. FIG. 5B shows a state of being released to the right side of the wall portion through the accommodation path, and FIG. 5B shows a state of closing the air circulation accommodation path with the completion of the release of air and gas confined on the left side of the wall section.
FIG. 7 is a cross-sectional view showing an example of a conventional foaming mold in a state where urethane is expanding in a cavity.
8A is a cross-sectional view of a foam molded article suitably molded by the foam mold shown in FIG. 1, and FIG. 8B is molded by the foam mold according to the prior art shown in FIG. It is sectional drawing of a foaming molded product.
9 is a cross-sectional view of another conventional foam mold proposed to solve the problems of the foam mold shown in FIG. 7. FIG.
[Explanation of symbols]
11 Upper mold 12 Lower mold 13 Cavity 14 First projecting space 15 Second projecting space 16 Third projecting space 18 First wall (wall)
19 Second wall (wall)
21 1st air circulation accommodation path 22 2nd air circulation accommodation path P Foam molded product P 1 protrusion P 2 protrusion P 3 protrusion P n protrusion P.L Joint division surface U Urethane

Claims (6)

適宜の間隔で隣接して外方へ突出する少なくとも2つの突部(P1,P2,P3,Pn)を有する発泡体(P)を成形するための発泡成形型であって、その開閉自在な上型(11)および下型(12)の内部に画成されるキャビティ(13)に前記夫々の突部(P1,P2,P3,Pn)に対応する突出空間(14,15,16,n)を画成し、これら突出空間(14,15,16,n)は前記上型(11)および下型(12)の接合分割面(P.L)に隣接する突出空間(14)と、該接合分割面(P.L)に隣接しない突出空間(15,16,n)とに分かたれる発泡成形型において、
前記キャビティ(13)に形成されて前記夫々の突出空間(14,15,16,n)を仕切る壁部(18,19,n)に、隣接し合う突出空間(14,15,16,n)を相互に連通する空気流通収容路(21,22,n)を開設し、
前記キャビティ(13)中で反応して膨張するウレタン(U)が前記突出空間(14,15,16,n)へ侵入するに伴なって、これら突出空間(14,15,16,n)に存在する空気および該ウレタン(U)から発生するガスは、これら空気流通収容路(21,22,n)を介して前記接合分割面(P.L)に隣接する突出空間(14)へ移動し、最終的にこの接合分割面(P.L)から型外へ排出されるよう構成した
ことを特徴とする発泡成形型。
A foam molding die for molding a foam (P) having at least two protrusions (P 1 , P 2 , P 3 , P n ) adjacently projecting outward at an appropriate interval, Projection spaces (P 1 , P 2 , P 3 , P n ) corresponding to the respective protrusions (P 1 , P 2 , P 3 , P n ) in the cavity (13) defined inside the upper mold (11) and the lower mold (12) that can be freely opened and closed. 14, 15, 16, n), and these protruding spaces (14, 15, 16, n) are protruding spaces adjacent to the joint dividing surface (PL) of the upper mold (11) and the lower mold (12). In the foaming mold divided into (14) and the projecting space (15, 16, n) not adjacent to the joint splitting surface (PL),
Protruding spaces (14, 15, 16, n) adjacent to the wall portions (18, 19, n) formed in the cavity (13) and partitioning the protruding spaces (14, 15, 16, n). Opening air distribution accommodation channels (21, 22, n) that communicate with each other,
As urethane (U) that reacts and expands in the cavity (13) enters the protruding space (14, 15, 16, n), the protruding space (14, 15, 16, n) enters the protruding space (14, 15, 16, n). The existing air and the gas generated from the urethane (U) move to the projecting space (14) adjacent to the joint splitting surface (PL) through these air circulation accommodating paths (21, 22, n), and finally The foaming mold is characterized in that it is configured to be discharged out of the mold through the joint split surface (PL).
