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JP4364560B2 - How to improve the texture of frozen foods - Google Patents
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JP4364560B2 - How to improve the texture of frozen foods - Google Patents

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JP4364560B2
JP4364560B2 JP2003168338A JP2003168338A JP4364560B2 JP 4364560 B2 JP4364560 B2 JP 4364560B2 JP 2003168338 A JP2003168338 A JP 2003168338A JP 2003168338 A JP2003168338 A JP 2003168338A JP 4364560 B2 JP4364560 B2 JP 4364560B2
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frozen food
tray
texture
frozen
food
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JP2005001726A (en
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雄三 府川
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Japan Tobacco Inc
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Japan Tobacco Inc
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Description

【0001】
【発明の属する技術分野】
本発明は、冷凍食品、特に調理済み冷凍食品の包装に使用され、製造、流通、保管中に冷凍食品の皮や衣への余分な水分の吸着、吸収を軽減、防止し、電子レンジ加熱後に食感の良い食品を提供し得る冷凍食品包装用トレー及び該冷凍食品包装用トレーを用いて包装した冷凍食品包装体に関する。
【0002】
【従来の技術】
従来、冷凍食品、特に調理済み冷凍食品をトレーに収容し、これを包装袋に入れて密封包装した形態の冷凍食品包装体が提供されている。
図7は、従来の冷凍食品包装体の一例を示す図であり、この冷凍食品包装体1は、複数の食品収容凹部5を有するプラスチック製のトレー2に冷凍食品3を収容し、このトレー2を透湿性の低いプラスチックフィルムからなる包装袋4に入れ、この包装袋4を密封して構成されている。
また、前述したようなプラスチック製のトレーを用い、油調処理済み冷凍食品を包装し、電子レンジ加熱時に必要な分だけ加熱できる電子レンジ調理用食品包装体が提案されている(例えば、特許文献1参照。)。
【0003】
ところで、前述のように調理済み食品、特に油で揚げた春巻などの油調処理済み冷凍食品を電子レンジ加熱して食する際、冷凍食品の皮や衣に余分な水分が多く含まれていると、電子レンジ加熱後に皮や衣がベタついて、本来のパリッとした食感が得られない問題がある。従って、春巻などの油調処理済み冷凍食品については、電子レンジ加熱後に良好な食感を得るために、皮や衣に余分な水分が吸着されない状態で冷凍保存されることが望ましい。冷凍食品包装体の製造、流通または保管中に、冷凍食品の皮や衣に余分な水分が吸着されてしまう原因としては、食品内部の不凍水の浸透、氷結晶の昇華などによる食品の皮や衣への水分移行、包装冷凍食品内の残存水蒸気や再凍結による食品外部からの水分移行などが考えられる。
従来、冷凍食品の余分な水分を取り除く方法としては、冷凍前の食品にシート状の吸水用具を接触させた状態で冷凍保存する方法が提案されている(例えば、特許文献2参照。)。
また、食品と接する内層に水分を通過させる疎水性繊維シート、中間層に水分を吸収して保持する吸収性繊維シート、外層に不透水性のプラスチック製フィルムを積層してなる積層シートにより構成され、疎水性繊維シートの平均繊維間距離が35μm以上であり、かつ積層シートとしての透湿度が100g/mday以下、内層からの吸水量が100〜500g/mである食品加熱調理用包装体が提案されている。
【0004】
【特許文献1】
特開平10−278974号公報
【特許文献2】
特開平9−294531号公報
【特許文献3】
特開平7−132974号公報
【0005】
【発明が解決しようとする課題】
しかしながら、前述した従来技術には、次のような問題があった。
特許文献1に記載された技術は、プラスチック製のトレーを冷凍食品の包装に用いており、この冷凍食品包装体の流通、保存時に、食品内部の不凍水の浸透、氷結晶の昇華などによる食品の皮や衣への水分移行、包装冷凍食品内の残存水蒸気や再凍結による食品外部からの水分移行などによって、冷凍食品の皮や衣に余分な水分が吸着されてしまい、特に油で揚げた春巻などの油調処理済み冷凍食品を包装したものでは、電子レンジ加熱後に皮や衣がベタついて、本来のパリッとした食感が得られない問題がある。
また、特許文献2に記載された技術は、包装の対象となる食品が魚介類、肉類であり、電子レンジ加熱を行う調理済み食品ではなく、この種の冷凍食品における電子レンジ加熱後の食感向上に有効であることは一切記載されていない。また特許文献2は、凍結前の食品の水分を吸水用具で吸収し、その後食品を冷凍するための技術であり、流通、保存時に冷凍食品の皮や衣への余分な水分の吸着防止を目的としたものではない。
さらに、特許文献3に記載された技術は、食品を電子レンジで加熱する時に食品を包装し、電子加熱調理時に発生するドリップや結露等で食品がベタつくのを防止するためのものであり、流通、保存時に冷凍食品の皮や衣への余分な水分の吸着防止を目的としたものではない。また特許文献3では、袋状に形成した積層シート内に食品を入れて電子レンジ加熱しており、このような方法では食品が変形したり、壊れ易い問題がある。さらに、このような積層シートは、密封し難く、また油調食品を包装した際に油じみが生じ易いために、この種の食品の包装用資材としては好ましくない。
