JP5079268B2 - Method for preventing delamination of easily tearable stretched film - Google Patents

Method for preventing delamination of easily tearable stretched film Download PDF

Info

Publication number
JP5079268B2
JP5079268B2 JP2006175776A JP2006175776A JP5079268B2 JP 5079268 B2 JP5079268 B2 JP 5079268B2 JP 2006175776 A JP2006175776 A JP 2006175776A JP 2006175776 A JP2006175776 A JP 2006175776A JP 5079268 B2 JP5079268 B2 JP 5079268B2
Authority
JP
Japan
Prior art keywords
easily tearable
mxd6
stretched film
film
mass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2006175776A
Other languages
Japanese (ja)
Other versions
JP2007039664A (en
Inventor
真男 高重
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Idemitsu Unitech Co Ltd
Original Assignee
Idemitsu Unitech Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Idemitsu Unitech Co Ltd filed Critical Idemitsu Unitech Co Ltd
Priority to JP2006175776A priority Critical patent/JP5079268B2/en
Publication of JP2007039664A publication Critical patent/JP2007039664A/en
Application granted granted Critical
Publication of JP5079268B2 publication Critical patent/JP5079268B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily tearable oriented film having an excellent linearly tearable property and causing no intra-layer delamination in the oriented film layer, an easily tearable laminate film and an easily tearable bag using the same, and a process for producing the easily tearable oriented film. <P>SOLUTION: The easily tearable oriented film is made of a raw material containing a virgin raw material comprising of 60 to 85 pts.mass of Ny6 and 15 to 40 pts.mass of MXD6, and a heat history article which is prepared by melt-kneading Ny6 and MXD6, the MXD6 having a melting point of from 233 to 238&deg;C, wherein the content of the heat history article is from 5 to 40 mass% based on the total amount of the raw material. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

本発明は、易裂性延伸フィルム、易裂性ラミネートフィルム、易裂性袋、及び易裂性延伸フィルムの製造方法に関する。   The present invention relates to an easily tearable stretched film, an easily tearable laminate film, an easily tearable bag, and a method for producing an easily tearable stretched film.

日本では、高齢化社会を迎えた事情も手伝い、高齢者や障害者が若年者や健常者とともに快適な社会生活を送れるようにするため、さまざまな分野でバリア(障害)となるものを取り除く「バリアフリー」の概念が脚光を浴び始めている。
一方、食品、薬品等の包装袋のシール基材(シーラント)フィルムとしては、直鎖状低密度ポリエチレン(L−LDPE)等のフィルムが多用されている。しかし、このL−LDPEフィルムは、シール強度が優れているため安全であるが、引き裂き抵抗が大きいため使用時に切れ目に沿って真っ直ぐに切れず、開封しにくいという問題があった。
それ故、包装分野においても、「バリアフリー」への要請が非常に高まり、具体的には、各種食品用包材、医療用包材に関して、易開封性(易裂性)への要望が一層高まっている。
そこで、袋を構成するフィルムに易裂性、特に直線カット性を付与するための種々の提案がなされている。
例えば、一軸延伸フィルムを中間層として有するラミネートフィルムとした構成(特許文献1)や、表基材フィルムとしてナイロン6(以後、Ny6ともいう)とメタキシリレンアジパミド(以後、MXD6ともいう)とのブレンド樹脂からなる二軸延伸フィルムを用いた例が知られている(特許文献2、特許文献3)。
In Japan, helping with the aging society, helping elderly and people with disabilities to live a comfortable social life with young and healthy people, removes barriers (disabilities) in various fields. The concept of “barrier-free” is beginning to attract attention.
On the other hand, films such as linear low-density polyethylene (L-LDPE) are frequently used as a sealing substrate (sealant) film for packaging bags for foods, medicines and the like. However, this L-LDPE film is safe because it has excellent sealing strength, but has a problem that it is difficult to open because it has a high tear resistance and does not cut straight along the cut line during use.
Therefore, in the packaging field, the demand for “barrier-free” has been greatly increased. Specifically, for various food packaging materials and medical packaging materials, there is a further demand for easy opening (easy tearability). It is growing.
Therefore, various proposals have been made for imparting easy tearing properties, particularly straight line cutting properties, to the film constituting the bag.
For example, a laminate film having a uniaxially stretched film as an intermediate layer (Patent Document 1), and nylon 6 (hereinafter also referred to as Ny6) and metaxylylene adipamide (hereinafter also referred to as MXD6) as a surface base film. Examples using a biaxially stretched film made of a blend resin are known (Patent Document 2, Patent Document 3).

特公昭58―38302号公報Japanese Patent Publication No.58-38302 特開平5−220837号公報Japanese Patent Laid-Open No. 5-220837 特開平5−200958号公報Japanese Patent Laid-Open No. 5-200958

特許文献1に係る構成では、中間層に一軸延伸フィルムを介在させており、直線カット性は優れているが、この一軸延伸フィルムは、強度面で余り寄与するものとはなっていない。
一方、特許文献2や特許文献3に係る構成では、直線カット性に優れた表基材を与え、ラミネートフィルムとしたときでも、その優れた直線カット性を維持できるため、易裂性袋として実用上の価値が高い。しかしながら、Ny6とMXD6とのブレンド樹脂からなる二軸延伸フィルムは、ラミネートフィルムを構成した後に過酷な条件下に置かれると、二軸延伸フィルムの層内で、いわゆる層内剥離を引き起こすおそれがある。このような、層内剥離が起こると、ラミネートフィルムの強度が不安定となり、袋を構成した場合に実用上の問題が生ずる。
In the structure which concerns on patent document 1, although the uniaxially stretched film is interposed in the intermediate | middle layer and the linear cut property is excellent, this uniaxially stretched film does not contribute much in terms of strength.
On the other hand, in the structure which concerns on patent document 2 and patent document 3, since the surface base material excellent in linear cut property was given and it was set as the laminate film, since the outstanding linear cut property can be maintained, it is practical as an easily tearable bag. High value on. However, a biaxially stretched film made of a blend resin of Ny6 and MXD6 may cause so-called delamination within the layer of the biaxially stretched film when placed under harsh conditions after forming a laminate film. . When such delamination occurs, the strength of the laminate film becomes unstable, causing a practical problem when a bag is formed.

そこで、本発明の目的は、優れた直線カット性を有すると共に、延伸フィルム層において層内剥離を引き起こすことのない易裂性延伸フィルム、これを用いた易裂性ラミネートフィルム、易裂性袋、及び易裂性延伸フィルムの製造方法を提供することにある。   Therefore, the object of the present invention is an easily tearable stretch film that has excellent linear cut properties and does not cause in-layer peeling in the stretched film layer, an easily tearable laminate film, an easily tearable bag, And it is providing the manufacturing method of an easily tearable stretched film.

本発明の易裂性延伸フィルムは、ナイロン6(以後、Ny6ともいう)60〜85質量部、とメタキシリレンアジパミド(以後、MXD6ともいう)15〜40質量部(両者の合計は100質量部)とを原料として含む易裂性延伸フィルムであって、該易裂性延伸フィルムのMD方向(フィルムの移動方向)及び/又はTD方向(フィルムの幅方向)の引裂強度が70N/cm以下であり、該易裂性延伸フィルムと、直鎖状低密度ポリエチレン製フィルムとを積層してなる積層フィルムに対し、40℃で3日間エージングを行い、その後に層間剥離試験を行った場合、該易裂性延伸フィルムの内部で層内剥離が発現しないことを特徴とする。   The easily tearable stretched film of the present invention comprises nylon 6 (hereinafter also referred to as Ny6) 60 to 85 parts by mass and metaxylylene adipamide (hereinafter also referred to as MXD6) 15 to 40 parts by mass (the total of both is 100). The tear strength in the MD direction (the moving direction of the film) and / or the TD direction (the width direction of the film) of the easily tearable stretched film is 70 N / cm. It is the following, for the laminated film formed by laminating the easily tearable stretched film and the linear low density polyethylene film, aging is performed at 40 ° C. for 3 days, and then the delamination test is performed. Intralamellar peeling does not occur inside the easily tearable stretched film.

