JPH0630695A - Freshness retaining film - Google Patents
Freshness retaining filmInfo
- Publication number
- JPH0630695A JPH0630695A JP19224792A JP19224792A JPH0630695A JP H0630695 A JPH0630695 A JP H0630695A JP 19224792 A JP19224792 A JP 19224792A JP 19224792 A JP19224792 A JP 19224792A JP H0630695 A JPH0630695 A JP H0630695A
- Authority
- JP
- Japan
- Prior art keywords
- ethylene
- film
- vinyl acetate
- weight
- freshness
- 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.)
- Pending
Links
Landscapes
- Storage Of Fruits Or Vegetables (AREA)
- Laminated Bodies (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Wrappers (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は青果物や、花卉等(以
下、青果物等ということがある)の鮮度保持フィルムに
関する。更に詳しくは青果物や花卉等を包装袋内に包装
しその雰囲気中のO2、CO2濃度を最適化し鮮度を保持
するための密封包装用フィルムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a freshness-keeping film for fruits and vegetables and flowers (hereinafter sometimes referred to as fruits and vegetables). More specifically, the present invention relates to a hermetic packaging film for packaging fruits and vegetables, flowers, etc. in a packaging bag and optimizing the O 2 and CO 2 concentrations in the atmosphere to maintain freshness.
【0002】[0002]
【従来の技術】近年青果物や花卉等の鮮度に対する消費
者のニーズは高く、収穫後いかにしてその鮮度を保持す
るかは青果物等の栽培技術と共に非常に重要となってい
る。こうした要望に答えるべく鮮度保持に主眼をおいた
包装用フィルムの開発が進められており、例えば植物の
老化をもたらすエチレンを除去する方法(特開昭63−
309137、特開昭63−110186)、遠赤外線
を発生させて細胞を活性化させる方法(特開昭62−2
10973)、袋内の湿度調節(特開昭58−1936
78)、防曇効果による方法(特開昭62−1104
9)、抗菌効果による方法(特開昭61−14823
6)等様々な方策が提案されてきた。しかしながら多種
多様な青果物や花卉等に対応した効果的な鮮度保持方法
は見い出されていない。つまりそれぞれ個々の特殊なケ
ースには鮮度保持効果は見られるものの別の青果物等で
は同様の効果を得ることは非常に困難である。2. Description of the Related Art In recent years, consumers' needs for freshness of fruits and vegetables and flowers are high, and how to keep the freshness after harvesting is very important together with the cultivation technique of fruits and vegetables. In order to meet such demands, development of a packaging film focused on keeping freshness is under way, and for example, a method of removing ethylene which causes aging of plants (Japanese Patent Laid-Open No. 63-
309137, JP-A-63-110186), a method of activating cells by generating far infrared rays (JP-A-62-2).
10973) and humidity control in the bag (Japanese Patent Laid-Open No. 58-1936).
78), a method based on an antifogging effect (Japanese Patent Laid-Open No. 62-1104
9), a method based on an antibacterial effect (Japanese Patent Laid-Open No. 61-14823)
Various measures such as 6) have been proposed. However, an effective freshness-keeping method for a wide variety of fruits and vegetables has not been found. In other words, although a freshness-retaining effect can be seen in each individual special case, it is very difficult to obtain the same effect with other fruits and vegetables.
