JP2004161324A - Heat insulation paper container and method for manufacturing the same - Google Patents

Heat insulation paper container and method for manufacturing the same Download PDF

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Publication number
JP2004161324A
JP2004161324A JP2002329240A JP2002329240A JP2004161324A JP 2004161324 A JP2004161324 A JP 2004161324A JP 2002329240 A JP2002329240 A JP 2002329240A JP 2002329240 A JP2002329240 A JP 2002329240A JP 2004161324 A JP2004161324 A JP 2004161324A
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Prior art keywords
paper
container
cup
layer
paper container
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JP2002329240A
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Japanese (ja)
Inventor
Eishin Miyake
英信 三宅
Minoru Nagae
実 永江
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Toppan Inc
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Toppan Printing Co Ltd
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Priority to JP2002329240A priority Critical patent/JP2004161324A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulation paper container and a manufacturing method therefor in which a cup original paper to constitute the paper container is affixed to a container having a blowing agent and a print ink layer to form the paper container (a paper cup), and a heat insulation layer of high heat insulation effect on a side surface of a barrel portion by the blowing agent is obtained by heating the paper container. <P>SOLUTION: The paper container is formed of a laminate paper with a surface of a paper cup original paper having a sealant layer on one side and a face side of a foaming paper having a blowing agent layer on a face of a base paper of woodfree paper and a print ink layer to constitute a pattern or the like in an area of the face of the blowing agent layer affixed to each other via adhesive. This paper container is placed in an oven or the like, and heated at the temperature of 130-170°C for about 30-60 seconds to form a heat insulation layer by the foaming agent on a side of a barrel portion of the container. The heat insulation paper container of high heat effect and strong container rigidity is obtained thereby. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、ホットコーヒー、熱いスープ等加熱された飲み物等を入れる紙容器において、熱い飲み物等の熱が容器の胴部を通じて熱く伝わらないようにすると共に、直接手に持っても火傷等起こさないように胴部に断熱層を設けた断熱紙容器及びその製造方法に関するものである。
