JPH05229079A - Easy tear film and production thereof - Google Patents

Easy tear film and production thereof

Info

Publication number
JPH05229079A
JPH05229079A JP4037964A JP3796492A JPH05229079A JP H05229079 A JPH05229079 A JP H05229079A JP 4037964 A JP4037964 A JP 4037964A JP 3796492 A JP3796492 A JP 3796492A JP H05229079 A JPH05229079 A JP H05229079A
Authority
JP
Japan
Prior art keywords
film
draw ratio
density polyethylene
layer
minutes
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.)
Granted
Application number
JP4037964A
Other languages
Japanese (ja)
Other versions
JP2665426B2 (en
Inventor
Eiji Maemura
英治 前村
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 Petrochemical Co Ltd
Original Assignee
Idemitsu Petrochemical 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 Petrochemical Co Ltd filed Critical Idemitsu Petrochemical Co Ltd
Priority to JP4037964A priority Critical patent/JP2665426B2/en
Publication of JPH05229079A publication Critical patent/JPH05229079A/en
Application granted granted Critical
Publication of JP2665426B2 publication Critical patent/JP2665426B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Bag Frames (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To obtain a film excellent in easy tear properties and heat sealability by prescribing a draw ratio at the time of the molding of the film in a laminated film consisting of a specific high density polyethylene layer and a layer composed of straight chain low density polyethylene due to specific copolymerization. CONSTITUTION:A laminated film contains a layer composed of high density polyethylene with M1=0.02-20g/10min and d=0.940-0.970g/cm<2> and a layer composed of straight chain low density polyethylene due to copolymerization of ethylene and 1-butene with M1=0.1-30g/10min and d=0.900-0.945g/cm<2>. Herein, the draw ratio of the film at the time of molding is set to 5-50. When the draw ratio is below 5, slight tear properties are obtained but no satisfactory tear properties are obtained. When the draw ratio exceeds 50, tear properties become well but the physical, properties of the film such as impact resistance lower.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、引裂きが容易な易裂性
フィルム及びその製造方法に関し、例えば食品、薬品等
の包装袋用基材フィルムとして利用することができる。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easily tearable film which is easy to tear and a method for producing the same, and can be used as a base film for packaging bags for foods, medicines and the like.

【0002】[0002]

【背景技術】食品、薬品等の包装袋用フィルムとして、
ラミネートフィルムが用いられている。このようなラミ
ネートフィルムは、内層となる基材フィルム(シーラン
トフィルム)に各種のフィルムが積層されて構成されて
いる。前記基材フィルムとしては、機械的強度やシール
性能が優れているため、主としてL−LDPEが使用さ
れている。このL−LDPEの具体例として、コモノマ
ーがC4系、C6系、C8系等のL−LDPEがある。
このC6とは、例えば4−メチル−1−ペンテン、C8
とは、例えば1−オクテンである。
BACKGROUND ART As a film for packaging bags for foods, medicines, etc.,
A laminated film is used. Such a laminated film is configured by laminating various films on a base film (sealant film) which is an inner layer. As the base film, L-LDPE is mainly used because it has excellent mechanical strength and sealing performance. Specific examples of the L-LDPE include L-LDPE in which the comonomer is C4 type, C6 type, C8 type or the like.
This C6 is, for example, 4-methyl-1-pentene, C8
Is, for example, 1-octene.

【0003】[0003]

【発明が解決しようとする課題】前記C6系、C8系の
L−LDPEフィルムは、フィルムの伸びが大きいた
め、引裂き性が極めて悪いという問題点がある。そこ
で、フィルム成形時のドラフト比を大きくして引裂き性
を改良することも試みられているが、依然として引裂き
性は不良である。また、フィルムを一軸延伸する方法も
提案されているが、満足すべき引裂き性は得られず、逆
にヒートシール性能が悪化している。
The C6 type and C8 type L-LDPE films have a problem that the tearability is extremely poor because of the large elongation of the film. Therefore, attempts have been made to improve the tearability by increasing the draft ratio during film formation, but the tearability is still poor. A method of uniaxially stretching a film has also been proposed, but satisfactory tearability is not obtained, and conversely, heat seal performance is deteriorated.

