JP2003166895A - Barrier performance inspection method of paper container - Google Patents
Barrier performance inspection method of paper containerInfo
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- JP2003166895A JP2003166895A JP2001369922A JP2001369922A JP2003166895A JP 2003166895 A JP2003166895 A JP 2003166895A JP 2001369922 A JP2001369922 A JP 2001369922A JP 2001369922 A JP2001369922 A JP 2001369922A JP 2003166895 A JP2003166895 A JP 2003166895A
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- Prior art keywords
- paper container
- helium gas
- paper
- concentration
- container
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- 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.)
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Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、密封して使用され
る紙容器のバリア性検査方法に関する。
【０００２】
【従来の技術】液体を収容する容器として紙容器が多く
使用されているが、内容物が酸素に触れると劣化するジ
ュースや酒、醤油といったものである場合、かかる内容
物の長期保存を図るために、内容物を収容し密封した紙
容器の空隙部、例えば、ゲーベルトップ型紙容器ではそ
の頂部空隙部に窒素ガスを充填してガス置換を行うとい
った手段が講じられている。
【０００３】しかし、内容物を収容し密封した紙容器の
空隙部に窒素ガスを充填してガス置換を行っても、紙容
器のガスバリア性が十分でないと、紙容器の空隙部に充
填した窒素ガスは紙容器を透過して大気中にもれ出す一
方、大気中の酸素がこの空隙部に侵入して、窒素ガスと
酸素とが経時的に置き換わってしまい、内容物の長期保
存が果たせなくなる場合がある。これは、容器材料自体
のバリア性、紙容器成型時に発生する微小なピンホール
の存在、紙容器シール部のシール特性、紙容器開封部に
施される抗接着剤の面積、形状等に起因する。
【０００４】このため、内容物の長期保存に要するバリ
ア性を有する紙容器を得るため、バリア性ある容器材料
や、紙容器シール部のヒートシール温度及び／又は開封
部に施される抗接着剤の面積・形状等が種々検討され、
これらの選定や決定に当たっては、これらが紙容器のバ
リア性に及ぼす影響を判定する検査が行われている。こ
の紙容器のバリア性検査方法として、従来は、紙容器の
空隙部に窒素ガスを充填して封緘した紙容器について、
その空隙部の酸素濃度を経時的に計測し、酸素濃度の増
加率を求めることで行っていた。
【０００５】
【発明が解決しようとする課題】しかしながら、前記の
紙容器のバリア性検査方法では、紙容器の空隙部の窒素
ガスと大気中の酸素とが置換して、紙容器内に入ってき
た酸素濃度を計測するところから、次のような問題点が
ある。
【０００６】置換される窒素と酸素はいずれも分子量が
大きいため、窒素ガスが紙容器から大気中に抜けるにし
ても、また酸素が大気中から紙容器内に入るにしても、
ある程度の時間がかかり、作業性が悪い。また、置換さ
れる窒素と酸素はいずれも大気中に存在し、特に、窒素
は大気中に約８割も存在している。一方、酸素は紙容器
内容物にも溶存しており、紙容器の酸素濃度が低い場合
には、この溶存酸素の一部が気化して空隙部に移行する
と考えられる。このため、バリア性の良否による酸素濃
度の差がそれほど大きく出ず、正確性に欠ける。従っ
て、紙容器成型時に発生する微小なピンホールや紙容器
シール部のシール特性の僅かな相違等によるバリアの差
は、検出することが困難で、これらがバリア性に及ぼす
影響を判定することができない。
【０００７】本発明の目的は、紙容器のバリア性を短時
間で且つ正確・精密に検査することができる紙容器のバ
リア性検査方法を提供することにある。
【０００８】
【課題を解決するための手段】上記目的を達成するため
に、本発明に係る紙容器のバリア性検査方法は、紙容器
空隙部にヘリウムガスを充填して封緘し、封緘後、紙容
器空隙部のヘリウムガス濃度（置換率）を経時的に計測
し、ヘリウムガス濃度を指標として紙容器のバリア性を