【0002】
【従来の技術】
従来より、容器として一般的にカップ成型機で成型可能なテーパ紙容器(紙カップ)が知られている。これらの紙カップは冷たい飲み物等の場合は紙そのままでも良いが、熱い飲み物、例えばホットコーヒーや熱いスープ等を入れて直接手に持った場合、飲み物の熱が紙カップを通して手に伝わり、手や指が熱さを感じて落としてしまう等の問題があった。そこで紙カップの胴部に断熱処理を施した種々の紙容器が現在使用されている。
【0003】
例えば、図3に示すような一般的な紙容器(50)は、ポリエチレン層(PE)/カップ原紙/印刷インキ層/ポリエチレン層(PE)、或いはポリエチレン層/カップ原紙/ポリエチレン層/印刷インキ層からなる積層紙を用いて紙容器を成型し、加熱により印刷インキ層面側のポリエチレン層を発泡させて紙容器の胴部側面にポリエチレン層の発泡による断熱層を形成していた。
しかし、上記の紙容器における断熱性は低く、自販機等で使用した場合、暫く紙容器をさましてからでないと手に持つことができない場合があった。そこでさらに断熱性を有する紙容器として、図示はしないが、2層カップやエンボスした紙を紙容器に巻き付けたもの、或いは容器自体を2重にした容器等が提供されている。これらの容器においては、容器間に空間を形成する構造にして断熱性の効果を高めたものである。
【0004】
【発明が解決しようとする課題】
しかしながら、前者のポリエチレン層を発泡させた紙容器は、先に述べたように断熱性が低く、また、熱い飲み物等を注入することにより紙容器の剛性が損なわれる場合が見られた。また後者の空間を形成する紙容器においては、断熱性は前記の紙容器(紙カップ)よりは高くなっているが、構造上容器間に空間を維持することが難しく、製造する場合においても工程が複雑になり容易ではない。特に、熱い飲み物等を注入した場合に空間を維持する2層構造における剛性が問題となる。
【0005】
そこで本発明は、上記の問題を解決するためになされたもので、紙容器を構成するカップ原紙と発泡剤と印刷インキ層を設けた用紙を貼り合わせ、紙容器(紙カップ)を成型した後、加熱することで発泡剤により胴部側面に断熱効果の高い断熱層が得られるものであり、2枚の紙を積層し、かつ1枚の紙が発泡することで容器剛性が得られる断熱紙容器及びその製造方法を提供することを目的とするものである。
【0006】
【課題を解決するための手段】
上記目的を達成するために、本発明の断熱紙容器は、
一方の面にシーラント層を設けた紙カップ原紙と、上質紙等による紙基材表面に発泡剤層を設け、さらにこの発泡剤層面の領域に絵柄等を構成する印刷インキ層を設けてなる発泡紙との構成からなり、前記紙カップ原紙面と前記発泡紙の紙面側とを接着剤を介して貼り合わせた積層紙により紙容器を成型したことを特徴とするものである。
【0007】
また、請求項1記載の断熱紙容器においては、
前記紙容器の底蓋基材は、カップ原紙/シーラント層構成を特徴とするものである。
【0008】
また、請求項1または請求項2記載の断熱紙容器においては、
前記紙容器を加熱して発泡剤を発泡させることにより、容器の胴部側面に断熱層を設けたことを特徴とするものである。
【0009】
また、請求項1乃至請求項3記載の断熱紙容器においては、
前記紙容器の加熱は、130℃〜170℃の温度で、約30〜60秒間オーブン等にて加熱することを特徴とするものである。
【0010】
さらに、本発明の断熱紙容器の製造方法は、
原紙の片面にシーラント層をコーティングしてなるカップ原紙と、カプセル発泡剤を混合したコーティング剤を上質紙等の紙基材にコーティングし乾燥させた後、この上から絵柄用の印刷インキ層を施してなる発泡紙とからなり、前記カップ原紙面と前記発泡紙基材面とを接着剤を介して貼り合わせて積層紙を構成し、前記積層紙をカップサイドブランクスに打ち抜き、内面側にあたる紙端面をスカイブ加工すると共に、カップ原紙にシーラント層をコーティングした用紙を底蓋として、カツプ成型機により紙容器を成型した後、該紙容器をオーブン等により130℃〜170℃の温度で、約30〜60秒間加熱して容器の胴部側面に発泡剤による断熱層を付与したことを特徴とするものである。
【0011】
【発明の実施の形態】
本発明の断熱紙容器は、一方の面にシーラント層を設けた紙カップ原紙と、上質紙等による紙基材表面に発泡剤層を設け、この発泡剤層面の領域に絵柄等を構成する印刷インキ層を設けてなる発泡紙とからなり、前記紙カップ原紙面と前記発泡紙の紙面側とを接着剤を介して貼り合わせた積層紙により紙容器を成型したもので、この紙容器をオーブン等に入れ130℃〜170℃の温度で、約30〜60秒間加熱して容器の胴部側面に発泡剤による断熱層を付与したことを特徴とするものである。従って、発泡剤が紙基材の一部に含浸するため加熱することによりこの紙基材も発泡するので断熱効果が高い容器が得られる。また2枚の紙を積層しかつ1枚の紙が発泡する仕組みになっているので、この断熱紙容器は強い容器剛性を得ることができる。