【0004】前記C4系のL−LDPEフィルムは、フ
ィルム成形時のドラフト比を大きくすることにより、引
裂き性についてはかなり改善できるが、直線カット性が
劣っている。また、一軸延伸することによっても、引裂
き性についてはかなり改善できるが、直線カット性がな
く、しかもヒートシール性能も悪化する。
The C4 type L-LDPE film can be considerably improved in tearability by increasing the draft ratio at the time of film formation, but is inferior in linear cutability. Also, uniaxially stretching can considerably improve the tearability, but it does not have the linear cutability, and the heat seal performance is deteriorated.

【0005】一方、包装袋にVカットやノッチのような
切り込みを形成して引裂きを容易にすることも提案され
ているが、依然として開封が困難であるため、鋏や包丁
を使用せざるを得ない状況にある。そこで、本発明は、
易裂性が優れ、かつヒートシール性能にも優れた易裂性
フィルム及びその製造方法を提供することを目的とす
る。
On the other hand, it has been proposed to form a notch such as a V-cut or notch on the packaging bag to facilitate tearing, but since it is still difficult to open the bag, it is necessary to use scissors or a kitchen knife. There is no situation. Therefore, the present invention is
An object of the present invention is to provide an easily tearable film having excellent easy tearability and also excellent heat sealing performance, and a method for producing the same.

【0006】[0006]

【課題を解決するための手段及び作用】本発明に係る易
裂性フィルムは、高密度ポリエチレン(HDPEと略
す、MI=0.02〜20g/10分、d=0.940 〜0.970g/ c
m3 )より成る層と、エチレンと1−ブテンとの共重合
による直鎖状低密度ポリエチレン(C4系LLと略す、
MI=0.1 〜30g/10分、d=0.900 〜0.945g/ cm3 )よ
り成る層とを含む積層フィルムであって、フィルム成形
時におけるドロー比が5〜50のものである。この易裂性
フィルムは、例えば包装袋用基材フィルムとして使用し
た場合、HDPEより成る層が外層(非シール層)とな
り、C4系LLより成る層が内層(シール層)となる。
The easily tearable film according to the present invention comprises a high density polyethylene (abbreviated as HDPE, MI = 0.02 to 20 g / 10 minutes, d = 0.940 to 0.970 g / c).
m 3 ), and a linear low-density polyethylene (abbreviated as C4 type LL) obtained by copolymerizing ethylene and 1-butene.
A laminate film comprising a layer having MI = 0.1 to 30 g / 10 minutes and d = 0.900 to 0.945 g / cm 3 ) and having a draw ratio of 5 to 50 when the film is formed. When this easily tearable film is used as a base film for a packaging bag, for example, the layer made of HDPE becomes the outer layer (non-sealing layer) and the layer made of C4 series LL becomes the inner layer (sealing layer).

【0007】前記HDPEより成る層は、積層フィルム
中に1層又は2層以上含んでいてもよい。前記HDPE
のMI(メルトインデックス)は、0.02〜20g/10分、好
ましくは高強度のフィルムを得るため0.02〜10g/10分と
するが、0.02g/10分より小さいと、溶融粘度が高くなり
すぎて、押出しが困難となり、20g/10分より大きいと、
フィルム物性が低下する。
The above-mentioned layer made of HDPE may be contained in the laminated film in one layer or in two or more layers. The HDPE
MI (melt index) is 0.02 to 20 g / 10 minutes, preferably 0.02 to 10 g / 10 minutes to obtain a high-strength film, but if it is less than 0.02 g / 10 minutes, the melt viscosity becomes too high. , It becomes difficult to extrude, and if it is larger than 20 g / 10 minutes,
The physical properties of the film deteriorate.

