JP4099864B2 - Pressure-resistant paper container - Google Patents
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- JP4099864B2 JP4099864B2 JP17938998A JP17938998A JP4099864B2 JP 4099864 B2 JP4099864 B2 JP 4099864B2 JP 17938998 A JP17938998 A JP 17938998A JP 17938998 A JP17938998 A JP 17938998A JP 4099864 B2 JP4099864 B2 JP 4099864B2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
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- Injection Moulding Of Plastics Or The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
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るが、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、内圧上昇により、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、図1に示すように、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(111)及び底部(112)とからなる紙容器(110)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係合する周壁(121)と接着部(123)とを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を(130)を設け、胴部と底部との結合部上に環状保護部(140)を設けた容器本体(100)を、バリア層を含む積層フィルムからなる天板(210)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、前記天板の外周に容器本体との係合部(222)と接着部(223)とをもつ環状保護部(220)を設けた蓋材(200)で、図2に示すように、前記容器本体(100)のプラスチックリング部(120)に前記蓋材(200)の環状保護部(220)を係合し、かつ本体及び蓋材と同材質あるいは融着可能なフィルム(300)を介して熱融着して密封したことを特徴する耐圧性紙容器(10)である。
【0007】
次に、本発明の第2の発明は、図1に示すように、前記容器本体(100)の底部(112)及び前記蓋材(200)の天板(210)の容器内面側に、格子状又は環状の補強リブ(141、224)を設けたことを特徴とする第1の発明に記載の耐圧性紙容器(10)である。
【0008】
次に、本発明の第3の発明は、図1に示すように、前記蓋材(200)の天板(210)又は前記容器本体(100)の底部(112)に開封可能な注出孔(211)を設けたことを特徴とする第1の発明又は第2の発明に記載の耐圧性紙容器(10)である。
【0009】
次に、本発明の第4の発明は、図1及び図2に示すように、前記注出孔(211)を封止フィルム(230)で開封可能に封止したことを特徴とする第3の発明に記載の耐圧性紙容器(10)である。
【0010】
【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、蓋材が嵌合と熱溶着との併用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。
【0011】
容器本体と蓋材との熱融着において、プラスチックフィルムを利用してこれを超音波シール時に溶着して接合させるため、射出成形でエネルギーダイレクターを設ける必要がなくなり成形金型の構造が容易となる。プラスチックフィルムの材質は、容器本体と蓋材とに接着可能な樹脂であればよく、これにより通常の超音波シール法に比べ、容器本体と蓋材が同材質に限定しなくてすみ、材質選定の巾が広がる。
【0012】
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。
【0013】
【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すると共に、環状フィルムを介して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係合する周壁と、接着する接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状に環状保護部を形成させて作製するものである。
【0014】
蓋材は、バリア層を含み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/アルミニウム箔層/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であるインサート部材を、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、インサート部材の外周縁部に、プラスチックリング部の周壁に係合する係合部と、プラスチックリング部の接着部と熱融着する接着部を持つ周壁からなる環状保護部を形成させた蓋材を作製するものである。
【0015】
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部の接着部上に容器本体と蓋材との同一材料あるいは、何れにも接着可能な環状フィルムをのせておき、容器本体のプラスチックリング部の係合部に蓋材の周壁の係合部を嵌着して蓋材を装着する。次に容器本体のプラスチックリング部の接着部と蓋材の接着部とを超音波加工してサンドイッチされているフィルムを熱融着して、容器を封止するものである。
【0016】
また、本発明では容器本体と蓋材の係合部を嵌着しているが、これに限定されることなく螺合や圧入による方式でも差し障りがない。
【0017】
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よく、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よい。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字状のものが好ましい。
【0018】
また、内容物の注出時の使用しやすさを考慮して、蓋材の天板に、開封可能な注出孔を設けてもよく、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よい。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。
【0019】
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よく、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。
【0020】
【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)構成からなる積層材料を用いて、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て外径φ66、高さ120mmの紙容器を作製した。
【0021】
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)の開口部に蓋材と係合する周壁(121)と、接着する接着部(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。
【0022】
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(35μm)/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、天板の外周に容器本体の周壁と咬合する係合部(222)と、容器本体の接着部と熱融着する接着部(223)とをもつ環状保護部(220)を設けた蓋材(200)を作製した。
【0023】
次に、充填機で炭酸水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、厚み100μmの環状のポリエチレンフィルム(300)を介して蓋材(200)を装着した。このとき容器本体のプラスチックリング部(120)の周壁(121)と蓋材の環状保護部(220)の係合部(222)とは嵌合され、これを超音波シール法で、中間にある環状のポリエチレンフィルム(300)を溶着して容器本体のプラスチックリング部の接着部(123)と蓋材の環状保護部の接着部(223)と接着して密封し、内容量350mlの本実施例の耐圧性紙容器(10)を作製した。
