JP7127233B1 - 積層体及び積層体成形品の成形方法 - Google Patents
積層体及び積層体成形品の成形方法 Download PDFInfo
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- JP7127233B1 JP7127233B1 JP2022535222A JP2022535222A JP7127233B1 JP 7127233 B1 JP7127233 B1 JP 7127233B1 JP 2022535222 A JP2022535222 A JP 2022535222A JP 2022535222 A JP2022535222 A JP 2022535222A JP 7127233 B1 JP7127233 B1 JP 7127233B1
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- laminate
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- molding
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Abstract
Description
熱可塑性樹脂製の線条体からなる複数の布状体を積層してなり、該複数の布状体の少なくとも一方の面に、前記線条体と同一成分からなる厚さ0.02mm以上1.0mm以下の熱可塑性樹脂の被覆層を積層してなり、
該被覆層の150℃における貯蔵弾性率が3.00×106Pa以上1.00×108Pa以下であることを特徴とする積層体。
(請求項2)
前記布状体が同一成分からなる接着層を介して積層してなることを特徴とする請求項1記載の積層体。
(請求項3)
0.02mm以上0.1mm以下の熱可塑性樹脂からなるトップ層が、前記一方の被覆層の上面に積層してなることを特徴とする請求項1又は2記載の積層体。
(請求項4)
0.02mm以上0.1mm以下の熱可塑性樹脂からなるトップ層が、接着剤層を介して前記一方の被覆層の上面に積層してなることを特徴とする請求項1又は2記載の積層体。
(請求項5)
請求項1~4の何れかに記載の積層体を雄雌型のプレス機でプレス成形し、
次いで、前記成形により得られた成形品の成形品温度が70℃以上120℃以下の範囲で脱型し、
次いで、成形品温度を60℃以下まで冷却することを特徴とする積層体成形品の成形方法。
(請求項6)
成形品温度を60℃以下まで冷却する際に、矯正型に沿わせて形状を保持した状態で冷却することを特徴とする請求項5記載の積層体成形品の成形方法。
(請求項7)
成形品温度を60℃以下まで冷却する際に、前記雄雌型のプレス機の雄型に着けたまま冷却することを特徴とする請求項5記載の積層体成形品の成形方法。
図1は、積層された複数の布状体2の一方の面に被覆層3を積層した積層体の例を示す概略断面図であり、図2は、積層された複数の布状体2の両方の面に被覆層3、3を積層した図1の改良の一例を示す概略断面図である。
線条体1は、熱圧着の温度よりも融点の高い高融点樹脂成分を主体として構成されるが、熱圧着の温度よりも融点の低い低融点樹脂成分を含むことができる。
(1)予め基層100となるフィルムと表面層101となるフィルムを形成してドライラミネート法や熱ラミネート法を用いて複層化する手段、
(2)基層100となるフィルムの表面に表面層101となる熱可塑性樹脂をコーティングする手段、
(3)予め形成した基層100となるフィルムに表面層101を押出ラミネートする手段、あるいは
(4)多層共押出法によって積層フィルムとして押出成形する手段等から適宜選択して用いることができる。
本発明に用いられる布状体2は、線条体1を用いて織製した織布(例えば平織、綾織、朱子織、絡み織や変化組織など)が好ましいが、多数の熱可塑性樹脂からなる線条体1を直交するように並設することによって面状としてその交点を接合した交差結合布(ソフ)であってもよいし、その他上記の熱可塑性樹脂からなる線条体1で形成された編物でもよい。
図1において、被覆層3は、積層された複数の布状体2の一方の面に設けられている。また図2においては、被覆層3は、積層された複数の布状体2の両方の面に設けられている。
被覆層の貯蔵弾性率は、例えば、測定装置(EPLEXOR500N(ネッチガボ社製):動的粘弾性 温度分散測定)を用いて測定することができる。
図4及び図5に示すように、布状体2と隣接する布状体2の間には、布状体2と同一成分からなる接着層4を介して積層されていることが好ましい。布状体2と接着層4に含まれる同一成分は、ポリプロピレン樹脂成分を共通して含むことが好ましい。
