JP6939352B2 - UV-shielding packaging film, its manufacturing method and packaging container - Google Patents
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Description
本発明は、紫外線遮光性包装用フィルム、その製造方法及び包装容器に関する。 The present invention relates to an ultraviolet light-shielding packaging film, a method for producing the same, and a packaging container.
食品や薬品を包装するフィルムに、これまでプラスチックフィルムが多く使われてきた。しかし、近年の地球環境保護の機運の高まりから、原料に石油を使わないフィルムについて研究開発がされている。
オブラートは澱粉からなるフィルムであるが、ガスバリア性が十分ではなく、包装された食品や薬品の長期安定性に改良の余地がある。
Plastic films have been widely used for packaging foods and chemicals. However, due to the recent increase in the momentum for protecting the global environment, research and development are being conducted on films that do not use petroleum as a raw material.
Oblates are films made of starch, but their gas barrier properties are not sufficient, and there is room for improvement in the long-term stability of packaged foods and chemicals.
疎水基をもつ高分子澱粉および／またはゼインを含むコート層によりガスバリア性を改善した可溶性フィルムがある（特許文献１）。 There is a soluble film in which the gas barrier property is improved by a coat layer containing a polymer starch having a hydrophobic group and / or zein (Patent Document 1).
食品や薬品の包装用フィルムは、包装する食品や薬品の種類や用途によっては、ガスバリア性の他に、紫外線遮光性が求められる。特許文献１に記載のコート層では、紫外線遮光性シール性が十分に得られなかった。 Films for packaging foods and chemicals are required to have ultraviolet light-shielding properties in addition to gas barrier properties, depending on the type and use of the foods and chemicals to be packaged. In the coat layer described in Patent Document 1, the ultraviolet light-shielding sealing property was not sufficiently obtained.
本発明は、上記の問題を有利に解決するものであり、原料に石油を使わないで環境負荷が小さく、可食でガスバリア性及び紫外線遮光性に優れた包装用フィルム、その製造方法及び包装容器を提供することを目的とする。 The present invention advantageously solves the above problems, is a packaging film that does not use petroleum as a raw material, has a small environmental load, is edible, and has excellent gas barrier properties and ultraviolet light shielding properties, a manufacturing method thereof, and a packaging container. The purpose is to provide.
発明者は、原料に石油を使わないで環境負荷が小さいフィルムについて研究開発を進めた結果、食品蛋白質から作成された蛋白質フィルムは、原料に石油を使わないので環境負荷が小さく、かつ、蛋白質フィルムのなかでも大豆蛋白質フィルムが、酸素バリア性に優れ、しかも紫外線遮光性を有することを見出し、本発明に至った。 As a result of research and development on a film that does not use oil as a raw material and has a low environmental load, the protein film made from food protein has a small environmental load because it does not use oil as a raw material, and is a protein film. Among them, the soybean protein film has been found to have an excellent oxygen barrier property and an ultraviolet light-shielding property, and has led to the present invention.
すなわち、本発明の紫外線遮光性包装用フィルムは、大豆蛋白質を含み、波長３８０ｎｍにおける光透過率が２０％以下であることを特徴とする。 That is, the ultraviolet-shielding packaging film of the present invention is characterized by containing soybean protein and having a light transmittance of 20% or less at a wavelength of 380 nm.
本発明の紫外線遮光性包装用フィルムにおいては、波可食性材料からなることが好ましい。また、シール性を有し、更にデッドホールド性を有し、食品用又は薬品用のフィルムとして好ましい。
本発明の包装容器は、上記の紫外線遮光性包装用フィルムを用いたことを特徴とする。
本発明の紫外線遮光性包装用フィルムの製造方法は、上記の紫外線遮光性包装用フィルムを製造する方法であって、大豆蛋白質を含む原料と水とを混合、攪拌したのち、平面に延ばし、その後に常温で乾燥することを特徴とする。
The ultraviolet light-shielding packaging film of the present invention is preferably made of a wave-edible material. Further, it has a sealing property and further has a dead hold property, and is preferable as a film for foods or chemicals.
The packaging container of the present invention is characterized by using the above-mentioned ultraviolet light-shielding packaging film.
