JP2009096119A - Freshness keeping film and food packaging container - Google Patents
Freshness keeping film and food packaging container Download PDFInfo
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- JP2009096119A JP2009096119A JP2007271524A JP2007271524A JP2009096119A JP 2009096119 A JP2009096119 A JP 2009096119A JP 2007271524 A JP2007271524 A JP 2007271524A JP 2007271524 A JP2007271524 A JP 2007271524A JP 2009096119 A JP2009096119 A JP 2009096119A
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Abstract
Description
本発明は、線状低密度ポリエチレンを積層延伸して得られるフィルムからなる鮮度保持フィルムおよびそれを成形して得られる食品包装容器に関する。 The present invention relates to a freshness-keeping film comprising a film obtained by laminating and stretching linear low density polyethylene and a food packaging container obtained by molding the film.
野菜や肉、鮮魚などの食品分野において、樹脂からなる包装フィルムが盛んに用いられており、フィルム材料としては、ポリオレフィンが多用されている。
包装フィルムには内容物に応じ適度な通気性が求められるため、フィルムの材質を工夫したり微細な穴をあける等の検討がなされている。具体的には、フィルムに０．６ｍｍ2以
下の微細孔を設け、酸素透過量を１００〜３００,０００ｃｃ／ｍ2・ｄａｙ・ａｔｍとした青果物の鮮度保持包装材料が提案されている（特許文献１参照）。
In food fields such as vegetables, meat, and fresh fish, packaging films made of resin are actively used, and polyolefin is frequently used as a film material.
Since the packaging film is required to have a proper air permeability according to the contents, studies have been made such as devising the material of the film or making fine holes. Specifically, a freshness-keeping packaging material for fruits and vegetables having a fine pore of 0.6 mm 2 or less in the film and an oxygen permeation amount of 100 to 300,000 cc / m 2 · day · atm has been proposed (Patent Literature). 1).
しかしながら、フィルムに微細な穴をあける場合、穴あけ工程が必要となり、内容物によって通気性を制御するため孔の大きさや数を変えねばならず、フィルム加工設備が複雑になる傾向があった。
本発明は、穴あけ加工を行わずとも延伸加工によって適度な気体透過性及び良好な機械物性を併せ持つ包装材料を提供することを目的としている。 An object of this invention is to provide the packaging material which has moderate gas permeability and a favorable mechanical physical property by an extending | stretching process, without performing a drilling process.
本発明者らは鋭意検討を行い、下記に示す線状低密度ポリエチレンからなる積層延伸フィルムによって前述した問題を解決できることを見出して、本発明を完成した。
［１］ 密度が９１０ｋｇ／ｍ3以上９４０ｋｇ／ｍ3以下、ＭＦＲが０．１〜１０ｇ／10
分の線状低密度ポリエチレン（ａ）からなる層（Ｉ）と、密度が８８０ｋｇ／ｍ3以上９
１０ｋｇ／ｍ3未満、ＭＦＲが０．１〜１０ｇ／10分の線状低密度ポリエチレン（ｂ）か
らなる層（II）を少なくとも有する、積層延伸フィルムからなる鮮度保持フィルム。
［２］ 前記層（Ｉ）と層（II）の厚み比が５０／５０〜９５／５であることを特徴とす
る［１］記載の鮮度保持フィルム。
［３］ 前記線状低密度ポリエチレン（ａ）からなる層と前記線状低密度ポリエチレン（
ｂ）からなる層を積層後に延伸倍率３〜１０倍に延伸して得られることを特徴とする［１］記載の鮮度保持フィルム。
［４］ ［１］〜［３］のいずれかに記載の鮮度保持フィルムを袋状に成形してなる食品
包装容器。
The present inventors have intensively studied and found that the above-mentioned problems can be solved by a laminated stretched film made of linear low density polyethylene as described below, thereby completing the present invention.
[1] Density is 910 kg / m 3 or more and 940 kg / m 3 or less, MFR is 0.1 to 10 g / 10
A layer (I) comprising a linear low-density polyethylene (a) and a density of 880 kg / m 3 or more and 9
A freshness-keeping film comprising a laminated stretched film having at least a layer (II) comprising a linear low density polyethylene (b) having a MFR of less than 10 kg / m 3 and an MFR of 0.1 to 10 g / 10 min.
[2] The freshness-keeping film according to [1], wherein the thickness ratio of the layer (I) to the layer (II) is 50/50 to 95/5.
[3] A layer comprising the linear low density polyethylene (a) and the linear low density polyethylene (
The freshness-keeping film according to [1], which is obtained by laminating the layer comprising b) after stretching to a stretching ratio of 3 to 10 times.