言い換えれば、高融点樹脂成分は、低融点樹脂成分よりも融解ピーク温度が高い関係にある。接着層4は、これら樹脂に由来する2つの融解ピーク温度を示し得る。
(1)マレイン酸、フマル酸、メサコン酸、シトラコン酸、イタコン酸、アコニット酸、クロトン酸、コハク酸、シュウ酸、マロン酸、リンゴ酸、チオマリン酸、酒石酸、アジピン酸、クエン酸、ピメリン酸、スベリン酸、アゼライン酸、アクリル酸、テトラヒドロフタル酸、イソクロトン酸、エンドシス-ビシクロ(2.2.1)ヘプト-5-エン-2,3-ジカルボン酸及びセバシン酸等のカルボン酸;
が挙げられる。
次に、図9に基づいて、本発明に係る積層体成形品の成形方法について説明する。
プレス機8としては、雌型81と雄型82からなる雄雌型のプレス機が用いられる。
このため本発明では、図9(C)に示すように、成形品温度を60℃以下まで冷却することができる。
また別の態様として、成形品温度を60℃以下まで冷却する際に、前記雄雌型のプレス機の雄型82に着けたまま冷却することができる。
積層体の作製
(1)布状体の作製
<2種3層ポリプロピレンフィルムの製造>
高融点ポリプロピレン(MFR=0.4g/10分、重量平均分子量Mw=630,000、融点164℃)と、低融点ポリプロピレン(プロピレン-エチレンランダム共重合体、MFR=7.0g/10分、重量平均分子量Mw=220,000、融点125℃)とを用い、インフレーション成形法によって、低融点ポリプロピレンを表層とし高融点ポリプロピレンを内層とした2種3層ポリプロピレンフィルムを製造した。
得られたフィルムを、レザー(razor)でスリットした。次いで、温度110~120℃の熱板上で7倍に延伸した後、温度145℃の熱風循環式オーブン内で10%の弛緩熱処理を行い、糸巾4.5mm、繊度1700デシテックス(dt)のフラットヤーンを得た。
得られたフラットヤーンを、スルーザー織機を用いて、経糸15本/25.4mm、緯糸15本/25.4mmの綾織に織成することによって布状体を得た。
接着層としては、融点125℃の低融点ポリプロピレンに、融点161℃の高融点ポリプロピレンを含有させた、0.6mmのポリプロピレンフィルムを用いた。
被覆層は、ポリプロピレン(PP A)(プロピレン-エチレンランダム共重合体、MFR=2.0g/10分、密度=0.90g/ml)55重量%と、ポリプロピレン(PP C)(ホモポリプロピレン、MFR=0.5g/10分、密度=0.90g/ml)45重量%とをブレンドし、溶融してフィルム成形して、厚さ110μmのポリプロピレンフィルムを製造した。
<測定装置>
装置名:EPLEXOR500N(ネッチガボ社製)
測定モード:引張モード
周波数:1Hz
環境:N2下
温度範囲:-20℃~180℃
昇温速度:2℃/min
得られた布状体3枚と、得られた接着層2枚を、布状体/接着層/布状体/接着層/布状体となるように交互に積層し、その布状体の上面に、得られた被覆層を設けた。
層構成は、被覆層/布状体/接着層/布状体/接着層/布状体となるようにした。
実施例1において、被覆層のポリプロピレンフィルム(PP C)を、ポリプロピレン(PP D)(エチレン-プロピレンブロック共重合体、MFR=2.1g/10分、密度=0.90g/ml)に代える以外は実施例1と同様にして、実施例2の積層体を得た。
実施例1において、ポリプロピレン(PP A)の含有量を、70重量%に代え、実施例1で用いた被覆層のポリプロピレン(PP C)を、ポリプロピレン(PP B)(ホモポリプロピレン、MFR=2.0g/10分、密度=0.90g/ml)に代え、含有量を30重量%に代える以外は実施例1と同様にして、比較例1の積層体を得た。
実施例1において、ポリプロピレン(PP C)を、ポリプロピレン(PP B)に代え、含有量を45重量%とする以外は実施例1と同様にして、比較例2の積層体を得た。
上記のようにして得られた実施例1、実施例2、比較例1及び比較例2の積層体の外周を把持した状態で、赤外線ヒーターで、積層体表面が160℃になるまで加熱した後に、80℃に加熱された金型でプレス成形し、2分間閉型した後に、型開きし、脱型して成形品を得た。
脱型時の成形品の温度を測定し、表1に示す。
脱型時の成形品について、以下の基準で評価した。その結果を表1に示す。
〇:被覆層浮きは発生せずに表面の外観が優れた成型品を得ることができた
×:被覆層浮きが発生し、外観が歪んだ成型品になってしまっている
表1に示す実施例及び比較例の積層体を成形して得られた成形品の脱型後の写真を図10に示す。