本発明の易裂性延伸フィルムによれば、原料の配合割合として、Ny6が60〜85質量部、MXD6が15〜40質量部であるため、未延伸原反フィルムをMD方向及び/又TD方向に延伸することで、同方向の引裂強度が70N/cm以下となり、直線カット性に優れる易裂性延伸フィルムが得られる。また、未延伸原反フィルムを二軸延伸すれば、耐衝撃性にも優れる易裂性延伸フィルムともなる。
また、本発明の易裂性延伸フィルムと、直鎖状低密度ポリエチレン製フィルムとを積層してなる積層フィルムに対し、40℃で3日間エージングを行い、その後に層間剥離試験を行った場合に、該易裂性延伸フィルムの内部で層内剥離が発現しないため、強度面でも非常に安定している。それ故、包装袋等の最終製品としての実用性能(易開封性)に優れる。
According to the easily tearable stretched film of the present invention, Ny6 is 60 to 85 parts by mass and MXD6 is 15 to 40 parts by weight as the mixing ratio of the raw materials, so that the unstretched raw film is MD direction and / or TD direction. By stretching the film, the tear strength in the same direction becomes 70 N / cm or less, and an easily tearable stretched film excellent in linear cut property is obtained. Moreover, if an unstretched original film is biaxially stretched, it becomes an easily tearable stretched film having excellent impact resistance.
In addition, when a laminate film formed by laminating the easily tearable stretched film of the present invention and a linear low-density polyethylene film is aged at 40 ° C. for 3 days and then subjected to a delamination test In addition, since peeling within the layer does not occur inside the easily tearable stretched film, the strength is very stable. Therefore, it is excellent in practical performance (easy openability) as a final product such as a packaging bag.

層内剥離を起こさないようにするには、Ny6とMXD6の双方に親和性のある相溶化剤を原料中に配合することが有効である。例えば、原料中に後述する熱履歴品を配合することも好ましい。
また、原料の配合割合が上述の範囲をはずれると、易裂性延伸フィルムの直線カット性や耐衝撃性が低下し、包装袋等の最終製品としての実用性能に乏しくなる。また、延伸倍率等の延伸条件が悪いと、易裂性延伸フィルムの引裂強度が70N/cmを超えてしまい、直線カット性が低下して、包装袋等の最終製品としての実用性能に乏しくなる。
なお、引裂強度の値は、エレメンドルフ引裂強度試験(JIS K 7128)にもとづくものである。
In order not to cause delamination in the layer, it is effective to add a compatibilizing agent having affinity for both Ny6 and MXD6 in the raw material. For example, it is also preferable to mix the heat history goods mentioned later in a raw material.
Moreover, if the blending ratio of the raw materials is out of the above range, the straight-cut property and impact resistance of the easily tearable stretched film are lowered, and the practical performance as a final product such as a packaging bag is poor. In addition, when the stretching conditions such as the stretching ratio are poor, the tear strength of the easily tearable stretched film exceeds 70 N / cm, the linear cut property is lowered, and the practical performance as a final product such as a packaging bag becomes poor. .
The tear strength value is based on the Elmendorf tear strength test (JIS K 7128).

本発明の易裂性延伸フィルムは、Ny6と、MXD6とを原料として含む易裂性延伸フィルムであって、前記原料は、Ny6が60〜85質量部、MXD6が15〜40質量部からなるバージン原料と、Ny6及びMXD6を溶融混練して、MXD6の融点を233〜238℃とした熱履歴品とを含み、前記熱履歴品の含有量が前記原料全量基準で5〜40質量%であることを特徴とする。   An easily tearable stretched film of the present invention is an easily tearable stretched film containing Ny6 and MXD6 as raw materials, and the raw material is virgin comprising 60 to 85 parts by mass of Ny6 and 15 to 40 parts by mass of MXD6. Including a raw material and a heat history product obtained by melting and kneading Ny6 and MXD6 to have a melting point of MXD6 of 233 to 238 ° C., and the content of the heat history product is 5 to 40% by mass based on the total amount of the raw material It is characterized by.

ここで、前記Ny6の化学式を下記の化1に示し、またMXD6の化学式を下記の化2に示す。   Here, the chemical formula of Ny6 is shown in the following chemical formula 1, and the chemical formula of MXD6 is shown in the chemical formula 2 below.

Figure 0005079268
Figure 0005079268

Figure 0005079268
Figure 0005079268

上述のバージン原料とは、通常は、Ny6とMXD6とが互いに混合され溶融混練された履歴を持つ混合原料ではない状態の原料を意味する。例えば、Ny6やMXD6が各々単独で溶融混練された履歴があっても(例えばリサイクル品)、これらが混合され溶融混練されていない場合は、バージン原料である。ただし、易裂性延伸フィルムとなったときの物性の面からは、リサイクル回数のできるだけ少ないバージン原料を用いることが好ましい。なお、Ny6とMXD6とが互いに混合され溶融混練された履歴を持っていても、その混練が弱いため、MXD6の融点降下があまりなく、238℃を超えていれば、これらのNy6とMXD6は依然としてバージン原料を構成するものであって、熱履歴品を構成するものではない。
すなわち、本発明では、バージン原料を構成するNy6とMXD6に熱履歴品を加えた三者(あるいは二者)がいわゆるドライブレンドされた後に溶融混練されて易裂性延伸フィルムを構成する。
上述の熱履歴品とは、Ny6とMXD6の配合品で、一度押出機を通過したものをいい、本発明については、示査走査熱量計(DSC)でMDX6樹脂の融点が233〜238℃の範囲に保持されたものを用いる。
The above-mentioned virgin raw material usually means a raw material that is not a mixed raw material having a history in which Ny6 and MXD6 are mixed and melt-kneaded. For example, even if Ny6 and MXD6 have a history of being melt-kneaded independently (for example, recycled products), they are virgin raw materials when they are not mixed and melt-kneaded. However, from the viewpoint of physical properties when it becomes an easily tearable stretched film, it is preferable to use a virgin raw material with as few times of recycling as possible. Even if Ny6 and MXD6 have a history of mixing and melt-kneading each other, because the kneading is weak, if the melting point of MXD6 is not so low and the temperature exceeds 238 ° C., these Ny6 and MXD6 are still It constitutes a virgin raw material, not a heat history product.
That is, in the present invention, Ny6 and MXD6 constituting the virgin raw material are added to a heat history product (or two parties), so-called dry blended and then melt-kneaded to form an easily tearable stretched film.
The above-mentioned heat history product is a blended product of Ny6 and MXD6, which has passed through the extruder once. For the present invention, the melting point of MDX6 resin is 233 to 238 ° C. with a scanning scanning calorimeter (DSC). Use the one held in the range.

本発明の易裂性延伸フィルムによれば、バージン原料におけるNy6とMXD6の配合割合は、Ny6が60〜85質量部、MXD6が15〜40質量部であるので、直線カット性に優れている。そして、原料全体に対して、Ny6及びMXD6を溶融混練してなる熱履歴品が5〜40質量%含まれているので、易裂性延伸フィルムを過酷な条件下で使用しても層内剥離を起こしにくい。
ここで、層内剥離とは、易裂性延伸フィルムを適当なシーラントフィルムとラミネートした後に過酷な条件で使用すると、易裂性延伸フィルム(ナイロン層)内で剥離を引き起こす現象をいう。層内剥離の機構は必ずしも明確ではないが、易裂性延伸フィルム内では、Ny6とMXD6が層状に配向しており、その界面で剥離が起こるものと考えられる。
このような層内剥離が起こると、ラミネートフィルムの強度が不安定となり、袋を構成した場合に過酷な使用条件下では破袋等の問題を生ずるおそれがある。このような過酷な使用条件は、例えば、ラミネートフィルムのラミネート強度(剥離強度)を測定する試験により再現することができる。
According to the easily tearable stretched film of the present invention, the blending ratio of Ny6 and MXD6 in the virgin raw material is 60 to 85 parts by mass for Ny6 and 15 to 40 parts by mass for MXD6, so that it has excellent linear cut properties. And since the heat history product formed by melt-kneading Ny6 and MXD6 is contained in the whole raw material, it is peeled in the layer even if an easily tearable stretched film is used under severe conditions. It is hard to cause.
Here, in-layer peeling refers to a phenomenon that causes peeling in an easily tearable stretched film (nylon layer) when the tearable stretched film is laminated with an appropriate sealant film and used under severe conditions. The mechanism of delamination in the layer is not necessarily clear, but it is considered that Ny6 and MXD6 are oriented in layers in the easily tearable stretched film, and delamination occurs at the interface.
When such delamination occurs, the strength of the laminate film becomes unstable, and there is a risk of problems such as broken bags under severe use conditions when a bag is constructed. Such severe use conditions can be reproduced by, for example, a test for measuring the laminate strength (peel strength) of the laminate film.

