JP2003155077A - Paper container - Google Patents
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- JP2003155077A JP2003155077A JP2001354239A JP2001354239A JP2003155077A JP 2003155077 A JP2003155077 A JP 2003155077A JP 2001354239 A JP2001354239 A JP 2001354239A JP 2001354239 A JP2001354239 A JP 2001354239A JP 2003155077 A JP2003155077 A JP 2003155077A
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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、食品紙容器に関
し、さらに詳しくは、本発明は、電子レンジにより加熱
して、喫食直前に、容器材料の紙基材層に含有する加熱
発泡性マイクロカプセルが発泡してできる発泡断熱層を
形成し得る紙容器に関する。
【０００２】
【従来の技術】従来、電子レンジにより食品を加熱又は
調理する際に使用するための種々の容器が市販されてい
る。例えば、一般家庭では、耐熱ガラスの容器に食品を
入れて、電子レンジで加熱することが行われている。
【０００３】一方、近年は、電子レンジにより加熱する
ことを前提とした容器入りの食品が市販されており、手
軽に喫食できる食品として、コンビニエンスストア等に
おいて人気が高まりつつある。このような容器入りの食
品は、予め食品を容器に充填して密封した食品容器の形
態で販売されており、喫食する際には、容器ごと電子レ
ンジに入れて加熱し、高温になった食品を喫食するのも
のである。
【０００４】通常、食品を収納するための容器は少なく
とも底板及び胴部を有しているが、前記食品容器は、こ
の底板及び胴部に囲まれた空間に食品が充填されてい
る。そして、容器の材質は、マイクロ波透過性の材質が
使用される。このような容器としては、断熱性の高い発
泡容器が公知である。このような発泡容器を製造する技
術としては、例えば、胴部及び底板よりなる容器を形成
し、該容器の胴部の外側の全面に熱可塑性合成樹脂フィ
ルムを被覆し、被覆した容器を加熱し、加熱した熱可塑
性合成樹脂フィルムを発泡させ、容器の胴部の全面に発
泡断熱層を形成する技術が知られている。
【０００５】しかしながら、昨今の環境汚染防止への要
望から、廃棄処理が簡便で、燃焼しても汚染物質や煤煙
等が出にくく、しかも軽量な紙容器等への転換が進めら
れており、紙基材を主とする紙容器に電子レンジ加熱に
より発泡断熱層が形成可能な機能をもたせることが要求
されている。
【０００６】
【発明が解決しようとする課題】本発明は、上記の課題
に鑑みてなされたもので、食品を喫食する直前に電子レ
ンジにより加熱して容器に発泡断熱層を形成し、食品が
高温に加熱されていても安全に素手で把持できる、断熱
性に優れ、かつ環境に対する負担が少なく、エコロジー
対応の紙容器を提供することを目的とする。
【０００７】
【課題を解決するための手段】上記課題を解決するため
に、請求項１に係る発明は、加熱発泡性マイクロカプセ
ルを含有する紙基材層と、マイクロ波発熱体としての金
属蒸着層と、該金属蒸着層を保護する保護層とを少なく
とも含む構成の紙容器であって、電子レンジにより加熱
して、前記加熱発泡性マイクロカプセルが発泡してでき
る発泡断熱層を形成し得ることを特徴とする紙容器であ
る。
【０００８】
【発明の実施の形態】本発明の好ましい実施形態につい
て図を参照して以下に説明する。図１は、本発明の紙容
器の構成の１例を示した模式断面図である。本発明の１
実施例として、図１（１−１）に示した紙容器１０の容
器側部のＡで示した部分の容器断面を拡大したしたもの
を図１（１−２）に示した。（１−２）に示すように、
加熱発泡性マイクロカプセル１１ａを含有する紙基材層
１１と、マイクロ波発熱体としての金属蒸着層１２と、
該金属蒸着層を保護する保護層１３とをこの順に積層し
た構成からなるものである。
【０００９】また、図２は、本発明の紙容器の構成の他
の例を示した模式断面図である。本発明の１実施例とし
て、図２（２−１）に示した紙容器２０の容器側部のＡ
で示した部分の容器断面を拡大したしたものを図２（２
−２）に示した。（２−２）に示すように、紙基材層２
４と加熱発泡性マイクロカプセル２１ａを含有する紙基
材層２１とを貼合した基材の加熱発泡性マイクロカプセ
ル２１ａを含有する紙基材層２１にマイクロ波発熱体と
しての金属蒸着層２２を設け、該金属蒸着層を保護する
保護層２３を金属蒸着層２２表面に積層した構成からな
るものである。
【００１０】また、図３は、本発明の紙容器の構成のさ
らに他の例を示した模式断面図である。本発明の１実施
例として、図３（３−１）に示した紙容器３０の容器側
部のＡで示した部分の容器断面を拡大したしたものを図
３（３−２）に示した。（３−２）に示すように、紙基
材層３４上に、加熱発泡性マイクロカプセル３１ａを含
有する紙基材層３１と、マイクロ波発熱体としての金属
蒸着層３２と、該金属蒸着層を保護する保護層３３とを
この順に積層した構成に、さらに、加熱発泡性マイクロ
カプセル１ａを含有する紙基材層３１と金属蒸着層３２
との間に薄紙やナイロン、ポリエチレンテレフタレート
フィルム等の基材３５を設けたものである。基材層３５
は、必要に応じて、設けるもので、設けなくても良い。
【００１１】さらに、図１（１−３）、図２（２−
３）、図３（３−３）は、電子レンジにより加熱した本
発明の容器側部Ａの領域を拡大した模式断面図である。
本発明の紙容器１０、２０、３０は、電子レンジにより
加熱して、前記加熱発泡性マイクロカプセル１１ａ、２
１ａ，３１ａが発泡して、発泡マイクロカプセル１１´
ａ、２１´ａ，３１´ａを含有する発泡断熱層１１´、
２１´，３１´を形成し得ることを特徴とするものであ
る。
【００１２】本発明で用いられる加熱発泡性マイクロカ
プセルを含有する紙基材層１１、２１、３１としては、
通常の製紙で使用されるものはどれでも使用することが
