JP4168470B2 - Pressure-resistant paper container - Google Patents
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- JP4168470B2 JP4168470B2 JP03694298A JP3694298A JP4168470B2 JP 4168470 B2 JP4168470 B2 JP 4168470B2 JP 03694298 A JP03694298 A JP 03694298A JP 3694298 A JP3694298 A JP 3694298A JP 4168470 B2 JP4168470 B2 JP 4168470B2
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Description
【０００１】
【発明の属する技術分野】
本発明は、炭酸を含む飲料などの内容物や加熱殺菌を必要とする内容物に使用したときに、容器内の内圧の増大や減少に耐え、密封性が良好な耐圧性紙容器に関するものである。
【０００２】
【従来の技術】
従来、ジュース、清涼飲料などのワンウェイ容器としては、種々の構成の容器が知られていが、一般的には、紙カップなどの紙容器が広く使用されていた。この紙容器は、内容物を充填後に、容器の開口部を蓋材で密封するものであるが、開口部に、紙素材を重ね合わせた継ぎ目部分が残っており、段差を生じているため、密封性のよいシールが困難であった。
【０００３】
そこで、蓋材のシールによる密封性を改良するために、予め成形されたプラスチックリング部材を、紙容器の開口部に、超音波などの手段によって接着した紙容器が提案され、実用化されていた。更には、内容物の浸透などを防ぐ目的で、紙容器に直接、溶融プラスチックを射出し、容器胴部の重合部に保護部を、胴部の開口部にプラスチックリング部を一体成形した紙容器が提案され、これらのプラスチックリング付き紙容器は、開口部に強度があり、蓋材とのシール部分に段差がないので、密封性の優れたシールができるばかりでなく、開封性も考慮した構成とすることもでき、液体内容物を充填するのに適した容器であった。
【０００４】
【発明が解決しようとする課題】
しかしながら、上述の従来の紙容器は、紙シート、積層フィルム、熱可塑性樹脂などの蓋材を、熱融着法によってプラスチックリング部の上面に接着させた容器であるため、容器本体に内容物を充填し、蓋材で密封した容器が、流通過程において、例えば、発泡性内容物の場合には、内圧膨張により、蓋材や容器本体が著しく変形したり、蓋材と容器本体との融着部が剥離して液漏れを発生するなどの問題点があった。
【０００５】
本発明は、上述の従来の紙容器の問題点を解決したものであり、容器内の内圧の増大や減少などの変化により、蓋材や容器本体が著しく変形したり、融着部に剥離を生じることがなく、容器の密封性が良好な耐圧性紙容器を提供するものである。
【０００６】
【課題を解決するための手段】
本発明の第１の発明は、紙を主体層とし、少なくとも容器内面側にプラスチック層を設けた胴部及び底部とからなる紙容器を、射出成形金型内に載置し、型締めした後、溶融プラスチックを射出して、胴部上端の開口部に蓋材との係合部又は係合部と熱融着部とをもつプラスチックリング部を設け、胴部の容器内面側の重合部上に柱状保護部を設け、胴部と底部との結合部上に環状保護部を設けた容器本体を、容器本体との係合部と熱融着部とをもつプラスチック製蓋材で係合と熱融着で密封した紙容器であって、前記容器本体の蓋材との係合部が、前記プラスチックリング部の内周面に設けた螺合する係合部であり、前記蓋材の容器本体との係合部が、外周縁部に立設する周壁の外周面に設けた螺合する係合部であり、前記容器本体の係合部と前記蓋材の係合部とを係合し、且つ、該係合部の係合面を熱融着して密封したことをことを特徴とする耐圧性紙容器である。
【０００７】
次に、本発明の第２の発明は、紙を主体層とし、少なくとも容器内面側にプラスチック層を設けた胴部及び底部とからなる紙容器を、射出成形金型内に載置し、型締めした後、溶融プラスチックを射出して、胴部上端の開口部に蓋材との係合部又は係合部と熱融着部とをもつプラスチックリング部を設け、胴部の容器内面側の重合部上に柱状保護部を設け、胴部と底部との結合部上に環状保護部を設けた容器本体を、容器本体との係合部と熱融着部とをもつプラスチック製蓋材で係合と熱融着で密封した紙容器であって、前記容器本体の蓋材との係合部が、前記プラスチックリング部の内周面に設けた螺合する係合部であり、前記蓋材の容器本体との係合部が、外周縁部に垂下する周壁の外周面に設けた螺合する係合部であり、前記容器本体の係合部と前記蓋材の係合部とを係合し、且つ、該係合部の係合面を熱融着して密封したことをことを特徴とする耐圧性紙容器である。
【０００８】
次に、本発明の第３の発明は、紙を主体層とし、少なくとも容器内面側にプラスチック層を設けた胴部及び底部とからなる紙容器を、射出成形金型内に載置し、型締めした後、溶融プラスチックを射出して、胴部上端の開口部に蓋材との係合部又は係合部と熱融着部とをもつプラスチックリング部を設け、胴部の容器内面側の重合部上に柱状保護部を設け、胴部と底部との結合部上に環状保護部を設けた容器本体を、容器本体との係合部と熱融着部とをもつプラスチック製蓋材で係合と熱融着で密封した紙容器であって、前記容器本体の蓋材との係合部が、前記プラスチックリング部の外周面に設けた螺合する係合部であり、前記蓋材の容器本体との係合部が、外周縁部に垂下する周壁の内周面に設けた螺合する係合部であり、前記容器本体の係合部と前記蓋材の係合部とを係合し、且つ、該係合部の係合面を熱融着して密封したことをことを特徴とする耐圧性紙容器である。
【０００９】
次に、本発明の第４の発明は、紙を主体層とし、少なくとも容器内面側にプラスチック 層を設けた胴部及び底部とからなる紙容器を、射出成形金型内に載置し、型締めした後、溶融プラスチックを射出して、胴部上端の開口部に蓋材との係合部又は係合部と熱融着部とをもつプラスチックリング部を設け、胴部の容器内面側の重合部上に柱状保護部を設け、胴部と底部との結合部上に環状保護部を設けた容器本体を、容器本体との係合部と熱融着部とをもつプラスチック製蓋材で係合と熱融着で密封した紙容器であって、前記容器本体の蓋材との係合部が、前記プラスチックリング部の外周面に設けた螺合する係合部であり、前記蓋材の容器本体との係合部が、外周縁部に垂下する周壁の内周面に設けた螺合する係合部であり、前記容器本体の係合部と前記蓋材の係合部とを係合し、且つ、前記プラスチックリング部の上端面と前記蓋材の天板下面との接合面を熱融着して密封したことをことを特徴とする耐圧性紙容器である。
【００１０】
次に、本発明の第５の発明は、紙を主体層とし、少なくとも容器内面側にプラスチック層を設けた胴部及び底部とからなる紙容器を、射出成形金型内に載置し、型締めした後、溶融プラスチックを射出して、胴部上端の開口部に蓋材との係合部又は係合部と熱融着部とをもつプラスチックリング部を設け、胴部の容器内面側の重合部上に柱状保護部を設け、胴部と底部との結合部上に環状保護部を設けた容器本体を、容器本体との係合部と熱融着部とをもつプラスチック製蓋材で係合と熱融着で密封した紙容器であって、前記容器本体の蓋材との係合部が、前記プラスチックリング部の内周面に設けた螺合する係合部であり、前記蓋材の容器本体との係合部が、外周縁部に立設する周壁の外周面に設けた螺合する係合部であり、前記容器本体の係合部と前記蓋材の係合部とを係合し、且つ、該係合部の上方の前記プラスチックリング部の内周面と前記周壁の外周面との接合面を熱融着して密封したことをことを特徴とする耐圧性紙容器である。
【００１１】
