JP4290264B2 - Manufacturing method of laminate - Google Patents

Description

【０１３０】
（実施例３）
〔延伸ポリエチレン系樹脂シート〕
延伸ポリエチレン系樹脂シートは、実施例１と同様にして作製され、同様に表面粗面化されたものが用いられた。
【０１３１】
〔熱可塑性樹脂シート〕
熱可塑性樹脂シートは、実施例１と同様にして作製されたものが用いられた。
【０１３２】
〔圧接引抜装置〕
図３及び図４に示すように構成されている圧接引抜装置が用いられた。
先ず、水平軸ロール及び垂直軸ロールより、上記延伸ポリエチレンシート２０枚と熱可塑性樹脂シート２０枚が交互に積層されるように繰り出し、１３０℃に加熱された加熱引抜金型２１３に図５に示すように引き込み、加熱引抜金型２１３では１２ｋｇｆ／ｃｍ² の圧力が上記積層体に負荷され、この状態で、該積層体に５０ｋｇｆ／ｃｍ² の引抜力が加わるように引抜機２１４によって引き抜き、上記引抜力が負荷された状態で冷風機より１０℃の冷風を吹き付けることによって冷却して厚さ１．８ｍｍのＨ型積層体を作製した。
尚、加熱引抜金型２１３内面には、圧縮弾性率５０００ｋｇｆ／ｃｍ² のＰＴＦＥが用いられた。
【０１３３】
（実施例４）
実施例２の加熱引抜金型２１３に替えて図６に示す寸法の円管用加熱引抜金型２４０を用い、図３に示す繰出機より実施例３で用いた延伸ポリエチレンシート１５枚と熱可塑性樹脂シート１４枚が交互に積層されるように繰り出し、１３０℃に加熱された加熱引抜金型２４０にシートを丸めて引き込み、加熱引抜金型２４０では１３ｋｇｆ／ｃｍ²の圧力が上記積層体に負荷され、この状態で、該積層体に５０ｋｇｆ／ｃｍ² の引抜力が加わるように引抜機２１４によって引き抜き、実施例３と同様に冷却して厚さ２．７ｍｍの中空状積層体を作製した。
尚、コア金型２４２の外面には、圧縮弾性率５０００ｋｇｆ／ｃｍ² のＰＴＦＥを用いた。
【０１３４】
（実施例５）
実施例２の加熱引抜金型２１３に替えて図７に示す寸法の角管用加熱引抜金型２５０を用い、図３に示す繰出機より実施例３で用いた延伸ポリエチレンシート１５枚と熱可塑性樹脂シート１４枚が交互に積層されるように繰り出し、１３０℃に加熱された加熱引抜金型２４０にシートを丸めて引き込み、加熱引抜金型２５０では１３ｋｇｆ／ｃｍ²の圧力が上記積層体に負荷され、この状態で、該積層体に５０ｋｇｆ／ｃｍ² の引抜力が加わるように引抜機２１４によって引き抜き、実施例３と同様に冷却して厚さ２．７ｍｍの中空状積層体を作製した。
尚、コア金型２４２の外面には、圧縮弾性率５０００ｋｇｆ／ｃｍ² のＰＴＦＥを用いた。
【０１３５】
（比較例２）
金型内面に、圧縮弾性率２００００ｋｇｆ／ｃｍ² の炭素鋼材を用いたこと以外は実施例３と同じとした。
【０１３６】
加熱引抜金型２１３では４５ｋｇｆ／ｃｍ² の圧力が上記積層体に負荷され、この状態で、該積層体に１５０ｋｇｆ／ｃｍ² の引抜力が加わるように引抜機２１４によって引き抜き、厚さ１．８ｍｍのＨ型積層体を作製しようとしたが、延伸ポリエチレンシートが損傷し、作製が不可能であった。
【０１３７】
（比較例３）
コア金型外面に、圧縮弾性率１２０００ｋｇｆ／ｃｍ² のカーボン繊維強化ＰＴＦＥを用いたこと以外は実施例４と同じとした。
【０１３８】
加熱引抜金型２４０では４０ｋｇｆ／ｃｍ² の圧力が上記積層体に負荷され、この状態で、該積層体に１４０ｋｇｆ／ｃｍ² の引抜力が加わるように引抜機２１４によって引き抜き、厚さ２．７ｍｍの中空状積層体を作製しようとしたが、延伸ポリエチレンシートが損傷し、作製が不可能であった。
【０１３９】
（比較例４）
コア金型外面に、圧縮弾性率４００ｋｇｆ／ｃｍ² のエチレンプロピレンゴム（ＥＰＤＭ）を用いたこと以外は実施例５と同じとした。
【０１４０】
加熱引抜金型２５０では８ｋｇｆ／ｃｍ² の圧力が上記積層体に負荷され、この状態で、該積層体に６０ｋｇｆ／ｃｍ² の引抜力が加わるように引抜機２１４によって引き抜き、厚さ２．７ｍｍの中空状積層体を作製したが、製造開始後、間もなく、コア金型のＥＰＤＭが破損し、作製が不可能であった。
【０１４１】
上記実施例３〜５で得られた積層体の性能を評価するため、幅１０ｍｍ、長さ８０ｍｍの試験片を切り出し、曲げ強さ及び曲げ弾性率を、ＪＩＳ Ｋ ７１７１に準拠して測定した。尚、測定は支点間距離＝７０ｍｍで行った。測定結果は表２に示す。
【０１４２】
【表２】

【０１４３】
（実施例６）
〔共押出シートの作製〕
図８に示す共押出装置を用い、ポリオレフィン系樹脂及び熱可塑性樹脂として、高密度ポリエチレン｛融点１３５℃，メルトインデックス（以下、ＭＩと称し、無名数で表す）１ｇ／１０分｝と、これと別個に供給される該高密度ポリエチレン１００重量部に対し、各々３重量部のトリアリルシアヌレート（架橋助剤）及びベンゾフェノン（光開始剤）と均一に混合した樹脂を同方向２軸押出機３０５より、更にその片面及び両面に、直鎖状低密度ポリエチレン（融点１２３℃，ＭＩ＝０．８）を２層（片面）及び３層（両面）で他の同方向２軸押出機３０５より各々温度２００℃で押出し、Ｔダイにより厚さ３ｍｍのシートを共押出した。ここで、熱可塑性樹脂に直鎖状低密度ポリエチレンを用いたのは、高密度ポリエチレンに対して結晶構造が近く共押出時においてこれらの界面が共結晶化しやすく、そのため、高強度を得やすいためである。
【０１４４】
上記共押出シートを、加熱炉の前後に、繰出機及び引取機が設けられた延伸装置を用い、繰出速度１ｍ／分、引取速度３０ｍ／分（延伸倍率３０倍）、加熱温度１００℃の条件で延伸処理し、３層の延伸共押出シートにおいては延伸共押出シートの総厚みが０．１６ｍｍ、幅１２５ｍｍでそれぞれ高密度ポリエチレンの厚み０．１５ｍｍ、直鎖状低密度ポリエチレンの厚み０．００５ｍｍ、２層の延伸共押出シートにおいては延伸共押出シートの総厚みが０．１５５ｍｍで、それぞれ高密度ポリエチレンの厚み０．１５ｍｍ、直鎖状低密度ポリエチレンの厚み０．００５ｍｍの延伸共押出シートを作製した。
【０１４５】
上記延伸押出シート３１１を、図９に示される圧接引抜装置を用いて積層体を作製した。
先ず、上記３層延伸共押出シート２０枚を積層し、さらにその積層体の両面に２層の延伸共押出シートが、その延伸シートが外側に向くように積層されるように繰り出し、雄雌両金型３２１及び３２２共、１３０℃に加熱された引抜金型（加熱）３０２と、次いで、雄雌両金型共、２０℃に冷却された冷却金型３０３の間に挟み込み、引抜金型（加熱）３０２では１０ｋｇｆ／ｃｍ² 、引抜金型（冷却）３０３では１ｋｇｆ／ｃｍ² の圧力が上記積層体に負荷され、この状態で、該積層体に１００ｋｇｆ／ｃｍ² の引抜力が加わるように引抜機３０４によって引き抜き、厚さ３．５ｍｍの積層体を作製した。
【０１４６】
（実施例７）
実施例６において作製された２層の共押出シートを延伸し、高密度ポリエチレンの厚み０．１５ｍｍ、直鎖状低密度ポリエチレンの厚みを０．０５ｍｍとし、１９枚の２層延伸共押出シートを積層し、その片面に延伸された厚み０．１５ｍｍの延伸ポリエチレンシートが積層されるように繰り返し厚さ４ｍｍの積層体を作製した。
【０１４７】
（比較例５）
実施例６において、Ｔダイにより高密度ポリエチレンを厚さ３ｍｍで押し出した後、延伸し、高密度ポリエチレンの厚み０．１５ｍｍを作製し、またインフレーションにより直鎖状低密度ポリエチレンのシートを厚さ０．００５ｍｍで作製したが、直鎖状低密度ポリエチレンのシート厚さ０．００５ｍｍの成形時に破断し作製が不可能であった。
【０１４８】
（比較例６）
実施例６において、Ｔダイにより高密度ポリエチレンを厚さ３ｍｍで押し出した後、延伸し、高密度ポリエチレンの厚み０．１５ｍｍを作製し、またインフレーションにより直鎖状低密度ポリエチレンのシートを厚さ０．０１ｍｍで作製した後、延伸された高密度ポリエチレンシートに直鎖状低密度ポリエチレンのシートをラミネートしたが、ラミネート時において直鎖状低密度ポリエチレンのシートの厚さ０．０１ｍｍが薄いため、ラミネート時に溶融破断しラミネートが不可能であった。
【０１４９】
上記実施例６及び比較例５、６で得られた積層体の性能を評価するため、幅１０ｍｍ、長さ８０ｍｍの試験片を切り出し、曲げ強さ及び曲げ弾性率を、ＪＩＳＫ ７１７１に準拠して測定した。尚、測定は支点間距離＝７０ｍｍで行った。
【０１５０】
また、上記実施例６及び比較例５、６で得られた積層体の界面における接着製法を評価するため、積層体のピール試験を、接着ＪＩＳ Ｋ ６８５４Ｔ型はく離に準拠して行った。上記の測定結果を併せて表３に示す。
【０１５１】
【表３】

【０１５２】
（実施例８）
〔延伸ポリエチレン系樹脂シート〕
延伸ポリエチレン系樹脂シートは、実施例１と同様にして作製され、同様に表面粗面化されたものが用いられた。
【０１５３】
〔熱可塑性樹脂シート〕
熱可塑性樹脂シートは、実施例１と同様にして作製されたものが用いられた。
【０１５４】
上記延伸ポリエチレンシートと熱可塑性樹脂シートを、図１０に示される変形引抜装置を用いて積層体を作製した。
【０１５５】
先ず、上記延伸ポリエチレンシート２０枚と熱可塑性樹脂シート１９枚を交互に積層されるように繰り出し、１３０℃に加熱された引抜金型（加熱）４０２及び加熱変形金型４０３、次いで、２０℃に冷却された冷却金型４０４の間に挟み込み、引抜金型（加熱）４０２では１０ｋｇｆ／ｃｍ² 、また加熱変形金型４０３は２５０ｍｍの長さを４基揃え変形においては全長１０００ｍｍで断面に変形を加え、この状態で、引抜機４０５によって引き抜き、厚さ５ｍｍの積層体を作製した。
【０１５６】
（比較例７）
実施例８と同様の積層体構成とし、予め図１１に示す最終形状に変形させた後、その形状を保ったまま加熱金型を通過させて積層体を作製した。
【０１５７】
（比較例８）
実施例８と同様の積層体構成とし、加熱変形金型４０３では加熱温度を１００℃として積層体を作製した。
【０１５８】
上記実施例８及び比較例７、８で得られた積層体の性能を評価するため、幅１０ｍｍ、長さ８０ｍｍの試験片を切り出し、曲げ強さ及び曲げ弾性率を、ＪＩＳＫ ７１７１に準拠して測定した。尚、測定は支点間距離＝７０ｍｍで行った。測定結果は表４に示す。
【０１５９】
【表４】

