JP2002255231A - ガスバリヤ性、耐熱性に優れた合成樹脂製容器およびその製造方法 - Google Patents

ガスバリヤ性、耐熱性に優れた合成樹脂製容器およびその製造方法

Info

Publication number
JP2002255231A
JP2002255231A JP2001047753A JP2001047753A JP2002255231A JP 2002255231 A JP2002255231 A JP 2002255231A JP 2001047753 A JP2001047753 A JP 2001047753A JP 2001047753 A JP2001047753 A JP 2001047753A JP 2002255231 A JP2002255231 A JP 2002255231A
Authority
JP
Japan
Prior art keywords
gas barrier
synthetic resin
container
resin
barrier properties
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001047753A
Other languages
English (en)
Inventor
Sunao Asai
直 浅井
Masato Suzuki
正人 鈴木
Daisuke Uesugi
大輔 上杉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yoshino Kogyosho Co Ltd
Original Assignee
Yoshino Kogyosho Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yoshino Kogyosho Co Ltd filed Critical Yoshino Kogyosho Co Ltd
Priority to JP2001047753A priority Critical patent/JP2002255231A/ja
Priority to CNB028290860A priority patent/CN100346958C/zh
Priority to AU2002311237A priority patent/AU2002311237B2/en
Priority to DE60232199T priority patent/DE60232199D1/de
Priority to PCT/JP2002/005561 priority patent/WO2003103928A1/ja
Priority to US10/516,073 priority patent/US20060110555A1/en
Priority to EP02736011A priority patent/EP1510324B1/en
Priority to CA 2488191 priority patent/CA2488191C/en
Publication of JP2002255231A publication Critical patent/JP2002255231A/ja
Pending legal-status Critical Current

Links

Classifications

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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6418—Heating of preforms
    • B29C49/642—Heating of preforms and shrinking of the preform
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/18—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using several blowing steps
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
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Abstract

(57)【要約】 【課題】 耐熱性に優れ、ガスバリヤ性の高い合成樹脂
製の容器とその製法を提案する。 【解決手段】 母相にガスバリヤ材をブレンドしてなる
合成樹脂製の容器を、加熱処理工程を挟む少なくとも２
回の２軸延伸ブロー成形工程を経て作製されたものにて
構成する。