【0006】
本発明は前記事情に鑑みてなされたもので、製造、流通、保管中に冷凍食品の皮や衣への余分な水分の吸着、吸収を軽減、防止し、電子レンジ加熱後に食感の良い食品を提供し得る冷凍食品包装用トレー及び該冷凍食品包装用トレーを用いて包装した冷凍食品包装体の提供を目的とする。
【0007】
【課題を解決するための手段】
前記目的を達成するために本発明は、冷凍食品をトレーに収容し、これを包装袋に入れて密封包装した冷凍食品包装体における冷凍食品の食感改善方法であって、
前記トレーとして、冷凍食品と接する少なくとも一部が20〜500g/m の吸水度を有する冷凍食品包装用トレーを用い、冷凍食品包装体の流通、保管時に、冷凍食品の皮や衣への余分な水分の吸着を軽減または防止して、冷凍食品を電子レンジ加熱した食品の食感を改善することを特徴とする冷凍食品の食感改善方法を提供する。
前記冷凍食品包装用トレーは、底部と、その周縁から立設された側壁部とを有し、上側が開口した構造としてよい。
または前記冷凍食品包装用トレーは、底部と、その周縁から立設された側壁部とを有し、かつ上側の開口を塞ぐ蓋部とトレー内に収容された冷凍食品を整列させる中仕切りとのいずれか一方または両方を有する構造としてもよい。
また前記冷凍食品包装用トレーは、冷凍食品を収容する少なくとも1つの食品収容凹部を有するプラスチック製のトレー本体と、該トレー本体の冷凍食品と接する少なくとも一部に取り付けられた20〜500g/mの吸水度を有する吸水材とからなるものであってもよい
前記冷凍食品包装用トレーは、複数個の冷凍食品が収容され、個々の冷凍食品の収容部分を他部から切り離し可能な弱化線を設けてもよい。
記包装袋は、プラスチックフィルムからなるものか、またはプラスチックフィルムからなる外層と、20〜500g/mの吸水度を有する素材からなる内層とを有する積層シートからなるものが好ましい。
【0008】
【発明の実施の形態】
以下、図面を参照して本発明の実施形態を説明する。
図1,2は本発明の第1の実施形態を示す図であり、これらの図中符号10は冷凍食品包装体、11は冷凍食品包装用トレー(以下、トレーと略記する。)、12は冷凍食品、13は包装袋である。
この冷凍食品包装体10は、トレー11と、該トレー11に収容された冷凍食品12と、該冷凍食品12を収容したトレー11を覆って包装する包装袋13とを備えた構成になっている。
【0009】
このトレー11は、平板状の底部14と、その周縁から立設された側壁部15とからなり、冷凍食品と接する部分(以下、内面と記す。)が20〜500g/mの吸水度を有し、上側の開口部16から冷凍食品12を出し入れする構造になっている。このトレー11に使用する素材としては、紙、加工紙、不織布などが挙げられ、それぞれを単独で、あるいは2種以上を貼り合わせた積層体として用いることができる。
【0010】
本発明において、トレーの「吸水度」とは、JIS P 8140 紙及び板紙−吸水度試験法−コッブ法に記載された方法またはJIS P 8141 紙及び板紙のクレム法による吸水度試験方法に記載された方法に従って測定された吸水度のことである。
【0011】
本発明に係るトレーは種々の方法で作製でき、例えば絞り加工、モールディング成形法、平紙組み立てなどの従来周知の方法で作製できる。図1,2に示す第1の実施形態のトレー11は、適当な厚さの紙を所定形状に裁断し、側壁部15を折り曲げ、糊代部分にホットメルト接着剤などの接着剤を塗布し、箱状に組み立てて糊代部分を側壁部15外面の所定位置に接着することで作製される。
【0012】
このトレー11は、冷凍食品と接する内面が20〜500g/m、より好ましくは40〜300g/mの吸水度を有するものなので、このトレー11に冷凍食品12を収容して包装袋13で密封した冷凍食品包装体10の流通、保管時に、冷凍食品12の皮や衣への余分な水分の吸着を軽減または防止できる。このトレー11の内面の吸水度が20g/m未満であると、このトレー11による水分吸収が不十分となり、流通、保存時に冷凍食品12の皮や衣に余分な水分が吸収され易くなり、電子レンジ調理後に食品の皮や衣がベタついて食感を悪化させる可能性がある。一方、トレー11内面の吸水度が500g/mを超えると、冷凍食品12の水分や油分が必要以上に吸収されてしまい、食品の食感が悪くなる可能性がある。
【0013】
このトレー11の冷凍食品12と接していない外面は、前記内面と同様に20〜500g/mの吸水度を有していてもよいし、パラフィンなどの防水剤を塗布したり、プラスチックフィルムを貼り合わせて防水加工を施してもよい。また、外面には所望の着色や印刷を施すこともできる。
【0014】
このトレー11に収容される冷凍食品12は特に限定されないが、調理済み食品、特に油で揚げた春巻、コロッケ、エビフライ、フライドポテト、フライドチキン、カツなどの油調処理済み冷凍食品は、トレー11により水分が吸収され、食品の皮や衣に余分な水分が吸着され難くなり、電子レンジ加熱後に良好な食感が維持されることから、本発明による食感改善効果が高い。
【0015】
前記包装袋13は、プラスチックフィルム、好ましくは従来より冷凍食品の包装用に用いられている透湿性の低いプラスチックフィルムを袋状に成形したものが用いられる。この包装袋13は、従来公知のピロー包装法などによって、冷凍食品12を収容したトレー11を入れ、密封包装される。この包装形態は、トレー11の大きさや形状に応じて適宜設定でき、通常は横ピロー包装される。
【0016】
この冷凍食品包装体10は、冷凍食品12と接する内面が20〜500g/mの吸水度を有するトレーを用いたものなので、このトレー11に冷凍食品12を収容し密封した冷凍食品包装体10の流通、保管時に、冷凍食品12の皮や衣への余分な水分の吸着を軽減または防止でき、冷凍食品12を電子レンジ加熱した食品の食感を向上させることができる。また、このトレー11は、冷凍食品12を収容した状態で、そのまま電子レンジ加熱を行うことができ、加熱時に水分、油分を吸収して調理食品の食感を向上させることができる。