検査することを特徴とする。
【０００９】かかる構成から、紙容器空隙部に充填した
ヘリウムガスは、分子量が小さく、紙容器から大気中に
スムーズに抜けるため、検査を短時間で行うことができ
て、その作業性が向上し、また、ヘリウムガスは大気中
に殆ど存在しないので、バリア性の良否によるヘリウム
ガス濃度の差が大きく出て、正確な検査を可能にし、更
には、紙容器成型時に発生する微小なピンホールや紙容
器シール部のシール特性の僅かな相違等によるバリアの
差も検出することができ、これらがバリア性に及ぼす影
響を容易に判定することができる。また、ヘリウムガス
は不活性ガスなので安全である。
【００１０】
【発明の実施の形態】以下、本発明に係る紙容器のバリ
ア性検査方法の実施の形態について説明する。本発明で
は、まず、紙容器の封緘直前にヘリウムガスをその空隙
内に吹き込み、紙容器の空隙部の空気をヘリウムガスに
置換して封緘する。
【００１１】このようにして紙容器を封緘したら、でき
るだけ間を置かずに、前記空隙部内に充填されているヘ
リウムガスの濃度を計測し、初期値のヘリウムガス濃度
として記録する。この後、所定の時間経過後に、同一条
件で作成し、やはり同一条件でその空隙部内にヘリウム
ガスを充填した紙容器の前記空隙部内のヘリウムガスの
濃度を計測し、初期値のヘリウムガス濃度に対する所定
の時間経過後のヘリウムガス濃度の減少を指標として、
紙容器のバリア性を判定する。
【００１２】前記のように、紙容器の封緘直前にヘリウ
ムガスを吹き込み、封緘直後の空隙部内のヘリウムガス
の濃度を初期値のヘリウムガス濃度とするが、ヘリウム
ガスの充填圧力によって前記空隙部内のヘリウムガス濃
度の初期値が異なってくるため、前準備としてヘリウム
ガスの充填圧力について検証を行う必要がある。
【００１３】つまり、ヘリウム自体分子量が小さいた
め、前記空隙部にヘリウムガスを充填する場合、従来行
われてきた窒素ガスの充填圧力よりも高くしなければ前
記空隙部がヘリウムガスで満たされない。例えば、紙容
器がゲーベルトップ型である場合、その頂部空隙部にヘ
リウムガスを充填する場合、圧力を少なくとも３ＫＰａ
程度としないと空隙部内のヘリウムガスの濃度の初期
値、即ちヘリウムガスと空気との置換率が４０％以下に
なる場合もあり、この程度の濃度では、紙容器のバリア
性の検査に必ずしも適するとはいえない。
【００１４】紙容器のバリア性の検査には、空隙部内に
充填されたヘリウムガスの濃度が少なくとも５０％以上
であることが好ましい。特に容器容量に対して３割程度
の空隙を有する紙容器に充填する場合には７ＫＰａ程度
の圧力が好ましく、これによって空隙部内のヘリウムガ
スの濃度が７０％程度に達する。
【００１５】紙容器にヘリウムガスを充填した後、紙容
器内のヘリウムガスの濃度の計測は、紙容器を水中にて
破壊して、密封性のあるプラスチック製の容器を用いて
水中で気体を捕集し、このプラスチック製の容器に捕集
された気体中のヘリウム濃度を測定する方法や、ヘリウ
ムガスが充填されている空隙部分に対応する紙容器の外
側面にゴム等を貼り付け、注射針をこの上から刺して紙
容器内の気体を吸引し、捕集した気体中のヘリウム濃度
を測定するなどといった方法により行われるが、これら
に限られるものではない。
【００１６】前記の測定方法による紙容器空隙部のヘリ
ウムガス濃度の経時的な計測は、同一条件で試作され、
ヘリウムガスを充填された紙容器を複数用意し、それぞ
れの紙容器における空隙部内のヘリウムガス濃度を、所
定の時間を違えて測定して行えばよい。
【００１７】上記のようにして行われる紙容器のバリア
性検査方法によれば、紙容器空隙部に充填したヘリウム
ガスは、分子量が小さく、紙容器から大気中にスムーズ
に抜けるため、従来の紙容器のバリア性検査に用いられ
てきた窒素ガスや酸素の紙容器透過時間に比べて遙かに
短い時間で紙容器を透過し、これにより紙容器のバリア
性検査時間の短縮化が図れ作業性が向上する。また、ヘ
リウムガスは大気中に殆ど存在しないので、バリア性の
良否によるヘリウムガス濃度の差が大きく出て、正確な
検査を可能にし、更には、紙容器成型時に発生する微小
なピンホールや紙容器シール部のシール特性の僅かな相
違等によるバリアの差も検出することができ、これらが
バリア性に及ぼす影響を容易に判定することができる。
特に封緘直後の紙容器空隙部内のヘリウムガスの濃度が
５０％以上であれば、バリア性の良否によるヘリウムガ
ス濃度の差がより大きく出て、一層正確・精密な検査を
可能にする。また、ヘリウムガスは不活性ガスなので安
全である。
【００１８】
【実施例】次に、本発明の実施例を図面に基づいて説明
する。
実施例１
板紙層１の両面に低密度ポリエチレン層２，３を配置し
た図１に示す積層構造の紙容器材料４で、容量１０５０
ｍｌのゲーブルトップ型の紙容器５を定法により成型
し、この紙容器５に５００ｍｌの水を充填し、図２に示
すようにして、空隙部７にノズル６から７ＫＰａの圧力
でヘリウムガスを吹き込んだ後、頂部シール開封部８を
頂部シールバー９を用い、３３０℃又は３５０℃でヒー
