JP2580660B2 - Enoki mushroom freshness preservation method - Google Patents

Enoki mushroom freshness preservation method

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Publication number
JP2580660B2
JP2580660B2 JP33056487A JP33056487A JP2580660B2 JP 2580660 B2 JP2580660 B2 JP 2580660B2 JP 33056487 A JP33056487 A JP 33056487A JP 33056487 A JP33056487 A JP 33056487A JP 2580660 B2 JP2580660 B2 JP 2580660B2
Authority
JP
Japan
Prior art keywords
freshness
multilayer film
enoki mushroom
film
enoki
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP33056487A
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Japanese (ja)
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JPH01171434A (en
Inventor
勤 井坂
三郎 太田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyobo Co Ltd
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Toyobo Co Ltd
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Priority to JP33056487A priority Critical patent/JP2580660B2/en
Publication of JPH01171434A publication Critical patent/JPH01171434A/en
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Description

【発明の詳細な説明】 (産業上の利用分野) 本発明はエノキダケの鮮度保持方法に関し、更に詳し
くは、エノキダケを良好な包装形態のもとで長時間に亘
り、高鮮度に保つことのできる方法に関するものであ
る。
Description: FIELD OF THE INVENTION The present invention relates to a method for maintaining the freshness of enoki mushrooms, and more particularly, to keeping enoki mushrooms in high freshness over a long period of time in a good packaging form. It is about the method.

(従来の技術) 近年、エノキダケをはじめとする野菜は、一般消費者
の嗜好として、より新鮮なものを要望される傾向が強ま
っている。したがって、これらのエノキダケの包装物が
一般消費者の手に渡るまでの流通過程で最も問題となる
のは、収穫時の鮮度を如何にうまく保持するかというこ
とである。農林水産技術会議事務局発行の実用化技術レ
ポートNo.54(1978)によればエノキダケの品質保持限
界は、20℃で3日間と非常に短い。(PE30μ包装)又、
特開昭52−5458号公報では、ポリプロピレンとポリビニ
ルアルコールの2層ラミネートフィルムによる生きのこ
の包装袋が記載されている。しかし、このフィルムは、
水蒸気透過度、ガス透過度が極めて低く、春から夏の雰
囲気下では水分過剰による水きのこの発生、及び、袋内
酸素濃度低下が原因の無気呼吸による品質低下が発生し
易いという欠点があった。エノキダケは、呼吸、水分蒸
散が激しい為、蒸散防止、防止、簡易CA効果をもつフィ
ルム包装が適しているが、従来、過度の水蒸気透過度、
ガス透過度と良好な防曇性を兼ね備えたものがなく鮮度
保持性に欠点があった。
(Prior Art) In recent years, there has been a growing tendency for general consumers to desire fresher vegetables such as enoki mushrooms. Therefore, the most important issue in the distribution process of these enoki mushroom packages until they reach the hands of ordinary consumers is how to maintain the freshness at harvest. According to the practical application technical report No.54 (1978) issued by the Secretariat of the Agriculture, Forestry and Fisheries Technology Council, the quality retention limit of enoki mushroom is very short at 20 ° C for 3 days. (PE30μ packaging)
JP-A-52-5458 describes a living bag made of a two-layer laminate film of polypropylene and polyvinyl alcohol. However, this film
The water vapor permeability and gas permeability are extremely low, and there are drawbacks that in the spring to summer atmosphere, water mushrooms are generated due to excessive moisture, and the quality is easily reduced due to atelectasis caused by a decrease in oxygen concentration in the bag. Was. Since enokidake has a strong breathing and water evaporation, it is suitable to use a film wrapping with prevention of transpiration, prevention and simple CA effect.
There was no one having both gas permeability and good antifogging property, and there was a defect in freshness retention.

(発明が解決しようとする問題点) 本発明は、エノキダケの流通中及び店頭における前記
従来の欠点即ち、品質の低下を解消せんとするものであ
る。
(Problems to be Solved by the Invention) The present invention is intended to eliminate the above-mentioned conventional drawback during enokidake distribution and at stores, that is, deterioration in quality.

(問題を解決するための手段) 即ち本発明は、 (1) 下記(ア)〜(ウ)項を満足する複層フィルム
を用いて形成した袋体、または、断裁物にエノキダケを
包装し、密封するエノキダケの鮮度保持方法。
(Means for Solving the Problem) That is, the present invention provides: (1) packaging enoki mushrooms in a bag or a cut piece formed using a multilayer film satisfying the following items (A) to (C); A method for keeping the enoki mushroom fresh.

(ア) 複層フィルムの水蒸気透過度が20〜150g/m2、2
4hr・40℃、酸素透過度が3000〜30,000cc/m2・24hr・at
m・20℃・90%RH、炭酸ガス透過度が12,000〜110,000cc
/m2・24hr・atm・20℃・90%RHであること。
(A) The multilayer film has a water vapor permeability of 20 to 150 g / m 2 , 2
4hr · 40 ° C., oxygen permeability 3000~30,000cc / m 2 · 24hr · at
m ・ 20 ℃ ・ 90% RH 、 Carbon dioxide permeability 12,000 ~ 110,000cc
/ m 2 · 24hr · atm · 20 ℃ be · 90% RH.

(イ) 複層フィルムの少なくともエノキダケを接する
片面側表面に防曇剤が存在すること。
(A) An antifogging agent is present on at least one surface of the multilayer film in contact with the enoki mushroom.

(ウ) 複層フィルムが溶断シール性を有すること。(C) The multilayer film has fusing sealability.