[4] A food packaging container obtained by forming the freshness-keeping film according to any one of [1] to [3] into a bag shape.
本発明の鮮度保持フィルムは、適度な気体透過性および良好な機械物性を併せ持っており、野菜や魚肉などの食品包装材料として好適に用いることが出来る。 The freshness-keeping film of the present invention has both moderate gas permeability and good mechanical properties, and can be suitably used as a food packaging material for vegetables and fish meat.
本発明の鮮度保持フィルムである積層延伸フィルムは、線状低密度ポリエチレンを積層してなる。なお、以下線状低密度ポリエチレンを「ＬＬＤＰＥ」と略称することがある。
［Ａ］線状低密度ポリエチレン層（Ｉ）
層（Ｉ）に用いるＬＬＤＰＥ（ａ）の密度は９１０ｋｇ／ｍ3以上９４０ｋｇ／ｍ3以下、ＭＦＲは０．１〜１０ｇ／10分の範囲にある。密度は９２０〜９３０ｋｇ／ｍ3、ＭＦＲは１〜５ｇ／10分であるとより好ましい。
The laminated stretched film which is the freshness-keeping film of the present invention is formed by laminating linear low density polyethylene. Hereinafter, the linear low density polyethylene may be abbreviated as “LLDPE”.
[A] Linear low density polyethylene layer (I)
The density of the LLDPE (a) used for the layer (I) is 910 kg / m 3 or more and 940 kg / m 3 or less, and the MFR is in the range of 0.1 to 10 g / 10 min. More preferably, the density is 920 to 930 kg / m 3 and the MFR is 1 to 5 g / 10 min.
本発明において、ＬＬＤＰＥの密度は、測定サンプルを１２０℃で１時間熱処理し、1
時間かけて直線的に室温まで徐冷したのち、密度勾配管で測定される値である。また、ＬＬＤＰＥのＭＦＲ（メルトフローレート）はＡＳＴＭ Ｄ １２３８に準拠して、１９０℃、荷重２．１６ｋｇで測定される値である。
In the present invention, the density of LLDPE is determined by heating the measurement sample at 120 ° C. for 1 hour,
It is a value measured with a density gradient tube after cooling slowly to room temperature linearly over time. Moreover, MFR (melt flow rate) of LLDPE is a value measured at 190 ° C. and a load of 2.16 kg in accordance with ASTM D 1238.
ＬＬＤＰＥ（ａ）はエチレンと、炭素数３〜１０のα−オレフィンを共重合して製造することが出来る。α−オレフィンとしては例えば、プロピレン、１-ブテン、１-ペンテン、３-メチル-１-ブテン、１-ヘキセン、３-メチル-１-ペンテン、４-メチル-１-ペンテン、１-オクテンなどが挙げられ、１-ブテン、１-ヘキセンが好ましく、共重合量は０．１〜１０mol％が好ましく、さらに０．１〜５．１mol％が好ましい。 LLDPE (a) can be produced by copolymerizing ethylene and an α-olefin having 3 to 10 carbon atoms. Examples of α-olefins include propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 3-methyl-1-pentene, 4-methyl-1-pentene, and 1-octene. 1-butene and 1-hexene are preferable, and the copolymerization amount is preferably 0.1 to 10 mol%, more preferably 0.1 to 5.1 mol%.
エチレンとα−オレフィンの共重合には、メタロセン触媒、チーグラー触媒、バナジウム触媒等公知の触媒を用いることが出来る。中でもメタロセン触媒が好ましい。メタロセン触媒を用いたＬＬＤＰＥの製造方法は、特開昭５８−１９３０９号公報、国際公開ＷＯ９１／０４２５７号公報等に記載されている。 For copolymerization of ethylene and α-olefin, a known catalyst such as a metallocene catalyst, a Ziegler catalyst, or a vanadium catalyst can be used. Of these, metallocene catalysts are preferred. A method for producing LLDPE using a metallocene catalyst is described in JP-A-58-19309, International Publication WO91 / 04257, and the like.
［Ｂ］線状低密度ポリエチレン層（II）
層（II）に用いるＬＬＤＰＥ（ｂ）の密度は８８０ｋｇ／ｍ3以上９１０ｋｇ／ｍ3未満、ＭＦＲが０．１〜１０ｇ／10分の範囲にある。密度は８９０〜９０５ｋｇ／ｍ3、ＭＦＲは１〜５ｇ／10分であるとより好ましい。
[B] Linear low density polyethylene layer (II)
The density of LLDPE (b) used for the layer (II) is 880 kg / m 3 or more 910 kg / m less than 3, MFR is in the range of 0.1 to 10 g / 10 min. More preferably, the density is 890 to 905 kg / m 3 and the MFR is 1 to 5 g / 10 min.
