JP3581241B2

JP3581241B2 - Microwave packaging bag

Info

Publication number: JP3581241B2
Application number: JP29737097A
Authority: JP
Inventors: 雅教柴崎
Original assignee: Fuji Seal Inc
Current assignee: Fuji Seal Inc
Priority date: 1997-10-29
Filing date: 1997-10-29
Publication date: 2004-10-27
Anticipated expiration: 2017-10-29
Also published as: JPH11130159A

Description

【０００１】
【発明の属する技術分野】
本願発明は、電子レンジで加熱調理できるように食品を収容できる電子レンジ用包装袋に関する。
【０００２】
【従来の技術】
従来、包装袋により密封包装された被調理品（特に液状物）は、湯煎加熱による調理方法に限られ、電子レンジを使用すると、加熱調理時に、被調理品の蒸発水分により内部圧力が上昇するため、包装シートが風船状に脹らみ破裂するおそれがある。
【０００３】
従って、電子レンジで調理する場合には、液洩れすることなく蒸気を逃がす工夫が必要となり、そこで、従来では包装袋に逆止弁を付けたり、調理直前に包装袋の一部を鋏で切断したりしていた。
【０００４】
【発明が解決しようとする課題】
しかしながら、逆止弁を使用した場合には、機能的に不完全であったり、また、コストが高くなり、普及するには至っていない。また、液状の被調理品が煮沸して吹きこぼれたりする恐れがある。
【０００５】
また、図９に示す如く、重ね合わされた一対の包装シート３の内面同士を接着部１１’ で接着した背貼り部７’と、被調理品が収容される収容空間部９’とを有し、前記背貼り部７’に包装シート３’が接着されない第一及び第二蒸気通路２５ａ’，２５ｂ’ を収容空間部９’に連通して設け、背貼り部７’の上縁７ａ’ に下方（収容空間部９’側）に向けて包装シート３’を破断可能な切欠部２１’ を形成し、第二蒸気通路２５ｂ’に対して前記切欠部２１’ と反対位置で且つ背貼り部７’の破断方向と直交する方向に形成されたストッパー用切込み２２’ を設けたものも考えられる。この包装袋に収容した被調理品を加熱調理する際に、前もって切欠部２１’ から包装シート３’を破断して第二蒸気通路２５ｂ’の一端部を蒸気排出口として開放することで、加熱調理により発生する蒸気が第一及び第二蒸気通路２５ａ’，２５ｂ’ を介して蒸気排出口から外部に排出されるので、簡単に電子レンジを使用して被調理品を調理できる。
【０００６】
かかる包装袋は蒸気排出口を形成すべく背貼り部７’の上縁７ａ’ の切欠部２１’ から包装シート３’を破断した際、その破断がストッパー用切込み２２’ で止まるよう構成されているものの、破断の方向がズレたり、破断する力が強すぎる場合等にあっては、ストッパー用切込み２２’ よりも下方の包装シート３’、更には収容空間部９’の包装シート３’まで破断されて、被調理品が漏出するおそれがあった。
【０００７】
また、被調理品を加熱調理した際に第二蒸気通路２５ｂ’に被調理品が進入して、蒸気通路２５’ を閉塞してしまい、内部の圧力により袋本体１’が破裂するおそれもあった。さらに、切欠部２１’ からの破断（蒸気排出口の形成）を行なわずに、加熱調理した場合にあっても、袋本体１’が破裂するおそれもあった。
【０００８】
本願発明は、上記従来の問題点に鑑みてなされたもので、本願発明の第一の課題は、蒸気排出口の形成を容易に行なうことができ、また第二の課題は、電子レンジで加熱調理する際に被調理品から発生する蒸気を効率良く排出して、袋本体の破裂を防止でき、さらに第三の課題は蒸気排出口を形成し忘れた場合にあっても、袋本体の破裂を防止できる電子レンジ用包装袋を提供することにある。
【０００９】
【課題を解決するための手段】
本願発明は、上記第一及び第三の課題を解決すべくなされたものであり、本願発明に係る電子レンジ用包装袋は、重ね合わされた一対の包装シート3 の内面同士を接着部11で接着してなる背貼り部7 と、被調理品A が収容される収容空間部9 とを有する電子レンジ用包装袋において、前記背貼り部7 には、収容空間部9 に連通する蒸気通路25が形成され、しかも該背貼り部7 の接着部11には、蒸気通路25と連通する蒸気排出口27を形成すべく、背貼り部7 の縁部7aに向けて該背貼り部7 の包装シート3 を破断するための切込部21が形成され、前記接着部 11 は、前記蒸気通路 25 を外部と遮断するための密封シール部 15 と、該密封シール部 15 と離間して設けられた島状シール部 17 とから構成されてなり、該島状シール部 17 は、蒸気排出口 27 の形成を行なわずに加熱調理した際に、収容空間部 9 内の圧力上昇により剥離して排出口 31 が形成されるよう構成されてなるていることを特徴とする。
