JPH03189147A - Heat-shrinkable laminated film - Google Patents
Heat-shrinkable laminated filmInfo
- Publication number
- JPH03189147A JPH03189147A JP1330374A JP33037489A JPH03189147A JP H03189147 A JPH03189147 A JP H03189147A JP 1330374 A JP1330374 A JP 1330374A JP 33037489 A JP33037489 A JP 33037489A JP H03189147 A JPH03189147 A JP H03189147A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- film
- density polyethylene
- laminated film
- shrinkage
- 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.)
- Pending
Links
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 21
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 21
- 238000002844 melting Methods 0.000 claims abstract description 8
- 230000008018 melting Effects 0.000 claims abstract description 8
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 15
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 15
- 239000000155 melt Substances 0.000 claims description 2
- 229920001684 low density polyethylene Polymers 0.000 abstract description 12
- 239000004702 low-density polyethylene Substances 0.000 abstract description 12
- 238000004806 packaging method and process Methods 0.000 abstract description 10
- 229920006257 Heat-shrinkable film Polymers 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 4
- 238000001125 extrusion Methods 0.000 abstract description 3
- 239000010408 film Substances 0.000 description 44
- 239000011347 resin Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 4
- 230000004927 fusion Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 229920006300 shrink film Polymers 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- 101150096839 Fcmr gene Proteins 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- -1 butene Chemical compound 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000005001 laminate film Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 235000021067 refined food Nutrition 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、低温収縮性と耐熱性を有し、かつ、透明性、
強度に優れた熱収縮積層フィルムに関する。[Detailed description of the invention] [Industrial application field] The present invention has low-temperature shrinkability and heat resistance, and also has transparency and
This invention relates to a heat-shrinkable laminated film with excellent strength.
本発明の熱収縮積層フィルムは、特に、食品容器等の収
縮包装用フィルムとして好適である。The heat-shrinkable laminated film of the present invention is particularly suitable as a film for shrink-wrapping food containers and the like.
一般に、収縮包装用フィルムには、適度な収縮率とフィ
ルム強度、透明性などが求められる。In general, shrink wrapping films are required to have appropriate shrinkage rates, film strength, transparency, etc.
また、収縮包装においては、溶断シールされた後、赤外
線加熱などによる収縮トンネルを通過して収縮が完了す
るが、加熱による内容品への悪影響を避けるために、収
縮フィルムに低温収縮性が要求される。さらに、耐熱性
を有し、かつ、被包装物への熱融着がないことも重要な
要求性能となっている。In addition, in shrink packaging, after being fused and sealed, the shrinkage is completed by passing through a shrink tunnel using infrared heating, etc., but in order to avoid the negative effects of heating on the contents, the shrink film must have low-temperature shrinkability. Ru. Furthermore, heat resistance and no heat fusion to the packaged items are also important performance requirements.
しかしながら、従来の収縮フィルムでは、最近の要求水
準から見て、各種性能が未だ不十分である。However, conventional shrink films are still insufficient in various performances in view of recent required standards.
従来、飲料容器、ガラスボトルをはじめ各種カートンの
集積包装用などに、低密度ポリエチレン（ＬＤＰＥ）製
の収縮包装用フィルムが多用されている。ところが、Ｌ
ＤＰＥ製の収縮包装用フィルムは、加熱収縮時にフィル
ム同志が熱融着して美麗に仕上がらず、また、飲料用紙
容器の集積包装では、紙容器自体あるいは付帯のストロ
−とフィルムが熱融着してしまうという欠陥があった。Conventionally, shrink wrapping films made of low density polyethylene (LDPE) have been widely used for the integrated packaging of various cartons including beverage containers and glass bottles. However, L
Shrink packaging films made of DPE do not have a beautiful finish because the films adhere to each other during heat shrinkage, and in the case of integrated packaging for beverage paper containers, the paper containers themselves or attached straws and the film may adhere to each other. There was a flaw in that it ended up happening.
さらに、ＬＤＰＥ製の収縮包装用フィルムは、アルミサ
ツシ、化粧合板など建材用途の収縮包装では、建材表面
のマスキングフィルムと熱収縮時に同様に熱融着すると
いう欠点がある。Furthermore, when shrink wrapping films made of LDPE are used for building materials such as aluminum sash and decorative plywood, they have the disadvantage of being thermally fused to the masking film on the surface of the building material during heat shrinkage.