また、熱履歴品におけるMXD6の融点は233〜238℃であり、好ましくは235〜237℃である。熱履歴品におけるMXD6の融点が233℃未満になると、易裂性延伸フィルムの直線カット性と衝撃強度が低下する。また、熱履歴品におけるMXD6の融点が238℃以上であると、層内剥離を防止する効果が低くなる。
なお、熱履歴品が製造される過程で、混練時の温度や圧力が高いと熱履歴品中のMXD6の融点はより大きく下がる。
ここで、熱履歴品におけるMXD6の融点とは、バージン原料と溶融混練される前の状態で測定された融点をいう。
この易裂性延伸フィルムは、ラミネート袋の表基材として利用する場合には、二軸延伸されていることが耐衝撃性向上の点で好ましい。また、二軸延伸は、縦横の強度バランスの点で、チューブラー法による同時二軸延伸により行うことが好ましい。
また、易裂性の点では、MD方向及びTD方向のいずれの方向についても引裂強度が70N/cm以下であることが好ましい。
The melting point of MXD6 in the heat history product is 233 to 238 ° C, preferably 235 to 237 ° C. When the melting point of MXD6 in the heat history product is less than 233 ° C., the linear cut property and impact strength of the easily tearable stretched film are lowered. Further, when the melting point of MXD6 in the heat history product is 238 ° C. or higher, the effect of preventing in-layer peeling is reduced.
In addition, when the temperature and pressure at the time of kneading are high in the process of manufacturing a heat history product, the melting point of MXD6 in the heat history product is further lowered.
Here, the melting point of MXD6 in the heat history product refers to a melting point measured in a state before being melt-kneaded with the virgin raw material.
When this easily tearable stretched film is used as a surface base material of a laminate bag, biaxially stretched is preferable from the viewpoint of improving impact resistance. In addition, biaxial stretching is preferably performed by simultaneous biaxial stretching by a tubular method from the viewpoint of the balance of strength in the vertical and horizontal directions.
In terms of easy tearability, the tear strength is preferably 70 N / cm or less in both the MD direction and the TD direction.

本発明では、前記熱履歴品におけるNy6とMXD6の配合割合が、Ny6:MXD6=60〜85質量部:15〜40質量部であることが好ましい。
本発明によれば、熱履歴品におけるNy6とMXD6の配合割合が、Ny6:MXD6=60〜85質量部:15〜40質量部であるので、直線カット性、衝撃強度及び層内剥離防止効果により優れた易裂性延伸フィルムとすることができる。
In this invention, it is preferable that the mixture ratio of Ny6 and MXD6 in the said heat history goods is Ny6: MXD6 = 60-85 mass parts: 15-40 mass parts.
According to the present invention, since the blending ratio of Ny6 and MXD6 in the heat history product is Ny6: MXD6 = 60 to 85 parts by mass: 15 to 40 parts by mass, It can be set as the outstanding easily tearable stretched film.

本発明の易裂性ラミネートフィルムは、上述の易裂性延伸フィルムが複数層の少なくとも一層として形成されていることを特徴とする。
本発明の易裂性ラミネートフィルムによれば、上述の易裂性延伸フィルムが複数層の少なくとも一層として形成されているので、ラミネートフィルムとしても、直線カット性、衝撃強度に優れ、また、過酷な条件下で使用されても、ナイロン層に層内剥離を起こすことがない。
The easily tearable laminate film of the present invention is characterized in that the above easily tearable stretched film is formed as at least one of a plurality of layers.
According to the easily tearable laminate film of the present invention, since the easily tearable stretched film described above is formed as at least one of a plurality of layers, the laminate film is excellent in linear cut property and impact strength, and is harsh. Even when used under conditions, the nylon layer does not delaminate.

本発明の易裂性袋は、上述の易裂性ラミネートフィルムを使用したことを特徴とする。
本発明の易裂性袋によれば、前記した易裂性ラミネートフィルムを使用して構成されているので、開封性(直線カット性)に優れるとともに、ナイロンフィルム層で層内剥離が起こらないため、強度面でも安定した実用性の高い易裂性袋となる。
The easily tearable bag of the present invention is characterized by using the above easily tearable laminate film.
According to the easily tearable bag of the present invention, since it is constructed using the above easily tearable laminate film, it is excellent in unsealing property (straight cut property) and in-layer peeling does not occur in the nylon film layer. In addition, it is an easily tearable bag that is stable in strength and practical.

本発明の易裂性延伸フィルムの製造方法は、Ny6とMXD6とを原料として含む易裂性延伸フィルムの製造方法であって、前記原料は、Ny6が60〜85質量部、MXD6が15〜40質量部(両者の合計は100質量部)からなるバージン原料と、Ny6及びMXD6を溶融混練してなる熱履歴品とを含み、前記熱履歴品におけるMXD6の融点が233〜238℃で、かつ、前記熱履歴品の含有量が前記原料全量基準で5〜40質量%であり、MD方向(フィルムの移動方向)及びTD方向(フィルムの幅方向)共に2.8倍以上の延伸倍率で二軸延伸したことを特徴とする。   The method for producing an easily tearable stretched film of the present invention is a method for producing an easily tearable stretched film containing Ny6 and MXD6 as raw materials, wherein the raw materials are 60 to 85 parts by mass of Ny6 and 15 to 40 MXD6. Including a virgin raw material consisting of 100 parts by mass (total of both) and a heat history product obtained by melt-kneading Ny6 and MXD6, and the melting point of MXD6 in the heat history product is 233 to 238 ° C, and The content of the heat history product is 5 to 40% by mass based on the total amount of the raw material, and biaxially with a draw ratio of 2.8 times or more in both the MD direction (film moving direction) and the TD direction (film width direction). It is characterized by stretching.

本発明の易裂性延伸フィルムの製造方法によれば、Ny6とMXD6とを原料として含み、所定の延伸倍率で延伸しているため、製造後のフィルムは、直線カット性に優れ、ラミネートフィルムを構成した場合であっても、その良好な直線カット性を維持できる。また、MD方向及びTD方向への二軸延伸であれば耐衝撃性にも優れる。さらに、原料中に、所定の熱履歴品を含有しているため、ラミネートフィルム(袋)を過酷な条件で取り扱っても、ナイロン層が層内剥離を起こすことはない。
また、MD方向及び/又はTD方向の延伸倍率は、2.8倍以上とするが、好ましくは3.0倍以上とする。延伸倍率が2.8倍より小さい場合には、直線カット性が劣るようになる。また二軸延伸であっても、耐衝撃性が低下して実用性に問題が生ずる。なお、延伸は、チューブラー法による同時二軸延伸により行うことが、MD方向とTD方向の強度バランスの点で好ましい。
According to the method for producing an easily tearable stretched film of the present invention, since Ny6 and MXD6 are included as raw materials and stretched at a predetermined stretch ratio, the film after manufacture is excellent in linear cut property and a laminate film. Even in the case of the configuration, the good linear cut property can be maintained. Moreover, if it is biaxial stretching to MD direction and TD direction, it is excellent also in impact resistance. Furthermore, since the raw material contains a predetermined heat history product, the nylon layer does not peel in the layer even when the laminate film (bag) is handled under severe conditions.
Moreover, although the draw ratio of MD direction and / or TD direction shall be 2.8 times or more, Preferably it shall be 3.0 times or more. When the draw ratio is less than 2.8 times, the linear cut property becomes inferior. Even biaxial stretching causes a problem in practicality due to a decrease in impact resistance. In addition, it is preferable to perform extending | stretching by simultaneous biaxial stretching by a tubular method at the point of the intensity | strength balance of MD direction and TD direction.