トシールして頂部を封緘した。このとき、紙容器５の空
隙部７に充填されたヘリウムガスの濃度の初期値は５０
％であった。
【００１９】得られた２種類の紙容器５について、紙容
器５の空隙部７にヘリウムガスを充填してから１２時間
後のヘリウムガスの濃度を測定したところ、３３０℃で
ヒートシールしたものは２％、３５０℃でヒートシール
したものは８％であった。この差異は、頂部シール開封
部８をシールするシール温度の違いによって生じる頂部
シール開封部８の接着力の差異により生じるものであ
り、シール温度の違いによって紙容器５のバリア性に差
異が生じることが検出できた。
【００２０】実施例２
板紙層１０の外面側に低密度ポリエチレン層１１を配置
し、内面側に低密度ポリエチレン層１２、アルミ箔層１
３、低密度ポリエチレン層１４を配置した図３に示す積
層構造の紙容器材料１５で、容量１０５０ｍｌのゲーブ
ルトップ型の紙容器を、頂部シール開封部に施される抗
接着剤の面積が異なる３種類の紙容器Ａ，Ｂ，Ｃ（図示
せず）として試作し、この紙容器Ａ，Ｂ，Ｃに８００ｍ
ｌの水を充填し、実施例１と同様にして、それぞれの紙
容器Ａ，Ｂ，Ｃの空隙部に７ＫＰａの圧力でヘリウムガ
スを吹き込んだ後、頂部シール開封部を頂部シールバー
でヒートシールして頂部を封緘した。このときの紙容器
Ａ，Ｂ，Ｃの空隙部に充填されたヘリウムガスの濃度の
初期値は７５％であった。
【００２１】この３種類の紙容器Ａ，Ｂ，Ｃについて、
空隙部にヘリウムガスを充填してから３日後のヘリウム
ガスの濃度を測定したところ、紙容器Ａは２８％、紙容
器Ｂは４５％、紙容器Ｃは６０％であった。この差異
は、頂部シール開封部に施された抗接着剤の面積の違い
によって生じる頂部シール開封部の接着性の差異により
生じるものであり、頂部シール開封部に施された抗接着
剤の面積の違いによって紙容器のバリア性に差異が生じ
ることが検出できた。
【００２２】比較例１
実施例２で使用された、板紙層１０の外面側に低密度ポ
リエチレン層１１を配置し、内面側に低密度ポリエチレ
ン層１２、アルミ箔層１３、低密度ポリエチレン層１４
を配置した積層構造の紙容器材料１５で試作された、容
量１０５０ｍｌのゲーブルトップ型で、頂部シール開封
部に施される抗接着剤の面積が異なる３種類の紙容器
Ａ，Ｂ，Ｃに１０００ｍｌの水を充填し、実施例１と同
様にして、それぞれの紙容器Ａ，Ｂ，Ｃの空隙部に７Ｋ
Ｐａの圧力で窒素ガスを吹き込んだ後、頂部シール開封
部をヒートシールして頂部を封緘した。このときの紙容
器Ａ，Ｂ，Ｃの空隙部における酸素濃度の初期値は９．
５％であった。
【００２３】この３種類の紙容器Ａ，Ｂ，Ｃについて、
空隙部に窒素ガスを充填してから３日後の酸素濃度を測
定したところ、紙容器Ａは１３％、紙容器Ｂは１２％、
紙容器Ｃは１２％、一週間後の酸素濃度を測定したとこ
ろ、紙容器Ａは１５％、紙容器Ｂは１４％、紙容器Ｃは
１２％、更に三週間後の酸素濃度を測定したところ、紙
容器Ａは１７％、紙容器Ｂは１６％、紙容器Ｃは１６％
であった。このように紙容器空隙部内の酸素濃度の差異
は検出できるものの、ヘリウムと比較すると小さな数値
変化に留まり、トップシールパネルに施される抗接着剤
の面積の違いによって生じる紙容器のバリア性の微妙な
差異が検出し難いものであった。
【００２４】比較例２
実施例１で使用された、板紙層１の両面に低密度ポリエ
チレン層２，３を配置した積層構造の紙容器材料４で成
型された、容量１０５０ｍｌのゲーブルトップ型の紙容
器に８００ｍｌの水を充填し、その空隙部に５ＫＰａの
圧力で窒素ガスを吹き込んだ後、実施例１と同様にし
て、頂部シール開封部を３３０℃又は３５０℃でヒート
シールして頂部を封緘した。このときの紙容器の空隙部
における酸素濃度の初期値は１１％であった。
【００２５】得られた２種類の紙容器について、空隙部
に窒素ガスを充填してから１２時間後の酸素濃度を測定
したところ、３３０℃でヒートシールしたものは１７
％、３５０℃でヒートシールしたものも１７％であっ
た。このように紙容器空隙部内の酸素の濃度に差異は発
生せず、トップシールパネルをヒートシールする際のシ
ール温度の違いによる紙容器のバリア性の微妙な違い
は、少なくとも１２時間の放置では検出できなかった。
【００２６】
【発明の効果】以上のように本発明に係る紙容器のバリ
ア性検査方法によれば、紙容器空隙部にヘリウムガスを
充填して封緘し、封緘後、紙容器空隙部のヘリウムガス
濃度を経時的に計測し、ヘリウムガス濃度の減少を指標
として紙容器のバリア性を検査する。紙容器空隙部に充
填したヘリウムガスは、分子量が小さく、紙容器から大
気中にスムーズに抜けるため、紙容器のバリア性検査時
間の短縮化が図れ作業性が向上し、また、ヘリウムガス
は大気中に殆ど存在しないので、バリア性の良否による
ヘリウムガス濃度の差が大きく出て、正確な検査を可能
にし、更には、紙容器成型時に発生する微小なピンホー
ルや紙容器シール部のシール特性の僅かな相違等による
バリアの差も検出することができ、これらがバリア性に
