JP4597410B2 - Treatment method for skin edge material - Google Patents

Treatment method for skin edge material Download PDF

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Publication number
JP4597410B2
JP4597410B2 JP2001094924A JP2001094924A JP4597410B2 JP 4597410 B2 JP4597410 B2 JP 4597410B2 JP 2001094924 A JP2001094924 A JP 2001094924A JP 2001094924 A JP2001094924 A JP 2001094924A JP 4597410 B2 JP4597410 B2 JP 4597410B2
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mold
skin
foam
folded
skin material
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JP2002292670A (en
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清 松木
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Kaneka Corp
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Kaneka Corp
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Description

【0001】
【発明の属する技術分野】
この発明は、型内発泡成形体の表面に融着一体化される表皮材の外周部分の一部或いは全部を、内方へ折り返して型内発泡成形体の裏面に融着一体化する表皮付き型内発泡成形体の表皮端材の処理方法に関する。
【0002】
【従来の技術】
従来のこの種の技術としては、例えば、特開昭62−108039号に開示されている表皮材の同時成形方法等がある。この方法は、雌雄一対の成形型のうち、雌型に沿って表皮材の真空成形を行った後、雄型と表皮材との間に形成される型空間内で発泡成形をを行い、成形された発泡成形品と表皮材とを一体接合する表皮材の同時成形方法において、前記表皮材の真空成形時に表皮材の外周部分を、雌型の外周から型内に突出させた折り返し型に沿って、型の外周端辺から裏面側に折り返し成形しておき、発泡成形時に、発泡成形品の外周裏面に表皮材の折り返し部を一体接合する。しかしながら、図9乃至図10に示すように、前記折り返し部先端付近では、前記表皮材の外周部分が発泡成形品の裏面に対して立設された状態となっているので、この折り返し部先端で前記外周部分をトリミングする際には、従来通りの手作業等で行わなければならず、トリミング作業が難しい為に所定長さの突出耳部が残ることがある。
【0003】
一方例えば、実開昭61−201826号に開示されている表皮材の同時成形における表皮のトリミング方法がある。この方法では、表皮を保持する一方の型と、該型と組み合わせられて前記表皮の背後に基材成形用の空洞を形成する他方に型とを備え、他方の型には一方の型に保持された表皮の周辺のトリミングを行う切刃を設けることによって、二つの型が型合わされた時点で、一方の型に保持された表皮が切刃と溝との係合作用によりトリミングされる。しかし、本発明は表皮末端を折り返した場合には、表皮末端を折り返した外周よりも成形品の内側でトリミングすることができないという欠点がある。
【0004】
【発明が解決しようとする課題】
この発明は、以上のような問題点に鑑みてなされたものであり、表皮付き型内発泡成形体の表皮が該表皮付き型内発泡成形体表面部の端縁から内方へ折り返されて、その一面が前記表皮付き型内発泡成形体の裏面に固着された折り返し部と、該折り返しの先端から外方へ折り戻された折り戻し部とからなる表皮材を備えた表皮付き型内発泡成形体であって、該折り返しの先端から外方へ折り戻された折り戻し部を該型内発泡成形体の表面部の端縁より内側で簡単にトリミングする方法を提供することを目的とする。
【0005】
【課題を解決するための手段】
上記目的を達成するために、請求項1の手段とするところは、表皮材の熱成形時に、前記一方の金型面の全周或いは部分の開口端縁から内方へ突出するように配置される折り返しに沿って、前記表皮材の外周部分を内方へ折り返して折り返し部を形成した後、前記発泡成形を行い前記折り返し部の一面を型内発泡体の裏面に融着一体化した後、金型を開け一方の金型に保持された表皮付き型内発泡成形体の折り返し部の先端から前記表皮材の外周部分が外方へ折り戻された状態の折り戻し部において、前記折り返し部の基端より下ろした垂線が交差する位置よりも内方にて、レーザーで切断することにある。
【0006】
請求項2の手段とするところは、折り返し部の表皮端材を切断する場合に、折り返し用型をレーザー切断部より後退させておくにある。
【0007】
請求項3の手段とするところは、表皮材の熱成形時に、前記一方の金型面の全周或いは部分の開口端縁から内方へ突出するように配置される折り返しに沿って、前記表皮材の外周部分を内方へ折り返して折り返し部を形成した後、折り返しを前記一方の金型面の開口端部内方から後退させ、成形型を型締めし、前記発泡成形を行い前記折り返し部の一面を型内発泡体の裏面に融着一体化した後、金型を開け一方の金型に保持された表皮付き型内発泡成形体の折り返し部の先端から前記表皮材の外周部分が外方へ折り戻された状態の折り戻し部において、前記折り返し部の基端より下ろした垂線が交差する位置よりも内方にて、レーザーで切断することにある。
【0008】
請求項4の手段とするところは、前記熱成形時に、前記一方の金型面の全周或いは部分の開口端縁から内方へ突出するように配置される折り返しに沿って、前記表皮材の外周部分を内方へ折り返して折り返し部を形成した後、折り返しを前記一方の金型面の開口端部内方から後退させ、成形型を型締めし、前記発泡成形を行い前記折り返し部の一面を型内発泡体の裏面に融着一体化した後、金型を開け、表皮付き型内発泡成形体を脱型した後、折り返し部を形成した表皮付き型内発泡成形体を、一方の金型から離型後、位置決めジグに固定し、折り返し部の先端から前記表皮材の外周部分が外方へ折り戻された状態の折り戻し部において、前記折り返し部の基端より下ろした垂線が交差する位置よりも内方にて、レーザーで切断することにある。
【0009】
請求項5の手段とするところは、表皮材の熱成形時に、前記一方の金型面の全周或いは部分の開口端縁から内方へ突出するように配置される折り返しに沿って、前記表皮材の外周部分を内方へ折り返して折り返し部を形成した後、前記発泡成形を行い前記折り返し部の一面を型内発泡体の裏面に融着一体化した後、金型を開け、表皮付き型内発泡成形体を脱型した後、折り返し部を形成した表皮付き型内発泡成形体を、一方の金型から離型後、位置決めジグに固定し、折り返し部の先端から前記表皮材の外周部分が外方へ折り戻された状態の折り戻し部において、前記折り返し部の基端より下ろした垂線が交差する位置よりも内方にて、レーザーで切断することにある。
【0010】
請求項6の手段とするところは、更に、前記折り返し部において、折り返し部の基端より内方の位置にて、レーザーで切断することにある。
【0011】
請求項7の手段とするところは、切断に使用するレーザーがYAGレーザーであることにある。
【0012】
請求項8の手段とするところは、型内発泡成形体がオレフィン系樹脂型内発泡成形体であることにある。
【0013】
請求項9の手段とするところは、オレフィン系樹脂型内発泡成形体が無色(ナチュラル)であることにある。
【0014】
請求項10の手段とするところは、オレフィン系樹脂型内発泡成形体が、ポリプロピレン系樹脂型内発泡成形体であることにある。
【0015】
請求項11の手段とするところは、表皮材がオレフィン系熱可塑性エラストマーシートであることにある。
【0016】
請求項12の手段とするところは、オレフィン系熱可塑性エラストマーシートがポリプロピレン系熱可塑性エラストマーシートであることにある。
【0017】
請求項13の手段とするところは、表皮材が着色されたオレフィン系熱可塑性エラストマーシートであることにある。
【0018】
請求項14の手段とするところは、表皮材が少なくとも1層以上の表皮層から構成されていることにある。
【0019】
請求項15の手段とするところは、表皮材が少なくとも1層以上の着色された発泡樹脂層を持つことにある。
【0020】
【発明の実施の形態】
以下、この発明の実施形態を図面に基づいて説明する。図1乃至図3及び図11乃至図13に示すように、実施形態に係わる表皮付き型内発泡成形体1は、例えば横断面形状が略コ字型に形成された型内発泡成形体2と、表面部3と折り返し部4と折り戻し部5とからなる表皮材6とを備え、前記折り戻し部5における前記折り返し部4の基端4aより内方の所定位置L1、或いは更に前記折り返し部4の基端4aより内方の所定位置L2をも、レーザーにて切断し、外周部分8を除去したものである。
前記型内発泡成形体2は、合成樹脂からなる発泡ビーズを成形型内で発泡成形(型内発泡)したものである。
【0021】
前記表皮材6としては、例えば、塩化ビニル系樹脂や、或いはポリエチレン系樹脂、ポリプロピレン系樹脂等のポリオレフィン系樹脂等からなる熱可塑性樹脂シート等が挙げられる。なお、この表皮材6は、当該表皮付き型内発泡成形体1の表皮として使用されるので、その用途に応じて着色剤等により所望の色にあらかじめ着色しておけばよい。
この表皮材6のうち前記表皮部3は、型内発泡成形体2の表面に固着されている。前記折り返し部4は、この表面部3の端縁から内方へ折り返されてその一面が前記型内発泡成形体2に固着されている。これら表面部3と折り返し部4の前記型内発泡成形体2への固着方法としては、例えば熱による融着、接着剤による接着、又はこれらの併用等が挙げられる。