Description

【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、容器を透過する酸
素や炭酸ガス等に起因した内容物の品質劣化を抑制する
とともに、それ自身の耐熱性を高めた合成樹脂製容器お
よびその製造方法に関するものである。
【０００２】
【従来の技術】ペットボトルに代表されるような合成樹
脂製の容器は、軽量で取り扱いが容易であること、ま
た、透明性を確保できガラス製の容器に比較して遜色の
ない外観を呈すること、しかも、コスト的にも安価であ
ることから、近年、食品や飲料、化粧料あるいは薬剤等
を収納する容器として多用されている。
【０００３】ところで、合成樹脂製の容器は、容器本体
を通して酸素や炭酸ガスが透過するのが避けられないた
め、内容物の品質を保持できる期間、いわゆる、シェル
フライフがガラス製の容器に比較した場合に短い欠点が
ある。
【０００４】また、この種の容器は、熱に対する強度も
小さく、ポリエチレンテレフタレート樹脂（ＰＥＴ）か
らなる容器では、８５〜８７℃程度が限界であって、と
くに、内容物としてかかる温度を超えるようなものを充
てんする場合においては熱収縮による形状変形が避け難
く、用途範囲を拡大するにも限界がある。
【０００５】
【発明が解決しようとする課題】本発明の課題は、合成
樹脂製の容器における上述のような従来の問題を解消で
きる新規な容器とその製造方法を提案するところにあ
る。
【０００６】
【課題を解決するための手段】本発明は、母相にガスバ
リヤ材をブレンドしてなる合成樹脂製の容器であって、
前記容器は、加熱処理工程を挟む少なくとも２回の２軸
延伸ブロー成形工程を経て作製されたものである、こと
を特徴とするガスバリヤ性、耐熱性に優れた合成樹脂性
容器である。
【０００７】上記の構成になる容器において、母相はポ
リエチレンテレフタレート樹脂とし、ガスバリヤ材はメ
タキシリレン基含有ポリアミド樹脂、非晶質ポリエステ
ル樹脂もしくはエチレンナフタレート−エチレンテレフ
タレート共重合樹脂のうちの何れか１つとするのが望ま
しい。
【０００８】また、本発明は、母相にガスバリヤ材をブ
レンドしたベース層と、ガスバリヤ性の高い保護層を交
互に重ね合わせた多層構造よりなる合成樹脂製の容器で
あって、前記容器は、加熱処理工程を挟む少なくとも２
回の２軸延伸ブロー成形工程を経て作製されたものであ
る、ことを特徴とするガスバリヤ性、耐熱性に優れた合
成樹脂性容器であり、ここに、母相はポリエチレンテレ
フタレート樹脂とし、ガスバリヤ材はメタキシリレン基
含有ポリアミド樹脂、非晶質ポリエステル樹脂もしくは
エチレンナフタレート−エチレンテレフタレート共重合
樹脂のうちの何れか１つとするのが望ましい。
【０００９】保護層としては、メタキシリレン基含有ポ
リアミド樹脂、非晶質ポリエステル樹脂、エチレンナフ
タレート−エチレンテレフタレート共重合樹脂もしくは
エチレン−ビニルアルコール共重合樹脂のうちの何れか
１つを用いることができる。
【００１０】また、本発明は、加熱処理を挟んで２回の
２軸延伸ブロー成形を行うことにより合成樹脂製の容器
を製造するに当たり、前記ブロー成形に際して、母相に
ガスバリヤ材をブレンドした合成樹脂よりなるプリフォ
ームを用いることを特徴とするガスバリヤ性、耐熱性に
優れた合成樹脂製容器の製造方法である。
【００１１】プリフォームとしては、母相にガスバリヤ
材をブレンドしたベース層と、ガスバリヤ性の高い保護
層を交互に重ね合わせた多層構造体としたものを用いる
ことができる。
【００１２】
【発明の実施の形態】以下、図面を参照して本発明をよ
り具体的に説明する。図１は本発明に従う合成樹脂製の
５００ｍｌ耐熱・耐圧容器の外観を模式的に示したもの
である。
【００１３】図において１は容器本体、２は容器本体１
に一体的に設けられた口部である。
【００１４】本発明においては、ポリエチレンテレフタ
レート樹脂を例えば母相１ａとした場合、この樹脂の中
にガスバリヤ材ｇをブレンドするものであって、これに
よって酸素等の透過が抑制されガスバリヤ性が改善され
る。
【００１５】かかる容器は、母相１ａに対してガスバリ
ヤ材ｇをブレンドして射出成形や押出し成形等を経て得
られた図２に示すようなプリフォームＰ（口元を結晶化
（白化）したもの）を用い、これを延伸効果を発現でき
る例えば７０〜１３０℃、より好ましくは９０〜１２０
℃程度に加熱し、５０〜２３０℃、より好ましくは７０
〜１８０℃、延伸表面積倍率４〜２２倍（より好ましく
は６〜１５倍、容量で完成品よりも１．２〜２．５倍程
度のオーバーサイズ）とする条件下に１回目の２軸延伸
によるブロー成形を行い、次いで、得られたブロー成形
品に１１０〜２５５℃、より好ましくは１３０〜２００
℃のもとで、完成品より０．６０〜０．９５倍程度まで
収縮させる強制的な加熱処理を施して内部の残留応力を
除去し、さらに、６０〜１７０℃、より好ましくは８０
〜１５０℃の温度域で２回目の２軸延伸によるブロー成
形を行うことにより得ることができる。
【００１６】上記のように、加熱処理を挟む少なくとも
２回の２軸延伸ブロー成形を経て製造された容器は、そ
の本体部分における残留応力が極めて軽減され、かつ、
樹脂の密度が上昇するため、外部からの熱に対する強度
が高められる（耐熱性の改善）とともに、ガスバリヤ性
がより一層改善される。
【００１７】図３（ａ）〜（ｄ）には、１．５Ｌ耐熱容
器のプリフォームの状態から成形品に至るまでの各段階