【0012】
図に基づき本発明を使用際に説明する。
図1は、本発明の実施例における断熱紙容器の積層構成の一例を示す説明図である。また図2は、本発明の実施例における断熱紙容器の積層構成を示すもので、(A)はそのの側断面図であり、(B)は加熱によって発泡することによる状態を示す側面断面図である。
【0013】
【実施例】
本発明の断熱紙容器の構成は、図1に示すように、カプセル発泡剤を混合したコーティング剤(15)を紙基材(14)に塗布し乾燥させた後、この上に絵柄等に用いる印刷インキ層(16)を施し加飾効果を付与した発泡紙(20)を得る。さらに一方の面にシーラント層(11)を設けたカップ原紙(10)の紙面と前記発泡紙(20)の非印刷インキ層面とを接着剤を介して積層し、断熱紙容器用の積層紙(30)を得る。
【0014】
さらに、図2に基づき本発明を説明すると、この積層紙(30)をカップサイドブランクスに打ち抜き、内面側に当たる紙端面をスカイブ加工する。また、底部用に用いる原紙は、カップ原紙にシーラント層を設けた用紙を底蓋用に準備する。以上の材料によりカップ成型機により紙容器を成型する。
【0015】
次に、図2(B)に示すように、成型した紙容器を130℃〜170℃の加熱されたオーブンに約30秒〜60秒間放置することにより、コーティング剤(15)の発泡剤が発泡してカップ胴部側面に空間を持った凹凸を形成し、断熱性を保有した断熱紙容器を得ることができた。
【0016】
上記に用いた素材は、カップ原紙(10)として100〜250g/m相当のカップ原紙であり、シーラント樹脂層(11)としてポリエチレン、ポリプロピレン、ポリエステル等の熱可塑性の樹脂を使用することができる。また、発泡紙の紙基材(14)は30〜300g/mの板紙(ノーサイズ原紙)、或いは0.70〜0.90g/ccの上質紙を選択することができる。カプセル発泡剤を混合したコーティング剤(15)はカプセル型の発泡剤(アクリル樹脂等)をTm:60〜140℃のバインダー樹脂のエマルジョン液に混合したもので、カプセル径は5〜60μm程度であり、この発泡倍率は2〜20倍程度である。さらに、印刷インキ(16)は、好ましくは発泡剤バインダーと同材、若しくは相溶性の良い樹脂をインキバインダーとしたものが良い。なお印刷前にアンカーコート剤を発泡剤コート面に塗布しても良い。
【0017】
この断熱紙容器の製造方法は、原紙の片面にポリエチレン樹脂等によるシーラント層(11)をコーティングしてなる100〜250g/m相当のカップ原紙(10)と、カプセル発泡剤を混合したバインダー樹脂のエマルジョン液のコーティング剤(14)を上質紙等の紙基材(14)にグラビア、スクリーン、ロールコーター等のいずれかによりコーティングし乾燥させた後、この上から絵柄用の印刷インキ層(16)を施してなる発泡紙(20)とからなる。前記カップ原紙面と前記発泡紙基材面とをポリエチレン等の接着剤を介して貼り合わせて積層紙(30)を構成したもので、このラミネート方法は、ドライラミ、ウエットラミ、ノンソル、エクストルーダーサンド等いずれかを適宜選択することができる。この前記積層紙(30)をカップサイドブランクスに打ち抜き、内面側にあたる紙端面をスカイブ加工すると共に、カップ原紙にシーラント層をコーティングした底部用の原紙による底蓋を用いて紙容器を成型する。この際の底蓋のシール方法は、ホットエアー、高周波、超音波等から選択することができる。この成型された紙容器をオーブン等に入れ130℃〜170℃の温度で、約30〜60秒間加熱することで、容器の胴部側面に発泡倍率2〜20倍程度の発泡剤による断熱層を付与することができる。
【0018】
上記の素材を用いて得られた断熱紙容器と、従来の断熱紙容器と異なる点は、発泡剤が発泡するコート剤層上に印刷インキ層が積層されているため発泡しても加飾性を損なわない。また、発泡剤が発泡紙の紙基材に一部含浸するため、紙基材も発泡するので断熱効果が高い断熱層が得られる。さらに成型するカップ原紙と発泡紙とが積層されているが成型に必要なカップ原紙が別層になつているので成型性を損なうことがない。また、2枚の紙を積層し、かつ1枚の紙が発泡することで、強い容器剛性が得られる。
【0019】
<実施例1>
上記の製造方法及び素材による実施例1を説明すると、220g/mのカップ原紙の片面に低密度ポリエチレン樹脂(三井化学社製M16P)により厚み20μmのエクストルーダーコーティングを施す。次に発泡紙の基材紙として、コースター原紙70g/m(新富士製紙製)と前記のカップ原紙とを低密度ポリエチレン(三井化学社製M16P)でサンドエクストルーダラミネーションにより積層する。さらにコースター原紙の紙面に対して、次に示す材料からなる発泡剤をロールコーターで厚み50μm(ドライ)にコーティングするもので、この材料は、エマルジョン水溶液ランディCP100(ミヨシ油脂製)に対し、アクリル系発泡剤F−48(松本油脂製)を5%添加したものを使用した。さらに、このコート面に対し、カップサイド面位置にCP100樹脂と同一材料である樹脂バインダーからなる印刷インキとワニス(大日精化製)を印刷する。