図13においては、前記折り戻し部5は折り返し部の先端4bから外方へこの折り返し部4の他面4cに重なるように、且つ、その先端が前記折り返し部4の基端4aから外方に突出するように折り戻されており、前記折り戻し部5における前記折り返し部4の基端4aより内方の所定位置L1,或いは更に前記折り返し部4の基端4aより内方の所定位置L2をも、レーザーにて切断し、外周部分8を除去したものである。
【0022】
【実施例】
前記ポリオレフィン系樹脂型内発泡成形体2は、ポリオレフィン系樹脂発泡ビーズを型内発泡させて成形したものである。前記ポリオレフィン系樹脂としては、例えば、低密度ポリエチレン、中密度ポリエチレン、高密度ポリエチレン、直鎖状低密度ポリエチレン、エチレン−酢酸ビニル共重合体、プロピレンホモポリマー、エチレン−プロピレンランダム共重合体、エチレン−プロピレンブロック共重合体、エチレン−プロピレン−ブテンランダム3元重合体、プロピレン−塩化ビニル共重合体、プロピレン−ブテン共重合体、プロピレン−無水マレイン酸共重合体、ポリ(ブテン−1)等のポリエチレン系樹脂やポリプロピレン系樹脂等が挙げられ、これらを単独で又は2種以上を混合して使用することができる。
【0023】
このポリオレフィン系樹脂は、無架橋の状態のものが好ましいが、パーオキサイドや放射線等により架橋させたものであってもよい。
【0024】
また、このポリオレフィン系樹脂に、他の熱可塑性樹脂を混合したものも使用できる。このような熱可塑性樹脂としては、前記ポリプロピレン系樹脂と混合する場合には、例えば低密度ポリエチレン、直鎖状低密度ポリエチレン、ビニル芳香族系ポリマー、ポリブテン、アイオノマー等が挙げられる。そして、前記ポリエチレン系樹脂と混合する場合には、例えばビニル芳香族系ポリマー、ポリブテン、アイオノマー等が挙げられる。なお、これらの場合の熱可塑性樹脂の配合量としては、ポリオレフィン系樹脂100重量部に対して20重量部以下、より好ましくは、5乃至10重量部とするのが望ましい。
【0025】
前記ポリオレフィン系樹脂発泡ビーズは、例えば、上記のようなポリオレフィン系樹脂をあらかじめ粒子状に成形加工しておき、耐圧容器中でこのポリオレフィン系樹脂粒子に揮発性発泡剤を含有させ、撹拌しながら水中に分散させ、加圧下で所定の発泡温度まで加熱した後、この水分散物を低圧域に放出する方法等によって、予備発泡させた状態で製造しておけばよい。
このポリオレフィン系樹脂発泡ビーズを型内発泡させる際の発泡倍率としては、3倍より小さい場合には、得られるポリオレフィン系樹脂型内発泡成形体の緩衝性等が低下する傾向があり、60倍より大きい場合には、前記ポリオレフィン系樹脂型内発泡成形体の収縮が大きくなると共に、柔らかくなり過ぎて強度等が低下する傾向があるので、3乃至60倍、好ましくは5乃至50倍、より好ましくは8乃至45倍、特に好ましくは10乃至35倍が望ましい。このようなポリオレフィン系樹脂発泡ビーズとしては、例えば、エペランPP(商品名,鐘淵化学工業社製,発泡倍率15倍)等を好適に使用できる。
【0026】
次に、上記の表皮付きポリオレフィン系樹脂型内発泡成形体1の製造方法について説明する。図4乃至図8に示すように、この実施形態に係る表皮付きポリオレフィン系樹脂型内発泡成形体1の製造方法は、成形型30を構成する2つの金型19,20のうち、一方の金型19にTPO表皮材6を配置して型締め後、この成形型内31にポリオレフィン系樹脂発泡ビーズ32を充填し、蒸気加熱によりこれらポリオレフィン系樹脂発泡ビーズ32を発泡させて互いに融着させると共に、これらポリオレフィン系樹脂発泡ビーズ32と前記TPO表皮材6を融着一体化させるものである。
【0027】
即ち、図4に示すように、まず前記一方の金型19に、前記TPO表皮材6を配置して型締めする。
【0028】
ここで、前記成形型30は、例えば垂直方向に型締め及び型開き可能な2つの金型19,20で構成されている。
【0029】
これら2つの金型19,20のうちの前記一方の金型19は、例えば、横断面が凹状で且つ内部にチャンバー19aが形成され、その表面19c側には、前記チャンバー19aと連通する複数の減圧孔19bが形成されている。そして、前記チャンバー19aには、蒸気弁A1、減圧弁B1、ドレイン弁C1がそれぞれ接続されている。
【0030】
他方の金型20は、例えば、横断面が凸状で且つ内部にチャンバー20aが形成され、その表面20c側には、前記チャンバー20aと連通する複数の蒸気孔20bが形成されている。そして、前記チャンバー20aには、蒸気弁A2、減圧弁B2、ドレン弁C2がそれぞれ接続されており、前記成形型内31へポリオレフィン系樹脂発泡ビーズ32を充填するためのフィーダー22が設けられている。
【0031】
前記TPO表皮材6を一方の金型19の表面19cに配置するには、前記TPO表皮材6をあらかじめ真空成形等により前記一方の金型19の表面19c形状に適合するように成形したものを配置してもよいし、あるいは、可撓性を有する場合には、この成形型内31に挿入して真空成形等を行うことによって配置してもよい。
【0032】
ここで、得られる表皮付きポリオレフィン系樹脂型内発泡成形体1が、例えば他の部材に取付けるための取付具等を必要とする場合には、前記他方の金型20の表面20cにあらかじめ所定形状のインサート部材(図示せず)を配置しておき、前記ポリオレフィン系樹脂発泡ビーズ32の型内発泡の際に、このインサート部材とポリオレフィン系樹脂型内発泡成形体2とが一体化されるようにしてもよい。
【0033】
次に、図5に示すように、前記フィーダー22から成形型内31へポリオレフィン系樹脂発泡ビーズ32を充填する。
【0034】
この際、前記一方の金型19の表面19cにはTPO表皮材6が配置されていて、型締めした状態では、前記他方の金型20の蒸気孔20bからしか成形型内31の空気が逃げないので、前記ポリオレフィン系樹脂発泡ビーズ32を充填し易くするために、充填時にこれらポリオレフィン系樹脂発泡ビーズ32が落下しない程度に少し型開きし、その隙間から前記空気を逃がすようにしてもよい。
【0035】
なお、前記ポリオレフィン系樹脂発泡ビーズ32は、あらかじめ内部に加圧ガスを浸透させて内圧を付与した状態で前記成形型内31へ充填してもよいし、また、加圧ガスを用いて圧縮した状態で充填してもよいし、あるいは、内圧の付与や圧縮を行うことなく、そのままの状態で充填してもよい。
【0036】
その後、図6に示すように、前記他方の金型20のチャンバー20aに接続した蒸気弁A2を開いて水蒸気Sを前記蒸気孔20bから成形型内31へ供給し、前記ポリオレフィン系樹脂発泡ビーズ32を加熱発泡させる。
【0037】
この際、前記ポリオレフィン系樹脂発泡ビーズ32が互いに融着する温度以上の温度でこれらポリオレフィン系樹脂発泡ビーズ32を本加熱する前に、互いに融着する温度より低い温度でこれらポリオレフィン系樹脂発泡ビーズ32をあらかじめ予備加熱しておけば、ポリオレフィン系樹脂発泡ビーズ32が互いに融着することなく充分に加熱された状態とすることができる。
【0038】
なお、前記ポリオレフィン系樹脂発泡ビーズ32が互いに融着する温度とは、深さが50mm程度の成形型内31へポリオレフィン系樹脂発泡ビーズ32を充填し、所定温度(所定圧力)の水蒸気Sを10乃至20秒間この成形型内31へ供給した時に、前記ポリオレフィン系樹脂発泡ビーズ32が互いに融着してポリオレフィン系樹脂型内発泡成形体2の形状を保持可能な状態となる最低温度をいう。
【0039】
このポリオレフィン系樹脂発泡ビーズ32が互いに融着する温度は、使用されるポリオレフィン系樹脂の種類等によって異なるので、あらかじめこの温度を調べてから、前記予備加熱の際の水蒸気Sの温度を設定すればよい。この水蒸気Sの温度としては、低すぎる場合には、予備加熱による効果が充分に発揮されなくなる傾向があるので、ポリオレフィン系樹脂発泡ビーズ8が互いに融着する温度をT(℃)とした場合、(T−35)乃至T(℃)、好ましくは(T−30)乃至(T−3)(℃)、より好ましくは(T−25)乃至(T−5)(℃)の範囲とするのが望ましい。また、前記水蒸気Sの圧力は、上記の温度範囲となるように適宜調整すればよい。
【0040】
また、上記のようにして予備加熱した後、その状態で所定時間保持して前記ポリオレフィン系樹脂発泡ビーズ32を水蒸気Sで蒸らせば、前記ポリオレフィン系樹脂発泡ビーズ32間に供給された水蒸気Sの潜熱を有効に利用できるので、特に厚さが大きいポリオレフィン系樹脂型内発泡成形体2を成形する場合等、前記ポリオレフィン系樹脂発泡ビーズ8をより均一に加熱できるという利点がある。
【0041】
なお、予備加熱した後は、水蒸気Sの供給を続けた状態で蒸らしてもよいし、あるいは水蒸気Sの供給を停止し、更に必要に応じてドレイン弁C2を開けた状態で蒸らしてもよい。この蒸らしの際の保持時間は、前記成形型内31におけるポリオレフィン系樹脂型内発泡ビーズ32層の厚さ、ポリオレフィン系樹脂発泡ビーズ32の大きさ、形状、発泡倍率等によって異なるが、例えば、ポリオレフィン系樹脂発泡ビーズ32層の厚さが50mm程度のものでは、約3秒間以上、好ましくは約5秒間以上、より好ましくは、約10秒間以上とすることが望ましい。
【0042】
前記ポリオレフィン系樹脂発泡ビーズ32を水蒸気Sで蒸らした後は、前記ポリオレフィン系樹脂発泡ビーズ32間にドレイン(水分)が存在し、その状態で本加熱すればポリオレフィン系樹脂発泡ビーズ32相互の融着不良が生じることがあるため、前記ドレインを除去することが望ましい。
【0043】
このドレインを除去する方法としては、例えば、図7に示すように、前記他方の金型20のチャンバー20aに接続した減圧弁B2を開いて前記蒸気孔20bから成形型内31を真空引きする方法や、あるいは、成形型30を少し型開きして2つの金型19,20間に隙間を設け、前記蒸気孔20bからポリオレフィン系樹脂発泡ビーズ32が互いに融着しない程度の高温で且つ乾燥した空気を通気させて前記隙間からドレインを除去する方法等が挙げられる。
【0044】