における外観形状を模式的に示す。図中Ｐ１ は１次ブ
ロー中間体、Ｐ２ は加熱処理後の１次ブロー中間体を
示したものである。
【００１８】図４（ａ）（ｂ）は本発明に従う容器の要
部を拡大して示した他の構成例を示したものであって、
母相１ａにガスバリヤ材ｇをブレンドしたものをベース
層ｂ １ とし、ガスバリヤ性の高いものを保護層ｂ２ と
してこれらを交互に重ね合わせた多層構造（２種３層あ
るいは２種５層等）とすることができ、この場合、ガス
バリヤ性を著しく高めることができるため、シェルフラ
イフをより一層延長することが可能になる。
【００１９】上掲図４（ａ）（ｂ）に示したような多層
構造になる容器は、かかる構造を有するプリフォームを
用いることによってその成形が可能になる。本発明で
は、２種３層、２種５層を例として示したが、積層構造
についてはとくに限定されるものではなく、容器の用途
に応じて適宜に変更できる。
【００２０】母相１ａを構成する樹脂はポリエチレンテ
レフタレートの他、ポリブチレンテレフタレートやポリ
エチレンナフタレート等の飽和ポリエステル系熱可塑性
合成樹脂を使用することができる。
【００２１】かかる母相１ａにブレンドすることができ
るバリヤ材としては、メタキシリレン基含有ポリアミド
樹脂として、例えばポリメタキシリレンアジパミド樹脂
（商品名ＭＸＤ−６：三菱ガス化学）が好適であり、こ
の他に、非晶質ポリエステル樹脂、例えばテレフタル
酸、イソフタル酸、エチレングリコール、その他ジール
成分体等の共重合体やエチレンナフタレート−エチレン
テレフタレート共重合樹脂がある。
【００２２】バリヤ材の配合割合は、成形性等を考慮し
た場合０．５〜１０ｍａｓｓ％、好ましくは７ｍａｓｓ
％を上限とするのが好ましい割合であるが、国内におけ
るリサイクルの観点を考慮すると、５mass％未満とする
のが好ましい。
【００２３】保護層ｂ２ としては、メタキシリレン基
含有ポリアミド樹脂、非晶質ポリエステル樹脂、エチレ
ンナフタレート−エチレンテレフタレート共重合樹脂あ
るいはエチレン−ビニルアルコール共重合樹脂（ＥＶＯ
Ｈ）等を用いることができる。
【００２４】
【実施例】図５（ａ）〜（ｃ）に示したような耐熱角ボ
トル（３５０mｌ、５００mｌ）を作製すべく、ＰＥＴ樹
脂単体のプリフォームを用いて一回のブロー成形（シン
グルブロー）を行った場合と、ＰＥＴ樹脂にバリヤ材を
ブレンドしたプリフォームを用いて加熱処理を挟む２回
のブロー成形（ダブルブロー）を行った場合のそれぞれ
について得られた容器の酸素透過量、比率（酸素透過比
率）およびシェルフライフについて調査した。その結果
を表１および表２にそれぞれ示す。
【００２５】シングルブローの条件 金型温度（本体）：１１０℃ ブロー圧力：３．９２ＭＰａ 延伸スピード：４２cm／ｓ
【００２６】ダブルブローの条件： １回目の２軸延伸ブロー成形 金型温度（本体）：１６５℃ ブロー圧力：２．３５ＭＰａ 延伸スピード：４０cm／ｓ ２回目の２軸延伸ブロー成形 金型温度（本体）：１０４℃ ブロー圧力：３．９２ＭＰａ
【００２７】
【表１】
【００２８】
【表２】
【００２９】表１、表２より明らかなように、本発明に
従う容器においては、酸素透過量を格段に低減すること
が可能であり、シェルフライフを著しく延長できること
が確認できた。
【００３０】耐熱性については、シングルブローによる
ものでは、内容物の温度が８５〜８７℃程度で形状変形
が生じたのに対して、本発明に従う容器においては、９
０〜９３℃程度までは形状変形が生じることはなく耐熱
性に関しても著しい改善が見られた。
【００３１】
【発明の効果】本発明によれば、耐熱性は勿論のこと、
ガスバリヤ性を高めることができるので、容器の用途の
拡大を図ることができるだけでなく、内容物の品質を長
期にわたった保持できる。
【図面の簡単な説明】
【図１】 本発明に従う容器の構成図である。
【図２】 本発明に用いて好適なプリフォームを示した
図である。
【図３】 （ａ）〜（ｄ）はブロー成形の際の各プロセ
スにおける成形体の外観形状を示した図である。
【図４】 （ａ）（ｂ）は本発明に従う容器の要部を示
した図である。
【図５】 （ａ）〜（ｃ）は実施例で使用した容器の側
面、平面および底面をそれぞれ示した図である。
【符号の説明】
１ 容器本体 １ａ 母相 ２ 口部 ｇ ガスバリヤ材 ｂ１ ベース層 ｂ２ 保護層 Ｐ１ １次ブロー中間体 Ｐ２ 加熱処理後の１次ブロー中間体
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ０８Ｌ 77/00 Ｂ２９Ｋ 29:00 // Ｂ２９Ｋ 29:00 67:00 67:00 77:00 77:00 Ｂ２９Ｌ 9:00 Ｂ２９Ｌ 9:00 22:00 22:00 Ｂ６５Ｄ 1/00 Ｂ (72)発明者 上杉 大輔 千葉県松戸市稔台310 株式会社吉野工業 所千葉工場内 Ｆターム(参考） 3E033 AA01 BA14 BA17 BA18 BA21 BB08 CA07 CA16 DA03 DB01 DD05 EA01 FA03 3E086 AD04 BA04 BA15 BA33 BB03 BB05 BB41 CA11 4F208 AA19 AA24 AA24K AA26 AA29 AG03 AG07 AH55 LA03 LA04 LB01 LB22 LG06 LH06 4J002 CF042 CF061 CF071 CF081 CF082 CL032 FD202 GG01