できる。本発明で用いられる製紙用パルプは特に制限は
なく、例えば、１００％バ−ジンパルプからなるもの、
１００％再生故紙からなるもの、それらを任意の割合で
混合したもの、針葉樹未晒クラフトパルプ（ＮＵＫ
Ｐ）、針葉樹晒クラフトパルプ（ＮＢＫＰ）、広葉樹晒
クラフトパルプ（ＬＢＫＰ）、針葉樹晒サルファイトパ
ルプ（ＮＢＳＰ）等の木材パルプを主材とし、麻、木
綿、藁パルプ、ケナフ等の非木材パルプなどを製紙して
得られる様々な種類の紙を用いることが可能である。
【００１３】また、本発明で用いられる加熱発泡性マイ
クロカプセル１１ａ、２１ａ，３１ａは、樹脂微粒子中
に低沸点溶剤を内包したもので、一般に、７０〜２００
℃の比較的低温度で直径が３〜５倍、体積で３０〜１２
０倍に膨張する平均粒径が５〜３０μｍの粒子である。
マイクロカプセル内に低沸点溶剤を封入した熱発泡性の
マイクロカプセルである。低沸点溶剤としてはイソブタ
ン、ペンタン、石油エーテル、ヘキサン、低沸点ハロゲ
ン化炭化水素、メチルシラン等の揮発性有機溶剤（発泡
剤）を塩化ビニリデン、アクリロニトリル、アクリル酸
エステル、メタクリル酸エステル等の共重合体から成る
熱可塑性樹脂で包み込んだものであり、マイクロカプセ
ルの膜ポリマーの軟化点以上に加熱されると膜ポリマー
が軟化しはじめ、同時に内包されている発泡剤の蒸気圧
が上昇し、膜が押し広げられてカプセルが膨張する。
【００１４】上記発泡性マイクロカプセルが外殻を形成
する樹脂の軟化点以上に加熱されると樹脂が軟化し始
め、同時に封入されてある低沸点溶剤が気化して蒸気圧
が上昇し、その結果樹脂が押し広げられて膨張し、独立
気泡を形成する。
【００１５】加熱発泡性マイクロカプセルを含有する紙
基材層に含有させる方法として、発泡性のマイクロカプ
セルを抄紙段階で内添して抄紙する方法と抄紙後の二次
加工として外添すなわち含浸する方法があるが、抄紙後
の二次加工として、この外添による含浸方法が望まし
い。外添による含浸方法としては、紙基材を含浸液中に
浸し、過剰量の含浸液を一時的に付与できるディッピン
グ法や、好ましくは、含浸液を一定量だけ塗工または含
浸させるグラビアコーティング法やロールコーティング
法などがあり、紙基材の表裏から含浸液を含浸すること
も可能である。さらに、２ユニット以上あるグラビア含
浸方法では、はじめに紙基材内部に含浸させる含浸液を
片面もしくは両面より施し、基材内部にまで含浸液を浸
透させる。
【００１６】加熱発泡性マイクロカプセルを抄紙段階で
内添して抄紙する方法や、もしくは抄紙後の二次加工と
して外添すなわち含浸する方法により、加熱発泡性マイ
クロカプセルを含有させる紙基材に対して加熱発泡性マ
イクロカプセルを５〜４９重量％（乾燥換算、以下同
様）含有せしめる。加熱発泡性マイクロカプセルの含有
量が５重量％未満であると断熱効果が出難くなり、４９
重量％を越えると経済的に不利になり、また効果がそれ
以上期待でき難くなる。
【００１７】加熱発泡性マイクロカプセルを抄紙段階で
内添して抄紙する方法や、もしくは抄紙後の二次加工と
して外添すなわち含浸する方法により、加熱発泡性マイ
クロカプセルを含有させる場合、必要に応じてバインダ
ーを添加することもできる。こうすることで、発泡性マ
イクロカプセルの分布がより均一に分散するようにな
る。さらに、紙基材からの発泡性マイクロカプセルの脱
落が防止でき、強度も改善できる。
【００１８】上記バインダーとしては、天然ゴム、スチ
レン・ブタジエン共重合樹脂、メチルメタアクリレート
・ブタジエン共重合樹脂、ポリアクリル酸エステル樹
脂、ポリ酢酸ビニル樹脂、ポリ塩化ビニル樹脂等の熱可
塑性樹脂を挙げることができるが、特に限定されるもの
ではない。また、添加量も適宜選択できるもので特に限
定されるものではない。
【００１９】また、図２、３に示した紙容器を構成する
紙基材２４、３４としては、通常の製紙で使用されるも
のはどれでも使用することができ、特に限定されるもの
ではない。
【００２０】本発明で用いられるマイクロ波発熱体とし
ての金属蒸着層１２、２２、３２は、金属蒸着層にはア
ルミニウム、錫、亜鉛、鉄、銅などの蒸着薄膜が挙げら
れるが、アルミニウム蒸着薄膜が望ましい。金属蒸着層
の厚さは、発熱量および加熱時スパークが発生しない様
に適宜設定される。
【００２１】本発明で用いられる上記金属蒸着層を保護
する保護層１３、２３、３３としては、薄紙例えばクラ
フト紙などや、熱可塑性樹脂としてナイロン、ポリエチ
レンテレフタレートフィルム等が挙げられる。２００℃
程度の温度に耐えられるものであれば特に限定されるも
のではない。
【００２２】以上の紙容器は、次の様に使用することを
特徴とするものである。例えば、図２を参照して以下に
説明する。図２（２−１）に示す本発明の１実施例とし
ての紙容器２０側部の領域Ａで示した部分を拡大した電
子レンジで加熱する前の層構成を模式的に図２（２−
２）示した。この容器を、電子レンジに入れ、加熱す
る。
【００２３】電子レンジ加熱により、食品（図示せず）
および発泡性マイクロカプセル２１ａを含有する紙基材
層２１は加熱され、図２（２−３）に示すように発泡性
マイクロカプセル２１ａが発泡して、発泡マイクロカプ
セル２１´ａとなり発泡断熱層２１´を形成する。
【００２４】以上のように、本発明の紙容器は、喫食す
る段階で、容器に発泡断熱層が形成されるため、断熱効
果に優れ、食品が高温に加熱されていても素手で安全に
把持し得るものである。さらに、本発明の紙容器は、発
泡断熱層が形成されるために、断熱効果に優れるととも
に、容器の剛性およびリップ強度の向上、軽量化などの
効果を奏するものである。
【００２５】本発明の紙容器は、常温よりも高い温度で
喫食する各種の食品、例えば、コーヒー、紅茶等の飲
料、スープ類等の液状食品、おかゆ、リゾット、ぜんざ
い等の流動状又は半固形状食品、おでん、肉類、惣菜等
の固形状食品、加熱により液状となる各種冷凍食品等を
例示することができる。
【００２６】
【実施例】次に、実施例を示して本発明を説明するが、
本発明は以下の実施例に限定されるものではない。
【００２７】〈実施例１〉坪量５０ｇ／ｍ2、厚さ０．
１ｍｍの紙基材と電子レンジ加熱発泡性のマイクロカプ
セル３０重量％含有する坪量１００ｇ／ｍ2、厚さ０．
１５ｍｍの紙基材との２層からなる紙基材の電子レンジ
加熱発泡性のマイクロカプセル含有する紙基材側の表面