次に、前記ポリオレフィン系樹脂発泡ビーズ32が互いに融着する温度以上の温度で本加熱する。この本加熱は、図8に示すように、前記蒸気弁A2を開いて水蒸気Sを前記蒸気孔20bから成形型内31へ供給することにより行われる。この際、上記のように、水蒸気Sによる蒸らしを行った後、ドレインを除去するために前記成形型内31を真空引きしていた場合には、前記本加熱のための水蒸気Sをよりスムーズに成形型内31へ供給することができる。
【0045】
また、この際の水蒸気Sの温度は、前記ポリオレフィン系樹脂発泡ビーズ8が互いに融着する温度以上であればよいが、高すぎる場合には、得られるポリオレフィン系樹脂型内発泡成形体2の収縮が大きくなり過ぎる傾向があるので、前記ポリオレフィン系樹脂発泡ビーズ8が互いに融着する温度より30℃高い温度、好ましくは25℃高い温度を越えないようにするのが望ましい。
【0046】
上記のようにして本加熱した後は、前記ポリオレフィン系樹脂発泡ビーズ32に、水蒸気Sによる熱を充分に伝達せるために、その状態を保持することが望ましい。この際の保持に要する時間は、例えば、ポリオレフィン系樹脂発泡ビーズ32層の厚さが50mm程度のものに対しては約2秒間以上、好ましくは約5秒間以上であることが望ましいが、その時間が長すぎる場合には、得られるポリオレフィン系樹脂型内発泡成形体2に収縮が生じるので、このような収縮が生じない範囲内で適宜設定すればよい。
【0047】
次いで、前記成形型30を型開きすれば、図9,10に示すように、折り返し部5を有する表皮付きポリオレフィン系樹脂型内発泡成形体1が得られる。
なお、型開きする前に、前記成形型30はあらかじめ冷却しておいてもよい。次いで、得られた表皮付きポリオレフィン系樹脂型内発泡成形体1は、成形型30から脱型する前、或いは脱型した後に、図11乃至13に示すようにレーザーにより外周の端材部8がトリミングされ、除去される。
【0048】
成形型30から脱型した後、例えば常圧下、50乃至80℃で3乃至24時間程度、養生、乾燥することが望ましい。成形型30から脱型した後、トリミングする場合は、養生・乾燥前或いは後のどちらでも行うことが出来る。
【0049】
前記のように脱型前或いは脱型後の養生、乾燥前或いは養生、乾燥後に前記外周の端材部8をトリミングすれば、図1乃至3に示す表皮付きポリオレフィン系樹脂型内発泡成形体1を得ることができる。
【0050】
以上のように、前記ポリオレフィン系樹脂発泡ビーズ32を予備加熱をし、水蒸気Sにより蒸らした後、本加熱すれば、ポリオレフィン系樹脂発泡ビーズ32からポリオレフィン系樹脂型内発泡成形体2を製造するのと同時に、該ポリオレフィン系樹脂型内発泡成形体2と前記TPO表皮材6を強固に融着一体化でき、しかも、前記ポリオレフィン系樹脂型内発泡成形体2にはポリオレフィン系樹脂発泡ビーズ32の融着不良の発生がなく、表皮末端が折り返され、更に成形体外周より内側で表皮端材部がトリミングされた、成形体外周部の外観の良い、表皮付きポリオレフィン系樹脂型内発泡成形体1を製造することができる。
【0051】
図3,10,13に示す、表皮付きポリオレフィン系樹脂型内発泡成形体1は、前記実施形態において、前記TPO表皮材6を前記一方の金型19の表面19cに配置後,型締め開始から加熱開始前迄の間に折り返し枠16を後退させ、その後更に型締めし、前記表皮材6の折り返し部4と折り戻し部5を折り重ねるように、成形したものである。
【0052】
なお、上記実施形態においては、前記一方の金型19が、横断面が凹状に形成された凹型(雌型)で且つ、下型ある場合について説明したが、これに限定されるものではなく、前記一方の金型が凸型(雄型)で、且つ、他方の金型20が凹型(雌型)であってもよいし、前記一方の金型19が上型であってもよい。更に、金型30が垂直方向に型開きするものを例示したが、金型30が水平方向に型開きする場合であってもよい。
【0053】
次に、この発明を実施例により更に詳細に説明するが、この発明に係る実施例に限定されるものではない。
【0054】
〔実施例1〜6〕成形型を構成する雌型と雄型のうち、前記雌型に表皮材を真空成形することにより配置した後、この成形型内で発泡成形した。前記雌型のキャビティ面を構成する部分の内部には、熱媒体が流れる流路を蛇行した状態で形成しておき、この流路に水蒸気を流すことによりキャビティ面を表1に示す温度に保持した。なお、前記雄型には、発泡成形時に成形型内へ水蒸気を供給するための蒸気孔と、発泡ビーズを充填するためのフィーダーを設けた。
【0055】
ここで、前記表皮材としてはポリオレフィン系熱可塑性樹脂シート(TPOシート)を用い、これを加熱軟化後、前記雌型に配置し、真空ポンプを用いて賦形した。発泡ビーズとしてはエペランPP(鐘淵化学工業社製,商品名,発泡倍率15倍,あらかじめ耐圧容器内で空気圧により内圧2Kg/cm2・Gを付与したもの)を用い、型締めした後、この発泡ビーズを前記フィーダーを介して成形型内へ充填した。なお、折り返し枠を後退させる場合は、充填終了後行った。
【0056】
発泡ビーズの充填後は、前記雄型に形成した蒸気孔から水蒸気(蒸気圧1.5Kg/cm2・G )を成形型内へ供給して予備加熱を行い、発泡ビーズの蒸らしを行ってから、真空ポンプを用いてドレイン及び水蒸気を吸引、除去した。その後、再び前記蒸気孔から水蒸気(蒸気圧3.2〜3.7Kg/cm2・G )を成形型内へ供給して本加熱した後、水冷し、次いで型開きして表皮付き型内発泡成形体を得た。
【0057】
該表皮付き型内発泡成形体の表皮端材を、成形型内でトリミングする場合は、前記雌型に該成形体を保持したまま型開きし、レーザーにて該表皮端材部をトリミングした。
【0058】
該表皮付き型内発泡成形体の表皮端材を、成形型外でトリミングする場合は、該成形体を雌型から脱型した後、該成形体を位置決めジグ(金型)に固定した後、レーザーにて該表皮端材部をトリミングした。
【0059】
〔比較例1〜5〕比較例1で折り返し枠を使用しなかった事以外、実施例1〜6と同様にして表皮付き型内発泡成形体を得た後。成形型外で該表皮端材部のトリミングを行った。
【0060】
トリミング後の表皮付き型内発泡成形体の意匠性、及び外周部の意匠性を評価し表1に示した。
【0061】
【表1】

Figure 0004597410
【0062】
【発明の効果】
本発明の、表皮付き型内発泡成形体の表皮端材処理方法によれば、表皮材を型内発泡成形体の外周部に沿って折り返し、該発泡体に融着一体化した後に、該表皮付き型内発泡体を損なうことなく、表皮端材を簡単にトリミング、除去出来る。人手を要しないから大幅なコスト低減ができる。
【図面の簡単な説明】
【図1】図9に示す成形体の、表皮材の不要な外周部を切除した後の状態を示す断面図
【図2】図9に示す成形体の、表皮材の不要な外周部を切除した後の状態を示す断面図
【図3】図10に示す成形体の、表皮材の不要な外周部を切除した後の状態を示す断面図
【図4】表皮材を真空成形し、クラッキング型締めした状態を示す断面図
【図5】成形型内に発泡ビーズを充填する様子を示す断面図
【図6】成形型で発泡ビーズを加熱する様子を示す断面図
【図7】ドレインを除去する様子を示す断面図
【図8】成形型に成形体が保持されている様子を示す断面図
【図9】表皮付き型内発泡成形体を脱型した状態を示す断面図
【図10】図14に示す表皮付き型内発泡成形体を、脱型した状態を示す断面図
【図11】図9の表皮材の不要な外周部を切断した状態を示す断面図
【図12】図9の表皮材の不要な外周部を切断した状態を示す断面図
【図13】図10の表皮材の不要な外周部を切断した状態を示す断面図
【図14】発泡成形時に折り返し枠を後退させて成形し、成形型に成形体が保持されている様子を示す断面図
【符号の説明】
1 表皮付き型内発泡成形体
2 型内発泡成形体
1 表面部
2 折り返し部
4a 基端
4b 先端
5 折り戻し部
1 表皮材
8 表皮材外周部(表皮端材部)
16 折り返し枠
19 一方の金型
19a チャンバー
19b 減圧孔
19c 表面
20 他方の金型
20a チャンバー
20b 蒸気孔
20c 表面
22 フィーダー
30 成形型
31 成形型内
32 発泡ビーズ
A1 蒸気弁
A2 蒸気弁
B1 減圧弁
B2 減圧弁
C1 ドレイン弁
C2 ドレイン弁
L1 表皮端材カット部(折り戻し部)
L2 表皮端材カット部(折り返し部)[0001]
BACKGROUND OF THE INVENTION
With this invention, a part or all of the outer peripheral portion of the skin material fused and integrated with the surface of the in-mold foam molded body is folded inward to be fused and integrated with the back surface of the in-mold foam molded body. The present invention relates to a method for treating a skin end material of an in-mold foam molding.
[0002]
[Prior art]