【００１０】
上記構成からなる本願発明に係る電子レンジ用包装袋は、収容空間部9 に収容される被調理品Ａを加熱調理するに際して、前もって背貼り部7 の切込部21から縁部7aに向けて包装シート3 を破断することで蒸気排出口27を形成することができ、収容空間部9 側の包装シート3 が破断することがない。また、切込部 21 からの破断（蒸気排出口 27 の形成）をし忘れて加熱調理した場合にあっても、被調理品Ａの加熱調理による蒸気によって収容空間部 9 内の圧力が上昇することで、島状シール部 17 に排出口 31 が形成され、内部の蒸気が該排出口 31 より外部に排出されるので、袋本体 1 の破裂を防止できる。
【００１１】
また、本願発明は上記第二の課題を解決すべく請求項２記載の如き構成を採用できる。即ち、本願請求項２記載の発明は、接着部１１が蒸気通路２５を外部と遮断するための密封シール部１５と、該密封シール部１５と離間して設けられた島状シール部１７とから構成され、該島状シール部１７に前記切込部２１が形成されている。
【００１２】
該構成からなる請求項２記載の包装袋にあっては、島状シール部１７の切込部２１から背貼り部７の縁部７ａに向かって包装シート３を破断すると、その破断された包装シート３の両側に蒸気排出口２７が二箇所形成される。従って、被調理品Ａの加熱調理による蒸気が島状シール部１７の両側の蒸気通路２５を介して各蒸気排出口２７から排出されるため、万一被調理品Ａが蒸気通路２５に流入して一方の蒸気排出口２７から蒸気が排出できなくなっても、他方の蒸気排出口２７から蒸気を排出でき、袋本体１の破裂を防止することができる。
【００１５】
【発明の実施の形態】
以下、本願発明の一実施の形態について図面に従って説明する。
図１乃至図６において、１はチルド食品または冷凍食品等の被調理品Ａを包装するための袋本体で、この袋本体１は、二軸延伸ポリエステル、二軸延伸ポリアミド等のプラスチックフィルムを基材とし、最内層にポリエチレンやポリプロピレン等の熱融着性樹脂を積層したもの等の包装シート３から構成されている。尚、被調理品Ａとしては、例えば、出汁入りおでん、たれ付き豚角煮、麻姿豆腐、丼の具、たれ付き焼肉、カレーシチュー、スープ等の各種の食品が挙げられる。但し、図１乃至図３に示す袋本体は、被調理品Ａが収容されていない空の状態の包装袋を示す。
【００１６】
前記被調理品Ａを包装する袋本体１は、内面の熱融着性樹脂層同士が対向するように包装シート３が折畳まれており、該袋本体１は図１に示す如く平面視略方形状で周囲が密封された袋部５と、該包装シート３の中途部を二重に折畳んで、その折畳まれ重なり合った部位の内面同士を接着してなる背貼り部７とから構成されている。尚、本実施形態において、袋部５及び背貼り部７の横幅Ｌ１は１５０ｍｍで、袋部５の奥行きＬ２は２４０ｍｍであり、背貼り部７の上下高さＬ３は３０ｍｍに設けられている。
【００１７】
前記袋部５は、その方形状の周囲の包装シート３の内面同士を熱溶着することにより、被調理品Ａを収容する収容空間部９が内部に形成されている。
【００１８】
また、背貼り部７には、凹部（非シール部）を有するヒートシールバーで押圧等されることにより、包装シート３の内面同士が接着された接着部１１と、接着されない非接着部１３とが設けられており、該非接着部１３によって後述する蒸気通路２５が形成されることになる。
【００１９】
該背貼り部７の接着部１１は、図３に示すように背貼り部７の両側に設けられ、非接着部１３を外部と遮断（密封）する密封シール部１５と、背貼り部７の中央部分に密封シール部１５と離間して設けられた島状シール部１７とから構成されている。ここで島状シール部１７は、密封シール部１５よりもシール圧が低い状態でシールされ、密封シール部１５に比して接着力の弱い弱シール部として形成されている。
【００２０】
前記密封シール部１５は、その内側縁１５ａが下方から上方にかけて中央側に傾斜して設けられている。
【００２１】
前記島状シール部１７は、両側辺１７ａが下端１７ｂから上辺１７ｃにかけて外側に傾斜し全体として略逆三角形状の形状に形成されており、その下端１７ｂが袋部５と３ｍｍ程度（Ｌ４）離間し、その上辺１７ｃが背貼り部７の上縁７ａと５ｍｍ程度（Ｌ５）離間して設けられている。
【００２２】
２１は、背貼り部７の包装シート３を上縁７ａに向けて破断できるように、島状シール部１７に形成された略Ｕ字状の切込部であり、該切込部２１の包装シート３（摘み片２３）を把持して上方に引っ張ることにより、背貼り部７の包装シート３が破断して図３（ロ）の如く島状シール部１７の上方に二箇所の蒸気排出口２７を形成することができる。ここで、該切込部２１は重なり合う包装シート３を貫通する切れ目より形成されている。また該切込部２１はその上端部で側方に向けて若干延設された屈曲部２１ａが形成され、摘み片２３を把持しやすいよう構成されている。