次に、本発明の第６発明は、紙を主体層とし、少なくとも容器内面側にプラスチック層 を設けた胴部及び底部とからなる紙容器を、射出成形金型内に載置し、型締めした後、溶融プラスチックを射出して、胴部上端の開口部に蓋材との係合部又は係合部と熱融着部とをもつプラスチックリング部を設け、胴部の容器内面側の重合部上に柱状保護部を設け、胴部と底部との結合部上に環状保護部を設けた容器本体を、容器本体との係合部と熱融着部とをもつプラスチック製蓋材で係合と熱融着で密封した紙容器であって、前記容器本体の蓋材との係合部が、前記プラスチックリング部の内周面に設けた螺合する係合部であり、前記蓋材の容器本体との係合部が、外周縁部の内側に垂下する周壁の外周面に設けた螺合する係合部であり、前記容器本体の係合部と前記蓋材の係合部とを係合し、且つ、前記プラスチックリング部の上面と前記蓋材の外周縁部との接合面を熱融着して密封したことをことを特徴とする耐圧性紙容器である。
【００１２】
次に、本発明の第７発明は、前記容器本体の底部及び前記蓋材の天板の容器内面側に、格子状又は環状の補強リブを設けたことを特徴とする請求項１乃至６記載の耐圧性紙容器である。
【００１３】
次に、本発明の第８発明は、前記蓋材の天板又は前記容器本体の底部に開封可能な注出孔を設けたことを特徴とする請求項１乃至７記載の耐圧性紙容器である。
【００１４】
そして、本発明の第９発明は、前記注出孔を封止フィルムで開封可能に封止したことを特徴とする請求項８記載の耐圧性紙容器である。
【００１５】
【作用】
本発明の耐圧性紙容器は、容器本体がインサート射出成形によって、紙容器の開口部にプラスチックリング部を設け、胴部の重合部上にプラスチックの柱状保護部を設け、胴部と底部の結合部上にプラスチックの環状保護部を設けて、強度が補強されており、この容器本体の開口部のプラスチックリング部に、蓋材が咬合、螺合などの係合部と熱融着とでしっかりと装着している。このため、内容物によって容器の内圧が変動（増大又は減少）しても、容器本体と蓋材との封止状態が破損されることがなく、容器の密封性が良好である。
【００１６】
また、容器本体の底部及び蓋材の天板の容器内面側に、格子状又は環状の補強リブを設けた本発明の耐圧性紙容器は、補強リブの剛性により、容器内の内圧変動に対し、容器が変形しにくい。
【００１７】
【発明の実施の形態】
本発明の一実施形態の耐圧性紙容器は、容器本体とこの容器本体の開口部に係合と熱融着により装着する蓋材とから構成される。容器本体は、まず、紙層を主体層とし、少なくとも容器内面側にポリエチレンなどのプラスチック層を設けた、例えば、ポリエチレン層／紙層／ポリエチレン層構成、ポリエチレン層／紙層／ポリエチレン層／アルミニウム箔層／接着剤層／ポリエチレンテレフタレート層／接着剤層／ポリエチレン層構成、ポリエチレン層／紙層／エチレン−アクリル酸共重合体層／ポリエチレンテレフタレート層／酸化珪素蒸着層／接着剤層／ポリエチレン層構成などの積層材料を用いて、胴部の下方内周縁部に底部の周縁部を加熱状態で巻締めして一体化した紙容器を作製し、次に、この紙容器を射出成形金型内に載置し、型締めした後、ポリエチレンなどの溶融プラスチックを金型のキャビティ（雌型と雄型の間の空間）内に射出して、紙容器の開口部に蓋材との係合部と熱融着部をもつプラスチックリング部を、胴部の重合部上に柱状保護部を、胴部と底部の結合部上に環状保護部を形成させて作製するものである。
【００１８】
蓋材は、紙層を主体層とし、少なくとも容器内面側にポリエチレンなどのプラスチック層を設けた、例えば、ポリエチレン層／紙層／ポリエチレン層構成、ポリエチレン層／紙層／ポリエチレン層／アルミニウム箔層／接着剤層／ポリエチレンテレフタレート層／接着剤層／ポリエチレン層構成、ポリエチレン層／紙層／エチレン−アクリル酸共重合体層／ポリエチレンテレフタレート層／酸化珪素蒸着層／接着剤層／ポリエチレン層構成などの積層材料を用いて作製した板状の天板を、射出成形金型内に載置し、型締めした後、ポリエチレンなどの溶融プラスチックを金型のキャビティ内に射出して、天板の外周縁部に容器本体との係合部と熱融着部をもつ周壁を形成させた蓋材を作製するものである。
【００１９】
そして、容器本体に内容物を充填したのち、容器本体のプラスチックリングの係合部に蓋材の周壁の係合部を嵌着して蓋材を装着したのち、容器本体のプラスチックリングの熱融着部と蓋材の周壁の熱融着部とを超音波シール法などにより熱融着して、容器を封止するものである。
【００２０】
また、本発明の他の実施形態の耐圧性紙容器は、容器本体のプラスチックリング部の係合部が螺合する係合部であり、蓋材は、容器本体との螺合する係合部と熱融着部をもち、ポリエチレンなどの溶融プラスチックを射出成形して作製するものである。
【００２１】
本発明の耐圧性容器は、さらに、容器の強度を増すために、蓋材の天板の容器内面側に、格子状又は環状などの補強リブを設けても良く、また、同様に容器本体の底部の容器内面側にも格子状又は環状などの補強リブを設けても良い。この補強リブの形状は、特に限定するものではないが、断面形状が長方形、凸字状、Ｌ字状のものなどが好ましい。
【００２２】
また、内容物の注出時の使用し易さを考慮して、蓋材の天板に、開封可能な注出孔を設けても良く、また、容器本体の底部にも同様に開封可能な注出孔を設けても良い。通常では、この注出孔は、封止フィルムを容器外面側に剥離可能に貼着して封止するものである。
【００２３】
なお、この封止フィルムは、蓋材接触層に蓋材との熱融着層を有する単体又は積層フィルムを用いれば良く、バリア性を必要とする場合には、熱融着層の外側層に金属箔層、金属又は酸化珪素等の無機物を蒸着した熱可塑性樹脂フィルム又は紙よりなる層、エチレン−ビニルアルコール共重合体樹脂層、ポリアミド樹脂層、ポリ塩化ビニリデン樹脂層の少なくともいずれか一層を有する積層フィルムを用いるものである。
【００２４】
【実施例】
次に本発明の実施例を具体的に説明する。
＜実施例１＞
まず、ポリエチレン層（２０μｍ）／紙層（３２０ｇ／ｍ2 ）／ポリエチレン層（２０μｍ）／ポリエチレン層（１５μｍ）／ポリエチレンテレフタレート層（１２μｍ）／酸化珪素蒸着膜（５００Å）／ポリエチレン層（６０μｍ）構成などの積層材料を用いて、胴部の下方内周縁部に底部の周縁部を加熱状態で巻締めして一体化した紙容器を作製した。
【００２５】
次に、この紙容器を射出成形金型内に載置し、型締めした後、溶融ポリエチレンを金型のキャビティ内に射出して、図１に示すように、紙容器（１１０）の開口部に蓋材との咬合する係合部（１２２）と熱融着部（１２３）をもつプラスチックリング部（１２０）を、胴部（１１１）の重合部上に柱状保護部（１３０）を、胴部と底部（１１２）の結合部上に環状保護部（１４０）を形成させた容器本体（１００）を作製した。
【００２６】
また、これとは別個に、図１に示すように、ポリエチレン層（２０μｍ）／紙層（３２０ｇ／ｍ2 ）／ポリエチレン層（２０μｍ）／ポリエチレン層（１５μｍ）／ポリエチレンテレフタレート層（１２μｍ）／酸化珪素蒸着膜（５００Å）／ポリエチレン層（６０μｍ）構成の積層材料からなり、注出孔にアルミニウム箔層（５０μｍ）／ポリエチレンテレフタレート（１２μｍ）／積層フィルム（４５μｍ）（ポリエチレン層／ポリ塩化ビニリデン層／ポリエチレン層）構成の封止フィルム（２３０）を開封可能に熱融着した天板（２１０）を、射出成形金型内に載置し、型締めした後、溶融ポリエチレンを金型のキャビティ内に射出して、天板の外周に咬合する係合部（２２２）と熱融着部（２２３）とをもつ環状保護部（２２０）を設けた蓋材（２００）を作製した。
【００２７】
次に、充填機で炭酸飲料を容器本体に充填したのち、図２に示すように、容器本体（１００）の開口部に、蓋材（２００）を装着し、容器本体のプラスチックリング部（１２０）の係合部（１２２）と蓋材の環状保護部（２２０）の係合部（２２２）とを咬合させ、さらに超音波シール法で、容器本体のプラスチックリング部の熱融着部（１２３）と蓋材の環状保護部の熱融着部（２２３）とを熱融着して密封し、内容量２５０ｍｌの本実施例の耐圧性紙容器（１０）を作製した。
