JP2005288865A - Laminated film - Google Patents

Laminated film Download PDF

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Publication number
JP2005288865A
JP2005288865A JP2004106948A JP2004106948A JP2005288865A JP 2005288865 A JP2005288865 A JP 2005288865A JP 2004106948 A JP2004106948 A JP 2004106948A JP 2004106948 A JP2004106948 A JP 2004106948A JP 2005288865 A JP2005288865 A JP 2005288865A
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laminated film
oxygen
polyurethane resin
moisture
thermoplastic polyurethane
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Takahiro Shigemitsu
貴裕 重光
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Sekisui Film Co Ltd
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Sekisui Film Co Ltd
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Priority to JP2004106948A priority Critical patent/JP2005288865A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated film which has such film functions as appropriate degree of water vapor permeability or oxygen permeability, has no possibility of contaminating a food or the like with a moisture containing a rust generated with a deoxidizer and the moisture, and can be used as a packaging material for the deoxidizer. <P>SOLUTION: The laminated film is characterized by comprising a thermoplastic polyurethane resin layer with the degree of water vapor transmission of 500-10,000 g/m<SP>2</SP>×24 h and a nonwoven fabric layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、脱酸素剤の包装等に用いられる積層フィルムに関する。   The present invention relates to a laminated film used for packaging of an oxygen scavenger and the like.

食品等を保存する技術として、脱酸素剤が用いられることは従来から知られ、酸素ガスバリア性の密封袋または密封容器内に食品等と脱酸素剤とを共存させ密封系内の酸素を除去させ、食品等の酸化や細菌等の繁殖を抑える技術であり広く用いられている。これに用いられる脱酸素剤は、鉄粉を主剤とするものが一般的に用いられている。   It has been known that oxygen scavengers are used as a technique for preserving foods, etc., and oxygen in a sealed system is removed by allowing foods and oxygen scavengers to coexist in oxygen gas barrier sealed bags or containers. It is a widely used technology that suppresses the oxidation of foods and the growth of bacteria. As the oxygen scavenger used for this, those mainly composed of iron powder are generally used.

上記の鉄粉を主剤とする脱酸素剤は、鉄粉の酸化反応を開始するには水の存在が必要である。
そのために、紙と有孔ポリエチレンをラミネートした包材等の実質的に孔の開いた通気性材料からなる積層材料が、脱酸素剤の包装材として開示されている(例えば、特許文献1参照)。
The oxygen scavenger based on the above iron powder requires the presence of water in order to start the oxidation reaction of the iron powder.
For this purpose, a laminated material made of a breathable material having a substantially open hole, such as a packaging material obtained by laminating paper and porous polyethylene, is disclosed as a packaging material for an oxygen scavenger (for example, see Patent Document 1). .

また、特許文献2には、孔のあいた通気性包装材料で脱酸素剤を包装した酸素吸収包装体と、水蒸気透過性包装材料で水を包装した水包装体を、非通気性包装材料からなる外装体中に密封したものが開示されている。   Further, Patent Document 2 includes an oxygen-absorbing packaging body in which an oxygen scavenger is packaged with an air-permeable packaging material having a hole, and a water packaging body in which water is packaged with a water-vapor-permeable packaging material. What was sealed in the exterior body is disclosed.

特許第2836126号公報Japanese Patent No. 2836126 特許第2503560号公報Japanese Patent No. 2503560

しかしながら、孔の開いた通気性材料で脱酸素剤を包装した上記の方法では、魚等の水分を含んだ食品と脱酸素剤を同封した際に、食品中の水分が泡剤の孔から入り脱酸素剤として一般的に用いられる鉄粉等に水分が接することにより発生する錆びを含んだ水分が、脱酸素剤の包装の外ににじみ出ることによって、食品そのものにこの錆びを含んだ水分が触れてしまい、食品が汚染してしまうという問題があった。   However, in the above method in which the oxygen scavenger is packaged with a breathable material with a hole, when the food containing water such as fish and the oxygen scavenger is enclosed, the moisture in the food enters through the pores of the foam. Moisture containing rust generated when water comes into contact with iron powder or the like generally used as an oxygen scavenger oozes out of the oxygen scavenger packaging, and the food containing the rust touches the food itself. As a result, there is a problem that the food is contaminated.