【0024】
そして、上述の本実施例の耐圧性紙容器を、40℃の雰囲気に1週間保存したのち、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。
【0025】
〈実施例2〉
まず、実施例1と同様にして、紙容器を射出成形金型内に載置し、溶融ポリエチレンを射出して、紙容器の開口部に蓋材と咬合する周壁と接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た容器本体を作製した。
【0026】
次に、これとは別個に、ポリプロピレン層(50μm)/ポリエチレンテレフタレート層(9μm)/紙層(295g/m2 )/ポリエチレンテレフタレート層(12μm)/酸化珪素蒸着膜(500Å)/ポリプロピレン層(50μm)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/ポリプロピレン層)構成の封止フィルムを開封可能に熱融着した天板を射出成形金型内に載置し、溶融ポリプロピレンを射出して、天板の外周に容器本体のプラスチックリング部と咬合する係合部と、接着する接着部とをもつ環状保護部を設けた蓋材を作製した。
【0027】
そして、充填機で炭酸水を容器本体に充填したのち、容器本体の開口部に、厚み50μmエチレンビニルアセテートフィルムを介して蓋材を装着した。このとき容器本体のプラスチックリング部の周壁と蓋材の環状保護部の係合部とは嵌合され、これを超音波シール法で、エチレンビニルアセテートフィルムを溶着して容器本体と蓋材とを密封した。
【0028】
〈比較例1〉
まず、実施例1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、開口部に蓋材と咬合する周壁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作製した。
【0029】
次に、これとは別個に、実施例1と同様にして、封止フィルムを熱融着した天板を、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、天板の外周に容器本体のプラスチックリング部と咬合する係合部をもつ環状保護部を設けた蓋材を作製した。
【0030】
そして、充填機で炭酸水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環状保護部の係合部とを嵌合させて密封し、内容量350mlの本比較例の耐圧性紙容器を作製した。
【0031】
〈比較例2〉
まず、実施例1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、開口部に蓋材との接着部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作製した。
【0032】
次に、これとは別個に、実施例1と同様にして、封止フィルムを熱融着した天板を、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、天板の外周に容器本体のプラスチックリング部と接着する接着部をもつ環状保護部を設けた蓋材を作製した。
【0033】
次に、充填機で炭酸水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た。これを超音波シール法で溶着して容器本体のプラスチックリング部の接着部と蓋材の環状保護部の接着部とを接着して密封し、内容量350mlの本比較例の耐圧性紙容器を作製した。
【0034】
上述した炭酸水を充填した実施例1及び2と比較例1及び2の耐圧性紙容器を比較評価のために、各10本ずつの容器を40℃の雰囲気に1週間保存したのち、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。
【0035】
【表1】
【0036】
各容器の評価結果では、表1に示すように、2種類の実施例の耐圧性紙容器では、外観を損なう変形、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。
【0037】
【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。
【0038】
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、新規の紙容器といっても過言ではない。
【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。
【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‥‥周壁
123、223‥‥接着部
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
222‥‥係合部
230‥‥封止フィルム
300‥‥環状フィルム[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 are 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 an increase in internal pressure, 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]
As shown in FIG. 1, the first invention of the present invention is a paper container (110) comprising a body (111) and a bottom (112) having paper as a main layer and a plastic layer at least on the inner surface of the container. Is placed in an injection mold, clamped, and then injected with molten plastic to have a peripheral wall (121) and an adhesive portion (123) that engage with the lid at the opening at the upper end of the body. A container provided with a plastic ring part (120), provided with a columnar protection part (130) on the overlapping part on the inner surface side of the container part of the trunk part, and provided with an annular protection part (140) on the joint part between the trunk part and the bottom part The main body (100) is placed on a top plate (210) made of a laminated film including a barrier layer in an injection mold, and after being clamped, molten plastic is injected, and a container main body is placed on the outer periphery of the top plate. Ring-shaped protective part having an engaging part (222) and an adhesive part (223) 220), the annular protective part (220) of the lid member (200) is engaged with the plastic ring part (120) of the container body (100) as shown in FIG. The pressure-resistant paper container (10) is characterized in that it is heat-sealed and sealed through the same material as the main body and the lid material or a film (300) that can be fused.