【０１６０】
（実施例９）
〔延伸ポリエチレン系樹脂シート〕
延伸ポリエチレン系樹脂シートは、実施例１と同様にして作製され、同様に表面粗面化されたものが用いられた。
【０１６１】
〔熱可塑性樹脂シート〕
熱可塑性樹脂シートは、実施例１と同様にして作製されたものが用いられた。
【０１６２】
上記延伸ポリエチレンシートと熱可塑性樹脂シートを、図１３に示される周方向強化引抜装置を用いて積層体を作製した。
【０１６３】
先ず、上記延伸ポリエチレンシート２０枚と熱可塑性樹脂シート１９枚を交互に積層されるように繰り出し、上記延伸ポリエチレンシート及び熱可塑性樹脂シートを４群に分かち、その一群を予備賦形装置５２２により緩やかにスパイラル状に巻回しながら徐々に巻回度合いを強め、巻回機５０３によって進行方向に対して６０度の角度で巻回して円管状に賦形し、更に他の一群は次の予備賦形装置５３２によって進行方向に対して１２０度の角度で巻回して互いにその延伸方向が交差するように積層される。予備賦形装置５２４及び５２５によってこれを繰り返して４群の全シートを積層する。
【０１６４】
次いで、円管状に賦形された積層体は、１３０℃に加熱された加熱変形金型５０４、次いで、２０℃に冷却された冷却金型５０５の間に挟み込み、この状態で、引抜機５０６によって引き抜き、外径８０ｍｍφ、肉厚５ｍｍの円管状積層体を作製した。
【０１６５】
（実施例１０）
〔延伸ポリエチレン系樹脂シート〕
延伸ポリエチレン系樹脂シートは、実施例１と同様にして作製され、同様に表面粗面化されたものが用いられた。
【０１６６】
〔熱可塑性樹脂シート〕
熱可塑性樹脂シートは、実施例１と同様にして作製されたものが用いられた。
【０１６７】
図１５（ａ）に示すように延伸ポリエチレンシートの延伸方向が管軸に対して９０度をなすように上記延伸ポリエチレンシート２０枚と熱可塑性樹脂シート１９枚を交互に積層して実施例９と同サイズの円管状積層体を作製した。
【０１６８】
（比較例９）
実施例１０で用いた延伸ポリエチレン系樹脂シート２０枚を熱可塑性樹脂シート介在させることなく、得られた円管状積層体の管軸に平行に積層して実施例９と同サイズの円管状積層体を作製した。
【０１６９】
上記実施例９、１０及び比較例９で得られた積層体の性能を評価するため、外径８０ｍｍφ×肉厚５ｍｍ×長さ１２００ｍｍの試料を切り取り、曲げ強さ及び弾性率をＪＩＳ Ｋ ６９１１に準拠して測定した。尚、測定は支点間距離は１０００ｍｍとした。測定結果は表５に示す。
【０１７０】
【表５】

【０１７１】
（実施例１１）
〔延伸ポリエチレン系樹脂シート〕
延伸ポリエチレン系樹脂シートは、実施例１と同様にして作製され、同様に表面粗面化されたものが用いられた。
【０１７２】
〔熱可塑性樹脂シート〕
熱可塑性樹脂シートは、実施例１と同様にして作製されたものが用いられた。
【０１７３】
図１６に示される含芯材圧接引抜装置を用いて含芯材積層体が製造された。
先ず、図面左端の押出機７０１を用いて実施例１で用いた高密度ポリエチレンにより、外径７６ｍｍφ、肉厚４ｍｍの管状芯材７１３を成形し、延伸ポリエチレン系樹脂シート７２１及び熱可塑性樹脂シート７２２の繰出機７０２の中央部を貫通して図面右端の引抜機７０７によって図面右方に引き取られる。
芯材用金型７１１を出た管状芯材７１３は冷却金型７１２によって冷却され、繰出機７０２の中央部を貫通して移送される間に延伸ポリエチレン系樹脂シート７２１及び熱可塑性樹脂シート７２２の融着に支障のない程度に表面は乾燥されている。
【０１７４】
次いで、上記延伸ポリエチレンシート２０枚と熱可塑性樹脂シート１９枚を交互に積層されるように繰り出し、上記延伸ポリエチレンシート７２１及び熱可塑性樹脂シート７２２を４群に分かち、その一群を予備賦形装置７３３により緩やかにスパイラル状に巻回しながら徐々に巻回度合いを強め、巻回機７０４によって進行方向に対して６０度の角度で巻回して管状芯材７１３表面に密着させ、更に他の一群は次の予備賦形装置７３４によって進行方向に対して１２０度の角度で巻回して互いにその延伸方向が交差するように積層される。これを予備賦形装置７３５及び７３６によって繰り返して行い４群の全シートを積層する。
【０１７５】
次いで、円管状に賦形された積層体は、１３０℃に加熱された引抜金型（加熱）７０５、次いで、２０℃に冷却された冷却金型７０６の間に挟み込み、この状態で、引抜機７０７によって引き抜き、外径８０ｍｍφ、肉厚５ｍｍの図１８（ｃ）に示される円管状積層体を作製した。
【０１７６】
（実施例１２）
実施例１１の延伸ポリエチレンシート７２１と熱可塑性樹脂シート７２２の積層体を管状芯材７１３の軸線方向に延伸ポリエチレンシート７２１の延伸方向が９０度の角度をなすように隙間なく巻回して積層したこと以外、実施例１１と同様にして図１８（ｂ）に示される円管状積層体を作製した。
【０１７７】
（実施例１３）
実施例１１の延伸ポリエチレンシート７２１と熱可塑性樹脂シート７２２の積層体を芯材の軸線方向に延伸ポリエチレンシート７２１の延伸方向が平行するように隙間なく積層したこと以外、実施例１１と同様にして図１８（ａ）に示される円管状積層体を作製した。
【０１７８】
（比較例１０）
押出機７０１を除き、図１６に示される圧接引抜装置を用いて、実施例１で用いた延伸ポリエチレン系樹脂シート６０枚を円管状芯材や熱可塑性樹脂シート介在させることなく、延伸ポリエチレン系樹脂シートの延伸方向が得られた円管状積層体の管軸に平行になるように予備賦形装置７０３で円管状に賦形しながら積層し、引抜金型（加熱）において加熱挟圧し、引抜機７０７によって引き抜き、その間、冷却金型７０６にて冷却され、実施例１３と同サイズの円管状積層体を作製した。
【０１７９】
上記実施例１１〜１３及び比較例１０で得られた積層体の性能を評価するため、外径８０ｍｍφ×肉厚５ｍｍ×長さ１２００ｍｍの試料を切り取り、曲げ強さ及び弾性率をＪＩＳ Ｋ ６９１１に準拠して測定した。尚、測定は支点間距離は１０００ｍｍとした。測定結果は表６に示す。
【０１８０】
【表６】

