JPH0321345B2 - - Google Patents
Info
- Publication number
- JPH0321345B2 JPH0321345B2 JP59240849A JP24084984A JPH0321345B2 JP H0321345 B2 JPH0321345 B2 JP H0321345B2 JP 59240849 A JP59240849 A JP 59240849A JP 24084984 A JP24084984 A JP 24084984A JP H0321345 B2 JPH0321345 B2 JP H0321345B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- bag
- density
- olefin copolymer
- film
- 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.)
- Expired - Lifetime
Links
- 238000004806 packaging method and process Methods 0.000 claims description 26
- 239000004711 α-olefin Substances 0.000 claims description 17
- 229920001684 low density polyethylene Polymers 0.000 claims description 16
- 239000004702 low-density polyethylene Substances 0.000 claims description 16
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 6
- 239000011342 resin composition Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 50
- 229920000092 linear low density polyethylene Polymers 0.000 description 12
- 239000004707 linear low-density polyethylene Substances 0.000 description 9
- 238000007789 sealing Methods 0.000 description 9
- 229920001903 high density polyethylene Polymers 0.000 description 6
- 239000004700 high-density polyethylene Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 239000003337 fertilizer Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 241000209140 Triticum Species 0.000 description 2
- 235000021307 Triticum Nutrition 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 1
- CRSBERNSMYQZNG-UHFFFAOYSA-N 1-dodecene Chemical compound CCCCCCCCCCC=C CRSBERNSMYQZNG-UHFFFAOYSA-N 0.000 description 1
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229920006262 high density polyethylene film Polymers 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Description
本発明は多層包装袋に関し、詳しくは特定の素
材からなり、剛性、低温耐衝撃強度等に優れ、表
面特性が良好な多層包装袋に関する。
従来、肥料、米、麦などの重量物包装用袋とし
ては、高密度ポリエチレン（HDPE）や低密度ポ
リエチレン（LDPE）などのフイルムが用いられ
ている。しかし、高圧法LDPEフイルムは機械的
強度が小さいため、厚肉としなければならない。
また、HDPEフイルムは引裂強度が十分でなく、
しかもシール性や突起物に対する強さに問題があ
ると共に外観やすべり性の点で好ましいものでな
かつた。これらの問題点を解決するため、これら
フイルムにゴム類を添加する方法が提案されてい
る。ゴム類を添加することによるフイルムのシー
ル性は向上するが、機会的強度や外観上の問題は
未だ十分に解消されず、包装袋としての用途には
不十分である。
このため、ポリエチレン製袋の問題点の解消や
特に省資源の立場からの薄肉化の要請に対して近
時種々の多層フイルム製袋が提案されている。例