【0017】
図3は本発明の第2の実施形態を示す図であり、この図中符号21はトレーである。このトレー21は、平板状の底部22と、その周縁から立設された側壁部23と、上側の開口を塞ぐ蓋部24と、トレー21内に収容された冷凍食品12を整列させる中仕切り25とを有する構造になっている。
【0018】
このトレー21は、少なくとも冷凍食品12と接する蓋部24と中仕切り25の部分が20〜500g/mの吸水度を有する紙からなっている。蓋部24は、側壁部23の一部を延長し、側壁部23とその延長部分の境界を折り曲げて形成されている。また蓋部24の先端部は折り曲げられ、蓋部24を閉じる際にトレー本体側に差し込まれるようになっている。また中仕切り25は、冷凍食品12を安定して収容できるように、複数の円弧状収容溝を連ねた形状に成形されている。この中仕切り25は、側壁部23を延長して前記形状に加工した後、トレー内に治める方向に折り曲げることで形成することができ、あるいは別途作製した中仕切り25を、底部22と側壁部23と蓋部24とからなるトレー本体内に挿入することもできる。
【0019】
本実施形態のトレー21は、中仕切り25に冷凍食品12を載せ、蓋部24で開口を塞ぐことができるので、トレー21による冷凍食品12の余分な水分の吸着が確実なものとなり、電子レンジ加熱後の食品の食感がさらに向上する。また、中仕切り25に冷凍食品12を載せ、蓋部24で開口を塞ぐことで、冷凍食品12が壊れ難くなり、外観を良好に保つことができる。
【0020】
このトレー21において、個々の冷凍食品12の収容部分を他部から切り離し可能な構成とすることが好ましい。具体的には、図7中のトレー2に点線で示したようにミシン目などの弱化線を設け、その弱化線に沿って1つの収容部分を切り離し可能とする。このように個々の冷凍食品12の収容部分をそれぞれ切り離し可能とすることで、必要な個数だけ冷凍食品の収容部分を切り離して電子レンジでそのまま加熱し、残りはそのまま冷凍保存しておくことができる。
【0021】
図4は本発明の第3の実施形態を示す図であり、この図中符号31はトレーである。このトレー31は、厚紙を絞り加工し、平板状の底部32と、その周縁から立設された側壁部33とからなる皿状に形成されている。側壁部33の先端は、外向きに折り曲げてフランジ部34が設けられている。なお、本例示ではトレー31の底部32を平板状としているが、冷凍食品12を整列するために1つ以上の凸条をトレーの絞り加工と同時に設けることもできる。
【0022】
このトレー31およびこれを用いて包装した冷凍食品包装体は、第1の実施形態と同様の効果が得られる他、トレー31を皿状としたので、見栄えが良くなり、電子レンジ加熱したトレー31をそのまま食卓に出すことができる。
【0023】
図5は本発明の第4の実施形態を示す図であり、この図中符号41はトレーである。このトレー41は、モールディング成形法によって作製され、平板状の底部42と、その周縁から立設された側壁部43と、側壁部43先端から外側に向けて水平に延び出し、長手方向両側に把手部45を有するフランジ部44とを備えた皿状に形成されている。なお、本例示ではトレー41の底部42を平板状としているが、冷凍食品12を整列するために1つ以上の凸条をトレーのモールディング成形と同時に設けることもできる。
【0024】
このトレー41およびこれを用いて包装した冷凍食品包装体は、第1の実施形態と同様の効果が得られる他、トレー41を皿状としたので、見栄えが良くなり、電子レンジ加熱したトレー41をそのまま食卓に出すことができる。
【0025】
図6は本発明の第5の実施形態を示す図であり、この図中符号50は冷凍食品包装体、51は包装袋である、この包装袋51は、外層側のプラスチックフィルム52と、20〜500g/mの吸水度を有する内層側の吸水シート53とを貼り合わせた積層シートで作られている。この吸水シート53は、紙、加工紙、不織布を単層で、または2種以上を貼り合わせたシートなどが用いられる。
【0026】
この冷凍食品包装体50は、吸水性を有する包装袋でトレー11,21,31または41を包装したものなので、トレー11,21,31または41による食品の余分な水分、油分の吸収に加えて、包装袋51も食品の余分な水分、油分を吸収することができ、加熱調理した食品の食感がさらに向上する。
【0027】
なお、本発明のトレー及び冷凍食品包装体は、前述した各実施形態における例示に限定されることなく、種々の変更が可能である。
例えば、図7に示したプラスチック製のトレー2の少なくとも食品収容凹部5内面側に20〜500g/mの吸水度を有する紙などの素材からなる吸水材を貼り合わせ、吸水性のあるトレーを構成することもできる。
【0028】
【実施例】
食品としてフライ調理済みの春巻を使用し、下記の実施例1〜5、比較例1,2の包装仕様で包装し、−10℃で保存した。
【0029】
[実施例1]
80g/mの吸水度を有する紙を用い、図1,2に示す形状のトレーを作製した。このトレーに冷凍された春巻を収容し、プラスチックフィルムでピロー包装を行い、これを−10℃の条件で保存した。
【0030】
[実施例2]
200g/mの吸水度を有する紙を用い、図1,2に示す形状のトレーを作製した。このトレーに冷凍された春巻を収容し、プラスチックフィルムでピロー包装を行い、これを−10℃の条件で保存した。
【0031】
[実施例3]
80g/mの吸水度を有する紙を用い、中仕切りを有する形状のトレーを作製した。このトレーに冷凍された春巻を収容し、プラスチックフィルムでピロー包装を行い、これを−10℃の条件で保存した。
【0032】
[実施例4]
80g/mの吸水度を有する紙を用い、図3に示すように、蓋部と中仕切りを有する形状のトレーを作製した。このトレーに冷凍された春巻を収容し、プラスチックフィルムでピロー包装を行い、これを−10℃の条件で保存した。
【0033】
[実施例5]
80g/mの吸水度を有する紙を用い、図3に示すように、蓋部と中仕切りを有する形状のトレーを作製した。このトレーに冷凍された春巻を収容し、吸水性のある積層シートでピロー包装を行い、これを−10℃の条件で保存した。吸水性のある積層シートは、不織布、紙及びプラスチックフィルムを貼り合わせ、不織布側をトレーに接する向きにして用いた。