本発明の易裂性延伸フィルムは、上述したように、原料中のNy6とMXD6の配合量等の条件を満たすかぎり製造方法には特に限定されないが、以下に、本発明を実施するための最良の形態について詳述する。
[第1実施形態]
本実施形態に係る易裂性延伸フィルムは、Ny6とMXD6とを原料として含み、この
原料は、Ny6が60〜85質量部、MXD6が15〜40質量部からなるバージン原料と、Ny6及びMXD6を溶融混練してなる熱履歴品とを含み、熱履歴品におけるMXD6の融点が233〜238℃で、かつ、熱履歴品の含有量が原料全量基準で5〜40質量%である。ここで、Ny6の化学式は化3に示し、MXD6の化学式は化4に示す。
As described above, the easily tearable stretched film of the present invention is not particularly limited to the production method as long as it satisfies the conditions such as the blending amount of Ny6 and MXD6 in the raw material, but the best for carrying out the present invention is described below. Will be described in detail.
[First Embodiment]
The easily tearable stretched film according to the present embodiment includes Ny6 and MXD6 as raw materials, and this raw material includes virgin raw materials composed of 60 to 85 parts by mass of Ny6 and 15 to 40 parts by mass of MXD6, and Ny6 and MXD6. The melting point of MXD6 in the heat history product is 233 to 238 ° C., and the content of the heat history product is 5 to 40% by mass based on the total amount of raw materials. Here, the chemical formula of Ny6 is shown in Chemical Formula 3, and the chemical formula of MXD6 is shown in Chemical Formula 4.

Figure 0005079268
Figure 0005079268

Figure 0005079268
Figure 0005079268

バージン原料におけるNy6とMXD6の配合割合は、製膜後のフィルムの直線カット性と衝撃強度の観点から、Ny6が60〜85質量部、MXD6が15〜40質量部であることが必要である。バージン原料におけるMXD6が15質量部より少ない場合には、直線カット性が劣るようになる。また、MXD6が40質量部より多い場合には、衝撃強度が大幅に低下して実用性に乏しくなる。
バージン原料を構成するNy6とMXD6は、いずれもペレット状のものをドライブレンドして使用することが好ましい。
The blending ratio of Ny6 and MXD6 in the virgin raw material is required to be 60 to 85 parts by mass of Ny6 and 15 to 40 parts by mass of MXD6 from the viewpoint of the linear cut property and impact strength of the film after film formation. When the MXD6 in the virgin raw material is less than 15 parts by mass, the linear cut property becomes inferior. Moreover, when there is more MXD6 than 40 mass parts, impact strength will fall significantly and it will become scarce practicality.
Ny6 and MXD6 constituting the virgin raw material are preferably used by dry blending pellets.

原料中には、Ny6及びMXD6を溶融混練してなる熱履歴品とが含まれていることが必要である。また、熱履歴品におけるMXD6の融点は233〜238℃であり、好ましくは235〜237℃である。熱履歴品におけるMXD6の融点が233℃未満になると、易裂性延伸フィルムの直線カット性と衝撃強度が低下する。また、熱履歴品におけるMXD6の融点が238℃以上になると、層内剥離を防止する効果が低くなる。   The raw material must contain a heat history product formed by melt-kneading Ny6 and MXD6. The melting point of MXD6 in the heat history product is 233 to 238 ° C, preferably 235 to 237 ° C. When the melting point of MXD6 in the heat history product is less than 233 ° C., the linear cut property and impact strength of the easily tearable stretched film are lowered. In addition, when the melting point of MXD6 in the heat history product is 238 ° C. or higher, the effect of preventing in-layer peeling is reduced.

さらにまた、原料全体に対して、Ny6及びMXD6を溶融混練してなる熱履歴品が5〜40質量%含まれていることが必要である。熱履歴品が5質量%未満では、易裂性延伸フィルムをラミネートフィルムとした後に、過酷な条件下で使用すると層内剥離を起こしやすくなる。また、熱履歴品が40質量%を超えると、易裂性延伸フィルムの直線カット性や衝撃強度が低下する。
なお、熱履歴品におけるNy6とMXD6の配合割合は、Ny6:MXD6=60〜85質量部:15〜40質量部であることが好ましい。
熱履歴品におけるNy6とMXD6の配合割合は、Ny6が60〜85質量部、MXD6が15〜40質量部であるので、直線カット性、衝撃強度及び層内剥離防止効果により優れた易裂性延伸フィルムとすることができる。
熱履歴品におけるMXD6の配合割合が15質量部未満(Ny6の配合割合が85質量部より多い)であると、易裂性延伸フィルムとした場合に層内剥離防止効果が低くなる。熱履歴品におけるMXD6の配合割合が40質量部を越えると(Ny6の配合割合が60質量部未満)であると易裂性延伸フィルムの直線カット性、衝撃強度が低下する。
Furthermore, it is necessary that the heat history product formed by melt-kneading Ny6 and MXD6 is contained in an amount of 5 to 40% by mass with respect to the entire raw material. If the heat history product is less than 5% by mass, peeling within the layer is likely to occur if the easily tearable stretched film is used as a laminate film and then used under severe conditions. Moreover, when a heat history product exceeds 40 mass%, the linear cut property and impact strength of an easily tearable stretched film will fall.
In addition, it is preferable that the mixture ratio of Ny6 and MXD6 in a heat history goods is Ny6: MXD6 = 60-85 mass parts: 15-40 mass parts.
Ny6 is 60-85 parts by mass and MXD6 is 15-40 parts by mass in the heat history product. It can be a film.
When the blending ratio of MXD6 in the heat history product is less than 15 parts by mass (the blending ratio of Ny6 is more than 85 parts by mass), the effect of preventing in-layer peeling is reduced when an easily tearable stretched film is used. When the blending ratio of MXD6 in the heat history product exceeds 40 parts by mass (the blending ratio of Ny6 is less than 60 parts by mass), the linear cut property and impact strength of the easily tearable film are lowered.

この熱履歴品は、本実施形態により得られた易裂性延伸フィルムをリサイクルしたものでもよい。また、熱履歴品を、Ny6のペレット及びMXD6のペレットとうまくドライブレンドするには、熱履歴品の形状をペレット状に加工して用いることが望ましい。例えば、本実施形態により得られた易裂性延伸フィルムを細かく切断・圧縮してそのような形状としてもよい。   This heat history product may be a product obtained by recycling the easily tearable stretched film obtained according to this embodiment. Moreover, in order to dry blend the heat history product with the Ny6 pellet and the MXD6 pellet well, it is desirable to process the shape of the heat history product into a pellet. For example, the easily tearable stretched film obtained according to the present embodiment may be cut and compressed into such a shape.

この易裂性延伸フィルムは、ラミネート袋の表基材として利用する場合には、二軸延伸されていることが好ましい。二軸延伸は、縦横の強度バランスの点で、チューブラー法による同時二軸延伸により行うことが好ましい。また、MD方向及びTD方向のいずれの方向についても引裂強度が70N/cm以下であることが直線カット性を向上させる点で好ましい。   This easily tearable stretched film is preferably biaxially stretched when used as a front substrate of a laminate bag. Biaxial stretching is preferably performed by simultaneous biaxial stretching by a tubular method from the viewpoint of the balance of strength in the vertical and horizontal directions. Moreover, it is preferable that the tear strength is 70 N / cm or less in any of the MD direction and the TD direction from the viewpoint of improving the linear cut property.

なお、易裂性延伸フィルムには、必要な添加剤を適宜添加することができる。このような添加剤として、例えばアンチブロッキング剤(無機フィラー等)、はっ水剤(エチレンビスステアリン酸エステル等)、滑剤(ステアリン酸カルシウム等)を挙げることができる。   In addition, a required additive can be suitably added to an easily tearable stretched film. Examples of such additives include anti-blocking agents (such as inorganic fillers), water repellents (such as ethylene bis stearates), and lubricants (such as calcium stearate).

このような易裂性延伸フィルムは、例えば、図1に示すようなチューブラー方式の二軸延伸装置を用いて製造することができる。例えば、Ny6のペレット、MXD6のペレット及び熱履歴品をドライブレンドした混合物を溶融押出しした後、冷却した原反フィルムをMD方向及びTD方向共に2.8倍以上の倍率で二軸延伸することにより製造できる。   Such an easily tearable stretched film can be manufactured using, for example, a tubular biaxial stretching apparatus as shown in FIG. For example, after melt-extruding a mixture of Ny6 pellets, MXD6 pellets and a heat history product dry blended, the cooled original film is biaxially stretched at a magnification of 2.8 times or more in both MD and TD directions. Can be manufactured.