【0003】一般に青果物等の鮮度低下の要因は温度、
酸素、二酸化炭素のガス濃度、エチレン濃度、湿度、
光、細菌等である。この内最も影響の大きい温度を低温
障害の起こらない範囲内で低下さすことにより青果物等
の呼吸量及びエチレン発生量を減少させることは知られ
ている。更に、次に重要な要因である酸素、二酸化炭素
の濃度についても、個々の青果物についての最も鮮度保
持に有効なガス条件はCA貯蔵条件として提唱されてい
る。しかしこのCA貯蔵条件を機械的に作り出すための
CA貯蔵庫の設備は非常にコストがかかるため普及率は
低い。そこで、プラスチックフィルムで包装することに
より、青果物等の呼吸とフィルムのガス透過性とのバラ
ンスからCA貯蔵条件を簡単に作り出すフィルムの開発
が進められてきた(特開昭61−216640、同61
−227732、同63−102634)。しかしなが
ら単品のフィルムで種々のCA貯蔵ガス条件を作り出す
ことは不可能なため、ある特定の青果物には鮮度保持効
果はあるもののその他の青果物等に対して効果が得らな
いということが起こる。Generally, the cause of deterioration in freshness of fruits and vegetables is temperature,
Oxygen, carbon dioxide gas concentration, ethylene concentration, humidity,
Light, bacteria, etc. It is known that the respiration rate of fruits and vegetables and the ethylene production rate are reduced by lowering the most influential temperature within the range where low temperature damage does not occur. Furthermore, regarding the concentrations of oxygen and carbon dioxide, which are the next most important factors, the gas condition most effective for maintaining the freshness of individual fruits and vegetables has been proposed as the CA storage condition. However, the facility of the CA storage for mechanically creating the CA storage condition is very expensive, and thus the penetration rate is low. Therefore, the development of a film that can easily create CA storage conditions by wrapping with a plastic film to balance the breathability of fruits and vegetables and the gas permeability of the film has been promoted (Japanese Patent Laid-Open Nos. 61-216640 and 61-61640).
-227732, 63-102634). However, since it is impossible to create various CA storage gas conditions with a single film, it occurs that certain fruits and vegetables have a freshness-retaining effect but no effect on other fruits and vegetables.
【0004】また、青果物等の呼吸量に合わせてガス透
過量をコントロールする鮮度保持容器が報告されている
(特開昭63−152638、特開平1−30962
1)が、この方法ではガス不透過性容器内のガス透過性
パネルに使用されるフィルムの面積と種類によりコント
ロールを行うため、現在流通等に使用されている段ボー
ル箱、発泡スチロール箱等への適用ができないという問
題がある。Further, a freshness-keeping container for controlling the gas permeation amount according to the respiration amount of fruits and vegetables has been reported (JP-A-63-152638, JP-A-1-30962).
1) However, in this method, control is performed according to the area and type of the film used for the gas permeable panel in the gas impermeable container, so it is applied to corrugated cardboard boxes, styrofoam boxes, etc. currently used for distribution. There is a problem that you can not.
【0005】[0005]
【発明が解決しようとする課題】青果物のCA貯蔵条
件、呼吸量をもとに密封包装するだけで、袋内をCA貯
蔵条件にするフィルムの設計方法に関する本発明者らに
よる報告があるが(三菱化成R&DレヴューVol
5、No2(1991)、P84〜P90)、CA貯蔵
条件がO2≦6vol%かつCO2≦4vol%なる青果
物に最適なフィルムは、酸素透過度(Po2)に対する
二酸化炭素透過度(Pco2)の比PRが6≦PR≦1
2と大きな値を持つ必要があり、この特性値を満たし、
かつ実用的な包装用フィルムは現在無い。There is a report by the present inventors regarding a method of designing a film in which the bag has CA storage conditions only by hermetically packaging based on the CA storage conditions and respiration rate of fruits and vegetables ( Mitsubishi Kasei R & D Review Vol
5, No2 (1991), P84~P90 ), the optimum film fruits or vegetables CA storage condition is O 2 ≦ 6 vol% and CO 2 ≦ 4 vol%, the carbon dioxide permeability to oxygen permeability (Po 2) (Pco 2 ) Ratio PR is 6 ≦ PR ≦ 1
Must have a large value of 2 and must meet this characteristic value,
And there is currently no practical packaging film.
【0006】[0006]
【課題を解決するための手段】本発明の目的は、PR
(=Pco2/Po2)の値が5.0以上と大きく、か
つ、フィルムのブロッキングが少なく実用的な、野菜、
果物等の青果物、切花、鉢植え等の花卉、茸等の植物類
を包装してヒートシール、輪ゴム、ヒモ等で密封状態に
して用いる鮮度保持フィルムの提供にある。The object of the present invention is to provide PR
The value of (= Pco 2 / Po 2 ) is as large as 5.0 or more, the film blocking is small, and the vegetables are practical.
An object of the present invention is to provide a freshness-keeping film for packaging fruits and vegetables, cut flowers, flowers such as potted plants, plants such as mushrooms and sealing them with a heat seal, a rubber band, a string, etc.