【００２３】
また、該切込部２１の下端２１ｂは、島状シール部１７の下端１７ｂと３ｍｍ程度（Ｌ６）離間した位置に設けられている。
【００２４】
また、図中２５は被調理品Ａの加熱調理時に発生する蒸気を蒸気排出口２７まで通過せしめる蒸気通路であり、該蒸気通路２５は密封シール部１５の内側縁１５ａ及び島状シール部１７の側辺１７ａにより上方にかけて狭くなるように設けられている。
【００２５】
次に、収容空間部９に被調理品Ａを密封包装した包装袋を電子レンジで加熱調理する場合について説明する。
【００２６】
先ず、背貼り部７の摘み片２３を上方へ引っ張り上げて、蒸気排出口２７を形成する（図３（ロ）参照）。この蒸気排出口２７の形成に際し、切込部２１の摘み片２３を上方に引っ張ることで、背貼り部７の包装シート３を上縁７ａに向けて破断するものゆえ、収容空間部９側の包装シート３が破断することを防止できる。
【００２７】
そして、蒸気排出口２７が開口された袋本体１を電子レンジ内に入れて被調理品Ａを加熱すると、被調理品Ａの液体が蒸気となり、袋本体１内の圧力が上昇して袋本体１が膨張すると共に、蒸気は蒸気通路２５及び蒸気排出口２７を押し広げ、適宜排出されることとなる（図５参照）。
【００２８】
また、この加熱調理時に被調理品Ａが沸騰するようなことがあっても、蒸気排出口２７は島状シール部１７の上方で且つ膨張して最も高くなっている位置にあるため、被調理品Ａの液体が蒸気排出口２７から流出し難いという利点を有する。
【００２９】
さらに、蒸気排出口２７は二箇所に形成されるので、万一被調理品Ａの固形物等が一方側の蒸気排出口２７又は蒸気通路２５に入り閉塞しても、他方側の蒸気排出口２７より蒸気が排出されるため、内部圧力による袋本体１の破裂を防止できる。
【００３０】
しかも、上記実施形態の包装袋にあっては、上述の如き蒸気排出口２７の形成を忘れて電子レンジ内で調理した場合、被調理品Ａから発生する蒸気により収容空間部９内の圧力が高まり、袋本体１が図６（イ）のように変形（膨張）するが、収容空間部９内が一定圧以上に達すると、袋本体１に作用する変形（膨張）しようとする力により、弱シール部として形成された島状シール部１７の下端１７ｂの包装シート３同士が剥離され、かかる部位（剥離蒸気通路３３）の包装シート３間を蒸気が通過して、切込部２１の下端２１ｂ（排出口３１）から蒸気が排出される（図６（ロ）参照）。
特に、本実施形態においては島状シール部１７が略逆三角形の形状に形成されているので、袋本体１に作用する変形しようとする力は島状シール部１７の下端１７ａに作用しやすく、この下端１７ａの包装シート３同士が剥離され易い。
【００３１】
尚、本願発明は上記実施の形態に限定されるものではなく、袋本体１の形状等は被調理品Ａの種類に応じて任意に設計変更自在である。
また、上記実施形態においては、包装シート３の中途部を二重に折畳んで背貼り部７を形成するものについて説明したが、図７又は図８に示す如く包装シート３の端部の内面同士が重なり合うように折り畳み、この端部の内面同士を接着して背貼り部７を形成しても良い。さらに、一枚の包装シート３を折り畳んで製袋するもののみならず、三枚の包装シートを重ね合わせて接着することにより製袋することもできる。また、上記実施形態では、背貼り部７の上縁７ａの中央部分を接着しないものについて説明したが、図７又は図８に示す如く、背貼り部７の上縁７ａ部分も接着するものであっても良い。
【００３２】
さらに、上記実施形態では切込部２１を島状シール部１７に形成したために、蒸気排出口２７を二箇所形成できるものであったが、島状シール部１７を有さないものであっても、切込部２１が接着部１１に形成されているものであれば本願発明の意図する範囲内である。また、島状シール部１７を有する場合であっても該島状シール部１７に切込部２１を形成することは必須ではなく、例えば図７に示す如く収容空間部９に連通する第一蒸気通路２５ａと該第一蒸気通路２５ａの上方位置から背貼り部７の側方に延設された第二蒸気通路２５ｂとから蒸気通路２５が形成され、この第二蒸気通路２５ｂの下方の接着部１１（密封シール部１５）に切込部２１が形成された包装袋も本発明の意図する範囲内である。かかる包装袋にあっては、切込部２１の包装シート３（摘み片２３）を把持して上方に引き上げて、上縁７ａに向けて包装シート３を破断することで、第二蒸気通路２５ｂの一端部が開口され蒸気排出口２７が形成されるものである。
【００３３】
また、切込部２１の形状は、上記略Ｕ字状の形状に限定されるものでなく、Ｖ字状、倒コの字状等その他の形状も採用することができ、さらに切込部２１の包装シート３（摘み片２３）が上方に引き上げられるように設けられるものに限定されるものでもなく、要は蒸気排出口２７の形成に際し縁部７ａに向けて包装シート３を破断できるものであれば本願発明の意図する範囲内である。ここで、縁部７ａとは背貼り部７の側方の縁部をも含む。また、切込部２１からの包装シート３の破断が背貼り部７の縁部７ａまで達して、破断した包装シート３（摘み片２３）が袋本体１から離脱することは必要でなく、非接着部１３まで破断が至り蒸気通路２５と連通される蒸気排出口２７が形成されれば十分である。