As a conventional technique of this type, for example, there is a simultaneous molding method of a skin material disclosed in JP-A-62-108039. In this method, after performing vacuum forming of the skin material along the female mold among the pair of male and female molds, foam molding is performed in a mold space formed between the male mold and the skin material, and molding is performed. In the simultaneous molding method of the skin material in which the foamed molded product and the skin material are integrally joined, the outer peripheral portion of the skin material along the folded mold that protrudes from the outer periphery of the female die into the mold at the time of vacuum molding of the skin material. Then, it is folded back from the outer peripheral edge of the mold to the back surface side, and at the time of foam molding, the folded portion of the skin material is integrally joined to the outer peripheral back surface of the foam molded product. However, as shown in FIG. 9 to FIG. 10, the outer peripheral portion of the skin material is erected with respect to the back surface of the foam molded product in the vicinity of the tip of the folded portion. When trimming the outer peripheral portion, it must be performed manually as usual, and the trimming operation is difficult, so that a protruding ear portion having a predetermined length may remain.
[0003]
On the other hand, for example, there is a skin trimming method in simultaneous molding of a skin material disclosed in Japanese Utility Model Laid-Open No. 61-201826. In this method, there is provided one mold for holding the skin and a mold on the other side which is combined with the mold to form a base molding cavity behind the skin, and the other mold is held by one mold. By providing a cutting blade for trimming the periphery of the formed skin, when the two molds are combined, the skin held in one mold is trimmed by the engagement action between the cutting blade and the groove. However, the present invention has a drawback in that when the skin end is folded back, trimming cannot be performed inside the molded product rather than the outer periphery where the skin end is folded back.
[0004]
[Problems to be solved by the invention]
This invention has been made in view of the above problems, and the skin of the in-mold foam-molded body with skin is folded inward from the edge of the surface-molded foam-molded body with skin, In-mold foam molding with skin comprising a skin material, one surface of which is a folded portion fixed to the back surface of the in-mold foam molded body with skin, and a folded portion folded back outward from the leading end of the folding. It is an object of the present invention to provide a method for easily trimming a folded portion, which is folded back outward from the folded tip, inside the edge of the surface portion of the in-mold foam molded body.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the means of claim 1 is arranged so as to protrude inwardly from the opening edge of the entire circumference or part of the one mold surface during thermoforming of the skin material. Wrapping frame The outer peripheral portion of the skin material is folded inwardly to form a folded portion, and then the foaming is performed and one surface of the folded portion is fused and integrated with the back surface of the foam in the mold, and then the mold is formed. From the tip of the folded part of the in-mold foam molded product with a skin held on one mold Of the skin material Folded part with outer periphery folded back outward In, inward from the position where the perpendicular line descending from the base end of the folded portion intersects It is to cut with a laser.
[0006]
According to the second aspect of the present invention, when the skin end material of the folded portion is cut, the folding mold is retracted from the laser cutting portion.
[0007]
According to a third aspect of the present invention, when the skin material is thermoformed, the folding is arranged so as to protrude inwardly from the opening edge of the entire circumference or part of the one mold surface. frame The outer peripheral portion of the skin material is folded inwardly to form a folded portion, and then folded. frame Is retreated from the inside of the opening end of the one mold surface, the mold is clamped, the foam molding is performed, and one surface of the folded portion is fused and integrated with the back surface of the foam in the mold, and then the mold From the tip of the folded part of the in-mold foam molded product with a skin held on one mold Of the skin material Folded part with outer periphery folded back outward In, inward from the position where the perpendicular line descending from the base end of the folded portion intersects It is to cut with a laser.