このカップ原紙と発泡紙が積層された積層紙をカップブランクスに打ち抜き、カップ内面側になるブランクス端面をスカイブ加工する。またこのカップ材に対してカップ原紙180g/mの片面に低密度ポリエチレンを20μmの厚みにコーティングした用紙を底蓋材にして紙容器(紙カップ)を成型機にて成型したものである。
このカップの大きさは、口径95.7mmφ、高さ107.4mm、ボトム径64.3mm、ボトムハイ10mmに成型したもので、この成型した紙カップを150℃に設定したオーブンラインを1分間滞留させて、約50μm厚みの発泡層を約400μmの厚みに発泡させることができた。
【0020】
<比較例1>
カップ原紙300g/mに低密度ポリエチレン樹脂を20μmの厚みにエクストルーダーコーティングしたものをカップ用の原紙とし、底蓋は実施例1と同一材料を使用して、実施例1と同一寸法の紙容器(紙カップ)を成型した。
【0021】
効果の確認
断熱性・・90℃の熱湯を容器内に8分目まで注入し、手で保持した際の熱さの官能検査。
保形性・・上記の熱湯を入れたとき、容器変形の有無。
以上の評価結果を表1に示す。
【0022】
【表1】

Figure 2004161324
【0023】
【発明の効果】
本発明は以上の構成であるから、下記に示す如き効果がある。
すなわち、本発明の断熱紙容器は、発泡剤が発泡する層上に印刷インキ層が積層されているため発泡しても加飾性等印刷効果を損なわない。また発泡剤が発泡紙の紙基材に一部含浸するため、含浸した発泡剤及びコーティング面の発泡剤も発泡するので高い断熱効果が得られる。さらに成型するカップ原紙と発泡紙とが積層されているが成型に必要なカップ原紙が別層になつているので成型性を損なうことがなく、しかも2枚の紙を積層しかつ1枚の紙が発泡することで容器剛性が得られると共に、他の発泡カップに比べ強い剛性を付与することができる。
さらに、この断熱紙容器の製造においては、別途特別な製造設備を伴わず、断熱性を付与することができる紙容器の製造が可能となる等の種々の優れた効果を奏するものである。
【図面の簡単な説明】
【図1】本発明の実施例における断熱紙容器の積層構成の一例を示す説明図である。
【図2】本発明の実施例における断熱紙容器の積層構成を示すもので、(A)はその側断面図であり、(B)は加熱によって発泡することによる状態を示す側断面図である。
【図3】従来の断熱紙容器の一例を示す平面で表した説明図である。
【符号の説明】
10……カップ原紙
11……シーラント層
12……接着剤層
14……紙基材
15……発泡剤コート層
16……印刷インキ層
20……発泡紙
30……積層紙
50……従来の断熱紙カップ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a paper container for holding a hot drink such as hot coffee or hot soup in a paper container for preventing heat of the hot drink or the like from being transmitted through the body of the container, and does not cause a burn or the like when held directly in a hand. Thus, the present invention relates to a heat insulating paper container having a heat insulating layer provided on a body portion and a method of manufacturing the same.
[0002]
[Prior art]
BACKGROUND ART Conventionally, a tapered paper container (paper cup) that can be molded by a cup molding machine is generally known as a container. These paper cups may be paper as it is for cold drinks, but if you put a hot drink, such as hot coffee or hot soup, and hold it directly in your hand, the heat of the drink will be transmitted to the hand through the paper cup and your hands and fingers will be There were problems such as dropping due to feeling of heat. Therefore, various paper containers in which a body portion of a paper cup has been subjected to heat insulation treatment are currently used.