【0008】また、HDPEのd(密度)は、0.940 〜
0.970g/ cm3 、好ましくは0.940 〜0.960g/ cm3 とする
が、0.940g/ cm3 より小さいと、易裂性が不充分とな
り、0.970g/ cm3 より大きいと、フィルム物性が低下す
る。前記C4系LLのMIは、0.1 〜30g/10分、好まし
くは高強度のフィルムを得るため0.1 〜10g/10分とする
が、0.1 g/10分より小さいと、溶融粘度が高くなりすぎ
て、押出し適性が悪くなり、30g/10分より大きいと、フ
ィルム物性が低下する。
The d (density) of HDPE is 0.940-
0.970 g / cm 3, preferably between 0.940 ~0.960g / cm 3, but the smaller 0.940 g / cm 3, becomes insufficient tearable, larger than 0.970 g / cm 3, the film physical properties is reduced .. The MI of the C4 type LL is 0.1 to 30 g / 10 minutes, preferably 0.1 to 10 g / 10 minutes to obtain a high-strength film, but if it is less than 0.1 g / 10 minutes, the melt viscosity becomes too high. Extrusion suitability deteriorates, and if it exceeds 30 g / 10 minutes, the physical properties of the film deteriorate.

【0009】また、C4系LLのdは、0.900 〜0.940g
/ cm3 、好ましくは良好なヒートシール性を得るため0.
900 〜0.930g/ cm3 とするが、0.900g/ cm3 より小さい
と、結晶化度が低くなりすぎて、フィルムとして実用上
使用できなくなる。一方、0.945g/ cm 3より大きいと、
HDPEに近い特性を示し、L−LDPEの有するシー
ル性能とフィルム物性が損なわれる。そして、フィルム
成形時におけるドロー比を5〜50とするが、5未満の場
合には多少の引裂き性は得られるものの、満足すべき引
裂き性ではない。また、50を越えると、引裂き性は良好
になるが、フィルムインパクト等のフィルム物性が低下
する。
The d of C4 type LL is 0.900 to 0.940 g.
/ cm 3 , preferably 0 for good heat sealability.
It is set to 900 to 0.930 g / cm 3 , but if it is less than 0.900 g / cm 3 , the crystallinity becomes too low to be practically usable as a film. On the other hand, if it is larger than 0.945 g / cm 3 ,
It exhibits properties close to those of HDPE and impairs the sealing performance and film properties of L-LDPE. The draw ratio at the time of film formation is set to 5 to 50. When the draw ratio is less than 5, some tearability is obtained, but the tearability is not satisfactory. On the other hand, when it exceeds 50, the tearability is improved, but the film physical properties such as film impact are deteriorated.

【0010】なお、ドロー比は、吐出量から求められる
ダイス出口での線速度(溶融樹脂のMD(移動方向)へ
の線速度) v0 と、フィルムの引取り速度 v1 との比
( v1/ v0 )によって得られる。次に、この易裂性フ
ィルムの製造方法は、前記HDPEより成る層と、前記
C4系LLより成る層とを含む積層フィルムを共押出し
成形し、このフィルム成形時のドロー比を5〜50とした
ことを特徴とする。前記共押出し成形は、具体的には多
層共押出しインフレーション成形又は多層共押出しTダ
イ成形によって行うことができる。
The draw ratio is the ratio of the linear velocity at the die outlet (the linear velocity in the MD (moving direction) of the molten resin) v 0 obtained from the discharge amount to the film take-up velocity v 1 (v 1 / v 0 ). Next, this easily tearable film is produced by co-extruding a laminated film containing the layer made of the HDPE and the layer made of the C4 type LL, and the draw ratio at the time of forming the film is set to 5 to 50. It is characterized by having done. Specifically, the coextrusion molding can be performed by multilayer coextrusion inflation molding or multilayer coextrusion T-die molding.

【0011】[0011]

【実施例】実施例1〜11 3層共押出しインフレーション成形機(ダイス径200mm
、リップ開度1mm)を使用して、外層(非シール
層)、中間層及び内層(シール層)より成る3層の易裂
性フィルムを製造した。但し、各実施例において、使用
した外層、中間層、内層用の原料及びフィルム成形時の
ドロー比( v1 / v0 )は、下記の表1に示す通りであ
る。
[Examples] Examples 1 to 11 Three-layer coextrusion inflation molding machine (die diameter 200 mm
, Lip opening 1 mm), a three-layer easily tearable film including an outer layer (non-sealing layer), an intermediate layer and an inner layer (sealing layer) was produced. However, in each example, the raw materials for the outer layer, the intermediate layer, and the inner layer used, and the draw ratio (v 1 / v 0 ) at the time of film formation are as shown in Table 1 below.