に蒸着装置により厚さ１００Åのアルミニウム蒸着を施
し、マイクロ波発熱体としての金属蒸着層を形成した
後、ドライラミネート用接着剤を介して、薄紙として、
厚さ０．１２ｍｍ、坪量６０ｇ／ｍ2のクラフト紙を貼
合しそのクラフト紙表面に厚さは約３０μｍの低密度ポ
リエチレンを押し出しラミネートし、厚さ４．０ｍｍの
紙容器材料を作製した。
【００２８】以上の紙容器材料を、常法によりカップ成
形機により、紙容器を作製した。容器は、胴部及び底板
よりなり、胴部の外側に電子レンジ加熱発泡性のマイク
ロカプセル含有する紙基材を含む紙基材層、内側に低密
度ポリエチレン層が位置する形態とした。
【００２９】上記で得られた紙容器を２００Ｗの電子レ
ンジに入れて、２０秒加熱後と１２０秒加熱後の紙容器
の厚さの変化を測定した結果を表１に示した。
【００３０】〈実施例２〉実施例１において、薄紙とし
てクラフト紙の代わりに厚さ１２μｍのポリエステルフ
ィルムを用いこのポリエステルフィルムの表面にアルミ
ニウム蒸着を施し、そのアルミニウム蒸着面と電子レン
ジ加熱発泡性のマイクロカプセル含有する紙基材側の表
面とが接合するように貼合した以外は実施例１と同様に
して紙容器材料を作製し、紙容器成型を行い、その紙容
器について電子レンジ加熱前後の容器の厚さの変化を測
定した結果を表１に示した。
【００３１】〈比較例１〉実施例１において、マイクロ
波発熱体としてのアルミニウム金属蒸着層を形成しない
以外は実施例１と同様にして紙容器材料を作製し、紙容
器成型を行い、その紙容器について電子レンジ加熱前後
の容器の厚さの変化を測定した結果を表１に示した。
【００３２】〈比較例２〉実施例１において、マイクロ
波発熱体としてのアルミニウム金属蒸着層を形成しない
で、薄紙としてクラフト紙の代わりに厚さ１２μｍのポ
リエチレンフィルムを用いた以外は実施例１と同様にし
て紙容器材料を作製し、紙容器成型を行い、その紙容器
について電子レンジ加熱前後の容器の厚さの変化を測定
した結果を表１に示した。
【００３３】
【表１】
【００３４】表１より明らかなとおり、本発明の紙容器
（実施例１、２）は、喫食する前の段階では、容器が非
発泡状態であるが、電子レンジ加熱により、発泡性マイ
クロカプセルを含有する紙基材層は加熱され、発泡性マ
イクロカプセルが発泡して、発泡断熱層が形成されるた
めに、喫食する段階で、断熱効果に優れ、食品が高温に
加熱されていても素手で安全に把持し得るものであっ
た。さらに、本発明の紙容器は、発泡断熱層が形成され
るために、断熱効果に優れるとともに、軽量で、容器の
剛性およびリップ強度が向上した。これに対して、比較
例１、２で得られた紙容器は、発泡断熱層が形成されな
いために、喫食する段階で、電子レンジ加熱により食品
が高温となり、容器を素手で把持できるものではなかっ
た。
【００３５】
【発明の効果】本発明により、加熱発泡性マイクロカプ
セルを含有する紙基材層と、マイクロ波発熱体としての
金属蒸着層と、該金属蒸着層を保護する保護層を少なく
とも含む構成としたことで、電子レンジにより加熱し
て、前記加熱発泡性マイクロカプセルが発泡してできる
発泡断熱層を形成し得ることから、食品を喫食する直前
に電子レンジにより加熱して容器に発泡断熱層を形成
し、食品が高温に加熱されていても素手で安全に把持で
き、安全に喫食し得る、断熱性に優れ、かつ環境に対す
る負担が少なく、エコロジー対応の食品用紙容器を提供
することができた。さらに、発泡断熱層を形成すること
で軽量化、容器の剛性およびリップ強度が向上する等の
効果を奏するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a food paper container, and more particularly to a food paper container which is heated by a microwave oven and immediately before eating. The present invention relates to a paper container capable of forming a foamed heat insulating layer formed by foaming a heat-foamable microcapsule contained in a material layer. 2. Description of the Related Art Conventionally, various containers have been marketed for use in heating or cooking foods with a microwave oven. For example, in ordinary households, food is put in a heat-resistant glass container and heated with a microwave oven. On the other hand, in recent years, foods in containers premised on heating by a microwave oven have been marketed, and the foods which can be easily eaten are increasing in convenience stores and the like. Such a food in a container is sold in the form of a food container in which the food is filled in a container in advance and sealed, and when eating, the whole container is heated in a microwave oven, and the heated food is heated. It is something to eat. [0004] Usually, a container for storing food has at least a bottom plate and a body, and the food container is filled with