The method for producing an ultraviolet-shielding packaging film of the present invention is the above-mentioned method for producing an ultraviolet-shielding packaging film, in which a raw material containing soybean protein and water are mixed, stirred, and then spread flat. It is characterized by being dried at room temperature.
本発明によれば、ガスバリア性及び紫外線遮光性に優れた包装用フィルムが得られた。 According to the present invention, a packaging film having excellent gas barrier properties and ultraviolet light shielding properties was obtained.
以下、本発明の紫外線遮光性包装用フィルム及び包装容器の実施形態を、より具体的に説明する。 Hereinafter, embodiments of the ultraviolet light-shielding packaging film and packaging container of the present invention will be described in more detail.
本発明の包装用フィルムは、大豆蛋白質を含む。大豆蛋白質は、大豆由来の蛋白質である。大豆蛋白質フィルムは、一例として水と、大豆蛋白質原料、例えば大豆蛋白質粉末と、グリセリンとを混合・攪拌した後、バットに混合液を流し込んで常温で乾燥させることによりフィルムとすることができる。 The packaging film of the present invention contains soybean protein. Soybean protein is a protein derived from soybean. The soybean protein film can be made into a film by mixing and stirring water, a soybean protein raw material, for example, soybean protein powder, and glycerin, and then pouring the mixed solution into a bat and drying at room temperature.
上記のようにして製造された大豆蛋白質フィルムは、酸素バリア性が高い。発明者が実際に大豆蛋白質フィルムを作成し、酸素透過度を測定したところ、食品用包装材のポリエチレンテレフタレート（ＰＥＴ）の約４倍の酸素バリア性を示した。この測定結果より、大豆蛋白質フィルムは、食品や薬品の包装材に用いることで食品や薬品の酸化を抑制するので、食品や薬品の長期保存性に優れたフィルムである。大豆蛋白質フィルムが上記の酸素バリア性を有していることは、これまで必ずしも明らかにされておらず、発明者の新規知見と考えられる。この新規知見によって、大豆蛋白質フィルムの用途の拡大を図ることができた。 The soybean protein film produced as described above has a high oxygen barrier property. When the inventor actually made a soybean protein film and measured the oxygen permeability, it showed about four times the oxygen barrier property of polyethylene terephthalate (PET), which is a food packaging material. From this measurement result, the soybean protein film is a film having excellent long-term storage stability of foods and chemicals because it suppresses oxidation of foods and chemicals when used as a packaging material for foods and chemicals. It has not always been clarified that the soybean protein film has the above-mentioned oxygen barrier property, and it is considered to be a new finding of the inventor. With this new knowledge, we were able to expand the applications of soy protein films.
また、上記大豆蛋白質フィルムは、褐色透明で波長３８０ｎｍ以下の紫外線領域で光遮光性を有する。具体的には波長３８０ｎｍにおける透過率が２０％以下である。好ましくは波長２２０〜３４０ｎｍにおける透過率が１％以下である。したがって、大豆蛋白質フィルムは、食品や薬品の包装材に用いることで包装体の内容物である食品を容易に視認することができると共に、紫外線による内容物の退色、変質を防止することができる。大豆蛋白質フィルムが上記の紫外線遮光性を有していることは、これまで必ずしも明らかにされておらず、発明者の新規知見と考えられる。この新規知見によって、大豆蛋白質フィルムの用途の拡大を図ることができた。 Further, the soybean protein film is brown and transparent and has a light-shielding property in an ultraviolet region having a wavelength of 380 nm or less. Specifically, the transmittance at a wavelength of 380 nm is 20% or less. Preferably, the transmittance at a wavelength of 220 to 340 nm is 1% or less. Therefore, when the soybean protein film is used as a packaging material for foods and chemicals, the food content of the package can be easily visually recognized, and discoloration and deterioration of the content due to ultraviolet rays can be prevented. It has not always been clarified that the soybean protein film has the above-mentioned ultraviolet light-shielding property, and it is considered to be a new finding of the inventor. With this new knowledge, we were able to expand the applications of soy protein films.