ＬＬＤＰＥ（ｂ）はエチレンと、炭素数３〜１０のα−オレフィンを共重合して製造することが出来る。α−オレフィンとしては例えば、プロピレン、１-ブテン、１-ペンテン、３-メチル-１-ブテン、１-ヘキセン、３-メチル-１-ペンテン、４-メチル-１-ペンテン、１-オクテンなどが挙げられ１−ブテン、１−ヘキセンが好ましく、共重合量は４〜１５mol％が好ましく、さらに５〜１１mol％が好ましい。 LLDPE (b) can be produced by copolymerizing ethylene and an α-olefin having 3 to 10 carbon atoms. Examples of α-olefins include propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 3-methyl-1-pentene, 4-methyl-1-pentene, and 1-octene. 1-butene and 1-hexene are preferable, and the copolymerization amount is preferably 4 to 15 mol%, more preferably 5 to 11 mol%.
エチレンとα−オレフィンの共重合には、メタロセン触媒、チーグラー触媒、バナジウム触媒等公知の触媒を用いることが出来る。中でもメタロセン触媒が好ましい。メタロセン触媒を用いたＬＬＤＰＥの製造方法は、特開昭５８−１９３０９号公報、国際公開ＷＯ９１／０４２５７号公報等に記載されている。 For copolymerization of ethylene and α-olefin, a known catalyst such as a metallocene catalyst, a Ziegler catalyst, or a vanadium catalyst can be used. Of these, metallocene catalysts are preferred. A method for producing LLDPE using a metallocene catalyst is described in JP-A-58-19309, International Publication WO91 / 04257, and the like.
［Ｃ］フィルム成形
ＬＬＤＰＥ（ａ）および（ｂ）は、通常ペレットやパウダーの形で供給される材料を用い、それぞれＴダイや丸ダイを用いた押出し成形、インフレーション成形等公知の成形法によりフィルムに加工することが出来る。
フィルム厚み（未延伸）は１００〜１０００μｍの範囲が好ましい。
[C] Film Molding LLDPE (a) and (b) use materials that are usually supplied in the form of pellets and powders, and are formed by known molding methods such as extrusion molding and inflation molding using T dies and round dies, respectively. Can be processed.
The film thickness (unstretched) is preferably in the range of 100 to 1000 μm.
［Ｄ］積層
ＬＬＤＰＥ（ａ）からなる層およびＬＬＤＰＥ（ｂ）からなる層を積層するにあたっては、公知の方法を用いることが可能であり、ＬＬＤＰＥ（ａ）および（ｂ）を共押出しし、一度に積層フィルムを成形する方法、２枚以上のフィルムを接着剤層および必要に応じてアンカーコート層を用いて張り合わせる方法、接着層を用いずに熱圧着により張り合わせる方法等が挙げられる。接着層を用いると材質によっては通気性を損なうことがあるので、ＬＬＤＰＥ（ａ）および（ｂ）を共押出して積層フィルムを成形することが好ましい。
[D] Lamination In laminating the layer made of LLDPE (a) and the layer made of LLDPE (b), a known method can be used. LLDPE (a) and (b) are co-extruded and once And a method of laminating two or more films using an adhesive layer and, if necessary, an anchor coat layer, a method of laminating by thermocompression bonding without using an adhesive layer, and the like. If an adhesive layer is used, air permeability may be impaired depending on the material. Therefore, it is preferable to form a laminated film by coextrusion of LLDPE (a) and (b).
［Ｅ］延伸
積層延伸フィルムは、通常ＬＬＤＰＥ（ａ）からなる層およびＬＬＤＰＥ（ｂ）からなる層を積層および延伸して得られる。ＬＬＤＰＥ（ａ）からなる層およびＬＬＤＰＥ（ｂ）からなる層を別々に延伸後張り合わせても構わないが、工程上積層後延伸して製造することが好ましい。延伸倍率は面積倍率で通常３〜１５倍、好ましくは４〜１０倍の範囲にある。延伸方法は通常フラット法が用いられ、逐次延伸でも同時延伸でも構わない。
[E] Stretching A laminated stretched film is usually obtained by laminating and stretching a layer composed of LLDPE (a) and a layer composed of LLDPE (b). Although the layer made of LLDPE (a) and the layer made of LLDPE (b) may be stretched separately after being stretched, they are preferably produced by stretching after lamination in the process. The draw ratio is usually in the range of 3 to 15 times, preferably 4 to 10 times in terms of area magnification. As the stretching method, a flat method is usually used, and sequential stretching or simultaneous stretching may be used.