えば、(1)外層がLDPE、内層がHDPEからなる
袋、(2)外層がHDPEこよび直鎖状低密度ポリエチ
レン（LLDPE）の混合物、内層がLDPEからな
る袋、(3)一方の外層がLDPE、中間層がHDPE、
他方の外層がLDPEからなる袋、(4)一方の外層が
LLDPE、中間層がHDPEおよびLLDPEの混合
物、他方の外層がLLDPEからなる袋などが提案
されている。しかしながら、(1)の袋では機械的強
度や外観上は特に支障はないが、シール性、パン
クチヤー強度、実用落下強度が十分でなく、(2)の
フイルムからなる袋では剛性が十分でなく自動包
装に適さず、しかも内層をLDPEとすると、シー
ル性が不足すると共に外観が劣つたものとなる。
また、(3)の袋は光学的性質に優れているが、パン
クチヤー強度や重量物包装においてシール性が不
足する。(4)の袋は数々の優れた特徴を有している
が、低温時の貯蔵や取扱いにおいての落下強度が
十分でなく、その使用分野が大巾に制限されてい
た。このように、未だ十分に満足し得る包装袋は
提案されていない。
そこで、本発明者は十分な強度、表面特性等を
有する包装袋を開発すべく鋭意研究した結果、特
定の素材よりなる多層包装袋が上記目的を達成し
うることを見い出し、この知見に基づいて本発明
を完成した。
すなわち本発明は、少なくとも二層のフイルム
からなる多層包装袋において、最外層（以下、(A)
層という。）が直鎖状エチレン−α−オレフイン
共重合体または該直鎖状エチレン−α−オレフイ
ン共重合体と高圧法低密度ポリエチレンとの混合
物からなる密度0.900ｇ／cm3以上0.940ｇ／cm3以下
のエチレン系共重合体よりなる層であり、内層
（以下、(B)層という。）が密度0.900ｇ／cm3以上
0.930ｇ／cm3未満の直鎖状エチレン−α−オレフ
イン共重合体（以下、（b1）成分という。）および
密度0.930ｇ／cm3以上0.945ｇ／cm3以下の直鎖状エ
チレン−α−オレフイン共重合体（以下、（b2）
成分という。）からなる樹脂組成物よりなる層で
あることを特徴とする多層包装袋である。
本発明の(A)層は袋の最外層を形成するものであ
つて、直鎖状エチレン−α−オレフイン共重合体
（LLDPE）または該直鎖状エチレン−α−オレフ
イン共重合体（LLDPE）と高圧法低密度ポリエ
チレン（LDPE）との混合物からなる密度0.900
ｇ／cm3以上0.940ｇ／cm3以下のエチレン系共重合
体よりなるものである。
ここで(A)層のエチレン系重合体のMIは0.1〜20
ｇ／10分、好ましくは0.2〜10ｇ／10分のものが
用いられる。
(A)層のエチレン系重合体の密度が0.900ｇ／cm3
未満であると、ブロツキングが生じ、また0.940
ｇ／cm3を越えると、すべりやすくなり、内容物包
装後の輸送貯蔵性、特に段積み性が悪くなり、さ
らに表面光沢も低くなるので好ましくない。
次に、上記最外層に積層される(B)層は密度
0.900ｇ／cm3以上0.930ｇ／cm3未満の直鎖状エチレ
ン−α−オレフイン共重合体（b1成分）および密
度0.930ｇ／cm3以上0.945ｇ／cm3以下の直鎖状エチ
レン−α−オレフイン共重合体（b2成分）からな
る樹脂組成物である。
ここで直鎖状エチレン−α−オレフイン共重合
体は通常、直鎖状低密度ポリエチレン（LLDPE）
と呼ばれる密度0.900〜0.945ｇ／cm3程度のもので
ある。このものは、エチレンとα−オレフインを
通常60〜200℃の低温、低・中圧力下にて共重合
させ、側鎖を導入して短鎖分岐構造を作り出すこ
とにより製造される。
本発明において上記（b1）成分および（b2）成
分の二種の低密度のLLDPE中のα−オレフイン
含量は通常１〜20重量％とすべきであり、この範
囲内において二種のLLDPEのα−オレフイン含
量を変えてもよいし、あるいは全く同一のものと
してもよい。
また、上記二種のLLDPEにおいて、エチレン
と共重合させるα−オレフインは同一のものを用
いてもよく、あるいは異なつたものを用いてもよ
い。α−オレフインとして炭素数３〜20個、好ま
しくは４〜15個のものが用いられ、具体的にはプ
ロピレン、ブテン−１、ペンテン−１、４−メチ
ルペンテン−１、ヘキセン−１、オクテン−１、
デセン−１、ドデセン−１等が挙げられる。
さらに、上記二種のLLDPEのMIは同一であつ
てもよいし、あるいは異なつていてもよいが、通
常0.1〜20ｇ／10分、好ましくは0.2〜10ｇ／10分
である。この二種のLLDPEは同質であるため、
極めて混練性が良く、均一に混合できる。
本発明において上記二成分のLLDPEの混合割
合は特に制限なく、目的とする袋の用途（使用温
度など）、サイズ、自動包装適性などを考慮して
決定すればよく、通常は（b1）成分90〜10重量
％、好ましくは85〜40重量％、（b2）成分10〜90
重量％、好ましくは15〜60重量％である。
本発明の内層は基本的には上記（b1）および
（b2）成分の二成分からなるが、必要により高圧
法LDPE、エチレン−酢酸ビニル共重合体等を添
加することができる。