food in a space surrounded by the bottom plate and the body. The material of the container is a microwave permeable material. As such a container, a foaming container having high heat insulating properties is known. As a technique for manufacturing such a foamed container, for example, a container formed of a body and a bottom plate is formed, a thermoplastic synthetic resin film is coated on the entire outer surface of the body of the container, and the coated container is heated. There is known a technique in which a heated thermoplastic synthetic resin film is foamed to form a foamed heat insulating layer on the entire surface of a body of a container. [0005] However, due to recent demands for environmental pollution prevention, there has been a shift to paper containers and the like which are easy to dispose of, and which do not easily emit pollutants and soot even when burned. It is required that a paper container mainly composed of a base material has a function of forming a foamed heat insulating layer by microwave heating. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and forms a foamed heat-insulating layer in a container by heating with a microwave oven immediately before eating food. It is an object of the present invention to provide an ecologically compatible paper container that can be safely gripped with bare hands even when heated to a high temperature, has excellent heat insulation properties, and has a small burden on the environment. [0007] In order to solve the above-mentioned problems, the invention according to claim 1 comprises a paper base layer containing heat-expandable microcapsules, and a metal deposition as a microwave heating element. A paper container having at least a layer and a protective layer for protecting the metal-deposited layer, which can be heated by a microwave oven to form a foamed heat insulating layer formed by foaming the heat-foamable microcapsules. It is a paper container characterized by the above-mentioned. A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of the configuration of the paper container of the present invention. 1 of the present invention
As an example, FIG. 1 (1-2) shows an enlarged cross section of the container indicated by A on the container side of the paper container 10 shown in FIG. 1 (1-1). As shown in (1-2),
Paper base layer 11 containing heat-foamable microcapsules 11a, metal-deposited layer 12 as a microwave heating element,
The protective layer 13 for protecting the metal deposition layer is laminated in this order. FIG. 2 is a schematic sectional view showing another example of the configuration of the paper container of the present invention. As one embodiment of the present invention, A of the container side of the paper container 20 shown in FIG.