Claims (7)

    【特許請求の範囲】
  1. 【請求項１】 母相にガスバリヤ材をブレンドしてなる
    合成樹脂製の容器であって、 前記容器は、加熱処理工程を挟む少なくとも２回の２軸
    延伸ブロー成形工程を経て作製されたものである、こと
    を特徴とするガスバリヤ性、耐熱性に優れた合成樹脂性
    容器。
  2. 【請求項２】 母相がポリエチレンテレフタレート樹脂
    であり、ガスバリヤ材がメタキシリレン基含有ポリアミ
    ド樹脂、非晶質ポリエステル樹脂もしくはエチレンナフ
    タレート−エチレンテレフタレート共重合樹脂のうちの
    何れか１つである、請求項１記載の合成樹脂製容器。
  3. 【請求項３】 母相にガスバリヤ材をブレンドしたベー
    ス層と、ガスバリヤ性の高い保護層を交互に重ね合わせ
    た多層構造よりなる合成樹脂製の容器であって、 前記容器は、加熱処理工程を挟む少なくとも２回の２軸
    延伸ブロー成形工程を経て作製されたものである、こと
    を特徴とするガスバリヤ性、耐熱性に優れた合成樹脂性
    容器。
  4. 【請求項４】 母相がポリエチレンテレフタレート樹脂
    であり、ガスバリヤ材がメタキシリレン基含有ポリアミ
    ド樹脂、非晶質ポリエステル樹脂もしくはエチレンナフ
    タレート−エチレンテレフタレート共重合樹脂のうちの
    何れか１つである、請求項３記載の合成樹脂製容器。
  5. 【請求項５】 保護層が、メタキシリレン基含有ポリア
    ミド樹脂、非晶質ポリエステル樹脂、エチレンナフタレ
    ート−エチレンテレフタレート共重合樹脂もしくはエチ
    レン−ビニルアルコール共重合樹脂のうちの何れか１つ
    よりなる、請求項３記載の合成樹脂製容器。
  6. 【請求項６】 加熱処理を挟んで２回の２軸延伸ブロー
    成形を行うことにより合成樹脂製の容器を製造するに当
    たり、 前記ブロー成形に際して、母相にガスバリヤ材をブレン
    ドした合成樹脂よりなるプリフォームを用いることを特
    徴とするガスバリヤ性、耐熱性に優れた合成樹脂製容器
    の製造方法。
  7. 【請求項７】 プリフォームが、母相にガスバリヤ材を
    ブレンドしたベース層と、ガスバリヤ性の高い保護層を
    交互に重ね合わせた多層構造体よりなる、請求項６記載
    の方法。
JP2001047753A 2001-02-23 2001-02-23 ガスバリヤ性、耐熱性に優れた合成樹脂製容器およびその製造方法 Pending JP2002255231A (ja)

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CNB028290860A CN100346958C (zh) 2001-02-23 2002-06-05 合成树脂容器及其制造方法
AU2002311237A AU2002311237B2 (en) 2001-02-23 2002-06-05 Synthetic resin container excellent in functional characteristics and production method therefor
DE60232199T DE60232199D1 (de) 2001-02-23 2002-06-05 Herstellungsverfahren für kunstharzbehälter mit hervorragenden funktionalen eigenschaften
PCT/JP2002/005561 WO2003103928A1 (ja) 2001-02-23 2002-06-05 機能的特性に優れた合成樹脂製容器およびその製造方法
US10/516,073 US20060110555A1 (en) 2001-02-23 2002-06-05 Synthetic resin container with excellent functional characteristic, and production method therefor
EP02736011A EP1510324B1 (en) 2001-02-23 2002-06-05 Production method of synthetic resin container excellent in functional characteristics
CA 2488191 CA2488191C (en) 2001-02-23 2002-06-05 Synthetic resin container and production method therefor

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PCT/JP2002/005561 WO2003103928A1 (ja) 2001-02-23 2002-06-05 機能的特性に優れた合成樹脂製容器およびその製造方法

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EP1510324A1 (en) 2005-03-02
US20060110555A1 (en) 2006-05-25
CN1628020A (zh) 2005-06-15
WO2003103928A1 (ja) 2003-12-18
EP1510324B1 (en) 2009-04-29
AU2002311237A1 (en) 2003-12-22
AU2002311237B2 (en) 2006-11-16
CN100346958C (zh) 2007-11-07

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