【0034】
[比較例1]
ポリプロピレン樹脂を成形した図7に示す形状のプラスチック製トレーに冷凍された春巻を収容し、プラスチックフィルムでピロー包装を行い、これを−10℃の条件で保存した。
【0035】
[比較例2]
5g/mの吸水度を有する紙を用い、図1,2に示す形状のトレーを作製した。このトレーに冷凍された春巻を収容し、プラスチックフィルムでピロー包装を行い、これを−10℃の条件で保存した。
【0036】
[比較例3]
ポリプロピレン樹脂を成形した図7に示す形状のプラスチック製トレーに冷凍された春巻を収容し、吸水性のある積層シートでピロー包装を行い、これを−10℃の条件で保存した。吸収性のある積層シートは、不織布、紙及びプラスチックを貼り合わせ、不織布側をトレーに接する向きにして用いた。
【0037】
実施例1〜5、比較例1〜3のそれぞれについて、保存開始から3日後、5日後及び7日後に取り出し、トレーごと電子レンジ加熱を行い、食感の評価を行った。
食感の評価は、製造直後に電子レンジ加熱を行った春巻の食感を5点とし、吸水性の内プラスチックトレーで7日間保存し電子レンジ加熱を行った春巻の食感を1点として、それぞれの春巻の食感を評価した。結果を表1に示す。
【0038】
【表1】

Figure 0004364560
【0039】
表1の結果から、比較例1〜3のように吸水性の無いまたは乏しいトレーに春巻を収容して保存した製品に比べ、吸水性のあるトレーを用いた実施例1,2は、食感の劣化が抑制され、良好な食感が維持された。また、中仕切りを設けて冷凍食品の接触面積を増やした実施例3,4、さらに、吸水性を有する積層シートでトレーをピロー包装した実施例5では、食感の劣化がさらに抑制され、より良好な食感が維持された。
【0040】
【発明の効果】
本発明の冷凍食品包装体は、冷凍食品と接する少なくとも一部が20〜500g/mの吸水度を有するトレーを用いたものなので、このトレーに冷凍食品を収容し密封した冷凍食品包装体の流通、保管時に、冷凍食品の皮や衣への余分な水分の吸着を軽減または防止でき、冷凍食品を電子レンジ加熱した食品の食感を向上させることができる。
また、このトレーは、冷凍食品を収容した状態で、そのまま電子レンジ加熱を行うことができ、加熱時に水分、油分を吸収して食品の食感を向上させることができる。
【図面の簡単な説明】
【図1】 本発明の第1の実施形態を示す冷凍食品包装体の斜視図である。
【図2】 同じ冷凍食品包装体の側面断面図である。
【図3】 本発明の第2の実施形態を示すトレーの斜視図である。
【図4】 本発明の第3の実施形態を示すトレーの斜視図である。
【図5】 本発明の第4の実施形態を示すトレーの斜視図である。
【図6】 本発明の第5の実施形態を示す冷凍食品包装体の要部断面図である。ただし、このトレーに収容された冷凍食品の記載は省略されている。
【図7】 従来の冷凍食品包装体を例示する斜視図である。
【符号の説明】
10,50 冷凍食品包装体
11,21,31,41 トレー
12 冷凍食品
13,51 包装袋
14,22,32,42 底部
15,23,33,43 側壁部
16 開口部
24 蓋部
25 中仕切り
34,44 フランジ部
45 把手部
52 プラスチックフィルム
53 吸水シート[0001]
BACKGROUND OF THE INVENTION
The present invention is used for the packaging of frozen foods, especially cooked frozen foods, and reduces, prevents, and prevents the absorption and absorption of excess water on the skin and clothes of frozen foods during manufacture, distribution and storage. The present invention relates to a frozen food packaging tray capable of providing a food having a good texture and a frozen food packaging body packaged using the frozen food packaging tray.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, frozen food packages in a form in which frozen foods, particularly cooked frozen foods, are stored in a tray and sealed in a packaging bag have been provided.
FIG. 7 is a view showing an example of a conventional frozen food packaging body. This frozen food packaging body 1 contains frozen food 3 in a plastic tray 2 having a plurality of food containing recesses 5. Is placed in a packaging bag 4 made of a plastic film having low moisture permeability, and the packaging bag 4 is sealed.
In addition, a food packaging for cooking a microwave oven has been proposed that uses a plastic tray as described above, wraps frozen oil-treated frozen food, and can heat only the necessary amount during microwave heating (for example, Patent Documents). 1).