及ぼす影響を容易に判定することができ、また、ヘリウ
ムガスは不活性ガスなので安全であるといった効果があ
る。Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method for inspecting barrier properties of a paper container used in a sealed state. 2. Description of the Related Art Paper containers are often used as containers for storing liquids. If the contents are juice, sake, soy sauce, etc., which deteriorate when exposed to oxygen, the contents can be stored for a long time. In order to achieve this, a means is employed in which a gap is filled with a nitrogen gas in the space of a paper container in which the contents are accommodated and sealed, for example, in a gobel-top type paper container, and gas is replaced. [0003] However, even if the gas exchange is performed by filling the gap of the paper container with the contents and sealing it with nitrogen gas, if the gas barrier property of the paper container is not sufficient, the nitrogen filled in the gap of the paper container is not sufficient. While gas passes through the paper container and leaks to the atmosphere, oxygen in the atmosphere enters this void, and nitrogen gas and oxygen are replaced with time, making it impossible to preserve the contents for a long time. There are cases. This is due to the barrier properties of the container material itself, the presence of minute pinholes generated during the molding of the paper container, the sealing characteristics of the paper container seal, the area and shape of the anti-adhesive applied to the paper container opening. . [0004] Therefore, in order to obtain a paper container having a barrier property required for long-term storage of contents, a container material having a barrier property, an anti-adhesive applied to the heat sealing temperature of the seal portion of the paper container and / or an opening portion are provided. Various areas and shapes were studied,
In selecting and deciding these, inspections are being conducted to determine the effects of these on the barrier properties of the paper container. Conventionally, as a method for testing the barrier properties of a paper container, a paper container in which a void portion of the paper container is filled with nitrogen gas and sealed is used.