また、上記大豆蛋白質フィルムは、水に溶解することができる。したがって、上記大豆蛋白質フィルムは、食品用の原料を用いて可食性フィルムとすることができる。可食性フィルムとしての大豆蛋白質フィルムは、食品や薬品の包装材に用いることで食品や薬品を包装材で包装されたまま口に入れることができるので、包装を開封する手間を省くことができ、また、食品や薬品を取り出した後の包装体を廃棄する必要がないので廃棄物を減容することができ、原料に石油を用いないことと相まって環境負荷の低い包装体とすることができる。 In addition, the soybean protein film can be dissolved in water. Therefore, the soybean protein film can be made into an edible film by using a raw material for food. By using the soybean protein film as an edible film as a packaging material for foods and medicines, the foods and medicines can be put in the mouth while being wrapped in the packaging material, so that the trouble of opening the packaging can be saved. In addition, since it is not necessary to dispose of the packaging after taking out foods and chemicals, the volume of waste can be reduced, and the packaging can be made with a low environmental load in combination with the fact that oil is not used as a raw material.
また、上記大豆蛋白質フィルムは、シール性を有している。したがって、上記大豆蛋白質フィルムは、大豆蛋白質フィルム同士を対向させて加熱しながら加圧することによりヒートシールすることができる。よって、大豆蛋白質フィルムを食品や薬品の包装材に用いることで別途にシール層を備えた積層構造とすることを必ずしも要しない。もっとも、基材とシール層とを少なくとも備える積層フィルムの当該基材又は当該シール層に、上記大豆蛋白質フィルムを用いることを排除するものではない。大豆蛋白質フィルムが上記のシール性を有していることは、これまで知られておらず、発明者の新規知見と考えられる。この新規知見によって、大豆蛋白質フィルムの用途の拡大を図ることができた。 In addition, the soybean protein film has a sealing property. Therefore, the soybean protein film can be heat-sealed by pressing the soybean protein films while heating them so that they face each other. Therefore, it is not always necessary to use the soybean protein film as a packaging material for foods and chemicals to form a laminated structure with a separate sealing layer. However, it is not excluded that the soybean protein film is used for the base material or the seal layer of the laminated film having at least the base material and the seal layer. It has not been known so far that the soybean protein film has the above-mentioned sealing property, and it is considered to be a new finding of the inventor. With this new knowledge, we were able to expand the applications of soy protein films.
また、上記大豆蛋白質フィルムは、食用油等の油に長期間接しても変質や変形を生じない耐油性を有している。したがって、大豆蛋白質フィルムは、食品や薬品の包装材に用いることで、食用油を含む食品や調味料、例えばドレッシングの包装材等に用いることができる。大豆蛋白質フィルムが上記の耐油性を有していることは、これまで知られておらず、発明者の新規知見と考えられる。この新規知見によって、大豆蛋白質フィルムの用途の拡大を図ることができた。 In addition, the soybean protein film has oil resistance that does not cause deterioration or deformation even when indirectly infused with oil such as cooking oil for a long period of time. Therefore, by using the soy protein film as a packaging material for foods and chemicals, it can be used as a packaging material for foods and seasonings containing cooking oil, for example, dressings. It has not been known so far that the soybean protein film has the above-mentioned oil resistance, and it is considered to be a new finding of the inventor. With this new knowledge, we were able to expand the applications of soy protein films.
また、上記大豆蛋白質フィルムは、デッドホールド性を有している。デッドホールド性とは、容器や包装袋に関し、これを折り返して開封した際、開封したままの形状を保持でき、静置したままでは元の状態に戻らないという特性である。上記大豆蛋白質フィルムがデッドホールド性を有することにより、大豆蛋白質フィルムは、食品や薬品の包装材に用いることで、例えば、インスタントラーメンの蓋材に用いることができる。大豆蛋白質フィルムが上記のデッドホールド性を有していることは、これまで知られておらず、発明者の新規知見と考えられる。この新規知見によって、大豆蛋白質フィルムの用途の拡大を図ることができた。 In addition, the soybean protein film has a dead hold property. The dead-hold property is a characteristic of a container or a packaging bag that, when it is folded back and opened, it can retain its shape as it is opened and does not return to its original state when it is left to stand. Since the soybean protein film has a deadhold property, the soybean protein film can be used as a packaging material for foods and medicines, for example, as a lid material for instant noodles. It has not been known so far that the soybean protein film has the above-mentioned deadhold property, and it is considered to be a new finding of the inventor. With this new knowledge, we were able to expand the applications of soy protein films.
