JP3816033B2

JP3816033B2 - Paper container

Info

Publication number: JP3816033B2
Application number: JP2002198944A
Authority: JP
Inventors: 淳弘大塚; 尚浩吉良; 良仁松田; 井上　　徹; 尚浩西澤; 典一濱田; 正人福岡
Original assignee: House Foods Corp; Dai Nippon Printing Co Ltd
Current assignee: House Foods Corp; Dai Nippon Printing Co Ltd
Priority date: 2002-02-01
Filing date: 2002-07-08
Publication date: 2006-08-30
Anticipated expiration: 2022-07-08
Also published as: JP2003291942A

Description

【０００１】
【発明の属する技術分野】
本発明は、アルミニウム箔を層構成中に用いた密封性に優れた紙容器に関し、さらに詳しくは、環境温度の変化で紙容器内部が減圧状態になり、紙容器の胴部に凹みが生じる現象を防止することができる内容物の保存性に優れた紙容器に関する。
【０００２】
【従来の技術】
従来、遮光性あるいは酸素や水蒸気ガスバリアー性等に優れた密封性紙容器にスナック食品等を収容したカップ入り食品が広く市販されている。この理由としては、カップ入り食品は容器が保形性を有しており、袋入り食品に比べて内容物が外力により損傷することがなく、商品陳列棚に立てた状態で陳列することができるために場所を取ることがなく、また、見栄えもよくて訴求効果があり、さらに取扱いが容易であるなどのためである。
【０００３】
しかしながら、この種の密封性に優れた紙容器にスナック食品等が収容されたカップ入り食品は、スナック食品等が充填される環境温度に比べて流通段階等の環境温度が低い場合に、紙容器が余りに密封性に優れるために紙容器内が減圧された状態となり、表面積の大きいカップの胴部に凹みが発生して商品の外観を損なうという問題があり、この解決が要望されていた。
【０００４】
【発明が解決しようとする課題】
そこで本発明は、上記問題に鑑みてなされたものであり、その目的とするところは、環境温度が変化してもカップの胴部に凹みを生じることがない紙容器を提供することにある。
【０００５】
【課題を解決するための手段】
本発明者等は、上記目的を達成するために、請求項１記載の本発明の紙容器は、略扇形状の胴材の一方の端部を外方に折返して接着した折返し接着部に他方の端部を重ね合わせて接合して胴部を形成し、該胴部の下端部に底材を接合すると共に上端部を外方にカールして口縁部を形成した容器本体の前記口縁部を蓋材で密封した胴材、底材、蓋材が紙層、アルミニウム箔、熱接着性樹脂層を順に積層した積層シートから構成される紙容器において、内面となる前記熱接着性樹脂層から前記紙層の一部に達する透湿度が１．０ｇ／ｍ^２・２４ｈｒ（＝１．０ｇ／ｍ^２・day）以下の微細な通気孔を設けたことを特徴とするものである。このように構成することにより、環境温度が変化しても外気が紙層を通って通気孔から紙容器内部に流入するために胴部に凹みを生じることがなく、また、通気孔が貫通孔でないために通気孔から異物や塵埃が侵入することがない。さらに、湿気の影響を受けることなく一定期間内容物を保護することができる。なお、上記透湿度はＪＩＳＺ０２０８に準じて測定した数値である。
【０００６】
また、請求項２記載の本発明は、請求項１記載の紙容器において、前記通気孔が前記折返し接着部に設けられていることを特徴とするものである。このように構成することにより、たとえば、内容物が油分を含む食品の場合に油分が通気孔から紙層に染み出しても、染み出した個所が折返し接着部であるために商品の外観を損なうことがない。
【０００７】
また、請求項３記載の本発明は、請求項１、２のいずれかに記載の紙容器において、前記通気孔の径が０．０５ｍｍ以上０．４ｍｍ以下であることを特徴としている。このように構成することにより、機械的に加工することができるために、孔の形成が容易である。また、０．０５ｍｍφより小さい孔の場合に、たとえば、油分等で孔が塞がれて胴部に凹みを生じることがあるが、これを排除することができ、また、０．４ｍｍφより大きい孔の場合に、たとえば、水分等が浸透することがあるが、これを排除することができる。
【０００８】
【発明の実施の形態】
上記の本発明について、図面等を用いて以下に詳述する。
図１は本発明にかかる紙容器の一実施例を示す斜視図、図２は図１に示す紙容器に用いる（ａ）は胴材の展開図，（ｂ）は底材の展開図、図３は図１のＸ−Ｘ線断面図、図４は図１のＹ−Ｙ線断面図、図５は胴材の通気孔を設ける領域を示す平面図、図６は胴材に設ける通気孔の設け方を説明する断面図であり、図中の１は紙容器、２は容器本体、２０は胴部、２１は口縁部、３０は底部、２０１は胴材、３０１は底材、４０１は蓋材、２０１１は熱接着性樹脂層、２０１２はアルミニウム箔、２０１３は紙層、Ｓは折返し接着部、Ｒ_１，Ｒ_２は通気孔を設ける領域をそれぞれ示す。
【０００９】