[0007]
Next, as shown in FIG. 1, the second invention of the present invention has a grid on the container inner surface side of the bottom (112) of the container body (100) and the top plate (210) of the lid member (200). A pressure-resistant paper container (10) according to the first aspect of the present invention, wherein a reinforcing rib (141, 224) having a shape or a ring is provided.
[0008]
Next, as shown in FIG. 1, the third invention of the present invention is a pouring hole that can be opened in the top plate (210) of the lid member (200) or the bottom (112) of the container body (100). (211) is provided. The pressure-resistant paper container (10) according to the first invention or the second invention.
[0009]
Next, as shown in FIGS. 1 and 2, the fourth invention of the present invention is characterized in that the pouring hole (211) is sealed with a sealing film (230) so as to be opened. It is a pressure-resistant paper container (10) as described in this invention.
[0010]
[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 a lid is firmly attached to the plastic ring part of the opening of the container body by a combination of fitting and heat welding. 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.
[0011]
In the heat fusion between the container body and the lid material, a plastic film is used for welding and joining at the time of ultrasonic sealing, so there is no need to provide an energy director in injection molding, and the structure of the molding die is easy. Become. The material of the plastic film may be any resin that can be bonded to the container body and the lid material, so that the container body and the lid material do not have to be limited to the same material compared to the normal ultrasonic sealing method, and the material selection The width of
[0012]
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.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A pressure-resistant paper container according to an embodiment of the present invention includes a container body and a lid member that engages with an opening of the container body and is attached by thermal fusion via an annular film. 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 with a peripheral wall that engages with the lid and an adhesive part to be bonded is formed by forming a columnar protective part on the overlapping part of the body part and an annular protective part in the form of a joint part of the body part and the bottom part. To do.
[0014]
The lid material includes a barrier layer and a plastic layer such as polyethylene is provided at least on the inner surface side of the container. For example, polyethylene layer / aluminum foil layer / polyethylene layer configuration, polyethylene layer / paper layer / polyethylene layer / aluminum foil layer / adhesive Laminate materials such as layer / polyethylene terephthalate layer / adhesive layer / polyethylene layer structure, polyethylene layer / paper layer / ethylene-acrylic acid copolymer layer / polyethylene terephthalate layer / silicon oxide vapor deposition layer / adhesive layer / polyethylene layer structure After placing the insert member, which is a plate-shaped top plate, used in the injection mold, and clamping the mold, a molten plastic such as polyethylene is injected into the mold cavity to remove the insert member from the insert member. An engagement portion that engages with the peripheral wall of the plastic ring portion, and a plastic ring portion It is intended to produce a lid member to form a cyclic protecting portion comprising a peripheral wall having an adhesive portion to thermally fuse the adhering part.
[0015]
And after filling the container body with the contents, put the same material of the container body and the lid material on the adhesive part of the plastic ring part of the container body or an annular film that can be bonded to either, The cover member is mounted by fitting the engagement portion of the peripheral wall of the cover member to the engagement portion of the plastic ring portion. Next, the bonded portion of the plastic ring portion of the container body and the bonded portion of the lid member are ultrasonically processed to heat-seal the sandwiched film, thereby sealing the container.
[0016]
Moreover, in this invention, although the engaging part of a container main body and a lid | cover material is fitted, it is not limited to this, There is no trouble in the system by screwing or press fit.