[0003]
For example, a general paper container (50) as shown in FIG. 3 is a polyethylene layer (PE) / cup base paper / printing ink layer / polyethylene layer (PE), or a polyethylene layer / cup base paper / polyethylene layer / printing ink layer. A paper container was molded using a laminated paper made of the above, and the polyethylene layer on the side of the printing ink layer was foamed by heating to form a heat insulating layer by foaming the polyethylene layer on the side of the body of the paper container.
However, the heat insulation property of the above paper container is low, and when used in a vending machine or the like, there are cases where the paper container cannot be held in a hand until the paper container is cooled for a while. Therefore, as a paper container having further heat insulation properties, although not shown, a two-layer cup, a paper container obtained by winding embossed paper around a paper container, or a container having a double container itself is provided. These containers have a structure in which a space is formed between the containers to enhance the heat insulating effect.
[0004]
[Problems to be solved by the invention]
However, the former paper container in which the polyethylene layer is foamed has low heat insulating properties as described above, and the rigidity of the paper container may be impaired by injecting a hot drink or the like. In the paper container forming the latter space, the heat insulation property is higher than that of the paper container (paper cup), but it is difficult to maintain the space between the containers due to the structure, and the manufacturing process requires a process. It's complicated and not easy. In particular, the rigidity of the two-layer structure that maintains the space when hot drink or the like is injected is a problem.
[0005]
Therefore, the present invention has been made to solve the above-described problems, and a cup base paper constituting a paper container, a foaming agent, and a paper provided with a printing ink layer are attached to each other to form a paper container (paper cup). A heat insulating layer having a high heat insulating effect on the side of the body due to the foaming agent when heated, and an insulating paper container in which two sheets of paper are laminated and one sheet of paper is foamed to obtain container rigidity. And a method for producing the same.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the insulated paper container of the present invention comprises:
Foamed paper comprising a paper cup base paper provided with a sealant layer on one surface, a foaming agent layer provided on the surface of a paper base made of high-quality paper or the like, and a printing ink layer constituting a picture or the like in the area of the foaming agent layer surface Wherein the paper container is formed from laminated paper in which the paper cup base paper surface and the paper surface side of the foamed paper are bonded together via an adhesive.
[0007]
Further, in the heat insulating paper container according to claim 1,
The bottom lid substrate of the paper container is characterized by a cup base paper / sealant layer configuration.
[0008]
Further, in the heat insulating paper container according to claim 1 or 2,
A heat insulating layer is provided on the side of the body of the container by heating the paper container to foam the foaming agent.
[0009]
Further, in the insulated paper container according to claims 1 to 3,
The paper container is heated in an oven at a temperature of 130 ° C. to 170 ° C. for about 30 to 60 seconds.
[0010]
Further, the method for producing an insulated paper container of the present invention,
The base paper is coated with a sealant layer on one side of the base paper, and a coating agent mixed with a capsule foaming agent is coated on a paper base material such as high-quality paper and dried, and then a printing ink layer for a pattern is applied from above. A foamed paper sheet, the cup base paper surface and the foamed paper base material surface are bonded to each other with an adhesive to form a laminated paper, and the laminated paper is punched into cup side blanks, and a paper end face corresponding to the inner surface side And a paper container formed by coating the base paper with a sealant layer on the bottom of the cup and forming a paper container with a cup forming machine. A heat insulating layer made of a foaming agent is provided on the side surface of the body of the container by heating for 60 seconds.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The heat-insulating paper container of the present invention includes a paper cup base paper provided with a sealant layer on one surface, and a foaming agent layer provided on a paper base material surface of high-quality paper or the like, and a printing ink forming a pattern or the like in the region of the foaming agent layer surface. The paper container is formed from laminated paper in which a paper cup base paper surface and a paper surface side of the foamed paper are bonded together via an adhesive, and the paper container is formed into an oven or the like. The container is heated at a temperature of 130 ° C. to 170 ° C. for about 30 to 60 seconds to provide a heat insulating layer made of a foaming agent on the side surface of the body of the container. Therefore, since the foaming agent impregnates a part of the paper base material and is heated by heating, the paper base material also foams, so that a container having a high heat insulating effect can be obtained. Further, since two papers are laminated and one paper is foamed, this heat-insulating paper container can obtain strong container rigidity.