【0007】本発明の要旨は、3層以上の多層フィルム
からなり、その中間層は(a)エチレン−酢酸ビニル共
重合体(EVA)またはエチレン−エチルアクリレート
共重合体(EEA)と(b)エチレン−酢酸ビニル共重
合体ケン化物(EVOH)との混合物からなり、内外両
表面層が低密度ポリエチレン(LDPE)、線状低密度
ポリエチレン(LLDPE)、酢酸ビニル含有率が8重
量%以下のエチレン−酢酸ビニル共重合体(EVA)、
ポリプロピレン(PP)、ポリスチレン(PS)、ポリ
ブタジエン(PBD)のいずれか、またはその混合物か
らなることを特徴とする鮮度保持フィルムに存する。The gist of the present invention consists of a multilayer film of three or more layers, the intermediate layer of which is (a) ethylene-vinyl acetate copolymer (EVA) or ethylene-ethyl acrylate copolymer (EEA) and (b). An ethylene-vinyl acetate copolymer saponified product (EVOH) is used as a mixture, and both inner and outer surface layers are low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and ethylene having a vinyl acetate content of 8% by weight or less. -Vinyl acetate copolymer (EVA),
A freshness-keeping film characterized by comprising polypropylene (PP), polystyrene (PS), polybutadiene (PBD), or a mixture thereof.
【0008】本発明に使用される、多層フィルムは、3
層以上の構成から成り、エチレン−酢酸ビニル共重合体
(EVA)またはエチレン−エチルアクリレート共重合
体(EEA)あるいはこれらの混合物とエチレン−酢酸
ビニル共重合体ケン化物(EVOH)との混合樹脂組成
物からなる中間層と他の樹脂からなる内表層、外表層、
そして必要に応じてそれらを接着するための接着層を有
する。厚み比は好ましくは中間層/中間層以外の層の和
=1/1〜5/1の範囲であり、中間層の特性によって
フィルム全体としてのPRを5以上とするものである。
中間層に使用するEVAの酢酸ビニル含有率(VA)は
好ましくは8〜40重量%のものを、またEEAのエチ
ルアクリレート含有率(EA)は好ましくは8〜40重
量%のものを用いる。中間層に用いた層をEVAまたは
EEA単層で用いた場合、PRは高いものとなるが同時
にO2、CO2透過率も大きくなってしまう。The multi-layer film used in the present invention is 3
A mixed resin composition of ethylene-vinyl acetate copolymer (EVA) or ethylene-ethyl acrylate copolymer (EEA) or a mixture thereof and a saponified product of ethylene-vinyl acetate copolymer (EVOH) Inner surface layer, outer surface layer made of other resin
And it has an adhesive layer for adhering them as needed. The thickness ratio is preferably in the range of intermediate layer / sum of layers other than intermediate layer = 1/1 to 5/1, and PR of the film as a whole is 5 or more depending on the characteristics of the intermediate layer.
The EVA used in the intermediate layer preferably has a vinyl acetate content (VA) of 8 to 40% by weight, and the EEA preferably has an ethyl acrylate content (EA) of 8 to 40% by weight. When the layer used as the intermediate layer is EVA or EEA single layer, the PR becomes high, but at the same time, the O 2 and CO 2 transmittances also increase.
【0009】多層フィルムでは、ガス透過率の大きな層
が全体のガス透過率に及ぼす影響は小さいため、多層フ
ィルムの中間層にEVAやEEAのみを用いたとき中間
層の多層フィルム全体のPRに対する影響力はO2、C
O2透過率が大きいため小さくなる。そこで中間層のP
Rを下げずにO2、CO2透過率を小さくし、PRに対す
る影響力を大きくするため、EVOHをEVAまたはE
EAに加える。EVOHの混合割合は中間層総重量の2
〜30重量%が好ましい。2重量%以下だとEVOHを
加えることにによるバリヤー性の上昇はあまり無く、3
0重量%以上のEVOHを加えるとEVAまたはEEA
中での分散性が悪く不透明化してしまう。透明性を保つ
ために、ポリエチレン(好ましくは低密度ポリエチレ
ン、線状低密度ポリエチレン)をEVAまたはEEAに
対し(EVA/ポリエチレン)1/0〜1/4の重量
比、好ましくは1/0〜1/1の重量比で加えても良
い。この低密度ポリエチレンまたは線状低密度ポリエチ
レは密度が0.94g/cm3以下、メルトインデック
スが0.5〜3.0g/10分(190°C)のものが
好ましく、エチレン単独重合体のほか、他のα−オレフ
ィンとの共重合体等も用い得る。また、これらの混合物
にさらに不飽和カルボン酸変性ポリオレフィンを加える
ことでEVAまたはEEA中でのEVOHの分散性を上
げ、さらにPR自体も上げることができる。In a multilayer film, a layer having a large gas permeability has a small effect on the overall gas permeability. Therefore, when EVA or EEA alone is used as the intermediate layer of the multilayer film, the effect of the intermediate layer on the PR of the entire multilayer film. Power is O 2 , C
It becomes small because the O 2 transmittance is large. So P in the middle layer
In order to reduce the O 2 and CO 2 permeabilities and increase the influence on PR without lowering R, EVOH is added to EVA or E.
