JP2011184580A - 食品容器用シートの製造方法 - Google Patents
食品容器用シートの製造方法 Download PDFInfo
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Abstract
【解決手段】 未乾燥の回収PETフレークに鎖延長剤を添加し、該鎖延長剤が添加された回収PETフレークをベント孔が2以上ある押出機のシリンダー1に投入し、押出し温度280℃内外、背圧100〜200kg/cm2、ベント孔3、4から−750mmHg以上の高真空下で吸引・脱気しながら押出成形する。回収PETフレークの低分子量化したPETの分子鎖同志を鎖延長剤によって結びつけて高分子量化させる。水と熱によって解重合化した時に発生するエチレングリコールやアセトアルデヒドを鎖延長剤で捕捉して残留アセトアルデヒドを無くす。
【選択図】 図1
Description
また、PET樹脂を溶融・押出し成形する際に未乾燥のまま押出し成形することが知られている(例えば特許文献5、6参照。)。
請求項3に係る食品容器用シートの製造方法は、記鎖延長剤の添加が、未乾燥の回収PETフレークに流動パラフィン又はヒマシ油等を0.05〜0.20重量%まぶした後、鎖延長剤の粉沫を添加しミキサー等でミキシングして混合付着させることを特徴として構成されている。
連続押出し中のスクリュー及び真空吸引を一時停止し、主押出し機、副押出し機の第1及び第2ベント孔位置の樹脂をサンプリングし、含有水分量を測定した。水分測定はプラスチック用水分気化装置ADP−351型(京都電子工業株式会社製)及びカールフィッシャー水分計MKC−210型(京都電子工業株式会社製)を用いた。結果を表1に示す。
この食品トレーに水を200ml充填した後、PETフイルム層(12μm)/O−NYフイルム層(15μm)/イージーピール層(35μm)から成る蓋材でヒートシールにより密封した。サンプルを高さ2.0mからコンクリートの固い床に水平底部、垂直長径、垂直短径、垂直コーナー部から先に床に落下するようにして落下テストを行った。結果を表2に示す。
食品トレーを1cm×2cmの大きさに裁断して食品トレーの裁断片を作製し、そして、表裏の表面積が全体で250m2に相当する量の多数の裁断片を、500mlスリ合せ共栓付の硝子製の三角フラスコに投入した。次に、40℃の室で40℃のN2ガスで三角フラスコ中の空気を置換した(N2ガス2ml/表面積1cm2)後、共栓で密封し、40℃で24時間放置した。
このように処理した三角フラスコ中の気相を、5名の臭気パネラーで異臭の有無を判定し、また気相中のアセトアルデヒドを島津製作所株式会社製ガスクロマトグラフGC−6A型、FID検出器付で測定した。結果を表3及び表4に示す。
2:スクリュー
21:加圧圧縮部
22:シール部
3:第1ベント孔
4:第2ベント孔
Claims (5)
- 選別・粉砕・洗浄された未乾燥の回収PETフレークに鎖延長剤を添加し、該鎖延長剤が添加された回収PETフレークをベント孔が2以上ある押出機に投入し、回収PETフレークを加熱・溶融した状態でベント孔から−750mmHg以上の高真空化で吸引・脱気した後、押出成形して、回収PETフレークの低分子量化したPETの分子鎖同志を鎖延長剤によって結びつけて高分子量化させるとともに、水と熱によって解重合化した時に発生するエチレングリコールやアセトアルデヒドを鎖延長剤で捕捉して残留アセトアルデヒドをなくすことを特徴とする食品容器用シートの製造方法。
- 前記鎖延長剤が少なくとも2個以上の多官能のエポキシ基を有することを特徴とする請求項1記載の食品容器用シートの製造方法。
- 前記鎖延長剤の添加が、未乾燥の回収PETフレークに流動パラフィン又はヒマシ油等を0.05〜0.20重量%まぶした後、鎖延長剤の粉沫を添加しミキサー等でミキシングして混合付着させることを特徴とする請求項1及び2記載の食品容器用シートの製造方法。
- 前記食品容器用シートの押出し成形が共押出しTダイ法又は共押出しインフレーション法であることを特徴とする請求項1、2又は3記載の食品容器用シートの製造方法。
- 前記請求項1、2、3又は4記載の食品容器用シートの製造方法で製造される回収PETフレーク層と、バージンPET層とを共押出しし、食品が接触する内層から、バージンPET層/回収PETフレーク層の2種2層、又はバージンPET層/回収PETフレーク層/バージンPET層の2種3層に配して成ることを特徴とする食品容器用シートの製造方法。
Priority Applications (4)
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JP2010051749A JP5049365B2 (ja) | 2010-03-09 | 2010-03-09 | 食品容器用シートの製造方法 |
EP20110156947 EP2365018B1 (en) | 2010-03-09 | 2011-03-04 | Method of manufacturing sheet for food containers |
US13/042,786 US8470224B2 (en) | 2010-03-09 | 2011-03-08 | Method of manufacturing sheet for food containers |
CN201110093183.2A CN102206405B (zh) | 2010-03-09 | 2011-03-09 | 制造用于食品容器的板材的方法 |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013088728A1 (ja) * | 2011-12-16 | 2013-06-20 | 中本パックス株式会社 | 耐熱食品容器及びその製造方法 |
JP2014159134A (ja) * | 2013-02-20 | 2014-09-04 | Nakamoto Pakkusu Kk | 耐熱食品容器及びその製造方法 |
JP2014205518A (ja) * | 2013-04-16 | 2014-10-30 | 中本パックス株式会社 | 断熱食品容器及びその製造方法 |
JP2016011337A (ja) * | 2014-06-27 | 2016-01-21 | 三菱瓦斯化学株式会社 | ポリエステル再生品の製造方法 |
JP2016022957A (ja) * | 2014-07-16 | 2016-02-08 | 中本パックス株式会社 | フライ食品用袋 |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US8470224B2 (en) | 2013-06-25 |
US20110221097A1 (en) | 2011-09-15 |
CN102206405A (zh) | 2011-10-05 |
EP2365018B1 (en) | 2014-01-15 |
EP2365018A1 (en) | 2011-09-14 |
CN102206405B (zh) | 2015-06-10 |
JP5049365B2 (ja) | 2012-10-17 |
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