本発明の多層包装袋は少なくとも上記(A)および
(B)層の二層のフイルムよりなるが、(B)層の配合組
成により成形時または袋とした時にブロツキング
しやすい場合などには必要により(B)層の内側に他
の層（以下、(C)層という。）を積層しても良い。
(C)層としては、シール性、耐ブロツキング性が優
れたものであれば良く、特に制限はない。通常は
前述の如きLDPE、LLDPEあるいは物性の異な
るLLDPEの混合物などが用いられる。
本発明の多層フイルムの積層方法は、Ｔ−ダイ
共押出法、インフレーシヨン高押出法などが挙げ
られ、特にインフレーシヨン共押出法が好適であ
る。この場合に、ブロー比は1.0〜5.0、好ましく
は1.6〜3.0である。
積層に際して各層の層比は袋の用途、袋のサイ
ズ、自動包装適性等により、適宜決定される。
(A)層および(B)層の二層よりなる場合は(A)層：(B)
層＝２〜80：98〜20、好ましくは２〜60：98〜40
である。(A)層の比が２未満になると、落袋強度、
特に低温時の落袋強度が低下するとともに、表面
特性も悪化するので好ましくない。また、(A)層の
比が60を越えると、フイルムの腰の低下が目立ち
自動充填適性が低下し、実用的でない。
また、(A)層、(B)層および(C)層の三層よりなる場
合は(A)層：(B)層：(C)層＝２〜60：10〜70：２〜
60、好ましくは２〜50：20〜50：２〜50である。
ここで、(B)層の比が10未満になると、フイルムの
腰の低下が目立ち、自動充填適性が低下し、また
(B)層の比が70を越えると、落袋特性、特に低温時
の落袋強度が低下し、好ましくない。
本発明において多層フイルムの厚さは用途等を
考慮して決めればよいが、通常は10〜300μ、好
ましくは20〜200μ程度が好適である。
このようにして得られるフイルムより(A)層を最
外層とする多層包装袋が得られる。製袋方法は常
法でよく、例えば筒状フイルムを製造した後、底
部をヒートシールする方法が好ましい。
本発明の多層包装袋は強度が高く、そのため薄
肉化することができ、省資源の立場から有利であ
る。また、低温耐衝撃強度が高く、実用低温落下
特性も良好である。さらに、表面特性にも優れて
おり、内面においてシール性、耐ブロツキング性
が良好であり、外面においては光沢、耐すべり性
が優れている。しかも、剛性が良好であるため、
包装適性が良好で、特に自動包装が好適である。
このように本発明の多層包装袋は包装袋、特に
肥料、米、麦などの重量物包装用袋として極めて
有用である。
次に、本発明を実施例により詳しく説明する。
実施例１〜７および比較例１、２
多層フイルムの各々の層を構成する第１表に示
す所定の原料樹脂を40mmφの押出機を２台あるい
は３台用いてそれぞれ溶融混練し、ダイ内接着型
サーキユラーダイいダイ径200mmφ、リツプ間隙
２mm、ダイ温度180℃）に導入して押出し、ブロ
ー比1.7にてインフレーシヨン成形して140μの多
層フイルムを得た。このようにして得られた多層
フイルムの各種物性試験などの評価結果を第１表
に示す。この多層筒状フイルムをボトムシール
（シール温度180℃）して包装用袋を得た。
なお、試験法は次の方法に準拠した。
(1) 引張特性 JIS Ｚ 1702
(2) 引裂強度 JIS Ｚ 1702
(3) パンクチヤー強度 JIS Ｐ 8134
(4) ヒートシール強さ JIS Ｚ 1707
(5) 低温落下試験
400mm×660mmの袋に化成肥料20Kgを充填し、
200℃でヒートシールした後、所定の試験温度で
10時間養生した後、1.2ｍの高さより横方向に左
右５回ずつ落下させ、破袋の状況を観察した。そ
の試験結果を無破袋率として第１表に示した。
比較例３
実施例１において、原料として高圧法LDPEの
みを用いたこと以外は実施例１と同様にして厚さ
200μの単層のフイルムを得た。評価結果を第１
表に示す。
The present invention relates to a multilayer packaging bag, and more particularly to a multilayer packaging bag that is made of a specific material, has excellent rigidity, low-temperature impact strength, etc., and has good surface properties. Conventionally, films such as high-density polyethylene (HDPE) and low-density polyethylene (LDPE) have been used as bags for packaging heavy items such as fertilizer, rice, and wheat. However, high-pressure LDPE film has low mechanical strength, so it must be thick.