【０１８１】
【発明の効果】
本発明の積層体の製造方法は、叙上のように構成されているので、積層時に延伸ポリオレフィン系樹脂シートの配向が緩和することなく熱可塑性樹脂シートと強固に積層され、高剛性及び高強度を有する積層体を得ることができるものである。
【０１８２】
従って、これらの積層体は、相溶性が良好な同種の熱可塑性樹脂から構成されているので、高剛性及び高強度を要求される構造部材や建築材料として好適に使用された後、耐蝕性に優れ、自然に容易に還元しないが故に、廃棄物公害の汚名を着せられていたが、これら有用プラスチックを極めて容易にリサイクルし得るものであって、環境並びに経済効果の両面から大いに貢献し得るものである。
【図面の簡単な説明】
【図１】本発明を適用した積層体の製造工程の実施例の説明図である。
【図２】図１の引抜金型の模式的断面図である。
【図３】 本発明を適用した積層体の製造工程の他の実施例の説明図である。
【図４】図３の加熱引抜金型の一例を示す模式的断面図である。
【図５】図４の加熱引抜金型への積層体の引き込み状態を模式的に示す断面図である。
【図６】図３の加熱引抜金型の他の例を示す模式的断面図である。
【図７】図３の加熱引抜金型の別の例を示す模式的断面図である。
【図８】本発明の別の実施例において共押出シートの製作に用いた押出機の説明図である。
【図９】本発明を適用した積層体の製造工程の他の実施例の説明図である。
【図１０】本発明を適用した積層体の製造工程の他の実施例の説明図である。
【図１１】図１０の引抜金型の模式的断面図及び変形の推移を併記して示す図である。
【図１２】図１０の変形金型及び冷却金型の模式的断面図である。
【図１３】本発明を適用した積層体の製造工程の他の実施例の説明図である。
【図１４】本発明を適用した積層体の製造工程の他の実施例の説明図である。
【図１５】（ａ）〜（ｈ）は、いづれも図１４又は図１５に示された実施例で得られる積層体の一部切欠斜視図である。
【図１６】本発明を適用した積層体の製造工程の他の実施例の説明図である。
【図１７】本発明を適用した積層体の製造工程の他の実施例の説明図である。
【図１８】（ａ）〜（ｈ）は、いづれも図１６又は図１７に示された実施例で得られる積層体の一部切欠斜視図である。
【符号の説明】
１、２０１、３０１、４０１、５０１、６０１、７０２、８０２：繰出機
１１、２１１、４１１、５１１、６１１、７２１、８２１：延伸ポリエチレンシート
１２、２１２、４１２、５１２、６１２、７２２、８２２：熱可塑性樹脂シート
２、２１３、３０２、４０２、５０４、６０４、７０５、８０６：引抜金型（加熱）
２１、３２１：雄型
２２、３２２：雌型
２３：油圧シリンダー
３、３０３、４０４、５０５、６０６、７０６、８０７：引抜金型（冷却）
４、２１４、３０４、４０５、５０６、６０７、７０７、８０８：引抜機
２１３：加熱引抜金型（Ｈ型）
２４０：加熱引抜金型（中空１）
２５０：加熱引抜金型（中空２）
２４１、２５１：中空状外型
２４２、２５２：コア型
Ｐ１、Ｐ２、Ｐ３：スペーサー
３１０：共押出シート
３１１：延伸共押出シート
３１２：ポリエチレンシート
３１３：熱可塑性樹脂シート
３０５、７０１、８０１：押出機
３０６、７１１、８１１：押出金型
４０３、６０５、８０５：加熱変形金型
７１２、８１２：冷却金型
５０２、５２２、５２３、５２４、５２５、６０２、６２２、６３２、７０３、７３３、７３４、７３５、７３６、８０３、８３１、８３２：予備賦形装置
５０３、６０３、７０４、８０４：巻回機
７１３、８１３：管状芯材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a laminate, and more particularly, to a method for manufacturing a laminate having high rigidity and high strength used for structural members, building materials, and the like.
[0002]
[Prior art]
Conventionally, steel materials have been mainly used for members that require high rigidity and high mechanical strength, such as structural members and building materials. In recent years, in order to reduce the weight of this type of member, a composite material obtained by reinforcing a synthetic resin with glass fiber, so-called FRP, has been used. However, the member using FRP has a problem that it is difficult to recycle because it contains glass fiber.
[0003]
On the other hand, it is known that when a crystalline thermoplastic resin is stretched at a high magnification, strength and rigidity in the stretching direction due to molecular orientation are remarkably improved, and physical properties comparable to glass fibers can be obtained. The above-mentioned resin stretched at a high magnification is usually obtained in a fibrous form. However, if such a high-magnification stretched resin can be integrated by a good bonding method, it can be used sufficiently for structural members and building materials. It is considered possible. In particular, if it is possible to obtain a molded article having a hollow cross-sectional shape typified by a tube that expresses the strength most efficiently in terms of weight, it can be developed for various applications.
[0004]
An example of this is a method in which filaments of molecularly oriented and silane-crosslinked ultra-high molecular weight polyethylene are combined with a thermoplastic resin melt in a state where the ends are constrained, and the cross-sectional shape is particularly hollow (tubular). As a method for obtaining a molded body, fiber reinforcement (molecular orientation and silane-crosslinked ultra-high molecular weight polyethylene filament) is arranged in the form of a filament, non-woven fabric, woven material, etc., and then integrated with a thermoplastic resin extruded into a tube (Japanese Patent Publication No. 7-84034).
[0005]
[Problems to be solved by the invention]
However, the above method requires a step of pre-shaping a high-magnification stretched resin and a step of integrating a thermoplastic resin extruded from an extruder separately, which is very complicated and complicated. It was a thing. Further, in the above method, the fiber reinforced resin property obtained by relaxing the molecular orientation, although the heat resistance is improved by stretching because it coalesces with the melt of the thermoplastic resin at a temperature higher than the melting point of the polyolefin. There was a problem that the strength and rigidity of the form were inevitably lowered.
[0006]
In addition, filaments and stretched films that are molecularly oriented in the stretching direction exhibit extremely high values in the stretching direction, but on the other hand, a significant decrease in strength is observed in the direction perpendicular thereto. That is, the composite reinforced with these filaments and stretched film cracks in parallel to the stretching direction of the reinforcing layer with respect to the bending force, and sufficiently exhibits the high strength inherent to the composite. In addition, when the composite is a hollow article such as a tubular body, there is a problem that the tendency is particularly prominent due to the bending force causing the fracture on the compression side.
[0007]
The present invention has been made in view of the above-mentioned fact, and as its purpose, a highly stretched polyolefin resin sheet is integrated with a thermoplastic resin sheet in a good adhesion state, and has a high rigidity and a high strength. An object of the present invention is to provide a method for producing a laminate having strength and recyclability.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, the stretched polyolefin resin sheet and a thermoplastic resin sheet having a melting temperature lower than the melting point of the stretched polyolefin resin sheet and having an adhesive property are alternately laminated, and the stretched polyolefin resin The laminate is at a temperature lower than the melting point of the resin sheet and above the melting temperature of the thermoplastic resin sheet. Passing through a mold with a certain interval The gist of the method is to produce a laminate, which is pulled out while being pressure-bonded.
[0009]
In the invention according to claim 1, pressurization to the laminate is performed by passing through a mold having a certain gap, and at least one of the mold surfaces forming the gap has a compression elastic modulus of 1000 to 10,000 kgf. / Cm ² You may employ | adopt the method of comprising with this member.
[0010]
In particular, when producing a hollow laminated body, pressurization to the laminated body is performed through a certain gap formed by a hollow mold and a core mold located inside the hollow mold, In addition, at least one of the mold surfaces forming the gap has a compression modulus of 1000 to 10000 kgf / cm. ² You may employ | adopt the method of comprising with this member.
[0011]
Furthermore, in the invention according to claim 1, a stretched polyolefin resin sheet and a thermoplastic resin sheet bonded in advance are used, and the laminated sheet of the stretched polyolefin resin sheet and the thermoplastic resin sheet is provided on both sides or one side of the polyolefin resin. You may employ | adopt the method of making it extend, after coextruding, laminating | stacking a thermoplastic resin.
[0012]
In the present invention, the melting point is a temperature T at which the crystalline structure of the crystalline thermoplastic resin completely disappears and becomes a fluid state. _m The melting temperature means the lowest temperature at which the thermoplastic resin can be plasticized to flow and be plastically processed. Specifically, the stretched thermoplastic resin has a tension for holding the stretch. Means the lowest temperature that can be melted and processed in a loaded state.
[0013]
The stretched polyolefin resin sheet used in the present invention refers to a sheet composed of a material mainly composed of a polyolefin resin stretched in at least the longitudinal direction.
[0014]
The polyolefin resin is not particularly limited. For example, low-density polyethylene, linear low-density polyethylene, high-density polyethylene, homopolypropylene, propylene random copolymer, propylene block copolymer, poly ( 4-methyl-1-pentene) and the like.
[0015]
Among these polyolefin-based resins, polyethylene having a high elastic modulus after stretching, and particularly high-density polyethylene having high crystallinity are preferably used.
[0016]
The polyolefin-based resin may be blended with a crystal nucleating agent, a crosslinking agent, a crosslinking aid, a filler, a pigment, a different type of polyolefin, a low molecular weight polyolefin wax, or the like, if necessary.
[0017]
The crystal nucleating agent is added for the purpose of improving the crystallinity, and examples thereof include calcium carbonate and titanium oxide.
[0018]
The cross-linking agent and the cross-linking aid are added for the purpose of partially cross-linking the molecular chain of the polyolefin resin and improving the heat resistance and creep performance of the stretched polyolefin resin sheet. Examples of the crosslinking agent include photopolymerization initiators such as benzophenone, thioxanthone, and acetophenone, and examples of the crosslinking assistant include polyfunctional monomers such as triallyl cyanurate, trimethylol bropan triacrylate, and diallyl phthalate.
[0019]
Instead of using the cross-linking agent, cross-linking means by electron beam irradiation or ultraviolet irradiation may be employed.
[0020]
The crosslinking means by electron beam irradiation or ultraviolet irradiation is the addition of the crosslinking agent or crosslinking aid to the polyolefin resin, preferably 1 to 20 Mrad, more preferably 3 to 10 Mrad electron beam, or preferably 50. ~ 800mW / cm ² , More preferably 100 to 500 mW / cm ² The crosslinking step is performed simultaneously with the stretching step described later or subsequent to the stretching step.
[0021]
The stretched polyolefin resin sheet is obtained by stretching a polyolefin resin sheet that has been processed into a sheet shape, but the means for producing the polyolefin resin sheet is not particularly limited. Examples thereof include extrusion molding and roll molding by a calendar method.
[0022]
The means for continuously stretching the polyolefin resin sheet is not particularly limited. For example, a method of stretching a heated polyolefin resin sheet between rolls having different speeds, and rotating in different directions. Examples include a so-called rolling method in which a heated polyolefin-based resin sheet is sandwiched between rolls to be stretched in the longitudinal direction while reducing the thickness. These methods may be performed only once in one method, but may be performed in a stepwise manner two or more times. Moreover, when implementing the said extending | stretching process 2 times or more, you may implement combining several extending | stretching methods.
[0023]
In particular, when a relatively thick polyolefin-based resin sheet is stretched, it is preferable to perform stretching after the rolling.
[0024]
The means for producing the coextruded sheet is not particularly limited, and examples thereof include extrusion molding by a T-die method. The means for continuously stretching the coextruded sheet is not particularly limited. For example, a method of stretching a heated coextruded resin sheet between rolls having different speeds, and rotating in different directions. Examples include a so-called rolling method in which a co-extruded resin sheet heated between rolls is sandwiched and elongated in the longitudinal direction while reducing the thickness. These methods may be performed only once in one method, but may be performed in a stepwise manner two or more times. Moreover, when implementing the said extending | stretching process 2 times or more, you may implement combining several extending | stretching methods.
[0025]
In particular, when a relatively thick co-extruded resin sheet is stretched, it is preferable to perform stretching after the rolling.
[0026]
The thickness of the polyolefin-based resin sheet (stretch original fabric) before stretching is determined by the use of the resulting laminate, the stretching ratio, etc., and is not particularly limited, but preferably 0.5. About 4 mm. If the thickness is less than 0.5 mm, the stretched polyolefin resin sheet becomes too thin, so that the handling property in the next step such as laminating work is reduced, and the work becomes difficult. If the thickness exceeds 4 mm, the stretching load becomes too large. The stretching apparatus is not only unnecessarily large, but the stretching work may be difficult.
[0027]
The stretched polyolefin resin sheet obtained from the stretched original fabric has a thickness of about 50 to 300 μm.
[0028]
The total thickness of the co-extruded resin sheet (stretched raw fabric) before stretching is determined by the use of the resulting laminate, the stretching ratio, and the like, and is not particularly limited. It is about 5-4 mm. If the thickness is less than 0.5 mm, the thickness of the co-extruded resin sheet becomes too thin, so that the handling property in the next step of laminating work and the like is lowered, and the work becomes difficult. If the thickness exceeds 4 mm, the stretching load becomes too large. The stretching apparatus is not only unnecessarily large, but the stretching work may be difficult.
[0029]
The thickness of the stretched coextruded resin sheet obtained from the stretched original fabric is about 50 to 300 μm.
[0030]
The stretched polyolefin-based resin sheet has a required stretch ratio determined by the properties of the crystalline polyolefin-based resin used, and is not particularly limited, but is preferably at least 10 times or more in the longitudinal direction. Preferably, it is stretched 20 times or more.
[0031]
If the stretch ratio in the longitudinal direction of the stretched polyolefin resin sheet is less than 10 times, the required strength and elastic modulus may be difficult to obtain.
[0032]
Moreover, when extending | stretching of the width direction, extending | stretching of a longitudinal direction will be suppressed and there exists a possibility that it may become difficult to extend | stretch 10 times or more in a longitudinal direction.
[0033]
The stretched polyolefin resin sheet may be subjected to a surface treatment by physical or chemical means for the purpose of improving the adhesiveness, if necessary.
[0034]
As the surface treatment, for example, a physical surface treatment method for forming fine irregularities on the surface of the obtained stretched polyolefin resin sheet by means of embossing means such as sandblasting or local heating means of the surface portion is easy work. It is preferably used for the reasons described above.
[0035]
The degree of fine irregularities formed on the surface of the stretched polyolefin resin sheet can be expressed by, for example, centerline average roughness (Ra) in accordance with JIS B 0601, and is preferably 0.5 μm or more. If Ra is less than 0.5 μm, the surface treatment effect may not be sufficiently obtained.
[0036]
The thermoplastic resin sheet alternately laminated with the stretched polyolefin resin sheet (or the thermoplastic resin sheet in the stretched coextruded resin sheet) has a melting temperature lower than the melting point of the stretched polyolefin resin sheet, and It has adhesiveness.
[0037]
Having an adhesive property with the stretched polyolefin resin sheet means that the laminate is obtained by pulling out the laminate while being pressed at a temperature lower than the melting point of the stretched polyolefin resin sheet and higher than the melting temperature of the thermoplastic resin sheet. Refers to the adhesive performance of thermoplastic resin sheets that are generally adhered without delamination between layers, and even if there are slight unadhered parts due to entrainment of air bubbles, etc. The plastic resin sheet is also included in the thermoplastic resin sheet having adhesiveness with the stretched polyolefin resin sheet. Of course, the adhesiveness is preferably as high as possible.
[0038]
The thermoplastic resin constituting the thermoplastic resin sheet is not particularly limited as long as it has adhesiveness with the stretched polyolefin resin sheet. For example, the polyolefin resin used for the stretched raw material described above Examples thereof include resins, copolymers composed of main chain olefins mainly composed of olefins and other comonomers, acid-modified polyolefins, and olefin elastomers.
[0039]
Although the thickness of the said thermoplastic resin sheet is determined by the use etc. of the laminated body obtained, and is not specifically limited, Preferably it is 100 micrometers or less, More preferably, it is 50 micrometers or less. If the thickness exceeds 100 μm, the proportion of the thermoplastic resin sheet is relatively increased, and the mechanical strength such as tensile strength and rigidity of the laminate may be lowered.
[0040]
The means for producing the thermoplastic resin sheet is not particularly limited, and examples thereof include extrusion molding by a T-die method and an inflation method.
[0041]
The thermoplastic resin sheet may be slightly stretched by the tension of the take-up roll in the T-die method, the blow-up ratio in the inflation method, or the like.
[0042]
The stretched polyolefin resin sheet and the thermoplastic resin sheet are laminated alternately. The means for laminating is not particularly limited and may be laminated one by one. However, the stretched polyolefin resin sheet and the thermoplastic resin sheet are laminated in advance, and the laminated sheet is further stretched polyolefin. The required number of sheets may be laminated so that the resin sheet and the thermoplastic resin sheet are alternately laminated.
[0043]
As a means for previously laminating the stretched polyolefin resin sheet and the thermoplastic resin sheet, for example, the surface of the stretched polyolefin resin sheet is lower than the melting point of the stretched polyolefin resin sheet and is equal to or higher than the melting temperature of the thermoplastic resin sheet. The stretched polyolefin resin sheet and the thermoplastic resin sheet are superposed on each other, drawn into a non-heated pressure contact roll, and laminated.
[0044]
In the present invention, the drawing of the laminate of the stretched polyolefin resin sheet and the thermoplastic resin sheet (or the laminate of the stretched coextruded resin sheet) while pressing and bonding is performed simultaneously with the pressure bonding of the stack. This means that a drawing means for applying a drawing force to the laminate is provided, and the drawing means suppresses the shrinkage of the stretched polyolefin resin sheet and maintains high rigidity and high strength.
[0045]
The heating means at the time of laminating the stretched polyolefin resin sheet and the thermoplastic resin sheet (or laminating the laminate of the stretched coextruded resin sheet) is by a contact-type heat source such as a heating roll heated to a predetermined temperature. It may be a non-contact heat source such as infrared heating or a hot air circulating furnace, or a combination of both.
[0046]
The heating temperature when the laminate of the stretched polyolefin resin sheet and the thermoplastic resin sheet (or the laminate of the stretched coextruded resin sheet) is integrated under pressure is lower than the melting point of the stretched polyolefin resin sheet. The melting temperature of the polyolefin resin sheet (or a laminate of the above-mentioned stretched co-extruded resin sheet) that has been stretched 20 times or more and cross-linked is the same as that of the polyolefin-based resin composition before stretching and crosslinking. Since it may be higher than the melting point of the product by 20 ° C. or more, it is necessary to pay attention to the heating temperature so that the amount of heat does not become insufficient during lamination.
[0047]
A laminate of the stretched polyolefin resin sheet and the thermoplastic resin sheet (or a laminate of the stretched coextruded resin sheet). Passing through a mold with a certain interval The means for pulling out while pressure bonding is not particularly limited. For example, in the stacking direction of the laminate of the stretched polyolefin resin sheet and the thermoplastic resin sheet (or the laminate of the stretched coextruded resin sheet). After the thickness gradually decreases from the inlet to the outlet, the upper and lower two molds having a land portion of a certain length that becomes the cross-sectional shape of the desired product, and the parallel flat mold surfaces are formed by the air cylinder or the hydraulic cylinder. Pulling dies such as two upper and lower dies that are equipped so that compressive force is applied in the stacking direction of the laminate Examples of methods used .
[0048]
Further, in the present invention, as a means for pulling out the laminate of the stretched polyolefin resin sheet and the thermoplastic resin sheet while pressure bonding, a stretched polyolefin having a volume satisfying the volume of the gap in a mold having a certain gap is used. It is formed by a method of pressurizing a laminate of a stretched polyolefin resin sheet and a thermoplastic resin sheet by drawing in and passing a laminate of a thermoplastic resin sheet and a thermoplastic resin sheet, and a hollow mold and a core mold. A method in which a laminate of a stretched polyolefin resin sheet and a thermoplastic resin sheet having a volume satisfying the volume of the gap is drawn into and passed through the gap to press the laminate of the stretched polyolefin resin sheet and the thermoplastic resin sheet, etc. Is mentioned.
[0049]
The above-described example is a particularly suitable method when the cross-section has a complex shape or a hollow shape.
[0050]
But on the other hand Mold material When the gap is formed only with a carbon steel material that is usually used, the dependency of the volume of the stretched polyolefin resin sheet and the thermoplastic resin sheet supplied to the lamination pressure is large, and if the supply volume is small, the laminate The pressurization of the resin is insufficient, and it becomes difficult to crush bubbles between layers of the stretched polyolefin resin sheet and the thermoplastic resin sheet and extract them out of the system. Moreover, when there is much supply volume, there exists a possibility that the pressurization to a laminated body may become excess and may damage a laminated body, such as a tear.
[0051]
Therefore, in the present invention, in such a case, the compression elastic modulus is 1000 to 10000 kgf / cm on at least one side of the mold surface forming the gap. ² These members are used. Further, among the hollow mold and the core mold located in the hollow mold, at least one surface has a compression elastic modulus of 1000 to 10000 kgf / cm. ² These members are used.
[0052]
On at least one side of the mold surface forming the gap, the compression elastic modulus is 1000 to 10,000 kgf / cm. ² By using this member, even if the supply volume is a little larger, it is possible to maintain an appropriate load pressure range.
[0053]
Compression elastic modulus 1000-10000kgf / cm ² The member may be provided on at least one side of the mold surfaces forming the gap, and may be provided on both sides or may be used on a part of the mold surface.
[0054]
Compression elastic modulus 1000-10000kgf / cm ² The member is not particularly limited as long as it does not cause deterioration or damage due to heat applied in the production method of the present invention, but is made of thermoplastic resin, thermosetting resin, rubber The thing made from can be used. Moreover, you may use what strengthened these resin with the fibrous and particulate reinforcement material. In addition, the compression modulus is 3000 to 8000 kgf / cm ² Is a more preferable range, and in consideration of machinability when processing as a mold and heat resistance at the operating temperature, fluorides such as polytetrafluoroethylene (PTFE) and perfluoroalkoxy resin (PFA) are used. A resin material and a reinforced fluororesin material reinforced with the resin material are suitable materials.
[0055]
Here, the compressive elastic modulus is 10,000 kgf / cm. ² When the above members are used, the dependency on the volume of the supplied laminate is large, and the stretched polyolefin resin sheet is damaged when the supply volume is slightly exceeded. Also, the compressive elastic modulus is 1000 kgf / cm ² When the following members are used, there is a problem that the machinability as a mold is poor and precise machining cannot be performed, and the strength against resistance by pulling is weak and the mold is damaged.
[0056]
The pressure applied to the laminate of the stretched polyolefin resin sheet and the thermoplastic resin sheet (or the laminate of the stretched coextruded resin sheet) is the same as that of the stretched polyolefin resin sheet (or laminate of the stretched coextruded resin sheet). )), The size of the surface irregularities, and the melted resin viscosity of the thermoplastic resin sheet, etc., and are not particularly limited. 30 kgf / cm ² The range of is preferable. 0.5kgf / cm ² Is less than 30 kgf / cm, it is difficult to crush the air bubbles between the stretched polyolefin resin sheet and the thermoplastic resin sheet (or between the layers of the laminate of the stretched coextruded resin sheet). ² Exceeding this may cause damage such as tearing or breaking of the laminate.
[0057]
The pulling force of the laminate is usually 1 to 200 kgf / cm with respect to the cross section of the laminate. ² The range of is preferable. 1kgf / cm ² If the ratio is less than 1, the orientation of the stretched polyolefin resin sheet (or the laminate of the stretched coextruded resin sheet) may be relaxed, and the strength of the resulting laminate may be reduced. 200 kgf / cm ² Exceeding this may cause damage such as tearing or breaking of the laminate.
[0058]
The laminated body pulled out while being pressure-bonded is cooled and fixed in a state where the pulling-out force is applied, and commercialized.
[0059]
The invention according to claim 2 has a stretched polyolefin resin sheet and a melting temperature lower than the melting point of the stretched polyolefin resin sheet, The draw ratio is smaller than the draw ratio of the stretched polyolefin resin sheet, and it has adhesiveness with this. The stretched thermoplastic resin sheets are alternately laminated, lower than the melting point of the stretched polyolefin resin sheet, the above At a temperature equal to or higher than the melting temperature of the stretched thermoplastic resin sheet, the laminate is Passing through a mold with a certain interval The gist of the method is to produce a laminate, which is pulled out while being pressure-bonded.
[0060]
In the present invention, it is alternately laminated with stretched polyolefin resin sheets. , Having a melting temperature lower than the melting point of the stretched polyolefin resin sheet, having a draw ratio smaller than the stretch ratio of the stretched polyolefin resin sheet, and having adhesiveness with this The stretched thermoplastic resin sheet has adhesiveness with the stretched polyolefin resin sheet, and The draw ratio is smaller than the draw ratio of the stretched polyolefin resin sheet, Although it will not specifically limit if it has melting | fusing point lower than melting | fusing point of the said extending | stretching polyolefin resin sheet, For example, the draw ratio of the said extending | stretching polyolefin resin sheet is 10 times or more, Preferably it is 20 times or more When the stretching ratio is less than 10 times, it is preferably used.
[0061]
According to a third aspect of the present invention, the stretched polyolefin resin sheet and a thermoplastic resin sheet having a melting temperature lower than the melting point of the stretched polyolefin resin sheet and an adhesive property are alternately laminated, and the stretched polyolefin resin The laminated body is pressure-bonded at a temperature lower than the melting point of the thermoplastic resin sheet and higher than the melting point of the thermoplastic resin sheet, and after integral lamination, the melting point of the thermoplastic resin sheet is lower than the melting point of the stretched polyolefin resin sheet. While maintaining the above temperature, deforming the cross-sectional shape perpendicular to the longitudinal direction Passing through a mold with a certain interval The gist of the manufacturing method of the laminate is characterized by drawing.
[0062]
Here, in the stretched polyolefin resin sheet, since the molecules are oriented in the longitudinal direction and express high strength, the strength in the vertical direction is relatively lowered. For this reason, when the cross-sectional shape of the laminate is deformed, if it is bent into a shape with a corner or is suddenly deformed, a crack occurs in the longitudinal direction, which makes molding difficult. Accordingly, the deformation of the laminate is preferably a shape having R, and the deformation of the laminate is preferably R5 or more in consideration of formability.
[0063]
For the deformation of the laminate, a heating device for expressing the above conditions, for example, a heating mold, a hot air generator, an infrared heater or the like is used. Preferably, in a mold having an inclined structure in which the mold cavity is gradually deformed into a certain shape, the laminate is heated by heating to a temperature equal to or higher than the melting point of the adhesive thermoplastic resin sheet. The thermoplastic resin sheet to be deformed is melted and fluidized, and the laminate is preferably deformed by shear deformation of the thermoplastic resin sheet.
[0064]
The method for producing a laminate according to claim 4 is the method for producing a laminate according to any one of claims 1 to 3, wherein the stretching direction of the stretched polyolefin resin sheets alternately laminated with the thermoplastic resin sheet is the same. They are stacked so as to cross each other.
[0065]
In the present invention, means for laminating the stretched polyolefin resin sheets so that the stretch directions of the stretched polyolefin resin sheets intersect with each other is not particularly limited. For example, the stretch polyolefin resin sheets are supplied in the longitudinal direction using a plurality of winding machines. While making the winding angle different from each other with respect to the thermoplastic resin sheet, or knitting using a method of folding them flatly while winding them in a spiral and wrapping them using a braiding machine, etc. A method of continuously covering and laminating is exemplified.
[0066]
Also, the longitudinal direction of the thermoplastic resin sheet is supplied along the stretch direction of the stretched polyolefin resin sheet, and the stretch direction of the stretched polyolefin resin sheet is the same as the thermoplastic resin sheet supplied to the upper or lower stage. A method in which strip-like or parallelogram-shaped stretched polyolefin resin sheets having a length or height corresponding to the width of the thermoplastic resin sheet are arranged in a row and sequentially laminated so as to intersect the longitudinal direction or at an appropriate angle is adopted. May be.
[0067]
Further, a laminated body in which a thermoplastic resin sheet and a stretched polyolefin resin sheet are alternately laminated on a polyolefin resin core material is wound on a polyolefin resin core material by using a plurality of winding machines in the same manner as the above methods. Or a method in which the winding directions are mutually changed to wind and laminate them, a method of continuous lamination while knitting using a braiding machine or the like, or a drawing direction of a stretched polyolefin resin sheet in the longitudinal direction Alternatively, a method of laminating a laminated body laminated along with a strip-like or parallelogram-like laminated body intersecting with the extending direction may be employed.
[0068]
In the present invention, the longitudinal direction of the alternately laminated thermoplastic resin sheets and the stretching direction of one of the stretched polyolefin resin sheets are not necessarily limited to a method of laminating at a specific angle. It is a preferable method in that the physical properties of a laminate obtained by laminating at the same angle from the left and right with respect to the longitudinal direction are reinforced in a balanced manner.
[0069]
The number of one unit of stretched polyolefin resin sheets that are laminated in a crossing manner is not particularly limited to two, and may be three or more. Although the form of intersection of the extending directions of these stretched polyolefin resin sheets is not particularly limited, for example, the stretch direction of any one stretched polyolefin resin sheet is aligned with the longitudinal direction of the thermoplastic resin sheet. The laminated body in which the stretching directions laminated at the same angle from the left and right intersect in three directions with respect to the stretching direction of the stretched polyolefin resin sheet is reinforced in a more balanced physical property of the resulting laminate. This is the preferred method.
[0070]
According to a fifth aspect of the present invention, there is provided a laminate manufacturing method according to any one of the first to fourth aspects, wherein the stretched polyolefin resin sheet is alternately laminated with the thermoplastic resin sheet. The stretching direction between each other It is laminated so as to intersect within a range of 30 to 150 degrees.
[0071]
When the number of stretched polyolefin resin sheets of one unit laminated in a crossing manner is three or more, the intersecting angle of the stretching directions of these stretched polyolefin resin sheets refers to the maximum intersecting angle.
If these intersecting angles are less than 30 degrees, directionality may appear in the reinforcement of the resulting laminate, and the physical properties of the resulting laminate may not be reinforced in a well-balanced manner. May not be reinforced in a well-balanced manner, it is limited to the above range, and more preferably in the range of 60 to 120 degrees.
[0072]
According to a sixth aspect of the present invention, there is provided a method for producing a laminate comprising a polyolefin resin molded body as a core material, and the laminate obtained by the method for producing a laminate according to any one of claims 1 to 5 on the core material. It is characterized by being laminated at the time of molding or after molding.
[0073]
The polyolefin resin used for the core material in the present invention is not particularly limited, and examples thereof include a reethylene resin such as high density polyethylene and a propylene resin such as polypropylene.
[0074]
The shape of the core material is determined according to the use of the obtained laminate, and is not particularly limited. For example, flat plates, corrugated plates such as corrugated plates, angles, hat shapes, and U shapes Examples include molds such as molds, and tubular objects such as circular tubes and square tubes.
[0075]
The means for producing these core materials is not particularly limited. For example, the core material may be formed into a single shape by using a molding machine such as an extrusion molding machine. Or a rod-shaped material may be subjected to secondary processing using an appropriate molding machine such as a press molding machine or a processing jig.
These core materials may be laminated with a laminate obtained by the method for producing a laminate according to claims 1 to 5 after molding. For example, a core material using a crosshead extrusion molding machine may be used. These laminates may be laminated at the same time as molding.
[0076]
The method for producing a laminate of the invention according to claim 1 includes a stretched polyolefin resin sheet and a heat having adhesiveness to the melted polyolefin resin sheet and a melting temperature lower than the melting point of the stretched polyolefin resin sheet as described above. Adopting a laminate structure in which the thermoplastic resin sheets are alternately laminated, the laminate is formed at a temperature lower than the melting point of the stretched polyolefin resin sheet and above the melting temperature of the thermoplastic resin sheet. Passing through a mold with a certain interval Since it is pulled out while being pressure-bonded, it can be strongly laminated with a thermoplastic resin sheet without relaxing the orientation of the stretched polyolefin resin sheet during lamination, and a laminate having high rigidity and high strength can be obtained. It is.
[0077]
High rigidity and high strength can be further enhanced by crosslinking the stretched polyolefin resin sheet.
[0078]
Therefore, since these laminates are composed of the same type of thermoplastic resin having good compatibility, after being suitably used as a structural member or building material that requires high rigidity and high strength, it is resistant to corrosion. Because it was excellent and not easily reduced naturally, it was put on the stigma of waste pollution, but these useful plastics can be recycled very easily, and can contribute greatly from both environmental and economic effects. It is.
[0079]
In the present invention, the pressing means for the laminated body is carried out by passing through a mold having a certain gap, and at least one of the mold surfaces forming the gap has a compression modulus of 1000 to 10,000 kgf / cm. ² It is easy to adjust the pressure application necessary for lamination even if the cross-sectional shape is irregular, and the bubbles between the stretched polyolefin resin sheet and the thermoplastic resin sheet are crushed. A laminate having high rigidity and high strength, which can be extracted out of the system and is firmly laminated with the thermoplastic resin sheet without relaxing the orientation of the stretched polyolefin resin sheet at the time of lamination, can be obtained.
[0080]
In the present invention, the pressurizing means for the laminate is performed by passing through a certain gap constituted by the hollow mold and the core mold located in the hollow mold, and at least one of the mold surfaces forming the gap Is compression elastic modulus 1000-10000kgf / cm ² If it is made up of the members, it is easy to adjust the pressure application necessary for lamination even if it has a hollow cross-sectional shape, and crushes the bubbles between the layers of the stretched polyolefin resin sheet and the thermoplastic resin sheet. What can be extracted out of the system, and can obtain a laminate having high rigidity and high strength that is firmly laminated with a thermoplastic resin sheet without relaxing the orientation of the stretched polyolefin resin sheet during lamination. It is.
[0081]
In the present invention, a stretched polyolefin resin sheet and a thermoplastic resin sheet bonded in advance are used, and the laminated sheet of the stretched polyolefin resin sheet and the thermoplastic resin sheet is obtained by laminating a thermoplastic resin on both surfaces or one surface of the polyolefin resin. If the method of stretching after coextrusion is adopted, the layer of the thermoplastic resin sheet, which is the adhesive layer between the stretched coextruded resin sheets, can be made extremely thin, so that stretching with high strength and high rigidity The volume fraction of the polyolefin resin sheet can be increased, and as a result, a laminate having high rigidity and high strength can be obtained.
[0082]
The method for producing a laminate of the invention according to claim 2 has, as described above, a stretched polyolefin resin sheet and a melting temperature lower than the melting point of the stretched polyolefin resin sheet, The draw ratio is smaller than the draw ratio of the stretched polyolefin resin sheet, and it has adhesiveness with this. Adopting a laminate structure in which stretched thermoplastic resin sheets are alternately laminated, the laminate is formed at a temperature lower than the melting point of the stretched polyolefin resin sheet and above the melting temperature of the thermoplastic resin sheet. Passing through a mold with a certain interval Since it is pulled out while being pressure-bonded, it can be strongly laminated with a thermoplastic resin sheet without relaxing the orientation of the stretched polyolefin resin sheet during lamination, and a laminate having high rigidity and high strength can be obtained. It is.
[0083]
High rigidity and high strength can be further enhanced by crosslinking the stretched polyolefin resin sheet.
[0084]
Therefore, since these laminates are composed of the same type of thermoplastic resin having good compatibility, after being suitably used as a structural member or building material that requires high rigidity and high strength, it is resistant to corrosion. Because it is excellent and does not easily reduce naturally, it was put on the stigma of waste pollution, but it can recycle these useful plastics very easily, and can contribute greatly from both environmental and economic effects. It is.
[0085]
The method for producing a laminate of the invention according to claim 3 is, as described above, a stretched polyolefin resin sheet, and a heat having an adhesive property with the melt temperature lower than the melting point of the stretched polyolefin resin sheet. The laminated laminates are alternately laminated, and the laminate is pressed and bonded at a temperature lower than the melting point of the stretched polyolefin resin sheet and higher than the melting point of the thermoplastic resin sheet. While deforming the cross-sectional shape perpendicular to the longitudinal direction while maintaining a temperature lower than the melting point and higher than the melting point of the thermoplastic resin sheet Passing through a mold with a certain interval Since it is drawn out, it is possible to obtain a laminate having high rigidity and high strength by being firmly laminated with the thermoplastic resin sheet without relaxing the orientation of the stretched polyolefin resin sheet during lamination.
[0086]
High rigidity and high strength can be further enhanced by crosslinking the stretched polyolefin resin sheet.
[0087]
Therefore, since these laminates are composed of the same type of thermoplastic resin having good compatibility, after being suitably used as a structural member or building material that requires high rigidity and high strength, it is resistant to corrosion. Because it is excellent and does not easily reduce naturally, it was put on the stigma of waste pollution, but it can recycle these useful plastics very easily, and can contribute greatly from both environmental and economic effects. It is.
[0088]
The method for producing a laminate of the invention according to claim 4 is laminated so that the extending directions of the stretched polyolefin resin sheets alternately laminated with the thermoplastic resin sheet intersect each other as described above. Therefore, the physical properties of the obtained laminate are substantially free of directionality and can impart high rigidity and high strength in a well-balanced manner, and can be used as structural members and building materials.
In addition, since the thermoplastic resins used can be composed of those showing good compatibility with each other, they can be recycled very easily, and can greatly contribute to both environmental and economic effects. .
[0089]
The method for producing a laminate according to claim 5 is a stretched polyolefin resin sheet laminated alternately with a thermoplastic resin sheet as described above. The stretching direction between each other Since the laminates are laminated so as to intersect within a range of 30 to 150 degrees, more preferably 60 to 120 degrees, the physical properties of the obtained laminate have substantially no directionality and a higher balance and higher rigidity and strength. It can be applied and can be used as a structural member or a building material.
In addition, since the thermoplastic resins used can be composed of those showing good compatibility with each other, they can be recycled very easily, and can greatly contribute to both environmental and economic effects. .
[0090]
The manufacturing method of the laminated body of the invention according to claim 6 is the manufacturing method of the laminated body of the invention according to any of claims 1 to 5 with the polyolefin resin molded body as a core material as described above. Since the obtained laminate is laminated at the time of molding of the core material or after molding, the physical properties of the obtained laminate are the width direction for plate-like bodies and molds, and the diameter for tubular bodies. The strength in the direction is remarkably improved, and particularly when a large bending force is applied, the strength of the inner portion bearing the compressive force that becomes the starting point of fracture is sufficiently imparted.
In addition, since the thermoplastic resins used can be composed of those showing good compatibility with each other, they can be recycled very easily, and can greatly contribute to both environmental and economic effects. .
[0091]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings, but the present invention is not limited to these examples.
[0092]
FIG. 1 is an explanatory view showing an example of an embodiment of the method for producing a laminate according to the present invention. The feeder 1 is composed of four upper and lower stages and 10 rolls in each stage. The long stretched polyolefin resin sheet 11 and the thermoplastic resin sheet 12 are wound around a rotatable core and are pivotally attached so that they can be fed out.
[0093]
These stretched polyolefin resin sheets 11 and thermoplastic resin sheets 12 are fed out so as to be alternately laminated.
Subsequently, the laminated body of the stretched polyolefin resin sheet 11 and the thermoplastic resin sheet 12 laminated alternately is heated to a temperature lower than the melting point of the stretched polyolefin resin sheet 11 and higher than the melting temperature of the thermoplastic resin sheet 12. It is drawn out in a state where it is pressure-bonded with the existing drawing die (heating) 2 and cooled with the drawing die (cooling) 3 to produce a laminate.
Incidentally, the compressive force in the thickness direction of the laminate is compressed / relaxed by a mold clamping hydraulic cylinder 23 or the like as shown in FIG. The drawing force loaded by the male mold 21 and the female mold 22 and loaded in a compressed state of the laminated body is given by the drawing machine 4 behind the drawing molds 2 and 3.
[0094]
FIG. 3 is an explanatory view showing another example of the method for manufacturing a laminate according to the present invention, and a manufacturing apparatus including a feeding machine 201, a heating drawing die (H type) 213 and a drawing machine 214 is used. The feeding machine 201 has a roll stand of 20 rolls in the horizontal direction and 20 rolls in the vertical direction (the number of stages and the number of rolls in each stage can be changed as necessary), and from these, a stretched polyolefin resin Sheets 211 and thermoplastic resin sheets 212 are alternately stacked and fed out.
[0095]
Next, the laminate is drawn into a heat drawing die (H type) 213 and is pressure-bonded, and a tensile force is applied by the pulling machine 214, and the stretched polyolefin resin sheet 211 is pressed and bonded. It is pulled out while suppressing the shrinkage.
As shown in FIG. 4 as an example, the heat drawing die (H type) 213 has an H-shaped cross section of the mold cavity.
If an example of this drawing die 213 is shown, the length of two vertical parallel grooves and the length of the horizontal groove connecting these at the central part are both 125 mm, and the groove width is 1. It is dug out with a width of 8mm.
The portion P1 that is hatched in close contact with each of the H-shaped grooves is a spacer of the groove. By replacing the groove spacer P1 with a spacer having an appropriate thickness, the groove width can be increased within a certain range. It can be increased or decreased.
[0096]
According to the method for manufacturing a laminate of the present invention, a laminate having a H-shaped cross-section can be manufactured using the drawing die shown in FIG.
FIG. 5 shows a state in which the stretched polyolefin resin sheet 211 and the thermoplastic resin sheet 212 are alternately laminated and filled in the drawing die 213 shown in FIG. The black line at the center of the mold cavity does not indicate a single layer of the stretched polyolefin resin sheet 211 or the thermoplastic resin sheet 212, and these laminates are wrinkled or bent. It shows schematically a state in which it is pulled out uniformly while maintaining a flat surface without any damage.
[0097]
According to the laminate manufacturing method of the present invention, in addition to manufacturing the above H-shaped laminate, a tubular laminate is manufactured using the drawing die shown in FIG. 6, or shown in FIG. A rectangular tubular laminate can be produced by using a drawing die.
The drawing die (hollow 1) 240 shown in FIG. 6 is for manufacturing a tubular laminate, and a hollow outer die 241 in which a cylindrical body having a diameter corresponding to the outer diameter of the obtained laminate is dug out. And a core mold 242 composed of a cylindrical body having a diameter corresponding to the inner diameter of the obtained laminate, and the annular groove formed between both the hollow outer mold 241 and the core mold 242 is a mold cavity. is there.
The P2 portion that is annularly hatched on the surface layer portion of the core mold 242 is a spacer of the groove. By replacing the groove spacer P2 with an annular spacer having an appropriate thickness, the groove width can be reduced within a certain range. Can be increased or decreased.
[0098]
The drawing die (hollow 2) 250 shown in FIG. 7 is for manufacturing a rectangular tubular laminate, and has a hollow outer die 251 in which a rectangular column having a shape corresponding to the outer shape of the obtained laminate is dug out. The core mold 252 is formed of a prismatic body having a shape corresponding to the inner shape of the obtained laminate, and the groove having an annular cross section formed between both the hollow outer mold 251 and the core mold 252 is a mold mold cavity. is there.
The P3 portion of the core layer 252 which is hatched in an annular shape on the surface layer portion is a spacer of the groove, and the groove width in a certain range can be obtained by replacing the groove spacer P3 with an appropriately thick angular ring spacer. Can be increased or decreased.
[0099]
FIG. 8 is an explanatory view showing another example of the method for producing a laminate according to the present invention. FIG. 8 (a) shows a case where a crosslinking agent and a photopolymerization initiator are added to a high-density polyolefin resin. The situation of co-extrusion by a multilayer extruder for producing a three-layer laminate 310 composed of a crosslinkable high-density polyolefin resin layer 312 and a linear low-density polyethylene layer 313 laminated on both sides thereof is schematically shown. FIG. 8B schematically shows the same thing except for one surface layer composed of the linear low-density polyethylene layer 313 of the laminate.
The coextruded sheet 310 obtained by these coextrusion methods is stretched before and after the heating furnace using a stretching apparatus provided with a feeding machine and a take-up machine, and then pressed by a pressure drawing apparatus shown in FIG. It is pressure pultruded.
[0100]
In FIG. 9, stretched coextruded sheets 311 wound so as to be able to be fed are mounted on a feeder 301, and these stretched coextruded sheets 311 are stacked and fed so as to have a desired thickness.
In FIG. 9, the stretched coextruded sheets 311 are stacked by being fed from a feeder 301 composed of upper and lower six stages, each stage having eight rolls. However, the number of stages and the number of rolls can be appropriately changed as necessary. Yes, the number of laminated sheets can be controlled, but by substituting a part of these stretched co-extruded sheets 311 with the stretched polyolefin resin sheet or thermoplastic resin sheet shown in the previous embodiment, a finer stretched polyolefin It is possible to control the configuration of the resin sheet and the thermoplastic resin sheet.
[0101]
9 is the same as that of the drawing die (heating) 2, the drawing die (cooling) 3 and the drawing machine 4 shown in FIGS. 1 and 2, and the drawing die ( (Heating) 302 is a split mold comprising a male mold 321 and a female mold 322 having flat mold surfaces whose side edges slide and move in parallel, and these are opened and closed by a clamping cylinder, etc. A compression force is applied to the stretched polyolefin resin sheet and the thermoplastic resin sheet laminate sandwiched between the two molds.
These molds 321 and 322 are heated so that the stretched co-extruded sheet 311 is lower than the melting point of the high-density polyolefin resin constituting the layer structure and is equal to or higher than the melting temperature of the thermoplastic resin sheet. Heated by a heating means (not shown).
[0102]
The laminated stretched coextruded sheet 311 is pulled out by a drawing machine 304 in a state of being pressure-bonded by a drawing die (heating) 302, and further cooled in the same shape and cooled in the same shape (cooling). ) Is sandwiched between 303, cooled, and pulled out to produce a laminate.
[0103]
The feeding machine 401 and the pressure drawing apparatus shown in FIG. 10 are configured by the feeding machine 1, the drawing die (heating) 2, the drawing die (cooling) 3, and the drawing machine 4 shown in FIGS. The same. The feeding machine 401 includes upper and lower six stages and eight rolls for each stage, and the number of stages of these roll stands and the number of rolls of each stage can be appropriately changed as necessary.
The drawing mold (heating) 402 is a split mold having a flat mold surface in which both side edges slide and move in parallel, and a male mold and a fixed mold for applying a compression / relaxation force by a mold clamping hydraulic cylinder or the like. The male mold and the female mold are composed of a stretched polyolefin resin sheet 411 and a thermoplastic resin sheet 412 that are alternately laminated, and the melting temperature of the thermoplastic resin sheet is lower than the melting point of the stretched polyolefin resin. It heats by the heating means which is not illustrated so that it may heat to the above temperature. Reference numeral 405 denotes a drawing machine for pulling out the laminated body heated and pressed against the drawing die (heating) 402, and 404 denotes a drawing die (cooling). The drawing die (heating) 402 and the drawing die Between the molds (cooling) 404, a heating deformation mold 403 for shaping into a desired cross-sectional shape is provided.
[0104]
An example of the heat-deformable mold 403 schematically shows a process in which the cross-sectional shape of the mold cavity of the heat-deformable mold 403 is successively deformed in the flow direction with respect to the six cross sections of the laminate. It is explanatory drawing.
The cross-sectional shape of the mold cavity of the heat-deformable mold 403 starts with the cross-sectional shape of the flat laminate on the drawing end surface of the drawing die (heating) 402 drawn at the lower left end of FIG. 11 and is gradually changed in the flow direction. 11, and the shape of the mold cavity at the exit of the heat-deformable mold 403 is finally the same as the cross-sectional shape of the desired laminate depicted at the bottom right of FIG. It has become. In FIG. 12, the cross-sectional shape of the mold cavity of the heat-deformable mold 403 is taken out and shown for two characteristic cross sections leading to the final stage. As shown in the figure, the laminate that is heat-deformed has a large curved structure so that no tensile force is applied to the tip of the part that is largely bent, and most of the compressive force or tensile force during heat deformation is heat-deformed. In order to obtain a laminate having a uniform strength, it is preferable to design a mold so that it is loaded on the flat plate portion of the laminate.
[0105]
FIG. 13 is an explanatory view showing another example of the method for manufacturing a laminate according to the present invention. The feeding machine 501 and the pressure drawing apparatus are the same as the feeding machine 1 and the drawing die (heating) shown in FIG. 2. The configuration consisting of the drawing die (cooling) 3 and the drawing machine 4 is basically the same.
[0106]
In this embodiment, the stretched polyolefin resin sheet 511 and the thermoplastic resin sheet 512 fed from the feeding machine 501 are stretched polyolefin resin sheet 511 before being heated and pressurized by a drawing die (heating) 504. And the laminated body of the thermoplastic resin sheet 512 is shaped into a tubular shape by the pre-shaping device 502 and the winding machine 503 that gradually reduce the curved diameter in a spiral shape while greatly curving the laminate.
Next, the laminate shaped into the tubular shape is heated and pressurized in a drawing mold (heating) 504 and pulled out. Since the drawing mold (heating) 504 heats and presses the laminated body that has already been formed into a tubular shape by the pre-shaping device 502 and the winding machine 503, it can be said to be a heat deformation mold.
In this way, the laminated body formed into a tubular shape is pultruded by a drawing die (heating) 504. The subsequent steps are the same as those in the above-described embodiments.
[0107]
The pre-shaping device 502 may be configured to supply a stretched polyolefin resin sheet 511 and a thermoplastic resin sheet 512 or a grouped laminate from a plurality of positions by changing the winding angle. In FIG. 13, four pre-shaping devices 522, 523, 524 and 525 are provided.
Moreover, although the winding machine 503 may cover the plurality of preliminary shaping apparatuses 502 with one unit, two or more units may be used depending on the operating state of the preliminary shaping apparatus.
[0108]
The drawing mold (heating) 504 is manufactured in accordance with the shape of the molded body to be obtained, but is a two-part mold, and is shown above in that it is a drawing mold in which the cross-sectional area decreases in the drawing direction. The pulling mold used in each embodiment is common, and the pressure at the time of opening / closing and reducing the sectional area of these pulling molds is opened / closed or loaded by a clamping hydraulic cylinder or the like.
In the drawing mold (heating) 504, the stretched polyolefin resin sheet 511 and the thermoplastic resin sheet 512 laminated alternately are heated to a temperature lower than the melting point of the stretched polyolefin resin and higher than the melting temperature of the thermoplastic resin sheet. As shown, the heating means (not shown) heats. The laminated body heated and compressed by the drawing die (heating) 504 is drawn by the drawing force of the drawing machine 506, and is cooled by the drawing die (cooling) 505 in the meantime, and has a uniformly strengthened strength. The laminated body which has is obtained.
[0109]
FIG. 14 is an explanatory view showing another example of the method for manufacturing a laminate according to the present invention. As the pre-shaped device 502 of the embodiment shown in FIG. 13, two pairs of pre-shaped devices 622 are used. And 632, one pre-shaping device 622 is at the same angle from the opposite direction to the other pre-shaping device 632 (a direction symmetrical to the flow direction of the stacked laminates). It is wound and shaped into a tube.
The stretched polyolefin resin sheet 611 wound and shaped by the pre-shaping device 602 and the winding machine 603 and the laminated body in which these are laminated are largely bent so as not to be buckled by a sudden bending force. Similar to the embodiment shown in FIG. 13, the curve diameter is gradually reduced in a spiral shape.
[0110]
Further, the laminated body wound and shaped by the pre-shaping device 602 and the winding machine 603 is pultruded by a pultrusion die (heating) 604, and then the heating deformation die 403 shown in FIG. In the same manner as above, it is shaped by heat deformation into a desired shape by the heat deformation mold 605. In the subsequent steps, the drawing force is loaded by the drawing machine 607 in the same manner as in the previous embodiments, and the stacking in the drawing mold (heating) 604, the heat deformation mold 605 and the drawing mold (cooling) 606 is performed. The body is withdrawn and cooled to obtain a laminate having a homogeneously enhanced strength.
[0111]
FIG. 15 shows some of the laminates produced in the example shown in FIGS. 13 and 14. These are not limited to the illustrated forms, and various applications are possible. For example, FIG. 15A is a laminate in which the stretching directions of the stretched polyolefin resin sheet 511 are orthogonal to each other, (B) The stretched polyolefin resin sheet 511 is wound in the opposite direction, and is wound at a specific angle in the tube axis direction of the resulting tubular laminate, (c) the stretched polyolefin resin sheet 511 in FIG. Instead, a so-called flat yarn made of a stretched polyolefin resin sheet 511 having a narrow width is laminated in the same manner.
[0112]
In addition to these tubular laminates, a plate-like laminate shown in FIGS. 15D to 15F can also be used. FIG. 15 (d) shows a laminate of stretched polyolefin resin sheets 511 and thermoplastic resin sheets 512 laminated so as to be parallel and perpendicular to the length direction of the laminate, respectively. (E) In the length direction A thermoplastic resin sheet 512 to be supplied, which is affixed by spirally winding a stretched polyolefin resin sheet 511 at a specific angle with respect to the length direction so that the stretch directions are opposite to each other; (f) The stretched polyolefin resin sheet 511 is wound around the thermoplastic resin sheet 512 supplied in the length direction so that the stretch direction is orthogonal to the length direction, and the stretch direction of the stretched polyolefin resin sheet 511 is further increased. On the other hand, two or more stretched polyolefin resin sheets 511 are wound so that their stretching directions are reversed, or FIG. In place of the stretched polyolefin resin sheet 511 wound in such a manner that the stretching direction is orthogonal to the length direction of the thermoplastic resin sheet 512 of f), the length of the thermoplastic resin sheet 512 is Examples thereof include a ternary laminate in which a stretched polyolefin resin sheet 511 is wound so that the stretching directions are parallel.
[0113]
In addition, as described above, the deformed laminated body having the cross-sectional shape shown in FIG. 15 (g) in the process of manufacturing the plate-like laminated body of FIG. 15 (d) by adding the heat deformation mold to the production line. The plate-shaped laminate of FIG. 15 (e) may be an odd-shaped laminate having the cross-sectional shape shown in FIG. 15 (h).
[0114]
FIG. 16 is an explanatory view showing another example of the method for manufacturing a laminate according to the present invention. On the tubular core material 713 formed by the extruder 701 shown at the left end of FIG. The alternating laminate of the sheet 721 and the thermoplastic resin sheet 722 is laminated in a tubular shape by the pre-shaping device 703 and the winding machine 704 that gradually reduce the curved diameter in a spiral while largely curving.
In addition, 711 is a mold for forming the tubular core material 713 of the extruder 701, 712 is the cooling mold, and 702 is a feeding machine.
[0115]
The tubular laminate is pulled out by a drawing machine 707 while being pressure-bonded by a drawing die (heating) 705, and is cooled by a drawing die (cooling) 706 in the meantime to produce a laminate.
[0116]
FIG. 17 is an explanatory view showing another example of the method for producing a laminate of the present invention. On the plate-like core material 813 formed by the extruder 801 shown at the left end of FIG. A pre-shaping device 803 for gradually reducing the curved diameter and finally flattening while winding the alternating laminate of the resin sheet 821 and the thermoplastic resin sheet 822 in a spiral while greatly curving and the winding It is laminated in a plate shape by a rotating machine 804.
[0117]
The plate-like laminate is gradually raised from the plate-like body to the desired shape by the drawing die (heat deformation type) 805, and is guided into a shape that is largely curved in advance at the bending position as described above. However, an atypical molded body bent to a final desired cross-sectional shape is formed, and then the outlet cross-sectional shape of the drawing die (heat deformation die) 805 becomes the cross-sectional shape of the inlet, and the thickness is gradually reduced while maintaining the outer shape. A molded body formed by a drawing mold (heating) 806 in which a mold cavity is formed is pressurized, pulled out by a drawing machine 808, cooled by a drawing mold (cooling) 807, and formed into a molded body. Manufactured.
[0118]
FIG. 18 shows some of the laminates produced in the example shown in FIGS. 16 and 17. These are not limited to the exemplified forms, and various applications are possible. For example, FIG. 18A shows an outer surface of the tubular core material 813 and a stretched polyolefin resin sheet alternately with the thermoplastic resin sheet 822. 821 is laminated so that the extending direction thereof is parallel to the axis of the cylindrical core material 813. FIG. 18B shows the outer surface of the tubular core material 813 with the thermoplastic resin sheet 822 and the expanded polyolefin resin sheet 821 alternately. A laminate in which the stretching direction is parallel to the radial direction of the tubular core material 813. FIG. 18 (c) The cylindrical polyolefin resin sheet 821 and the thermoplastic resin sheet 822 are alternately formed on the outer surface of the tubular core material 813. 18 (d) and FIG. 18 (layers laminated so that the extending directions thereof are the same angle with respect to the axis of the core material 813 and the winding directions are oppositely rotated. ), And the like made by stacking similarly called flat yarn where made of stretched polyolefin resin sheets of small width in place of the stretched polyolefin resin sheet 821.
[0119]
In addition to these tubular laminates, a plate-like laminate can also be used. Further, as described above, a heat-deformable mold can be added to the production line to obtain an odd-formed laminate. it can.
[0120]
(Example 1)
[Production of stretched polyethylene resin sheet]
High-density polyethylene {melting point 135 ° C, melt index (hereinafter referred to as MI, expressed as an unnamed number) 1 g / 10 min}, supplied separately from the same direction twin-screw extruder heated to 200 ° C Each 100 parts by weight of the high-density polyethylene is uniformly mixed with 3 parts by weight of triallyl cyanurate (crosslinking aid) and benzophenone (photoinitiator), and a high-density polyethylene sheet having a thickness of 3 mm is formed by a T-die. Produced.
[0121]
The above high-density polyethylene sheet was stretched at a feeding speed of 1 m / min, a drawing speed of 30 m / min (stretching ratio of 30 times), and a heating temperature of 100 ° C. using a stretching apparatus provided with a feeding machine and a take-up machine before and after the heating furnace. The film was stretched under conditions to produce a stretched polyethylene sheet having a thickness of 0.15 mm and a width of 125 mm.
[0122]
The obtained stretched polyethylene sheet is irradiated with ultraviolet rays for 10 seconds with a high-pressure mercury lamp and subjected to a crosslinking treatment, and then, to roughen the stretched polyethylene sheet, one roll temperature is 200 ° C., and the other roll temperature is Between the first pinch roll adjusted to 50 ° C. and the second pinch roll in which only the roll temperature is reversed, the stretched polyethylene sheet surface is alternately placed on the roll surface at 200 ° C. and the roll surface at 50 ° C. The sheet was pressed so as to come into contact and passed at a line speed of 20 m / min to roughen the surface of the stretched polyethylene sheet.
As a result of measurement with a surface shape measuring instrument (trade name “Dektak 303” manufactured by Nippon Vacuum Engineering Co., Ltd.), the center line surface roughness (Ra) of the stretched polyethylene sheet was 2 μm by the above roughening treatment.
[0123]
[Production of thermoplastic resin sheet]
A linear low density polyethylene (melting point: 123 ° C., MI = 0.8) was produced by an inflation molding method to produce a thermoplastic resin sheet having adhesiveness with the stretched polyethylene sheet having a thickness of 0.03 mm.
[0124]
A laminate was produced from the stretched polyethylene sheet and the thermoplastic resin sheet using a pressure drawing apparatus shown in FIGS. 1 and 2.
[0125]
First, the 20 stretched polyethylene sheets and the 19 thermoplastic resin sheets were fed out alternately so that both the male and female molds 21 and 22 were heated to 130 ° C., and then the male Both the female molds are sandwiched between the cooling molds 3 cooled to 20 ° C., and the heating mold 2 is applied with a pressure of 10 kgf / cm 2 and the cooling mold 3 is applied with a pressure of 1 kgf / cm 2. Then, the laminate was drawn by the drawing machine 4 so that a drawing force of 100 kgf / cm 2 was applied to the laminate, and a laminate having a thickness of 3.5 mm was produced.
[0126]
(Example 2)
A laminate was produced in the same manner as in Example 1 except that the surface-roughening step of the stretched polyethylene sheet in Example 1 was omitted.
[0127]
(Comparative Example 1)
The laminate structure is the same as in Example 1, both ends in the length direction of the laminate are fixed using a sheet clamp jig, and heat and cooling are the same as in Example 1 using a press molding machine (50 tons). Under the conditions, the laminate was press-molded so that a pressure of 10 kgf / cm 2 was applied to the laminate and 1 kgf / cm 2 was applied to the laminate when it was cooled to produce a laminate having a thickness of 3.5 mm.
[0128]
In order to evaluate the performance of the laminates obtained in Examples 1 and 2 and the comparative example, a test piece having a width of 10 mm and a length of 80 mm was cut out, and the bending strength and the flexural modulus were determined in accordance with JIS K 7171. It was measured. The measurement was performed at a distance between fulcrums = 70 mm. The measurement results are shown in Table 1.
[0129]
[Table 1]