【００３４】
さらに、島状シール部１７を形成する場合にあっても、島状シール部１７の形状等は上記実施形態のものに限定されるものではない。また、上記実施形態においては、島状シール部１７を弱シール部として形成することにより、蒸気排出口２７の形成を怠った場合においても収容空間部９内の圧力上昇により包装シート３同士の剥離が容易且つ確実に行なえるという利点を有するが、請求項３記載の発明はかかる構成に限定されるものではない。つまり、島状シール部１７を弱シール部とせずに他の接着部１１（密封シール部１５）と同様のシール圧で接着するものであっても、収容空間部９内の圧力上昇により剥離して排出口３１を形成するものであれば、請求項３記載の発明の意図する範囲内である。
【００３５】
さらに、上記実施形態では、排出口３１として切込部２１の下端２１ｂから蒸気が排出されるものについて説明したが、図７又は図８に示すように島状シール部１７に穿設孔３５を穿設して、該穿設孔３５から蒸気が排出されるよう構成することもできる。但し、上記実施形態の如く島状シール部１７の下端１７ｂから切込部２１まで包装シート３同士が剥離されて排出口３１が形成されるよう構成することが好ましく、これにより別途穿設孔等を形成する必要がないとともに切込部２１を大きく形成でき、切込部２１の包装シート３（摘み部２３）を把持し易いという利点を有する。
【００３６】
さらに、背貼り部７の密封シール部１５の具体的形状も上記実施形態のものに限定されるものではなく、収容空間部９に連通される蒸気通路２５（非接着部１３）を外部と遮断すべく接着されているものであれば良く、例えば図８に示す如く密封シール部１５に四方が囲まれた非接着部分１６を有することも可能である。
【００３７】
【発明の効果】
上述のように、本願発明の電子レンジ用包装袋は、加熱調理前に背貼り部の切込部から包装シートを破断して蒸気排出口を形成して、電子レンジで加熱調理を行なうことができ、特に蒸気排出口の形成に際して背貼り部の縁部に向かって包装シートを破断するものゆえ、収容空間部側の包装シートの破断を防止でき、容易且つ確実に蒸気排出口の形成を行なうことができるという効果を有する。
【図面の簡単な説明】
【図１】本願発明の一実施の形態を示す包装袋の斜視図。
【図２】同実施形態の包装袋の側面図。
【図３】同実施形態の包装袋の正面図で、（イ）は蒸気排出口形成前の包装袋で、（ロ）は蒸気排出口形成後を示す。
【図４】同実施形態の包装袋の蒸気排出口形成前の図３のＩ−Ｉ線断面図を示す。
【図５】同実施形態の包装袋の蒸気排出口形成後の断面図で、（イ）は図３のＩ−Ｉ線断面図、（ロ）は図３のＩＩ−ＩＩ線断面図を示す。
【図６】図３のＩ−Ｉ線断面図で、（イ）は蒸気排出口が形成されずに加熱調理された状態、（ロ）はその後に島状シール部の包装シートが剥離された状態を示す。
【図７】本願発明の他の実施の形態を示す斜視図。
【図８】本願発明の他の実施の形態を示し、（イ）は正面図、（ロ）は側面図。
【図９】従来の包装袋の斜視図。
【符号の説明】
１…袋本体、３…包装シート、５…袋部、７…背貼り部、７ａ…上縁（縁部）、９…収容空間部、１１…接着部、１３…非接着部、１５…密封シール部、１５ａ …内側縁、１７…島状シール部、１７ａ …側辺、１７ｂ …下端、１７ｃ …上辺、２１…切込部、２１ａ …屈曲部、２１ｂ …下端、２３…摘み部、２５…蒸気通路、２５ａ …第一蒸気通路、２５ｂ …第二蒸気通路、２７…蒸気排出口、３１…排出口、３３…剥離蒸気通路、３５…穿設孔[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag for a microwave oven that can store food so that the food can be cooked in a microwave oven.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an article to be cooked (particularly, a liquid substance) hermetically sealed in a packaging bag is limited to a cooking method using hot water heating, and when a microwave oven is used, the internal pressure increases due to moisture evaporated from the article to be cooked during cooking. Therefore, the packaging sheet may expand like a balloon and burst.
