JP2008238510A - Coextruded film and film for packaging - Google Patents

Coextruded film and film for packaging Download PDF

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JP2008238510A
JP2008238510A JP2007080614A JP2007080614A JP2008238510A JP 2008238510 A JP2008238510 A JP 2008238510A JP 2007080614 A JP2007080614 A JP 2007080614A JP 2007080614 A JP2007080614 A JP 2007080614A JP 2008238510 A JP2008238510 A JP 2008238510A
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layer
film
surface layer
weight
packaging
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Tomoko Kitamura
知子 北村
Koji Takada
康治 高田
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Fujimori Kogyo Co Ltd
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Fujimori Kogyo Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a film having low moisture permeability capable of ensuring rigidity even if the thickness is made thin. <P>SOLUTION: The sealant layer of the film for packaging is formed by using a coextruded film which is composed of three layers of an intermediate layer composed of a linear low-density polyethylene (C<SB>6</SB>LLDPE) where an ethylene and alpha olefin having six carbons are co-polymerized or a high-density polyethylene (HDPE), a front surface layer, and a back surface layer, which are laminated on both sides of the intermediate layer, and composed of a linear low-density polyethylene (C<SB>4</SB>LLDPE) layer where the ethylene and the alpha olefin having four carbons are co-polymerized, and the thickness ratio of the three layers of the front surface layer, the intermediate layer, and the back surface layer is within the range of 1:1:1 to 1:2:1 when the thickness of the front surface layer and the back surface layer is 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、共押出フィルム及び包装用フィルムに関し、特に、自立袋を形成するための包装用フィルムおよびそのシーラント層として好適な共押出フィルムに関する。   The present invention relates to a coextruded film and a packaging film, and more particularly to a packaging film for forming a self-supporting bag and a coextruded film suitable as a sealant layer thereof.

特許文献1には、膜厚の増加に依存することなしに自立袋の剛性、バリア性、強度を向上することを目的とした、熱接着層・高密度層・熱接着層の3層を、接着剤を介さないで共押出で積層した熱接着性フィルムが記載されており、熱接着層としては直鎖状低密度ポリエチレン(LLDPE)または低密度ポリエチレン(LDPE)が、高密度層としては高密度ポリエチレン(HDPE)が例示されている。しかしながら、軽量化や嵩の減容、生産性を向上させるための低温ヒートシール性の向上、などについての考慮はされていないものであった。
特許文献2には、接着剤層を介して基材層と積層されたポリエチレン層が、接着剤層側よりCのLLDPE層、白色着色剤を含む中密度又は高密度ポリエチレン層、CのLLDPE層の3つの層が順次積層された層からなることを特徴とする、遮光性、易カット性を有する包装材料が記載されている。しかしながら、遮光性を得るための白色顔料を中間層の1層のみに配合していることで、更に遮光性を上げるために白色顔料の配合量を増やそうとした場合には加工性や生産性の低下が懸念されるものであった。
特開2002−120849号公報 特開2005−162217号公報
Patent Document 1 includes three layers of a thermal adhesive layer, a high-density layer, and a thermal adhesive layer for the purpose of improving the rigidity, barrier properties, and strength of a self-supporting bag without depending on an increase in film thickness. A heat-adhesive film laminated by coextrusion without using an adhesive is described, and linear low-density polyethylene (LLDPE) or low-density polyethylene (LDPE) is used as the heat-adhesive layer, and high-density layer is used as the high-density layer. A density polyethylene (HDPE) is illustrated. However, no consideration has been given to weight reduction, volume reduction, and improvement of low-temperature heat sealability for improving productivity.
In Patent Document 2, a polyethylene layer laminated with a base material layer via an adhesive layer is a C 6 LLDPE layer, a medium density or high density polyethylene layer containing a white colorant from the adhesive layer side, a C 4 A packaging material having light-shielding properties and easy-cutting properties, characterized in that it comprises a layer in which three layers of an LLDPE layer are sequentially laminated, is described. However, the white pigment for obtaining the light shielding property is blended in only one layer of the intermediate layer, so that the processability and productivity are increased when the amount of the white pigment is increased in order to further improve the light shielding property. The decline was a concern.
Japanese Patent Laid-Open No. 2002-120849 JP 2005-162217 A