図１は本発明にかかる紙容器の一実施例を示す斜視図、図２は図１に示す紙容器に用いる（ａ）は胴材の展開図，（ｂ）は底材の展開図、図３は図１のＸ−Ｘ線断面図、図４は図１のＹ−Ｙ線断面図であって、紙容器１は略扇形状の胴材２０１の一方の端部（図２上、右側の端部）を一点鎖線で示す位置Ｐで外方に折返し、折返した端部を前記胴材２０１に接着剤で接着（図３上、×印で表示）して折返し接着部Ｓとなすと共に該折返し接着部Ｓに他方の端部（図２上、左側の端部）を重ね合わせて接合（図３上、×印で表示）して胴部２０を形成し、該胴部２０の下端部内面に略円形状の底材３０１を外周縁部を下向きに起立させて前記外周縁部の内面を接合（図４上、×印で表示）すると共に前記外周縁部を覆うように前記胴部２０の下端縁部を内方に折り曲げて前記底材３０１の外周縁部の外面に接合（図４上、×印で表示）して底部３０を形成し、前記胴部２０の上端部を外方にカールして口縁部２１を形成した容器本体２の前記口縁部２１を周縁に摘まみ部を有する前記口縁部２１と略同じ外形の蓋材４０１で熱接着して密封したものである。なお、接合の意味は、前記胴材２０１、前記底材３０１、前記蓋材４０１の層構成について後述するが、各材を構成する熱接着性樹脂層で熱接着することである。
【００１０】
前記胴材２０１、前記底材３０１、前記蓋材４０１は、紙層の坪量や熱接着性樹脂層の樹脂種が異なるものの、いずれも紙層、アルミニウム箔、熱接着性樹脂層を順に積層した積層シートから構成される。具体的に各材の層構成を例示するならば、前記胴材２０１としてはカップ原紙２５０〜２９０ｇ/ｍ^２／低密度ポリエチレン１５μｍ／アルミニウム箔７μｍ／低密度ポリエチレン４０μｍを挙げることができ、前記底材３０１としてはカップ原紙１６０〜２２０ｇ/ｍ^２／低密度ポリエチレン１５μｍ／アルミニウム箔７μｍ／低密度ポリエチレン４０μｍを挙げることができ、また、前記蓋材４０１としては片アート紙７９．１ｇ/ｍ^２／低密度ポリエチレン１５μｍ／アルミニウム箔７μｍ／低密度ポリエチレン２０μｍ／ホットメルト接着剤２０ｇ/ｍ^２を挙げることができるが、これに限定されるものではなく、要するに紙層、アルミニウム箔、熱接着性樹脂層を順に積層した積層シートから構成されるものは本発明にすべて含まれるものである。
【００１１】
図５は胴材の通気孔を設ける領域を示す平面図、図６は胴材に設ける通気孔の設け方を説明する断面図であって、本発明の紙容器１には、内面となる前記熱接着性樹脂層から前記紙層の一部に達する微細な通気孔Ｔが設けられている。この通気孔Ｔは底材３０１や蓋材４０１に設けることもできるが、胴材２０１を作製する際の打抜工程で打抜型に先端が鋭利な針状部材を取付けて、胴材２０１を型抜きすると同時に通気孔Ｔを設けるのが最も効率的である。また、通気孔Ｔを設ける位置としては、紙容器とした際の上部となる領域Ｒ_１、より好ましくは折返し接着部Ｓ（図３参照）の内面側となる領域Ｒ_２に内面となる熱接着性樹脂層２０１１からアルミニウム箔２０１２を貫通して紙層２０１３の一部に達するように設ける。
【００１２】
次に、上記の本発明を完成させるために行った試験について説明する。まず、試験に供する試験体（内容積が４２０ｃｍ^３のカップ状紙容器本体）を下記する胴材と底材とを用いてカップ成形機にて８種類作製した。
〔胴材〕カップ原紙２６５ｇ/ｍ^２／低密度ポリエチレン１５μｍ／アルミニウム箔７μｍ／低密度ポリエチレン４０μｍ
〔底材〕カップ原紙２２０ｇ/ｍ^２／低密度ポリエチレン１５μｍ／アルミニウム箔７μｍ／低密度ポリエチレン４０μｍ
〔蓋材〕片アート紙７９．１ｇ/ｍ^２／低密度ポリエチレン１５μｍ／アルミニウム箔７μｍ／低密度ポリエチレン２０μｍ／ホットメルト接着剤２０ｇ/ｍ^２
【００１３】
試験体１
通気孔を設けない胴材を用いた。
試験体２
０．０５ｍｍφの通気孔を１個設けた胴材を用いた。
試験体３
０．１ｍｍφの通気孔を１個設けた胴材を用いた。
試験体４
０．２ｍｍφの通気孔を１個設けた胴材を用いた。
試験体５
０．３ｍｍφの通気孔を１個設けた胴材を用いた。
試験体６
０．４ｍｍφの通気孔を１個設けた胴材を用いた。
試験体７
０．５ｍｍφの通気孔を１個設けた胴材を用いた。
試験体８
０．６ｍｍφの通気孔を１個設けた胴材を用いた。
試験体９
０．７ｍｍφの通気孔を１個設けた胴材を用いた。
試験体１０
０．８ｍｍφの通気孔を１個設けた胴材を用いた。
試験体１１
０．９ｍｍφの通気孔を１個設けた胴材を用いた。
試験体１２
１．０ｍｍφの通気孔を１個設けた胴材を用いた。
【００１４】
上記の１２種類の試験体（カップ状紙容器本体）を用いて、胴部の凹み評価及び透湿度と内容物の食味・食感の関係の評価を下記評価試験にて行い、その評価結果を表１に纏めて示した。
透湿度評価試験：シリカゲル２０ｇを各試験体内に入れて上記蓋材で密封し、４０℃・９０％ＲＨの環境下に１０日間放置した後シリカゲルを取り出しシリカゲルの重量を測定し、その重量変化量から1日当りの重量変化量を求めることにより紙容器の透湿度を測定した。測定値は各試験体とも１０個の最小値、最大値と平均値とで示した。単位はｍｇ／day・紙容器である。このようにして求めた透湿度ｘ（ｍｇ/ day・紙容器）を以下の換算式を用いて、ｇ/m²・day（＝ｇ／ｍ^２・２４ｈｒ）に換算した値ｙを示した。なお紙容器の表面積（蓋材を含む）は０．０３１６９m²である。
換算式：ｙ＝ｘ÷０．０３１６９（紙容器の表面積）÷１０００