[0012]
The present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram illustrating an example of a laminated configuration of a heat-insulated paper container according to an embodiment of the present invention. 2A and 2B show a laminated structure of the heat insulating paper container in the embodiment of the present invention, wherein FIG. 2A is a side sectional view thereof, and FIG. 2B is a side sectional view showing a state of foaming by heating. It is.
[0013]
【Example】
As shown in FIG. 1, the configuration of the heat insulating paper container of the present invention is such that a coating agent (15) mixed with a capsule foaming agent is applied to a paper substrate (14), dried, and then used as a pattern or the like. A foamed paper (20) to which a decorating effect is imparted by applying a printing ink layer (16) is obtained. Further, the paper surface of the cup base paper (10) provided with the sealant layer (11) on one surface and the non-printing ink layer surface of the foamed paper (20) are laminated via an adhesive, and the laminated paper for the heat insulating paper container ( 30) is obtained.
[0014]
Further, the present invention will be described with reference to FIG. 2. The laminated paper (30) is punched into cup side blanks, and the end face of the paper corresponding to the inner surface side is skived. Further, as the base paper used for the bottom portion, a paper in which a sealant layer is provided on a cup base paper is prepared for the bottom cover. A paper container is molded from the above materials by a cup molding machine.
[0015]
Next, as shown in FIG. 2B, the foaming agent of the coating agent (15) is foamed by leaving the molded paper container in a heated oven at 130 ° C. to 170 ° C. for about 30 seconds to 60 seconds. As a result, irregularities having a space were formed on the side surface of the cup body, and an insulated paper container having heat insulation was obtained.
[0016]
The material used above is a cup base paper of 100 to 250 g / m 2 as the cup base paper (10), and a thermoplastic resin such as polyethylene, polypropylene, or polyester can be used as the sealant resin layer (11). . Further, as the paper base material (14) of the foamed paper, a paperboard (no-size base paper) of 30 to 300 g / m 2 or a high quality paper of 0.70 to 0.90 g / cc can be selected. The coating agent (15) mixed with a capsule foaming agent is a mixture of a capsule-type foaming agent (eg, acrylic resin) in an emulsion of a binder resin having a Tm of 60 to 140 ° C., and has a capsule diameter of about 5 to 60 μm. The expansion ratio is about 2 to 20 times. Further, the printing ink (16) is preferably made of the same material as the foaming agent binder or a resin having good compatibility as the ink binder. An anchor coating agent may be applied to the foaming agent-coated surface before printing.
[0017]
The method of manufacturing this heat-insulating paper container is as follows: a base paper is coated with a sealant layer (11) made of polyethylene resin or the like on one side; a base paper (10) corresponding to 100 to 250 g / m 2 is mixed; The coating agent (14) of the emulsion liquid of (1) is coated on a paper substrate (14) such as high-quality paper by any of gravure, screen, roll coater or the like, and dried. ) And foamed paper (20). A laminated paper (30) is formed by laminating the cup base paper surface and the foamed paper base material surface with an adhesive such as polyethylene, and the laminating method includes dry lamination, wet lamination, non-sol, extruder sand and the like. Either one can be appropriately selected. The laminated paper (30) is punched into cup side blanks, and the paper end surface corresponding to the inner surface side is skived, and a paper container is formed using a bottom cover made of a base material for a base material in which a sealant layer is coated on a cup base paper. At this time, the method of sealing the bottom lid can be selected from hot air, high frequency, ultrasonic wave, and the like. The molded paper container is placed in an oven or the like and heated at a temperature of 130 ° C. to 170 ° C. for about 30 to 60 seconds to form a heat insulating layer of a foaming agent having a foaming ratio of about 2 to 20 times on the side of the body of the container. Can be granted.
