JP2017100800A - 食品包装用フィルム - Google Patents

食品包装用フィルム Download PDF

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Publication number
JP2017100800A
JP2017100800A JP2016052589A JP2016052589A JP2017100800A JP 2017100800 A JP2017100800 A JP 2017100800A JP 2016052589 A JP2016052589 A JP 2016052589A JP 2016052589 A JP2016052589 A JP 2016052589A JP 2017100800 A JP2017100800 A JP 2017100800A
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Japan
Prior art keywords
mass
film
colorant
food packaging
vinylidene chloride
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Granted
Application number
JP2016052589A
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English (en)
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JP7028544B2 (ja
Inventor
裕幸 宮田
Hiroyuki Miyata
裕幸 宮田
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Showa Denko Materials Co Ltd
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Hitachi Chemical Co Ltd
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Abstract

【課題】食品に混入した場合でも識別可能であり、かつ製膜性及び生産性に優れる食品包装用フィルムを提供すること。
【解決手段】塩化ビニリデン系樹脂と、青色着色剤と、白色着色剤と、を含有する食品包装用フィルム。
【選択図】なし

Description

本発明は、食品包装用フィルムに関する。
従来、食品包装用フィルムは、ホテル、レストラン等において業務用として、あるいは家庭において食品保存時、調理時等に幅広く使用されている。食品包装用フィルムに対しては、使用時の利便性向上のために種々の改良が行われている。例えば特許文献１には、包装される食材及び容器とフィルムとの同化を防ぐと共に、フィルムの端面を容易に判別でき、かつ該端面におけるフィルム同士、又は食材及び容器とフィルムとの必要以上の密着を防止すること等を目的として、フィルムの所定の箇所にエンボス加工が施されてなる食品包装用フィルムが開示されている。
特開２００３−６３５５５号公報
本発明は、食品に混入した場合でも識別可能であり、かつ製膜性及び生産性に優れる食品包装用フィルムを提供することを目的とする。
本発明は、塩化ビニリデン系樹脂と、青色着色剤と、白色着色剤と、を含有する食品包装用フィルムを提供する。
青色着色剤の含有量は、好ましくはフィルム全量基準で０．６〜２．４質量％である。
白色着色剤の含有量は、好ましくはフィルム全量基準で０．１２〜０．６５質量％である。
本発明によれば、食品に混入した場合でも識別可能であり、かつ製膜性及び生産性に優れる食品包装用フィルムを提供することができる。
本実施形態に係るフィルムは、塩化ビニリデン系樹脂と、青色着色剤と、白色着色剤と、を含有し、食品包装用フィルムとして好適に用いられる。
塩化ビニリデン系樹脂は、例えば、塩化ビニリデンと、塩化ビニリデンと共重合可能なその他のモノマーとをモノマー単位として含む共重合体であってよい。その他のモノマーは、塩化ビニル、アクリル酸と炭素数１〜８のアルコールとのアクリル酸エステル、メタクリル酸と炭素数１〜８のアルコールとのメタクリル酸エステル、脂肪族カルボン酸のビニルエステル、不飽和脂肪族カルボン酸、オレフィン、ビニルエーテル等であってよい。
塩化ビニリデン系樹脂における塩化ビニリデン単位の含有量は、モノマー単位の全量を基準として、例えば、６０質量％以上、７０質量％以上、又は８０質量％以上であってよく、９８質量％以下、又は９７質量％以下であってよい。塩化ビニリデン系樹脂におけるその他のモノマー単位の含有量は、モノマー単位の全量を基準として、例えば、２質量％以上、又は３質量％以上であってよく、４０質量％以下、３０質量％以下、又は２０質量％以下であってよい。