【００２８】
そして、上述の本実施例の耐圧性紙容器を、通常の流通及び保管期間を経てのち、容器の外観を観察したところ、外観性を損なうほどの著しい容器の変形は見られず、また、液漏れを発生したものは、確認されなかった。
【００２９】
＜実施例２＞
まず、実施例１と同様の紙容器を作製し、この紙容器を射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、図３に示すように、胴部（１１０）上端の開口部に蓋材との螺合する係合部（１２２）を内周面にもつプラスチックリング部（１２０）を設け、胴部の容器内面側の重合部上に柱状保護部１３０）を設け、胴部と底部との結合部上に環状保護部を設けた容器本体（１０）を、実施例１と同様にして作製した。
【００３０】
次に、これとは別個に、アルミニウム箔層（５０μｍ）／ポリエチレンテレフタレート（１２μｍ）／積層フィルム（４５μｍ）（ポリエチレン層／ポリ塩化ビニリデン層／ポリエチレン層）構成の封止フィルムを、射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、図３に示すように、封止フィルム（２３０）で外側から封止された注出孔（２１１）をもつ天板（２１０）の外周縁部に周壁（２４０）が立設し、この周壁の外周面に容器本体との螺合する係合部（２４１）をもつ蓋材（２００）を作製した。
【００３１】
そして、充填機で炭酸飲料を容器本体に充填したのち、図３に示すように、容器本体（１００）の開口部に、蓋材（２００）を装着し、容器本体のプラスチックリング部（１２０）の係合部（１２２）と蓋材の周壁（２４０）の係合部（２４１）とを螺合して係合させ、さらに超音波シール法で、その係合部の係合面を熱融着して密封し、内容量２５０ｍｌの本実施例の耐圧性紙容器（１０）を作製した。
【００３２】
＜実施例３＞
まず、実施例２と同様にして、紙容器を射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、図４に示すように、胴部（１１０）上端の開口部に蓋材との螺合する係合部（１２２）を内周面にもつプラスチックリング部（１２０）を設け、胴部の容器内面側の重合部上に柱状保護部１３０）を設け、胴部と底部との結合部上に環状保護部を設けた容器本体（１０）を作製した。
【００３３】
次に、これとは別個に、実施例２と同様にして、封止フィルムを射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、図４に示すように、封止フィルム（２３０）で外側から封止された注出孔（２１１）をもつ天板（２１０）の外周縁部に周壁（２４０）を垂下し、この周壁の外周面に容器本体との螺合する係合部（２４１）をもつ蓋材（２００）を作製した。
【００３４】
そして、充填機で炭酸飲料を容器本体に充填したのち、図４に示すように、容器本体（１００）の開口部に、蓋材（２００）を装着し、容器本体のプラスチックリング部（１２０）の係合部（１２２）と蓋材の周壁（２４０）の係合部（２４１）とを螺合して係合させ、さらに超音波シール法で、その係合部の係合面を熱融着して密封し、内容量２５０ｍｌの本実施例の耐圧性紙容器（１０）を作製した。
【００３５】
＜実施例４＞
まず、実施例２と同様にして、紙容器を射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、図５に示すように、胴部（１１０）上端の開口部に蓋材との螺合する係合部（１２２）を外周面にもつプラスチックリング部（１２０）を設け、胴部の容器内面側の重合部上に柱状保護部１３０）を設け、胴部と底部との結合部上に環状保護部を設けた容器本体（１０）を作製した。
【００３６】
次に、これとは別個に、実施例２と同様にして、封止フィルムを射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、図５に示すように、封止フィルム（２３０）で外側から封止された注出孔（２１１）をもつ天板（２１０）の外周縁部に周壁（２４０）を垂下し、この周壁の内周面に容器本体との螺合する係合部（２４１）をもつ蓋材（２００）を作製した。
【００３７】
そして、充填機で炭酸飲料を容器本体に充填したのち、図５に示すように、容器本体（１００）の開口部に、蓋材（２００）を装着し、容器本体のプラスチックリング部（１２０）の係合部（１２２）と蓋材の周壁（２４０）の係合部（２４１）とを螺合して係合させ、さらに超音波シール法で、その係合部の係合面を熱融着して密封し、内容量２５０ｍｌの本実施例の耐圧性紙容器（１０）を作製した。
【００３８】
＜実施例５＞
まず、実施例２と同様にして、紙容器を射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、図６に示すように、胴部（１１０）上端の開口部に蓋材との螺合する係合部（１２２）を外周面にもつプラスチックリング部（１２０）を設け、胴部の容器内面側の重合部上に柱状保護部１３０）を設け、胴部と底部との結合部上に環状保護部を設けた容器本体（１０）を作製した。
【００３９】
次に、これとは別個に、実施例２と同様にして、封止フィルムを射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、図６に示すように、封止フィルム（２３０）で外側から封止された注出孔（２１１）をもつ天板（２１０）の外周縁部に周壁（２４０）を垂下し、この周壁の内周面に容器本体との螺合する係合部（２４１）をもつ蓋材（２００）を作製した。
【００４０】
そして、充填機で炭酸飲料を容器本体に充填したのち、図６に示すように、容器本体（１００）の開口部に、蓋材（２００）を装着し、容器本体のプラスチックリング部（１２０）の係合部（１２２）と蓋材の周壁（２４０）の係合部（２４１）とを螺合して係合させ、さらに超音波シール法で、プラスチックリング部の上端面と蓋材の天板（２１０）下面との接合面（３００）を熱融着して密封し、内容量２５０ｍｌの本実施例の耐圧性紙容器（１０）を作製した。
【００４１】
＜実施例６＞
まず、実施例２と同様にして、紙容器を射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、図７に示すように、胴部（１１０）上端の開口部に蓋材との螺合する係合部（１２２）を内周面にもつプラスチックリング部（１２０）を設け、胴部の容器内面側の重合部上に柱状保護部（１３０）を設け、胴部と底部との結合部上に環状保護部を設けた容器本体（１０）を作製した。
【００４２】
次に、これとは別個に、実施例２と同様にして、封止フィルムを射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、図７に示すように、封止フィルム（２３０）で外側から封止された注出孔（２１１）をもつ天板（２１０）の外周縁部に周壁（２４０）を立設し、この周壁の外周面に容器本体との螺合する係合部（２４１）をもつ蓋材（２００）を作製した。
【００４３】
そして、充填機で炭酸飲料を容器本体に充填したのち、図７に示すように、容器本体（１００）の開口部に、蓋材（２００）を装着し、容器本体のプラスチックリング部（１２０）の係合部（１２２）と蓋材の周壁（２４０）の係合部（２４１）とを螺合して係合させ、さらに超音波シール法で、係合部の上方のプラスチックリング部の内周面と周壁の外周面との接合面（３００）を熱融着して密封し、内容量２５０ｍｌの本実施例の耐圧性紙容器（１０）を作製した。
【００４４】
＜実施例７＞