[0130]
(Example 3)
[Stretched polyethylene resin sheet]
The stretched polyethylene resin sheet was produced in the same manner as in Example 1, and the same surface roughened material was used.
[0131]
[Thermoplastic resin sheet]
A thermoplastic resin sheet produced in the same manner as in Example 1 was used.
[0132]
[Pressure pulling device]
A pressure drawing apparatus configured as shown in FIGS. 3 and 4 was used.
First, a heated drawing die 213 which is fed from a horizontal axis roll and a vertical axis roll so that the 20 stretched polyethylene sheets and 20 thermoplastic resin sheets are alternately laminated and heated to 130 ° C. is shown in FIG. In the case of the heating drawing die 213, 12 kgf / cm ² Is applied to the laminate, and in this state, 50 kgf / cm is applied to the laminate. ² The H-type laminate having a thickness of 1.8 mm was manufactured by drawing with a drawing machine 214 so as to apply a drawing force, and cooling by blowing cold air of 10 ° C. from a cold air machine with the drawing force applied.
The inner surface of the heat drawing die 213 has a compression modulus of 5000 kgf / cm. ² PTFE was used.
[0133]
(Example 4)
6 is used instead of the heat drawing die 213 of Example 2, and 15 drawn polyethylene sheets and thermoplastic resin used in Example 3 from the feeding machine shown in FIG. 3 are used. The sheet is drawn out so that 14 sheets are alternately laminated, and the sheet is rolled and drawn into a heating drawing mold 240 heated to 130 ° C. In the heating drawing mold 240, 13 kgf / cm. ² Is applied to the laminate, and in this state, 50 kgf / cm is applied to the laminate. ² A hollow laminate having a thickness of 2.7 mm was manufactured by drawing with a drawing machine 214 so as to apply a drawing force and cooling in the same manner as in Example 3.
The outer surface of the core mold 242 has a compression elastic modulus of 5000 kgf / cm. ² PTFE was used.
[0134]
(Example 5)
A square tube heat drawing die 250 having the dimensions shown in FIG. 7 is used instead of the heat drawing die 213 in Example 2, and 15 drawn polyethylene sheets and thermoplastic resin used in Example 3 from the feeding machine shown in FIG. The sheet is drawn out so that 14 sheets are alternately laminated, and the sheet is rolled and drawn into a heating drawing mold 240 heated to 130 ° C., and 13 kgf / cm in the heating drawing mold 250. ² Is applied to the laminate, and in this state, 50 kgf / cm is applied to the laminate. ² A hollow laminate having a thickness of 2.7 mm was manufactured by drawing with a drawing machine 214 so as to apply a drawing force and cooling in the same manner as in Example 3.
The outer surface of the core mold 242 has a compression elastic modulus of 5000 kgf / cm. ² PTFE was used.
[0135]
(Comparative Example 2)
On the inner surface of the mold, the compressive elastic modulus is 20000 kgf / cm. ² The same as Example 3 except that the carbon steel material was used.
[0136]
45 kgf / cm for the heat drawing die 213 ² In this state, 150 kgf / cm is applied to the laminate. ² Although an attempt was made to produce an H-type laminate having a thickness of 1.8 mm by drawing with a drawing machine 214 so that the drawing force was applied, the drawn polyethylene sheet was damaged and could not be produced.
[0137]
(Comparative Example 3)
On the outer surface of the core mold, the compression elastic modulus is 12000 kgf / cm ² The same as Example 4 except that carbon fiber reinforced PTFE was used.
[0138]
40 kgf / cm for the heat drawing mold 240 ² In this state, 140 kgf / cm is applied to the laminate. ² In order to produce a hollow laminated body having a thickness of 2.7 mm, the drawn polyethylene sheet was damaged and could not be produced.
[0139]
(Comparative Example 4)
On the outer surface of the core mold, the compression elastic modulus is 400 kgf / cm. ² Example 5 was the same as Example 5 except that ethylene propylene rubber (EPDM) was used.
[0140]
8 kgf / cm for the heat drawing die 250 ² Is applied to the laminate, and in this state, 60 kgf / cm is applied to the laminate. ² A hollow laminate having a thickness of 2.7 mm was produced by a drawing machine 214 so that the drawing force was applied, but soon after the start of production, the EPDM of the core mold was damaged and could not be produced. .
[0141]
In order to evaluate the performance of the laminates obtained in Examples 3 to 5, test pieces having a width of 10 mm and a length of 80 mm were cut out, and the bending strength and the bending elastic modulus were measured according to JIS K 7171. The measurement was performed at a distance between fulcrums = 70 mm. The measurement results are shown in Table 2.
[0142]
[Table 2]