The measurement was performed by measuring the oxygen concentration of the void over time and calculating the rate of increase in the oxygen concentration. However, in the above-described method for inspecting the barrier property of a paper container, the nitrogen gas in the void portion of the paper container is replaced with oxygen in the atmosphere, and enters the paper container. From the viewpoint of measuring the oxygen concentration, there are the following problems. [0006] Since both nitrogen and oxygen to be replaced have a large molecular weight, even if nitrogen gas escapes from the paper container to the atmosphere, or oxygen enters the paper container from the atmosphere,
It takes some time and the workability is poor. Further, both nitrogen and oxygen to be replaced exist in the atmosphere, and particularly, nitrogen accounts for about 80% in the atmosphere. On the other hand, oxygen is also dissolved in the contents of the paper container, and when the oxygen concentration of the paper container is low, it is considered that part of the dissolved oxygen is vaporized and moves to the void. Therefore, the difference in oxygen concentration depending on the quality of the barrier property is not so large, and the accuracy is poor. Therefore, it is difficult to detect barrier differences due to minute pinholes generated during the molding of the paper container and slight differences in the sealing characteristics of the paper container sealing portion, and it is difficult to determine the effects of these on the barrier properties. Can not. An object of the present invention is to provide a method for inspecting the barrier property of a paper container, which can inspect the barrier property of the paper container in a short time, accurately and precisely. [0008] In order to achieve the above object, a method for testing the barrier properties of a paper container according to the present invention comprises filling a void in a paper container with helium gas, sealing the space, and then sealing the space. The method is characterized in that the helium gas concentration (replacement ratio) in the space of the paper container is measured with time, and the barrier property of the paper container is inspected using the helium gas concentration as an index. [0009] With this configuration, the helium gas filled in the space of the paper container has a small molecular weight and smoothly escapes from the paper container to the atmosphere, so that the inspection can be performed in a short time and the workability thereof is improved. Also, since helium gas hardly exists in the atmosphere, a large difference in helium gas concentration depending on the quality of the barrier comes out, enabling accurate inspection. Barrier differences due to slight differences in the sealing properties of the paper container seals can also be detected, and the effect of these on the barrier properties can be easily determined. Helium gas is safe because it is an inert gas. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for inspecting the barrier property of a paper container according to the present invention will be described below. In the present invention, first, helium gas is blown into the gap immediately before the sealing of the paper container, and the air in the gap of the paper container is replaced with helium gas for sealing. After the paper container is sealed in this manner, the concentration of the helium gas filled in the gap is measured without leaving a space as much as possible, and recorded as the initial value of the helium gas concentration. Thereafter, after a lapse of a predetermined time, the helium gas is created under the same conditions, and the helium gas concentration in the void portion of the paper container filled with the helium gas is also measured under the same conditions, and the helium gas concentration relative to the initial value of the helium gas concentration is measured. With the decrease in helium gas concentration after a predetermined time as an index,
Determine the barrier properties of the paper container. As described above, helium gas is blown immediately before the paper container is sealed, and the helium gas concentration in the gap immediately after the sealing is set to the initial value of the helium gas concentration. Since the initial value of the helium gas concentration varies, it is necessary to verify the filling pressure of the helium gas as preparation. That is, since the molecular weight of helium itself is small, when the space is filled with helium gas, the space is not filled with helium gas unless the pressure is higher than the conventional filling pressure of nitrogen gas. For example, when the paper container is a goebel top type, and when the top space is filled with helium gas, the pressure is set to at least 3 KPa.