スタンディングパウチ(自立袋ともいう。)においては、自立させるための剛性(自立性)を確保するとともに、厚さを小さくして軽量化や廃棄時の折り畳み性及び、低温ヒートシール性を良くし生産性を向上させ、なおかつ内容物の品質を維持するために透湿性(水蒸気に対するガスバリア性)が低いことや、遮光性に優れることが要求されている。   Standing pouches (also referred to as self-supporting bags) are manufactured to ensure rigidity (self-supporting) for self-supporting and to reduce the thickness to reduce weight, foldability at disposal, and low-temperature heat sealability. In order to improve the property and maintain the quality of the contents, it is required that the moisture permeability (gas barrier property against water vapor) is low and the light shielding property is excellent.

本発明は、上記事情に鑑みてなされたものであり、必要な剛性や、透湿性を維持したまま、厚さを薄くすることで、低温ヒートシール性を向上させ、白色印刷と同等以上の遮光性を得るための白色顔料を配合することによる加工性や生産性の低下を起こさないフィルムを提供することを課題とする。   The present invention has been made in view of the above circumstances, and by reducing the thickness while maintaining the necessary rigidity and moisture permeability, the low-temperature heat-sealing property is improved, and light shielding equivalent to or better than that of white printing is achieved. It is an object of the present invention to provide a film that does not cause deterioration in processability and productivity due to the blending of a white pigment for obtaining properties.

前記課題を解決するため、本発明は、エチレンと炭素数が6個のαオレフィンを共重合させた直鎖状低密度ポリエチレン(CLLDPE)または高密度ポリエチレン(HDPE)からなる中間層と、この中間層の両面に積層されたエチレンと炭素数が4個のαオレフィンを共重合させた直鎖状低密度ポリエチレン(CLLDPE)層からなる表面層及び裏面層の3つの層からなり、表面層及び裏面層の厚さを1としたときの表面層、中間層、裏面層の3層の厚さの比が1:1:1〜1:2:1の範囲内であることを特徴とする共押出フィルムを提供する。
前記表面層及び中間層が白色顔料を含有することが好ましい。
また、本発明は、上記の共押出フィルムの表面層側に基材フィルムがラミネートされてなり、前記共押出フィルムの裏面層がシーラント層であることを特徴とする包装用フィルムを提供する。
In order to solve the above problems, the present invention includes an intermediate layer made of linear low density polyethylene (C 6 LLDPE) or high density polyethylene (HDPE) obtained by copolymerizing ethylene and an α-olefin having 6 carbon atoms, It consists of three layers, a front surface layer and a back surface layer composed of a linear low density polyethylene (C 4 LLDPE) layer obtained by copolymerizing ethylene and α-olefin having 4 carbon atoms laminated on both surfaces of this intermediate layer, The thickness ratio of the surface layer, the intermediate layer, and the back layer when the thickness of the surface layer and the back layer is 1, is in the range of 1: 1: 1 to 1: 2: 1. A coextruded film is provided.
The surface layer and the intermediate layer preferably contain a white pigment.
The present invention also provides a packaging film, wherein a base film is laminated on the surface layer side of the coextruded film, and the back layer of the coextruded film is a sealant layer.

本発明の共押出フィルムによれば、厚さを薄くしても剛性を確保できるとともに、透湿性が低く、遮光性や低温ヒートシール性が良好な共押出フィルム及び包装用フィルムを提供することができる。   According to the coextruded film of the present invention, it is possible to provide a coextruded film and a packaging film that can ensure rigidity even when the thickness is reduced, have low moisture permeability, and have good light shielding properties and low-temperature heat sealability. it can.