食味・食感評価試験：スナック食品４５ｇを各試験体内に入れて上記蓋材で密封し、４０℃・９０％ＲＨの環境下に３ヶ月放置後に開封して、食味・食感を官能で評価した。評価基準としては食味・食感が落ちているものを×印で、良好なものを○印で示した。また、良好な中でも特に良好なものを◎印で示した。
胴部の凹み評価試験：２５℃の環境下で各試験体を上記蓋材で密封し、−２０℃環境下に１時間放置し、カップ状紙容器の凹みの有無を評価した。評価は各試験体とも１０個中の凹みが発生した個数を表示した。
水漏れ評価試験：水４２０ｃｃを各試験体内に入れて上記蓋材で密封し、常温下で６時間放置し、通気孔からの水漏れの有無を評価した。評価は各試験体とも１０個中の水漏れが発生した個数を表示した。
通気孔閉塞評価試験：２５℃の環境下で各試験体の通気孔に内面からサラダ油を塗布して後に上記蓋材で密封し、−２０℃環境下に１時間放置し、カップ状紙容器の凹みの有無を評価した。評価は各試験体とも１０個中の凹みが発生した個数を表示した。
【００１５】
【表１】

【００１６】
表１からも明らかなように、胴部の凹み評価および通気孔閉塞評価に対しては、０．０５ｍｍφ以上の大きさの通気孔を設けた試験体が良好であり、透湿度と食味・食感の関係では、０．９ｍｍφ(この通気孔の径は、表１中の試験体11に対応しており、その透湿度ｙは0.904であって、ほぼ1.0に近いと考えられる)以下の大きさの通気孔を設けた試験体が良好であり、その中でも特に０．４ｍｍφ以下の大きさの通気孔を設けた試験体が食味・食感共に極めて良好であった。また、水漏れに対しては０．４ｍｍφ以下の大きさの通気孔を設けた試験体が良好であった。以上の結果から、０．０５〜０．４ｍｍφの大きさの通気孔を設けた試験体が上記したいずれの評価においても良好な結果を示した。
【００１７】
【発明の効果】
今まで縷々説明してきたように、本発明によれば、略扇形状の胴材の一方の端部を外方に折返して接着した折返し接着部に他方の端部を重ね合わせて接合して胴部を形成し、該胴部の下端部に底材を接合すると共に上端部を外方にカールして口縁部を形成した容器本体の前記口縁部を蓋材で密封した胴材、底材、蓋材が紙層、アルミニウム箔、熱接着性樹脂層を順に積層した積層シートから構成される紙容器であって、該紙容器の内面、より好ましくは胴材の紙容器とした際の上部となる領域、さらに好ましくは胴材の折返し接着部の内面側となる領域に内面となる前記熱接着性樹脂層からアルミニウム箔を貫通して前記紙層の一部に達する透湿度が１．０ｇ／ｍ^２・２４ｈｒ以下の微細な通気孔を設けた紙容器とすることにより、環境温度が変化してもカップの胴部に凹みを生じることがなく、商品の外観を損なうことがない密封性に優れた紙容器を提供することができる。
【図面の簡単な説明】
【図１】本発明にかかる紙容器の一実施例を示す斜視図である。
【図２】図１に示す紙容器に用いる（ａ）は胴材の展開図，（ｂ）は底材の展開図である。
【図３】図１のＸ−Ｘ線断面図である。
【図４】図１のＹ−Ｙ線断面図である。
【図５】胴材の通気孔を設ける領域を示す平面図である。
【図６】胴材に設ける通気孔の設け方を説明する断面図である。
【符号の説明】
１紙容器
２容器本体
２０胴部
２１口縁部
３０底部
２０１胴材
３０１底材
４０１蓋材
２０１１熱接着性樹脂層
２０１２アルミニウム箔
２０１３紙層
Ｓ折返し接着部
Ｒ_１，Ｒ_２通気孔を設ける領域[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper container excellent in sealing performance using an aluminum foil in a layer structure, and more specifically, a phenomenon in which the inside of a paper container is in a reduced pressure state due to a change in environmental temperature, and a dent is formed in a body part of the paper container. It is related with the paper container excellent in the preservability of the contents which can prevent.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, cupped foods in which snack foods or the like are contained in a sealed paper container excellent in light shielding properties or oxygen and water vapor gas barrier properties have been widely marketed. The reason for this is that the food in the cup has a shape-retaining property, and the contents are not damaged by external force compared to the food in the bag, and can be displayed in a state standing on the product display shelf. This is because it does not take up space, has a good appearance, has an appealing effect, and is easy to handle.