[0003]
By the way, when cooking cooked foods, especially frozen foods such as spring rolls fried in oil by microwave heating, the skin and clothes of frozen foods contain a lot of extra water. If it is, the skin and clothes will become sticky after heating in the microwave, and the original crisp texture will not be obtained. Therefore, it is desirable that frozen foods such as spring rolls are frozen and stored in a state in which excess moisture is not adsorbed to the skin or clothes in order to obtain a good texture after heating in the microwave. During manufacture, distribution, or storage of frozen food packaging, excess moisture may be adsorbed to the frozen food skin or clothes. Moisture transfer to clothes and clothes, residual water vapor in packaged frozen foods and moisture transfer from the outside of the food due to re-freezing are considered.
Conventionally, as a method for removing excess moisture from frozen foods, a method of freezing and storing a sheet-like water-absorbing device in contact with food before freezing has been proposed (see, for example, Patent Document 2).
In addition, it is composed of a hydrophobic fiber sheet that allows moisture to pass through the inner layer in contact with food, an absorbent fiber sheet that absorbs and retains moisture in the intermediate layer, and a laminated sheet that is laminated with an impermeable plastic film on the outer layer. , the average distance between fibers of hydrophobic fiber sheet is not less 35μm or more, and moisture permeability of the laminated sheet is 100 g / m 2 day or less, packaging for food cooking water absorption is 100 to 500 g / m 2 from the inner layer The body has been proposed.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-278974 [Patent Document 2]
Japanese Patent Laid-Open No. 9-294531 [Patent Document 3]
JP-A-7-132974 Publication
[Problems to be solved by the invention]
However, the above-described conventional technique has the following problems.
The technique described in Patent Document 1 uses a plastic tray for packaging frozen food, and the distribution and storage of this frozen food packaging body is due to penetration of antifreeze water inside the food, sublimation of ice crystals, etc. Excess moisture is adsorbed to the skin and clothing of frozen foods due to moisture transfer to food skins and clothing, residual water vapor in packaged frozen foods and moisture transfer from outside the food due to re-freezing, especially fried in oil In the case of a packaged frozen food such as spring rolls, the skin and clothes are sticky after heating in the microwave, and the original crisp texture cannot be obtained.
In addition, the technique described in Patent Document 2 is that foods to be packaged are seafood and meat, and are not cooked foods that are subjected to microwave heating, but a texture after microwave heating in this type of frozen food. There is no mention that it is effective for improvement. Patent Document 2 is a technique for absorbing moisture in food before freezing with a water absorption tool and then freezing the food, and is intended to prevent adsorption of excess moisture to the skin and clothing of frozen food during distribution and storage. It is not what I did.
Furthermore, the technology described in Patent Document 3 is for packaging food when the food is heated in a microwave oven, and for preventing the food from becoming sticky due to drip or condensation that occurs during electronic cooking. It is not intended to prevent excessive moisture from adsorbing to the skin and clothes of frozen food during storage. In Patent Document 3, food is put in a laminated sheet formed in a bag shape and heated in a microwave oven. With such a method, there is a problem that the food is deformed or easily broken. Further, such a laminated sheet is not preferable as a packaging material for this kind of food because it is difficult to seal and oily oozing is likely to occur when an oil-like food is packaged.
[0006]
The present invention has been made in view of the above circumstances, and reduces, prevents, and prevents the absorption and absorption of excess moisture on the skin and clothes of frozen food during manufacture, distribution and storage, and has a good texture after heating in a microwave oven It is an object of the present invention to provide a frozen food packaging tray and a frozen food packaging body packaged using the frozen food packaging tray.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a method for improving the texture of a frozen food in a frozen food package in which frozen food is stored in a tray and sealed in a packaging bag,
As the tray, a frozen food packaging tray in which at least a part in contact with the frozen food has a water absorption of 20 to 500 g / m 2 is used. There is provided a method for improving the texture of frozen food, characterized by reducing or preventing excessive moisture adsorption and improving the texture of food obtained by heating a frozen food in a microwave oven .
The frozen food packaging tray may have a bottom portion and a side wall portion erected from the periphery thereof, with the upper side being open.
Alternatively, the frozen food packaging tray has a bottom portion and a side wall portion standing from the periphery thereof, and includes a lid portion that closes the upper opening and a partition that aligns the frozen food contained in the tray. It is good also as a structure which has any one or both.
The frozen food packaging tray has a plastic tray main body having at least one food containing recess for containing the frozen food, and 20 to 500 g / m 2 attached to at least a part of the tray main body in contact with the frozen food. It may consist of a water-absorbing material having a water absorbency of.
The frozen food packaging tray over the a plurality of frozen food is accommodated, may be provided weakening lines capable disconnect housing portion of the individual frozen food from the other unit.
Before Symbol packaging bag are either made of a plastic film, or an outer layer of plastic film is preferably made of laminated sheet having an inner layer made of a material having a water absorption of 20 to 500 g / m 2.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 are views showing a first embodiment of the present invention. In these drawings, reference numeral 10 denotes a frozen food packaging body, 11 denotes a frozen food packaging tray (hereinafter abbreviated as a tray), and 12 denotes. Frozen food, 13 is a packaging bag.
The frozen food package 10 includes a tray 11, a frozen food 12 accommodated in the tray 11, and a packaging bag 13 that covers and covers the tray 11 that accommodates the frozen food 12. .
[0009]
The tray 11 includes a flat bottom portion 14 and a side wall portion 15 erected from the periphery thereof, and a portion that contacts frozen food (hereinafter referred to as an inner surface) has a water absorption of 20 to 500 g / m 2 . And has a structure in which the frozen food 12 is taken in and out from the upper opening 16. Examples of the material used for the tray 11 include paper, processed paper, and non-woven fabric. These can be used alone or as a laminate in which two or more kinds are bonded together.