以下、最良の形態に基づいて本発明を説明する。
本発明の共押出フィルムは、共押出によって表面層、中間層、裏面層の3層が順に積層された構成を有する多層樹脂フィルムであって、中間層はCLLDPEまたはHDPEからなり、表面層及び裏面層はCLLDPE層からなり、表面層、中間層、裏面層の3層の厚さの比が1:1:1〜1:2:1の範囲内である(すなわち、表面層及び裏面層の厚さを1としたときの中間層の厚さが1〜2の範囲内である)ことを特徴とする。
共押出方法は特に限定されるものではないが、多層インフレーションや多層Tダイなどが好適に用いられる。
このような構成の共押出フィルムは、同程度の剛性を持つCLLDPE単層フィルムに比べて厚さを薄くすることができる。
The present invention will be described below based on the best mode.
The coextruded film of the present invention is a multilayer resin film having a structure in which three layers of a surface layer, an intermediate layer, and a back layer are sequentially laminated by coextrusion, and the intermediate layer is made of C 6 LLDPE or HDPE. And the back layer is composed of a C 4 LLDPE layer, and the ratio of the thicknesses of the surface layer, the intermediate layer, and the back layer is within a range of 1: 1: 1 to 1: 2: 1 (that is, the surface layer and the back layer) The thickness of the intermediate layer is within the range of 1 to 2 when the thickness of the back layer is 1.
The co-extrusion method is not particularly limited, but multilayer inflation, multilayer T-die, etc. are preferably used.
The coextruded film having such a configuration can be made thinner than a C 4 LLDPE single layer film having the same degree of rigidity.

内容物保護の観点から共押出フィルム自体に遮光性を付与するため、表面層及び中間層には、白色顔料を含有させることができる。白色顔料としては、チタンホワイトなどの酸化チタン系白色顔料が遮光性に優れるため好ましい。当該樹脂層に白色顔料を分散させるには、白色顔料を少量のベース樹脂に均一に混練した白色マスターバッチを用意し、かかる白色マスターバッチを各樹脂層形成用の樹脂と混合して共押出する方法が挙げられる。
袋に表示や装飾などの目的で印刷を行う場合、印刷の映えを良くするために下地として白色印刷を設ける場合が多いが、表面層及び中間層が白色顔料を含有する場合、白色印刷層を別途設ける場合に比べて印刷工程を削減でき、また厚さの増加を避けることもできる。
また、3層のうち、袋の内部となる最内層には白色顔料を含ませないことで、ヒートシール性や衛生性に悪影響を及ぼすことがない。また、袋の外側からの2層各々に白色顔料を含有させることで、どちらか1層のみに同程度の遮光性を持たせる量の白色顔料を含有させた場合に比べ、各層の加工性や生産性などに与える影響を分散することができる。
In order to impart light shielding properties to the coextruded film itself from the viewpoint of content protection, the surface layer and the intermediate layer may contain a white pigment. As the white pigment, a titanium oxide-based white pigment such as titanium white is preferable because of its excellent light shielding properties. In order to disperse the white pigment in the resin layer, a white master batch in which the white pigment is uniformly kneaded with a small amount of base resin is prepared, and the white master batch is mixed with the resin for forming each resin layer and coextruded. A method is mentioned.
When printing on a bag for the purpose of display or decoration, white printing is often provided as a base to improve the print quality, but when the surface layer and intermediate layer contain a white pigment, The printing process can be reduced compared with the case where it is provided separately, and an increase in thickness can be avoided.
In addition, among the three layers, the innermost layer that is the inside of the bag does not include a white pigment, so that the heat sealability and hygiene are not adversely affected. In addition, by including a white pigment in each of the two layers from the outside of the bag, the processability of each layer can be compared with the case where only one of the layers contains a white pigment in an amount that provides the same degree of light shielding properties. The influence on productivity etc. can be distributed.

また、表面層、中間層、裏面層の各樹脂層には、アンチブロッキング剤、スリップ剤、酸化防止剤などの添加剤を適宜添加しても良い。   In addition, additives such as an antiblocking agent, a slip agent, and an antioxidant may be appropriately added to each resin layer of the front surface layer, the intermediate layer, and the back surface layer.