[0143]
(Example 6)
[Production of co-extruded sheet]
Using the co-extrusion apparatus shown in FIG. 8, as a polyolefin resin and a thermoplastic resin, high-density polyethylene {melting point 135 ° C., melt index (hereinafter referred to as MI, represented by an unnamed number) 1 g / 10 minutes} Resin uniformly mixed with 3 parts by weight of triallyl cyanurate (crosslinking aid) and benzophenone (photoinitiator) for 100 parts by weight of the high-density polyethylene supplied separately is the same direction twin screw extruder 305 Further, on one side and both sides, linear low density polyethylene (melting point: 123 ° C., MI = 0.8) is formed in two layers (single side) and three layers (both sides) from the other same-direction twin screw extruder 305, respectively. Extrusion was performed at a temperature of 200 ° C., and a sheet having a thickness of 3 mm was coextruded by a T die. Here, linear low-density polyethylene was used as the thermoplastic resin because the crystal structure is close to that of high-density polyethylene, and these interfaces are likely to co-crystallize during coextrusion, and thus high strength is easily obtained. It is.
[0144]
The co-extruded sheet was subjected to a drawing apparatus provided with a feeding machine and a take-up machine before and after the heating furnace, a drawing speed of 1 m / min, a drawing speed of 30 m / min (stretching ratio of 30 times), and a heating temperature of 100 ° C. In the three-layer stretched coextruded sheet, the total thickness of the stretched coextruded sheet is 0.16 mm, the width is 125 mm, the thickness of the high density polyethylene is 0.15 mm, and the thickness of the linear low density polyethylene is 0.005 mm. In a two-layer stretched coextruded sheet, a stretched coextruded sheet having a total thickness of 0.155 mm, a high density polyethylene thickness of 0.15 mm, and a linear low density polyethylene thickness of 0.005 mm, respectively. Produced.
[0145]
A laminate of the stretched extruded sheet 311 was produced using a pressure drawing apparatus shown in FIG.
First, 20 sheets of the above-mentioned three-layer stretched coextruded sheets are laminated, and two layers of stretched coextruded sheets are fed out on both sides of the laminate so that the stretched sheets face outward. Both the molds 321 and 322 are sandwiched between a drawing mold (heating) 302 heated to 130 ° C. and then both male and female molds are cooled to a cooling mold 303 cooled to 20 ° C. (Heating) 302 is 10 kgf / cm ² 1 kgf / cm for the drawing die (cooling) 303 ² In this state, 100 kgf / cm is applied to the laminate. ² Was pulled out by a pulling machine 304 so as to apply a pulling force of 3.5 mm to produce a laminate having a thickness of 3.5 mm.
[0146]
(Example 7)
The two-layer coextruded sheet produced in Example 6 was stretched to obtain a high-density polyethylene thickness of 0.15 mm, a linear low-density polyethylene thickness of 0.05 mm, and 19 two-layer stretched coextruded sheets. A laminate having a thickness of 4 mm was repeatedly produced so that a stretched polyethylene sheet having a thickness of 0.15 mm stretched on one side was laminated.
[0147]
(Comparative Example 5)
In Example 6, the high-density polyethylene was extruded at a thickness of 3 mm using a T-die, and then stretched to produce a high-density polyethylene thickness of 0.15 mm. A linear low-density polyethylene sheet was formed to a thickness of 0 by inflation. Although it was produced at 0.005 mm, it was broken when the linear low density polyethylene sheet was formed to a thickness of 0.005 mm, and production was impossible.
[0148]
(Comparative Example 6)
In Example 6, the high-density polyethylene was extruded at a thickness of 3 mm using a T-die, and then stretched to produce a high-density polyethylene thickness of 0.15 mm. A linear low-density polyethylene sheet was formed to a thickness of 0 by inflation. After the production of .01 mm, a linear low density polyethylene sheet was laminated to the stretched high density polyethylene sheet. Sometimes it was melted and fractured, making lamination impossible.
[0149]
In order to evaluate the performance of the laminates obtained in Example 6 and Comparative Examples 5 and 6, a test piece having a width of 10 mm and a length of 80 mm was cut out, and the bending strength and the bending elastic modulus were determined in accordance with JISK 7171. It was measured. The measurement was performed at a distance between fulcrums = 70 mm.
[0150]
Moreover, in order to evaluate the adhesive manufacturing method in the interface of the laminated body obtained by the said Example 6 and the comparative examples 5 and 6, the peel test of the laminated body was done based on adhesion JISK6854T type peeling. The measurement results are also shown in Table 3.
[0151]
[Table 3]