このような実施形態によれば、バージン原料におけるNy6とMXD6の配合割合が、Ny6が60〜85質量部、MXD6が15〜40質量部であり、これにNy6及びMXD6を溶融混練してなる熱履歴品とを含み、この熱履歴品におけるMXD6の融点が233〜238℃で、かつ、熱履歴品の含有量が原料全量基準で5〜40質量%であるので、直線カット性と衝撃強度に優れるとともに、過酷な条件下で使用しても層内剥離を起こしにくい易裂性延伸フィルムが得られる。   According to such an embodiment, the mixing ratio of Ny6 and MXD6 in the virgin raw material is 60 to 85 parts by mass of Ny6 and 15 to 40 parts by mass of MXD6, and heat obtained by melt-kneading Ny6 and MXD6 thereto Since the melting point of MXD6 in this heat history product is 233 to 238 ° C. and the content of the heat history product is 5 to 40% by mass based on the total amount of raw materials, While being excellent, an easily tearable stretched film is obtained that hardly causes delamination even when used under severe conditions.

[第2実施形態]
本発明の易裂性ラミネートフィルムは、易裂性延伸フィルムを少なくとも1層として含み、2層、3層等何層であってもよい。図2〜図4に、本実施形態に係る易裂性ラミネートフィルム100、200、300を示した。ここで、例えば、図2に示すように、第1層を易裂性延伸フィルム18、第2層を各種シーラントフィルム19とした2層構造、図2に示すように、第1層を各種基材フィルム20、第2層を易裂性延伸フィルム18、第3層を各種シーラントフィルム19とした3層構造、図3に示すように、第1層を易裂性延伸フィルム18、第2層を各種基材フィルム20、第3層を各種シーラントフィルム19とした3層構造としてもよい。
[Second Embodiment]
The easily tearable laminate film of the present invention may include an easily tearable stretched film as at least one layer, and may have any number of layers such as two layers and three layers. 2 to 4 show the easily tearable laminate films 100, 200, and 300 according to the present embodiment. Here, for example, as shown in FIG. 2, a two-layer structure in which the first layer is an easily tearable stretched film 18 and the second layer is various sealant films 19, and as shown in FIG. A three-layer structure in which the material film 20, the second layer is an easily tearable stretched film 18, and the third layer is various sealant films 19, as shown in FIG. 3, the first layer is an easily tearable stretched film 18, the second layer It is good also as a 3 layer structure which used various base film 20 and the 3rd layer as various sealant films 19.

基材フィルム20の材料としては、例えばPET(ポリエチレンテレフタレート)、EVOH(エチレン−酢酸ビニル共重合体ケン化物)、PVA(ポリビニルアルコール)、PP(ポリプロピレン)、PVDC(ポリ塩化ビニリデン)、HDPE(高密度ポリエチレン)、PS(ポリスチレン)等の二軸若しくは一軸延伸フィルム又は無延伸フィルムを使用できる。なお、このような樹脂系フィルムの他、アルミニウム箔のような金属フィルムを使用してもよい。   Examples of the material of the base film 20 include PET (polyethylene terephthalate), EVOH (saponified ethylene-vinyl acetate copolymer), PVA (polyvinyl alcohol), PP (polypropylene), PVDC (polyvinylidene chloride), HDPE (high Biaxial or uniaxially stretched films such as density polyethylene) and PS (polystyrene) or unstretched films can be used. In addition to such a resin film, a metal film such as an aluminum foil may be used.

シーラントフィルム19の材料としては、L−LDPE(直鎖状低密度ポリエチレン)、LDPE(低密度ポリエチレン)、HDPE(高密度ポリエチレン)、EVA(エチレン−酢酸ビニル共重合体)、PB(ポリブテン−1)、CPP(未延伸ポリプロピレン)、アイオノマー、PMMA(ポリメチルメタクリレート)等及びこれらの混合物を使用できる。前記易裂性ラミネートフィルムのラミネート方式としては、例えばエクストルージョンラミネート、ホットメルトラミネート、ドライラミネート、ウエットラミネート等がある。   As a material of the sealant film 19, L-LDPE (linear low density polyethylene), LDPE (low density polyethylene), HDPE (high density polyethylene), EVA (ethylene-vinyl acetate copolymer), PB (polybutene-1) ), CPP (unstretched polypropylene), ionomer, PMMA (polymethylmethacrylate), and the like, and mixtures thereof. Examples of the laminating method of the easily tearable laminate film include an extrusion laminate, a hot melt laminate, a dry laminate, and a wet laminate.

本実施形態によれば、易裂性ラミネートフィルム100、200、300は、上述の易裂性延伸フィルム18が複数層の少なくとも一層として形成されているので、ラミネートフィルムとしても、易裂性、直線カット性、衝撃強度に優れ、また、過酷な条件下で使用されても、ナイロン層に層内剥離を起こすことがない。すなわち、この易裂性ラミネートフィルム100、200、300を用いて袋を製造すれば、その特性を生かした易裂性袋400(図5)として利用できる。   According to the present embodiment, the easily tearable laminate films 100, 200, and 300 are formed by forming at least one layer of the above-described easily tearable stretched film 18, so that the laminate film is easily tearable and straight. Excellent cutability and impact strength. Even when used under severe conditions, the nylon layer does not peel off. That is, if a bag is manufactured using this easily tearable laminate film 100, 200, 300, it can be used as an easily tearable bag 400 (FIG. 5) utilizing the characteristics.

本発明を実施するための最良の構成などは、以上の記載で開示されているが、本発明は、これに限定されるものではない。すなわち、本発明は、主に特定の実施形態に関して説明されているが、本発明の技術的思想および目的の範囲から逸脱することなく、以上述べた実施形態に対し、材質、数量、その他の詳細な構成において、当業者が様々な変形を加えることができるものである。
したがって、上記に開示した材質、層構成などを限定した記載は、本発明の理解を容易にするために例示的に記載したものであり、本発明を限定するものではないから、それらの材質などの限定の一部若しくは全部の限定を外した名称での記載は、本発明に含まれるものである。
Although the best configuration for carrying out the present invention has been disclosed in the above description, the present invention is not limited to this. That is, the present invention has been described primarily with reference to specific embodiments, but with respect to the above-described embodiments without departing from the scope of the technical idea and object of the present invention, the material, quantity, and other details. In this configuration, those skilled in the art can make various modifications.
Accordingly, the description of the materials, layer structures, and the like disclosed above is exemplary for easy understanding of the present invention, and does not limit the present invention. Descriptions with names excluding some or all of the limitations are included in the present invention.

例えば、本実施形態では、易裂性延伸フィルムとして、二軸延伸フィルムを製造したが、一軸延伸フィルムでもよい。例えば、図5の易裂性袋で、TD方向に配向した一軸延伸フィルムを表基材フィルムとして使用してもよい。直線カット性が特に重視される場合に好適である。
また、本実施形態では、二軸延伸方法としてチューブラー方式を採用したが、テンター方式でもよい。さらに、延伸方法としては同時二軸延伸でも逐次二軸延伸でもよい。
For example, in this embodiment, a biaxially stretched film is manufactured as an easily tearable stretched film, but a uniaxially stretched film may be used. For example, a uniaxially stretched film oriented in the TD direction in the easily tearable bag of FIG. 5 may be used as the front substrate film. This is suitable when the straight cut is particularly important.
Moreover, in this embodiment, although the tubular system was employ | adopted as a biaxial stretching method, a tenter system may be used. Furthermore, the stretching method may be simultaneous biaxial stretching or sequential biaxial stretching.