［Ｆ］積層延伸フィルム
積層延伸フィルムはＬＬＤＰＥ層（Ｉ）および（II）を含み、必要に応じて別の層をさらに積層してもよい。別の層としてはポリプロピレン樹脂、ポリアミド樹脂、ポリエステル樹脂や本発明の目的を損なわない範囲でその他のポリマーを添加してもよい、その他のポリマーとしてはポリオレフィン系樹脂（ＬＬＤＰＥ（ａ）および（ｂ）を除く）等が挙げられ、剛性や耐熱性を改良するために添加されるポリプロピレン樹脂、衝撃強度を改良するために添加されるポリオレフィン系熱可塑性エラストマーなどが挙げられる。
[F] Laminated stretched film The laminated stretched film includes LLDPE layers (I) and (II), and another layer may be further laminated as necessary. As another layer, polypropylene resin, polyamide resin, polyester resin and other polymers may be added within a range not impairing the object of the present invention. Other polymers include polyolefin resins (LLDPE (a) and (b) And the like, and polypropylene resins added to improve rigidity and heat resistance, and polyolefin-based thermoplastic elastomers added to improve impact strength.
ＬＬＤＰＥ層（Ｉ）、（II）の厚み比は、（Ｉ）／（II）が５０／５０〜９５／５であることが好ましく、６０／４０〜９０／１０であると特に好ましい。厚み比がこの範囲を外れると、得られるフィルムの気体透過性や機械特性が不十分となる場合がある。
延伸積層フィルムの総厚みは１５〜１００μｍの範囲が好ましい。
The thickness ratio of the LLDPE layers (I) and (II) is preferably (I) / (II) of 50/50 to 95/5, particularly preferably 60/40 to 90/10. If the thickness ratio is out of this range, the resulting film may have insufficient gas permeability and mechanical properties.
The total thickness of the stretched laminated film is preferably in the range of 15 to 100 μm.
［Ｇ］包装材料
本発明の積層延伸フィルムを用い、袋状に成形することによって、食品用包装材料を製造することが出来る。
[G] Packaging material A food packaging material can be produced by forming the laminated stretched film of the present invention into a bag shape.
食品を包装する方法としては、三方をシールした袋に内容物を充填し、頭シールする三方袋包装や、ロールにて供給し製袋・充填を同時に行っていくピロー包装等が挙げられる。三方袋を使うと真空包装が可能である。方法としては袋が自動で給袋された後内容物が充填され、チャンバー内に搬送され、真空ポンプ等で脱気しながらヘッドスペース容積比を制御するとともに封入される。ピロー包装は縦型機の場合、フィルムがロールから繰り出され、フォーマーでフィルム両端が合わせられセンターシールされる。次に横シールされると同時に計量された内容物が充填される。頭シールされると同時にカットされ、その後コンベアで搬出される。その他にもトレイ状成形容器に内容物を充填後トップシールすることも可能である。 Examples of the method for packaging food include three-sided bag packaging in which the contents are filled into a three-side sealed bag and the head is sealed, or pillow packaging that is supplied by a roll and simultaneously made and filled. Vacuum packaging is possible using a three-sided bag. As a method, after the bag is automatically fed, the contents are filled, conveyed into the chamber, and the headspace volume ratio is controlled while being deaerated with a vacuum pump or the like and sealed. In the case of a pillow wrapping machine, the film is unwound from a roll, and both ends of the film are aligned by a former and center sealed. Next, it is horizontally sealed and filled with the weighed contents. It is cut at the same time as the head is sealed, and is then carried out by a conveyor. In addition, it is possible to top seal after filling the contents in the tray-shaped molded container.
［Ｈ］内容物
内容物には次のようなものが挙げられる。
＜野菜＞
レタス、キャベツ、白菜、ネギ、ダイコン、タマネギ、ニンジン、ピーマン、ヤマイモ、カボチャ、サツマイモ、レンコン、きのこ類、ミカン、スダチ、柿、梅等
また、包装する野菜の形態は、賽の目切り、櫛切り、せん切り、短冊切り、銀杏切り、斜め切り、小口切り等、様々な形態にカットされていても良い。賽の目切りは、野菜を1
〜２ｃｍに切り、それを横にして同じ厚さで切る、さいころのような形になる切り方である。櫛切りは丸いものの上下（茎つきやヘタと、根や花落ちのほう）を少し切り落として座りを良くし、縦二つに切り、さらに中心から放射状に均等に切るきり方である。せん切りは４〜５ｃｍの長さに切った野菜を繊維に沿ってさらに細く切る方法である。短冊切りは長方形に形を整えてから、七夕の短冊のように厚さ１〜２ｍｍほどの薄さに縦に切る方法である。銀杏切りは輪切りを四分割したもので銀杏の形に似ている切り方である。斜め切りは筒状の野菜を斜めに、小口切りは薄く輪切りにする切り方である。
[H] Contents Contents include the following.