[0010]
In the present invention, the “water absorption” of the tray is described in the method described in JIS P 8140 paper and paperboard-water absorption test method-Cobb method or in the water absorption test method by JIS P 8141 paper and paperboard Krem method. It is the water absorption measured according to the method.
[0011]
The tray according to the present invention can be manufactured by various methods, for example, by a conventionally known method such as drawing, molding, or flat paper assembly. The tray 11 according to the first embodiment shown in FIGS. 1 and 2 cuts paper having an appropriate thickness into a predetermined shape, bends the side wall portion 15, and applies an adhesive such as a hot melt adhesive to the adhesive margin portion. It is manufactured by assembling in a box shape and bonding the adhesive margin portion to a predetermined position on the outer surface of the side wall portion 15.
[0012]
The tray 11 is an inner surface in contact with the frozen food is 20 to 500 g / m 2, because more preferably such having a water absorption of 40~300g / m 2, in the packaging bag 13 accommodates the frozen food 12 on the tray 11 At the time of distribution and storage of the sealed frozen food package 10, it is possible to reduce or prevent the adsorption of excess moisture on the skin and clothes of the frozen food 12. If the water absorption of the inner surface of the tray 11 is less than 20 g / m 2 , moisture absorption by the tray 11 becomes insufficient, and excess water is easily absorbed by the skin and clothes of the frozen food 12 during distribution and storage. After cooking in the microwave, the skin and clothing of the food may become sticky and worsen the texture. On the other hand, if the water absorption of the inner surface of the tray 11 exceeds 500 g / m 2 , the moisture and oil content of the frozen food 12 are absorbed more than necessary, and the food texture may deteriorate.
[0013]
The outer surface of the tray 11 that is not in contact with the frozen food 12 may have a water absorption of 20 to 500 g / m 2 like the inner surface, and a waterproofing agent such as paraffin is applied or a plastic film is applied. It may be bonded and waterproofed. Moreover, desired coloring and printing can also be given to an outer surface.
[0014]
The frozen food 12 accommodated in the tray 11 is not particularly limited, but cooked foods, especially oil-frozen frozen foods such as spring rolls, croquettes, fried shrimp, fried potatoes, fried chicken, and cutlets fried in oil, 11, the moisture is absorbed, and it is difficult for extra moisture to be adsorbed to the skin and clothes of the food, and a good texture is maintained after heating in the microwave, so the texture improvement effect of the present invention is high.
[0015]
The packaging bag 13 is made of a plastic film, preferably a plastic film having a low moisture permeability that has been conventionally used for packaging frozen food in a bag shape. This packaging bag 13 is sealed and packaged with a tray 11 containing frozen food 12 by a conventionally known pillow packaging method or the like. This packaging form can be set as appropriate according to the size and shape of the tray 11, and is usually packed in a horizontal pillow.
[0016]
Since this frozen food packaging body 10 uses a tray whose inner surface in contact with the frozen food 12 has a water absorption of 20 to 500 g / m 2 , the frozen food packaging body 10 in which the frozen food 12 is accommodated and sealed in this tray 11. During distribution and storage, the adsorption of excess moisture to the skin and clothes of the frozen food 12 can be reduced or prevented, and the texture of the food obtained by heating the frozen food 12 in a microwave oven can be improved. Moreover, this tray 11 can perform microwave heating as it is in the state which accommodated the frozen food 12, and can absorb the water | moisture content and oil content at the time of a heating, and can improve the food texture of cooked food.
[0017]
FIG. 3 is a view showing a second embodiment of the present invention. In this figure, reference numeral 21 denotes a tray. The tray 21 includes a flat bottom portion 22, a side wall portion 23 erected from the periphery thereof, a lid portion 24 that closes the upper opening, and a partition 25 that aligns the frozen food 12 accommodated in the tray 21. It has the structure which has.
[0018]
The tray 21 is made of paper having a water absorption of 20 to 500 g / m 2 at least at the lid portion 24 and the partition 25 in contact with the frozen food 12. The lid portion 24 is formed by extending a part of the side wall portion 23 and bending the boundary between the side wall portion 23 and the extended portion. Moreover, the front-end | tip part of the cover part 24 is bent, and when closing the cover part 24, it is inserted in the tray main body side. Moreover, the partition 25 is shape | molded in the shape which connected the some circular arc accommodation groove | channel so that the frozen food 12 could be accommodated stably. The inner partition 25 can be formed by extending the side wall portion 23 and processing it into the above-mentioned shape, and then bending the inner partition 25 in a direction governing in the tray. Alternatively, the separately manufactured inner partition 25 can be formed by the bottom portion 22 and the side wall portion 23. It can also be inserted into a tray body comprising the lid portion 24.
[0019]
In the tray 21 of the present embodiment, the frozen food 12 can be placed on the partition 25 and the opening can be closed by the lid portion 24. Therefore, the extra moisture of the frozen food 12 can be reliably adsorbed by the tray 21, and the microwave oven can be used. The texture of the food after heating is further improved. In addition, by placing the frozen food 12 on the partition 25 and closing the opening with the lid 24, the frozen food 12 becomes difficult to break, and the appearance can be kept good.
[0020]
In this tray 21, it is preferable to make it the structure which can isolate | separate the accommodating part of each frozen food 12 from another part. Specifically, a weakening line such as a perforation is provided on the tray 2 in FIG. 7 as indicated by a dotted line, and one receiving portion can be separated along the weakening line. Thus, by making it possible to separate the storage portions of the individual frozen foods 12, the necessary number of frozen food storage portions can be separated and heated as they are in a microwave oven, and the rest can be stored frozen as they are. .