Fig. 2 (2)
-2). As shown in (2-2), the paper base material layer 2
4 and the paper base layer 21 containing the heat-foamable microcapsules 21a, the metal base layer 21 as the microwave heating element is provided on the paper base layer 21 containing the heat-foamable microcapsules 21a. The protective layer 23 is provided on the surface of the metal deposition layer 22 to protect the metal deposition layer. FIG. 3 is a schematic sectional view showing still another example of the configuration of the paper container of the present invention. As one embodiment of the present invention, FIG. 3 (3-2) shows an enlarged cross section of the container indicated by A on the container side of the paper container 30 shown in FIG. 3 (3-1). . As shown in (3-2), a paper base layer 31 containing a heat-foamable microcapsule 31a, a metal vapor deposition layer 32 as a microwave heating element, and a metal vapor deposition layer And a protective layer 33 for protecting the paper base layer 31 containing the heat-foamable microcapsules 1a and a metal deposition layer 32.
And a base material 35 such as thin paper, nylon, or polyethylene terephthalate film. Base material layer 35
Are provided as necessary and need not be provided. Further, FIGS. 1 (1-3) and 2 (2-
3) and FIG. 3 (3-3) are schematic cross-sectional views in which the region of the container side portion A of the present invention heated by a microwave oven is enlarged.
The paper containers 10, 20, and 30 of the present invention are heated by a microwave oven to produce the heat-foamable microcapsules 11a and 2a.
1a and 31a are foamed and foam microcapsules 11 '
a, a foamed heat insulating layer 11 'containing 21'a, 31'a,
21 'and 31' can be formed. The paper base layers 11, 21, 31 containing the heat-foamable microcapsules used in the present invention include:
Any of those used in normal papermaking can be used. The papermaking pulp used in the present invention is not particularly limited, for example, those made of 100% virgin pulp,
What consists of 100% recycled waste paper, what mixes them at an arbitrary ratio, unbleached kraft pulp (NUK
P), softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulphite pulp (NBSP), etc., and non-wood pulp such as hemp, cotton, straw pulp, kenaf, etc. It is possible to use various types of paper obtained by making paper. The heat-foamable microcapsules 11a, 21a and 31a used in the present invention are obtained by encapsulating a low-boiling solvent in resin fine particles.
3-5 times the diameter at a relatively low temperature of 30 ° C, 30-12 volumes by volume
The particles have an average particle diameter of 5 to 30 μm which expands to 0 times.
This is a heat-foamable microcapsule in which a low boiling point solvent is sealed in the microcapsule. Examples of low-boiling solvents include volatile organic solvents (foaming agents) such as isobutane, pentane, petroleum ether, hexane, low-boiling halogenated hydrocarbons, and methylsilane. When heated above the softening point of the microcapsule membrane polymer, the membrane polymer begins to soften, and at the same time the vapor pressure of the contained foaming agent increases, causing the membrane to be pushed. When expanded, the capsule expands. When the foamable microcapsules are heated above the softening point of the resin forming the outer shell, the resin starts to soften, and at the same time, the encapsulated low-boiling solvent vaporizes and the vapor pressure rises. The resin is expanded as it expands, forming closed cells. As a method of incorporating the heat-expandable microcapsules into the paper base material layer, a method of internally adding the expandable microcapsules at the papermaking stage, and a method of externally adding or impregnating the paper as a secondary process after the papermaking. There is a method, but as a secondary processing after papermaking, this impregnation method by external addition is desirable. As the impregnation method by external addition, a dipping method in which a paper substrate is immersed in an impregnation liquid and an excessive amount of the impregnation liquid can be temporarily applied, or preferably, a gravure coating method in which a predetermined amount of the impregnation liquid is applied or impregnated. And a roll coating method, and it is also possible to impregnate the impregnating liquid from the front and back of the paper substrate. Further, in the gravure impregnation method having two or more units, first, an impregnating liquid for impregnating the inside of the paper base material is applied from one side or both sides, and the impregnating liquid permeates the inside of the base material. The paper base containing the heat-expandable microcapsules can be prepared by internally adding the heat-expandable microcapsules at the paper-making stage, or by externally adding or impregnating as secondary processing after the paper-making. To make the heat-foamable microcapsules 5 to 49% by weight (dry basis, the same applies hereinafter). When the content of the heat-foamable microcapsules is less than 5% by weight, the heat insulating effect is hardly obtained, and
Exceeding the weight percentage is economically disadvantageous and the effect cannot be expected any more. If the heat-expandable microcapsules are to be contained by a method of internally adding the heat-expandable microcapsules at the papermaking stage, or by externally adding or impregnating as a secondary processing after the papermaking, if necessary, A binder can also be added. By doing so, the distribution of the expandable microcapsules can be more uniformly dispersed. Further, the foamable microcapsules can be prevented from falling off from the paper substrate, and the strength can be improved. Examples of the binder include thermoplastic resins such as natural rubber, styrene / butadiene copolymer resin, methyl methacrylate / butadiene copolymer resin, polyacrylate resin, polyvinyl acetate resin and polyvinyl chloride resin. , But is not particularly limited. Further, the amount of addition can be appropriately selected and is not particularly limited. As the paper bases 24 and 34 constituting the paper container shown in FIGS. 2 and 3, any ones used in ordinary papermaking can be used, and there is no particular limitation. . The metal vapor-deposited layers 12, 22, and 32 as the microwave heating element used in the present invention include a metal vapor-deposited thin film of aluminum, tin, zinc, iron, copper and the like. Is desirable. The thickness of the metal deposition layer is appropriately set so that the calorific value and spark during heating do not occur. The protective layers 13, 23, 33 for protecting the above-mentioned metal vapor-deposited layer used in the present invention include thin paper such as kraft paper, and thermoplastic resins such as nylon and polyethylene terephthalate films. 200 ° C
There is no particular limitation as long as it can withstand the temperature of the order. The above paper container is characterized in that it is used as follows. For example, a description will be given below with reference to FIG. FIG. 2 (2-1) schematically shows a layer configuration before heating the portion indicated by the region A on the side of the paper container 20 as an embodiment of the present invention shown in FIG.