[0008]
According to a fourth aspect of the present invention, at the time of the thermoforming, the folding is arranged so as to protrude inwardly from the opening edge of the entire circumference or part of the one mold surface. frame The outer peripheral portion of the skin material is folded inwardly to form a folded portion, and then folded. frame Is retreated from the inside of the opening end of the one mold surface, the mold is clamped, the foam molding is performed, and one surface of the folded portion is fused and integrated with the back surface of the foam in the mold, and then the mold Open After removing the in-mold foam molded body with a skin, The in-mold foam molded body with the skin with the folded part formed is released from one mold, and then fixed to the positioning jig, from the tip of the folded part. Of the skin material Folded part with outer periphery folded back outward In, inward from the position where the perpendicular line descending from the base end of the folded portion intersects It is to cut with a laser.
[0009]
According to a fifth aspect of the present invention, when the skin material is thermoformed, the folding is arranged so as to protrude inwardly from the opening edge of the entire circumference or part of the one mold surface. frame The outer peripheral portion of the skin material is folded inwardly to form a folded portion, and then the foaming is performed and one surface of the folded portion is fused and integrated with the back surface of the foam in the mold, and then the mold is formed. Open After removing the in-mold foam molded body with a skin, The in-mold foam molded body with the skin with the folded part formed is released from one mold, and then fixed to the positioning jig, from the tip of the folded part. Of the skin material Folded part with outer periphery folded back outward In, inward from the position where the perpendicular line descending from the base end of the folded portion intersects It is to cut with a laser.
[0010]
The means of claim 6 is: Further, in the folded portion, at a position inward from the base end of the folded portion, It is to cut with a laser.
[0011]
The means of claim 7 is that the laser used for cutting is a YAG laser.
[0012]
The means of claim 8 is that the in-mold foam molded article is an olefin resin in-mold foam molded article.
[0013]
The means of claim 9 is that the olefin-based resin-in-mold foam-molded product is colorless (natural).
[0014]
The means of claim 10 is that the olefin resin in-mold foam molded product is a polypropylene resin in-mold foam molded product.
[0015]
The means of claim 11 is that the skin material is an olefinic thermoplastic elastomer sheet.
[0016]
The means of claim 12 is that the olefinic thermoplastic elastomer sheet is a polypropylene thermoplastic elastomer sheet.
[0017]
The means of claim 13 is that the skin material is a colored olefinic thermoplastic elastomer sheet.
[0018]
The means of claim 14 is that the skin material is composed of at least one skin layer.
[0019]
The means of claim 15 is that the skin material has at least one colored foamed resin layer.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1 to FIG. 3 and FIG. 11 to FIG. 13, an in-mold foam molded body 1 with a skin according to the embodiment includes, for example, an in-mold foam molded body 2 having a substantially U-shaped cross section. And a skin material 6 comprising a surface portion 3, a folded portion 4 and a folded portion 5, and a predetermined position L1 inward from a base end 4a of the folded portion 4 in the folded portion 5, or further, the folded portion. The predetermined position L2 inward from the base end 4a of 4 is also cut with a laser, and the outer peripheral portion 8 is removed.
The in-mold foam molded body 2 is obtained by foam-molding (in-mold foaming) foamed beads made of synthetic resin in a mold.
[0021]
Examples of the skin material 6 include a thermoplastic resin sheet made of a vinyl chloride resin, or a polyolefin resin such as a polyethylene resin or a polypropylene resin. In addition, since this skin material 6 is used as a skin of the said in-mold foam-molded body 1 with a skin, what is necessary is just to color in a desired color beforehand with a coloring agent etc. according to the use.
Of the skin material 6, the skin portion 3 is fixed to the surface of the in-mold foam molded body 2. The folded portion 4 is folded inward from the edge of the surface portion 3 and one surface thereof is fixed to the in-mold foam molded body 2. Examples of a method for fixing the surface portion 3 and the folded portion 4 to the in-mold foamed molded body 2 include fusion by heat, adhesion by an adhesive, or a combination thereof.
In FIG. 13, the folded portion 5 overlaps the other surface 4 c of the folded portion 4 outward from the distal end 4 b of the folded portion, and its distal end is outward from the base end 4 a of the folded portion 4. It is folded back so as to protrude, and a predetermined position L1 inward from the proximal end 4a of the folded portion 4 in the folded portion 5 or a predetermined position L2 inward from the proximal end 4a of the folded portion 4 is formed. Also, the outer peripheral portion 8 is removed by cutting with a laser.
[0022]
【Example】
The polyolefin resin in-mold foam molding 2 is formed by foaming polyolefin resin foam beads in a mold. Examples of the polyolefin resin include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer, propylene homopolymer, ethylene-propylene random copolymer, ethylene- Polyethylene such as propylene block copolymer, ethylene-propylene-butene random terpolymer, propylene-vinyl chloride copolymer, propylene-butene copolymer, propylene-maleic anhydride copolymer, poly (butene-1) Resin, polypropylene resin and the like, and these can be used alone or in admixture of two or more.
[0023]
This polyolefin-based resin is preferably in a non-crosslinked state, but may be crosslinked by peroxide or radiation.
[0024]
Moreover, what mixed the other thermoplastic resin with this polyolefin resin can also be used. Examples of such thermoplastic resins include, when mixed with the polypropylene resin, low density polyethylene, linear low density polyethylene, vinyl aromatic polymer, polybutene, and ionomer. And when mixing with the said polyethylene-type resin, vinyl aromatic polymer, polybutene, an ionomer etc. are mentioned, for example. In these cases, the amount of the thermoplastic resin blended is preferably 20 parts by weight or less, more preferably 5 to 10 parts by weight with respect to 100 parts by weight of the polyolefin resin.
[0025]
The polyolefin-based resin foam beads may be prepared by, for example, molding the polyolefin-based resin as described above into particles in advance, and adding the volatile foaming agent to the polyolefin-based resin particles in a pressure-resistant container, And after heating to a predetermined foaming temperature under pressure, the aqueous dispersion may be preliminarily foamed by a method such as discharging into a low pressure region.
When the polyolefin resin foam beads are foamed in the mold, if the foaming ratio is less than 3 times, the cushioning property and the like of the obtained polyolefin resin in-mold foam molded product tends to decrease, and from 60 times If it is large, the shrinkage of the polyolefin resin-in-mold foam-molded body tends to increase, and it tends to be too soft and the strength and the like decrease, so 3 to 60 times, preferably 5 to 50 times, more preferably 8 to 45 times, particularly preferably 10 to 35 times is desirable. As such polyolefin resin foam beads, for example, Eperan PP (trade name, manufactured by Kaneka Chemical Industry Co., Ltd., foaming magnification: 15 times) can be suitably used.
[0026]
Next, a manufacturing method of the above-mentioned polyolefin resin-in-mold foam-molded body 1 with a skin will be described. As shown in FIGS. 4 to 8, the manufacturing method of the polyolefin resin-in-mold foam-molded body 1 with a skin according to this embodiment is one of the two molds 19 and 20 constituting the mold 30. After the TPO skin material 6 is placed in the mold 19 and clamped, the inside of the mold 31 is filled with polyolefin resin foam beads 32, and these polyolefin resin foam beads 32 are foamed by steam heating and fused together. These polyolefin resin foam beads 32 and the TPO skin material 6 are fused and integrated.
[0027]
That is, as shown in FIG. 4, first, the TPO skin material 6 is placed on the one mold 19 and the mold is clamped.
[0028]
Here, the mold 30 is composed of, for example, two molds 19 and 20 that can be clamped and opened in the vertical direction.
[0029]
The one of the two molds 19 and 20 has, for example, a concave cross section and a chamber 19a formed therein, and a plurality of surfaces communicating with the chamber 19a are formed on the surface 19c side. A decompression hole 19b is formed. A steam valve A1, a pressure reducing valve B1, and a drain valve C1 are connected to the chamber 19a.