本発明の目的は、上記問題点に鑑み、適度な透湿度と酸素透過度のフィルム機能を有し、且つ脱酸素剤と水分とで発生する錆びを含んだ水分により食品等を汚染することのない脱酸素剤用包装材等として用いることのできる積層フィルムを提供することにある。   In view of the above problems, the object of the present invention is to have a film function with an appropriate moisture permeability and oxygen permeability, and to contaminate foods and the like with moisture containing rust generated by an oxygen scavenger and moisture. Another object is to provide a laminated film that can be used as a packaging material for oxygen scavengers.

本発明による積層フィルムは、透湿度が500〜10000g/m2・24hである熱可塑性ポリウレタン樹脂層と、不織布層とからなることを特徴とする。 The laminated film according to the present invention is characterized by comprising a thermoplastic polyurethane resin layer having a moisture permeability of 500 to 10,000 g / m 2 · 24 h and a nonwoven fabric layer.

本発明による熱可塑性ポリウレタン樹脂層においては、透湿度が500〜10000g/m2・24hに限定される。
透湿度が500g/m2・24h未満であれば、脱酸素機能を発現するだけの十分な水分量が得られず、逆に、透湿度が10000g/m2・24hを超えれば、過剰な水分が包装材の外に出てしまい同封している食品等を汚染してしまう危険性がある。
In the thermoplastic polyurethane resin layer according to the present invention, the moisture permeability is limited to 500 to 10,000 g / m 2 · 24 h.
If the moisture permeability is less than 500g / m 2 · 24h, sufficient amount of water only express deoxidizing function can not be obtained, conversely, moisture permeability if it exceeds 10000g / m 2 · 24h, excess water May come out of the packaging material and contaminate the enclosed food.

本発明において、熱可塑性ポリウレタン樹脂としては透湿度が500〜10000g/m2・24hであれば特に限定はされず、例えば、ポリエーテル系ポリウレタン樹脂、ポリエステル系ポリウレタン樹脂、ポリカーボネート系ポリウレタン樹脂等が挙げられる。
上記熱可塑性ポリウレタン系樹脂は、二官能性ポリオールとジイソシアネートおよびグリコールとを主原料としてなる分子構造中にウレタン基を含有する高分子のうち、熱可塑性を有するものである。
上記熱可塑性ポリウレタン系樹脂は、使用される上記二官能性ポリオール等の主原料の種類によって区別され、その具体例としては、特に限定されるものではないが、例えば、ポリエーテル系ポリウレタン樹脂、ポリエステル系ポリウレタン樹脂、ポリカーボネート系ポリウレタン樹脂等が挙げられる。これらの熱可塑性ポリウレタン系樹脂は、単独で用いられても良いし、2種類以上が併用されても良い。また、本発明の範囲であれば、成形性を改善する目的で、ポリウレタン系樹脂以外の材料を含有しても良い。
本発明で言う透湿度とは、JIS Z 0208「防湿包装材料の透湿度試験方法(カップ法)」の条件Bに準拠して測定された透湿度を意味する。
In the present invention, the thermoplastic polyurethane resin is not particularly limited as long as the moisture permeability is 500 to 10,000 g / m 2 · 24 h, and examples thereof include polyether polyurethane resins, polyester polyurethane resins, and polycarbonate polyurethane resins. It is done.
The thermoplastic polyurethane-based resin has thermoplasticity among polymers having a urethane group in a molecular structure mainly composed of a bifunctional polyol, diisocyanate and glycol.
The thermoplastic polyurethane resin is distinguished by the type of the main raw material such as the bifunctional polyol used, and specific examples thereof are not particularly limited. For example, polyether polyurethane resin, polyester And polyurethane-based polyurethane resins and polycarbonate-based polyurethane resins. These thermoplastic polyurethane resins may be used alone or in combination of two or more. Moreover, if it is the range of this invention, you may contain materials other than a polyurethane-type resin in order to improve a moldability.
The moisture permeability referred to in the present invention means the moisture permeability measured according to the condition B of JIS Z 0208 “Moisture-proof packaging material moisture permeability test method (cup method)”.