まず、実施例２と同様にして、紙容器を射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、図８に示すように、胴部（１１０）上端の開口部に蓋材との螺合する係合部（１２２）を内周面にもつプラスチックリング部（１２０）を設け、胴部の容器内面側の重合部上に柱状保護部１３０）を設け、胴部と底部との結合部上に環状保護部を設けた容器本体（１０）を作製した。
【００４５】
次に、これとは別個に、実施例２と同様にして、封止フィルムを射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、図８に示すように、封止フィルム（２３０）で外側から封止された注出孔（２１１）をもつ天板（２１０）の外周縁部の内側に周壁（２４０）を垂下し、この周壁の外周面に容器本体との螺合する係合部（２４１）をもつ蓋材（２００）を作製した。
【００４６】
そして、充填機で炭酸飲料を容器本体に充填したのち、図８に示すように、容器本体（１００）の開口部に、蓋材（２００）を装着し、容器本体のプラスチックリング部（１２０）の係合部（１２２）と蓋材の周壁（２４０）の係合部（２４１）とを螺合して係合させ、さらに超音波シール法で、プラスチックリング部（１２０）の上面と蓋材の外周縁部との接合面（３００）を熱融着して密封し、内容量２５０ｍｌの本実施例の耐圧性紙容器（１０）を作製した。
【００４７】
＜比較例１＞
まず、実施例２と同様にして、紙容器を射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、胴部上端の開口部に蓋材との螺合する係合部を内周面にもつプラスチックリング部を設け、胴部の容器内面側の重合部上に柱状保護部を設け、胴部と底部との結合部上に環状保護部を設けた容器本体を作製した。
【００４８】
次に、これとは別個に、実施例２と同様にして、封止フィルムを射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、封止フィルムで外側から封止された注出孔をもつ天板の外周縁部に周壁を立設し、この周壁の外周面に容器本体との螺合する係合部をもつ蓋材を作製した。
【００４９】
そして、充填機で炭酸飲料を容器本体に充填したのち、容器本体の開口部に、蓋材を装着し、容器本体のプラスチックリング部の係合部と蓋材の周壁の係合部とを螺合させて密封し、内容量２５０ｍｌの本比較例の耐圧性紙容器を作製した。
【００５０】
＜比較例２＞
まず、実施例２と同様にして、紙容器を射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、図９に示すように、胴部（１１１）上端の開口部に蓋材との咬合する係合部（１２２）を内周面にもつプラスチックリング部（１２０）を設け、胴部の容器内面側の重合部上に柱状保護部（１３０）を設け、胴部と底部との結合部上に環状保護部を設けた容器本体（１０）を作製した。
【００５１】
次に、これとは別個に、実施例２と同様にして、封止フィルムを射出成形金型内に載置し、型締めした後、溶融ポリエチレンを射出して、図９に示すように、封止フィルム（２３０）で外側から封止された注出孔（２１１）をもつ天板（２１０）の外周縁部に周壁（２４０）を垂設し、この周壁の外周面に容器本体との咬合する係合部（２４１）をもつ蓋材（２００）を作製した。
【００５２】
そして、充填機で炭酸飲料を容器本体に充填したのち、容器本体の開口部に、蓋材を装着し、容器本体のプラスチックリング部の係合部と蓋材の周壁の係合部とを咬合させて密封し、内容量２５０ｍｌの本比較例の耐圧性紙容器を作製した。
【００５３】
上述した炭酸飲料を充填した実施例２乃至７の６種類の耐圧性紙容器と比較例１及び２の２種類の耐圧性紙容器とを比較評価するために、各１０本ずつの容器を４０℃の温水中に２４時間浸漬させたのち、容器の外観、液漏れ、破損状態を調べた。その結果を表１に示す。
【００５４】
【表１】
【００５５】
各容器の評価結果では、表１に示すように、６種類の実施例の耐圧性紙容器では、外観性を損なう変形、液漏れ、破損が認められなかったが、２種類の比較例の容器には、係合部の異常、液漏れ、破損が認められた。
【００５６】
【発明の効果】
本発明の耐圧性紙容器は、炭酸を含む飲料などの内容物や加熱殺菌を必要とする内容物に使用しても、容器内の内圧の変動（増大又は減少）に耐え、外観性を損なうほどの著しい変形もなく、変形による容器本体と蓋材との封止状態が破損されることがなく、容器の密封性が良好である。
【００５７】
また、蓋材の天板又は容器本体の底部に開封可能な注出孔を設けることもでき、使用し易い容器である。
【図面の簡単な説明】
【図１】 本発明の実施例１の耐圧性紙容器の容器本体と蓋材の構造を示す断面図である。
【図２】 本発明の実施例１の耐圧性紙容器の容器本体に蓋材を装着したときの状態を示す部分断面図である。
【図３】 本発明の実施例２の耐圧性紙容器の容器本体に蓋材を装着したときの状態を示す部分断面図である。
【図４】 本発明の実施例３の耐圧性紙容器の容器本体に蓋材を装着したときの状態を示す部分断面図である。
【図５】 本発明の実施例４の耐圧性紙容器の容器本体に蓋材を装着したときの状態を示す部分断面図である。
【図６】 本発明の実施例５の耐圧性紙容器の容器本体に蓋材を装着したときの状態を示す部分断面図である。
【図７】 本発明の実施例６の耐圧性紙容器の容器本体に蓋材を装着したときの状態を示す部分断面図である。
【図８】 本発明の実施例７の耐圧性紙容器の容器本体に蓋材を装着したときの状態を示す部分断面図である。
【図９】 比較例２の耐圧性紙容器の容器本体に蓋材を装着したときの状態を示す部分断面図である。
【符号の説明】
１０……耐圧性紙容器
１００……容器本体
１１０……紙容器
１１１……胴部
１１２……底部
１２０……プラスチックリング部
１２１，２２１，２４０……周壁
１２２，２２２，２４１……係合部
１２３，２２３……熱融着部
１３０……柱状保護部
１４０，２２０……環状保護部
１４１，２２４……補強リブ
２００……蓋材
２１０……天板
２１１……注出孔
２３０……封止フィルム
２５０……外周リング
３００……接合面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure-resistant paper container that can withstand increase and decrease in internal pressure in a container and has good sealing properties when used for contents such as beverages containing carbonic acid and contents that require heat sterilization. is there.
[0002]
[Prior art]
Conventionally, as one-way containers such as juices and soft drinks, containers having various configurations have been known, but generally paper containers such as paper cups have been widely used. This paper container is to seal the opening of the container with a lid after filling the contents, but because the seam part where the paper material is overlapped remains in the opening, there is a step, Sealing with good sealing properties was difficult.