(2) エノキダケを脱気した後、密封することによる
上記(1)に記載の鮮度保持方法。
(2) The method for maintaining freshness according to (1) above, wherein the enoki mushroom is degassed and then sealed.

(3) 270℃で溶断シールしたときに3.0kg−cm/15mm
以上の溶断シール強度を示すものである上記(1)又は
(2)に記載の複層フィルムを用いるエノキダケの鮮度
保持方法。
(3) 3.0kg-cm / 15mm when melt-sealed at 270 ° C
The method for maintaining freshness of enokidake using the multilayer film according to the above (1) or (2), which exhibits the above-mentioned fusing seal strength.

(4) 少なくともエノキダケに接する片面側表面が、
040℃の間で温度変化を繰り返す経過中防曇性を示す
ものである上記(1)〜(3)に記載の複合フィルムを
用いるエノキダケの鮮度保持方法。
(4) At least one side surface in contact with the enoki mushroom
A method for maintaining freshness of enoki mushroom using the composite film according to any one of the above (1) to (3), which exhibits antifogging property during the course of repeated temperature changes at 040 ° C.

(5) 複層フィルムの基層構成材が、炭素数2〜10の
α−オレフィン系共重合体の1種以上:30〜90重量%と
酢酸ビニル、アクリル酸及びスチレンよりなる1種以上
のモノマー単位が全構成々分中の5〜80重量%を占める
共重合体の1種以上:10〜70重量%との混合物である上
記(1)〜(4)のいずれかに記載の鮮度保持方法。
(5) The base layer constituting material of the multilayer film is at least one kind of α-olefin copolymer having 2 to 10 carbon atoms: 30 to 90% by weight and at least one kind of monomer composed of vinyl acetate, acrylic acid and styrene The method for preserving freshness according to any one of the above (1) to (4), which is a mixture of at least one of 10 to 70% by weight of a copolymer whose unit accounts for 5 to 80% by weight of the total components. .

(6) 複層フィルムの表面層構成材が、炭素数2〜10
のα−オレフィン系共重合体である上記(1)〜(5)
のいずれかに記載の鮮度保持方法。
(6) The surface layer constituting material of the multilayer film has 2 to 10 carbon atoms.
(1) to (5), which are α-olefin-based copolymers
The method for maintaining freshness according to any one of the above.

本発明における要件、即ち、エノキダケは密封して包
装することが必要であるが、密封方法としては、テープ
止め、熱シール、金具止め、ヒモ止め等実質的に密封さ
れておれば任意である。密封が不充分もしくは開放する
と、エノキダケの変色が著しく商品価値が短時間で失わ
れる。
The requirement in the present invention, that is, enoki mushroom is required to be sealed and packaged, but the sealing method is arbitrary as long as it is substantially sealed, such as a tape, a heat seal, a metal fitting, and a string. If the seal is insufficient or opened, the discoloration of the enoki mushroom is remarkable and the commercial value is lost in a short time.

本発明における要件(ア)、即ち、複層フィルムの水
蒸気透過度、酸素透過度、炭酸ガス透過度を特定にする
ことを定めた理由について説明する。水蒸気透過度は、
エノキダケに含まれている水分の蒸発及び蒸散作用によ
り放出される水分による袋内湿度を適正に保ち、湿度過
剰によるむれ現象を防止して腐敗を抑制すると共に、湿
度不足による青果物の萎凋、変色(黄変又は褐変)、軟
化、弾力性喪失等を防止するうえで重要な特性であり、
水蒸気透過度が20g/m2・24hr・40℃未満では湿度過剰に
よるむれ現象によって水きのこが発生し易く、一方150g
/m2・24hr・40℃を超える場合は湿度不足となって萎
凋、変色を起こし易く、何れの場合も満足のいく鮮度保
持効果を得ることができない。良好な鮮度保持効果を確
保するうえでより好ましい水蒸気透過度は25〜120g/m2
・24hr・40℃の範囲である。
The requirement (A) in the present invention, that is, the reason why the water vapor permeability, oxygen permeability, and carbon dioxide gas permeability of the multilayer film are specified to be specified will be described. The water vapor permeability is
The moisture in the enoki mushroom is released by the evaporation and transpiration of the water, and the humidity in the bag is properly maintained. Yellowing or browning), softening, is an important property to prevent loss of elasticity,
Easily water mushrooms generated by herd behavior due to excess humidity is less than the water vapor permeability of 20g / m 2 · 24hr · 40 ℃, whereas 150g
When the temperature exceeds / m 2 · 24 hr · 40 ° C., the humidity tends to be insufficient, so that wilting and discoloration are likely to occur, and in any case, a satisfactory freshness retaining effect cannot be obtained. More preferable water vapor transmission rate is 25 to 120 g / m 2 for securing a good freshness holding effect.
・ It is in the range of 24 hours and 40 ° C.

酸素透過度は、呼吸作用による酸素濃度の低下を外部
空気の透過侵入によって補い、生理作用を持続させるう
えで極めて重要な特性であり、該透過度が3,000cc/m2
24hr・atm・20℃・90%RH未満の場合は、エノキダケを
包装したときの内部酸素量が欠乏し、窒息状態となって
十分な鮮度保持効果が発揮されない。一方30,000cc/m2
・24・atm・20℃・90%RHを超えた場合、酸素欠乏現象
を生じる恐れはないが、酸素濃度が大気に近くなり呼吸
抑制作用が発揮されなくなり、何れの場合満足のいく鮮
度保持効果を得ることができない。
Oxygen permeability is a very important property for supplementing the decrease in oxygen concentration due to respiratory action by permeation and invasion of external air and maintaining physiological action, and the permeability is 3,000 cc / m 2.
If the temperature is less than 24 hr / atm / 20 ° C / 90% RH, the amount of internal oxygen when enoki mushroom is packaged will be deficient, resulting in choking and a lack of sufficient freshness retaining effect. 30,000cc / m 2
・ When exceeding 24 ・ atm ・ 20 ℃ ・ 90% RH, there is no danger of oxygen deficiency.However, the oxygen concentration becomes close to the atmosphere and the respiratory depressing effect is not exhibited. Can not get.