2) indicated. The container is placed in a microwave and heated. Food (not shown) by microwave heating
The paper base layer 21 containing the foamable microcapsules 21a is heated, and the foamable microcapsules 21a foam as shown in FIG. 2 (2-3) to form foamed microcapsules 21'a, and the foamed heat insulating layer 21 '. As described above, the paper container of the present invention has an excellent heat insulating effect because the foamed heat-insulating layer is formed on the container at the stage of eating, and can be safely gripped with bare hands even when the food is heated to a high temperature. Can be done. Further, the paper container according to the present invention has an excellent heat insulating effect due to the formation of the foam heat insulating layer, and has effects such as improvement in rigidity and lip strength of the container and weight reduction. The paper container of the present invention can be used for various foods eaten at a temperature higher than room temperature, for example, beverages such as coffee and tea, liquid foods such as soups, liquid or semi-solid such as rice porridge, risotto, and zenzai. Examples include solid foods such as shaped foods, oden, meat, and prepared foods, and various frozen foods that become liquid by heating. Next, the present invention will be described with reference to examples.
The present invention is not limited to the following examples. Example 1 A basis weight of 50 g / m 2 and a thickness of 0.1 g / m 2 were used.
A 1 mm paper base and 30% by weight of a microcapsule capable of being heated and foamed by a microwave oven have a basis weight of 100 g / m 2 and a thickness of 0.1 g / m 2 .
A 15 mm paper base and a paper base consisting of two layers were microwave-heated and foamed on the surface of the paper base side containing the microcapsules containing foamable microcapsules. After forming the metal deposition layer, through the adhesive for dry lamination, as thin paper,
A kraft paper having a thickness of 0.12 mm and a basis weight of 60 g / m 2 was stuck, and a low-density polyethylene having a thickness of about 30 μm was extruded and laminated on the surface of the kraft paper to produce a paper container material having a thickness of 4.0 mm. . A paper container was prepared from the above paper container material by a conventional method using a cup molding machine. The container was composed of a body and a bottom plate, and a paper base layer containing a paper base containing microcapsules heat-expandable in a microwave oven was positioned outside the body, and a low-density polyethylene layer was positioned inside. The paper container obtained above was placed in a microwave oven of 200 W, and the results of measurement of the change in thickness of the paper container after heating for 20 seconds and after heating for 120 seconds are shown in Table 1. <Example 2> In Example 1, a polyester film having a thickness of 12 μm was used as a thin paper instead of kraft paper, and the surface of this polyester film was subjected to aluminum vapor deposition. A paper container material was prepared in the same manner as in Example 1 except that the surface of the paper substrate side containing the microcapsules was bonded so as to be bonded, and the paper container was molded. Table 1 shows the results of measuring the change in the thickness of the container. <Comparative Example 1> A paper container material was prepared in the same manner as in Example 1, except that an aluminum metal vapor-deposited layer as a microwave heating element was not formed. Table 1 shows the results of measuring the change in the thickness of the container before and after heating the microwave oven. Comparative Example 2 Example 1 was the same as Example 1 except that an aluminum metal vapor-deposited layer as a microwave heating element was not formed and a polyethylene film having a thickness of 12 μm was used instead of kraft paper as thin paper. In the same manner, a paper container material was produced, the paper container was molded, and the result of measuring the change in the thickness of the paper container before and after heating the microwave oven is shown in Table 1. [Table 1] As is clear from Table 1, the paper container of the present invention (Examples 1 and 2) is in a non-foamed state before eating, but the foamable microcapsules are heated by microwave heating. The containing paper base layer is heated, and the foamable microcapsules are foamed to form a foamed heat insulating layer, so at the stage of eating, it has an excellent heat insulating effect, and even if the food is heated to a high temperature, it is bare handed It could be safely held. Further, the paper container of the present invention has a superior heat insulating effect due to the formation of the foam heat insulating layer, is lightweight, and has improved rigidity and lip strength of the container. On the other hand, in the paper containers obtained in Comparative Examples 1 and 2, since the foamed heat insulating layer was not formed, the food became hot due to microwave heating at the stage of eating, and the containers could not be grasped with bare hands. Was. According to the present invention, a structure comprising at least a paper base layer containing heat-foamable microcapsules, a metal deposition layer as a microwave heating element, and a protective layer for protecting the metal deposition layer By heating with a microwave oven, a foamed heat insulating layer formed by foaming the heat-foamable microcapsules can be formed. It is possible to provide a food paper container that can be safely grasped with bare hands even when the food is heated to a high temperature, can be eaten safely, has excellent heat insulating properties, has a low burden on the environment, and is ecologically compatible. Was. Further, by forming the foamed heat insulating layer, effects such as reduction in weight, improvement in rigidity and lip strength of the container, and the like are exhibited.