Add to EA. The mixing ratio of EVOH is 2 of the total weight of the intermediate layer.
-30% by weight is preferred. If it is less than 2% by weight, the barrier property does not increase much due to the addition of EVOH.
EVA or EEA when 0% by weight or more of EVOH is added
It has poor dispersibility inside and becomes opaque. In order to maintain transparency, polyethylene (preferably low-density polyethylene, linear low-density polyethylene) is used in EVA or EEA (EVA / polyethylene) in a weight ratio of 1 / 0-1 / 4, preferably 1 / 0-1. You may add in the weight ratio of / 1. This low-density polyethylene or linear low-density polyethylene preferably has a density of 0.94 g / cm 3 or less and a melt index of 0.5 to 3.0 g / 10 min (190 ° C). , And copolymers with other α-olefins can also be used. Further, by adding an unsaturated carboxylic acid-modified polyolefin to these mixtures, the dispersibility of EVOH in EVA or EEA can be increased, and the PR itself can also be increased.
【0010】不飽和カルボン酸変性ポリオレフィンとは
アクリル酸、メタアクリル酸、マレイン酸、フマール
酸、イタコン酸等の不飽和カルボン酸又はその誘導体で
グラフト変性したポリオレフィン樹脂であり、特に無水
マレイン酸でグラフト変性したポリオレフィンが好まし
い。不飽和カルボン酸のグラフト量としては、ポリオレ
フィン100重量部に対して0.01〜5重量部、好ま
しくは0.02〜0.5重量部である。不飽和カルボン
酸変性ポリオレフィンは分散性等の点からメルトインデ
ックスが0.5〜20g/10分、好ましくは1.0〜
10g/10分程度のものが良い。不飽和カルボン酸変
性ポリオレフィンの混合量としてはEVAまたはEEA
とEVOHの混合物との割合にして2〜10重量%程度
が望ましく、2重量%より少なければEVOHの分散効
果が望めず、10重量%より多くても分散効果の一層の
向上は認められない。The unsaturated carboxylic acid-modified polyolefin is a polyolefin resin graft-modified with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid or a derivative thereof, and particularly grafted with maleic anhydride. Modified polyolefins are preferred. The amount of the unsaturated carboxylic acid grafted is 0.01 to 5 parts by weight, preferably 0.02 to 0.5 part by weight, based on 100 parts by weight of the polyolefin. The unsaturated carboxylic acid-modified polyolefin has a melt index of 0.5 to 20 g / 10 min, preferably 1.0 to
About 10 g / 10 minutes is preferable. The mixing amount of the unsaturated carboxylic acid-modified polyolefin is EVA or EEA.
The proportion of the mixture of EVOH and EVOH is preferably about 2 to 10% by weight, and if it is less than 2% by weight, the dispersing effect of EVOH cannot be expected, and if it exceeds 10% by weight, further improvement of the dispersing effect is not recognized.