[0003]
Therefore, in order to improve the sealing performance by sealing the lid, a paper container in which a pre-formed plastic ring member is bonded to the opening of the paper container by means of ultrasonic waves has been proposed and put into practical use. . Furthermore, in order to prevent the penetration of the contents, etc., a paper container in which molten plastic is directly injected into the paper container, a protective part is integrally formed in the overlapping part of the container body part, and a plastic ring part is integrally formed in the opening part of the body part. These paper containers with plastic rings have strength at the opening and no step at the sealing part with the lid material. And was a container suitable for filling the liquid contents.
[0004]
[Problems to be solved by the invention]
However, since the above-described conventional paper container is a container in which a cover material such as a paper sheet, a laminated film, or a thermoplastic resin is bonded to the upper surface of the plastic ring portion by a heat fusion method, the contents are placed on the container body. In the case of a filled container and sealed with a lid material, for example, in the case of foamable contents, the lid material and the container body are significantly deformed due to internal pressure expansion, or the lid material and the container body are fused. There was a problem that the part peeled off and liquid leakage occurred.
[0005]
The present invention solves the problems of the above-described conventional paper containers, and the cover material and the container main body are significantly deformed or peeled off at the fused portion due to changes such as increase or decrease in internal pressure in the container. The present invention provides a pressure-resistant paper container that does not occur and has a good sealing property.
[0006]
[Means for Solving the Problems]
First of the present invention1The invention ofA paper container consisting of paper and consisting of a body part and a bottom part provided with a plastic layer at least on the inner surface side of the container is placed in an injection mold, clamped, and then injected with molten plastic, A plastic ring part having an engagement part with the lid member or an engagement part and a heat fusion part is provided in the opening at the upper end of the part, and a columnar protection part is provided on the overlapping part on the container inner surface side of the trunk part. A paper container in which a container body provided with an annular protective part on the joint part between the base and the bottom is sealed by engagement and heat fusion with a plastic lid having an engagement part with the container body and a heat fusion part. There,The engaging portion of the container body with the lid member is an engaging portion that is screwed into the inner peripheral surface of the plastic ring portion, and the engaging portion of the lid member with the container body is at the outer peripheral edge portion. It is an engaging part to be screwed provided on the outer peripheral surface of the peripheral wall to be erected, and engages the engaging part of the container body and the engaging part of the lid member, and the engaging surface of the engaging part It is characterized by being heat sealed and sealedResistanceIt is a pressure paper container.
0007]
Next, the first of the present invention2The invention ofA paper container consisting of paper and consisting of a body part and a bottom part provided with a plastic layer at least on the inner surface side of the container is placed in an injection mold, clamped, and then injected with molten plastic, A plastic ring part having an engagement part with the lid member or an engagement part and a heat fusion part is provided in the opening at the upper end of the part, and a columnar protection part is provided on the overlapping part on the container inner surface side of the trunk part. A paper container in which a container body provided with an annular protective part on the joint part between the base and the bottom is sealed by engagement and heat fusion with a plastic lid having an engagement part with the container body and a heat fusion part. There,The engaging portion of the container body with the lid member is an engaging portion that is screwed into the inner peripheral surface of the plastic ring portion, and the engaging portion of the lid member with the container body is at the outer peripheral edge portion. An engaging portion that is screwed into an outer peripheral surface of the peripheral wall that hangs down, engages the engaging portion of the container body and the engaging portion of the lid member, and the engaging surface of the engaging portion is It is characterized by heat sealing and sealing.ResistanceIt is a pressure paper container.
0008]
Next, the first of the present invention3The invention ofA paper container consisting of paper and consisting of a body part and a bottom part provided with a plastic layer at least on the inner surface side of the container is placed in an injection mold, clamped, and then injected with molten plastic, A plastic ring part having an engagement part with the lid member or an engagement part and a heat fusion part is provided in the opening at the upper end of the part, and a columnar protection part is provided on the overlapping part on the container inner surface side of the trunk part. A paper container in which a container body provided with an annular protective part on the joint part between the base and the bottom is sealed by engagement and heat fusion with a plastic lid having an engagement part with the container body and a heat fusion part. There,The engaging portion of the container body with the lid member is an engaging portion that is screwed on the outer peripheral surface of the plastic ring portion, and the engaging portion of the lid member with the container body is suspended from the outer peripheral edge portion. An engaging portion that engages with the inner peripheral surface of the peripheral wall, engages the engaging portion of the container body with the engaging portion of the lid member, and the engaging surface of the engaging portion is It is characterized by heat sealing and sealing.ResistanceIt is a pressure paper container.
0009]
Next, the first of the present invention4The invention ofMade of paper as the main layer, plastic at least inside the container After placing the paper container consisting of the body part and the bottom part provided with a layer in an injection mold, and clamping the mold, the molten plastic is injected, and the opening at the upper part of the body part is engaged with the lid material. A plastic ring part having a part or an engaging part and a heat fusion part, a columnar protection part on the overlapping part on the container inner surface side of the body part, and an annular protection part on the joint part of the body part and the bottom part A paper container in which the provided container body is sealed by engagement and heat fusion with a plastic lid having an engagement part with the container body and a heat fusion part,The engaging portion of the container body with the lid member is an engaging portion that is screwed on the outer peripheral surface of the plastic ring portion, and the engaging portion of the lid member with the container body is suspended from the outer peripheral edge portion. An engaging portion that engages with the inner peripheral surface of the peripheral wall, engages the engaging portion of the container body and the engaging portion of the lid member, and the upper end surface of the plastic ring portion and the It is characterized in that the joint surface between the lid and the top plate is heat-sealed and sealed.ResistanceIt is a pressure paper container.
0010]
Next, the first of the present invention5The invention ofA paper container consisting of paper and consisting of a body part and a bottom part provided with a plastic layer at least on the inner surface side of the container is placed in an injection mold, clamped, and then injected with molten plastic, A plastic ring part having an engagement part with the lid member or an engagement part and a heat fusion part is provided in the opening at the upper end of the part, and a columnar protection part is provided on the overlapping part on the container inner surface side of the trunk part. A paper container in which a container body provided with an annular protective part on the joint part between the base and the bottom is sealed by engagement and heat fusion with a plastic lid having an engagement part with the container body and a heat fusion part. There,The engaging portion of the container body with the lid member is an engaging portion that is screwed into the inner peripheral surface of the plastic ring portion, and the engaging portion of the lid member with the container body is at the outer peripheral edge portion. An engaging portion that is screwed into an outer peripheral surface of the peripheral wall to be erected, engages the engaging portion of the container main body with the engaging portion of the lid member, and the upper portion of the engaging portion The joint surface between the inner peripheral surface of the plastic ring portion and the outer peripheral surface of the peripheral wall is hermetically sealed by heat sealing.ResistanceIt is a pressure paper container.
0011]
Next, the first of the present invention6The inventionPaper is the main layer, and at least the plastic layer on the inner surface of the container A paper container composed of a body portion and a bottom portion provided with a base is placed in an injection mold, and after clamping, a molten plastic is injected, and an engagement portion with a lid material is opened at the upper end of the body portion. Alternatively, a plastic ring part having an engagement part and a heat fusion part is provided, a columnar protection part is provided on the overlapping part on the container inner surface side of the body part, and an annular protection part is provided on the joint part between the body part and the bottom part. The container body is a paper container sealed by engagement and heat fusion with a plastic lid having an engagement part with the container body and a heat fusion part,The engaging portion of the container body with the lid member is an engaging portion that is screwed into the inner peripheral surface of the plastic ring portion, and the engaging portion of the lid member with the container body is an outer peripheral edge portion. An engaging portion that is screwed into an outer peripheral surface of a peripheral wall that hangs inward, engages the engaging portion of the container body with the engaging portion of the lid member, and the upper surface of the plastic ring portion The joint surface with the outer peripheral edge of the lid member is heat-sealed and sealed.ResistanceIt is a pressure paper container.