【図面の簡単な説明】
【図１】本発明の１実施例としての紙容器の断面を示す
模式断面図である。（１−１）は、紙容器の断面を示す
模式断面図である。（１−２）は、電子レンジ加熱前の
紙容器側部Ａの領域を拡大した模式断面図である。（１
−３）は、電子レンジ加熱後の紙容器側部Ａの領域を拡
大した模式断面図である。
【図２】本発明の１実施例としての紙容器の断面を示す
模式断面図である。（２−１）は、紙容器の断面を示す
模式断面図である。（２−２）は、電子レンジ加熱前の
紙容器側部Ａの領域を拡大した模式断面図である。（２
−３）は、電子レンジ加熱後の紙容器側部Ａの領域を拡
大した模式断面図である。
【図３】本発明の１実施例としての紙容器の断面を示す
模式断面図である。（３−１）は、紙容器の断面を示す
模式断面図である。（３−２）は、電子レンジ加熱前の
紙容器側部Ａの領域を拡大した模式断面図である。（３
−３）は、電子レンジ加熱後の紙容器側部Ａの領域を拡
大した模式断面図である。
【符号の説明】
１０、２０、３０・・・紙容器
１１、２１、３１・・・発泡前の紙基材層
１１ａ、２１ａ、３１ａ・・・加熱発泡性マイクロカプ
セル
１１´、２１´、３１´・・・発泡後の紙基材層
１１´ａ、２１´ａ、３１´ａ・・・発泡マイクロカプ
セル
１２、２２、３２・・・金属蒸着層
１３、２３、３３・・・保護層
２４、３４・・・紙基材層
Ａ・・・容器側部の一部断面を拡大する領域BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional view showing a section of a paper container as one embodiment of the present invention. (1-1) is a schematic sectional view showing a section of the paper container. (1-2) is a schematic cross-sectional view in which the region of the paper container side portion A before the microwave oven is heated is enlarged. (1
-3) is a schematic cross-sectional view in which the region of the paper container side part A after the microwave heating is enlarged. FIG. 2 is a schematic sectional view showing a section of a paper container as one embodiment of the present invention. (2-1) is a schematic sectional view showing a section of the paper container. (2-2) is a schematic cross-sectional view in which the region of the paper container side portion A before the microwave oven is heated is enlarged. (2
-3) is a schematic cross-sectional view in which the region of the paper container side part A after the microwave heating is enlarged. FIG. 3 is a schematic sectional view showing a section of a paper container as one embodiment of the present invention. (3-1) is a schematic sectional view showing a section of the paper container. (3-2) is an enlarged schematic cross-sectional view of a region of a paper container side portion A before heating in a microwave oven. (3
-3) is a schematic cross-sectional view in which the region of the paper container side part A after the microwave heating is enlarged. [Description of Signs] 10, 20, 30: paper containers 11, 21, 31: paper base material layers 11a, 21a, 31a before foaming: heat-foamable microcapsules 11 ', 21', 31 '... Foamed paper base material layers 11'a, 21'a, 31'a ... Foamed microcapsules 12, 22, 32 ... Metal deposition layers 13, 23, 33 ... Protective layer 24 , 34: paper base layer A: area for enlarging a partial cross section of the container side
Claims (1)
基材層と、マイクロ波発熱体としての金属蒸着層と、該
金属蒸着層を保護する保護層とを少なくとも含む構成の
紙容器であって、電子レンジにより加熱して、前記加熱
発泡性マイクロカプセルが発泡してできる発泡断熱層を
形成し得ることを特徴とする紙容器。Claims: 1. A constitution comprising at least a paper base layer containing heat-foamable microcapsules, a metal deposition layer as a microwave heating element, and a protective layer for protecting the metal deposition layer. The paper container according to any one of claims 1 to 3, wherein the foamed heat-insulating microcapsules are foamed and heat-insulated by heating in a microwave oven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001354239A JP2003155077A (en) | 2001-11-20 | 2001-11-20 | Paper container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001354239A JP2003155077A (en) | 2001-11-20 | 2001-11-20 | Paper container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003155077A true JP2003155077A (en) | 2003-05-27 |
Family
ID=19166125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001354239A Pending JP2003155077A (en) | 2001-11-20 | 2001-11-20 | Paper container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003155077A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130023188A (en) * | 2009-06-23 | 2013-03-07 | 엘비피 매뉴팩츄어링 인크. | Insulating packaging |
| US8529723B2 (en) | 2010-09-01 | 2013-09-10 | Lbp Manufacturing, Inc. | Process of expediting activation of heat-expandable adhesives/coatings used in making packaging substrates |