[0003]
Therefore, in the case of cooking in a microwave oven, it is necessary to devise a way to release steam without leaking liquid. Therefore, conventionally, a check valve is attached to the packaging bag, or a part of the packaging bag is cut with scissors immediately before cooking. I was doing.
[0004]
[Problems to be solved by the invention]
However, when a check valve is used, the function is incomplete or the cost is high, and it has not been widely used. In addition, there is a possibility that the liquid product may be boiled and spilled.
[0005]
Further, as shown in FIG. 9, the backing portion 7 'in which the inner surfaces of the pair of superposed packaging sheets 3 are bonded to each other with a bonding portion 11', and an accommodation space 9 'for accommodating a product to be cooked are provided. First and second steam passages 25a 'and 25b', to which the packaging sheet 3 'is not adhered to the back pasting portion 7', are provided in communication with the accommodation space 9 ', and are provided at the upper edge 7a' of the back pasting portion 7 '. A notch 21 'that can break the packaging sheet 3' downward (toward the accommodation space 9 'side) is formed, and the back steaming portion is located at a position opposite to the notch 21' with respect to the second steam passage 25b '. It is also conceivable to provide a notch 22 'for stopper formed in a direction perpendicular to the breaking direction of 7'. When the article to be cooked contained in the packaging bag is cooked by heating, the packaging sheet 3 'is cut in advance from the notch 21' and one end of the second steam passage 25b 'is opened as a steam discharge port. Since the steam generated by cooking is discharged to the outside from the steam outlet through the first and second steam passages 25a 'and 25b', the object to be cooked can be easily cooked using a microwave oven.
[0006]
Such a packaging bag is configured such that when the packaging sheet 3 'is broken from the notch 21' of the upper edge 7a 'of the back affixing portion 7' to form a vapor discharge port, the breaking is stopped by the notch 22 'for stopper. However, in the case where the breaking direction is shifted or the breaking force is too strong, the packaging sheet 3 ′ below the notch 22 ′ for the stopper and further to the packaging sheet 3 ′ in the accommodation space 9 ′. There was a possibility that the product could break due to breakage.
[0007]
Further, when the article to be cooked is heated and cooked, the article to be cooked enters the second steam passage 25b ', and the steam passage 25' is closed, so that the bag body 1 'may burst due to the internal pressure. Was. In addition, even when heating and cooking is performed without breaking the cutout 21 '(forming the steam discharge port), the bag body 1' may be ruptured.
[0008]
The present invention has been made in view of the above-mentioned conventional problems. A first object of the present invention is to facilitate formation of a steam discharge port, and a second object is to heat with a microwave oven. The steam generated from the article to be cooked during cooking can be efficiently discharged to prevent the rupture of the bag body, and the third problem is that the rupture of the bag body can be prevented even if the steam outlet is forgotten. It is an object of the present invention to provide a packaging bag for a microwave oven, which can prevent the occurrence of the problem.
[0009]
[Means for Solving the Problems]
The present invention has been made to solve the above first and third problems, and a packaging bag for a microwave oven according to the present invention has an inner surface of a pair of stacked packaging sheets 3 bonded together by an adhesive portion 11. In a packaging bag for a microwave oven having a back-attached portion 7 formed as described above and a storage space 9 in which the article to be cooked A is stored, the back-pasted portion 7 has a steam passage 25 communicating with the storage space 9. In order to form a steam outlet 27 communicating with the steam passage 25 at the bonding portion 11 of the back pasting portion 7, the packaging sheet of the back pasting portion 7 is directed toward the edge 7 a of the back pasting portion 7. 3 is formed notch 21 for breaking the adhesion section 11, and the sealing seal 15 for blocking the outside the steam passage 25, provided separately from the said sealing seal 15 Island it consists Jo seal portion 17., island-like seal portion 17 is heated without formation of vapor outlet 27 Upon physical, characterized in that the discharge opening 31 is peeled off by a pressure rise in the housing space 9 is made is configured to be formed.
[0010]
The microwave packaging bag according to the present invention having the above-described configuration is configured such that, when heating the food A to be stored in the storage space 9, the cutout 21 of the back affixing portion 7 faces the edge 7a in advance. By breaking the packaging sheet 3, the steam discharge port 27 can be formed, and the packaging sheet 3 on the accommodation space 9 side does not break. In addition, even when the user heats and cooks without rupture from the cut portion 21 ( formation of the steam outlet 27 ) , the pressure in the housing space 9 increases due to the steam generated by the heating of the article A to be cooked. it is, is the outlet 31 is formed in an island shaped seal portion 17, the interior of the steam is discharged from the exhaust port 31 to the outside, it can be prevented bursting of the bag body 1.
[0011]
Further, the present invention can employ the configuration as set forth in claim 2 in order to solve the second problem. In other words, the invention according to claim 2 of the present application includes the sealing portion 15 for blocking the steam passage 25 from the outside by the adhesive portion 11 and the island-shaped sealing portion 17 provided separately from the sealing portion 15. The cut-out portion 21 is formed in the island-shaped seal portion 17.