次に、実施例及び比較例により本発明をさらに詳細に説明する。ただし、本発明はこれらの例によって何等限定されるものではない。
[実施例1]
(易裂性延伸フィルムの製造)
Ny6ペレット及びMXD6ペレットをそれぞれ70質量部及び30質量部の割合で混合したものに対して、すでに一度、この配合比で溶融混合してペレット化した熱履歴品(MXD6の融点が236℃のもの)を原料全量に対して15質量%配合した。このドライブレンド品を押出機中、270℃で溶融混練した後、溶融物をダイスから円筒状のフィルムとして押出し、引き続き水で急冷して原反フィルムを作製した。
なお、MXD6の融点は、パーキンエルマー社製示差走査熱量測定装置(DSC)を用い、昇温速度10℃/minで50℃から280℃まで昇温を行って測定した。いずれもファーストランにおける値を融点とした。
Next, the present invention will be described in more detail with reference to examples and comparative examples. However, the present invention is not limited to these examples.
[Example 1]
(Manufacture of easy tear film)
Ny6 pellets and MXD6 pellets are mixed at a ratio of 70 parts by weight and 30 parts by weight, respectively, and heat history products that have already been melt-mixed and pelletized at this blending ratio (with a melting point of MXD6 of 236 ° C) ) Was blended in an amount of 15% by mass based on the total amount of raw materials. After this dry blend product was melt-kneaded at 270 ° C. in an extruder, the melt was extruded as a cylindrical film from a die and then rapidly cooled with water to produce a raw film.
The melting point of MXD6 was measured by increasing the temperature from 50 ° C. to 280 ° C. at a temperature increase rate of 10 ° C./min using a differential scanning calorimeter (DSC) manufactured by PerkinElmer. In all cases, the value in the first run was taken as the melting point.

Ny6として使用したものは、宇部興産(株)製ナイロン6〔UBEナイロン 1023FD(商品名)、相対粘度 ηr=3.6〕であり、MXD6として使用したものは、
三菱ガス化学(株)製メタキシリレンアジパミド〔MXナイロン 6007(商品名)、相対粘度ηr=2.7〕である。
また、Ny6とMXD6の配合割合を、それぞれ70質量部と30質量部とし、40φEX、シングルスクリュー(株式会社山口製作所製)を用い、270℃で押出したものを熱履歴品とした。
What was used as Ny6 is Ube Industries, Ltd. nylon 6 [UBE nylon 1023FD (trade name), relative viscosity ηr = 3.6]. What was used as MXD6 is
It is metaxylylene adipamide [MX nylon 6007 (trade name), relative viscosity ηr = 2.7] manufactured by Mitsubishi Gas Chemical Co., Ltd.
Moreover, the mixture ratio of Ny6 and MXD6 was 70 parts by mass and 30 parts by mass, respectively, and 40φEX, a single screw (manufactured by Yamaguchi Seisakusho Co., Ltd.) was used and extruded at 270 ° C. to obtain a heat history product.

次に、図1に示すように、この原反フィルム11を一対のニップロール12間に挿通した後、中に気体を圧入しながらヒータ13で加熱すると共に、延伸開始点にエアーリング14よりエアー15を吹き付けてバブル16に膨張させ、下流側の一対のニップロール17で引き取ることにより、チューブラー法によるMD方向及びTD方向の同時二軸延伸を行った。この延伸の際の倍率は、MD方向及びTD方向共に3.0倍であった。
次に、この延伸フィルムをテンター式熱処理炉(図示せず)に入れ、210℃で熱固定を施して本実施例に係る易裂性延伸フィルム18(以後、延伸フィルム18ともいう)を得た。
Next, as shown in FIG. 1, the raw film 11 is inserted between a pair of nip rolls 12 and then heated by a heater 13 while a gas is being pressed into the film 11. Was blown into the bubble 16 and taken up by a pair of downstream nip rolls 17 to perform simultaneous biaxial stretching in the MD direction and the TD direction by the tubular method. The magnification at the time of stretching was 3.0 times in both the MD direction and the TD direction.
Next, this stretched film was put in a tenter-type heat treatment furnace (not shown) and heat-set at 210 ° C. to obtain an easily tearable stretched film 18 (hereinafter also referred to as stretched film 18) according to this example. .

(易裂性ラミネートフィルムの製造)
次に、この延伸フィルム18(厚さ15μm)を表基材フィルム、L−LDPEフィルム〔ユニラックス LS−711C(商品名)、出光ユニテック(株)製、厚さ50μm〕をシーラントフィルムとして、両者をドライラミネートして本実施例に係る易裂性ラミネートフィルム(以後、ラミネートフィルムともいう)を得た。なお、ドライラミネート用の接着剤としては、三井タケダケミカル製のタケラックA−615/タケネートA−65の配合品(配合比16/1)を用いた。また、ドライラミネート後のラミネートフィルムは、40℃で3日間エージングを行った。
(Manufacture of easy tear laminate film)
Next, the stretched film 18 (thickness 15 μm) was used as a surface base film, an L-LDPE film (Unilux LS-711C (trade name), manufactured by Idemitsu Unitech Co., Ltd., thickness 50 μm), and a sealant film. Was dry laminated to obtain an easily tearable laminate film (hereinafter also referred to as a laminate film) according to this example. In addition, as an adhesive for dry lamination, a blended product of Takelac A-615 / Takenate A-65 (mixing ratio 16/1) manufactured by Mitsui Takeda Chemical was used. The laminated film after dry lamination was aged at 40 ° C. for 3 days.

〔評価方法〕
(延伸成形性)
延伸フィルム18の製膜時におけるバブルの安定性を延伸成形性として評価した。具体的には、バブルが安定しているものをA、バブルの揺れがあって不安定なものをCとして評価した。なお、当初、バブルの揺れがあっても、微調節でバブルを安定化できたものは、Bとした。
(衝撃強度)
衝撃強度の測定は、延伸フィルム18について行った。
東洋精機(株)製のフィルム・インパクト・テスターを使用し、固定されたリング状のフィルムに半円球状の振り子(直径1/2インチ)を打ち付けて、フィルムの打ち抜きに要した衝撃強度を測定することにより行った。そして、衝撃強度が45,000J/m以上をA、45,000J/m未満をCとして評価した。この衝撃強度が45,000J/mより小さくなると、表基材としての性能が低下してゆき、液体包装用基材としての実用性が乏しくなる。
〔Evaluation method〕
(Stretch formability)
The stability of bubbles at the time of forming the stretched film 18 was evaluated as stretch moldability. Specifically, the case where the bubble was stable was evaluated as A, and the case where the bubble was unstable and unstable was evaluated as C. In addition, even if there was shaking of the bubble at first, B was the one that could stabilize the bubble by fine adjustment.
(Impact strength)
The impact strength was measured on the stretched film 18.
Using a film impact tester manufactured by Toyo Seiki Co., Ltd., a semi-circular pendulum (1/2 inch in diameter) was hit against a fixed ring-shaped film to measure the impact strength required to punch the film. It was done by doing. An impact strength of 45,000 J / m or more was evaluated as A, and less than 45,000 J / m was evaluated as C. When the impact strength is less than 45,000 J / m, the performance as a surface base material is lowered, and the practicality as a liquid packaging base material becomes poor.

(直線カット性)
直線カット性は、延伸フィルム18について行った。
図6に示すように、20cm幅のフィルム18に所定間隔Ws(例えば2cm間隔)で切れ
目21を入れ、これらの切れ目21に沿ってフィルム18を引き裂いた後、フィルム片18Aの他端22の幅Weを測定し、元の間隔Wsとの偏差αを下記の式で求める。
α=〔|Ws−We|/Ws〕×100
(Linear cut property)
The straight cut property was performed on the stretched film 18.
As shown in FIG. 6, cuts 21 are made in a 20 cm wide film 18 at predetermined intervals Ws (for example, 2 cm intervals), the film 18 is torn along these cuts 21, and then the width of the other end 22 of the film piece 18A. We are measured, and a deviation α from the original interval Ws is obtained by the following equation.
α = [| Ws−We | / Ws] × 100

この測定を10枚のフィルム片18Aに対して行い、その平均値のα(%)が±10%未満のものをA(直線カット性が非常に良好)、±10%≦α≦±30%ものをA(直線カット性が良好)、α(%)が±30%を越えるものをC(直線カット性が不良)として評価した。α(%)が±30%を越えるとフィルム18を真っ直ぐに切ることが困難になる。 This measurement is performed on 10 pieces of film 18A, and the average value α (%) is less than ± 10% when A + (the linear cut property is very good), ± 10% ≦ α ≦ ± 30. % Was evaluated as A (good linear cut performance), and α (%) exceeded ± 30% as C (bad linear cut performance). If α (%) exceeds ± 30%, it is difficult to cut the film 18 straight.