If not, the initial value of the concentration of helium gas in the gap, that is, the replacement ratio of helium gas and air may be 40% or less, and such a concentration is not necessarily suitable for the examination of the barrier property of a paper container. Not really. In the examination of the barrier property of the paper container, it is preferable that the concentration of the helium gas filled in the gap is at least 50% or more. In particular, when filling a paper container having a gap of about 30% of the container capacity, a pressure of about 7 KPa is preferable, whereby the concentration of helium gas in the gap reaches about 70%. After filling the paper container with helium gas, the concentration of helium gas in the paper container is measured by destroying the paper container in water and using a hermetically sealed plastic container to release the gas in water. The method of collecting and measuring the helium concentration in the gas collected in this plastic container, or attaching rubber or the like to the outer surface of a paper container corresponding to the space filled with helium gas and injecting The method is performed by, for example, piercing a needle from above, sucking the gas in the paper container, and measuring the helium concentration in the collected gas, but is not limited thereto. The time-dependent measurement of the helium gas concentration in the void portion of the paper container by the above-described measuring method is performed under the same conditions as a trial production.
A plurality of paper containers filled with helium gas may be prepared, and the helium gas concentration in the voids in each paper container may be measured by changing the predetermined time. According to the method for inspecting the barrier property of a paper container performed as described above, the helium gas filled in the void portion of the paper container has a small molecular weight and smoothly escapes from the paper container to the atmosphere. Nitrogen gas and oxygen permeate the paper container in a much shorter time than the paper container permeation time that has been used for the barrier test of the container, thereby shortening the time required for the paper container barrier test. Is improved. In addition, since helium gas hardly exists in the atmosphere, a large difference in helium gas concentration depending on the quality of the barrier property appears, enabling accurate inspection. Barrier differences due to slight differences in the sealing characteristics of the container seal portion can also be detected, and the effects of these on the barrier properties can be easily determined.
In particular, if the concentration of helium gas in the void portion of the paper container immediately after sealing is 50% or more, the difference in helium gas concentration depending on the quality of the barrier property is greater, and more accurate and precise inspection is possible. Helium gas is safe because it is an inert gas. Next, an embodiment of the present invention will be described with reference to the drawings. Example 1 A paper container material 4 having a laminated structure shown in FIG. 1 in which low-density polyethylene layers 2 and 3 are arranged on both sides of a paperboard layer 1 and having a capacity of 1050
The gable-top type paper container 5 of 5 ml is molded by a conventional method, and the paper container 5 is filled with 500 ml of water, and helium gas is blown into the gap 7 from the nozzle 6 at a pressure of 7 KPa as shown in FIG. Thereafter, the top seal opening portion 8 was heat-sealed at 330 ° C. or 350 ° C. using the top seal bar 9 to seal the top. At this time, the initial value of the concentration of the helium gas filled in the gap 7 of the paper container 5 is 50
%Met. With respect to the two types of paper containers 5 obtained, the helium gas concentration was measured 12 hours after filling the space 7 of the paper container 5 with helium gas. Heat-sealed at 2% and 350 ° C. was 8%. This difference is caused by the difference in the adhesive force of the top seal opening portion 8 caused by the difference in the sealing temperature for sealing the top seal opening portion 8, and the difference in the barrier property of the paper container 5 due to the difference in the sealing temperature. Was detected. Example 2 A low-density polyethylene layer 11 is disposed on the outer surface of a paperboard layer 10, and a low-density polyethylene layer 12 and an aluminum foil layer 1 are disposed on an inner surface.