[0030]
The other mold 20 has, for example, a convex cross section and a chamber 20a formed therein, and a plurality of vapor holes 20b communicating with the chamber 20a are formed on the surface 20c side. A steam valve A2, a pressure reducing valve B2, and a drain valve C2 are connected to the chamber 20a, and a feeder 22 for filling the polyolefin resin foam beads 32 into the mold 31 is provided. .
[0031]
In order to arrange the TPO skin material 6 on the surface 19c of one mold 19, the TPO skin material 6 is molded in advance so as to conform to the shape of the surface 19c of the one mold 19 by vacuum forming or the like. It may be arranged, or in the case of flexibility, it may be arranged by inserting into the mold 31 and performing vacuum forming or the like.
[0032]
Here, when the obtained polyolefin resin-in-mold foam-molded body 1 with an outer skin requires, for example, a fixture for attaching to another member, the surface 20c of the other mold 20 has a predetermined shape in advance. The insert member (not shown) is arranged so that when the polyolefin resin foam beads 32 are foamed in the mold, the insert member and the polyolefin resin in-mold foam molded body 2 are integrated. May be.
[0033]
Next, as shown in FIG. 5, polyolefin resin foam beads 32 are filled into the mold 31 from the feeder 22.
[0034]
At this time, the TPO skin material 6 is disposed on the surface 19c of the one mold 19, and in the clamped state, air in the mold 31 escapes only from the vapor hole 20b of the other mold 20. Therefore, in order to facilitate the filling of the polyolefin resin foam beads 32, the mold may be slightly opened so that the polyolefin resin foam beads 32 do not fall during filling, and the air may be allowed to escape from the gap.
[0035]
The polyolefin-based resin foam beads 32 may be filled in the mold 31 in a state where an internal pressure is applied by infiltrating the pressurized gas into the interior in advance, or compressed using the pressurized gas. It may be filled in a state, or it may be filled as it is without applying internal pressure or compression.
[0036]
Thereafter, as shown in FIG. 6, the steam valve A2 connected to the chamber 20a of the other mold 20 is opened to supply the steam S from the steam hole 20b to the inside 31 of the mold, and the polyolefin resin foam beads 32 The foam is heated and foamed.
[0037]
At this time, before the main heating of the polyolefin resin foam beads 32 at a temperature equal to or higher than the temperature at which the polyolefin resin foam beads 32 are fused together, the polyolefin resin foam beads 32 at a temperature lower than the temperature at which the polyolefin resin foam beads 32 are fused together. Is preheated in advance, the polyolefin resin foam beads 32 can be sufficiently heated without being fused to each other.
[0038]
The temperature at which the polyolefin resin foam beads 32 are fused to each other is that the polyolefin resin foam beads 32 are filled into the molding die 31 having a depth of about 50 mm and steam S at a predetermined temperature (predetermined pressure) is 10. It means a minimum temperature at which the polyolefin resin foam beads 32 are fused to each other and can maintain the shape of the polyolefin resin in-mold foam 2 when supplied to the mold 31 for 20 seconds.
[0039]
The temperature at which the polyolefin resin foam beads 32 are fused to each other varies depending on the type of polyolefin resin to be used, etc. Therefore, after checking this temperature in advance, the temperature of the water vapor S during the preheating is set. Good. If the temperature of the water vapor S is too low, the effect of preheating tends not to be sufficiently exhibited. Therefore, when the temperature at which the polyolefin resin foam beads 8 are fused to each other is T (° C.), (T-35) to T (° C.), preferably (T-30) to (T-3) (° C.), more preferably (T-25) to (T-5) (° C.). Is desirable. Moreover, what is necessary is just to adjust the pressure of the said water vapor | steam S suitably so that it may become said temperature range.
[0040]
Further, after preheating as described above, if the polyolefin resin foam beads 32 are steamed with the steam S while being kept in that state for a predetermined time, the steam S supplied between the polyolefin resin foam beads 32 is maintained. This latent heat can be effectively utilized, and therefore there is an advantage that the polyolefin resin foam beads 8 can be heated more uniformly, particularly when the foamed molded resin product 2 having a large thickness is molded.
[0041]
In addition, after preheating, you may steam in the state which continued supply of the water vapor | steam S, or you may stop the supply of the water vapor | steam S, and may also steam in the state which opened the drain valve C2 as needed. The holding time at the time of steaming varies depending on the thickness of the polyolefin resin foam beads 32 in the mold 31, the size and shape of the polyolefin resin foam beads 32, the expansion ratio, etc. When the thickness of the resin-based resin foam beads 32 layer is about 50 mm, it is desirable that the thickness be about 3 seconds or longer, preferably about 5 seconds or longer, more preferably about 10 seconds or longer.
[0042]
After the polyolefin resin foam beads 32 are steamed with water vapor S, there is a drain (water) between the polyolefin resin foam beads 32, and if heated in this state, the polyolefin resin foam beads 32 are fused together. Since a defect may occur, it is desirable to remove the drain.
[0043]
As a method for removing this drain, for example, as shown in FIG. 7, a method is used in which the pressure reducing valve B2 connected to the chamber 20a of the other mold 20 is opened and the inside of the mold 31 is evacuated from the vapor hole 20b. Alternatively, the mold 30 is opened slightly to provide a gap between the two molds 19 and 20, and the air dried at a high temperature so that the polyolefin resin foam beads 32 are not fused to each other from the vapor hole 20b. For example, a method of removing the drain from the gap by aeration.
[0044]
Next, the main heating is performed at a temperature equal to or higher than the temperature at which the polyolefin resin foam beads 32 are fused to each other. As shown in FIG. 8, the main heating is performed by opening the steam valve A2 and supplying the steam S to the inside 31 of the mold through the steam holes 20b. At this time, as described above, when the inside of the mold 31 is evacuated in order to remove the drain after steaming with the steam S, the steam S for the main heating is more smoothly performed. It can be supplied to the mold 31.
[0045]
In addition, the temperature of the water vapor S at this time may be equal to or higher than the temperature at which the polyolefin resin foam beads 8 are fused to each other, but if it is too high, the shrinkage of the resulting polyolefin resin in-mold foam molding 2 is reduced. Therefore, it is desirable not to exceed a temperature that is 30 ° C. higher, preferably 25 ° C. higher than the temperature at which the polyolefin resin foam beads 8 are fused to each other.
[0046]
After the main heating as described above, it is desirable to maintain the state in order to sufficiently transfer the heat generated by the water vapor S to the polyolefin resin foam beads 32. The time required for holding at this time is, for example, about 2 seconds or more, preferably about 5 seconds or more for a polyolefin resin foam bead 32 layer having a thickness of about 50 mm. Is too long, shrinkage occurs in the resulting polyolefin resin-in-mold foam-molded molded body 2, and therefore, it may be appropriately set within a range in which such shrinkage does not occur.
[0047]
Next, when the mold 30 is opened, as shown in FIGS. 9 and 10, a polyolefin resin-in-mold foam-molded body 1 with a skin having a folded portion 5 is obtained.
The mold 30 may be cooled in advance before opening the mold. Next, the obtained polyolefin resin-in-mold foam-molded body 1 with an outer skin was subjected to laser cutting of the peripheral end material portion 8 by laser as shown in FIGS. 11 to 13 before or after being removed from the mold 30. Trimmed and removed.
[0048]
After removing from the mold 30, it is desirable to cure and dry at 50 to 80 ° C. for 3 to 24 hours under normal pressure. When trimming after removing from the mold 30, it can be performed either before or after curing and drying.
[0049]
As described above, if the outer peripheral end material 8 is trimmed before or after demolding, before or after drying, or after curing and drying, the polyolefin resin-in-mold foam-molded body 1 with a skin shown in FIGS. Can be obtained.
[0050]
As described above, the polyolefin resin foam beads 32 are preheated, steamed with steam S, and then heated to produce the polyolefin resin foam-in-mold foam 2 from the polyolefin resin foam beads 32. At the same time, the polyolefin resin-in-mold foam-molded body 2 and the TPO skin material 6 can be firmly fused and integrated. A polyolefin resin-in-mold foam-molded molded body 1 with a skin having a good appearance at the outer periphery of the molded body, in which the end of the skin is folded back and the outer skin end material is trimmed inside the outer periphery of the molded body without occurrence of poor adhesion Can be manufactured.