[0152]
(Example 8)
[Stretched polyethylene resin sheet]
The stretched polyethylene resin sheet was produced in the same manner as in Example 1, and the same surface roughened material was used.
[0153]
[Thermoplastic resin sheet]
A thermoplastic resin sheet produced in the same manner as in Example 1 was used.
[0154]
A laminate of the stretched polyethylene sheet and the thermoplastic resin sheet was produced using a deformation drawing apparatus shown in FIG.
[0155]
First, the 20 stretched polyethylene sheets and the 19 thermoplastic resin sheets are alternately stacked and drawn into a drawing die (heating) 402 and a heating deformation die 403 heated to 130 ° C., then to 20 ° C. It is sandwiched between cooled cooling molds 404, and 10 kgf / cm in the drawing mold (heating) 402 ² In addition, the heat-deformable mold 403 was made to have a length of 1000 mm and the cross-section was deformed by a length of 1000 mm in the case of four 250 mm lengths.
[0156]
(Comparative Example 7)
A laminate structure similar to that of Example 8 was obtained, and after being deformed in advance to the final shape shown in FIG. 11, a laminate was produced by passing through a heating mold while maintaining the shape.
[0157]
(Comparative Example 8)
The laminate structure was the same as that of Example 8, and the heating deformation mold 403 was manufactured at a heating temperature of 100 ° C.
[0158]
In order to evaluate the performance of the laminates obtained in Example 8 and Comparative Examples 7 and 8, a test piece having a width of 10 mm and a length of 80 mm was cut out, and the bending strength and the bending elastic modulus were determined in accordance with JISK 7171. It was measured. The measurement was performed at a distance between fulcrums = 70 mm. The measurement results are shown in Table 4.
[0159]
[Table 4]