以上述べたように、上記の大豆蛋白質フィルムは、水溶性（可食性）ばかりでなく、酸素バリア性、紫外線遮光性、シール性、耐油性及びデッドホールド性を有している。これらの特性は、食品又は薬品の用途の包装材として好ましい。なかでも酸素バリア性、紫外線遮光性、シール性、耐油性及びデッドホールド性は、発明者が見出した特性と考えられ、包装材の用途をドレッシング用包装材や蓋材に拡大できる。 As described above, the above-mentioned soybean protein film has not only water solubility (edible property) but also oxygen barrier property, ultraviolet light shielding property, sealing property, oil resistance and dead hold property. These properties are preferred as packaging materials for food or pharmaceutical applications. Among them, oxygen barrier property, ultraviolet light shielding property, sealing property, oil resistance and dead hold property are considered to be the properties found by the inventor, and the use of the packaging material can be expanded to the packaging material for dressing and the lid material.
本発明の包装用フィルムは、大豆蛋白質を含むものである。大豆蛋白質からなるフィルムの他に、大豆蛋白質を主成分とし、大豆蛋白質よりも少量の添加剤を含む組成のフィルムであってもよい。添加剤としては、例えばグリセリンなどの保水剤やペクチンなどの多糖類やソルビトールなどの糖アルコールやアントシアニンなどの食用色素等がある。 The packaging film of the present invention contains soybean protein. In addition to the film made of soybean protein, a film having a composition containing soybean protein as a main component and a smaller amount of additives than soybean protein may be used. Examples of the additive include a water retention agent such as glycerin, a polysaccharide such as pectin, a sugar alcohol such as sorbitol, and an edible pigment such as anthocyanin.
本発明の包装用フィルムは、単層構造でもよいし、積層構造でもよい。積層構造の場合には、基材層とシール層とを少なくとも含む積層構造のうち、基材層が大豆蛋白質を含む層であってもよいし、シール層が大豆蛋白質を含む層であってもよい。 The packaging film of the present invention may have a single-layer structure or a laminated structure. In the case of a laminated structure, among the laminated structures including at least the base material layer and the seal layer, the base material layer may be a layer containing soybean protein, or the seal layer may be a layer containing soybean protein. good.
本発明の包装用フィルムは、厚さは特に限定されない。食品や薬品の包装用として使用可能な厚さであればよく、例えば、５μｍ〜１０００μｍ程度とすることができる。フィルムの厚さの調整は、例えは製造時における大豆蛋白質原料、グリセリン及び水の混合液をバット等の平面に延ばすときの膜厚で調整することができる。 The thickness of the packaging film of the present invention is not particularly limited. The thickness may be any thickness that can be used for packaging foods and chemicals, and can be, for example, about 5 μm to 1000 μm. The thickness of the film can be adjusted by, for example, the film thickness when the mixed solution of the soybean protein raw material, glycerin, and water at the time of production is spread on a flat surface such as a vat.
本発明の包装用フィルムの製造方法は、例えば以下に述べる方法がある。大豆蛋白質原料、例えば大豆蛋白質粉末と、保水剤としてのグリセリンと、水とを混合し、攪拌し、消泡のために冷蔵で約１日程度保存してから、バットに混合液を所定量で流し込み、常温、例えば２５℃、２４時間程度で乾燥させることにより、所定厚さのフィルムが得られる。大豆蛋白質粉末に対するグリセリンの配合割合は、質量割合で大豆蛋白質粉末１００ｇに対して、グリセリンを２０ｇ〜４０ｇ程度とするのが好適である。 The method for producing the packaging film of the present invention includes, for example, the methods described below. A soybean protein raw material, for example, soybean protein powder, glycerin as a water retention agent, and water are mixed, stirred, stored in a refrigerator for about 1 day for defoaming, and then a predetermined amount of the mixed solution is placed in a bat. A film having a predetermined thickness can be obtained by pouring and drying at room temperature, for example, 25 ° C. for about 24 hours. The mixing ratio of glycerin to the soybean protein powder is preferably about 20 g to 40 g of glycerin with respect to 100 g of the soybean protein powder in terms of mass ratio.