[0012]
In the packaging bag according to the second aspect of the present invention, when the packaging sheet 3 is broken from the cut portion 21 of the island-shaped seal portion 17 toward the edge 7a of the back pasting portion 7, the broken packaging is obtained. Two steam outlets 27 are formed on both sides of the sheet 3. Accordingly, since the steam produced by the cooking of the cooked product A is discharged from the steam outlets 27 through the steam passages 25 on both sides of the island-shaped seal portion 17, the cooked product A flows into the steam passage 25. Even if steam cannot be discharged from one of the steam discharge ports 27, steam can be discharged from the other steam discharge port 27, and the rupture of the bag body 1 can be prevented.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 6, reference numeral 1 denotes a bag body for packaging an article to be cooked A such as chilled food or frozen food, and the bag body 1 is made of a plastic film such as biaxially stretched polyester or biaxially stretched polyamide. The innermost layer is made of a packaging sheet 3 made of a heat-fusible resin such as polyethylene or polypropylene laminated on the innermost layer. Examples of the food to be cooked A include various foods such as oden with dashi, pork stew with sauce, hemp figure tofu, bowl ingredients, grilled meat with sauce, curry stew, and soup. However, the bag body shown in FIGS. 1 to 3 shows an empty packaging bag in which the article to be cooked A is not stored.
[0016]
In the bag body 1 for packaging the article to be cooked A, the packaging sheet 3 is folded such that the heat-fusible resin layers on the inner surface face each other. As shown in FIG. A bag portion 5 having a rectangular shape and the periphery thereof being sealed, and a back adhering portion 7 formed by folding the middle portion of the packaging sheet 3 doubly and bonding the inner surfaces of the folded and overlapped portions. Have been. In the present embodiment, the width L1 of the bag portion 5 and the back portion 7 is 150 mm, the depth L2 of the bag portion 5 is 240 mm, and the vertical height L3 of the back portion 7 is 30 mm.
[0017]
The bag portion 5 has an accommodation space 9 for accommodating the product A to be cooked therein by heat-welding the inner surfaces of the surrounding packaging sheet 3 to each other.
[0018]
Further, the back bonding portion 7 is pressed with a heat seal bar having a concave portion (non-sealing portion) to form an adhesive portion 11 in which the inner surfaces of the packaging sheet 3 are bonded to each other, and a non-bonding portion 13 which is not bonded. Is provided, and the non-adhesive portion 13 forms a steam passage 25 described later.
[0019]
As shown in FIG. 3, the bonding portion 11 of the back bonding portion 7 is provided on both sides of the back bonding portion 7, and a sealing seal portion 15 for blocking (sealing) the non-bonding portion 13 from the outside, It is composed of a hermetic seal portion 15 and an island-shaped seal portion 17 provided separately from each other at a central portion. Here, the island-shaped seal portion 17 is sealed in a state where the sealing pressure is lower than that of the hermetic seal portion 15, and is formed as a weak seal portion having a weaker adhesive force than the hermetic seal portion 15.
[0020]
The hermetic seal portion 15 is provided such that its inner edge 15a is inclined toward the center from below to above.
[0021]
The island-shaped seal portion 17 has both sides 17a inclined outward from the lower end 17b to the upper side 17c, and is formed in a substantially inverted triangular shape as a whole. The upper side 17c is provided at a distance of about 5 mm (L5) from the upper edge 7a of the back pasting portion 7.
[0022]
Reference numeral 21 denotes a substantially U-shaped cut portion formed in the island-shaped seal portion 17 so that the packaging sheet 3 of the back pasting portion 7 can be broken toward the upper edge 7a. By gripping the sheet 3 (knob piece 23) and pulling it upward, the packaging sheet 3 of the back affixing portion 7 is broken, and two steam outlets are provided above the island-shaped seal portion 17 as shown in FIG. 27 can be formed. Here, the cut portion 21 is formed by a cut penetrating the overlapping packaging sheets 3. The cut portion 21 is formed with a bent portion 21a slightly extending laterally at an upper end thereof, so that the knob 23 can be easily gripped.
[0023]
The lower end 21b of the cut portion 21 is provided at a position separated from the lower end 17b of the island-shaped seal portion 17 by about 3 mm (L6).
[0024]
In the drawing, reference numeral 25 denotes a steam passage for passing steam generated during heating and cooking of the article to be cooked A to the steam discharge port 27. The steam passage 25 is formed between the inner edge 15a of the hermetic seal portion 15 and the island-like seal portion 17. It is provided so that it may become narrower upward by the side 17a.
[0025]
Next, a case where the packaging bag in which the article to be cooked A is hermetically sealed in the accommodation space 9 is heated and cooked in a microwave oven will be described.
[0026]
First, the tab 23 of the back affixing portion 7 is pulled upward to form a steam discharge port 27 (see FIG. 3B). In forming the steam discharge port 27, the packaging sheet 3 of the back pasting section 7 is broken toward the upper edge 7a by pulling the knob 23 of the cut section 21 upward. The packaging sheet 3 can be prevented from breaking.