[0003]
However, this kind of food in a cup in which snack foods and the like are contained in a paper container having excellent sealing properties is used when the environmental temperature at the distribution stage is lower than the environmental temperature at which the snack foods and the like are filled. However, since the inside of the paper container is depressurized due to its excellent sealing property, there is a problem in that the cup body having a large surface area is dented and the appearance of the product is impaired, and this solution has been desired.
[0004]
[Problems to be solved by the invention]
Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a paper container that does not cause a dent in the body of the cup even when the environmental temperature changes.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the inventors of the present invention have a paper container according to the first aspect of the present invention, in which the end of one end of the substantially fan-shaped body is folded outward and bonded to the other. The rim of the container body in which the end portions of the container body are overlapped and joined to form a body portion, a bottom material is joined to the lower end portion of the body portion, and the upper end portion is curled outward to form an rim portion. The heat-adhesive resin layer serving as the inner surface in a paper container composed of a laminated sheet in which a body, a bottom material, and a cover material are laminated with a paper layer, an aluminum foil, and a heat-adhesive resin layer in order To the part of the paper layer is provided with fine ventilation holes having a moisture permeability of 1.0 g / m ² · 24 hr (= 1.0 g / m ² · day) or less. With this configuration, even if the environmental temperature changes, the outside air flows into the paper container from the vent through the paper layer, so that there is no dent in the body portion. Therefore, foreign matter and dust do not enter from the vent hole. Furthermore, the contents can be protected for a certain period without being affected by moisture. The moisture permeability is a numerical value measured according to JISZ0208.