[0018]
The difference between the insulated paper container obtained using the above materials and the conventional insulated paper container is that the printing ink layer is laminated on the coating agent layer in which the foaming agent is foamed, so that even if foamed, it has decorative properties. Does not impair. Further, since the foaming agent partially impregnates the paper base of the foamed paper, the paper base also foams, so that a heat insulating layer having a high heat insulating effect can be obtained. Furthermore, although the cup base paper to be molded and the foamed paper are laminated, the cup base paper required for molding is in another layer, so that the moldability is not impaired. In addition, by stacking two sheets of paper and foaming one sheet of paper, strong container rigidity can be obtained.
[0019]
<Example 1>
Explaining Example 1 using the above-described production method and material, one side of a 220 g / m 2 cup base paper is subjected to an extruder coating having a thickness of 20 μm with a low-density polyethylene resin (M16P manufactured by Mitsui Chemicals, Inc.). Next, as a base paper of foamed paper, coaster base paper 70 g / m 2 (manufactured by Shinfuji Paper) and the above-mentioned cup base paper are laminated with low density polyethylene (M16P, manufactured by Mitsui Chemicals, Inc.) by sand extruder lamination. Further, a foaming agent made of the following material is coated to a thickness of 50 μm (dry) with a roll coater on the paper surface of the coaster base paper. This material is made of an acrylic aqueous solution based on the emulsion aqueous solution Randy CP100 (made by Miyoshi oil and fat). What added 5% of foaming agent F-48 (made by Matsumoto Yushi) was used. Further, a printing ink and a varnish (manufactured by Dainichi Seika) comprising a resin binder of the same material as the CP100 resin are printed on the coat surface at the position of the cup side surface.
The laminated paper in which the cup base paper and the foamed paper are laminated is punched into cup blanks, and the end face of the blanks on the inner surface side of the cup is skived. In addition, a paper container (paper cup) was formed by a molding machine using a sheet obtained by coating low-density polyethylene to a thickness of 20 μm on one side of cup base paper 180 g / m 2 with respect to this cup material.
The size of the cup was 95.7 mmφ in diameter, 107.4 mm in height, 64.3 mm in bottom diameter, and 10 mm in bottom height. The oven was set at 150 ° C. for the molded paper cup, and the oven line was retained for 1 minute. And a foamed layer having a thickness of about 50 μm could be foamed to a thickness of about 400 μm.
[0020]
<Comparative Example 1>
A base paper for a cup is prepared by extruding a low-density polyethylene resin to a thickness of 20 μm on a base paper of the cup 300 g / m 2 , and using the same material as in the embodiment 1 for the bottom lid. A container (paper cup) was molded.
[0021]
Confirmation of effect Thermal insulation: Sensory inspection of the heat when hot water of 90 ° C is poured into the container for 8 minutes and held by hand.
Shape retention: Whether or not the container is deformed when the above hot water is added.
Table 1 shows the above evaluation results.
[0022]
[Table 1]
Figure 2004161324
[0023]
【The invention's effect】
The present invention having the above configuration has the following effects.
That is, in the heat insulating paper container of the present invention, since the printing ink layer is laminated on the layer in which the foaming agent foams, the foaming does not impair the printing effect such as decorativeness even if foaming. Further, since the foaming agent partially impregnates the paper substrate of the foamed paper, the impregnated foaming agent and the foaming agent on the coating surface also foam, so that a high heat insulating effect can be obtained. Further, the cup base paper to be molded and the foamed paper are laminated, but since the cup base paper required for molding is in a separate layer, the moldability is not impaired, and two sheets of paper are laminated and one sheet of paper is formed. By foaming, the rigidity of the container can be obtained, and at the same time, a higher rigidity can be provided as compared with other foamed cups.
Further, in the production of the heat-insulating paper container, various excellent effects such as the production of a paper container capable of imparting heat insulation can be produced without any special manufacturing equipment.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an example of a laminated configuration of a heat insulating paper container in an embodiment of the present invention.
FIGS. 2A and 2B show a laminated structure of a heat insulating paper container in an embodiment of the present invention, in which FIG. 2A is a side sectional view, and FIG. 2B is a side sectional view showing a state of foaming by heating. .
FIG. 3 is an explanatory view showing an example of a conventional heat insulating paper container in a plane.