塩化ビニリデン系樹脂の重量平均分子量は、例えば、４００００〜１８００００、６００００〜１６００００、又は８００００〜１４００００であってよい。塩化ビニリデン系樹脂の重量平均分子量は、ＧＰＣ法により、分子量既知のポリスチレンを標準物質として測定することができる。
塩化ビニリデン系樹脂の含有量は、フィルム全量基準で、例えば７０質量％以上、又は８０質量％以上であってよい。フィルムは、塩化ビニリデン系樹脂に加えて、その他の塩化ビニリデン系樹脂を更に含有していてもよい。
青色着色剤は、例えば、可視光領域（３８０〜７５０ｎｍ）における最大吸収波長が６００〜７５０ｎｍに存在する着色剤である。青色着色剤の可視光領域における最大吸収波長での吸光度は、４７０ｎｍでの吸光度の好ましくは２倍以上、より好ましくは３倍以上である。具体的には、青色着色剤は、銅フタロシアニン（銅フタロシアニンブルー）、ヘキサシアノ鉄（ｉｉ）酸鉄（ＩＩＩ）、酸化第一コバルト・酸化アルミニウム混合物、インジゴ又はウルトラマリンであってよい。これらの青色着色剤は、１種単独又は２種以上を組み合わせて用いられる。
青色着色剤の含有量は、識別性に更に優れる観点から、好ましくは、フィルム全量基準で、０．６質量％以上、０．７質量％以上、０．８質量％以上、０．９質量％以上、又は１．０質量％以上である。青色着色剤の含有量は、製膜性及び生産性に更に優れる観点から、好ましくは、フィルム全量基準で、２．４質量％以下、２．３質量％以下、２．２質量％以下、２．１質量％以下、又は２．０質量％以下である。青色着色剤の含有量は、識別性、製膜性及び生産性のすべてで更に優れる観点から、好ましくは、フィルム全量基準で、０．６〜２．４質量％、０．６〜２．３質量％、０．６〜２．２質量％、０．６〜２．１質量％、０．６〜２．０質量％、０．７〜２．４質量％、０．７〜２．３質量％、０．７〜２．２質量％、０．７〜２．１質量％、０．７〜２．０質量％、０．８〜２．４質量％、０．８〜２．３質量％、０．８〜２．２質量％、０．８〜２．１質量％、０．８〜２．０質量％、０．９〜２．４質量％、０．９〜２．３質量％、０．９〜２．２質量％、０．９〜２．１質量％、０．９〜２．０質量％、１．０〜２．４質量％、１．０〜２．３質量％、１．０〜２．２質量％、１．０〜２．１質量％、又は１．０〜２．０質量％である。
白色着色剤は、例えば、可視光領域（３８０ｎｍ〜７５０ｎｍ）の全範囲における吸光度が０．３以下である（可視光線を散乱させる）着色剤である。具体的には、白色着色剤は、酸化チタン、酸化チタン−硫酸バリウム、酸化チタン−ケイ酸マグネシウム、酸化チタン−硫酸カルシウム又は酸化亜鉛であってよい。これらの白色着色剤は、１種単独又は２種以上を組み合わせて用いられる。
白色着色剤の含有量は、識別性に更に優れる観点から、好ましくは、フィルム全量基準で、０．１２質量％以上、０．１４質量％以上、０．１６質量％以上、０．１８質量％以上、又は０．２質量％以上である。白色着色剤の含有量は、製膜性及び生産性に更に優れる観点から、好ましくは、フィルム全量基準で、０．６５質量％以下、より好ましくは０．６質量％以下、０．５５質量％以下、又は０．５質量％以下である。白色着色剤の含有量は、識別性、製膜性及び生産性のすべてで更に優れる観点から、好ましくは、フィルム全量基準で、０．１２〜０．６５質量％、０．１２〜０．６質量％、０．１２〜０．５５質量％、０．１２〜０．５質量％、０．１４〜０．６５質量％、０．１４〜０．６質量％、０．１４〜０．５５質量％、０．１４〜０．５質量％、０．１６〜０．６５質量％、０．１６〜０．６質量％、０．１６〜０．５５質量％、０．１６〜０．５質量％、０．１８〜０．６５質量％、０．１８〜０．６質量％、０．１８〜０．５５質量％、０．１８〜０．５質量％、０．２〜０．６５質量％、０．２〜０．６質量％、０．２〜０．５５質量％、又は０．２〜０．５質量％である。
フィルムは、塩化ビニリデン系樹脂、青色着色剤及び白色着色剤に加えて、その他の添加剤を更に含有していてもよい。その他の添加剤としては、可塑剤、防曇剤、熱安定剤、光安定剤、滑剤、充填剤、プレートアウト防止剤、抗酸化剤、離型剤、粘度低下剤、界面活性剤、青色着色剤及び白色着色剤以外の着色剤、蛍光剤、表面処理剤、架橋剤、加工助剤、粘着剤、帯電防止剤、紫外線吸収剤、アンチブロッキング剤等が挙げられる。
フィルムは、塩化ビニリデン系樹脂、青色着色剤及び白色着色剤を含有する層の一層からなっていてもよく、複数の層からなっていてもよい。フィルムが複数の層からなる場合、フィルムは、例えば第１の表面層と中間層と第２の表面層とをこの順に備えていてよい。この場合、例えば、中間層が青色着色剤及び白色着色剤を含有していてよい。フィルムは、例えば、各層間の接着性を向上させるために、酸変性ポリオレフィン樹脂等を含有する接着層を更に備えていてもよく、フィルムの耐熱性を向上させるために、ポリアミド系樹脂を含有する耐熱層を更に備えていてもよい。