[0006]
According to a second aspect of the present invention, in the paper container according to the first aspect, the vent hole is provided in the folded adhesive portion. By configuring in this way, for example, in the case where the content is a food containing oil, even if the oil oozes out from the vent hole to the paper layer, the spilled portion is a folded adhesive portion, which impairs the appearance of the product. There is nothing.
[0007]
According to a third aspect of the present invention, in the paper container according to the first or second aspect, the diameter of the vent hole is 0.05 mm or more and 0.4 mm or less. By configuring in this way, the hole can be easily formed because it can be mechanically processed. In addition, in the case of a hole smaller than 0.05 mmφ, for example, the hole may be blocked by oil or the like and a dent may be formed in the body portion. This can be eliminated, and a hole larger than 0.4 mmφ In this case, for example, moisture or the like may permeate, but this can be eliminated.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The above-described present invention will be described in detail below with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of a paper container according to the present invention, FIG. 2 is a developed view of a trunk, and FIG. 2B is a developed view of a bottom material, FIG. 3 is a cross-sectional view taken along line XX in FIG. 1, FIG. 4 is a cross-sectional view taken along line Y-Y in FIG. 1, FIG. 5 is a plan view showing a region in which a vent hole is provided, and FIG. 1 is a paper container, 2 is a container body, 20 is a trunk, 21 is a rim, 21 is a lip, 30 is a bottom, 201 is a trunk, 301 is a bottom, 401 Denotes a cover material, 2011 denotes a heat-adhesive resin layer, 2012 denotes an aluminum foil, 2013 denotes a paper layer, S denotes a folded adhesive portion, and R ₁ and R ₂ denote regions where vent holes are provided.
[0009]
FIG. 1 is a perspective view showing an embodiment of a paper container according to the present invention, FIG. 2 is a developed view of a trunk, and FIG. 2B is a developed view of a bottom material, FIG. 3 is a cross-sectional view taken along the line XX of FIG. 1, and FIG. 4 is a cross-sectional view taken along the line Y-Y of FIG. 1. The paper container 1 has one end of a substantially fan-shaped body 201 (on the right side in FIG. And the folded end is bonded to the body 201 with an adhesive (indicated by x in FIG. 3) to form a folded bonded portion S. The other end portion (the left end portion in FIG. 2 and the left end portion) is overlapped and joined to the folded adhesive portion S to form the barrel portion 20 (indicated by a cross in FIG. 3), and the lower end of the barrel portion 20 is formed. A substantially circular bottom material 301 is erected on the inner surface of the outer peripheral portion so that the outer peripheral edge portion is faced downward, and the inner surface of the outer peripheral peripheral portion is joined (indicated by x in FIG. 4) and the outer peripheral portion is covered. Lower end of part 20 The bottom part 30 is bent inwardly and joined to the outer surface of the outer peripheral edge part of the bottom material 301 (indicated by x in FIG. 4) to form the bottom part 30, and the upper end part of the body part 20 is curled outward. The mouth edge 21 of the container body 2 in which the mouth edge 21 is formed is heat-bonded and sealed with a lid member 401 having substantially the same outer shape as the mouth edge 21 having a knob on the periphery. Note that the meaning of the bonding is to be described later with respect to the layer structure of the body member 201, the bottom member 301, and the lid member 401, and is to thermally bond with a heat-adhesive resin layer constituting each member.
[0010]
The body material 201, the bottom material 301, and the lid material 401 are different in the basis weight of the paper layer and the resin type of the heat-adhesive resin layer. It is comprised from the laminated sheet. Specifically, the body 201 may include cup base paper 250 to 290 g / m ² / low density polyethylene 15 μm / aluminum foil 7 μm / low density polyethylene 40 μm. Examples of the material 301 include 160 to 220 g / m ^{2 of} cup base paper / 15 μm of low density polyethylene / 7 μm of aluminum foil / 40 μm of low density polyethylene, and the cover material 401 includes 79.1 g / m ² / one piece of art paper. Examples include, but are not limited to, low density polyethylene 15 μm / aluminum foil 7 μm / low density polyethylene 20 μm / hot melt adhesive 20 g / m ^2. In short, a paper layer, an aluminum foil, a thermal adhesive resin layer All of those composed of laminated sheets laminated in order are included in the present invention. It is.