[Explanation of symbols]
10 cup base paper 11 sealant layer 12 adhesive layer 14 paper base material 15 foaming agent coat layer 16 printing ink layer 20 foamed paper 30 laminated paper 50 conventional Insulated paper cup

Claims (5)

一方の面にシーラント層を設けた紙カップ原紙と、上質紙等による紙基材表面に発泡剤層を設け、さらにこの発泡剤層面の領域に絵柄等を構成する印刷インキ層を設けてなる発泡紙との構成からなり、前記紙カップ原紙面と前記発泡紙の紙面側とを接着剤を介して貼り合わせた積層紙により紙容器を成型したことを特徴とする断熱紙容器。Foamed paper comprising a paper cup base paper provided with a sealant layer on one surface, a foaming agent layer provided on the surface of a paper base made of high quality paper or the like, and a printing ink layer constituting a picture or the like in the area of the foaming agent layer surface Wherein the paper container is formed from a laminated paper in which the paper cup base paper surface and the paper surface side of the foamed paper are pasted together via an adhesive. 前記紙容器の底蓋基材は、紙カップ原紙/シーラント層構成を特徴とする請求項1記載の断熱紙容器。2. The insulated paper container according to claim 1, wherein the bottom lid substrate of the paper container has a paper cup base paper / sealant layer configuration. 前記紙容器を加熱して発泡剤を発泡させることにより、容器の胴部側面に断熱層を設けたことを特徴とする請求項1または請求項2記載の断熱紙容器。The heat insulating paper container according to claim 1 or 2, wherein a heat insulating layer is provided on a side surface of a body of the container by heating the paper container to foam a foaming agent. 前記紙容器の加熱は、130℃〜170℃の温度で、約30〜60秒間オーブンにて加熱し発泡させることを特徴とする請求項1乃至請求項3記載の断熱紙容器。4. The insulated paper container according to claim 1, wherein the heating of the paper container is performed by heating in an oven at a temperature of 130 [deg.] C. to 170 [deg.] C. for about 30 to 60 seconds for foaming. 原紙の片面にシーラント層をコーティングしてなるカップ原紙と、カプセル発泡剤を混合したコーティング剤を上質紙等の紙基材にコーティングし乾燥させた後、この上から絵柄用の印刷インキ層を施してなる発泡紙とからなり、前記カップ原紙面と前記発泡紙基材面とを接着剤を介して貼り合わせて積層紙を構成し、前記積層紙をカップサイドブランクスに打ち抜き、内面側にあたる紙端面をスカイブ加工すると共に、カップ原紙にシーラント層をコーティングした用紙を底蓋として、カツプ成型機により紙容器を成型した後、該紙容器をオーブン等に入れ130℃〜170℃の温度で、約30〜60秒間加熱して紙容器の胴部側面に発泡剤の発泡により断熱層を設けたことを特徴とする断熱紙容器の製造方法。The base paper is coated with a sealant layer on one side of the base paper, and a coating agent mixed with a capsule foaming agent is coated on a paper base material such as high quality paper and dried.After that, a printing ink layer for a pattern is applied from above. A foamed paper sheet, and the cup base paper surface and the foamed paper base material surface are bonded to each other with an adhesive to form a laminated paper, and the laminated paper is punched into cup side blanks, and a paper end surface corresponding to the inner surface side The paper container is molded by a cup molding machine using the paper in which the sealant layer is coated on the base paper of the cup as a bottom cover, and the paper container is placed in an oven or the like at a temperature of 130 ° C. to 170 ° C. for about 30 minutes. A method for producing a heat-insulated paper container, wherein a heat-insulating layer is provided by foaming a foaming agent on the side surface of the body of the paper container by heating for 60 seconds.
JP2002329240A 2002-11-13 2002-11-13 Heat insulation paper container and method for manufacturing the same Pending JP2004161324A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017178332A (en) * 2016-03-29 2017-10-05 大日本印刷株式会社 Multilayer film before foaming and production method of the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017178332A (en) * 2016-03-29 2017-10-05 大日本印刷株式会社 Multilayer film before foaming and production method of the same

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