前記突部は、前記接合分割面(P.L)に隣接する第1突出空間(14)と、該接合分割面(P.L)に隣接しない第2突出空間(15)とに分かたれ、前記キャビティ(13)に形成されて第1突出空間(14)および第2突出空間(15)を仕切る壁部(18)に、両突出空間(14,15)を連通する空気流通収容路(21)が開設され、前記突出空間(14,15)に存在する空気および前記ウレタン(U)から発生するガスは、前記空気流通収容路(21)を介して前記接合分割面(P.L)に隣接する突出空間(14)へ移動して、この接合分割面(P.L)から型外へ排出される請求項1記載の発泡成形型。The protrusion is divided into a first projecting space (14) adjacent to the joint splitting surface (PL) and a second projecting space (15) not adjacent to the joint splitting surface (PL), and the cavity (13 Is formed in the wall portion (18) that divides the first projecting space (14) and the second projecting space (15), and an air circulation accommodating passage (21) that connects the projecting spaces (14, 15) is opened. In addition, the air existing in the protruding space (14, 15) and the gas generated from the urethane (U) pass through the air flow accommodating path (21), and the protruding space (14) adjacent to the joint split surface (PL). The foaming mold according to claim 1, wherein the foaming mold is discharged from the joint split surface (PL) to the outside of the mold. 前記突部は、前記接合分割面(P.L)に隣接する第1突出空間(14)と、該接合分割面(P.L)に隣接しない第2突出空間(15)および第3突出空間(16)とに分かたれ、前記キャビティ(13)に形成されて第1突出空間(14),第2突出空間(15)および第3突出空間(16)を夫々仕切る壁部(18,19)に、これら3つの突出空間(14,15,16)を連通する空気流通収容路(21,22)が開設され、前記突出空間(14,15,16)に存在する空気および前記ウレタン(U)から発生するガスは、前記空気流通収容路(21,22)を介して前記接合分割面(P.L)に隣接する突出空間(14)へ移動して、この接合分割面(P.L)から型外へ排出される請求項1記載の発泡成形型。The protrusion includes a first projecting space (14) adjacent to the joint splitting surface (PL), a second projecting space (15) and a third projecting space (16) not adjacent to the joint splitting surface (PL). The wall portions (18, 19) formed in the cavity (13) and partitioning the first projecting space (14), the second projecting space (15) and the third projecting space (16), respectively, An air circulation accommodating path (21, 22) communicating with the two protruding spaces (14, 15, 16) is established, and the gas generated from the air and urethane (U) existing in the protruding spaces (14, 15, 16). Is moved to the projecting space (14) adjacent to the joint splitting surface (PL) through the air flow accommodating path (21, 22), and discharged from the joint splitting surface (PL) to the outside of the mold. Item 1. A foaming mold according to Item 1. 前記突出空間(14)内へ膨張した前記ウレタン(U)が接合分割面(P.L)と空気流通収容路(21)との連通を遮断した後に、前記突出空間(15,16,n)内に閉込められた空気およびガスを前記空気流通収容路(21,22,n)内へ収容させることで、突出空間(15,16,n)内に該ウレタン(U)が充満することを許容する請求項1記載の発泡成形型。After the urethane (U) expanded into the protruding space (14) blocks communication between the joint split surface (PL) and the air flow accommodating path (21), the urethane (U) enters the protruding space (15, 16, n). By allowing the confined air and gas to be accommodated in the air flow accommodating path (21, 22, n), the protruding space (15, 16, n) can be filled with the urethane (U). The foaming mold according to claim 1. 前記空気流通収容路(21,22,n)は、前記ウレタン(U)が前記第突出空間(15,16,n)内へ膨張した際に前記空気およびガスが最終的に閉込められる部位で隣接する該突出空間(15,16,n)へ開口した請求項1または4に記載の発泡成形型。The air circulation accommodating passage (21, 22, n) is a portion where the air and gas are finally confined when the urethane (U) expands into the first projecting space (15, 16, n). The foaming mold according to claim 1 or 4, wherein the foaming mold is open to the adjacent protruding space (15, 16, n). 前記空気流通収容路(21,22,n)は、夫々に連通する突出空間(15,16,n)内に最終的に閉込められる空気およびガスの合計体積を前提とした容積に設定される請求項1,4または5の何れかに記載の発泡成形型。The air circulation accommodating passage (21, 22, n) is set to a volume on the premise of the total volume of air and gas finally confined in the projecting space (15, 16, n) communicating with each other. The foaming mold according to claim 1, 4 or 5.
JP22580099A 1999-08-09 1999-08-09 Foam mold Expired - Fee Related JP4206572B2 (en)

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