[0160]
Example 9
[Stretched polyethylene resin sheet]
The stretched polyethylene resin sheet was produced in the same manner as in Example 1, and the same surface roughened material was used.
[0161]
[Thermoplastic resin sheet]
A thermoplastic resin sheet produced in the same manner as in Example 1 was used.
[0162]
A laminate of the stretched polyethylene sheet and the thermoplastic resin sheet was prepared using a circumferentially reinforced drawing apparatus shown in FIG.
[0163]
First, the 20 stretched polyethylene sheets and 19 thermoplastic resin sheets are fed out alternately so that the stretched polyethylene sheets and the thermoplastic resin sheets are divided into 4 groups, and one group is loosened by the pre-shaping device 522. While winding in a spiral shape, the winding degree is gradually increased, wound by a winding machine 503 at an angle of 60 degrees with respect to the traveling direction and shaped into a circular tube, and the other group is the next preliminary shaping The device 532 is wound at an angle of 120 degrees with respect to the traveling direction and laminated so that the extending directions intersect each other. This is repeated by the pre-shaping devices 524 and 525 to stack all four groups of sheets.
[0164]
Next, the laminated body formed into a tubular shape is sandwiched between a heat-deformable mold 504 heated to 130 ° C. and then a cooling mold 505 cooled to 20 ° C., and in this state, by a drawing machine 506. Drawing out, a tubular laminate having an outer diameter of 80 mmφ and a thickness of 5 mm was produced.
[0165]
(Example 10)
[Stretched polyethylene resin sheet]
The stretched polyethylene resin sheet was produced in the same manner as in Example 1, and the same surface roughened material was used.
[0166]
[Thermoplastic resin sheet]
A thermoplastic resin sheet produced in the same manner as in Example 1 was used.
[0167]
As shown in FIG. 15 (a), Example 9 was prepared by alternately laminating 20 stretched polyethylene sheets and 19 thermoplastic resin sheets so that the stretched direction of the stretched polyethylene sheet was 90 degrees with respect to the tube axis. A circular tubular laminate of the same size was produced.
[0168]
(Comparative Example 9)
The 20 laminated polyethylene resin sheets used in Example 10 were laminated in parallel to the tube axis of the obtained tubular laminate without interposing a thermoplastic resin sheet, and a tubular laminate having the same size as in Example 9 Was made.
[0169]
In order to evaluate the performance of the laminates obtained in Examples 9 and 10 and Comparative Example 9, a sample having an outer diameter of 80 mmφ × thickness of 5 mm × length of 1200 mm was cut out, and the bending strength and elastic modulus were set to JIS K 6911. Measured in conformity. In the measurement, the distance between fulcrums was 1000 mm. The measurement results are shown in Table 5.
[0170]
[Table 5]