<Vegetable>
Lettuce, cabbage, Chinese cabbage, leek, radish, onion, carrot, green pepper, yam, pumpkin, sweet potato, lotus root, mushrooms, mandarin orange, sudachi, persimmon, plum, etc. It may be cut into various forms such as slitting, strip cutting, ginkgo cutting, diagonal cutting, and small cutting. 1 piece of vegetables
It is a way of cutting into a shape like a dice by cutting it to ˜2 cm and cutting it to the side with the same thickness. Comb cutting is a way to cut the top and bottom of a round object (stems and stickers, roots and flower drop) a little to improve the sitting, cut into two vertically, and cut evenly radially from the center. Slicing is a method in which vegetables cut to a length of 4-5 cm are further cut along the fiber. The strip cutting is a method in which a shape is formed into a rectangle and then vertically cut into a thickness of about 1 to 2 mm like a Tanabata strip. Ginkgo chopping is a ring cut that is similar to the shape of gingko. Diagonal cutting is a way to cut cylindrical vegetables diagonally, and small cuts to make thin round slices.
＜魚肉＞
包装する魚肉の形態は、フィレー、ブロック、サク、切り身、刺身、あるいはミンチや
ペースト状等、様々な形態として包装できる。フィレーは、魚体から頭と内臓を取り除いた後、３枚に卸した状態を指し、皮付きと皮無しがある。魚肉のロインは、フィレー状の魚肉を二分割した状態を指し、ロインをさらに分割した物がブロックである。サクは、刺身どりがし易いようにブロックから板状に切り出した状態である。サクを厚さが１０ｍｍを越える厚さの肉断片にしたものが切り身であり、１０ｍｍ以下の厚さの肉断片にしたものが刺身である。また、ミンチはチョッパーを用いて直径約３〜１０ｍｍの円柱状に押し出された肉の形態を指し、ペーストは、フードカッター等を用いてさらに細かく練られた肉の形態を指す。ミンチあるいはペーストの例として、魚肉のつみれが挙げられる。さらに、ミオグロビンを含有する食品には、上記の生の魚肉を軽く火で炙った加工品、食用油脂で調味した加工品等が含まれてもよい。加工品については、魚肉の表面を軽く焼いた「カツオのたたき」に代表される食品や、酸化防止剤を含有する液に浸漬処理された赤身魚肉、食用油脂等を添加したネギトロ等が挙げられる。
<Fish meat>
The form of the fish meat to be packaged can be packaged in various forms such as fillet, block, sac, fillet, sashimi, mince or paste. Fillet refers to a state where the head and internal organs are removed from the fish body and then the product is unwrapped into three pieces, with or without skin. Fish loin refers to a state in which a fillet-like fish meat is divided into two, and a block obtained by further dividing the loin is a block. The sac is a state of being cut out in a plate shape from the block so that sashimi is easy. Sliced meat pieces with a thickness exceeding 10 mm are slices, and sashimi are meat pieces with a thickness of 10 mm or less. In addition, mince refers to the form of meat extruded into a cylindrical shape with a diameter of about 3 to 10 mm using a chopper, and the paste refers to the form of meat that is further finely kneaded using a food cutter or the like. Examples of minced or paste include fish meat. Furthermore, the food containing myoglobin may include a processed product obtained by lightly cooking the above raw fish meat, a processed product seasoned with edible fats and oils, and the like. Processed products include foods typified by “bonito octopus” that lightly baked the surface of fish meat, red fish meat that has been soaked in a liquid containing an antioxidant, and negitoro with edible oils and fats added. .
［実施例］
以下本発明を実施例により説明するが、本発明はこれら実施例に限定されるものではない。
（ピンホール確認方法）
振動試験後のピンホール発生の有無は、スーパーボールを真空包装している為目視により確認できる。ピンホールが発生していれば真空が破壊され袋内に空気がはいる。ピンホールは袋四隅に発生しやすい為、分かりづらい場合は袋中央部より先端を針状にした空気入れ等で十分空気を注入し、テープ等でシールし密封したあと水中に沈め空気の漏れを確認した。
[Example]
EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.
(Pinhole confirmation method)
The presence or absence of pinholes after the vibration test can be visually confirmed because the super ball is vacuum-packed. If a pinhole is generated, the vacuum is broken and air enters the bag. Since pinholes are likely to occur at the four corners of the bag, if it is difficult to understand, inject air sufficiently from the center of the bag with a needle-like air pump, seal it with tape, seal it, and then submerge it in water to prevent air leakage. confirmed.