Also, HDPE film does not have sufficient tear strength,
Furthermore, there were problems in sealing performance and strength against protrusions, and the material was not desirable in terms of appearance and slipperiness. In order to solve these problems, methods have been proposed in which rubbers are added to these films. Although the sealing properties of the film are improved by adding rubber, the problems with mechanical strength and appearance have not yet been sufficiently resolved, and the film is not suitable for use as a packaging bag. For this reason, various multilayer film bags have recently been proposed to solve the problem of making polyethylene bags and to reduce the wall thickness, especially from the standpoint of resource conservation. For example, (1) a bag in which the outer layer is LDPE and the inner layer is HDPE, (2) a bag in which the outer layer is a mixture of HDPE and linear low-density polyethylene (LLDPE), and the inner layer is LDPE, (3) one outer layer is LDPE, middle layer is HDPE,
(4) A bag with the other outer layer made of LDPE; (4) one outer layer made of LDPE;
Bags have been proposed in which the middle layer is a mixture of HDPE and LLDPE, and the other outer layer is LLDPE. However, although the bag in (1) has no particular problems in terms of mechanical strength or appearance, it does not have sufficient sealing performance, puncture strength, or practical drop strength, and the bag made of film in (2) does not have sufficient rigidity and is It is not suitable for packaging, and if the inner layer is made of LDPE, the sealing performance will be insufficient and the appearance will be inferior.
Furthermore, although the bag (3) has excellent optical properties, it lacks puncture strength and sealing performance when packaging heavy items. Although the bag (4) has a number of excellent features, it does not have sufficient drop strength during storage and handling at low temperatures, and its field of use is severely limited. As described above, a fully satisfactory packaging bag has not yet been proposed. Therefore, as a result of intensive research to develop a packaging bag with sufficient strength, surface characteristics, etc., the present inventor discovered that a multilayer packaging bag made of a specific material could achieve the above objectives, and based on this knowledge, The invention has been completed. That is, the present invention provides a multilayer packaging bag consisting of at least two layers of film, in which the outermost layer (hereinafter referred to as (A)
It's called a layer. ) is a linear ethylene-α-olefin copolymer or a mixture of the linear ethylene-α-olefin copolymer and high-pressure low-density polyethylene with a density of 0.900 g/cm 3 or more and 0.940 g/cm 3 or less The inner layer (hereinafter referred to as (B) layer) has a density of 0.900 g/cm 3 or more.
A linear ethylene-α-olefin copolymer with a density of less than 0.930 g/cm 3 (hereinafter referred to as component (b 1 )) and a linear ethylene-α with a density of 0.930 g/cm 3 or more and 0.945 g/cm 3 or less -Olefin copolymer (hereinafter referred to as (b 2 ))
It is called an ingredient. This is a multilayer packaging bag characterized by a layer made of a resin composition consisting of: The layer (A) of the present invention forms the outermost layer of the bag, and is made of linear ethylene-α-olefin copolymer (LLDPE) or the linear ethylene-α-olefin copolymer (LLDPE). and high-pressure low density polyethylene (LDPE) with a density of 0.900
It is made of an ethylene copolymer with an amount of g/cm 3 or more and 0.940 g/cm 3 or less. Here, the MI of the ethylene polymer in layer (A) is 0.1 to 20.
g/10 minutes, preferably 0.2 to 10 g/10 minutes. The density of the ethylene polymer in the (A) layer is 0.900g/cm 3
If it is less than 0.940, blocking will occur and
If it exceeds g/cm 3 , it becomes slippery, the transportation and storage properties after packaging the contents, particularly the stacking properties, and the surface gloss becomes low, which is not preferable. Next, layer (B) laminated on the outermost layer has a density
Linear ethylene-α-olefin copolymer (b 1 component) with a density of 0.900 g/cm 3 or more and less than 0.930 g/cm 3 and linear ethylene-α with a density of 0.930 g/cm 3 or more and 0.945 g/cm 3 or less - A resin composition consisting of an olefin copolymer (b 2 components). Here, the linear ethylene-α-olefin copolymer is usually linear low-density polyethylene (LLDPE).