[0051]
3, 10, and 13, the polyolefin resin-in-mold-in-mold foam-molded body 1 with a skin, after the TPO skin material 6 is placed on the surface 19 c of the one mold 19 in the above embodiment, from the start of mold clamping. The folding frame 16 is retracted before the start of heating, and then the mold is further clamped so that the folded portion 4 and the folded portion 5 of the skin material 6 are folded.
[0052]
In the above embodiment, the case where the one mold 19 is a concave mold (female mold) having a concave cross section and a lower mold has been described. However, the present invention is not limited to this. The one mold may be a convex mold (male mold), the other mold 20 may be a concave mold (female mold), and the one mold 19 may be an upper mold. Furthermore, although the example in which the mold 30 is opened in the vertical direction has been illustrated, the mold 30 may be opened in the horizontal direction.
[0053]
EXAMPLES Next, although an Example demonstrates this invention still in detail, it is not limited to the Example based on this invention.
[0054]
[Examples 1 to 6] Of the female mold and male mold constituting the mold, the skin material was placed on the female mold by vacuum molding, and then foam molding was performed in the mold. Inside the portion constituting the female cavity surface, a flow path through which the heat medium flows is formed in a meandering state, and the cavity surface is maintained at the temperature shown in Table 1 by flowing water vapor through the flow path. did. The male mold was provided with a steam hole for supplying water vapor into the mold during foam molding and a feeder for filling the foam beads.
[0055]
Here, a polyolefin-based thermoplastic resin sheet (TPO sheet) was used as the skin material, which was heat-softened, placed in the female mold, and shaped using a vacuum pump. Eperan PP (manufactured by Kaneka Chemical Co., Ltd., product name, expansion ratio of 15 times, expanded pressure is 2 Kg / cm in advance by air pressure in a pressure vessel. 2 After the mold was clamped using G), the foamed beads were filled into the mold through the feeder. Note that the folding frame was moved backward after filling.
[0056]
After filling with the foam beads, water vapor (vapor pressure 1.5 kg / cm) is formed from the vapor hole formed in the male mold. 2 G) was supplied into the mold and pre-heated to foam the foamed beads, and then the drain and water vapor were sucked and removed using a vacuum pump. Thereafter, water vapor (vapor pressure: 3.2 to 3.7 kg / cm 2) again from the vapor hole. 2 G) was supplied into the mold and heated, followed by water cooling, and then mold opening to obtain an in-mold foam molded body with a skin.
[0057]
When trimming the skin end material of the in-mold foam-molded body with skin within the mold, the skin end material was trimmed with a laser by opening the mold while holding the molded body on the female mold.
[0058]
When trimming the skin end material of the in-mold foam-molded body with the skin outside the mold, after the molded body is removed from the female mold, the molded body is fixed to a positioning jig (die), The skin end material portion was trimmed with a laser.
[0059]
[Comparative Examples 1 to 5] After obtaining an in-mold foam-molded article with a skin in the same manner as in Examples 1 to 6 except that the folding frame was not used in Comparative Example 1. Trimming of the skin end material portion was performed outside the mold.
[0060]
The design properties of the in-mold foam-molded body with skin after trimming and the design properties of the outer periphery were evaluated and shown in Table 1.
[0061]
[Table 1]
Figure 0004597410
[0062]
【The invention's effect】
According to the method for treating the skin end material of an in-mold foam molded body with a skin according to the present invention, the skin material is folded along the outer peripheral portion of the in-mold foam molded body and fused and integrated with the foam. The trim material can be easily trimmed and removed without damaging the in-mold foam. Since no manpower is required, the cost can be greatly reduced.
[Brief description of the drawings]
1 is a cross-sectional view showing a state of the molded body shown in FIG. 9 after an unnecessary outer peripheral portion of a skin material is cut away;
2 is a cross-sectional view showing a state of the molded body shown in FIG. 9 after an unnecessary outer peripheral portion of the skin material is cut away.
3 is a cross-sectional view showing a state of the molded body shown in FIG. 10 after an unnecessary outer peripheral portion of the skin material is cut away.
FIG. 4 is a cross-sectional view showing a state in which a skin material is vacuum-formed and cracked.
FIG. 5 is a cross-sectional view showing a state in which foam beads are filled in a mold.
FIG. 6 is a cross-sectional view showing a state where foamed beads are heated with a mold
FIG. 7 is a sectional view showing how the drain is removed.
FIG. 8 is a cross-sectional view showing a state where a molded body is held in a mold.
FIG. 9 is a cross-sectional view showing a state where an in-mold foam molded body with a skin is removed.
FIG. 10 is a cross-sectional view showing a state where the in-mold foam-molded body with a skin shown in FIG.
11 is a sectional view showing a state in which an unnecessary outer peripheral portion of the skin material of FIG. 9 is cut.
12 is a cross-sectional view showing a state in which an unnecessary outer peripheral portion of the skin material of FIG. 9 is cut.
13 is a cross-sectional view showing a state in which an unnecessary outer peripheral portion of the skin material of FIG. 10 is cut.
FIG. 14 is a cross-sectional view showing a state in which a molded body is held in a molding die by molding by retracting a folding frame during foam molding.
[Explanation of symbols]
1 In-mold foam molding with skin
2 In-mold foam molding
1 Surface part
2 Folding part
4a Base end
4b Tip
5 Folding part
1 Skin material
8 Outer skin part (skin end material part)
16 Folding frame
19 One mold
19a chamber
19b decompression hole
19c surface
20 The other mold
20a chamber
20b Steam hole
20c surface
22 Feeder
30 Mold
31 Inside mold
32 Foam beads
A1 Steam valve
A2 Steam valve
B1 Pressure reducing valve
B2 Pressure reducing valve
C1 drain valve
C2 drain valve
L1 Skin end material cut part (fold back part)
L2 Skin end material cut part (folded part)

Claims (15)

成形型を構成する2つの金型のいずれか一方の金型面に沿って表皮材を熱成形した後、この成形型内で発泡成形することによって、成形される型内発泡成形体の表面に前記表皮材を融着一体化させる表皮付き型内発泡成形体の製造方法であって、
前記熱成形時に、前記一方の金型面の全周或いは部分の開口端縁から内方へ突出するように配置される折り返しに沿って、前記表皮材の外周部分を内方へ折り返して折り返し部を形成した後、前記発泡成形を行い前記折り返し部の一面を型内発泡体の裏面に融着一体化した後、金型を開け
一方の金型に保持された表皮付き型内発泡成形体の折り返し部の先端から前記表皮材の外周部分が外方へ折り戻された状態の折り戻し部において、前記折り返し部の基端より下ろした垂線が交差する位置よりも内方にて、レーザーで切断する、表皮端材の処理方法。
After the outer skin material is thermoformed along the mold surface of one of the two molds constituting the mold, foam molding is performed on the surface of the in-mold foam molded body to be molded. A method for producing an in-mold foam-molded article with a skin for fusing and integrating the skin material,
At the time of the thermoforming, the outer peripheral portion of the skin material is folded inward along the folding frame arranged so as to protrude inwardly from the entire circumference or part of the opening edge of the one mold surface. After forming the part, after performing the foam molding and fusing and integrating one surface of the folded portion to the back surface of the foam in the mold, open the mold ,
In the folded portion where the outer peripheral portion of the skin material is folded outward from the tip of the folded portion of the in-mold foam-molded body with skin held by one mold, the lower portion is lowered from the base end of the folded portion. A method for treating skin edge material, which is cut with a laser inward from the position where the perpendicular intersects .