以下のようにして積層延伸フィルムを製造した。
〔使用した原料〕
プライムポリマー社製の下記線状低密度ポリエチレンを用いた：
内層：エボリューＳＰ０５１０（プライムポリマー社製L-LDPE、密度９０３ｋｇ／ｍ3、
ＭＦＲ（２．１６ｋｇ、１９０℃）１．２ｇ／10min.）
中間層および外層：エボリューＳＰ３０１０（プライムポリマー社製L-LDPE、密度９２６ｋｇ／ｍ3、ＭＦＲ（２．１６ｋｇ、１９０℃）０．９ｇ／１０min.）
各々下記の添加剤を含有する：
ＡＳ（静電防止）剤ＭＢ：２％
ＡＢ（アンチブロッキング）剤：４％(ＳＰ０５１０のみ)
ＳＬ（スリップ）剤ＭＢ：２％(ＳＰ０５１０のみ)
〔延伸用原反の調整〕
リップ開度３．５ｍｍ、ダイ径２２５ｍｍφの３層インフレーション成形機（アルピネ社製：５０ｍｍφ押出機 ３台）により、ブロー比２．０４、にて下記条件にて延伸前原反フィルムを製膜した。
厚み比：内層／（中間層＋外層）＝３／８
押出し機温度： 内層＝１９０℃、中間層および外層：２００℃、ダイス：２１０℃
引取速度：４ｍ／ｍｉｎ
〔積層延伸フィルムの製造条件〕
上記方法にて得られた幅＝７２０ｍｍ・厚み＝４４０μｍの延伸原反を、加熱ロールと異なる速度で回転しているロールとの間に通してＭＤ（縦）方向に延伸して、延伸倍率８倍で厚み＝５５μｍの積層延伸フィルムを得た。その後、４０℃の恒温室にて、１日エージング処理を実施後、フィルム物性を評価した。
A laminated stretched film was produced as follows.
[Raw materials used]
The following linear low density polyethylene from Prime Polymer was used:
Inner layer: Evolue SP0510 (L-LDPE manufactured by Prime Polymer Co., Ltd., density 903 kg / m 3 ,
MFR (2.16kg, 190 ° C) 1.2g / 10min.)
Intermediate layer and outer layer: Evolue SP3010 (L-LDPE manufactured by Prime Polymer Co., Ltd., density 926 kg / m 3 , MFR (2.16 kg, 190 ° C.) 0.9 g / 10 min.)
Each contains the following additives:
AS (antistatic) agent MB: 2%
AB (anti-blocking) agent: 4% (SP0510 only)
SL (slip) agent MB: 2% (SP0510 only)
[Adjustment of stretch fabric]
An unstretched raw film was formed by a three-layer inflation molding machine (manufactured by Alpine Co., Ltd .: three 50 mmφ extruders) having a lip opening of 3.5 mm and a die diameter of 225 mmφ under a blow ratio of 2.04 under the following conditions.
Thickness ratio: inner layer / (intermediate layer + outer layer) = 3/8
Extruder temperature: inner layer = 190 ° C., intermediate layer and outer layer: 200 ° C., die: 210 ° C.
Take-off speed: 4m / min
[Production conditions for laminated stretched film]
The stretched raw material having a width of 720 mm and a thickness of 440 μm obtained by the above method is stretched in the MD (longitudinal) direction between a heated roll and a roll rotating at a different speed, and a draw ratio of 8 A laminated stretched film having a thickness of 55 μm was obtained. Thereafter, the film physical properties were evaluated after performing an aging treatment in a thermostatic chamber at 40 ° C. for one day.
〔評価１〕
上記のようにして得られた積層延伸フィルムは、２３℃におけるフィルム酸素透過量３
５００ｃｃ／ｍ2・２４ｈｒ・ａｔｍ（日本分光工業株式会社製ガス透過率測定機Ｇａｓ
ｐｅｒｍ−１００型にて測定）であった。この積層延伸フィルムを、２００ｍｍ×３００ｍｍの三方袋にし、スライスレタス１２０ｇを−０．０７ＭＰａで真空包装した。これを２５℃で保存し、経時変化を確認したところ３日後に組織の壊死が確認された。
[Evaluation 1]
The laminated stretched film obtained as described above has a film oxygen transmission rate of 3 at 23 ° C.
500 cc / m 2 · 24 hr · atm (Gas permeability measuring device Gas, manufactured by JASCO Corporation
perm-100 type). This laminated stretched film was made into a 200 mm × 300 mm three-sided bag, and 120 g of slice lettuce was vacuum-packed at −0.07 MPa. This was preserve | saved at 25 degreeC, and when the time-dependent change was confirmed, the necrosis of the structure | tissue was confirmed after 3 days.