[0021]
FIG. 4 is a view showing a third embodiment of the present invention. In this figure, reference numeral 31 denotes a tray. The tray 31 is formed by drawing cardboard and forming a plate-like bottom portion 32 and a side wall portion 33 erected from the periphery thereof. The front end of the side wall portion 33 is bent outward and a flange portion 34 is provided. In this example, the bottom 32 of the tray 31 is formed in a flat plate shape, but one or more ridges may be provided simultaneously with the tray drawing process in order to align the frozen foods 12.
[0022]
The tray 31 and the frozen food package packaged using the tray 31 have the same effects as those of the first embodiment, and the tray 31 has a dish shape. Can be put on the table as it is.
[0023]
FIG. 5 is a view showing a fourth embodiment of the present invention, and reference numeral 41 in the drawing is a tray. The tray 41 is produced by a molding method, and has a flat bottom 42, a side wall 43 standing from its periphery, and extends horizontally from the end of the side wall 43 toward the outside. It is formed in a dish shape having a flange portion 44 having a portion 45. In this example, the bottom portion 42 of the tray 41 has a flat plate shape, but one or more ridges may be provided simultaneously with the molding of the tray in order to align the frozen foods 12.
[0024]
The tray 41 and the frozen food package packaged using the tray 41 can obtain the same effects as those of the first embodiment, and the tray 41 has a dish shape. Can be put on the table as it is.
[0025]
FIG. 6 is a view showing a fifth embodiment of the present invention. In this figure, reference numeral 50 denotes a frozen food packaging body, 51 denotes a packaging bag, and the packaging bag 51 includes an outer layer side plastic film 52 and 20. It is made of a laminated sheet obtained by laminating an inner layer side water absorbing sheet 53 having a water absorption of ˜500 g / m 2 . As this water absorbing sheet 53, a sheet of paper, processed paper, non-woven fabric, or a sheet in which two or more kinds are bonded together is used.
[0026]
Since this frozen food packaging body 50 is a packaging bag having water absorption, and the trays 11, 21, 31 or 41 are packaged, in addition to the absorption of excess water and oil in the food by the trays 11, 21, 31 or 41. The packaging bag 51 can also absorb excess moisture and oil from the food, and the texture of the cooked food is further improved.
[0027]
In addition, the tray and frozen food packaging body of this invention are not limited to the illustration in each embodiment mentioned above, A various change is possible.
For example, a water absorbing material made of a material such as paper having a water absorption of 20 to 500 g / m 2 is bonded to at least the inner surface of the food containing recess 5 of the plastic tray 2 shown in FIG. It can also be configured.
[0028]
【Example】
A spring-cooked spring roll was used as a food, packaged in the packaging specifications of Examples 1 to 5 and Comparative Examples 1 and 2 below, and stored at -10 ° C.
[0029]
[Example 1]
A paper having a water absorption of 80 g / m 2 was used to produce a tray having the shape shown in FIGS. Frozen spring rolls were accommodated in this tray, pillow-wrapped with a plastic film, and stored at -10 ° C.
[0030]
[Example 2]
A paper having a water absorption of 200 g / m 2 was used to produce a tray having the shape shown in FIGS. Frozen spring rolls were accommodated in this tray, pillow-wrapped with a plastic film, and stored at -10 ° C.
[0031]
[Example 3]
Using a paper having a water absorption of 80 g / m 2 , a tray having a shape having a partition was produced. Frozen spring rolls were accommodated in this tray, pillow-wrapped with a plastic film, and stored at -10 ° C.
[0032]
[Example 4]
Using a paper having a water absorption of 80 g / m 2 , a tray having a shape having a lid and a partition as shown in FIG. 3 was produced. Frozen spring rolls were accommodated in this tray, pillow-wrapped with a plastic film, and stored at -10 ° C.
[0033]
[Example 5]
Using a paper having a water absorption of 80 g / m 2 , a tray having a shape having a lid and a partition as shown in FIG. 3 was produced. Frozen spring rolls were housed in this tray, pillow-wrapped with a water-absorbing laminated sheet, and stored at -10 ° C. The laminated sheet having water absorption was used by bonding a nonwoven fabric, paper and a plastic film so that the nonwoven fabric was in contact with the tray.
[0034]
[Comparative Example 1]
The frozen spring roll was accommodated in a plastic tray having a shape shown in FIG. 7 in which a polypropylene resin was molded, and pillow packaging was performed with a plastic film, which was stored at -10 ° C.
[0035]
[Comparative Example 2]
A paper having a water absorption of 5 g / m 2 was used to produce a tray having the shape shown in FIGS. Frozen spring rolls were accommodated in this tray, pillow-wrapped with a plastic film, and stored at -10 ° C.
[0036]
[Comparative Example 3]
The frozen spring roll was accommodated in a plastic tray having a shape shown in FIG. 7 in which a polypropylene resin was molded, and pillow packaging was performed with a water-absorbing laminated sheet, which was stored at -10 ° C. The absorbent laminated sheet was used by bonding non-woven fabric, paper and plastic, with the non-woven fabric side facing the tray.
[0037]
About each of Examples 1-5 and Comparative Examples 1-3, it took out after 3 days, 5 days, and 7 days from the start of preservation | save, the microwave oven heating was performed for every tray, and food texture was evaluated.
The evaluation of the texture is 5 points for the spring roll texture that was heated in the microwave immediately after production, and 1 point for the texture of the spring roll that was stored for 7 days in a water-absorbent plastic tray and heated in the microwave oven. As a result, the texture of each spring roll was evaluated. The results are shown in Table 1.