| WO2014058437A1 (en) * | 2012-10-12 | 2014-04-17 | Empire Technology Development Llc | Containers with shape-changing materials |
| US9056712B2 (en) | 2006-04-03 | 2015-06-16 | Lbp Manufacturing, Inc. | Thermally activatable insulating packaging |
| JP2016113203A (en) * | 2014-12-18 | 2016-06-23 | アサヒグループホールディングス株式会社 | Container for food product |
| JP2016132231A (en) * | 2015-01-22 | 2016-07-25 | 大王製紙株式会社 | Sheet for heat-insulating container and heat-insulating container |
| US9522772B2 (en) | 2006-04-03 | 2016-12-20 | Lbp Manufacturing Llc | Insulating packaging |
| US10183458B2 (en) | 2006-04-03 | 2019-01-22 | Lbp Manufacturing Llc | Insulated packaging and method of making same |
| JP2020083407A (en) * | 2018-11-29 | 2020-06-04 | 東京インキ株式会社 | Microwave foam laminate, microwave foam package and manufacturing method of microwave foam package |
Citations (5)
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|---|---|---|---|---|
| JPH07233896A (en) * | 1994-02-22 | 1995-09-05 | Matsushita Electric Ind Co Ltd | Heat insulating body and manufacture thereof |
| JPH07265189A (en) * | 1994-03-31 | 1995-10-17 | New Oji Paper Co Ltd | Production of non-slip sheet-laminated bundle |
| JP2000142825A (en) * | 1998-11-05 | 2000-05-23 | Dainippon Printing Co Ltd | Container for heating with microwave oven |
| JP2000302178A (en) * | 1999-04-19 | 2000-10-31 | Nitto Denko Corp | Food packaging body |
| JP2000335629A (en) * | 1999-05-28 | 2000-12-05 | Oike Ind Co Ltd | Brilliant laminate for food and container for food |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07233896A (en) * | 1994-02-22 | 1995-09-05 | Matsushita Electric Ind Co Ltd | Heat insulating body and manufacture thereof |
| JPH07265189A (en) * | 1994-03-31 | 1995-10-17 | New Oji Paper Co Ltd | Production of non-slip sheet-laminated bundle |
| JP2000142825A (en) * | 1998-11-05 | 2000-05-23 | Dainippon Printing Co Ltd | Container for heating with microwave oven |
| JP2000302178A (en) * | 1999-04-19 | 2000-10-31 | Nitto Denko Corp | Food packaging body |
| JP2000335629A (en) * | 1999-05-28 | 2000-12-05 | Oike Ind Co Ltd | Brilliant laminate for food and container for food |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9591937B2 (en) | 2006-04-03 | 2017-03-14 | Lbp Manufacturing Llc | Insulating container |
| US9648969B2 (en) | 2006-04-03 | 2017-05-16 | Lbp Manufacturing Llc | Insulating packaging |
| US10183458B2 (en) | 2006-04-03 | 2019-01-22 | Lbp Manufacturing Llc | Insulated packaging and method of making same |
| US9056712B2 (en) | 2006-04-03 | 2015-06-16 | Lbp Manufacturing, Inc. | Thermally activatable insulating packaging |
| US10144573B2 (en) | 2006-04-03 | 2018-12-04 | Lbp Manufacturing Llc | Thermally activatable insulating packaging |
| US9522772B2 (en) | 2006-04-03 | 2016-12-20 | Lbp Manufacturing Llc | Insulating packaging |
| US9580228B2 (en) | 2006-04-03 | 2017-02-28 | Lbp Manufacturing Llc | Thermally activatable insulating packaging |
| KR20130023188A (en) * | 2009-06-23 | 2013-03-07 | 엘비피 매뉴팩츄어링 인크. | Insulating packaging |
| KR101882294B1 (en) * | 2009-06-23 | 2018-07-27 | 엘비피 매뉴팩츄어링 인크. | Insulating packaging |
| US8529723B2 (en) | 2010-09-01 | 2013-09-10 | Lbp Manufacturing, Inc. | Process of expediting activation of heat-expandable adhesives/coatings used in making packaging substrates |
| US20150266652A1 (en) * | 2012-10-12 | 2015-09-24 | Empire Technology Development Llc | Containers with shape-changing materials |
| WO2014058437A1 (en) * | 2012-10-12 | 2014-04-17 | Empire Technology Development Llc | Containers with shape-changing materials |
| JP2016113203A (en) * | 2014-12-18 | 2016-06-23 | アサヒグループホールディングス株式会社 | Container for food product |
| JP2016132231A (en) * | 2015-01-22 | 2016-07-25 | 大王製紙株式会社 | Sheet for heat-insulating container and heat-insulating container |
| JP2020083407A (en) * | 2018-11-29 | 2020-06-04 | 東京インキ株式会社 | Microwave foam laminate, microwave foam package and manufacturing method of microwave foam package |
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