[0011]
FIG. 5 is a plan view showing a region in which the ventilation holes of the body are provided, and FIG. 6 is a cross-sectional view illustrating how to provide the ventilation holes in the body, and the paper container 1 of the present invention has the above-mentioned inner surface. Fine ventilation holes T reaching from the heat-adhesive resin layer to a part of the paper layer are provided. The vent hole T can be provided in the bottom member 301 or the lid member 401. In the punching process when the barrel 201 is manufactured, a needle-like member having a sharp tip is attached to the punching die, and the barrel 201 is molded. It is most efficient to provide a vent T at the same time as the removal. Further, as a position where the vent hole T is provided, thermal bonding which becomes an inner surface in a region R _{1 which} is an upper portion when a paper container is formed, more preferably, a region R ₂ which is an inner surface side of the folded bonding portion S (see FIG. 3). The resin layer 2011 is provided so as to penetrate the aluminum foil 2012 and reach a part of the paper layer 2013.
[0012]
Next, a test conducted for completing the present invention will be described. First, eight types of test bodies (a cup-shaped paper container main body having an internal volume of 420 cm ³ ) to be used for the test were prepared using a cup molding machine using the following body material and bottom material.
[Body] Cup base paper 265 g / m ² / low density polyethylene 15 μm / aluminum foil 7 μm / low density polyethylene 40 μm
[Bottom material] Cup base paper 220 g / m ² / low density polyethylene 15 μm / aluminum foil 7 μm / low density polyethylene 40 μm
[Cover Material] Single piece art paper 79.1 g / m ² / low density polyethylene 15 μm / aluminum foil 7 μm / low density polyethylene 20 μm / hot melt adhesive 20 g / m ²
[0013]
Specimen 1
A body member without a vent hole was used.
Specimen 2
The body provided with one 0.05 mmφ vent hole was used.
Specimen 3
A body member provided with one 0.1 mmφ vent hole was used.
Specimen 4
A body member provided with one 0.2 mmφ vent hole was used.
Specimen 5
A body member provided with one 0.3 mmφ vent hole was used.
Specimen 6
A body member provided with one 0.4 mmφ vent hole was used.
Specimen 7
The body provided with one 0.5 mmφ vent hole was used.
Specimen 8
A body provided with one 0.6 mmφ vent hole was used.
Specimen 9
The body provided with one 0.7 mmφ vent hole was used.
Specimen 10
A body member provided with one 0.8 mmφ vent hole was used.
Specimen 11
The body provided with one 0.9 mmφ vent hole was used.
Specimen 12
The body provided with one 1.0 mmφ vent hole was used.
[0014]
Using the above 12 types of test bodies (cup-shaped paper container main body), the dent evaluation of the torso and the evaluation of the relationship between the moisture permeability and the taste / texture of the contents were performed in the following evaluation test, and the evaluation results were These are summarized in Table 1.
Moisture permeability evaluation test: 20 g of silica gel is put in each test body and sealed with the above-mentioned cover material, left in an environment of 40 ° C. and 90% RH for 10 days, then the silica gel is taken out and the weight of the silica gel is measured. From the above, the moisture permeability of the paper container was measured by calculating the amount of weight change per day. The measured values were shown as 10 minimum values, maximum values and average values for each specimen. The unit is mg / day / paper container. The value y obtained by converting the moisture permeability x (mg / day · paper container) thus obtained into g / m ² · day (= g / m ² · 24 hr) using the following conversion formula is shown. The surface area of the paper container (including the lid material) is 0.03169 m ² .
Conversion formula: y = x ÷ 0.03169 (surface area of paper container) ÷ 1000
Taste / texture evaluation test: 45 g of snack food is put in each test body, sealed with the above-mentioned lid material, opened in a 40 ° C./90% RH environment for 3 months, and taste / texture is evaluated sensorily. did. As evaluation criteria, those with poor taste and texture were marked with ×, and those with good quality were marked with ○. Also, among the good ones, particularly good ones are indicated by ◎.