[0017]
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 the cross-sectional shape is preferably rectangular, convex, or L-shaped.
[0018]
In consideration of ease of use when dispensing the contents, an opening that can be opened may be provided in the top plate of the lid, 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.
[0019]
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 an 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.
[0020]
【Example】
Next, examples of the present invention will be specifically described.
<Example 1>
First, polyethylene layer (20 μm) / paper layer (320 g / m 2 ) / polyethylene layer (20 μm) / polyethylene layer (15 μm) / polyethylene terephthalate layer (12 μm) / silicon oxide vapor deposition film (500 mm) / polyethylene layer (60 μm) Using the laminated material, a paper container having an outer diameter of φ66 and a height of 120 mm was manufactured by winding and integrating the peripheral part of the bottom with the lower inner peripheral part of the body part in a heated state.
[0021]
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 a peripheral wall (121) to be engaged with the lid member and an adhesive part (123) to be bonded, a columnar protection part (130) on the overlapping part of the trunk part (111), and a trunk part A container body (100) was produced in which an annular protective part (140) was formed on the joint between the bottom part and the bottom part (112).
[0022]
Separately from this, as shown in FIG. 1, a polyethylene layer (20 μm) / paper layer (320 g / m 2 ) / polyethylene (35 μm) / polyethylene terephthalate layer (12 μm) / silicon oxide vapor-deposited film (500 mm) / Made of a laminated material with a polyethylene layer (60 μm) structure, and sealed with an aluminum foil layer (50 μm) / polyethylene terephthalate (12 μm) / laminated film (45 μm) (polyethylene layer / polyvinylidene chloride layer / polyethylene layer) in the pouring hole The top plate (210) heat-sealed so that the film (230) can be opened is placed in an injection mold, and the mold is clamped. Then, molten polyethylene is injected into the cavity of the mold, and the outer periphery of the top plate An annular protective part (2) having an engaging part (222) engaged with the peripheral wall of the container body and an adhesive part (223) thermally bonded to the adhesive part of the container body 0) was prepared lid member (200) provided with.
[0023]
Next, after filling the container main body with carbonated water with a filling machine, as shown in FIG. 2, a lid material (200) is inserted into the opening of the container main body (100) through an annular polyethylene film (300) having a thickness of 100 μm. ). At this time, the peripheral wall (121) of the plastic ring part (120) of the container body and the engaging part (222) of the annular protective part (220) of the lid are fitted, and this is in the middle by ultrasonic sealing. In this embodiment, an annular polyethylene film (300) is welded and adhered and sealed to the adhesive portion (123) of the plastic ring portion of the container body and the adhesive portion (223) of the annular protective portion of the lid, and the content is 350 ml. A pressure-resistant paper container (10) was prepared.
[0024]
And after storing the pressure-resistant paper container of the above-mentioned Example in an atmosphere of 40 ° C. for 1 week, when the appearance of the container was observed, there was no remarkable deformation of the container so as to impair the appearance, No liquid leakage was confirmed.
[0025]
<Example 2>
First, in the same manner as in Example 1, a paper container is placed in an injection mold, molten polyethylene is injected, and a plastic ring part having a peripheral wall and an adhesive part engaging with a lid member at the opening of the paper container A container main body was produced in which a columnar protective part was formed on the overlapping part of the body part and an annular protective part was formed on the joint part of the body part and the bottom part.
[0026]
Next, separately from this, polypropylene layer (50 μm) / polyethylene terephthalate layer (9 μm) / paper layer (295 g / m 2 ) / polyethylene terephthalate layer (12 μm) / silicon oxide deposited film (500 μm) / polypropylene layer (50 μm) ) Consisting of laminated material, sealing film with aluminum foil layer (50 μm) / polyethylene terephthalate (12 μm) / laminated film (45 μm) (polyethylene layer / polyvinylidene chloride layer / polypropylene layer) can be opened in the pouring hole Place the heat-sealed top plate in the injection mold, inject molten polypropylene, and engage the plastic ring part of the container body on the outer periphery of the top plate and the adhesive part to be bonded A lid member provided with an annular protective part was prepared.