【0011】EVOHはバリヤー性の上昇を目的とする
ことからそのエチレン含有量は25〜50モル%、ケン
化度90%以上のものが好ましい。内外両表面層には、
VAが8重量%以下のEVA、低密度ポリエチレン、線
状低密度ポリエチレン、ポリプロピレン、ポリスチレ
ン、ポリブタジエンのいずれか、またはそれらの混合物
を用いる。内外両表面層の主な機能は、ブロッキング防
止にある。中間層と内外両表面層の接着性が実用上悪い
ときはさらにその間に接着層を設ける。接着層としては
上述した不飽和カルボン酸変性ポリオレフィンが好適に
用い得る。EVOH is preferably one having an ethylene content of 25 to 50 mol% and a saponification degree of 90% or more because the purpose is to increase the barrier property. Both inside and outside surface layer,
Any of EVA, low density polyethylene, linear low density polyethylene, polypropylene, polystyrene, polybutadiene, or a mixture thereof having a VA of 8% by weight or less is used. The main function of both the inner and outer surface layers is to prevent blocking. When the adhesiveness between the intermediate layer and the inner and outer surface layers is poor in practical use, an adhesive layer is provided between them. As the adhesive layer, the above-mentioned unsaturated carboxylic acid-modified polyolefin can be preferably used.
【0012】ポリプロピレンやポリスチレン、ポリブタ
ジエンを表面層に用いる場合,EVAをベースにした不
飽和カルボン酸変性ポリオレフィンを接着剤として用い
るのが接着効果上好ましい。中間層とそれ以外の層の厚
み比は、1/1〜5/1が望ましい。1/1以下では中
間層の特性値の多層フィルム全体に対する影響力が小さ
すぎ、PRを充分大きくすることができず、5/1以上
ではフィルムの強度、成形性といった点で問題が大き
い。また、フィルムの全厚みは、包装内青果物、花卉等
の呼吸量や温度によって異なるが、実用上15μm〜1
00μmの範囲が望ましい。When polypropylene, polystyrene, or polybutadiene is used for the surface layer, it is preferable to use an EVA-based unsaturated carboxylic acid-modified polyolefin as an adhesive for the adhesive effect. The thickness ratio between the intermediate layer and the other layers is preferably 1/1 to 5/1. If the ratio is 1/1 or less, the influence of the characteristic value of the intermediate layer on the entire multilayer film is too small, and the PR cannot be sufficiently increased, and if it is 5/1 or more, problems such as film strength and moldability are large. The total thickness of the film varies depending on the respiration rate and temperature of fruits and vegetables in the package and the temperature, but it is practically 15 μm to 1 μm.
The range of 00 μm is desirable.
【0013】フィルムに成形加工する方法としては公知
の方法が利用できる。多層フィルムとするため、多層共
押出しのインフレーション法、Tダイ法によって成形す
る方法、あるいは、ラミネーションによる多層化もでき
る。尚、通常樹脂に添加される可塑剤、熱安定剤、酸化
防止剤、充填剤、滑剤、アンチブロッキング剤、紫外線
吸収剤、着色剤、改質材等は必要に応じて使用すること
はさしつかえない。また、鮮度保持上重要な、抗菌剤、
防曇剤、エチレン除去剤等の添加も可能である。A known method can be used for forming the film. Since it is a multilayer film, it can be formed by a multi-layer coextrusion inflation method, a T-die method, or a lamination method. Incidentally, plasticizers, heat stabilizers, antioxidants, fillers, lubricants, antiblocking agents, ultraviolet absorbers, colorants, modifiers, etc. usually added to resins may be used as necessary. . Also, an antibacterial agent, which is important for maintaining freshness,
It is also possible to add an antifogging agent, an ethylene removing agent, and the like.
【0014】[0014]
【実施例】次に実施例を挙げて本発明を説明するが、本
発明は、これら実施例に限定されるものではない。な
お、実施例中のPco2、Po2の測定は、加圧式ガス透
過率測定法(日本分光社製Gasperm−100型)
を用い23℃で行った。The present invention will be described below with reference to examples, but the present invention is not limited to these examples. In addition, the measurement of Pco 2 and Po 2 in the examples is performed by a pressure type gas permeability measuring method (Gasperm-100 type manufactured by JASCO Corporation).
At 23 ° C.
【0015】実施例1 内外両表面層にEVA(三菱油化社製V213K、VA
=5重量%)、中間層にEVA(三菱油化社製V403
E、VA=15重量%)80重量%、EVOH(日本合
成社製ET38、エチレン含有量38モル%)13重量
%、不飽和カルボン酸変性ポリオレフィン(三菱化成社
製AP730T)7重量%の混合物を用い、3層共押出
しインフレーション法で60μm厚の3層フィルムを成
形した。厚み比は1/8/1であった。このフィルムの
O2、CO2透過率Po2、Pco2を測定すると、EXAMPLE 1 EVA (V213K, VA manufactured by Mitsubishi Petrochemical Co., Ltd.) was used for both the inner and outer surface layers.