基材フィルムとラミネートして包装用フィルムを製造する際には、表面層をコロナ処理等によって表面処理し、接着剤層に対する密着性を高めることが好適である。裏面層は、熱融着のためのシーラント層として用いることができる。
基材フィルムとしては、ナイロンフィルムやポリエステルフィルムなどの単層フィルムや、これらを組み合わせた多層フィルムなどが用途に合わせて選択可能である。
共押出フィルムと基材フィルムの積層には、共押出フィルムと基材フィルムの間に樹脂を押し出して積層するフィルムサンド法や、接着剤を用いて接着するドライラミネート法などの公知の手段が適宜用いられる。ドライラミネート法の接着剤としては、ポリウレタン系、ポリエーテル系等、一般的に使用される接着剤を使用でき、包装用フィルムの用途に合わせて選択可能である。
When a packaging film is produced by laminating with a base film, it is preferable that the surface layer is surface-treated by corona treatment or the like to improve the adhesion to the adhesive layer. The back layer can be used as a sealant layer for heat sealing.
As the base film, a monolayer film such as a nylon film or a polyester film, a multilayer film combining these films, or the like can be selected in accordance with the application.
For the lamination of the co-extruded film and the base film, known means such as a film sand method in which a resin is extruded and laminated between the co-extruded film and the base film, and a dry laminating method in which an adhesive is used for bonding are appropriately used. Used. As the adhesive for the dry laminating method, commonly used adhesives such as polyurethane and polyether can be used and can be selected according to the use of the packaging film.

本発明の包装用フィルムは、共押出フィルム層をシーラント層としてヒートシールすることができ、種々の包装袋の製造に用いることができる。包装袋の形態は、自立袋(スタンディングパウチ)の他、三方袋、四方袋、合掌貼り袋、ガゼット袋等の比較的小型の軟包装袋(パウチ)、あるいはバッグインボックス用の内袋やドラム缶内装袋などの大型の袋等、特に限定なく適用可能である。本発明の包装用フィルムを用いて製造した包装袋は、医薬品、化粧品、洗剤や柔軟剤などの日用品、飲食物の包装袋として好適に利用することができる。   The packaging film of the present invention can be heat-sealed with the coextruded film layer as a sealant layer, and can be used for the production of various packaging bags. The form of the packaging bag is a self-standing bag (standing pouch), a relatively small soft packaging bag (pouch) such as a three-sided bag, a four-sided bag, a jointed bag, a gusset bag, or an inner bag or drum for a bag-in-box Large bags such as interior bags can be used without particular limitation. The packaging bag manufactured using the packaging film of the present invention can be preferably used as a packaging bag for daily necessities such as pharmaceuticals, cosmetics, detergents and softeners, and food and drink.

(共押出フィルムの製造に用いた樹脂)
LLDPEとしては、密度0.923g/cm、190℃におけるMFR1.2のものを用いた。
LLDPEとしては、密度0.937g/cm、190℃におけるMFR1.8のものを用いた。
HDPEとしては、密度0.950g/cm、190℃におけるMFR1.1のものを用いた。
白色マスターバッチとしては、LDPEベースおよびHDPEベースともに顔料濃度60%のものを用いた。
(Resin used to manufacture coextruded film)
As C 4 LLDPE, one having a density of 0.923 g / cm 3 and an MFR of 1.2 at 190 ° C. was used.
As C 6 LLDPE, one having a density of 0.937 g / cm 3 and MFR 1.8 at 190 ° C. was used.
As HDPE, one having a density of 0.950 g / cm 3 and MFR 1.1 at 190 ° C. was used.
As the white masterbatch, those having a pigment concentration of 60% were used for both the LDPE base and the HDPE base.

(実施例1−1の共押出フィルムの製造)
LLDPE100質量部に対して、LDPEベースのチタンホワイトのマスターバッチを10質量部、アンチブロッキング剤を2質量部、添加したものを表面層用樹脂とし、HDPE100質量部に対して、HDPEベースのチタンホワイトのマスターバッチを10質量部、スリップ剤を3質量部、添加したものを中間層用樹脂とし、CLLDPE100質量部に対して、アンチブロッキング剤2質量部、スリップ剤を1質量部、添加したものを裏面層用樹脂として用い、厚さの比が、表面層:中間層:裏面層=1:1:1、総厚みが100μmとなるように調整して、Tダイから3層共押出により実施例1−1の共押出フィルムを製造した。
(Production of coextruded film of Example 1-1)
10 parts by mass of an LDPE-based titanium white masterbatch and 2 parts by mass of an antiblocking agent are added to 100 parts by mass of C 4 LLDPE, and a resin for the surface layer is added. 10 parts by weight of a master batch of titanium white, 3 parts by weight of a slip agent, and what was added as a resin for the intermediate layer, with respect to 100 parts by weight of C 4 LLDPE, 2 parts by weight of antiblocking agent, 1 part by weight of slip agent, The added one is used as a resin for the back layer, and the thickness ratio is adjusted so that the surface layer: intermediate layer: back layer = 1: 1: 1 and the total thickness is 100 μm. The coextruded film of Example 1-1 was produced by extrusion.