〔評価２〕
上記のようにして得られた積層延伸フィルムは、２３℃におけるフィルム破壊質量（テスター産業株式会社製ダートインパクトテスターで衝撃頭直径３８ｍｍ、高さ０．６６ｍから落下時の５０％破壊質量）が３６０ｇであった。この積層延伸フィルムを、３００ｍｍ×４００ｍｍの三方袋にし、スーパーボール１ｋｇを充填、−０．０８ＭＰａで真空包装した。これに１０Ｈｚ、１Ｇ、上下方向１２０分の振動試験を実施したところ、約２０％（５袋／２４袋）のピンホールが発生した。
[Evaluation 2]
The laminated stretched film obtained as described above has a film breaking mass at 23 ° C. (impact head diameter 38 mm, 50% breaking mass when dropped from a height of 0.66 m with a dart impact tester manufactured by Tester Sangyo Co., Ltd.) of 360 g. Met. This laminated stretched film was made into a 300 mm × 400 mm three-sided bag, filled with 1 kg of super balls, and vacuum packaged at −0.08 MPa. When a vibration test was performed on this at 10 Hz, 1 G, and 120 minutes in the vertical direction, pinholes of about 20% (5 bags / 24 bags) were generated.
〔評価３〕
上記のようにして得られた積層延伸フィルムは、２３℃におけるフィルムのＭＤ方向の引張り破壊伸びが約６０％であった。この積層延伸フィルムをピロー包装充填機（大森機械工業株式会社製）を用いて製袋したところ、３０袋／分のスピードで包装できた。
[Evaluation 3]
The laminated stretched film obtained as described above had a tensile breaking elongation in the MD direction of the film at 23 ° C. of about 60%. When this laminated stretched film was made into a bag using a pillow packaging and filling machine (manufactured by Omori Machine Industry Co., Ltd.), it could be packaged at a speed of 30 bags / minute.
〔比較例１〕
以下に示す物性を有する無延伸フィルムを用いて実施例と同様の物性を評価した。
[Comparative Example 1]
The same physical properties as in the examples were evaluated using unstretched films having the physical properties shown below.
〔実施例の評価１に対応する評価〕
上記無延伸フィルムは、２３℃におけるフィルム酸素透過量５０００ｃｃ／ｍ2・２４
ｈｒ・ａｔｍ（日本分光工業株式会社製ガス透過率測定機Ｇａｓｐｅｒｍ−１００型にて測定）であった。この無延伸フィルムを、２００ｍｍ×３００ｍｍの三方袋にし、スライスレタス１２０ｇを−０．０７ＭＰａで真空包装した。これを２５℃で保存し経時変化を確認したところ1日後に切り口がピンク色に変色していた。
[Evaluation corresponding to Example 1]
The unstretched film has a film oxygen transmission rate of 5000 cc / m 2 · 24 at 23 ° C.
hr.atm (measured by Gasperm-100, a gas permeability measuring machine manufactured by JASCO Corporation). This unstretched film was formed into a 200 mm × 300 mm three-sided bag, and 120 g of slice lettuce was vacuum-packed at −0.07 MPa. When this was stored at 25 ° C. and the change with time was confirmed, the cut end turned pink after one day.
〔実施例の評価２に対応する評価〕
上記無延伸フィルムは、２３℃におけるフィルム破壊質量（テスター産業株式会社製ダートインパクトテスターで衝撃頭直径３８ｍｍ、高さ０．６６ｍから落下時の５０％破壊質量）が９０ｇであった。この無延伸フィルムを、２８５ｍｍ×３９５ｍｍの三方袋にし、スーパーボール１ｋｇを充填、−０．０８ＭＰａで真空包装した。これに１０Ｈｚ、１Ｇ、上下方向１２０分の振動試験を実施したところ、７５％（１２袋／１６袋）ピンホールが発生した。
[Evaluation corresponding to Evaluation 2 of Example]
The unstretched film had a film breaking mass at 23 ° C. (50% breaking mass when dropping from an impact head diameter of 38 mm and a height of 0.66 m with a dirt impact tester manufactured by Tester Sangyo Co., Ltd.). This unstretched film was made into a 285 mm × 395 mm three-sided bag, filled with 1 kg of super balls, and vacuum packaged at −0.08 MPa. When a vibration test was performed on this at 10 Hz, 1 G, and 120 minutes in the vertical direction, 75% (12 bags / 16 bags) pinholes were generated.