酸素透過度のより好ましい範囲は4,000〜20,000cc/m2
・24hr・atm・20℃・90%RHである。
A more preferable range of the oxygen permeability is 4,000 to 20,000 cc / m 2
・ 24hr ・ atm ・ 20 ℃ ・ 90% RH

炭酸ガス透過度は、フィルム内のガス組成を適正に保
ち、エノキダケの呼吸作用を保証すると共に炭酸ガス障
害を回避し、更には菌体の侵入・繁殖による腐敗を防止
するうえでも有効な特性であり、該透過度が12,000cc/m
2・24hr・atm・20℃・90%RH未満ではフィルム内の炭酸
ガス濃度が高くなり過ぎてエノキダケの呼吸作用が阻害
され、鮮度及び味覚が急速に低下してくる。
The carbon dioxide permeability is a property that is effective in maintaining the gas composition in the film properly, guaranteeing the respiration of enoki mushrooms, avoiding carbon dioxide damage, and preventing rot due to invasion and propagation of bacteria. Yes, the transmittance is 12,000cc / m
If the temperature is less than 2.24 hr.atm.20.degree. C..90% RH, the concentration of carbon dioxide in the film becomes too high, and the respiration of enoki mushroom is inhibited, and the freshness and taste are rapidly reduced.

一方110,000cc/m2・24hr・atm・20℃・90%RHを超え
ると、フィルム内のCo2濃度が低くなりすぎて腐敗防止
効果及び劣化抑制効果が有効に発揮されなくなる。
On the other hand, if it exceeds 110,000 cc / m 2 · 24 hr · atm · 20 ° C. · 90% RH, the concentration of Co 2 in the film becomes too low, and the rot preventing effect and the deterioration suppressing effect cannot be exhibited effectively.

炭酸ガス透過度のより好ましい範囲は15,000〜90,000
cc/m2・24hr・atm・20℃・90%RHである。
A more preferable range of the carbon dioxide gas permeability is 15,000 to 90,000.
It is cc / m 2 · 24hr · atm · 20 ℃ · 90% RH.

更に本発明で使用する複層フィルムにおけるエノキダ
ケに接する側の表面層には保持乃至流通期間中防曇性を
示す様な防曇材を含むものでなければならない。即ち本
発明では、フィルム内面の曇り現象を防止して商品価値
を高めるばかりでなく、曇りの進行によって形成される
水滴による内容物の水腐れを防止するうえでも防曇作用
は極めて重要な特性であり、且つ流通過程で長期的に優
れた防曇性を持続させる為には、保存乃至流通時の気温
変化を考慮して、040℃の間で温度変化を繰り返す経
過中(6時間毎に温度変化を与え24時間測定)継続して
防曇性を示す様な防曇剤が表面層に存在するものである
ことが望まれる。本発明は、前述の如くエノキダケを包
装対象とするものであり、冷凍保存よりもむしろ室温雰
囲気での保存が望まれるが、冬季の室内外の温度差等を
考慮すると、本発明における防曇性の設定に当たって
は、たとえば後述する方法によって求められ、「040
℃の間で温度変化を繰り返したときの防曇持続性」によ
り定めるのがよく、本発明では下記の測定法で1日以上
防曇性を持続するものであることが望まれる。
Further, the surface layer on the side of the multilayer film used in the present invention which is in contact with the enoki mushroom must contain an antifogging material which exhibits antifogging properties during the holding or distribution period. That is, in the present invention, the antifogging action is an extremely important property not only to prevent the fogging phenomenon on the inner surface of the film but to increase the commercial value, but also to prevent water rot of the contents due to water droplets formed by the progress of fogging. In order to maintain the excellent anti-fogging property in the distribution process for a long time in the distribution process, in consideration of the temperature change during storage or distribution, during the course of repeating the temperature change between 040 ° C (temperature every 6 hours) (Measured for 24 hours with a change) It is desired that an antifogging agent having a continuous antifogging property is present in the surface layer. The present invention is intended for packaging enoki mushrooms as described above, and it is desirable to store at room temperature atmosphere rather than frozen storage.However, considering the temperature difference between indoor and outdoor in winter, the antifogging property of the present invention is considered. Is set by, for example, a method described later, and “040” is set.
The anti-fogging continuity when the temperature is repeatedly changed between 0 ° C. ”is preferable. In the present invention, it is desired that the anti-fogging continuity is maintained for 1 day or more by the following measurement method.

(防曇性評価方法) 200ccビーカーに150ccの40℃温水を入れ、試料の防曇
面を内側にしてビーカーにかぶせる。その後、6Hr、0
℃に保ち、次に40℃に6Hrに保つ。この温度変化を繰り
返し、24Hr後にフィルム面を通して容器内容物が明瞭に
観察できるか否かによって判定する。
(Method of evaluating anti-fogging property) In a 200 cc beaker, put 150 cc of warm water at 40 ° C, and cover the beaker with the anti-fog surface of the sample inside. After that, 6Hr, 0
C. and then at 40.degree. This temperature change is repeated, and it is determined whether or not the contents of the container can be clearly observed through the film surface after 24 hours.