(実施例1−2の共押出フィルムの製造)
LLDPE100質量部に対して、LDPEベースのチタンホワイトのマスターバッチを10質量部、アンチブロッキング剤を2質量部、添加したものを表面層用樹脂とし、CLLDPE100質量部に対して、HDPEベースのチタンホワイトのマスターバッチを10質量部、スリップ剤を3質量部、添加したものを中間層用樹脂とし、CLLDPE100質量部に対して、アンチブロッキング剤2質量部、スリップ剤を1質量部、添加したものを裏面層用樹脂として用い、厚さの比が、表面層:中間層:裏面層=1:1:1、総厚みが100μmとなるように調整して、Tダイから3層共押出により実施例1−2の共押出フィルムを製造した。
(Production of coextruded film of Example 1-2)
Against C 4 LLDPE100 parts by weight 10 parts by weight of a masterbatch of LDPE based titanium white, 2 parts by weight of antiblocking agent, a material obtained by adding a surface layer resin, with respect to C 6 LLDPE100 parts by weight HDPE 10 parts by weight of the master titanium white base batch, 3 parts by weight of slip agent, and the added resin as an intermediate layer resin, 2 parts by weight of antiblocking agent and 1 part by weight of slip agent for 100 parts by weight of C 4 LLDPE 3 parts from the T-die by adjusting the thickness ratio to be the surface layer: intermediate layer: back surface layer = 1: 1: 1 and the total thickness of 100 μm. A coextruded film of Example 1-2 was produced by layer coextrusion.

(実施例1−3の共押出フィルムの製造)
LLDPE100質量部に対して、LDPEベースのチタンホワイトのマスターバッチを10質量部、アンチブロッキング剤を2質量部、添加したものを表面層用樹脂とし、CLLDPE100質量部に対して、HDPEベースのチタンホワイトのマスターバッチを10質量部、スリップ剤を3質量部、添加したものを中間層用樹脂とし、CLLDPE100質量部に対して、アンチブロッキング剤2質量部、スリップ剤を1質量部、添加したものを裏面層用樹脂として用い、厚さの比が、表面層:中間層:裏面層=1:2:1、総厚みが100μmとなるように調整して、Tダイから3層共押出により実施例1−3の共押出フィルムを製造した。
(Production of coextruded film of Example 1-3)
Against C 4 LLDPE100 parts by weight 10 parts by weight of a masterbatch of LDPE based titanium white, 2 parts by weight of antiblocking agent, a material obtained by adding a surface layer resin, with respect to C 6 LLDPE100 parts by weight HDPE 10 parts by weight of the master titanium white base batch, 3 parts by weight of slip agent, and the added resin as an intermediate layer resin, 2 parts by weight of antiblocking agent and 1 part by weight of slip agent for 100 parts by weight of C 4 LLDPE Part and added are used as the resin for the back layer, and the ratio of thickness is adjusted so that the surface layer: intermediate layer: back surface layer = 1: 2: 1, and the total thickness is 100 μm. The coextruded film of Example 1-3 was produced by layer coextrusion.