[0038]
[Table 1]
Figure 0004364560
[0039]
From the results in Table 1, Examples 1 and 2 using trays with water absorption compared to products in which spring rolls were stored and stored in trays having no water absorption or poor water absorption as in Comparative Examples 1 to 3, Deterioration of feeling was suppressed and good texture was maintained. Further, in Examples 3 and 4 in which the contact area of the frozen food was increased by providing a partition, and in Example 5 in which the tray was pillow-wrapped with a laminated sheet having water absorption, the deterioration of the texture was further suppressed, and more A good texture was maintained.
[0040]
【The invention's effect】
Since the frozen food package of the present invention uses a tray in which at least a part in contact with the frozen food has a water absorption of 20 to 500 g / m 2 , the frozen food package in which the frozen food is contained and sealed in this tray is used. During distribution and storage, it is possible to reduce or prevent the adsorption of excess moisture to the skin and clothes of the frozen food, and to improve the texture of the food obtained by heating the frozen food.
Moreover, this tray can perform microwave heating as it is in the state which accommodated frozen food, and can absorb the water | moisture content and oil content at the time of a heating, and can improve the food texture of foodstuffs.
[Brief description of the drawings]
FIG. 1 is a perspective view of a frozen food packaging body showing a first embodiment of the present invention.
FIG. 2 is a side sectional view of the same frozen food package.
FIG. 3 is a perspective view of a tray showing a second embodiment of the present invention.
FIG. 4 is a perspective view of a tray showing a third embodiment of the present invention.
FIG. 5 is a perspective view of a tray showing a fourth embodiment of the present invention.
FIG. 6 is a cross-sectional view of a principal part of a frozen food packaging body showing a fifth embodiment of the present invention. However, the description of the frozen food contained in this tray is omitted.
FIG. 7 is a perspective view illustrating a conventional frozen food package.
[Explanation of symbols]
10, 50 Frozen food package 11, 21, 31, 41 Tray 12 Frozen food 13, 51 Packaging bag 14, 22, 32, 42 Bottom portion 15, 23, 33, 43 Side wall portion 16 Opening portion 24 Lid portion 25 Partition 34 44 Flange 45 Handle 52 Plastic film 53 Water absorbent sheet

Claims (7)

冷凍食品をトレーに収容し、これを包装袋に入れて密封包装した冷凍食品包装体における冷凍食品の食感改善方法であって、A method for improving the texture of a frozen food in a frozen food package in which frozen food is stored in a tray and sealed in a packaging bag,
前記トレーとして、冷凍食品と接する少なくとも一部が20〜500g/m  As the tray, at least a part in contact with frozen food is 20 to 500 g / m. 2 の吸水度を有する冷凍食品包装用トレーを用い、冷凍食品包装体の流通、保管時に、冷凍食品の皮や衣への余分な水分の吸着を軽減または防止して、冷凍食品を電子レンジ加熱した食品の食感を改善することを特徴とする冷凍食品の食感改善方法。Frozen food packaging trays with a water absorption of 5% were used to reduce or prevent the adsorption of excess moisture to the frozen food skin and clothing during the distribution and storage of frozen food packaging, and the frozen food was heated in a microwave oven. A method for improving the texture of frozen food, characterized by improving the texture of the food.
前記冷凍食品包装用トレーが、底部と、その周縁から立設された側壁部とを有し、上側が開口した構造である請求項1に記載の冷凍食品の食感改善方法The method for improving the texture of frozen food according to claim 1, wherein the frozen food packaging tray has a bottom portion and a side wall portion erected from the periphery thereof, and the upper side is open. 前記冷凍食品包装用トレーが、底部と、その周縁から立設された側壁部とを有し、かつ上側の開口を塞ぐ蓋部とトレー内に収容された冷凍食品を整列させる中仕切りとのいずれか一方または両方を有する構造である請求項1に記載の冷凍食品の食感改善方法The frozen food packaging tray has any one of a bottom portion and a side wall portion erected from the periphery thereof, a lid portion that closes the upper opening, and a partition that aligns the frozen food accommodated in the tray. The method for improving the texture of frozen food according to claim 1, which has a structure having one or both of them. 前記冷凍食品包装用トレーが、冷凍食品を収容する少なくとも1つの食品収容凹部を有するプラスチック製のトレー本体と、該トレー本体の冷凍食品と接する少なくとも一部に取り付けられた20〜500g/mの吸水度を有する吸水材とからなることを特徴とする請求項1に記載の冷凍食品の食感改善方法 The frozen food packaging tray has a plastic tray main body having at least one food containing recess for containing the frozen food, and 20 to 500 g / m 2 attached to at least a part of the tray main body in contact with the frozen food. The method for improving the texture of frozen food according to claim 1, comprising a water-absorbing material having a water absorption. 前記冷凍食品包装用トレーが、複数個の冷凍食品が収容され、個々の冷凍食品の収容部分を他部から切り離し可能な弱化線を有する請求項1〜4のいずれかに記載の冷凍食品の食感改善方法 The frozen food packaging tray, a plurality of frozen food is accommodated, eating frozen food according to claim 1 having a line of weakness which can disconnect the receiving portion of the individual frozen food from the other portion Feeling improvement method . 前記包装袋がプラスチックフィルムからなる請求項に記載の冷凍食品の食感改善方法The method for improving the texture of frozen food according to claim 1 , wherein the packaging bag is made of a plastic film. 前記包装袋が、プラスチックフィルムからなる外層と、20〜500g/mの吸水度を有する素材からなる内層とを有する積層シートからなる請求項に記載の冷凍食品の食感改善方法The texture improvement method of the frozen food of Claim 1 which the said packaging bag consists of a laminated sheet which has the outer layer which consists of a plastic film, and the inner layer which consists of a raw material which has a water absorption of 20-500 g / m < 2 >.
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