表層部に存在させる防曇剤の種類は特に限定されるも
のではなく、従来から知られた防曇剤の他、帯電防止剤
や滑性剤の如く防曇特性を発揮し得るすべてのものを使
用することができ、必要によっては2種以上を併用する
こともできる。これらの防曇剤は表面層構成材中に直接
混入し得る他、基層構成材中にのみ混入させておき、積
層後表面層へ拡散移行させることによって表面層に防曇
性を与えることも可能である。表面層における防曇剤の
存在量は、防曇剤の種類によっても変わってくるので一
律に規定することは適当でないが、好ましいのは0.3〜
3重量%の範囲である。しかして0.3重量%未満では防
曇性能が不十分である為本発明の要求特性が満たされ難
く、一方3重量%を超える場合は表面層が白化現象を生
じて透明性が低下するばかりでなく、エノキダケの蒸散
によって袋の内面に付着した水分が白濁現象を起こし、
商品価値が著しく低下するという問題も生じてくる。
The type of antifogging agent to be present in the surface layer is not particularly limited, and in addition to conventionally known antifogging agents, all that can exhibit antifogging properties such as antistatic agents and lubricating agents can be used. They can be used, and if necessary, two or more kinds can be used in combination. These antifogging agents can be directly mixed into the surface layer constituent material, or can be mixed only into the base layer constituent material and impart antifogging property to the surface layer by diffusing and transferring to the surface layer after lamination. It is. The amount of the antifogging agent in the surface layer varies depending on the type of the antifogging agent, so it is not appropriate to uniformly define the amount, but it is preferably from 0.3 to
It is in the range of 3% by weight. If the content is less than 0.3% by weight, the anti-fogging performance is insufficient, so that the required properties of the present invention are hardly satisfied. If the content is more than 3% by weight, not only the surface layer causes a whitening phenomenon, but also the transparency is lowered. Moisture attached to the inner surface of the bag due to the evaporation of the enoki mushroom causes cloudiness,
There is also a problem that the product value is significantly reduced.

尚製袋前のフィルムの状態で防曇性を評価する簡便法
として表面層の表面張力で評価することも可能であり、
本発明者らが確認したところによると、該表面張力が38
ダイン/cm以上となる様に防曇剤の存在量を調整するこ
とによって、目的にかなう防曇持続性を確保し得ること
が明らかとなった。
Incidentally, it is also possible to evaluate the surface tension of the surface layer as a simple method of evaluating the antifogging property in the state of the film before bag making,
The present inventors have confirmed that the surface tension is 38
It has been clarified that by adjusting the amount of the antifogging agent to be at least dyne / cm, the desired antifogging durability can be ensured.

次に本発明で用いる複層フィルムは、上記の複層フィ
ルムの防曇剤を含む層が内側となる様に重ね合わせて3
方を溶断シールするか、あるいは折り曲げ辺と直交する
2辺溶断シールする、等の手段で袋状に作製された場
合、エノキダケの充填時或は流通時等にシール部が剥離
して開封される現象を阻止し得るに足るシール強度を有
するものではなけれならず、好ましくは270℃で溶断シ
ールしたときの溶断シール強度が3.0kg−cm/15mm以上で
あるものがよく、該溶断シール強度が不足する場合は、
エノキダケの充填時或は取扱い時にシール部が剥離する
恐れがある。尚溶断シール温度は現在実用化されている
一般的な溶断シール温度を基準にして定めたが、上記溶
断シール条件のもとで上記設定値以上の溶断シール強度
を示し得るものである限り、前述の範囲を外れる溶断シ
ール温度を採用することを排除するものではない。
Next, the multilayer film used in the present invention is overlaid so that the layer containing the anti-fogging agent of the above multilayer film is on the inner side.
If it is made into a bag by means such as fusing and sealing on one side or fusing and sealing on two sides perpendicular to the bent side, the seal part is peeled off and opened when filling or encircling enoki mushroom It must have sufficient sealing strength to prevent the phenomenon, and preferably has a fusing seal strength of 3.0 kg-cm / 15 mm or more when fusing and sealing at 270 ° C., and the fusing seal strength is insufficient. If you do
There is a possibility that the seal portion may peel off when filling or handling the enoki mushroom. The fusing seal temperature was determined based on a general fusing seal temperature currently in practical use, but as long as the fusing seal strength above the set value under the above fusing sealing conditions can be exhibited, the above-described fusing seal temperature is used. This does not preclude the use of fusing seal temperatures outside the range.

以上の様な諸持性を有する複層フィルムは、夫夫の要
求特性に合致し得る合成樹脂の共押出しあるいはインラ
インラミネート法等によって製造することができるが、
前述の要求特性との関係を考慮して最も好ましい基層構
成材及び表面層構成材について説明すると次の通りであ
る。
The multilayer film having the above-mentioned various holding properties can be manufactured by a co-extrusion or in-line lamination method of a synthetic resin that can meet the required characteristics of each,
The most preferable base layer constituent material and surface layer constituent material in consideration of the relationship with the above-mentioned required characteristics will be described below.