図10において、図10(A)は比較例1の積層体を成形して得られた成形品の脱型後写真であり、図10(B)は比較例2の積層体を成形して得られた成形品の脱型後写真であり、図10(C)は実施例1の積層体を成形して得られた成形品の脱型後写真であり、図10(D)は実施例2の積層体を成形して得られた成形品の脱型後写真である。
このため、高い脱型時温度でも、表面の外観が優れた成型品を得ることができる結果、成形サイクルタイムを短縮することができることが確認できた。
実施例1、実施例2、比較例1及び比較例2の積層体から成型品を製造する成型品の製造試験において、以下の様に成型条件を変更し(変更点は以下に記した)、それ以外は同様にして、実施例3、実施例4、比較例3及び比較例4の実験を行った。
実施例1で使用した積層体を用い、積層体の外周を把持した状態で、恒温炉で、積層体表面が170℃になるまで加熱した後に、100℃に加熱された金型でプレス成形し、1.5分間閉型した後に、型開きし、脱型して成形品を得た。
実施例2で使用した積層体を用い、実施例3と同様に試験した。
比較例1で使用した積層体を用い、実施例3と同様に試験した。
比較例2で使用した積層体を用い、実施例3と同様に試験した。
比較例3及び4の場合には、比較例1及び2の場合と同様に、被覆層浮きが発生し、外観が歪んだ成型品になった。
これに対して、実施例3及び4の場合では、実施例1及び2の場合と同様に、被覆層浮きは発生せずに、表面の外観が優れた成型品を得ることができた。
このため、高い脱型時温度でも、表面の外観が優れた成型品を得ることができる結果、成形サイクルタイムを短縮することができることが確認できた。
100 基層
101 表面層
102 低融点部位
2 布状体
3 被覆層
4 接着層
5 トップ層
6 接着剤層
7 極性基含有熱可塑性樹脂層
8 プレス機
81 雄型
82 雌型
83 積層体
84 矯正型
Claims (7)
- 熱可塑性樹脂製の線条体からなる複数の布状体を積層してなり、該複数の布状体の少なくとも一方の面に、前記線条体と同一成分からなる厚さ0.02mm以上1.0mm以下の熱可塑性樹脂の被覆層を積層してなり、
該被覆層の150℃における貯蔵弾性率が3.00×106Pa以上1.00×108Pa以下であることを特徴とする積層体。 - 前記布状体が同一成分からなる接着層を介して積層してなることを特徴とする請求項1記載の積層体。
- 0.02mm以上0.1mm以下の熱可塑性樹脂からなるトップ層が、前記一方の被覆層の上面に積層してなることを特徴とする請求項1又は2記載の積層体。
- 0.02mm以上0.1mm以下の熱可塑性樹脂からなるトップ層が、接着剤層を介して前記一方の被覆層の上面に積層してなることを特徴とする請求項1又は2記載の積層体。
- 請求項1~4の何れかに記載の積層体を雄雌型のプレス機でプレス成形し、
次いで、前記成形により得られた成形品の成形品温度が70℃以上120℃以下の範囲で脱型し、
次いで、成形品温度を60℃以下まで冷却することを特徴とする積層体成形品の成形方法。 - 成形品温度を60℃以下まで冷却する際に、矯正型に沿わせて形状を保持した状態で冷却することを特徴とする請求項5記載の積層体成形品の成形方法。
- 成形品温度を60℃以下まで冷却する際に、前記雄雌型のプレス機の雄型に着けたまま冷却することを特徴とする請求項5記載の積層体成形品の成形方法。
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JP2001260290A (ja) * | 2000-03-21 | 2001-09-25 | Hagihara Industries Inc | ポリオレフィン製防音シート |
JP2001293831A (ja) * | 2000-04-12 | 2001-10-23 | Diatex Co Ltd | ラミネートシート |
JP2002067252A (ja) * | 2000-08-25 | 2002-03-05 | Hagihara Industries Inc | 積層シート |
JP2014218074A (ja) * | 2013-04-11 | 2014-11-20 | 株式会社Kosuge | 成形品の製造方法 |
JP2017196892A (ja) * | 2016-04-21 | 2017-11-02 | 萩原工業株式会社 | 成形加工用フラットヤーンラミネートシート及び成形加工品 |
WO2018143476A1 (ja) * | 2017-02-06 | 2018-08-09 | ダイヤテックス株式会社 | 積層体、積層体前駆体及び積層体の製造方法 |
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