【0012】ここで、表に記載した各原料の物性と商品
名を下記に示す。 HDPE…MI=0.02、d=0.954 (三菱ポリエチレ
ン R4000F) HDPE…MI=1.0 、d=0.954 (出光ポリエチレ
ン 400 M) HDPE…MI=9.0 、d=0.957 (三井石化ポリエ
チレン 2100JH) HDPE…MI=19.0、d=0.956 (出光ポリエチレ
ン 120 J)
The physical properties and trade names of each raw material listed in the table are shown below. HDPE ... MI = 0.02, d = 0.954 (Mitsubishi Polyethylene R4000F) HDPE ... MI = 1.0, d = 0.954 (Idemitsu Polyethylene 400 M) HDPE ... MI = 9.0, d = 0.957 (Mitsui Polyethylene 2100JH) HDPE ... MI = 19.0, d = 0.956 (Idemitsu Polyethylene 120 J)

【0013】C4系LL…MI=1.1 、d=0.921
(出光ポリエチレン−L 0134M) C4系LL…MI=7.0 、d=0.928 (出光ポリエチ
レン−L 1054D) C4系LL…MI=7.0 、d=0.943 (出光ポリエチ
レン−L 0684R) C4系LL…MI=20.0、d=0.925 (出光ポリエチ
レン−L 2044D) C6系LL…MI=2.1 、d=0.920 (三井石化ウル
トゼックス 2020L) C8系LL…MI=2.0 、d=0.920 (出光モアテッ
ク 0238CL)
C4 system LL ... MI = 1.1, d = 0.921
(Idemitsu Polyethylene-L 0134M) C4 series LL ... MI = 7.0, d = 0.928 (Idemitsu Polyethylene-L 1054D) C4 series LL ... MI = 7.0, d = 0.943 (Idemitsu Polyethylene-L 0684R) C4 series LL ... MI = 20.0 , D = 0.925 (Idemitsu Polyethylene-L 2044D) C6 series LL ... MI = 2.1, d = 0.920 (Mitsui Petrochemical Ultzex 2020L) C8 series LL ... MI = 2.0, d = 0.920 (Idemitsu Moretec 0238CL)

【0014】次に、各実施例で得られた易裂性フィルム
について、エレメンドルフ引裂き強度E(kg/cm )、易
裂性の度合い、引裂き時のフィルム間隔の誤差α
(%)、直線カット性の度合い、フィルムインパクト強
度(kg・cm/cm )及びシール強度(kg/15cm幅)をそれ
ぞれ測定、評価した結果を表1〜3に示す。また、各実
施例の総合評価も併せて示す。前記易裂性の度合いは、
フィルムのMD方向のエレメンドルフ引裂き強度の値E
について、E≦10kg/cm を○、10<E<30を△、E≧30
kg/cm を×として評価したものである。
Next, with respect to the easily tearable films obtained in each of the examples, the Elemendorff tear strength E (kg / cm 2), the degree of easy tearability, and the error α of the film interval at the time of tearing
(%), Degree of linear cuttability, film impact strength (kg · cm / cm 2), and seal strength (kg / 15 cm width) were measured and evaluated. In addition, the comprehensive evaluation of each example is also shown. The degree of easy tearing is
The value E of the Elemendorff tear strength in the MD direction of the film
, E ≦ 10 kg / cm is ○, 10 <E <30 is △, E ≧ 30
It is evaluated by setting kg / cm as x.