0012]
Next, the first of the present invention7The invention is characterized in that a grid-like or annular reinforcing rib is provided on the bottom of the container body and the container inner surface side of the top plate of the lid.1 to 6It is a pressure-resistant paper container of description.
0013]
Next, the first of the present invention8The invention is characterized in that a pour-out hole that can be opened is provided in the top plate of the lid member or the bottom of the container body.1 to 7It is a pressure-resistant paper container of description.
0014]
And the first of the present invention9The invention is characterized in that the pouring hole is sealed with a sealing film so that it can be opened.8It is a pressure-resistant paper container of description.
0015]
[Action]
In the pressure-resistant paper container of the present invention, the container body is formed by insert injection molding, a plastic ring part is provided at the opening of the paper container, a plastic columnar protection part is provided on the overlapping part of the body part, and the body part and the bottom part are joined. A plastic annular protective part is provided on the part to reinforce the strength, and the plastic ring part of the opening of the container body is firmly fitted with an engagement part such as occlusion and screwing and heat fusion. And wearing. For this reason, even if the internal pressure of the container fluctuates (increases or decreases) depending on the contents, the sealed state between the container body and the lid material is not damaged, and the container has good sealing performance.
0016]
Further, the pressure-resistant paper container of the present invention in which a grid-like or annular reinforcing rib is provided on the bottom of the container main body and the container inner surface side of the top plate of the lid material is resistant to fluctuations in internal pressure due to the rigidity of the reinforcing rib. The container is difficult to deform.
0017]
DETAILED DESCRIPTION OF THE INVENTION
A pressure-resistant paper container according to an embodiment of the present invention includes a container main body and a lid member that is attached to the opening of the container main body by engagement and thermal fusion. The container body has a paper layer as a main layer, and a plastic layer such as polyethylene is provided on at least the inner surface of the container. For example, polyethylene layer / paper layer / polyethylene layer structure, polyethylene layer / paper layer / polyethylene layer / aluminum foil Layer / adhesive layer / polyethylene terephthalate layer / adhesive layer / polyethylene layer constitution, polyethylene layer / paper layer / ethylene-acrylic acid copolymer layer / polyethylene terephthalate layer / silicon oxide vapor deposition layer / adhesive layer / polyethylene layer constitution, etc. Using the laminated material, a paper container in which the bottom peripheral edge is wound and integrated in a heated state on the lower inner peripheral edge of the body is manufactured, and then the paper container is placed in an injection mold. After the mold is placed and clamped, molten plastic such as polyethylene is injected into the mold cavity (the space between the female mold and the male mold) to open the paper container. A plastic ring part having an engagement part with a cover material and a heat fusion part is formed by forming a columnar protection part on the overlapping part of the trunk part and an annular protection part on the joint part of the trunk part and the bottom part. Is.
0018]
The lid material has a paper layer as a main layer, and a plastic layer such as polyethylene is provided on at least the inner surface of the container. For example, polyethylene layer / paper layer / polyethylene layer structure, polyethylene layer / paper layer / polyethylene layer / aluminum foil layer / Lamination of adhesive layer / polyethylene terephthalate layer / adhesive layer / polyethylene layer configuration, polyethylene layer / paper layer / ethylene-acrylic acid copolymer layer / polyethylene terephthalate layer / silicon oxide vapor deposition layer / adhesive layer / polyethylene layer configuration The plate-shaped top plate made of the material is placed in an injection mold, clamped, and then molten plastic such as polyethylene is injected into the mold cavity, and the outer peripheral edge of the top plate A lid member is produced in which a peripheral wall having an engagement portion with a container main body and a heat fusion portion is formed.
0019]
After filling the container body with the contents, the engagement portion of the peripheral wall of the lid member is fitted to the engagement portion of the plastic ring of the container body and the lid member is attached, and then the heat fusion of the plastic ring of the container body is performed. The container is sealed by heat-sealing the attaching part and the heat-sealing part of the peripheral wall of the lid member by an ultrasonic sealing method or the like.
0020]
Moreover, the pressure-resistant paper container of other embodiment of this invention is an engaging part which the engaging part of the plastic ring part of a container main body screws, and a cover material is an engaging part screwed with a container main body. It has a heat fusion part and is manufactured by injection molding of molten plastic such as polyethylene.
0021]
In order to further increase the strength of the container, the pressure-resistant container of the present invention may be provided with reinforcing ribs such as a lattice shape or an annular shape on the container inner surface side of the top plate of the lid material. A reinforcing rib having a lattice shape or an annular shape may also be provided on the inner surface side of the container at the bottom. The shape of the reinforcing rib is not particularly limited, but a cross-sectional shape that is rectangular, convex, L-shaped, or the like is preferable.
0022]
In consideration of ease of use when the contents are poured out, the top plate of the lid may be provided with a pourable hole that can be opened, and the bottom of the container body can be similarly opened. A pouring hole may be provided. Usually, this pouring hole sticks and seals a sealing film on the container outer surface side so that peeling is possible.
0023]
In addition, this sealing film should just use the single-piece | unit or laminated | multilayer film which has a heat sealing layer with a cover material in a cover material contact layer, and when barrier property is required, it is used for the outer layer of a heat sealing layer. At least one of a metal foil layer, a thermoplastic resin film or paper deposited with an inorganic material such as metal or silicon oxide, an ethylene-vinyl alcohol copolymer resin layer, a polyamide resin layer, or a polyvinylidene chloride resin layer A laminated film is used.
0024]
【Example】
Next, examples of the present invention will be specifically described.
<Example 1>
First, polyethylene layer (20 μm) / paper layer (320 g / m2) / Polyethylene layer (20 μm) / polyethylene layer (15 μm) / polyethylene terephthalate layer (12 μm) / silicon oxide deposited film (500 mm) / polyethylene layer (60 μm) A paper container in which the peripheral edge portion of the bottom portion was wound and integrated in a heated state was produced.
0025]
Next, this paper container is placed in an injection mold, and after being clamped, molten polyethylene is injected into the cavity of the mold to open the opening of the paper container (110) as shown in FIG. A plastic ring part (120) having an engagement part (122) and a heat-sealing part (123) engaged with the lid member, and a columnar protection part (130) on the overlapping part of the trunk part (111). A container body (100) was produced in which an annular protective part (140) was formed on the joint between the part and the bottom part (112).
0026]
Separately from this, as shown in FIG. 1, a polyethylene layer (20 μm) / paper layer (320 g / m2) / Polyethylene layer (20 μm) / polyethylene layer (15 μm) / polyethylene terephthalate layer (12 μm) / silicon oxide vapor-deposited film (500 μm) / polyethylene layer (60 μm). The aluminum foil layer (50 μm ) / Polyethylene terephthalate (12 μm) / laminated film (45 μm) (polyethylene layer / polyvinylidene chloride layer / polyethylene layer) sealing film (230) heat-sealed so that it can be opened, top plate (210) is injection molded After placing in the mold and clamping, the molten polyethylene is injected into the cavity of the mold and has an engaging portion (222) and a heat-sealing portion (223) that engage with the outer periphery of the top plate. A lid member (200) provided with an annular protective part (220) was produced.
0027]
Next, after filling the container body with the carbonated beverage by the filling machine, as shown in FIG. 2, the lid (200) is attached to the opening of the container body (100), and the plastic ring part (120 ) And the engagement part (222) of the annular protective part (220) of the lid member are engaged with each other, and further, the heat sealing part (123) of the plastic ring part of the container body is formed by ultrasonic sealing. ) And the heat-sealing part (223) of the annular protective part of the lid member were heat-sealed and sealed to produce a pressure-resistant paper container (10) of this example having an internal volume of 250 ml.