本発明において、不織布としては特に限定はされず、例えば、ポリプロピレン、レーヨン、ポリエステル、ナイロン、ポリビニルアルコール、変性ポリビニルアルコール、アクリル、広葉樹パルプ、針葉樹パルプ、ポリエチレン、エチレン−酢酸ビニルコポリマー、絹、羊毛、綿、麻等及びこれらの混合物よりなる繊維からなる不織布が挙げられる。これらの中でも、熱可塑性ポリウレタン樹脂との接着強度及び、透湿度、酸素透過度より、ポリエステル、ナイロンの不織布が好ましい。   In the present invention, the nonwoven fabric is not particularly limited. For example, polypropylene, rayon, polyester, nylon, polyvinyl alcohol, modified polyvinyl alcohol, acrylic, hardwood pulp, softwood pulp, polyethylene, ethylene-vinyl acetate copolymer, silk, wool, Nonwoven fabrics made of fibers made of cotton, hemp, etc. and mixtures thereof can be mentioned. Among these, non-woven fabrics of polyester and nylon are preferable from the viewpoint of adhesive strength with a thermoplastic polyurethane resin, moisture permeability, and oxygen permeability.

上記熱可塑性ポリウレタン樹脂層においては、酸素透過度が500cc/m2・24h以上であることが好ましい。酸素透過度が500cc/m2・24h未満では、内包された酸素吸収剤が酸素を十分に吸収できず、食品等が酸化劣化してしまう恐れがある。
本発明における酸素透過度とは、MOCON社製酸素透過度試験機「OX−TRAN」
を用いて、23℃90%RHの条件下で測定した値をいう。
In the thermoplastic polyurethane resin layer, the oxygen permeability is preferably 500 cc / m 2 · 24 h or more. If the oxygen permeability is less than 500 cc / m 2 · 24 h, the encapsulated oxygen absorbent cannot sufficiently absorb oxygen, and the food or the like may be oxidized and deteriorated.
The oxygen permeability in the present invention is an oxygen permeability tester “OX-TRAN” manufactured by MOCON.
Is a value measured under conditions of 23 ° C. and 90% RH.

本発明の積層フィルムは、上記熱可塑性ポリウレタン樹脂層と不織布層とが積層されてなるので、食品に直接接触するところで空隙ができ、効率的に酸素吸収性能が発揮されるだけでなく、製造上の取り扱い時に、熱可塑性ポリウレタン樹脂単層で使用するのと比較して、ブロッキング等が起こりにくくなるため有効である。   Since the laminated film of the present invention is formed by laminating the thermoplastic polyurethane resin layer and the non-woven fabric layer, voids are formed in direct contact with food, and not only oxygen absorption performance is efficiently exhibited, but also in production. This is effective because it is less likely to cause blocking or the like when used with a single layer of thermoplastic polyurethane resin.

本発明の積層フィルムの製造方法としては特に限定されないが、例えば、熱可塑性ポリウレタン樹脂をTダイ法もしくはインフレーション法で製膜した後、不織布と接着剤もしくは熱を用いて貼りあわせる方法、または、不織布上に、溶融した熱可塑性ポリウレタン樹脂を直接押出ラミネートする方法等が挙げられる。   Although it does not specifically limit as a manufacturing method of the laminated | multilayer film of this invention, For example, after forming a thermoplastic polyurethane resin into a film by the T-die method or an inflation method, it bonds together using a nonwoven fabric and an adhesive agent or heat, or a nonwoven fabric Further, a method of directly extruding and laminating a molten thermoplastic polyurethane resin can be used.