(比較例1−1の共押出フィルムの製造)
LLDPE100質量部に対して、LDPEベースのチタンホワイトのマスターバッチを10質量部、アンチブロッキング剤を2質量部、添加したものを表面層用樹脂とし、CLLDPE100質量部に対して、LDPEベースのチタンホワイトのマスターバッチを10質量部、スリップ剤を3質量部、添加したものを中間層用樹脂とし、CLLDPE100質量部に対して、アンチブロッキング剤2質量部、スリップ剤を1質量部、添加したものを裏面層用樹脂として用い、厚さの比が、表面層:中間層:裏面層=1:1:1、総厚みが100μmとなるように調整して、Tダイから3層共押出により比較例1−1の共押出フィルムを製造した。
(Production of coextruded film of Comparative Example 1-1)
Against C 4 LLDPE100 parts by weight 10 parts by weight of a masterbatch of LDPE based titanium white, 2 parts by weight of antiblocking agent, a material obtained by adding a surface layer resin, with respect to C 4 LLDPE100 parts by weight LDPE 10 parts by weight of the master titanium white base batch, 3 parts by weight of slip agent, and the added resin as an intermediate layer resin, 2 parts by weight of antiblocking agent and 1 part by weight of slip agent for 100 parts by weight of C 4 LLDPE 3 parts from the T-die by adjusting the thickness ratio to be the surface layer: intermediate layer: back surface layer = 1: 1: 1 and the total thickness of 100 μm. A coextruded film of Comparative Example 1-1 was produced by layer coextrusion.

(共押出フィルムの試験)
各実施例および比較例の共押出フィルムについて、リングクラッシュ法による圧縮強さ[N]および透湿度[g/(m・d)]を測定した。その結果を表1に示す。
リングクラッシュ法による圧縮強さは、JIS P 8126に準拠し、フィルムを試験片として測定した。このとき、試験片にかかる圧縮荷重の方向がフィルムのMD方向である場合をMD方向の圧縮強さとし、同様に圧縮荷重の方向がフィルムのTD方向である場合をTD方向の圧縮強さとした。
透湿度は、JIS K 7129 B法に準拠して測定した。
(Co-extruded film test)
For the coextruded films of each Example and Comparative Example, the compression strength [N] and moisture permeability [g / (m 2 · d)] by the ring crush method were measured. The results are shown in Table 1.
The compressive strength by the ring crush method was measured using a film as a test piece in accordance with JIS P 8126. At this time, the case where the direction of the compressive load applied to the test piece was the MD direction of the film was taken as the MD compressive strength, and the case where the direction of the compressive load was the TD direction of the film was taken as the compressive strength in the TD direction.
The moisture permeability was measured according to JIS K 7129 B method.

Figure 2008238510
Figure 2008238510

以上の結果によれば、実施例の共押出フィルムは、比較例の共押出フィルムと同じ厚さでありながら、剛性および透湿度が優れている。   According to the above results, the coextruded film of the example is excellent in rigidity and moisture permeability while being the same thickness as the coextruded film of the comparative example.

(包装用フィルムの製造)
表2に示す構成により、実施例および比較例に係る包装用フィルムを製造した。表2において、層間を「//」と示した箇所は、接着剤層を介したドライラミネートであることを示す。
実施例2−1、2−2、2−3に係る包装用フィルムは、それぞれ上記の実施例1−1、1−2、1−3の共押出フィルムの表面層側に、厚さ25μmの延伸ナイロン(O−NY)フィルムをドライラミネートにより積層することで製造した。
比較例2−1の包装用フィルムは、白色印刷を施した厚さ25μmの延伸ナイロン(O−NY)フィルムと、厚さ130μmの未着色のLLDPEフィルムとをドライラミネートにより積層することで製造した。
(Manufacture of packaging film)
With the configuration shown in Table 2, packaging films according to Examples and Comparative Examples were produced. In Table 2, the portion indicated by “//” between the layers indicates dry lamination via an adhesive layer.
The packaging films according to Examples 2-1, 2-2, and 2-3 have a thickness of 25 μm on the surface layer side of the coextruded films of Examples 1-1, 1-2, and 1-3, respectively. It was manufactured by laminating stretched nylon (O-NY) film by dry lamination.
The packaging film of Comparative Example 2-1 was manufactured by laminating a stretched nylon (O-NY) film having a thickness of 25 μm subjected to white printing and an uncolored LLDPE film having a thickness of 130 μm by dry lamination. .