本発明の包装用フィルムを用いて、包装容器を製造することができる。包装容器は、例えば本発明の包装用フィルムの２枚を重ねて三方の縁部をヒートシールする三方袋や、四方の縁部をヒートシールする四方袋などを例示することができるが、包装容器は、これらの例に限定されない。 A packaging container can be manufactured using the packaging film of the present invention. Examples of the packaging container include a three-sided bag in which two sheets of the packaging film of the present invention are stacked and heat-sealed on three sides, a four-sided bag in which the four edges are heat-sealed, and the like. Is not limited to these examples.
以下、本発明を、実施例を用いてより詳細に説明するが、本発明はこの実施例により何ら限定されるものではない。 Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.
水６８ｇに、大豆蛋白質粉末９ｇとグリセリン３ｇとを混合し、攪拌し、冷蔵で１日保存し、バットに液を所定量流し込み、２５℃で２４時間乾燥して、厚さ４０μｍ及び１５０μｍの、厚さの異なる２種の褐色透明で柔軟性の高いフィルムを得た。 To 68 g of water, 9 g of soybean protein powder and 3 g of glycerin are mixed, stirred, stored in a refrigerator for 1 day, a predetermined amount of the liquid is poured into a bat, dried at 25 ° C. for 24 hours, and the thickness is 40 μm and 150 μm. Two kinds of brown transparent and highly flexible films having different thicknesses were obtained.
［フィルム特性の測定］
（酸素透過度）
作成した厚み１５０μｍの大豆蛋白質フィルムの酸素透過度を、ＪＩＳ−Ｋ７１２６Ｂ法に準拠した測定方法で測定した。
[Measurement of film characteristics]
(Oxygen permeability)
The oxygen permeability of the prepared soybean protein film having a thickness of 150 μm was measured by a measuring method based on the JIS-K7126B method.
（水への溶解性）
ビーカーに水を入れ、厚み１５０μｍの大豆蛋白質フィルムのサンプルを入れ、ゆるやかに攪拌させ２４時間後に確認した。
(Solubility in water)
Water was put in a beaker, a sample of a soybean protein film having a thickness of 150 μm was put in, and the mixture was gently stirred and confirmed after 24 hours.
（ヒートシール性）
ヒートシール機にて厚み１５０μｍの大豆蛋白質フィルムを重ね合わせて１２０℃でヒートシールを行い、シール性の有無を確認した。
(Heat sealability)
A soybean protein film having a thickness of 150 μm was laminated with a heat-sealing machine and heat-sealed at 120 ° C. to confirm the presence or absence of sealing property.
（紫外線遮光性）
紫外可視分光光度計を用いて２２０〜８００ｎｍにおけるフィルムの透過率を測定した。
(UV shading)
The transmittance of the film at 220 to 800 nm was measured using an ultraviolet-visible spectrophotometer.
［評価結果］
その結果、厚み１５０μｍの大豆蛋白質フィルムの酸素透過度が２．５９ｃｃ／ｍ２・ｄａｙ・ａｔｍであった。この酸素透過度は、通常のＰＥＴフィルムの約４倍の酸素バリア性を有することを示していた。
[Evaluation results]
As a result, the oxygen permeability of the soy protein film having a thickness of 150μm was 2.59cc / m 2 · day · atm . This oxygen permeability was shown to have about four times the oxygen barrier property of a normal PET film.
また、水への溶解性については、サンプル投入後すぐにフィルムが崩壊し溶解したことから、大豆蛋白質フィルムは水溶性を有することが確認された。 Regarding the solubility in water, the film disintegrated and dissolved immediately after the sample was added, confirming that the soybean protein film had water solubility.
また、油への溶解性については、サンプル投入後２４時間後も投入したままの形状を維持していることから、大豆蛋白質フィルムは耐油性を有することを確認した。 As for the solubility in oil, the soybean protein film was confirmed to have oil resistance because the shape of the soybean protein film was maintained as it was added 24 hours after the sample was added.
また、ヒートシール性については、大豆蛋白質フィルム同士をシールできることを確認した。 Regarding the heat-sealing property, it was confirmed that the soybean protein films could be sealed to each other.
表１、及び図１に、フィルムの透過率の測定結果を示す。 Table 1 and FIG. 1 show the measurement results of the transmittance of the film.
表１、及び図１から、紫外線遮光性については波長３８０ｎｍ以下で高い遮光性があることを確認した。 From Table 1 and FIG. 1, it was confirmed that the ultraviolet light-shielding property has a high light-shielding property at a wavelength of 380 nm or less.
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