〔実施例の評価３に対応する評価〕
上記無延伸フィルムは、２３℃におけるフィルムのＭＤ方向の引張り破壊伸びが約１６０％であった。この無延伸フィルムを、ピロー包装充填機に掛けたところ、フィルムが伸びる等の不具合が発生してしまい、うまく掛からなかった。
[Evaluation corresponding to Example 3]
The unstretched film had a tensile breaking elongation in the MD direction of the film at 23 ° C. of about 160%. When this unstretched film was applied to a pillow packaging and filling machine, problems such as the film being stretched occurred and the film was not applied well.
以上のように、実施例に係る鮮度保持フィルムから得られる食品包装容器では、野菜の鮮度を保持するのに適切なガス透過量を有し、さらに輸送時の耐ピンホール強度や、ピロー包装充填機による包装もスムーズに行える強度を有することが明らかとなった。 As described above, the food packaging container obtained from the freshness-keeping film according to the example has an appropriate gas permeation amount to maintain the freshness of vegetables, and further has resistance to pinholes during transportation and filling with pillow packaging It became clear that the machine was strong enough to be packaged smoothly.
本発明の鮮度保持フィルムから得られる食品包装容器は、野菜やそれらの加工品を包装する包装袋として好適に使用できる。 The food packaging container obtained from the freshness-keeping film of the present invention can be suitably used as a packaging bag for packaging vegetables and their processed products.
Claims (4)
ｇ／ｍ3未満、ＭＦＲが０．１〜１０ｇ／10分の線状低密度ポリエチレン（ｂ）からなる
層（II）を少なくとも有する、積層延伸フィルムからなる鮮度保持フィルム。 A layer (I) made of linear low density polyethylene (a) having a density of 910 kg / m 3 or more and 940 kg / m 3 or less and an MFR of 0.1 to 10 g / 10 min, and a density of 880 kg / m 3 or more and 910 k.
A freshness-keeping film made of a laminated stretched film having at least a layer (II) made of linear low density polyethylene (b) having an MFR of less than g / m 3 and an MFR of 0.1 to 10 g / 10 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| JP2007271524A JP2009096119A (en) | 2007-10-18 | 2007-10-18 | Freshness keeping film and food packaging container |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007271524A JP2009096119A (en) | 2007-10-18 | 2007-10-18 | Freshness keeping film and food packaging container |
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| Publication Number | Publication Date |
|---|---|
| JP2009096119A true JP2009096119A (en) | 2009-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021200991A1 (en) * | 2020-03-31 | 2021-10-07 | 株式会社プライムポリマー | Ethylene resin composition and film |
| CN115973602A (en) * | 2022-12-20 | 2023-04-18 | 安徽靖童科技农业发展有限公司 | Food preservative film and preparation method thereof |
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|---|---|---|---|---|
| JPH01304938A (en) * | 1988-06-03 | 1989-12-08 | Kohjin Co Ltd | Heat-shrinkable multilayer film |
| JPH03136837A (en) * | 1989-10-23 | 1991-06-11 | Nitto Denko Corp | Freshness keeping sheet |
| JPH0466048A (en) * | 1990-07-04 | 1992-03-02 | Dainippon Printing Co Ltd | Method for keeping freshness of vegetable and fruit |
| JP2001162737A (en) * | 1999-12-07 | 2001-06-19 | Ube Ind Ltd | Multi-layer film for packaging |
| JP2006181831A (en) * | 2004-12-27 | 2006-07-13 | Prime Polymer:Kk | Biaxially oriented multi-layer polyethylene film |
-
2007
- 2007-10-18 JP JP2007271524A patent/JP2009096119A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01304938A (en) * | 1988-06-03 | 1989-12-08 | Kohjin Co Ltd | Heat-shrinkable multilayer film |
| JPH03136837A (en) * | 1989-10-23 | 1991-06-11 | Nitto Denko Corp | Freshness keeping sheet |
| JPH0466048A (en) * | 1990-07-04 | 1992-03-02 | Dainippon Printing Co Ltd | Method for keeping freshness of vegetable and fruit |
| JP2001162737A (en) * | 1999-12-07 | 2001-06-19 | Ube Ind Ltd | Multi-layer film for packaging |
| JP2006181831A (en) * | 2004-12-27 | 2006-07-13 | Prime Polymer:Kk | Biaxially oriented multi-layer polyethylene film |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021200991A1 (en) * | 2020-03-31 | 2021-10-07 | 株式会社プライムポリマー | Ethylene resin composition and film |
| JPWO2021200991A1 (en) * | 2020-03-31 | 2021-10-07 | ||
| CN115380070A (en) * | 2020-03-31 | 2022-11-22 | 普瑞曼聚合物株式会社 | Ethylene resin composition and film |
| CN115973602A (en) * | 2022-12-20 | 2023-04-18 | 安徽靖童科技农业发展有限公司 | Food preservative film and preparation method thereof |
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