まず基層は、フィルムに要求される最低限の機械的強
度を確保すると共に、水蒸気、酸素及び炭酸ガスの各透
過性にも最も大きい影響を及ぼすものであり、次の様な
素材を使用することによって前述の目的にかなう基層を
得ることができる。即ち基層構成材としては、炭素数
が2〜10であるα−オレフィン系の共重合体の1種以上
と、酢酸ビニル、アクリル酸及びスチレンよりなる1
種以上のモノマー単位が全構成々分中の5〜80重量%を
占める共重合体の1種以上、との混合物で、且つその混
合比率が前者:30〜90重量%、後者:10〜70重量%で
ある混合物が好ましい。上記を構成する炭素数2〜10
のα−オレフィンの具体例としてはエチレン、プロピレ
ン、ブテン、ヘキセン、ヘプテン等が挙げられるが、よ
り一般的なのはエチレン、プロピレン、ブテンである。
これらα−オレフィンの単独重合体は、前述の要求特性
殊に水蒸気、酸素及び炭酸ガスのすべての透過度を満足
させるうえで必ずしも十分なものとは言えないが、上記
α−オレフィンの2種以上の共重合体を使用すると前記
透過度のすべてを満たす基層が容易に得られる。この場
合の共重合比は、組合されるα−オレフィンの種類に応
じて任意に決定すればよい。また上記を構成する共重
合体としては、酢酸ビニク、アクリル酸及びスチレンよ
りなるモノマー単位を該共重合体全構成々分中に5〜80
重量%を含有する共重合体が好ましく、これらのモノマ
ーと組合されるモノマーとしてはエチレン、プロピレン
等のα−オレフィン、アクリル酸エステル、メタクリル
酸エステル、ブタジエン等が例示される。該共重合体中
に占める酢酸ビニル、アクリル酸及びスチレンよりなる
モノマー単位の重量が5%未満あるいは80%超である場
合は、前記各透過度のすべてを満足することが困難にな
る他、80%超の場合は基層フィルムのヘイズが悪化する
傾向が見られ、また溶断シール性の低下あるいは溶断部
にひげ状物ができる等の難点が生じ易くなる。
First, the base layer ensures the minimum mechanical strength required for the film and has the greatest effect on the permeability of water vapor, oxygen and carbon dioxide gas. Use the following materials. Thus, a base layer meeting the above-mentioned purpose can be obtained. That is, as the base layer constituting material, one or more α-olefin-based copolymers having 2 to 10 carbon atoms, and one of vinyl acetate, acrylic acid and styrene
A mixture of at least one kind of copolymer in which at least one kind of monomer unit accounts for 5 to 80% by weight of the total constituents, and the mixing ratio of the former is 30 to 90% by weight, and the latter is 10 to 70% by weight. Mixtures that are weight percent are preferred. C2-C10 constituting the above
Specific examples of the α-olefin include ethylene, propylene, butene, hexene, heptene and the like, and more common ones are ethylene, propylene and butene.
These α-olefin homopolymers are not necessarily sufficient to satisfy the above-mentioned required properties, particularly, all the permeability of water vapor, oxygen and carbon dioxide gas. When a copolymer of the formula (1) is used, a base layer that satisfies all of the above-mentioned transmittances can be easily obtained. In this case, the copolymerization ratio may be arbitrarily determined according to the type of α-olefin to be combined. Further, as the copolymer constituting the above, a monomer unit consisting of vinyl acetate, acrylic acid and styrene is 5 to 80 in all components of the copolymer.
A copolymer containing 0.1% by weight is preferred, and examples of monomers combined with these monomers include α-olefins such as ethylene and propylene, acrylates, methacrylates, and butadiene. When the weight of the monomer unit composed of vinyl acetate, acrylic acid and styrene in the copolymer is less than 5% or more than 80%, it becomes difficult to satisfy all the above-mentioned transmittances. %, The haze of the base layer film tends to be deteriorated, and it is easy to cause difficulties such as a decrease in fusing sealability or formation of a whisker at a fusing portion.

上記及びの混合比率は前者30〜90重量%に対して
後者は10〜70重量%の範囲とするのがよく、この様な配
合率範囲を特定することによって、強度等の機械的特性
はもとより透明性や溶断シール性及び前記各透過度のす
べてにおいてバランスのとれた性能を確保することがで
きる。ちなみに共重合体の配合率が30重量%未満であ
る場合は、基層フィルムの透明度が低くなって内容物の
透視が困難となり包装体としての商品価値が低下すると
いう欠点に加えて、保存温度が30℃を超える高温となっ
た場合、複合フィルムとしての防曇性が短時間のうちに
喪失される様になるという重大な問題が生じてくる。一
方共重合体が90重量%を超える場合は、ガス透過性能
に問題が生じてくる。たとえば、酸素透過度及び炭素ガ
ス透過度が前記設定範囲に入ったとしても水蒸気透過度
が設定範囲から外れるといった問題が生じ、エノキダケ
の生理作用に好適な包装雰囲気が得られ難くなるため、
期待されるほどの鮮度保持効果が得られない。
The mixing ratio of the above and the former is preferably in the range of 30 to 90% by weight and the latter in the range of 10 to 70% by weight. By specifying such a mixing ratio range, not only mechanical properties such as strength but also Balanced performance can be ensured in all of the transparency, the fusing sealability, and the respective transmittances. Incidentally, when the blending ratio of the copolymer is less than 30% by weight, in addition to the drawback that the transparency of the base film becomes low, the contents are difficult to see through and the commercial value of the package decreases, and the storage temperature is low. At a high temperature exceeding 30 ° C., a serious problem arises in that the antifogging property of the composite film is lost in a short time. On the other hand, when the content of the copolymer exceeds 90% by weight, a problem arises in gas permeation performance. For example, even if the oxygen permeability and the carbon gas permeability fall within the set range, a problem such that the water vapor permeability is out of the set range occurs, and it becomes difficult to obtain a packaging atmosphere suitable for the physiological action of the enoki mushroom,
The expected freshness retaining effect cannot be obtained.