0028]
Then, after the normal pressure distribution and storage period of the above-described pressure-resistant paper container of the present embodiment, the appearance of the container was observed, and no significant deformation of the container was observed to impair the appearance. No leaks were identified.
0029]
<Example 2>
First, a paper container similar to that in Example 1 was prepared, this paper container was placed in an injection mold, and after clamping, the molten polyethylene was injected, and as shown in FIG. 110) A plastic ring part (120) having an engagement part (122) to be screwed with the lid member on the inner peripheral surface is provided in the opening part at the upper end, and the
0030]
Next, separately from this, a sealing film having an aluminum foil layer (50 μm) / polyethylene terephthalate (12 μm) / laminated film (45 μm) (polyethylene layer / polyvinylidene chloride layer / polyethylene layer) was formed by injection molding. After being placed inside and clamped, molten polyethylene is injected, and as shown in FIG. 3, a top plate (210) having a pouring hole (211) sealed from the outside with a sealing film (230). A peripheral wall (240) is erected on the outer peripheral edge portion of), and a lid member (200) having an engaging portion (241) that engages with the container body on the outer peripheral surface of the peripheral wall is produced.
0031]
Then, after filling the container body with the carbonated beverage with a filling machine, as shown in FIG. 3, a lid (200) is attached to the opening of the container body (100), and the plastic ring part (120) of the container body The engagement portion (122) of the lid and the engagement portion (241) of the peripheral wall (240) of the lid member are screwed to engage with each other, and the engagement surface of the engagement portion is thermally fused by ultrasonic sealing. The pressure-resistant paper container (10) of this example having an inner volume of 250 ml was prepared.
0032]
<Example 3>
First, in the same manner as in Example 2, the paper container was placed in an injection mold, clamped, and then injected with molten polyethylene. As shown in FIG. 4, the upper end of the trunk (110) was opened. A plastic ring part (120) having an engagement part (122) to be screwed to the cover member on the inner peripheral surface, and a columnar protection part (130) on the overlapping part on the container inner surface side of the barrel part. A container body (10) was prepared in which an annular protective part was provided on the joint between the part and the bottom part.
0033]
Next, separately from this, in the same manner as in Example 2, the sealing film was placed in an injection mold, clamped, and then injected with molten polyethylene, as shown in FIG. A peripheral wall (240) is suspended from the outer peripheral edge of the top plate (210) having the pouring hole (211) sealed from the outside with the sealing film (230), and the outer peripheral surface of the peripheral wall is screwed with the container body. A lid member (200) having a mating engagement portion (241) was produced.
0034]
Then, after filling the container body with the carbonated beverage by the filling machine, as shown in FIG. 4, the lid (200) is attached to the opening of the container body (100), and the plastic ring part (120) of the container body is attached. The engagement portion (122) of the lid and the engagement portion (241) of the peripheral wall (240) of the lid member are screwed to engage with each other, and the engagement surface of the engagement portion is thermally fused by ultrasonic sealing. The pressure-resistant paper container (10) of this example having an inner volume of 250 ml was prepared.
0035]
<Example 4>
First, in the same manner as in Example 2, the paper container was placed in an injection mold, clamped, and then injected with molten polyethylene. As shown in FIG. 5, the upper end of the trunk (110) was opened. A plastic ring part (120) having an engaging part (122) to be screwed with a lid member is provided on the outer peripheral surface, and a columnar protection part (130) is provided on the overlapping part on the container inner surface side of the barrel part. A container body (10) having an annular protective portion on the joint between the bottom and the bottom was prepared.
0036]
Next, separately from this, in the same manner as in Example 2, the sealing film was placed in an injection mold, clamped, and then injected with molten polyethylene, as shown in FIG. A peripheral wall (240) is suspended from the outer peripheral edge of the top plate (210) having the pouring hole (211) sealed from the outside with the sealing film (230), and the container body is connected to the inner peripheral surface of the peripheral wall. A lid member (200) having an engaging portion (241) to be screwed was produced.
0037]
Then, after the carbonated beverage is filled into the container body by the filling machine, as shown in FIG. 5, the lid member (200) is attached to the opening of the container body (100), and the plastic ring part (120) of the container body is attached. The engagement portion (122) of the lid and the engagement portion (241) of the peripheral wall (240) of the lid member are screwed to engage with each other, and the engagement surface of the engagement portion is thermally fused by ultrasonic sealing. The pressure-resistant paper container (10) of this example having an inner volume of 250 ml was prepared.
0038]
<Example 5>
First, in the same manner as in Example 2, the paper container was placed in an injection mold, clamped, and then injected with molten polyethylene. As shown in FIG. 6, the upper end of the trunk (110) was opened. A plastic ring part (120) having an engaging part (122) to be screwed with a lid member is provided on the outer peripheral surface, and a columnar protection part (130) is provided on the overlapping part on the container inner surface side of the barrel part. A container body (10) having an annular protective part on the joint between the bottom and the bottom was produced.
0039]
Next, separately from this, in the same manner as in Example 2, the sealing film was placed in an injection mold, clamped, and then injected with molten polyethylene, as shown in FIG. A peripheral wall (240) is suspended from the outer peripheral edge of the top plate (210) having the pouring hole (211) sealed from the outside with the sealing film (230), and the container body is connected to the inner peripheral surface of the peripheral wall. A lid member (200) having an engaging portion (241) to be screwed was produced.
0040]
Then, after the carbonated beverage is filled into the container main body by the filling machine, as shown in FIG. 6, the lid member (200) is attached to the opening of the container main body (100), and the plastic ring part (120) of the container main body is attached. The engaging portion (122) of the lid and the engaging portion (241) of the peripheral wall (240) of the lid member are screwed to engage with each other, and the upper end surface of the plastic ring portion and the top of the lid member are further sealed by ultrasonic sealing. The joint surface (300) with the lower surface of the plate (210) was heat-sealed and sealed to prepare a pressure-resistant paper container (10) of this example having an internal volume of 250 ml.
0041]
<Example 6>
First, in the same manner as in Example 2, the paper container was placed in an injection mold, clamped, and then injected with molten polyethylene. As shown in FIG. 7, the upper end of the trunk (110) was opened. A plastic ring part (120) having an engagement part (122) to be screwed with the lid material on the inner peripheral surface, and a columnar protection part (130) on the overlapping part on the container inner surface side of the body part; A container body (10) having an annular protective part on the joint between the body part and the bottom part was produced.
0042]
Next, separately from this, in the same manner as in Example 2, the sealing film was placed in an injection mold, clamped, and then injected with molten polyethylene, as shown in FIG. A peripheral wall (240) is erected on the outer peripheral edge of the top plate (210) having the pouring hole (211) sealed from the outside with the sealing film (230), and the outer peripheral surface of the peripheral wall is connected to the container body. A lid member (200) having an engaging portion (241) to be screwed was produced.
0043]
Then, after the carbonated beverage is filled into the container body with the filling machine, as shown in FIG. 7, a lid (200) is attached to the opening of the container body (100), and the plastic ring part (120) of the container body is attached. The engagement portion (122) of the cover and the engagement portion (241) of the peripheral wall (240) of the lid member are screwed together to engage with each other, and further, the inside of the plastic ring portion above the engagement portion is formed by ultrasonic sealing. The joint surface (300) between the peripheral surface and the outer peripheral surface of the peripheral wall was heat-sealed and sealed to prepare a pressure-resistant paper container (10) of this example having an internal volume of 250 ml.