【0015】前記直線カット性の度合いは、20cm幅のフ
ィルムに所定間隔Ws (2cm)で切れ目を入れ、これら
の切れ目に沿ってフィルムを引裂いた後、引裂かれた後
の他端の幅We を測定し、元の間隔Ws との誤差αを次
のように求め、このαにより評価した。 α=〔(Ws −We )/Ws 〕×100 そして、α≦20%を○、20%<α<40%を△、α≧40%
を×とした。
The degree of the straight line cutting property is as follows. A film having a width of 20 cm is cut at predetermined intervals Ws (2 cm), the film is torn along these cuts, and the width We of the other end after being torn is determined. The measurement was performed, the error α from the original interval Ws was obtained as follows, and the evaluation was made by this α. α = [(Ws-We) / Ws] × 100 And α ≦ 20% is ○, 20% <α <40% is △, α ≧ 40%
Was designated as x.

【0016】前記フィルムインパクト強度は、フィルム
インパクトテスター〔MODEL IP-1(商品名)、東洋精機
製作所株式会社製〕を使用し、1000kg・cm/cm 以上を
○、1000kg・cm/cm 未満を×と評価した。なお、1000kg
・cm/cm 未満では、フィルム強度が低いため、包装材料
としての実用性に劣る。
For the film impact strength, a film impact tester [MODEL IP-1 (trade name), manufactured by Toyo Seiki Seisakusho Co., Ltd.] was used, and 1000 kg · cm / cm or more was ○, and less than 1000 kg · cm / cm was ×. Was evaluated. 1000kg
・ If it is less than cm / cm 2, the film strength is low, so that it is not practical as a packaging material.

【0017】前記シール強度は、二軸延伸ナイロンフィ
ルム(ONy) と、HDPE及びLL系の基材フィルムとを
ドライラミネートし、2kg/cm2 、1秒でヒートシール
したものの強度を測定した。そして、4kg/15cm幅以上
のものを○、4kg/15cm幅未満のものを×と評価した。
ここで使用したONy は、出光ユニロン(商品名)G-100
(グレード名)であり、ドライラミネート用接着剤は2
液性のAD-308A,AD-308B (商品名、東洋モートン株式会
社製)である。なお、4kg/15cm幅未満では、シール性
能としては低いレベルであり、包装材料としての実用性
に劣る。
The sealing strength was measured by dry laminating a biaxially stretched nylon film (ONy) and a HDPE and LL base film and heat-sealing at 2 kg / cm 2 for 1 second. And, those having a width of 4 kg / 15 cm or more were evaluated as ○, and those having a width of less than 4 kg / 15 cm were evaluated as ×.
The ONy used here is Idemitsu Unilon (trade name) G-100.
(Grade name) and the adhesive for dry lamination is 2
Liquid AD-308A, AD-308B (trade name, manufactured by Toyo Morton Co., Ltd.). If the width is less than 4 kg / 15 cm, the sealing performance is low and the packaging material is not practical.

【0018】[0018]

【表1】 [Table 1]

【0019】[0019]

【表2】 [Table 2]

【0020】[0020]

【表3】 [Table 3]

【0021】比較例1〜18 上記実施例と同様にして各比較例に係る3層フィルムを
製造した。但し、各比較例において、使用した外層、中
間層、内層用の原料及びフィルム成形時のドロー比( v
1 / v0 )は、下記の表4に示す通りである。次に、実
施例と同様にして、各比較例で得られたフィルムについ
て、エレメンドルフ引裂き強度E、易裂性の度合い、引
裂き時のフィルム間隔の誤差α、直線カット性の度合
い、フィルムインパクト強度及びシール強度を測定、評
価した結果を表4〜6に示す。また、各比較例の総合評
価も併せて示す。
Comparative Examples 1 to 18 Three-layer films according to comparative examples were produced in the same manner as in the above examples. However, in each comparative example, the raw materials for the outer layer, the intermediate layer, and the inner layer used and the draw ratio (v
1 / v 0 ) is as shown in Table 4 below. Next, in the same manner as in the examples, for the films obtained in the respective comparative examples, the Elemendorf tear strength E, the degree of easy tearability, the film spacing error α at the time of tearing, the degree of linear cuttability, the film impact strength Also, the results of measuring and evaluating the seal strength are shown in Tables 4 to 6. The comprehensive evaluation of each comparative example is also shown.