It has a density of about 0.900 to 0.945 g/cm 3 . This product is produced by copolymerizing ethylene and α-olefin at a low temperature, usually 60 to 200°C, under low to medium pressure, and introducing side chains to create a short chain branched structure. In the present invention, the α-olefin content in the two low-density LLDPEs, component (b 1 ) and component (b 2 ), should normally be 1 to 20% by weight, and within this range, the content of the two types of LLDPE The α-olefin content of the two may be varied or may be exactly the same. Further, in the above two types of LLDPE, the same α-olefin to be copolymerized with ethylene may be used, or different α-olefins may be used. As the α-olefin, those having 3 to 20 carbon atoms, preferably 4 to 15 carbon atoms are used, and specifically, propylene, butene-1, pentene-1, 4-methylpentene-1, hexene-1, octene-1 1,
Examples include decene-1 and dodecene-1. Further, the MI of the above two types of LLDPEs may be the same or different, but is usually 0.1 to 20 g/10 minutes, preferably 0.2 to 10 g/10 minutes. Since these two types of LLDPE are of the same quality,
It has extremely good kneading properties and can be mixed uniformly. In the present invention, the mixing ratio of the above-mentioned two components LLDPE is not particularly limited and may be determined by taking into account the intended use of the bag (use temperature, etc.), size, suitability for automatic packaging, etc. Usually, the (b 1 ) component 90-10% by weight, preferably 85-40% by weight, ( b2 ) component 10-90
% by weight, preferably 15-60% by weight. The inner layer of the present invention basically consists of the above two components (b 1 ) and (b 2 ), but high-pressure LDPE, ethylene-vinyl acetate copolymer, etc. can be added if necessary. The multilayer packaging bag of the present invention has at least the above (A) and
The film consists of two layers (B), but if the composition of the (B) layer tends to cause blocking when molded or made into a bag, another layer (hereinafter referred to as (C) layer) may be laminated.
The layer (C) is not particularly limited as long as it has excellent sealing properties and anti-blocking properties. Generally, LDPE, LLDPE, or a mixture of LLDPEs having different physical properties as described above are used. Examples of the method for laminating the multilayer film of the present invention include T-die coextrusion and inflation high extrusion, with inflation coextrusion being particularly preferred. In this case, the blow ratio is between 1.0 and 5.0, preferably between 1.6 and 3.0. During lamination, the layer ratio of each layer is appropriately determined depending on the purpose of the bag, the size of the bag, suitability for automatic packaging, etc. If it consists of two layers: (A) layer and (B) layer, (A) layer: (B)
Layer = 2-80:98-20, preferably 2-60:98-40
It is. (A) When the layer ratio is less than 2, the drop bag strength
Particularly, this is not preferable because the drop bag strength at low temperatures is reduced and the surface properties are also deteriorated. Furthermore, if the ratio of layer (A) exceeds 60, the stiffness of the film will be noticeably lowered and the suitability for automatic filling will be lowered, making it impractical. In addition, if it consists of three layers (A) layer, (B) layer and (C) layer, (A) layer: (B) layer: (C) layer = 2 ~ 60: 10 ~ 70: 2 ~
60, preferably 2-50:20-50:2-50.
Here, if the ratio of layer (B) is less than 10, the stiffness of the film will be noticeable, the suitability for automatic filling will be reduced, and
If the ratio of layer (B) exceeds 70, the drop bag properties, especially the drop bag strength at low temperatures, will deteriorate, which is undesirable. In the present invention, the thickness of the multilayer film may be determined in consideration of the intended use, but it is usually about 10 to 300 microns, preferably about 20 to 200 microns. A multilayer packaging bag having layer (A) as the outermost layer is obtained from the film thus obtained. The bag may be manufactured by any conventional method, and preferably, for example, a method in which a cylindrical film is manufactured and then the bottom is heat-sealed. The multilayer packaging bag of the present invention has high strength and can therefore be made thinner, which is advantageous from the standpoint of resource saving. It also has high low-temperature impact strength and good practical low-temperature drop characteristics. Furthermore, it has excellent surface properties, with good sealing properties and blocking resistance on the inner surface, and excellent gloss and slip resistance on the outer surface. Moreover, since the rigidity is good,
It has good packaging suitability, and is particularly suitable for automatic packaging. As described above, the multilayer packaging bag of the present invention is extremely useful as a packaging bag, especially as a bag for packaging heavy items such as fertilizer, rice, and wheat. Next, the present invention will be explained in detail with reference to examples. Examples 1 to 7 and Comparative Examples 1 and 2 Predetermined raw material resins shown in Table 1 constituting each layer of the multilayer film were melt-kneaded using two or three 40 mmφ extruders, and bonded in the die. It was introduced into a circular die (die diameter 200 mmφ, lip gap 2 mm, die temperature 180°C) and extruded, and inflation molded at a blow ratio of 1.7 to obtain a 140 μm multilayer film. Table 1 shows the evaluation results of various physical property tests of the multilayer film thus obtained. This multilayer cylindrical film was bottom-sealed (sealing temperature 180°C) to obtain a packaging bag. The test method was based on the following method. (1) Tensile properties JIS Z 1702 (2) Tear strength JIS Z 1702 (3) Puncture strength JIS P 8134 (4) Heat seal strength JIS Z 1707 (5) Low temperature drop test 20 kg of chemical fertilizer in a 400 mm x 660 mm bag Fill and
After heat sealing at 200℃, at the specified test temperature
After curing for 10 hours, the bag was dropped horizontally from a height of 1.2 m five times on each side, and the state of bag breakage was observed. The test results are shown in Table 1 as the percentage of unbroken bags. Comparative Example 3 The thickness was determined in the same manner as in Example 1 except that only high-pressure LDPE was used as the raw material.