3. A paper container material 15 having a laminated structure shown in FIG. 3 in which the low-density polyethylene layer 14 is disposed, and a gable-top type paper container having a capacity of 1050 ml is different in the area of the anti-adhesive applied to the opening portion of the top seal. Prototypes of paper containers A, B, and C (not shown) were made as prototypes.
After filling helium gas at a pressure of 7 KPa into the gaps of the paper containers A, B and C in the same manner as in Example 1, the top seal opening portion is heat-sealed with a top seal bar. Then the top was sealed. At this time, the initial value of the concentration of helium gas filled in the voids of the paper containers A, B, and C was 75%. For these three types of paper containers A, B and C,
The helium gas concentration measured three days after filling the helium gas into the voids was 28% for paper container A, 45% for paper container B, and 60% for paper container C. This difference is caused by the difference in the adhesiveness of the top seal opening part caused by the difference in the area of the anti-adhesive applied to the top seal opening part, and the difference in the area of the anti-adhesive applied to the top seal opening part. It was detected that the difference caused the difference in the barrier property of the paper container. Comparative Example 1 A low-density polyethylene layer 11 was disposed on the outer surface of the paperboard layer 10 used in Example 2, and a low-density polyethylene layer 12, an aluminum foil layer 13, and a low-density polyethylene layer 14 were disposed on the inner surface.
The three types of paper containers A, B, and C, each of which is a gable-top type having a capacity of 1050 ml and different in the area of the anti-adhesive applied to the top seal opening portion, which are prototyped with the paper container material 15 having a laminated structure in which , And 7K is filled in the gaps of the paper containers A, B, and C in the same manner as in Example 1.
After blowing nitrogen gas at a pressure of Pa, the top seal opening was heat-sealed to seal the top. At this time, the initial value of the oxygen concentration in the voids of the paper containers A, B, and C is 9.
5%. For these three types of paper containers A, B, and C,
When the oxygen concentration was measured three days after filling the void with nitrogen gas, the paper container A was 13%, the paper container B was 12%,
Paper container C measured 12% and oxygen concentration after one week. Paper container A measured 15%, paper container B measured 14%, paper container C measured 12% and oxygen concentration measured after three weeks. , Paper container A 17%, paper container B 16%, paper container C 16%
Met. In this way, the difference in oxygen concentration in the voids in the paper container can be detected, but only a small numerical change compared to helium, and the subtle barrier properties of the paper container caused by the difference in the area of the anti-adhesive applied to the top seal panel Differences were difficult to detect. Comparative Example 2 A gable-top type paper having a capacity of 1050 ml, which was molded from a laminated paper container material 4 having low-density polyethylene layers 2 and 3 disposed on both sides of a paperboard layer 1 used in Example 1. After filling the container with 800 ml of water and blowing nitrogen gas into the gap at a pressure of 5 KPa, the top seal opening portion is heat-sealed at 330 ° C. or 350 ° C. to seal the top portion in the same manner as in Example 1. did. At this time, the initial value of the oxygen concentration in the void portion of the paper container was 11%. The oxygen concentration of the two types of paper containers obtained 12 hours after the filling of the voids with nitrogen gas was measured.
%, And 17% were heat-sealed at 350 ° C. As described above, there is no difference in the oxygen concentration in the gap of the paper container, and the delicate difference in the barrier property of the paper container due to the difference in the sealing temperature when heat sealing the top seal panel is detected at least for 12 hours. could not. As described above, according to the method for inspecting the barrier property of a paper container according to the present invention, the space of the paper container is filled with helium gas and sealed, and after sealing, the helium in the space of the paper container is sealed. The gas concentration is measured over time, and the barrier property of the paper container is inspected using the decrease in the helium gas concentration as an index. The helium gas filled in the voids of the paper container has a low molecular weight and smoothly escapes from the paper container to the atmosphere, so that the time required for testing the barrier properties of the paper container can be shortened, and the workability can be improved. Since there is almost no presence in the helium gas, the difference in helium gas concentration due to the quality of the barrier is large, enabling accurate inspection. In addition, small pinholes generated during paper container molding and the sealing characteristics of the paper container seal part It is also possible to detect a difference in barrier due to a slight difference between the two, and easily determine the influence of these on the barrier properties. In addition, there is an effect that helium gas is safe because it is an inert gas.