[0027]
Then, when the bag body 1 with the steam outlet 27 opened is placed in a microwave oven to heat the article to be cooked A, the liquid in the article to be cooked A becomes steam, and the pressure in the bag body 1 rises to increase the pressure in the bag body 1. As 1 expands, the steam expands the steam passage 25 and the steam outlet 27, and is appropriately discharged (see FIG. 5).
[0028]
In addition, even if the article A to be cooked may be boiled during the heating cooking, the steam outlet 27 is located above the island-shaped seal portion 17 and at the position where it expands and is at the highest position. This has the advantage that the liquid of the product A is unlikely to flow out of the vapor discharge port 27.
[0029]
Further, since the steam discharge port 27 is formed at two places, even if a solid or the like of the article to be cooked A enters the steam discharge port 27 on one side or the steam passage 25 and is blocked, the steam discharge port on the other side Since the steam is discharged from 27, the rupture of the bag body 1 due to the internal pressure can be prevented.
[0030]
Moreover, in the packaging bag of the above embodiment, if the cooking in the microwave oven is performed by omitting the formation of the steam discharge port 27 as described above, the pressure generated in the storage space 9 due to the steam generated from the article A to be cooked is reduced. 6A, the bag body 1 is deformed (expanded) as shown in FIG. 6A. However, when the pressure inside the storage space 9 reaches a certain pressure or more, the bag body 1 is deformed (expanded) by a force acting on the bag body 1. The packaging sheets 3 at the lower end 17b of the island-shaped seal portion 17 formed as a weak seal portion are peeled off from each other, and steam passes between the packaging sheets 3 at such a portion (peeling steam passage 33). Steam is discharged from 21b (discharge port 31) (see FIG. 6B).
In particular, in the present embodiment, since the island-shaped seal portion 17 is formed in a substantially inverted triangular shape, the deforming force acting on the bag body 1 easily acts on the lower end 17a of the island-shaped seal portion 17, The packaging sheets 3 at the lower end 17a are easily separated from each other.
[0031]
The present invention is not limited to the above embodiment, and the shape and the like of the bag body 1 can be arbitrarily changed according to the type of the article A to be cooked.
Further, in the above-described embodiment, the case where the middle part of the packaging sheet 3 is double-folded to form the back pasting portion 7 has been described. However, as shown in FIG. 7 or FIG. It may be folded so as to overlap with each other, and the inner surfaces of the ends may be adhered to each other to form the back bonding portion 7. Further, not only a single packaging sheet 3 may be folded to make a bag, but also a three-packaging sheet may be stacked and adhered to make a bag. Further, in the above embodiment, the case where the central portion of the upper edge 7a of the back pasting portion 7 is not bonded is described. However, as shown in FIG. 7 or 8, the upper edge 7a portion of the back pasting portion 7 is also bonded. There may be.
[0032]
Furthermore, in the above-described embodiment, the cutout portion 21 is formed in the island-shaped seal portion 17, so that the steam discharge port 27 can be formed in two places. If the cut portion 21 is formed in the bonding portion 11, it is within the range intended by the present invention. Also, even when the island-shaped seal portion 17 is provided, it is not essential to form the cut portion 21 in the island-shaped seal portion 17, and for example, the first steam communicating with the accommodation space 9 as shown in FIG. A steam passage 25 is formed by the passage 25a and a second steam passage 25b extending from the position above the first steam passage 25a to the side of the back pasting portion 7, and a bonding portion below the second steam passage 25b is formed. A packaging bag in which the cutout portion 21 is formed in 11 (sealed seal portion 15) is also within the range intended by the present invention. In such a packaging bag, the packaging sheet 3 (knob piece 23) of the cut portion 21 is gripped and pulled up to break the packaging sheet 3 toward the upper edge 7a, so that the second steam passage 25b Is opened at one end to form a steam discharge port 27.
[0033]
In addition, the shape of the cut portion 21 is not limited to the above-described substantially U-shaped shape, and other shapes such as a V-shape and a inverted U-shape can be adopted. However, the present invention is not limited to the one provided so that the packaging sheet 3 (knob piece 23) can be lifted upward, and the point is that the packaging sheet 3 can be broken toward the edge 7a when the steam discharge port 27 is formed. If there is, it is within the range intended by the present invention. Here, the edge portion 7a includes a side edge portion of the back pasting portion 7. Further, it is not necessary that the rupture of the packaging sheet 3 from the cut portion 21 reaches the edge 7a of the back pasting portion 7 and the broken packaging sheet 3 (knob piece 23) is detached from the bag body 1; It suffices that a steam outlet 27 which is broken up to the bonding portion 13 and communicates with the steam passage 25 is formed.