尚上記、を配合するに当たっては、230℃におけ
る該配合物のメルトインデックスが1〜100/10min、よ
り好ましくは2〜50g/10minとなる様に上記、の配
合物の選定するのが好ましい。
In addition, when compounding the above, it is preferable to select the above compound so that the melt index of the compound at 230 ° C. is 1 to 100/10 min, more preferably 2 to 50 g / 10 min.

次に表面層構成材は、防曇剤の存在によって長期に亘
り優れた防曇性を持続し得る特性が要求される他、優れ
た溶断シール性を有することが必要であり、こうした要
求を満たす為の表面層構成材としては、炭素数が2〜10
であるα−オレフィン系モノマー(エチレン、プロピレ
ン、ブテン、ペンテン、ヘキセン、オクテン、デセン
等)から選ばれる2種以上によって得られる共重合体が
好ましく、この共重合体は単独或は混合して使用され
る。該表面層構成フィルム中に防曇剤を存在させる方法
としては、該表面層構成材自体の中に防曇剤を混入させ
ておく方法の他、基層フィルム中に適量の防曇剤を含有
させておき、積層後の拡散によって表面層構成フィルム
中に防曇剤を移行させる方法を採用することもできる。
この場合、基層フィルム内へ混入させる防曇剤の量は0.
3〜3重量%、より好ましくは0.4〜2.2重量%が好適で
あり、0.3重量%未満では表面層フィルム方向への拡散
移行量が不十分となる為表面層に十分な防曇性能を与え
ることができず、一方3重量%を超えると、表面層部側
の防曇性は十分に高められるものの、表面層フィルムが
白化現象を生じて商品価値が劣悪になる。ところが基層
フィルム中に0.3〜3重量%の防曇剤を含有させておい
て表面層フィルムと積層すると、基層フィルム中の防曇
剤が表面層フィルム方向へ徐々に拡散移行していく結
果、長期間に亘って良好な防曇性を持続することとな
る。
Next, the surface layer constituting material is required to have excellent antifogging properties over a long period of time due to the presence of the antifogging agent, and also needs to have excellent fusing sealability, which satisfies such requirements. For the surface layer constituent material for
A copolymer obtained from two or more selected from α-olefin monomers (ethylene, propylene, butene, pentene, hexene, octene, decene, etc.) is preferred, and these copolymers may be used alone or as a mixture. Is done. As a method of causing the antifogging agent to be present in the surface layer constituting film, other than a method of mixing the antifogging agent into the surface layer constituting material itself, an appropriate amount of the antifogging agent is contained in the base layer film. In addition, a method of transferring the anti-fogging agent into the surface layer constituting film by diffusion after lamination may be adopted.
In this case, the amount of the antifogging agent to be mixed into the base film is 0.
The content is preferably 3 to 3% by weight, more preferably 0.4 to 2.2% by weight, and if it is less than 0.3% by weight, the amount of diffusion and migration in the direction of the surface layer film becomes insufficient, so that the surface layer has sufficient anti-fog performance. On the other hand, if the content exceeds 3% by weight, the antifogging property on the surface layer portion side is sufficiently improved, but the surface layer film undergoes a whitening phenomenon and the commercial value becomes poor. However, when 0.3 to 3% by weight of the antifogging agent is contained in the base layer film and laminated with the surface layer film, the antifogging agent in the base layer film gradually diffuses and moves toward the surface layer film. Good antifogging properties will be maintained over a period of time.

前述の基層構成材及び表面層構成材から複合フィルム
を成形する為の手段は特に限定されず、共押出し法やイ
ンラインラミネート法の如き周知の方法によって行なわ
れることは先に述べた通りであり、また基層及び表面層
の肉厚も格別の制約はないが、経済性や物性等を加味し
て最も一般的なのは、基層:4〜200μm程度、表面層:0.
3〜8μm程度である。尚本発明で用いる複合のフィル
ムの最も基本的な複合形態は、表面層と基層を1層ずつ
積層した形態のものであるが、この基層の両面に表面層
を積層して両面に防曇性とヒートシール性を持たせた
り、或は基層の片側(表面層積層面とは反対側、但し両
表面層に防曇性やヒートシール性をもたせている場合は
該表面層のうちいずれか一方)に印刷等の加工を施する
ことも勿論可能であり、これらはすべて本発明の技術的
範囲に含まれる。
The means for forming the composite film from the base layer component and the surface layer component is not particularly limited, and is performed by a known method such as a co-extrusion method or an inline lamination method, as described above. The thicknesses of the base layer and the surface layer are not particularly limited, but the most common ones in consideration of economy and physical properties are the base layer: about 4 to 200 μm, and the surface layer: 0.1.
It is about 3 to 8 μm. The most basic composite form of the composite film used in the present invention is a form in which a surface layer and a base layer are laminated one by one. Or one side of the base layer (opposite to the surface layer laminating surface, but if both surface layers have anti-fog properties or heat sealing properties, either one of the surface layers ) May be subjected to processing such as printing, and these are all included in the technical scope of the present invention.

また基層及び表面層を構成するフィルム中には更に必
要に応じて滑剤、アンチブロッキング剤、酸化防止剤、
紫外線吸収剤、着色剤、帯電防止剤等を配合することも
でき、更に該複層フィルムは所望により1軸延伸若しく
は2軸延伸を施して物性を改善することもできる。
In addition, in the film constituting the base layer and the surface layer, if necessary, a lubricant, an anti-blocking agent, an antioxidant,
An ultraviolet absorber, a coloring agent, an antistatic agent and the like can be blended, and the multilayer film can be subjected to uniaxial stretching or biaxial stretching as required to improve physical properties.