[0027]
Then, after filling the container body with carbonated water using a filling machine, a lid member was attached to the opening of the container body through a 50 μm thick ethylene vinyl acetate film. At this time, the peripheral wall of the plastic ring part of the container body and the engaging part of the annular protective part of the lid material are fitted, and this is welded with an ethylene vinyl acetate film by an ultrasonic sealing method to connect the container body and the lid material. Sealed.
[0028]
<Comparative example 1>
First, in the same manner as in Example 1, after placing the paper container in the injection mold and clamping the mold, the molten polyethylene is injected, and a plastic ring portion having a peripheral wall that engages with the lid material is formed in the opening. A container main body was prepared in which a columnar protective portion was provided on the overlapping portion of the barrel portion on the inner surface side of the vessel, and an annular protective portion was provided on the coupling portion between the barrel portion and the bottom portion.
[0029]
Next, separately from this, in the same manner as in Example 1, the top plate on which the sealing film was heat-sealed was placed in an injection mold, clamped, and then injected with molten polyethylene. Then, a lid member provided with an annular protective part having an engaging part that meshes with the plastic ring part of the container body on the outer periphery of the top plate was produced.
[0030]
Then, after filling the container body with carbonated water 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 annular protective part of the lid Were sealed to produce a pressure-resistant paper container of this comparative example having an internal volume of 350 ml.
[0031]
<Comparative example 2>
First, in the same manner as in Example 1, after placing the paper container in the injection mold and clamping the mold, the molten polyethylene was injected to form a plastic ring part having an adhesive part with the lid at the opening. A container main body was prepared in which a columnar protective portion was provided on the overlapping portion of the barrel portion on the inner surface side of the vessel, and an annular protective portion was provided on the coupling portion between the barrel portion and the bottom portion.
[0032]
Next, separately from this, in the same manner as in Example 1, the top plate on which the sealing film was heat-sealed was placed in an injection mold, clamped, and then injected with molten polyethylene. Then, a lid member in which an annular protective part having an adhesive part that adheres to the plastic ring part of the container main body was provided on the outer periphery of the top plate was produced.
[0033]
Next, after filling the container body with carbonated water using a filling machine, a lid was attached to the opening of the container body. The pressure-resistant paper container of this comparative example having an internal capacity of 350 ml is welded by an ultrasonic sealing method to adhere and seal the adhesive part of the plastic ring part of the container body and the adhesive part of the annular protective part of the lid. Produced.
[0034]
For the comparative evaluation of the pressure-resistant paper containers of Examples 1 and 2 and Comparative Examples 1 and 2 filled with carbonated water described above, 10 containers each were stored in an atmosphere of 40 ° C. for 1 week, Appearance, leakage, and damage were examined. The results are shown in Table 1.
[0035]
[Table 1]
[0036]
In the evaluation results of each container, as shown in Table 1, in the pressure-resistant paper containers of the two types of examples, deformation, liquid leakage, and damage that impair the appearance were not recognized. The abnormality of the engaging part, liquid leakage, and damage were observed.
[0037]
【The invention's effect】
Even if the pressure-resistant paper container of the present invention is used for contents such as carbonated beverages or contents that require heat sterilization, it can withstand fluctuations (increase or decrease) in the internal pressure of the container and impair the appearance. There is no significant deformation, and the sealed 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.
[0038]
Moreover, it is also an exaggeration to say that a new paper container can be provided in the top plate of the lid member or the bottom of the container body.
[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.
[Explanation of symbols]
10. Pressure
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP17938998A JP4099864B2 (en) | 1998-06-25 | 1998-06-25 | Pressure-resistant paper container |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP17938998A JP4099864B2 (en) | 1998-06-25 | 1998-06-25 | Pressure-resistant paper container |
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JP2000006944A JP2000006944A (en) | 2000-01-11 |
JP4099864B2 true JP4099864B2 (en) | 2008-06-11 |
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JP17938998A Expired - Fee Related JP4099864B2 (en) | 1998-06-25 | 1998-06-25 | Pressure-resistant paper container |
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SE1200506A1 (en) * | 2012-08-22 | 2014-02-23 | Stora Enso Oyj | Method of forming a finishing edge of a package, packaging and a molding tool |
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1998
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