[0034]
Further, even when the island-shaped seal portion 17 is formed, the shape and the like of the island-shaped seal portion 17 are not limited to those in the above-described embodiment. Further, in the above embodiment, the island-shaped seal portion 17 is formed as a weak seal portion, so that even when the formation of the steam discharge port 27 is neglected, the packaging sheets 3 are separated from each other due to a rise in pressure in the housing space portion 9. Has the advantage that it can be performed easily and reliably, but the invention according to claim 3 is not limited to such a configuration. In other words, even if the island-shaped seal portion 17 is not weakly sealed and is bonded with the same sealing pressure as the other bonded portion 11 (sealed seal portion 15), the island-shaped seal portion 17 is peeled off due to a rise in the pressure in the housing space 9. As long as the discharge port 31 is formed by the above method, it is within the intended range of the invention described in claim 3.
[0035]
Further, in the above-described embodiment, a description has been given of a case where steam is discharged from the lower end 21b of the cut portion 21 as the discharge port 31. However, as shown in FIG. 7 or FIG. It may be configured such that steam is discharged from the drilled hole 35 by drilling. However, as in the above-described embodiment, it is preferable that the packaging sheet 3 is peeled from the lower end 17b of the island-shaped seal portion 17 to the cutout portion 21 to form the discharge port 31. And the notch 21 can be formed large, and the packaging sheet 3 (the knob 23) of the notch 21 can be easily gripped.
[0036]
Further, the specific shape of the hermetic seal portion 15 of the back pasting portion 7 is not limited to that of the above-described embodiment, and the vapor passage 25 (non-adhesive portion 13) communicating with the housing space 9 is shut off from the outside. Any material may be used as long as it is adhered as much as possible, and for example, as shown in FIG.
[0037]
【The invention's effect】
As described above, the packaging bag for a microwave oven of the present invention is capable of performing a cooking process in a microwave oven by forming a steam discharge port by breaking the packaging sheet from the cut portion of the back pasting portion before cooking. In particular, since the packaging sheet is broken toward the edge of the backing portion when forming the steam discharge port, breakage of the packaging sheet on the accommodation space side can be prevented, and the steam discharge port can be formed easily and reliably. It has the effect of being able to.
[Brief description of the drawings]
FIG. 1 is a perspective view of a packaging bag showing an embodiment of the present invention.
FIG. 2 is a side view of the packaging bag of the embodiment.
FIG. 3 is a front view of the packaging bag according to the embodiment, in which (a) is a packaging bag before a steam outlet is formed, and (b) is after the steam outlet is formed.
FIG. 4 is a cross-sectional view taken along the line II of FIG. 3 before forming a steam outlet of the packaging bag of the embodiment.
5A and 5B are cross-sectional views of the packaging bag of the embodiment after the formation of a steam discharge port. FIG. 5A is a cross-sectional view taken along line II of FIG. 3, and FIG. 5B is a cross-sectional view taken along line II-II of FIG. .
FIG. 6 is a cross-sectional view taken along the line II of FIG. 3, wherein (a) is a state in which heating and cooking are performed without forming a steam discharge port, and (b) is a package sheet of an island-shaped seal portion thereafter peeled off. Indicates the status.
FIG. 7 is a perspective view showing another embodiment of the present invention.
8A and 8B show another embodiment of the present invention, wherein FIG. 8A is a front view and FIG. 8B is a side view.
FIG. 9 is a perspective view of a conventional packaging bag.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... bag main body, 3 ... packaging sheet, 5 ... bag part, 7 ... back part, 7a ... upper edge (edge part), 9 ... accommodation space part, 11 ... adhesion part, 13 ... non-adhesion part, 15 ... sealing Seal portion, 15a Inner edge, 17 Island-shaped seal portion, 17a Side edge, 17b Lower end, 17c Upper edge, 21 Cut portion, 21a Bending portion, 21b Lower end, 23 Knob, 25 ... Steam passage, 25a first steam passage, 25b second steam passage, 27 steam outlet, 31 outlet, 33 peeling steam passage, 35 drilled hole

Claims

A backing part (7) formed by bonding the inner surfaces of a pair of stacked packaging sheets (3) to each other with a bonding part (11), and a storage space (9) for storing the article to be cooked (A). In the packaging bag for a microwave oven having the above, the back pasting portion (7) is formed with a steam passage (25) communicating with the accommodation space portion (9), and furthermore, the backing portion (7) is bonded to the bonding portion (11). In order to form a steam discharge port (27) communicating with the steam passage (25), the wrapping sheet (3) of the back pasted portion (7) is directed toward the edge (7a) of the back pasted portion (7). notch for breaking (21) is formed, said adhesive portion (11), the hermetic seal portion for blocking the vapor passage (25) and external (15), said sealing seal section (15 ) and it is configured from island-like seal portion provided with (17) spaced, island-like seal portion (17), when cooked without formation of vapor outlet (27), The discharge port (31) is formed by peeling off due to the pressure increase in the accommodation space (9) . A packaging bag for a microwave oven, characterized in that it is configured as follows .

The packaging bag for a microwave oven according to claim 1, wherein the cut portion (21) is formed in the island- shaped seal portion (17).