【0022】[0022]

【表4】 [Table 4]

【0023】[0023]

【表5】 [Table 5]

【0024】[0024]

【表6】 [Table 6]

【0025】実施例及び比較例の考察 実施例1〜11に係る易裂性フィルムによれば、いずれも
外層と中間層がHDPE(MI=0.02〜20g/10分、d=
0.940 〜0.970g/ cm3 )より成ると共に、内層がC4系
LL(MI=0.1 〜30g/10分、d=0.900 〜0.945g/ cm
3 )より成り、フィルム成形時のドロー比が5〜50であ
るため、エレメンドルフ引裂き強度E、易裂性の度合
い、引裂き時のフィルム間隔の誤差α、直線カット性の
度合い、フィルムインパクト強度及びシール強度につい
て良好又は問題がないことがわかる。
Discussion of Examples and Comparative Examples According to the easily tearable films according to Examples 1 to 11, the outer layer and the intermediate layer each had HDPE (MI = 0.02 to 20 g / 10 minutes, d =
0.940 to 0.970 g / cm 3 ) and the inner layer is C4 type LL (MI = 0.1 to 30 g / 10 minutes, d = 0.900 to 0.945 g / cm 3 )
3 ) and the draw ratio at the time of film formation is 5 to 50, the Elemendorf tear strength E, the degree of easy tearability, the film spacing error α at the time of tearing, the degree of linear cutability, the film impact strength and It can be seen that the seal strength is good or has no problem.

【0026】従って、このような易裂性フィルムは、易
裂性と直線カット性の度合いが優れているため、この易
裂性フィルムを包装袋用ラミネートフィルムの基材フィ
ルムとして使用すれば、引裂き開封が容易になる。ま
た、このような易裂性フィルムは、フィルムインパクト
強度とシール強度が優れているため、この易裂性フィル
ムが用いられた包装袋は、内容物を良好に保護すること
ができる。
Therefore, since such an easily tearable film has excellent degree of easy tearability and linear cutability, if this easily tearable film is used as a base film of a laminate film for a packaging bag, it will tear. Easy to open. Further, since such an easily tearable film has excellent film impact strength and seal strength, the packaging bag using the easily tearable film can well protect the contents.

【0027】これに対して、比較例1〜3に係るフィル
ムによれば、実施例と比べて、内層がHDPEになって
いるため、フィルムインパクト強度とシール強度につい
て問題があった。比較例4〜6に係るフィルムによれ
ば、実施例と比べて、外層と中間層がC4系LLになっ
ているため、直線カット性の度合いについて問題があっ
た。
On the other hand, the films according to Comparative Examples 1 to 3 had a problem in film impact strength and seal strength because the inner layer was made of HDPE as compared with the examples. According to the films of Comparative Examples 4 to 6, the outer layer and the intermediate layer were C4 type LL as compared with the examples, and thus there was a problem in the degree of linear cutability.

【0028】比較例7,9〜11に係るフィルムによれ
ば、実施例と比べて、フィルム成形時のドロー比が5よ
り小さいため、直線カット性の度合いが不良であった。
比較例8,12に係るフィルムによれば、実施例と比べ
て、フィルム成形時のドロー比が50より小さいため、フ
ィルムインパクト強度とシール強度について問題あっ
た。
According to the films of Comparative Examples 7 and 9 to 11, the degree of linear cutting property was poor because the draw ratio during film forming was smaller than 5 as compared with the Examples.
The films according to Comparative Examples 8 and 12 had a problem in film impact strength and seal strength because the draw ratio at the time of film formation was smaller than 50 as compared with the examples.

【0029】比較例13〜15に係るフィルムによれば、実
施例と比べて、内層がC6系LLになっているため、易
裂性と直線カット性の度合いについて問題があった。比
較例16〜18に係るフィルムによれば、実施例と比べて、
内層がC8系LLになっているため、易裂性と直線カッ
ト性の度合いが不良であった。
According to the films of Comparative Examples 13 to 15, the inner layer was made of C6 type LL as compared with the Examples, so that there was a problem in the degree of easy tearability and linear cutability. According to the films according to Comparative Examples 16 to 18, as compared with the examples,
Since the inner layer was C8 type LL, the degree of easy tearability and linear cutability was poor.