(層内剥離)
上述のラミネートフィルムから15mm幅の短冊状試験片を切り出し、その端部を手で数cmほど界面剥離を行い、表基材フィルム(延伸フィルム18)とシーラントフィルムとに分離した。その後、各々のフィルム片を引張り試験機(インストロン万能試験機 1123型)にセットして、300mm/minの速度でラミネート部分の剥離試験を行った(90度剥離)。
剥離試験の最中に表基材フィルム内部で層内剥離が生ずると剥離強度が急激に減少するため、そのような挙動が発現したか否かで層内剥離発生の有無を判別できる。例えば、剥離試験の開始時は、剥離強度が7N/m程度であったものが、剥離試験の途中で急激に1〜2N/m程度に減少すれば、層内剥離が生じたと判断できる。
そして、表基材フィルム内部で層内剥離の挙動を示さないものをA、層内剥離の挙動を示したものをCとして評価した。
(In-layer peeling)
A strip-shaped test piece having a width of 15 mm was cut out from the above-mentioned laminate film, and the end thereof was subjected to interfacial peeling by several cm by hand to separate it into a front substrate film (stretched film 18) and a sealant film. Thereafter, each film piece was set in a tensile tester (Instron universal tester 1123 type), and a peel test of the laminate portion was performed at a speed of 300 mm / min (90 ° peel).
In the middle of the peel test, if peeling inside the surface substrate film occurs, the peel strength sharply decreases. Therefore, it can be determined whether or not such peeling has occurred, depending on whether or not such behavior has occurred. For example, at the start of the peel test, if the peel strength is about 7 N / m, but is suddenly reduced to about 1 to 2 N / m during the peel test, it can be determined that in-layer peel has occurred.
And the thing which did not show the behavior of peeling in a layer inside a surface base film was evaluated as A, and the thing which showed the behavior of peeling in a layer was evaluated as C.

(引裂強度)
引裂強度の測定は、延伸フィルム18について行った。
エレメンドルフ引裂強度試験(JIS K 7128)にもとづき、延伸フィルム18のMD方向及びTD方向の引裂強度を測定した。そして、引裂強度が70N/cm以下をA、71N/cm以上をCとして評価した。この引裂強度が70N/cm以下であることが直線カット性を向上させる点で好ましい。しかし、引裂強度が71N/cm以上であると、直線カット性が低下してしまい、液体包装用基材としての実用性能が乏しくなる。
(Tear strength)
The tear strength was measured on the stretched film 18.
Based on the Elmendorf tear strength test (JIS K 7128), the tear strength in the MD direction and the TD direction of the stretched film 18 was measured. And tear strength evaluated 70 N / cm or less as A and 71 N / cm or more as C. The tear strength is preferably 70 N / cm or less from the viewpoint of improving the linear cut property. However, if the tear strength is 71 N / cm or more, the linear cutability is lowered, and the practical performance as a liquid packaging substrate is poor.

(総合評価)
上述した延伸成形性、衝撃強度、直線カット性、層内剥離、及び引裂強度の5項目すべてにA以上がつくものをAとする総合評価を行った。上述の5項目のうち、一つでもCがあれば総合評価としてCとした。
(Comprehensive evaluation)
A comprehensive evaluation was made with A having A or more in all the five items of stretch moldability, impact strength, linear cutability, delamination in the layer, and tear strength described above. If there is at least one C among the above five items, it is set as C for comprehensive evaluation.

[実施例2〜6、比較例1〜6]
上記実施例1において、Ny6ペレット、MXD6ペレット、及び熱履歴品の混合量、さらに、熱履歴品におけるMXD6の融点を変えて、実施例1と同様の製造工程により製膜を行った。評価試験も実施例1と同様に行った。表1に、実施例、表2に、比較例の製造条件を示す。
[Examples 2-6, Comparative Examples 1-6]
In the said Example 1, the mixed amount of Ny6 pellet, MXD6 pellet, and a heat history goods, and also melting | fusing point of MXD6 in a heat history goods were changed, and it formed into a film by the manufacturing process similar to Example 1. The evaluation test was also performed in the same manner as in Example 1. Table 1 shows the manufacturing conditions of the examples, and Table 2 shows the manufacturing conditions of the comparative examples.

Figure 0005079268
Figure 0005079268

Figure 0005079268
Figure 0005079268

[評価結果]
表1、表2に示すように、本実施例に係る延伸フィルム18は、Ny6とMXD6とを原料として含み、この原料がNy6が60〜85質量部、MXD6が15〜40質量からなるバージン原料と、Ny6及びMXD6を溶融混練してなる熱履歴品とを含み、熱履歴品におけるMXD6の融点が233〜238℃で、かつ、熱履歴品の含有量が前記原料全量基準で5〜40質量%の範囲にあるため、延伸成形性、衝撃強度、直性カット性、及び層内剥離防止効果、及び引裂強度のいずれについても優れている。
[Evaluation results]
As shown in Tables 1 and 2, the stretched film 18 according to the present example contains Ny6 and MXD6 as raw materials, and the raw materials are 60 to 85 parts by mass of Ny6 and 15 to 40 parts by mass of MXD6. And a heat history product obtained by melt-kneading Ny6 and MXD6, the melting point of MXD6 in the heat history product is 233 to 238 ° C., and the content of the heat history product is 5 to 40 mass based on the total amount of the raw material. %, It is excellent in all of stretch moldability, impact strength, straightness cut property, in-layer peeling prevention effect, and tear strength.

一方、比較例は、上述の条件を満たしていないため、いずれも、延伸フィルム18の物性に問題がある。具体的には、比較例1は、原料として熱履歴品を含有していないため、ナイロンフィルム層で層内剥離を起こしている。また、比較例2は、熱履歴品の含有量が45質量%と多いため、衝撃強度、直線カット性、及び引裂強度に劣る。比較例3は、熱履歴品におけるMXD6の融点が232℃と低いため、直線カット性に劣る。比較例4は、熱履歴品の含有量が少ないため、比較例1と同じく、ナイロンフィルム層で層内剥離を起こしている。比較例5では、熱履歴品の融点が210℃とかなり低いため衝撃強度と直線カット性、及び引裂強度がともに劣る。また延伸成形性も不良である。比較例6では、Ny6の含有量が多すぎるため、直線カット性と引裂強度に劣る。   On the other hand, since the comparative examples do not satisfy the above-described conditions, there are problems with the physical properties of the stretched film 18. Specifically, since Comparative Example 1 does not contain a heat history product as a raw material, in-layer peeling occurs in the nylon film layer. Moreover, since the content of a heat history goods is as large as 45 mass%, the comparative example 2 is inferior to impact strength, linear cut property, and tear strength. Since the melting point of MXD6 in the heat history product is as low as 232 ° C., the comparative example 3 is inferior in linear cut property. In Comparative Example 4, since the content of the heat history product is small, in the same manner as Comparative Example 1, in-layer peeling occurs in the nylon film layer. In Comparative Example 5, since the melting point of the heat history product is as low as 210 ° C., both the impact strength, the linear cut property, and the tear strength are inferior. Also, stretch moldability is poor. In Comparative Example 6, since the content of Ny6 is too large, the linear cut property and the tear strength are inferior.

本発明は、包装材料等として衝撃強度、直線カット性に優れるとともに層内剥離を起こすことのない易裂性延伸フィルム、易裂性ラミネートフィルム、及び易裂性袋として利用することができる。   INDUSTRIAL APPLICABILITY The present invention can be used as an easily tearable stretched film, an easily tearable laminate film, and an easily tearable bag that is excellent in impact strength and linear cutability as a packaging material or the like and does not cause delamination within the layer.

本発明の第1実施形態に係る易裂性延伸フィルムの製造方法において使用する二軸延伸装置の概略図。Schematic of the biaxial stretching apparatus used in the manufacturing method of the easily tearable stretched film which concerns on 1st Embodiment of this invention. 本発明の第2実施形態に係る易裂性ラミネートフィルムの一例を示す断面図。Sectional drawing which shows an example of the easily tearable laminated film which concerns on 2nd Embodiment of this invention. 前記実施形態における易裂性ラミネートフィルムの一例を示す断面図。Sectional drawing which shows an example of the easily tearable laminated film in the said embodiment. 前記実施形態における易裂性ラミネートフィルムの一例を示す断面図。Sectional drawing which shows an example of the easily tearable laminated film in the said embodiment. 前記実施形態における易裂性袋を示す正面図。The front view which shows the easily tearable bag in the said embodiment. 本発明の実施例に係る直線カット性の評価方法を示す図。The figure which shows the evaluation method of the linear cut property which concerns on the Example of this invention.