折り返し部の表皮端材を切断する場合に、折り返し枠をレーザー切断部より後退させておく、請求項1記載の表皮端材の処理方法。The method for treating a skin end material according to claim 1, wherein when the skin end material of the folded portion is cut, the folded frame is retracted from the laser cutting portion. 成形型を構成する2つの金型のいずれか一方の金型面に沿って表皮材を熱成形した後、この成形型内で発泡成形することによって、成形される型内発泡成形体の表面に前記表皮材を融着一体化させる表皮付き型内発泡成形体の製造方法であって、
前記熱成形時に、前記一方の金型面の全周或いは部分の開口端縁から内方へ突出するように配置される折り返しに沿って、前記表皮材の外周部分を内方へ折り返して折り返し部を形成した後、折り返しを前記一方の金型面の開口端部内方から後退させ、成形型を型締めし、前記発泡成形を行い前記折り返し部の一面を型内発泡体の裏面に融着一体化した後、金型を開け
一方の金型に保持された表皮付き型内発泡成形体の折り返し部の先端から前記表皮材の外周部分が外方へ折り戻された状態の折り戻し部において、前記折り返し部の基端より下ろした垂線が交差する位置よりも内方にて、レーザーで切断する、表皮端材の処理方法。
After the outer skin material is thermoformed along the mold surface of one of the two molds constituting the mold, foam molding is performed on the surface of the in-mold foam molded body to be molded. A method for producing an in-mold foam-molded article with a skin for fusing and integrating the skin material,
At the time of the thermoforming, the outer peripheral portion of the skin material is folded inward along the folding frame arranged so as to protrude inwardly from the entire circumference or part of the opening edge of the one mold surface. After forming the part, the folding frame is retracted from the inside of the opening end of the one mold surface, the mold is clamped, the foaming is performed, and one surface of the folded part is fused to the back surface of the foam in the mold. After wearing, open the mold ,
In the folded portion where the outer peripheral portion of the skin material is folded outward from the tip of the folded portion of the in-mold foam-molded body with skin held by one mold, the lower portion is lowered from the base end of the folded portion. A method for treating skin edge material, which is cut with a laser inward from the position where the perpendicular intersects .
成形型を構成する2つの金型のいずれか一方の金型面に沿って表皮材を熱成形した後、この成形型内で発泡成形することによって、成形される型内発泡成形体の表面に前記表皮材を融着一体化させる表皮付き型内発泡成形体の製造方法であって、
前記熱成形時に、前記一方の金型面の全周或いは部分の開口端縁から内方へ突出するように配置される折り返しに沿って、前記表皮材の外周部分を内方へ折り返して折り返し部を形成した後、折り返しを前記一方の金型面の開口端部内方から後退させ、成形型を型締めし、前記発泡成形を行い前記折り返し部の一面を型内発泡体の裏面に融着一体化した後、金型を開け、折り返し部を形成した表皮付き型内発泡成形体を、一方の金型から型後、
位置決めジグに固定し、折り返し部の先端から前記表皮材の外周部分が外方へ折り戻された状態の折り戻し部において、前記折り返し部の基端より下ろした垂線が交差する位置よりも内方にて、レーザーで切断する、表皮端材の処理方法。
After the outer skin material is thermoformed along the mold surface of one of the two molds constituting the mold, foam molding is performed on the surface of the in-mold foam molded body to be molded. A method for producing an in-mold foam-molded article with a skin for fusing and integrating the skin material,
At the time of the thermoforming, the outer peripheral portion of the skin material is folded inward along the folding frame arranged so as to protrude inwardly from the entire circumference or part of the opening edge of the one mold surface. After forming the part, the folding frame is retracted from the inside of the opening end of the one mold surface, the mold is clamped, the foaming is performed, and one surface of the folded part is fused to the back surface of the foam in the mold. after wearing integrated the mold is opened, demolded after a skin-integrated type foamed articles obtained by forming the folded portion from the die,
In the folded part in a state where the outer peripheral portion of the skin material is folded outward from the front end of the folded part fixed to the positioning jig, it is inward from the position where the perpendicular line descending from the base end of the folded part intersects In this method, the skin edge material is cut with a laser.
成形型を構成する2つの金型のいずれか一方の金型面に沿って表皮材を熱成形した後、この成形型内で発泡成形することによって、成形される型内発泡成形体の表面に前記表皮材を融着一体化させる表皮付き型内発泡成形体の製造方法であって、
前記熱成形時に、前記一方の金型面の全周或いは部分の開口端縁から内方へ突出するように配置される折り返しに沿って、前記表皮材の外周部分を内方へ折り返して折り返し部を形成した後、前記発泡成形を行い前記折り返し部の一面を型内発泡体の裏面に融着一体化した後、金型を開け、折り返し部を形成した表皮付き型内発泡成形体を、一方の金型から型後、
位置決めジグに固定し、折り返し部の先端から前記表皮材の外周部分が外方へ折り戻された状態の折り戻し部において、前記折り返し部の基端より下ろした垂線が交差する位置よりも内方にて、レーザーで切断する、表皮端材の処理方法。
After the outer skin material is thermoformed along the mold surface of one of the two molds constituting the mold, foam molding is performed on the surface of the in-mold foam molded body to be molded. A method for producing an in-mold foam-molded article with a skin for fusing and integrating the skin material,
At the time of the thermoforming, the outer peripheral portion of the skin material is folded inward along the folding frame arranged so as to protrude inwardly from the entire circumference or part of the opening edge of the one mold surface. After forming the part, after performing the foam molding and fusing and integrating one side of the folded portion to the back surface of the foam in the mold, the mold is opened, the in-mold foam molded body with a skin having the folded portion, After demolding from one mold,
In the folded part in a state where the outer peripheral portion of the skin material is folded outward from the front end of the folded part fixed to the positioning jig, it is inward from the position where the perpendicular line descending from the base end of the folded part intersects In this method, the skin edge material is cut with a laser.
更に、前記折り返し部において、折り返し部の基端より内方にて、
レーザーで切断する請求2、3、4または5記載の表皮端材の処理方法。
Further, in the folded portion, inward from the base end of the folded portion,
Cutting with a laser, according to claim 2, 3, 4 or 5 processing method skin scraps according.
切断に使用するレーザーがYAGレーザーである請求項1,2、3、4または6記載の表皮端材の処理方法。Laser used for cutting is YAG laser, according to claim 1, 2, 3, 4, 5 or 6 treatment method of skin scraps according. 型内発泡成形体がオレフィン系樹脂型内発泡成形体である、請求項14、5、6または7記載の表皮端材の処理方法。The method for treating a skin end material according to claim 1 , 2 , 3 , 4 , 5 , 6 or 7 , wherein the in-mold foam molded article is an olefin resin in-mold foam molded article. オレフィン系樹脂型内発泡成形体が無色(ナチュラル)である請求項15,6,7または記載の表皮端材の処理方法。Olefin resin mold foamed articles are colorless (natural), according to claim 1, 2, 3, 4, 5, 6, 7, or method of processing the skin edge material according. オレフィン系樹脂型内発泡成形体が、ポリプロピレン系樹脂型内発泡成形体である、請求
項8または9記載の表皮端材の処理方法。
The method for treating a skin end material according to claim 8 or 9, wherein the olefin-based resin-molded foam-molded product is a polypropylene-based resin-molded foam-molded product.
表皮材がオレフィン系熱可塑性エラストマーシートである請求項1または10記載の表皮材の処理方法。The skin material is an olefinic thermoplastic elastomer sheet according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 treatment method of the skin material according. オレフィン系熱可塑性エラストマーシートがポリプロピレン系熱可塑性エラストマーシートである請求項11記載の表皮端材の処理方法。The method for treating a skin end material according to claim 11 , wherein the olefin-based thermoplastic elastomer sheet is a polypropylene-based thermoplastic elastomer sheet. 表皮材が着色されたオレフィン系熱可塑性エラストマーシートである請求項11または12記載の表皮端材の処理方法。The method for treating a skin end material according to claim 11 or 12 , wherein the skin material is a colored olefinic thermoplastic elastomer sheet. 表皮材が少なくとも1層以上の表皮層から構成されている請求項1101112または13記載の表皮端材の処理方法Skin material is constituted by at least one layer of the skin layer, according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13 process epidermal scraps according Method 表皮材が少なくとも1層以上の着色された発泡樹脂層を持つ、請求項110111213または14記載の表皮材の処理方法。The skin material according to claim 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 or 14 , wherein the skin material has at least one colored foamed resin layer. Processing method.
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JPH06344460A (en) * 1993-06-07 1994-12-20 Kanayama Kasei Kk Manufacture of foamed resin molded body with skin material
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