【0030】[0030]

【発明の効果】本発明によれば、易裂性が優れ、かつヒ
ートシール性能にも優れた易裂性フィルムが得られる。
従って、この易裂性フィルムを包装袋用ラミネートフィ
ルムの基材フィルムとして使用すれば、引裂き開封が容
易になり、また内容物を良好に保護することができる。
EFFECTS OF THE INVENTION According to the present invention, an easily tearable film having excellent easy tearability and heat sealing performance can be obtained.
Therefore, when this easily tearable film is used as a base film of a laminate film for a packaging bag, tearing and opening can be facilitated and the contents can be well protected.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 // B29K 23:00 B29L 9:00 4F ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location // B29K 23:00 B29L 9:00 4F

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 高密度ポリエチレン(MI=0.02〜20g/
10分、d=0.940 〜0.970g/ cm3 )より成る層と、エチ
レンと1−ブテンとの共重合による直鎖状低密度ポリエ
チレン(MI=0.1 〜30g/10分、d=0.900 〜0.945g/
cm3 )より成る層とを含む積層フィルムであって、フィ
ルム成形時のドロー比が5〜50である易裂性フィルム。
1. High density polyethylene (MI = 0.02 to 20 g /
10 minutes, a layer composed of d = 0.940 to 0.970 g / cm 3 ) and a linear low-density polyethylene (MI = 0.1 to 30 g / 10 minutes, d = 0.900 to 0.945 g) obtained by copolymerization of ethylene and 1-butene. /
A laminated film comprising a layer made of cm 3), tearable film draw ratio during film molding is 5 to 50.
【請求項2】 高密度ポリエチレン(MI=0.02〜20g/
10分、d=0.940 〜0.970g/ cm3 )より成る層と、エチ
レンと1−ブテンとの共重合による直鎖状低密度ポリエ
チレン(MI=0.1 〜30g/10分、d=0.900 〜0.945g/
cm3 )より成る層とを含む積層フィルムを共押出し成形
し、このフィルム成形時のドロー比を5〜50としたこと
を特徴とする易裂性フィルムの製造方法。
2. High density polyethylene (MI = 0.02 to 20 g /
10 minutes, a layer composed of d = 0.940 to 0.970 g / cm 3 ) and a linear low-density polyethylene (MI = 0.1 to 30 g / 10 minutes, d = 0.900 to 0.945 g) obtained by copolymerization of ethylene and 1-butene. /
A method for producing an easily tearable film, characterized in that a laminated film containing a layer comprising cm 3 ) is coextruded and the draw ratio at the time of film formation is set to 5 to 50.
JP4037964A 1992-02-25 1992-02-25 Easy tearing film and method for producing the same Expired - Fee Related JP2665426B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4037964A JP2665426B2 (en) 1992-02-25 1992-02-25 Easy tearing film and method for producing the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4037964A JP2665426B2 (en) 1992-02-25 1992-02-25 Easy tearing film and method for producing the same

Publications (2)

Publication Number Publication Date
JPH05229079A true JPH05229079A (en) 1993-09-07
JP2665426B2 JP2665426B2 (en) 1997-10-22

Family

ID=12512249

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2665426B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2721007A1 (en) * 1994-06-13 1995-12-15 Fayard Ravel Sa Thermoplastic composite film, intended for packaging.
JP2002069214A (en) * 2000-06-14 2002-03-08 Sumitomo Chem Co Ltd T-die cast film and film for self-adhesive package
JP2002193319A (en) * 2000-12-28 2002-07-10 Toyo Seikan Kaisha Ltd Packaging bag

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2721007A1 (en) * 1994-06-13 1995-12-15 Fayard Ravel Sa Thermoplastic composite film, intended for packaging.
BE1009799A3 (en) * 1994-06-13 1997-08-05 Fayard & Ravel Film composite thermoplastic for packaging.
JP2002069214A (en) * 2000-06-14 2002-03-08 Sumitomo Chem Co Ltd T-die cast film and film for self-adhesive package
JP2002193319A (en) * 2000-12-28 2002-07-10 Toyo Seikan Kaisha Ltd Packaging bag

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