Cylinder dent evaluation test: Each test specimen was sealed with the above-mentioned lid material in an environment of 25 ° C., and allowed to stand in a −20 ° C. environment for 1 hour, and the presence or absence of a dent in the cup-shaped paper container was evaluated. In the evaluation, the number of dents out of 10 was displayed for each specimen.
Water leakage evaluation test: 420 cc of water was put in each test body, sealed with the lid material, and allowed to stand at room temperature for 6 hours to evaluate the presence or absence of water leakage from the vent. In the evaluation, the number of water leaks in 10 specimens was displayed for each specimen.
Vent blockage evaluation test: Salad oil was applied from the inner surface to the vent holes of each test specimen in an environment of 25 ° C., and then sealed with the above lid material, and left in an environment of −20 ° C. for 1 hour. The presence or absence of dents was evaluated. In the evaluation, the number of dents out of 10 was displayed for each specimen.
[0015]
[Table 1]

[0016]
As is clear from Table 1, for the dent evaluation of the trunk and the evaluation of the ventilation hole blockage, a test body provided with a ventilation hole having a size of 0.05 mmφ or more is good. In relation to feeling, 0.9 mmφ (the diameter of this vent corresponds to the specimen 11 in Table 1 and its moisture permeability y is 0.904, which is considered to be almost 1.0). The test body provided with the air vents was good, and among them, the test body provided with the air holes of 0.4 mmφ or less was particularly excellent in both taste and texture. Moreover, the test body which provided the ventilation hole of the magnitude | size below 0.4 mmphi with respect to the water leak was favorable. From the above results, the test body provided with a vent hole having a size of 0.05 to 0.4 mmφ showed good results in any of the above evaluations.
[0017]
【The invention's effect】
As has been frequently described so far, according to the present invention, the end of one of the substantially fan-shaped body members is folded back and bonded to the folded back bonded portion, and the other end is overlapped and joined. Forming a mouth portion, joining a bottom material to the lower end portion of the body portion and curling the upper end portion outward to form a mouth edge portion. A paper container composed of a laminated sheet in which a paper layer, an aluminum foil, and a heat-adhesive resin layer are laminated in this order as a material and a cover material, and more preferably when used as an inner surface of the paper container, more preferably a paper container for a trunk Moisture permeability that reaches a part of the paper layer through the aluminum foil from the thermoadhesive resin layer serving as the inner surface in the region serving as the upper part, more preferably the region serving as the inner surface side of the folded adhesive portion of the body material is 1. By making the paper container provided with fine ventilation holes of 0g / m ² · 24hr or less, the environmental temperature It is possible to provide a paper container excellent in hermeticity that does not cause dents in the body of the cup even if it changes, and does not impair the appearance of the product.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a paper container according to the present invention.
2A is a development view of a body material, and FIG. 2B is a development view of a bottom material used in the paper container shown in FIG. 1;
3 is a cross-sectional view taken along line XX of FIG.
4 is a cross-sectional view taken along line YY in FIG.
FIG. 5 is a plan view showing a region where a ventilation hole is provided in the body.
FIG. 6 is a cross-sectional view for explaining how to provide a vent hole provided in the body.
[Explanation of symbols]
1 Paper container 2 container body 20 the body portion 21 opening edge portion 30 bottom 201 body member 301 Bottom material 401 lid 2011 heat-adhesive resin layer 2012 aluminum foil 2013 a paper layer S folded adhesive part _R 1, _{R 2} region, a vent is provided

Claims

A body part is formed by overlapping and joining one end of a substantially fan-shaped body part to the folded adhesive part that is folded and bonded outward, and a bottom material is formed at the lower end part of the body part. The body of the container body that is joined and curled at the upper end outward to form the lip is sealed with a lid, the bottom material, and the cover are a paper layer, aluminum foil, and a thermal adhesive resin In a paper container composed of a laminated sheet in which layers are laminated in order, a fine ventilation hole having a moisture permeability of 1.0 g / m ² · 24 hr or less reaching from a part of the paper layer to the inner surface of the heat-adhesive resin layer A paper container characterized by comprising

The paper container according to claim 1, wherein the vent hole is provided in the folded adhesive portion.

The paper container according to claim 1 or 2, wherein the vent hole is a hole of 0.05 to 0.4 mmφ.