【図面の簡単な説明】
【図１】本発明に係る紙容器のバリア性検査方法の実施
例で使用される紙容器材料の一例を示す断面図。
【図２】本発明に係る紙容器のバリア性検査方法の実施
例で、紙容器内にヘリウムガスを吹き込む工程を示す説
明図。
【図３】本発明に係る紙容器のバリア性検査方法の他の
実施例で使用される紙容器材料の一例を示す断面図。
【符号の説明】
１ 板紙層
２ 低密度ポリエチレン層
３ 低密度ポリエチレン層
４ 紙容器材料
５ 紙容器
６ ノズル
７ 空隙部
８ 頂部シール開封部
９ 頂部シールバー
１０ 板紙層
１１ 低密度ポリエチレン層
１２ 低密度ポリエチレン層
１３ アルミ箔層
１４ 低密度ポリエチレン層
１５ 紙容器材料BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an example of a paper container material used in an embodiment of the paper container barrier property inspection method according to the present invention. FIG. 2 is an explanatory view showing a step of blowing helium gas into the paper container in the embodiment of the paper container barrier property inspection method according to the present invention. FIG. 3 is a sectional view showing an example of a paper container material used in another embodiment of the paper container barrier property inspection method according to the present invention. [Description of Signs] 1 Paperboard layer 2 Low-density polyethylene layer 3 Low-density polyethylene layer 4 Paper container material 5 Paper container 6 Nozzle 7 Void portion 8 Top seal opening section 9 Top seal bar 10 Paperboard layer 11 Low-density polyethylene layer 12 Low-density Polyethylene layer 13 Aluminum foil layer 14 Low density polyethylene layer 15 Paper container material
Claims (1)
封緘し、封緘後、紙容器空隙部のヘリウムガス濃度を経
時的に計測し、ヘリウムガス濃度を指標として紙容器の
バリア性を検査することを特徴とする紙容器のバリア性
検査方法。Claims: 1. A space in a paper container is filled with helium gas and sealed, and after sealing, the helium gas concentration in the space in the paper container is measured over time, and the helium gas concentration is used as an index for paper. A method for inspecting the barrier property of a paper container, comprising inspecting the barrier property of the container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001369922A JP3773837B2 (en) | 2001-12-04 | 2001-12-04 | Barrier property inspection method for paper containers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001369922A JP3773837B2 (en) | 2001-12-04 | 2001-12-04 | Barrier property inspection method for paper containers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003166895A true JP2003166895A (en) | 2003-06-13 |
| JP3773837B2 JP3773837B2 (en) | 2006-05-10 |
Family
ID=19179235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001369922A Expired - Fee Related JP3773837B2 (en) | 2001-12-04 | 2001-12-04 | Barrier property inspection method for paper containers |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3773837B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017202087A1 (en) * | 2016-05-26 | 2017-11-30 | 青岛海尔股份有限公司 | Airtightness check method for refrigeration and freezing device, and refrigeration and freezing device |
| JP2019178965A (en) * | 2018-03-30 | 2019-10-17 | 凸版印刷株式会社 | Method for evaluating paper container with oxygen barrier property and paper container with oxygen barrier property |
-
2001
- 2001-12-04 JP JP2001369922A patent/JP3773837B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017202087A1 (en) * | 2016-05-26 | 2017-11-30 | 青岛海尔股份有限公司 | Airtightness check method for refrigeration and freezing device, and refrigeration and freezing device |
| JP2019178965A (en) * | 2018-03-30 | 2019-10-17 | 凸版印刷株式会社 | Method for evaluating paper container with oxygen barrier property and paper container with oxygen barrier property |
| JP7180100B2 (en) | 2018-03-30 | 2022-11-30 | 凸版印刷株式会社 | Oxygen-barrier paper container evaluation method and oxygen-barrier paper container |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3773837B2 (en) | 2006-05-10 |
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