本発明の積層フィルムは上述の通りの構成であり、適度な透湿度と酸素透過度のフィルム機能を有しているので、脱酸素剤と水分とで発生する錆びを含んだ水分により食品等を汚染されることのない脱酸素剤用包装材等として用いることのできる。   The laminated film of the present invention is configured as described above, and has a film function with appropriate moisture permeability and oxygen permeability, so foods and the like can be obtained by moisture containing rust generated by an oxygen scavenger and moisture. It can be used as a packaging material for oxygen scavengers that is not contaminated.

以下に実施例を掲げて本発明の態様を更に詳しく説明するが、本発明はこれら実施例のみに限定されるものではない。   The embodiments of the present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

(実施例1)
厚み50μのエーテル系ポリウレタン樹脂層と、ポリエステルからなる不織布とを接着剤を用いてドライラミネートして積層フィルムを作成した。
(Example 1)
A laminated film was prepared by dry laminating an ether polyurethane resin layer having a thickness of 50 μm and a nonwoven fabric made of polyester using an adhesive.

(実施例2)
厚み50μのエステル系ポリウレタン樹脂層と、ポリエステルからなる不織布とを接着剤を用いてドライラミネートして積層フィルムを作成した。
(Example 2)
A laminated film was prepared by dry laminating a 50 μm thick ester polyurethane resin layer and a nonwoven fabric made of polyester using an adhesive.

(比較例1)
厚み50μで、ポリエチレンに無機物を充填したものを延伸してなるポリエチレン系多孔質フィルムと、ポリエステルからなる不織布とを接着剤を用いてドライラミネートして積層フィルムを作成した。
(Comparative Example 1)
A laminated film was prepared by dry laminating a polyethylene-based porous film having a thickness of 50 μm obtained by stretching polyethylene filled with an inorganic material and a nonwoven fabric made of polyester using an adhesive.

(比較例2)
厚み50μの有孔ポリエチレンフィルムと、ポリエステルからなる不織布とを接着剤を用いてドライラミネートして積層フィルムを作成した。
(Comparative Example 2)
A laminated film was prepared by dry laminating a perforated polyethylene film having a thickness of 50 μm and a nonwoven fabric made of polyester using an adhesive.

(比較例3)
厚み50μの無孔ポリエチレンフィルムと、ポリエステルからなる不織布とを接着剤を用いてドライラミネートして積層フィルムを作成した。
(Comparative Example 3)
A laminated film was prepared by dry laminating a non-porous polyethylene film having a thickness of 50 μm and a nonwoven fabric made of polyester using an adhesive.

実施例1〜2及び比較例1〜3で得られた積層フィルムの性能を評価した。その結果は表1に示すとおりであった。   The performance of the laminated film obtained in Examples 1-2 and Comparative Examples 1-3 was evaluated. The results are shown in Table 1.

Figure 2005288865
Figure 2005288865

Claims (3)

透湿度が500〜10000g/m2・24hである熱可塑性ポリウレタン樹脂層と、不織布層とからなることを特徴とする積層フィルム。 A laminated film comprising a thermoplastic polyurethane resin layer having a moisture permeability of 500 to 10,000 g / m 2 · 24 h and a nonwoven fabric layer. 熱可塑性ポリウレタン樹脂層の酸素透過度が500cc/m2・24h以上であることを特徴とする請求項1記載の積層フィルム。 The laminated film according to claim 1, wherein the thermoplastic polyurethane resin layer has an oxygen permeability of 500 cc / m 2 · 24 h or more. 脱酸素剤包装に用いられることを特徴とする請求項1又は2記載の積層フィルム。
The laminated film according to claim 1 or 2, which is used for oxygen scavenger packaging.
JP2004106948A 2004-03-31 2004-03-31 Laminated film Pending JP2005288865A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008260213A (en) * 2007-04-12 2008-10-30 Sekisui Film Kk Low moisture-permeable laminated body

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008260213A (en) * 2007-04-12 2008-10-30 Sekisui Film Kk Low moisture-permeable laminated body

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