A 200μ monolayer film was obtained. Evaluation results first
Shown in the table.
【表】【table】
Claims (1)
袋において、最外層(A)が直鎖状エチレン−α−オ
レフイン共重合体または該直鎖状エチレン−α−
オレフイン共重合体と高圧法低密度ポリエチレン
との混合物からなる密度0.900ｇ／cm3以上0.940
ｇ／cm3以下のエチレン系重合体よりなる層であ
り、内層(B)が密度0.900ｇ／cm3以上0.930ｇ／cm3未
満の直鎖状エチレン−α−オレフイン共重合体お
よび密度0.930ｇ／cm3以上0.945ｇ／cm3以下の直鎖
状エチレン−α−オレフイン共重合体からなる樹
脂組成物よりなる層であることを特徴とする多層
包装袋。 ２ 最外層(A)および内層(B)の層比が最外層(A)：内
層(B)＝２〜80：98〜20である特許請求の範囲第１
項記載の多層包装袋。[Claims] 1. A multilayer packaging bag consisting of at least two layers of film, in which the outermost layer (A) is a linear ethylene-α-olefin copolymer or the linear ethylene-α-olefin copolymer.
Consisting of a mixture of olefin copolymer and high-pressure low-density polyethylene, density 0.900 g/cm 3 or more 0.940
g/cm 3 or less, and the inner layer (B) is a linear ethylene-α-olefin copolymer with a density of 0.900 g/cm 3 or more and less than 0.930 g/cm 3 and a density of 0.930 g. 1. A multilayer packaging bag characterized in that the layer is made of a resin composition comprising a linear ethylene-α-olefin copolymer having a weight of 0.945 g/cm 3 or more and 0.945 g/cm 3 or less. 2 Claim 1 in which the layer ratio of the outermost layer (A) and the inner layer (B) is outermost layer (A):inner layer (B) = 2-80:98-20
Multi-layer packaging bag as described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24084984A JPS61120745A (en) | 1984-11-16 | 1984-11-16 | Multilayer packaging bag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24084984A JPS61120745A (en) | 1984-11-16 | 1984-11-16 | Multilayer packaging bag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61120745A JPS61120745A (en) | 1986-06-07 |
| JPH0321345B2 true JPH0321345B2 (en) | 1991-03-22 |
Family
ID=17065621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24084984A Granted JPS61120745A (en) | 1984-11-16 | 1984-11-16 | Multilayer packaging bag |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61120745A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3528343B2 (en) * | 1995-07-12 | 2004-05-17 | 住友化学工業株式会社 | Multilayer film |
| JP7310445B2 (en) * | 2018-09-12 | 2023-07-19 | 東ソー株式会社 | Polyethylene resin composition, laminate and medical container |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5926259A (en) * | 1982-05-20 | 1984-02-10 | スティックサック・エスティ−エス・ソシエテ・アノニム | Plastic film and bag and large-sized bag |
-
1984
- 1984-11-16 JP JP24084984A patent/JPS61120745A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5926259A (en) * | 1982-05-20 | 1984-02-10 | スティックサック・エスティ−エス・ソシエテ・アノニム | Plastic film and bag and large-sized bag |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61120745A (en) | 1986-06-07 |
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