[0171]
(Example 11)
[Stretched polyethylene resin sheet]
The stretched polyethylene resin sheet was produced in the same manner as in Example 1, and the same surface roughened material was used.
[0172]
[Thermoplastic resin sheet]
A thermoplastic resin sheet produced in the same manner as in Example 1 was used.
[0173]
The cored material laminate was manufactured using the cored material pressure drawing apparatus shown in FIG.
First, a tubular core material 713 having an outer diameter of 76 mmφ and a wall thickness of 4 mm is formed from the high-density polyethylene used in Example 1 by using an extruder 701 at the left end of the drawing, and a stretched polyethylene resin sheet 721 and a thermoplastic resin sheet 722 are formed. The drawing machine 702 passes through the center of the drawing machine 702 and is drawn rightward in the drawing by a drawing machine 707 at the right end of the drawing.
The tubular core material 713 exiting the core material mold 711 is cooled by the cooling mold 712 and transferred through the central portion of the feeding machine 702, while the stretched polyethylene resin sheet 721 and the thermoplastic resin sheet 722 are formed. The surface is dried to the extent that there is no hindrance to fusion.
[0174]
Next, the 20 stretched polyethylene sheets and 19 thermoplastic resin sheets are fed out alternately so that the stretched polyethylene sheet 721 and the thermoplastic resin sheet 722 are divided into 4 groups, and the group is preliminarily shaped device 733. The winding degree is gradually increased while gradually winding in a spiral shape, and the winding machine 704 is wound at an angle of 60 degrees with respect to the traveling direction so as to be in close contact with the surface of the tubular core material 713. The preliminary shaping device 734 is wound at an angle of 120 degrees with respect to the traveling direction and laminated so that the extending directions intersect each other. This is repeated by the pre-shaping devices 735 and 736 to stack all the four groups of sheets.
[0175]
Next, the laminated body formed into a tubular shape is sandwiched between a drawing die (heating) 705 heated to 130 ° C. and then a cooling die 706 cooled to 20 ° C. In this state, the drawing machine The tubular laminated body shown in FIG. 18C having an outer diameter of 80 mmφ and a wall thickness of 5 mm was drawn out by 707.
[0176]
Example 12
The laminated body of the stretched polyethylene sheet 721 and the thermoplastic resin sheet 722 of Example 11 was wound and laminated without any gap so that the stretched direction of the stretched polyethylene sheet 721 formed an angle of 90 degrees in the axial direction of the tubular core material 713. Except for this, a circular tubular laminate shown in FIG. 18B was produced in the same manner as in Example 11.
[0177]
(Example 13)
Except that the laminate of the stretched polyethylene sheet 721 and the thermoplastic resin sheet 722 of Example 11 was laminated without a gap so that the stretched direction of the stretched polyethylene sheet 721 was parallel to the axial direction of the core material, as in Example 11. A circular tubular laminate shown in FIG. 18 (a) was produced.
[0178]
(Comparative Example 10)
Except for the extruder 701, using the pressure drawing apparatus shown in FIG. 16, the stretched polyethylene resin without interposing the 60 stretched polyethylene resin sheets used in Example 1 with a tubular core material or a thermoplastic resin sheet. The sheet is stretched in a tubular shape with a pre-shaping device 703 so that the drawing direction of the sheet is parallel to the tube axis of the obtained tubular laminate, and heated and pressed in a drawing die (heating), and a drawing machine It was pulled out by 707, and during that time, it was cooled by a cooling mold 706, and a tubular laminate having the same size as in Example 13 was produced.
[0179]
In order to evaluate the performance of the laminates obtained in Examples 11 to 13 and Comparative Example 10, a sample having an outer diameter of 80 mmφ, a thickness of 5 mm, and a length of 1200 mm was cut, and the bending strength and elastic modulus were set to JIS K 6911. Measured in conformity. In the measurement, the distance between fulcrums was 1000 mm. The measurement results are shown in Table 6.
[0180]
[Table 6]

[0181]
【The invention's effect】
Since the production method of the laminate of the present invention is configured as described above, the laminate of the stretched polyolefin resin sheet is firmly laminated without relaxation during lamination, and has high rigidity and high strength. The laminated body which has can be obtained.
[0182]
Therefore, since these laminates are composed of the same type of thermoplastic resin having good compatibility, after being suitably used as a structural member or building material that requires high rigidity and high strength, it is resistant to corrosion. Because it was excellent and not easily reduced naturally, it was put on the stigma of waste pollution, but these useful plastics can be recycled very easily, and can contribute greatly from both environmental and economic effects. It is.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an embodiment of a manufacturing process of a laminate to which the present invention is applied.
2 is a schematic cross-sectional view of the drawing die in FIG. 1. FIG.
FIG. 3 is an explanatory diagram of another embodiment of a manufacturing process of a laminate to which the present invention is applied.
4 is a schematic cross-sectional view showing an example of a heat drawing die in FIG. 3. FIG.
5 is a cross-sectional view schematically showing a state in which a laminated body is drawn into the heat drawing die of FIG. 4. FIG.
6 is a schematic cross-sectional view showing another example of the heat drawing die of FIG. 3. FIG.
7 is a schematic cross-sectional view showing another example of the heat drawing die of FIG. 3. FIG.
FIG. 8 is an explanatory view of an extruder used for producing a coextruded sheet in another embodiment of the present invention.
FIG. 9 is an explanatory view of another embodiment of a manufacturing process of a laminate to which the present invention is applied.
FIG. 10 is an explanatory diagram of another embodiment of a manufacturing process of a laminate to which the present invention is applied.
FIG. 11 is a diagram showing a schematic cross-sectional view of the drawing die of FIG. 10 and a transition of deformation.
12 is a schematic cross-sectional view of the deformation mold and the cooling mold of FIG.
FIG. 13 is an explanatory view of another embodiment of a manufacturing process of a laminate to which the present invention is applied.
FIG. 14 is an explanatory diagram of another embodiment of a manufacturing process of a laminate to which the present invention is applied.
15 (a) to 15 (h) are partially cutaway perspective views of a laminate obtained in the embodiment shown in FIG. 14 or FIG.
FIG. 16 is an explanatory diagram of another embodiment of a manufacturing process of a laminate to which the present invention is applied.
FIG. 17 is an explanatory diagram of another embodiment of a manufacturing process of a laminated body to which the present invention is applied.
18 (a) to 18 (h) are partially cutaway perspective views of a laminate obtained in the embodiment shown in FIG. 16 or FIG.
[Explanation of symbols]
1, 201, 301, 401, 501, 601, 702, 802: feeding machine
11, 211, 411, 511, 611, 721, 821: stretched polyethylene sheet
12, 212, 412, 512, 612, 722, 822: thermoplastic resin sheet
2, 213, 302, 402, 504, 604, 705, 806: Drawing mold (heating)
21, 321: Male
22, 322: Female type
23: Hydraulic cylinder
3, 303, 404, 505, 606, 706, 807: Drawing mold (cooling)
4, 214, 304, 405, 506, 607, 707, 808: drawing machine
213: Heat drawing die (H type)
240: Heat drawing die (hollow 1)
250: Heat drawing die (hollow 2)
241,251: Hollow outer mold
242, 252: Core type
P1, P2, P3: Spacer
310: Coextruded sheet
311: Stretched coextrusion sheet
312: Polyethylene sheet
313: Thermoplastic resin sheet
305, 701, 801: Extruder
306, 711, 811: Extrusion mold
403, 605, 805: Heat deformation mold
712, 812: Cooling mold
502, 522, 523, 524, 525, 602, 622, 632, 703, 733, 734, 735, 736, 803, 831, 832: Pre-shaped device
503, 603, 704, 804: winding machines
713, 813: Tubular core material

Claims (6)

It has a melting temperature lower than the melting point of the stretched polyolefin resin sheet and the stretched polyolefin resin sheet, and this and the thermoplastic resin sheet having adhesiveness are alternately laminated, lower than the melting point of the stretched polyolefin resin sheet, A method for producing a laminate, wherein the laminate is pulled out while passing through a mold having a predetermined interval at a temperature equal to or higher than a melting temperature of the thermoplastic resin sheet and pressure-bonding. A stretched thermoplastic resin sheet having a melt temperature lower than the melting point of the stretched polyolefin resin sheet and the stretched polyolefin resin sheet, the stretch ratio being smaller than the stretch ratio of the stretched polyolefin resin sheet, and having an adhesive property thereto alternately laminated, below the melting point of the stretched polyolefin resin sheet, at a temperature above the melting temperature of the oriented thermoplastic resin sheet, by passing the mold and vulcanization press with fixed intervals the laminate A method for producing a laminate, wherein the laminate is pulled out while being pulled out. A stretched polyolefin resin sheet and a melting temperature lower than the melting point of the stretched polyolefin resin sheet, and an adhesive thermoplastic resin sheet are alternately laminated, at a temperature lower than the melting point of the stretched polyolefin resin sheet. In addition, the laminate is pressure-bonded at a temperature equal to or higher than the melting point of the thermoplastic resin sheet, and after the integral lamination, the longitudinal direction is maintained while maintaining a temperature lower than the melting point of the stretched polyolefin resin sheet and equal to or higher than the melting point of the thermoplastic resin sheet. A method for producing a laminate, wherein the cross-sectional shape perpendicular to the direction is deformed, and the product is pulled through a mold having a constant interval . The manufacturing method of the laminated body of Claims 1-3 laminated | stacked so that the extending | stretching direction of the extending | stretching polyolefin-type resin sheets laminated | stacked alternately with a thermoplastic resin sheet may mutually cross. The method for producing a laminate according to any one of claims 1 to 4, wherein the stretched polyolefin resin sheets alternately laminated with the thermoplastic resin sheet are laminated so that the stretching directions thereof intersect each other within a range of 30 to 150 degrees. . A laminate characterized in that a polyolefin resin molded body is used as a core material, and a laminate obtained by the method for producing a laminate according to claim 1 is laminated on the core material at the time of molding or after molding of the core material. Body manufacturing method.

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