(実施例) 実施例1、 エノキダケ100gを、水蒸気透過度40g/m2・24Hr・20
℃,酸素透過度5200cc/m2・24hr・atm・90%RH,炭酸ガ
ス透過度21000cc/m2・24hr・atm・90%RHで両面共に防
曇性の良好な下記の製法で製膜したフィルムを溶断シー
ルとして製袋したタテ220mm,ヨコ125mmの袋に詰め脱気
した後、袋口をヒートシールした。この包装物100袋を
ダンボール箱に詰め20℃80%RHで保存した。その結果を
第1表に示す。この袋の溶断シール強度は5.5kg・cm/15
mmであった。
(Example) Example 1, 100 g of Enoki mushroom was added to water vapor permeability of 40 g / m 2 · 24Hr · 20
° C., oxygen permeability 5200cc / m 2 · 24hr · atm · 90% RH, and a film with good following preparation of antifogging property on both sides with a carbon dioxide gas permeability 21000cc / m 2 · 24hr · atm · 90% RH The film was packed in a 220 mm long, 125 mm wide bag made as a fusing seal and deaerated, and the bag mouth was heat sealed. 100 bags of this package were packed in a cardboard box and stored at 20 ° C. and 80% RH. Table 1 shows the results. The fusing seal strength of this bag is 5.5kgcm / 15
mm.

比較例として、未延伸PPフィルム(以下CPPとする)
で同様に包装したもの、塩化ビニルストレッチフィルム
(以下PVCとする)でストレッチ包装したものを同時に
テストした結果を示す。
As a comparative example, unstretched PP film (hereinafter referred to as CPP)
2 shows the results of a test conducted simultaneously for the same package and that stretch-wrapped with a polyvinyl chloride stretch film (hereinafter referred to as PVC).

(フィルムの製法) エチレン、プロピレン共重合体(エチレン含有量:5
%)と、酢酸ビニル含有量が28%であるエチレン・酢酸
ビニル共重合体とを、前者65%、後者35%の比率で混合
してなる基層構成材と、プロピレン・ブテン−1共重合
体(ブテン−1含有量:18%)とブテン・エチレン共重
合体(エチレン含有量:3.5%)とを1:1の重量比率で配
合してなる混合組成物からなる表面層構成材(但し該表
面層構成材中には防曇剤として6%の高級脂肪酸エステ
ルモノグリセライドを混入させた)を使用し、共押出し
法によって、基層の両面に表面層の積層された複層フィ
ルムを作製し(押出温度:260℃、冷却:20℃)、引き続
いて縦延伸倍率3倍、横延伸倍率8倍の2軸延伸を施
し、更に両面にコロナ放電処理を行なって、基層18μ
m、表面層1μm×2(両面)の合計20μmの3層フィ
ルムを得た。このフィルムの片面(A)側の表面張力は
42ダイン/cm、他方面(B)側の表面張力は38ダイン/cm
であった。
(Film production method) Ethylene and propylene copolymer (ethylene content: 5
%) And an ethylene / vinyl acetate copolymer having a vinyl acetate content of 28% in a ratio of 65% for the former and 35% for the latter, and a propylene / butene-1 copolymer (Butene-1 content: 18%) and a butene-ethylene copolymer (ethylene content: 3.5%) in a 1: 1 weight ratio of a mixture composition comprising a surface layer constituting material (however, Using a 6% higher fatty acid ester monoglyceride as an anti-fogging agent in the surface layer constituting material), a multilayer film having a surface layer laminated on both sides of a base layer is produced by co-extrusion method (extrusion). (Temperature: 260 ° C, cooling: 20 ° C), followed by biaxial stretching at 3 times the longitudinal stretching ratio and 8 times the transverse stretching ratio.
m and a surface layer of 1 μm × 2 (both sides) to obtain a total of 20 μm three-layer film. The surface tension of one side (A) of this film is
42 dynes / cm, surface tension on the other side (B) side is 38 dynes / cm
Met.

(発明の効果) 本発明によれば、次のような格別優れた効果が得られ
る。
(Effects of the Invention) According to the present invention, the following excellent effects can be obtained.

(a) 本発明の複層フィルムは水蒸気、酸素ガス、及
び炭酸ガスの各透過度が適正に調整されており、又、包
装形態も適正になっている為、エノキダケは包装後も正
常な生理作用を持続することができ、鮮度保持期間を大
巾に延長することができる。
(A) In the multilayer film of the present invention, the permeability of water vapor, oxygen gas, and carbon dioxide gas is properly adjusted, and the packaging form is also appropriate. The effect can be maintained and the freshness holding period can be greatly extended.

(b) 本発明の複層フィルムは優れた防曇性及び防曇
持続性を有しているので、エノキダケの流通過程で曇り
部に凝集した水分により、エノキダケの鮮度低下が促進
される様な恐れもなく、消費者の手元に新鮮な状態で供
給することができる。
(B) Since the multilayer film of the present invention has excellent anti-fogging properties and anti-fogging continuity, it is likely that the freshness of the enoki mushroom is promoted by the water that is aggregated in the cloudy part during the distribution of the enoki mushroom. It can be supplied fresh to consumers without fear.