フィルムの厚さは、好ましくは５μｍ以上、より好ましくは６μｍ以上であってよく、また、好ましくは１２μｍ以下、より好ましくは１０μｍ以下であってよい。
フィルムの全光線透過率は、食品の視認性に優れる観点から、好ましくは７０％以上、より好ましくは７５％以上である。フィルムの全光線透過率は、食品に対する識別性に更に優れる観点から、好ましくは８５％以下、より好ましくは８１％以下、更に好ましくは８０％以下、特に好ましくは７９％以下である。フィルムの全光線透過率は、ＪＩＳ Ｋ７３６１−１に準拠して測定された全透過光量に基づき、下記式に従って算出される。
全光線透過率（％）＝（全透過光量）／（入射光量）×１００
フィルムは、塩化ビニリデン系樹脂、青色着色剤及び白色着色剤を含有する組成物を、例えば押出成形することにより製造される。具体的には、該組成物を押出機で加熱溶融してダイ（金型）からチューブ（円筒）状に押出加工した後、水槽で冷却し、次いでこのチューブ状の組成物を再加熱してインフレーション方式で延伸することによりフィルムが得られる。フィルムは、作製しつつ巻き取られるが、巻き取られたフィルムは、２０ｍ、５０ｍ等の所望の長さに更に巻き替えられ、化粧箱に詰められることで製品とされる。
このようにして得られたフィルムに対して、熱収縮率、自然収縮率等の軽減、幅収縮の発生の抑制などの目的に応じて、加熱ロール間での縦延伸、各種の熱固定、エージング等の熱処理を行ってもよく、防曇性、帯電防止性、粘着性等を付与、促進させる目的で、コロナ処理、熟成等の処理、印刷、コーティング等の表面処理、表面加工などを行ってもよい。
以下、実施例に基づいて本発明を更に具体的に説明するが、本発明は実施例に限定されるものではない。
以下の塩化ビニリデン系樹脂、青色着色剤、白色着色剤及び各種添加剤を用いて表１，２に示す組成を有する樹脂組成物を調製し、各樹脂組成物をインフレーション製膜装置で押出し、厚み９μｍのフィルムを作製した。
塩化ビニリデン系樹脂ａ１：塩化ビニリデンと塩化ビニルとの共重合体（塩化ビニリデン／塩化ビニル（質量比）＝９０／１０）、重量平均分子量：８００００
青色着色剤ｂ１：銅フタロシアニン（銅フタロシアニンブルー）
白色着色剤ｃ１：酸化チタン
添加剤ｄ１：セバシン酸ジブチル
添加剤ｄ２：アセチルクエン酸トリブチル
添加剤ｄ３：エポキシ化大豆油
添加剤ｄ４：Ｃａ／Ｚｎ系安定剤
得られた各フィルムについて、以下に示すとおり、全光線透過率の測定及び食品に対する識別性の評価を実施した。結果を表１，２に示す。
（全光線透過率の測定）
日本電色工業社製ヘーズメーター（型式：ＮＤＨ５０００）にてＪＩＳ Ｋ７３６１−１に準拠してフィルムの全透過光量を測定し、下記式に従ってフィルムの全光線透過率を算出した。
全光線透過率（％）＝（全透過光量）／（入射光量）×１００
（識別性の評価）
得られたフィルムから３ｍｍ〜１０ｍｍ角の破片を作製し、食品へフィルムを混入させた際に、フィルムの破片を識別できるかを目視で観察した。評価基準は、以下のとおりである。なお、評価がＡ又はＢであれば、識別性に優れているといえる。
Ａ：食品に対してフィルムを識別することが極めて容易である。
Ｂ：食品に対してフィルムを識別することが容易である。
Ｃ：食品に対してフィルムを識別することが困難である。
（製膜性の評価）
インフレーション製膜装置にて、各樹脂組成物を押出してフィルムの成形を行い、得られたフィルムの外観を観察することで製膜性を評価した。評価基準は、以下のとおりである。なお、評価がＡ又はＢであれば、製膜性に優れているといえる。
Ａ：ほぼ均一の厚みのフィルムが得られた。
Ｂ：フィルムの厚みにむらが見られ、長時間の押出でヤケが発生した。
Ｃ：フィルムの厚みむらが激しく、比較的短時間でヤケが発生した。
（生産性の評価）
インフレーション製膜装置にて、各樹脂組成物を押出してフィルムの成形を行う際に生じる生産トラブル（穴開き、フィルム切れ、スリット不具合等）の１日当たりの発生回数をカウントすることで生産性を評価した。評価基準は、以下のとおりである。なお、評価がＡ又はＢであれば、生産性に優れているといえる。
Ａ：生産トラブル回数が０〜２回／日
Ｂ：生産トラブル回数が３〜４回／日
Ｃ：生産トラブル回数が５回／日以上
Figure 2017100800
Figure 2017100800

Claims (3)

  1. 塩化ビニリデン系樹脂と、青色着色剤と、白色着色剤と、を含有する食品包装用フィルム。
  2. 前記青色着色剤の含有量が、フィルム全量基準で０．６〜２．４質量％である、請求項１に記載の食品包装用フィルム。
  3. 前記白色着色剤の含有量が、フィルム全量基準で０．１２〜０．６５質量％である、請求項１又は２に記載の食品包装用フィルム。
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