Figure 2008238510
Figure 2008238510

(包装用フィルムの試験)
各実施例および比較例の包装用フィルムについて、重量(坪量)[g/m]、引裂強度[N](JIS K 7128−2 エルメンドルフ引裂法)、突刺強度[N](JIS Z 1707)、リングクラッシュ法による圧縮強さ[N]および比圧縮強さ[N・m/g]、ならびに透湿度[g/(m・d)]を測定した。その結果を表3に示す。また、圧力0.2MPa、時間1秒、温度120℃から180℃の範囲の条件におけるヒートシール強度[N/15mm](JIS Z 0238)の測定結果を表4に示す。また、各実施例および比較例の包装用フィルムの白色部の紫外可視領域における光線透過率を図1に示す。
リングクラッシュ法による圧縮強さおよび比圧縮強さは、JIS P 8126に準拠し、フィルムを試験片として測定した。このとき、試験片にかかる圧縮荷重の方向がフィルムのMD方向である場合をMD方向の圧縮強さとし、同様に圧縮荷重の方向がフィルムのTD方向である場合をTD方向の圧縮強さとした。さらに、測定した圧縮強さと、フィルムの重量とから比圧縮強さ(JIS P 8126)を計算して求めた。
透湿度は、JIS K 7129 B法に準拠して測定した。
(Test of packaging film)
About the packaging film of each Example and Comparative Example, weight (basis weight) [g / m 2 ], tear strength [N] (JIS K 7128-2 Elmendorf tear method), puncture strength [N] (JIS Z 1707) The compression strength [N] and specific compression strength [N · m 2 / g] and moisture permeability [g / (m 2 · d)] measured by the ring crush method were measured. The results are shown in Table 3. Table 4 shows the measurement results of heat seal strength [N / 15 mm] (JIS Z 0238) under the conditions of pressure 0.2 MPa, time 1 second, and temperature in the range of 120 ° C. to 180 ° C. Moreover, the light transmittance in the ultraviolet visible region of the white part of the film for packaging of each Example and a comparative example is shown in FIG.
The compressive strength and specific compressive strength according to the ring crush method were measured in accordance with JIS P 8126 using the film as a test piece. At this time, the case where the direction of the compressive load applied to the test piece was the MD direction of the film was taken as the MD compressive strength, and the case where the direction of the compressive load was the TD direction of the film was taken as the compressive strength in the TD direction. Further, the specific compressive strength (JIS P 8126) was calculated from the measured compressive strength and the weight of the film.
The moisture permeability was measured according to JIS K 7129 B method.

Figure 2008238510
Figure 2008238510

Figure 2008238510
Figure 2008238510

以上の結果によれば、実施例の包装用フィルムは、比較例の包装用フィルムよりも厚さが約30μm薄いにもかかわらず、これらに匹敵する剛性および透湿性を備えている。また、ヒートシール強度については比較例の包装用フィルムがシール温度150〜160℃の条件で実用的なヒートシール強度域に達しているのに対し、実施例の包装用フィルムはシール温度140℃の条件から実用的なヒートシール強度域に達していることがわかる。   According to the above result, although the packaging film of an Example is about 30 micrometers thinner than the packaging film of a comparative example, it has rigidity and moisture permeability comparable to these. Moreover, as for the heat seal strength, the packaging film of the comparative example has reached a practical heat seal strength range under the condition of a seal temperature of 150 to 160 ° C., whereas the packaging film of the example has a seal temperature of 140 ° C. It can be seen from the conditions that a practical heat seal strength range has been reached.

高温域(160℃以上)において比較例のヒートシール強度が各実施例を上回るのは、ヒートシール強度に影響のあるCLLDPE層の厚みの違いによるものと考えられる。しかしながら、JIS Z 0238においてヒートシール強度の目安が、重量物包装用袋において35N/15mm以上とされていることから、本実施例のヒートシール強度は必要十分であることが分かる。これにより、本発明の共押出フィルムをシーラント層として用いた包装用フィルムは、厚さを薄くしても剛性を確保し、透湿性が低く、ヒートシール性に優れたものとなることが分かる。 The reason why the heat seal strength of the comparative example exceeds each example in the high temperature range (160 ° C. or higher) is considered to be due to the difference in the thickness of the C 4 LLDPE layer that affects the heat seal strength. However, since the standard of heat seal strength in JIS Z 0238 is set to 35 N / 15 mm or more in heavy-duty packaging bags, it can be seen that the heat seal strength of this example is necessary and sufficient. Thus, it can be seen that the packaging film using the coextruded film of the present invention as a sealant layer ensures rigidity even when the thickness is reduced, has low moisture permeability, and is excellent in heat sealability.