= 5% by weight), EVA (V403 manufactured by Mitsubishi Petrochemical Co., Ltd.) in the middle layer
E, VA = 15% by weight) 80% by weight, EVOH (ET38 manufactured by Nippon Gosei Co., Ltd., ethylene content 38 mol%) 13% by weight, unsaturated carboxylic acid modified polyolefin (AP730T manufactured by Mitsubishi Kasei Co., Ltd.) 7% by weight. By using the three-layer coextrusion inflation method, a three-layer film having a thickness of 60 μm was formed. The thickness ratio was 1/8/1. When the O 2 and CO 2 transmittances Po 2 and Pco 2 of this film were measured,
【0016】[0016]
【数1】 Po2=4030 [CC/Day.m2.atn] Pco2=25500 [CC/Day.m2.atn] となりPR=6.33であった。## EQU1 ## Po 2 = 4030 [CC / Day. m 2 . atn] Pco 2 = 25500 [CC / Day. m 2 . atn] and PR = 6.33.
【0017】実施例2 内外両表面層に低密度ポリエチレン(三菱化成社製F1
31)用いた以外は実施例1と同様にして60μm厚の
3層フィルムを成形した。このフィルムのO2、CO2透
過率Po2、Pco2を測定すると、Example 2 Low density polyethylene (F1 manufactured by Mitsubishi Kasei Co., Ltd.) was used for both the inner and outer surface layers.
31) A 3-layer film having a thickness of 60 μm was formed in the same manner as in Example 1 except that it was used. When the O 2 and CO 2 transmittances Po 2 and Pco 2 of this film were measured,
【0018】[0018]
【数2】 Po2=3900 [CC/Day.m2.atn] Pco2=22500 [CC/Day.m2.atn] となりPR=5.77であった。## EQU00002 ## Po 2 = 3900 [CC / Day. m 2 . atn] Pco 2 = 22500 [CC / Day. m 2 . atn] and PR = 5.77.
【0019】実施例3 中間層にEEA(三井デュポンポリケミカル社製 A7
10)を用いた以外は実施例2と同様にして60μm厚
の3層フィルムを成形した。このフィルムのO 2、CO2
透過率Po2、Pco2を測定すると、Example 3 EEA (A7 manufactured by DuPont Mitsui Polychemical Co., Ltd.) was used as an intermediate layer.
60 μm thick in the same manner as in Example 2 except that 10) was used.
Was molded into a three-layer film. O of this film 2, CO2
Transmittance Po2, Pco2Is measured,
【0020】[0020]
【数3】 Po2=4200 [CC/Day.m2.atn] Pco2=27100 [CC/Day.m2.atn] となりPR=6.45であった。## EQU00003 ## Po 2 = 4200 [CC / Day. m 2 . atn] Pco 2 = 27100 [CC / Day. m 2 . atn] and PR = 6.45.
【0021】実施例4 中間層にEEA(三井デュポンポリケミカル社製 A7
10)50重量%、低密度ポリエチレン(三菱化成社製
F131)30重量%、EVOH(日本合成社製ET3
8、エチレン含有量38モル%)13重量%、不飽和カ
ルボン酸変性ポリオレフィン(三菱化成社製AP730
T)7重量%の混合物を用いた以外は実施例3と同様に
して60μm厚の3層フィルムを成形した。このフィル
ムのO2、CO2透過率Po2、Pco2を測定すると、Example 4 EEA (A7 manufactured by Mitsui DuPont Polychemical Co., Ltd.) was used as the intermediate layer.
10) 50% by weight, low density polyethylene (F131 manufactured by Mitsubishi Kasei) 30% by weight, EVOH (ET3 manufactured by Nippon Gosei Co., Ltd.)
8, ethylene content 38 mol%) 13% by weight, unsaturated carboxylic acid modified polyolefin (AP730 manufactured by Mitsubishi Kasei)
T) A 60 μm-thick three-layer film was formed in the same manner as in Example 3 except that 7% by weight of the mixture was used. When the O 2 and CO 2 transmittances Po 2 and Pco 2 of this film were measured,
【0022】[0022]
【数4】 Po2=3730 [CC/Day.m2.atn] Pco2=23000 [CC/Day.m2.atn] となりPR=6.17であった。## EQU00004 ## Po 2 = 3730 [CC / Day. m 2 . atn] Pco 2 = 23000 [CC / Day. m 2 . atn] and PR = 6.17.