符号の説明Explanation of symbols

11 原反フィルム
16 バブル
18 易裂性延伸フィルム
100 易裂性ラミネートフィルム
400 易裂性袋
11 Raw film 16 Bubble 18 Easy tear stretched film 100 Easy tear laminate film 400 Easy tear bag

Claims (4)

ナイロン6(以後、Ny6という)と、メタキシレンアジパミド(以後、MXD6という)とを原料として含む易裂性延伸フィルムの層内剥離防止方法であって、
Ny6が60〜85質量部、MXD6が15〜40質量部からなるバージン原料に対し
Ny6及びMXD6を溶融混練して、MXD6の融点を233〜238℃とした熱履歴品を、
前記熱履歴品の含有量が前記原料全量基準で5〜40質量%となるように配合することを特徴とする易裂性延伸フィルムの層内剥離防止方法
A method for preventing in-layer peeling of an easily tearable stretched film comprising nylon 6 (hereinafter referred to as Ny6) and metaxylene adipamide (hereinafter referred to as MXD6) as raw materials,
Ny6 60 to 85 parts by weight, relative to virgin material MXD6 consists 15 to 40 parts by weight,
Ny6 and MXD6 were melt-kneaded to obtain a heat history product having a melting point of MXD6 of 233 to 238 ° C.
Interlayer detachment prevention method tearable stretched film, characterized in that the content of the thermal history article is formulated to be 5 to 40 mass% in the raw material total amount.
請求項1に記載の易裂性延伸フィルムの層内剥離防止方法において、
前記熱履歴品におけるNy6とMXD6の配合割合は、Ny6:MXD6=60〜85質量部:15〜40質量部であることを特徴とする易裂性延伸フィルムの層内剥離防止方法
In the method for preventing in-layer peeling of the easily tearable stretched film according to claim 1,
The mixing ratio of Ny6 and MXD6 in the thermal history article, Ny6: MXD6 = 60 to 85 parts by weight: intralayer separation prevention method tearable stretched film, characterized in that from 15 to 40 parts by weight.
請求項1または請求項2に記載の易裂性延伸フィルムの層内剥離防止方法において、
当該易裂性延伸フィルムが複数層の少なくとも一層として易裂性ラミネートフィルムを形成していることを特徴とする易裂性延伸フィルムの層内剥離防止方法。
In the method for preventing in-layer peeling of the easily tearable stretched film according to claim 1 or 2 ,
A method for preventing in-layer peeling of an easily tearable stretched film, wherein the easily tearable stretched film forms an easily tearable laminate film as at least one of a plurality of layers .
請求項3に記載の易裂性延伸フィルムの層内剥離防止方法において、
前記易裂性ラミネートフィルムが易裂性袋を形成していることを特徴とする易裂性延伸フィルムの層内剥離防止方法。
In the method for preventing in-layer peeling of the easily tearable stretched film according to claim 3 ,
A method for preventing in-layer peeling of an easily tearable stretched film, wherein the easily tearable laminate film forms an easily tearable bag.
JP2006175776A 2005-06-27 2006-06-26 Method for preventing delamination of easily tearable stretched film Active JP5079268B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006175776A JP5079268B2 (en) 2005-06-27 2006-06-26 Method for preventing delamination of easily tearable stretched film

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2005187062 2005-06-27
JP2005187062 2005-06-27
JP2006175776A JP5079268B2 (en) 2005-06-27 2006-06-26 Method for preventing delamination of easily tearable stretched film

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP2012163837A Division JP5739383B2 (en) 2005-06-27 2012-07-24 Easy tear stretch film, easy tear laminate film, easy tear bag, and easy tear stretch film manufacturing method

Publications (2)

Publication Number Publication Date
JP2007039664A JP2007039664A (en) 2007-02-15
JP5079268B2 true JP5079268B2 (en) 2012-11-21

Family

ID=37797943

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006175776A Active JP5079268B2 (en) 2005-06-27 2006-06-26 Method for preventing delamination of easily tearable stretched film

Country Status (1)

Country Link
JP (1) JP5079268B2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2011096333A1 (en) * 2010-02-05 2013-06-10 出光ユニテック株式会社 Pillow packaging casing material and pillow packaging body
JP2013028660A (en) * 2011-07-26 2013-02-07 Idemitsu Unitech Co Ltd Method for producing easily tearable biaxially oriented nylon film and easily tearable biaxially oriented nylon film
JP2013136220A (en) * 2011-12-28 2013-07-11 Idemitsu Unitech Co Ltd Easy-to-tear laminated film and easy-to-tear packaging bag
JP2013188934A (en) * 2012-03-13 2013-09-26 Idemitsu Unitech Co Ltd Easily-tearable biaxially-stretched nylon film, easily-tearable laminate film, easily-tearable laminate packaging material, and manufacturing method for easily-tearable biaxially-stretched nylon film
JP2014151566A (en) * 2013-02-08 2014-08-25 Idemitsu Unitech Co Ltd Method for producing biaxially oriented film, biaxially oriented film, and laminated film
JP2014180798A (en) * 2013-03-19 2014-09-29 Idemitsu Unitech Co Ltd Method of manufacturing multilayer stretched film and multilayer stretched film

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3021854B2 (en) * 1991-02-28 2000-03-15 三菱化学株式会社 Polyamide laminated biaxially stretched film
JP2845684B2 (en) * 1991-10-31 1999-01-13 出光石油化学株式会社 Easy tearable laminate film and easy tearable bag using the same
JPH06155467A (en) * 1992-11-20 1994-06-03 Mitsubishi Kasei Corp Manufacture of polyamide molded piece
KR20050075366A (en) * 2002-10-24 2005-07-20 콜게이트-파아므올리브캄파니 Silicon modified polyamide material useful for oral care

Also Published As

Publication number Publication date
JP2007039664A (en) 2007-02-15

Similar Documents

Publication Publication Date Title
JP5079275B2 (en) Method for preventing delamination of easily tearable shrink film
JP5739383B2 (en) Easy tear stretch film, easy tear laminate film, easy tear bag, and easy tear stretch film manufacturing method
JP5079268B2 (en) Method for preventing delamination of easily tearable stretched film
JP6237644B2 (en) Wrap film
JP4243020B2 (en) Easy tear barrier laminate film, bag product using the same, and method for producing easy tear barrier film
KR20060136317A (en) Easy-split stretched film, easy-split laminated film, easy-split bag, and manufacturing method for easy-split stretched film
JP2010036938A (en) Wrapping material
JP2008045015A (en) Biaxially oriented nylon film, laminated packaging material and method for producing biaxially oriented nylon film
JP2008155527A (en) Laminate
JP2845684B2 (en) Easy tearable laminate film and easy tearable bag using the same
WO2013099698A1 (en) Easy-to-tear laminated film and easy-to-tear packaging bag
JP2845683B2 (en) Easy tearable laminate film and easy tearable bag using the same
JP2000079669A (en) Biaxially stretched multilayered film
JP5739384B2 (en) Easy tear film, easy tear laminate film, easy tear bag, and method for producing easy tear film
JP2014113789A (en) Method for producing multilayer stretched film and multilayer stretched film
JP2845680B2 (en) Easy tearable laminate film and easy tearable bag using the same
JP2661844B2 (en) Easy tearable laminate film and easy tearable bag using the same
WO2014148279A1 (en) Method for manufacturing multilayer stretched film, and multilayer stretched film
JP2845682B2 (en) Easy tearing film and method for producing the same
JP2013028660A (en) Method for producing easily tearable biaxially oriented nylon film and easily tearable biaxially oriented nylon film
JP2845685B2 (en) Tear-resistant laminate film
JP4825031B2 (en) Laminated film
JPH0699489A (en) Easy tearing laminated film and easy tearing bag using the same
JPH0948101A (en) Easy tearing laminated film, easy tearing bag and production thereof
JP3213184B2 (en) Easy tearable film and method for producing the same

Legal Events

Date Code Title Description
RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20070703

RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20070810

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20081216

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20110706

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20110712

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20110824

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20111108

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20120424

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20120724

A911 Transfer of reconsideration by examiner before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A911

Effective date: 20120803

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20120821

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20120829

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20150907

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Ref document number: 5079268

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150