本発明の共押出フィルムは、包装用フィルムのシーラント層として好適に利用することができる。   The coextruded film of the present invention can be suitably used as a sealant layer for packaging films.

実施例および比較例の包装用フィルムの紫外可視領域における光線透過率を示すグラフである。It is a graph which shows the light transmittance in the ultraviolet visible region of the film for packaging of an Example and a comparative example.

Claims (3)

エチレンと炭素数が6個のαオレフィンを共重合させた直鎖状低密度ポリエチレン(CLLDPE)または高密度ポリエチレン(HDPE)からなる中間層と、この中間層の両面に積層された、エチレンと炭素数が4個のαオレフィンを共重合させた直鎖状低密度ポリエチレン(CLLDPE)層からなる表面層及び裏面層の3つの層からなり、表面層及び裏面層の厚さを1としたときの表面層、中間層、裏面層の3層の厚さの比が1:1:1〜1:2:1の範囲内であることを特徴とする共押出フィルム。 An intermediate layer made of linear low density polyethylene (C 6 LLDPE) or high density polyethylene (HDPE) obtained by copolymerizing ethylene and an α-olefin having 6 carbon atoms, and ethylene laminated on both sides of the intermediate layer And a surface layer composed of a linear low-density polyethylene (C 4 LLDPE) layer obtained by copolymerization of an α-olefin having 4 carbon atoms and a back layer, and the thickness of the surface layer and the back layer is 1 The ratio of the thickness of the three layers of the surface layer, the intermediate layer, and the back layer is within a range of 1: 1: 1 to 1: 2: 1. 前記表面層及び中間層が白色顔料を含有することを特徴とする請求項1に記載の共押出フィルム。   The coextruded film according to claim 1, wherein the surface layer and the intermediate layer contain a white pigment. 請求項1または2に記載の共押出フィルムの表面層側に基材フィルムがラミネートされてなり、前記共押出フィルムの裏面層がシーラント層であることを特徴とする包装用フィルム。   A packaging film, wherein a base film is laminated on the surface layer side of the coextruded film according to claim 1 or 2, and the back layer of the coextruded film is a sealant layer.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013166571A (en) * 2012-02-15 2013-08-29 Toppan Printing Co Ltd Self-standing packaging bag
JP2017052282A (en) * 2016-10-31 2017-03-16 大日本印刷株式会社 Barrier laminate film
JP2017061078A (en) * 2015-09-24 2017-03-30 三和化学株式会社 Ultraviolet-blocking resin film, sealant, and method for producing resin film
JP2019172304A (en) * 2018-03-28 2019-10-10 日本ポリエチレン株式会社 Easily tearable back-in-box film

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10278196A (en) * 1997-04-09 1998-10-20 Daicel Chem Ind Ltd Composite film and its production
JP2002067207A (en) * 2000-09-04 2002-03-05 Kyodo Printing Co Ltd Light shielding laminate
JP2005161537A (en) * 2003-11-28 2005-06-23 Toppan Printing Co Ltd Packaging material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10278196A (en) * 1997-04-09 1998-10-20 Daicel Chem Ind Ltd Composite film and its production
JP2002067207A (en) * 2000-09-04 2002-03-05 Kyodo Printing Co Ltd Light shielding laminate
JP2005161537A (en) * 2003-11-28 2005-06-23 Toppan Printing Co Ltd Packaging material

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013166571A (en) * 2012-02-15 2013-08-29 Toppan Printing Co Ltd Self-standing packaging bag
JP2017061078A (en) * 2015-09-24 2017-03-30 三和化学株式会社 Ultraviolet-blocking resin film, sealant, and method for producing resin film
JP2017052282A (en) * 2016-10-31 2017-03-16 大日本印刷株式会社 Barrier laminate film
JP2019172304A (en) * 2018-03-28 2019-10-10 日本ポリエチレン株式会社 Easily tearable back-in-box film
JP7442958B2 (en) 2018-03-28 2024-03-05 日本ポリエチレン株式会社 Easily tearable back-in-box film

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