0044]
<Example 7>
First, in the same manner as in Example 2, the paper container was placed in an injection mold, clamped, and then molten polyethylene was injected to open the upper end of the trunk (110) as shown in FIG. A plastic ring part (120) having an engagement part (122) to be screwed to the cover member on the inner peripheral surface, and a columnar protection part (130) on the overlapping part on the container inner surface side of the barrel part. A container body (10) was prepared in which an annular protective part was provided on the joint between the part and the bottom part.
0045]
Next, separately from this, in the same manner as in Example 2, the sealing film was placed in an injection mold, clamped, and then injected with molten polyethylene, as shown in FIG. A peripheral wall (240) is suspended inside the outer peripheral edge of the top plate (210) having the pouring hole (211) sealed from the outside with the sealing film (230), and the container main body is attached to the outer peripheral surface of the peripheral wall. A lid member (200) having an engaging portion (241) to be screwed was prepared.
0046]
Then, after filling the container body with the carbonated beverage by the filling machine, as shown in FIG. 8, the lid member (200) is attached to the opening of the container body (100), and the plastic ring part (120) of the container body is attached. The engagement portion (122) of the lid and the engagement portion (241) of the peripheral wall (240) of the lid member are screwed to engage with each other, and the upper surface of the plastic ring portion (120) and the lid member are further joined by ultrasonic sealing. The pressure-sensitive paper container (10) of this example having an internal volume of 250 ml was produced by heat-sealing and sealing the joint surface (300) with the outer peripheral edge.
0047]
<Comparative Example 1>
First, in the same manner as in Example 2, after placing the paper container in the injection mold and clamping the mold, the molten polyethylene is injected, and the opening at the upper end of the barrel is screwed with the lid member. A container body having a plastic ring portion having an inner peripheral surface on the inner peripheral surface, a columnar protective portion on the overlapping portion on the inner surface side of the barrel portion, and an annular protective portion on the coupling portion between the barrel portion and the bottom portion is provided. Produced.
0048]
Next, separately from this, in the same manner as in Example 2, the sealing film was placed in an injection mold, and after clamping, the molten polyethylene was injected and sealed with the sealing film from the outside. A peripheral wall was erected on the outer peripheral edge portion of the top plate having the stopped pouring hole, and a lid member having an engaging portion engaged with the container body on the outer peripheral surface of the peripheral wall was produced.
0049]
After the carbonated beverage is filled into the container body by the filling machine, a lid is attached to the opening of the container body, and the engaging part of the plastic ring part of the container body and the engaging part of the peripheral wall of the lid material are screwed. These were sealed together to produce a pressure-resistant paper container of this comparative example having an internal volume of 250 ml.
0050]
<Comparative example 2>
First, in the same manner as in Example 2, the paper container was placed in an injection mold, clamped, and then injected with molten polyethylene. As shown in FIG. 9, the upper end of the trunk (111) was opened. A plastic ring part (120) having an engagement part (122) engaged with the lid material on the inner peripheral surface is provided on the part, and a columnar protection part (130) is provided on the overlapping part on the container inner surface side of the trunk part. A container body (10) was prepared in which an annular protective part was provided on the joint between the part and the bottom part.
0051]
Next, separately from this, in the same manner as in Example 2, the sealing film was placed in an injection mold, clamped, and then injected with molten polyethylene, as shown in FIG. A peripheral wall (240) is suspended from the outer peripheral edge of the top plate (210) having the pouring hole (211) sealed from the outside with the sealing film (230), and the outer peripheral surface of the peripheral wall is connected to the container body. A lid member (200) having an engaging portion (241) to be engaged was produced.
0052]
Then, after filling the container body with carbonated beverage with a filling machine, a lid is attached to the opening of the container body, and the engaging part of the plastic ring part of the container body and the engaging part of the peripheral wall of the lid material are engaged. The pressure-resistant paper container of this comparative example having an internal volume of 250 ml was produced.
0053]
In order to compare and evaluate the six types of pressure-resistant paper containers of Examples 2 to 7 filled with the carbonated beverage described above and the two types of pressure-resistant paper containers of Comparative Examples 1 and 2, 40 containers of 10 each were used. After immersing in warm water at 0 ° C. for 24 hours, the appearance, liquid leakage, and breakage of the container were examined. The results are shown in Table 1.
0054]
[Table 1]
0055]
In the evaluation results of each container, as shown in Table 1, in the six types of pressure-resistant paper containers, deformation, liquid leakage, and damage that impair the appearance were not recognized. , Abnormalities in the engaging portion, liquid leakage, and damage were observed.
0056]
【The invention's effect】
Even if the pressure-resistant paper container of the present invention is used for contents such as beverages containing carbonic acid or contents that require heat sterilization, it can withstand fluctuations (increase or decrease) of internal pressure in the container and impair the appearance. There is no remarkable deformation, and the sealing state between the container main body and the lid material due to the deformation is not damaged, and the sealing performance of the container is good.
0057]
In addition, an opening that can be opened can be provided on the top plate of the lid member or the bottom of the container body, which makes the container easy to use.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the structure of a container body and a lid member of a pressure-resistant paper container according to Embodiment 1 of the present invention.
FIG. 2 is a partial cross-sectional view showing a state when a lid is attached to the container main body of the pressure-resistant paper container of Example 1 of the present invention.
FIG. 3 is a partial cross-sectional view showing a state when a lid is attached to the container main body of the pressure-resistant paper container of Example 2 of the present invention.
FIG. 4 is a partial cross-sectional view showing a state when a lid is attached to the container main body of the pressure-resistant paper container of Example 3 of the present invention.
FIG. 5 is a partial cross-sectional view showing a state when a lid is attached to the container main body of the pressure-resistant paper container of Example 4 of the present invention.
FIG. 6 is a partial cross-sectional view showing a state when a lid is attached to the container body of the pressure-resistant paper container of Example 5 of the present invention.
FIG. 7 is a partial cross-sectional view showing a state when a lid is attached to the container body of the pressure-resistant paper container of Example 6 of the present invention.
FIG. 8 is a partial cross-sectional view showing a state when a lid is attached to the container body of the pressure-resistant paper container of Example 7 of the present invention.
9 is a partial cross-sectional view showing a state when a lid is attached to the container body of the pressure-resistant paper container of Comparative Example 2. FIG.
[Explanation of symbols]
10 …… Pressure resistant paper container
100: Container body
110 …… Paper container
111 …… Body
112 …… Bottom
120 …… Plastic ring part
121, 221, 240 ... Perimeter wall
122, 222, 241 ... engaging portion
123, 223 ... Heat-sealed part
130 …… Columnar protection part
140, 220 ... annular protective part
141,224 …… Reinforcing ribs
200 …… Cover material
210 …… Top plate
211 …… Pouring hole
230 …… Sealing film
250 …… Outer ring
300 …… Joint surface
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03694298A JP4168470B2 (en) | 1998-02-19 | 1998-02-19 | Pressure-resistant paper container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03694298A JP4168470B2 (en) | 1998-02-19 | 1998-02-19 | Pressure-resistant paper container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11226996A JPH11226996A (en) | 1999-08-24 |
| JP4168470B2 true JP4168470B2 (en) | 2008-10-22 |
Family
ID=12483815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03694298A Expired - Fee Related JP4168470B2 (en) | 1998-02-19 | 1998-02-19 | Pressure-resistant paper container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4168470B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017028216A1 (en) * | 2015-08-18 | 2017-02-23 | 陈学良 | Collapsible meal box and use method therefor |
-
1998
- 1998-02-19 JP JP03694298A patent/JP4168470B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11226996A (en) | 1999-08-24 |
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