(c) 本発明の複層フィルムは、良好な溶断シール性
を有している為、製袋する場合でも容易であり、取扱い
時の破袋もない為、破袋による鮮度低下が発生しない。
(C) Since the multilayer film of the present invention has good fusing sealability, it is easy to make a bag, and since there is no breakage during handling, freshness does not decrease due to breakage.

Claims (6)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】下記(ア)〜(ウ)項を満足する複層フィ
ルムを用いて形成した袋体、または、断裁物にエノキダ
ケを包装し、密封することを特徴とするエノキダケの鮮
度保持方法。 (ア) 複層フィルムの水蒸気透過度が20〜150g/m2、2
4hr・40℃、酸素透過度が3000〜30,000cc/m2・24hr・at
m・20℃・90%RH、炭酸ガス透過度が12,000〜110,000cc
/m2・24hr・atm・20℃・90%RHであること。 (イ) 複層フィルムの少なくともエノキダケを接する
片面側表面に防曇剤が存在すること。 (ウ) 複層フィルムが溶断シール性を有すること。
1. A method for preserving the freshness of enoki mushrooms, which comprises packaging and sealing enoki mushrooms in a bag or cut material formed using a multilayer film satisfying the following items (a) to (c): . (A) The multilayer film has a water vapor permeability of 20 to 150 g / m 2 , 2
4hr · 40 ° C., oxygen permeability 3000~30,000cc / m 2 · 24hr · at
m ・ 20 ℃ ・ 90% RH 、 Carbon dioxide permeability 12,000 ~ 110,000cc
/ m 2 · 24hr · atm · 20 ℃ be · 90% RH. (A) An antifogging agent is present on at least one surface of the multilayer film in contact with the enoki mushroom. (C) The multilayer film has fusing sealability.
【請求項2】エノキダケが脱気した後、密封することを
特徴とする特許請求範囲第1項に記載の鮮度保持方法。
2. The freshness maintaining method according to claim 1, wherein the enoki mushroom is sealed after degassing.
【請求項3】270℃で溶断シールしたときに3.0kg−cm/1
5mm以上の溶断シール強度を示すものである特許請求の
範囲第1項又は第2項に記載の複層フィルムを用いるエ
ノキダケの鮮度保持方法。
3. When melt-sealed at 270 ° C., 3.0 kg-cm / 1
3. A method for maintaining freshness of enoki mushroom using a multilayer film according to claim 1 or 2, wherein the method has a fusing seal strength of 5 mm or more.
【請求項4】少なくともエノキダケに接する片面側表面
が、040℃の間で温度変化を繰り返す経過中防曇性を
示す複合フィルムを用いる特許請求の範囲第1〜3項に
記載のエノキダケの鮮度保持方法。
4. The freshness retention of the enoki mushroom according to claim 1, wherein a composite film exhibiting anti-fog properties during the course of repeating a temperature change between 040 ° C. and at least one side surface in contact with the enoki mushroom is used. Method.
【請求項5】複数フィルム基層構成材が、炭素数2〜10
のα−オレフィン系共重合体の1種以上:30〜90重量%
と酢酸ビニル、アクリル酸及びスチレンよりなる1種以
上のモノマー単位が全構成々分中の5〜80重量%を占め
る共重合体の1種以上:10〜70重量%との混合物である
特許請求の範囲第1〜4項のいずれかに記載のエノキダ
ケの鮮度保持方法。
5. The method according to claim 1, wherein the constituent material of the plurality of film base layers has 2 to 10 carbon atoms.
Α-olefin copolymer of at least one kind: 30 to 90% by weight
And a copolymer comprising at least one monomer unit consisting of vinyl acetate, acrylic acid and styrene, which accounts for 5 to 80% by weight of the total constituents, and 10 to 70% by weight. The method for maintaining freshness of Enoki mushroom according to any one of Items 1 to 4.
【請求項6】複層フィルムの表面層構成材が、炭素数2
〜10のα−オレフィン系共重合体である特許請求の範囲
第1〜5項のいずれかに記載の鮮度保持方法。
6. The surface layer constituting material of the multilayer film has a carbon number of 2
The freshness maintaining method according to any one of claims 1 to 5, wherein the α-olefin copolymer is an α-olefin-based copolymer.
JP33056487A 1987-12-26 1987-12-26 Enoki mushroom freshness preservation method Expired - Fee Related JP2580660B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33056487A JP2580660B2 (en) 1987-12-26 1987-12-26 Enoki mushroom freshness preservation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33056487A JP2580660B2 (en) 1987-12-26 1987-12-26 Enoki mushroom freshness preservation method

Publications (2)

Publication Number Publication Date
JPH01171434A JPH01171434A (en) 1989-07-06
JP2580660B2 true JP2580660B2 (en) 1997-02-12

Family

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JP3358268B2 (en) * 1994-02-07 2002-12-16 凸版印刷株式会社 Freshness preserving packaging material for mushrooms and method of preserving freshness
JPH08289726A (en) * 1995-04-21 1996-11-05 Dainippon Printing Co Ltd Package of raw shiitake (mushroom)
JPH09252715A (en) * 1996-03-22 1997-09-30 Sumitomo Bakelite Co Ltd Stripped chestnut pack and its preservation
CN1122070C (en) 1998-04-02 2003-09-24 智索股份有限公司 Film having gas permeability
JP2001072815A (en) 1999-09-07 2001-03-21 Chisso Corp Propylene-based resin composition
US6395071B1 (en) 1999-10-01 2002-05-28 Chisso Corporation Breathing film

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JPS5740781Y2 (en) * 1976-12-22 1982-09-07

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