【0023】比較例1 実施例1において、中間層にEVA(V403E)のみ
を用いたこと以外は実施例1と同様の方法で3層フィル
ムを成形した。(厚さ60μm)Comparative Example 1 A three-layer film was formed in the same manner as in Example 1 except that only EVA (V403E) was used for the intermediate layer. (Thickness 60 μm)
【0024】[0024]
【数5】 Po2=6000 [CC/Day.m2.atn] Pco2=28000 [CC/Day.m2.atn] となりPR=4.67であった。であった。Po 2 = 6000 [CC / Day. m 2 . atn] Pco 2 = 28000 [CC / Day. m 2 . atn] and PR = 4.67. Met.
【0025】比較例2 EVA(V403E)単層フイルムをインフレーション
法で成形した。厚さは50μmであった。Comparative Example 2 EVA (V403E) single layer film was formed by inflation method. The thickness was 50 μm.
【0026】[0026]
【数6】 Po2=6480 [CC/Day.m2.atn] Pco2=34700 [CC/Day.m2.atn] となりPR=5.36であった。フィルムのブロッキン
グが激しく非実用的だった。[Equation 6] Po 2 = 6480 [CC / Day. m 2 . atn] Pco 2 = 34700 [CC / Day. m 2 . atn] and PR = 5.36. The film was heavily blocked and impractical.
【0027】比較例3 LDPE(三菱化成社製F131)単層フィルムをイン
フレーション法で成形した。厚さは50μmであった。Comparative Example 3 An LDPE (F131 manufactured by Mitsubishi Kasei) single layer film was formed by an inflation method. The thickness was 50 μm.
【0028】[0028]
【数7】 Po2=5550 [CC/Day.m2.atn] Pco2=19000 [CC/Day.m2.atn] となり、PR=3.42であった。## EQU00007 ## Po 2 = 5550 [CC / Day. m 2 . atn] Pco 2 = 19000 [CC / Day. m 2 . atn] and PR = 3.42.
【0029】実施例及び比較例のフィルムを用いてリン
ゴ(フジ)8個(2.4kg)を密封包装し、(30c
m×42cmの袋)23℃で20日間保存した。20日
後の袋内O2、CO2濃度、品質検査の結果を表−1に示
す。Using the films of Examples and Comparative Examples, 8 apples (Fuji) (2.4 kg) were hermetically sealed and packed (30 c
The bag was stored at 23 ° C. for 20 days. Table 1 shows the O 2 and CO 2 concentrations in the bag and the results of quality inspection after 20 days.
【0030】[0030]
【表1】 酸度:果汁100ml中のリンゴ酸質量 糖度:ブリックス糖度計値 硬度:果実硬度計(木屋製作所)値 食味:5段階評価(5良→1悪)[Table 1] Acidity: Mass of malic acid in 100 ml of fruit juice Sugar content: Brix sugar content meter hardness: Fruit hardness meter (Kiya Seisakusho) value Taste: 5 grade (5 good → 1 bad)
【0031】[0031]
【発明の効果】本発明により、青果物、花卉を包装する
だけで、袋内O2、CO2濃度を鮮度保持に最適な濃度と
し、かつ実用的な鮮度保持フィルムを提供することがで
きる。EFFECTS OF THE INVENTION According to the present invention, it is possible to provide a practical freshness-keeping film with the O 2 and CO 2 concentrations in the bag being optimal for keeping the freshness only by packaging the fruits and vegetables and the flowers.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 B32B 27/28 101 6122−4F 102 6122−4F B65D 65/40 E 9028−3E ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical display location B32B 27/28 101 6122-4F 102 6122-4F B65D 65/40 E 9028-3E
Claims (4)
の中間層は(a)エチレン−酢酸ビニル共重合体または
エチレン−エチルアクリレート共重合体と(b)エチレ
ン−酢酸ビニル共重合体ケン化物との混合物からなり、
内外両表面層が低密度ポリエチレン、線状低密度ポリエ
チレン、酢酸ビニル含有率が8重量%以下のエチレン−
酢酸ビニル共重合体、ポリプロピレン、ポリスチレン、
ポリブタジエンのいずれか、またはその混合物からなる
ことを特徴とする鮮度保持フィルム。1. A multi-layer film comprising three or more layers, the intermediate layer of which is (a) ethylene-vinyl acetate copolymer or ethylene-ethyl acrylate copolymer and (b) saponified ethylene-vinyl acetate copolymer. Consisting of a mixture of
Both the inner and outer surface layers are low density polyethylene, linear low density polyethylene, ethylene with a vinyl acetate content of 8% by weight or less
Vinyl acetate copolymer, polypropylene, polystyrene,
A freshness-keeping film comprising one of polybutadiene or a mixture thereof.
間層以外の層の和=1/1〜5/1であることを特徴と
する請求項1に記載の鮮度保持フィルム。2. The freshness-retaining film according to claim 1, wherein the multilayer film has a thickness constitution of intermediate layer / sum of layers other than intermediate layer = 1/1 to 5/1.
体の酢酸ビニル含有量が8〜40重量%、エチレン−エ
チルアクリレート共重合体のエチルアクリレート含有率
が8〜40重量%であり、エチレン−酢酸ビニル共重合
体ケン化物のエチレン含有率が25〜50モル%、ケン
化度90%以上であり、エチレン−酢酸ビニル共重合体
ケン化物が中間層総量の2〜30重量%混合されてなる
ことを特徴とする請求項1または請求項2に記載の鮮度
保持フィルム。3. The ethylene-vinyl acetate copolymer of the intermediate layer has a vinyl acetate content of 8 to 40% by weight, and the ethylene-ethyl acrylate copolymer has an ethyl acrylate content of 8 to 40% by weight. The saponified product of vinyl acetate copolymer has an ethylene content of 25 to 50 mol% and a saponification degree of 90% or more, and the saponified product of ethylene-vinyl acetate copolymer is mixed in an amount of 2 to 30% by weight based on the total amount of the intermediate layer. The freshness preservation film according to claim 1 or 2, characterized in that.
レフィンを2〜10重量%混合することを特徴とする請
求項1〜請求項3のいずれかに記載の鮮度保持フィル
ム。4. The freshness-keeping film according to claim 1, wherein the intermediate layer is mixed with 2 to 10% by weight of an unsaturated carboxylic acid-modified polyolefin.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19224792A JPH0630695A (en) | 1992-07-20 | 1992-07-20 | Freshness retaining film |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19224792A JPH0630695A (en) | 1992-07-20 | 1992-07-20 | Freshness retaining film |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0630695A true JPH0630695A (en) | 1994-02-08 |
Family
ID=16288118
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19224792A Pending JPH0630695A (en) | 1992-07-20 | 1992-07-20 | Freshness retaining film |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0630695A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100777939B1 (en) * | 2007-01-17 | 2007-11-28 | 안병석 | Vinyl type packing material for pallet wrapping |
JP2010120683A (en) * | 2008-11-20 | 2010-06-03 | Sumitomo Bakelite Co Ltd | Freshness-keeping packaging bag for cut flowers of chrysanthemum and freshness-keeping preservation method for the same |
CN103010590A (en) * | 2012-12-29 | 2013-04-03 | 上海海洋大学 | Fresh-keeping packaging film bag with automatic regulation function |
CN113635640A (en) * | 2021-08-13 | 2021-11-12 | 四川农业大学 | Anticorrosive label based on 4D prints |
-
1992
- 1992-07-20 JP JP19224792A patent/JPH0630695A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100777939B1 (en) * | 2007-01-17 | 2007-11-28 | 안병석 | Vinyl type packing material for pallet wrapping |
JP2010120683A (en) * | 2008-11-20 | 2010-06-03 | Sumitomo Bakelite Co Ltd | Freshness-keeping packaging bag for cut flowers of chrysanthemum and freshness-keeping preservation method for the same |
CN103010590A (en) * | 2012-12-29 | 2013-04-03 | 上海海洋大学 | Fresh-keeping packaging film bag with automatic regulation function |
CN113635640A (en) * | 2021-08-13 | 2021-11-12 | 四川农业大学 | Anticorrosive label based on 4D prints |
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