低密度ポリエチレンを延伸して、低温収縮性を高めたも
のもあるが、収縮温度を引き下げることにより、熱融着
は防げるものの、低温収縮のため、結束力に欠ける。そ
こで、収縮温度を少し上げると、収縮率が高くなるため
収縮トンネル内でフィルムが破断してしまい、収縮温度
範囲が極めて狭いという欠点があった。There are products that have increased low-temperature shrinkability by stretching low-density polyethylene, but although heat fusion can be prevented by lowering the shrinkage temperature, they lack cohesive strength due to low-temperature shrinkage. Therefore, if the shrinkage temperature is slightly raised, the shrinkage rate increases and the film breaks within the shrinkage tunnel, resulting in a drawback that the shrinkage temperature range is extremely narrow.
直鎖状低密度ポリエチレン（Ｌ−ＬＤＰＥ）の延伸フィ
ルムでは、低密度ポリエチレンの延伸フィルムより性能
は改善されるが、充分ではない。A stretched film of linear low-density polyethylene (L-LDPE) has improved performance over a stretched film of low-density polyethylene, but it is not sufficient.
エチレン・酢酸ビニル共重合体（ＥＶＡ）の延伸フィル
ムも低密度ポリエチレンの延伸フィルムと同様に収縮温
度範囲が狭い。A stretched film of ethylene/vinyl acetate copolymer (EVA) also has a narrow shrinkage temperature range, similar to a stretched film of low density polyethylene.
高密度ポリエチレン（ＨＤＰＥ）の延伸フィルムは、熱
融着はしないけれども、収縮性能が不十分で、収縮不足
により美麗な仕上がりが得られない。Stretched films of high density polyethylene (HDPE) are not heat-sealable, but their shrinkage performance is insufficient, and a beautiful finish cannot be obtained due to insufficient shrinkage.
電子線を照射して延伸した低密度ポリエチレンフィルム
は、熱融着せず、美麗な包装仕上りが得られるが、架橋
しているため、汎用の包装機が用いられず、シールのた
めに専用機が必要なことと、フィルムが高価である等の
欠点があった。Low-density polyethylene film stretched by irradiation with electron beams does not undergo heat sealing and produces a beautiful packaging finish, but because it is cross-linked, general-purpose packaging machines cannot be used, and special machines are required for sealing. There were disadvantages, such as the necessity and the high cost of the film.
本発明の目的は、積層する樹脂を選択し、複合延伸する
ことにより、それぞれの樹脂単体では達成できない前述
の欠点を克服した諸性能に優れた熱収縮性積層フィルム
を提供することにある。An object of the present invention is to provide a heat-shrinkable laminated film that overcomes the aforementioned drawbacks that cannot be achieved with each resin alone and has excellent performance by selecting resins to be laminated and carrying out composite stretching.
また、本発明の目的は、汎用の収縮包装機にも適用でき
て、かつ、安価な熱収縮フィルムを提供することにある
。Another object of the present invention is to provide an inexpensive heat-shrinkable film that can be applied to general-purpose shrink wrapping machines.
本発明者らは、前記した従来技術の問題点を克服するた
めに鋭意研究した結果、特定の高密度ポリエチレンと直
鎖状低密度ポリエチレンの２層共押出稿層シートを一軸
延伸して得た積層フィルムが、透明性や強度が良好で、
低温収縮性を有するなど、優れた諸性能を有することを
見出し、その知見に基づいて本発明を完成するに至った
。As a result of intensive research in order to overcome the problems of the prior art described above, the present inventors obtained a two-layer coextruded draft layer sheet of specific high-density polyethylene and linear low-density polyethylene by uniaxially stretching. The laminated film has good transparency and strength,
It was discovered that it has various excellent properties such as low-temperature shrinkability, and the present invention was completed based on this knowledge.
かくして、本発明によれば、片面が密度０．９１５〜０
．９３５ｇ／ｃｄ、融点１２０〜１２８℃の直鎖状低密
度ポリエチレンで、他面がメルトインデックス０．３〜
０．６、融点１３３〜１３６℃、密度０．９３５〜０．
９４５ｇ／ｃｒｔの高密度ポリエチレンからなる２層共
押出積層シートを、１００℃以下の延伸温度にて、少な
くとも２倍以上に一軸延伸した積層フィルムであって、
両層の厚味の比が２０ ： ８０〜８０ ： ２０であ
ることを特徴とする熱収縮性積層フィルムが提供される
。Thus, according to the invention, one side has a density of 0.915 to 0.
．． 935g/cd, linear low density polyethylene with a melting point of 120~128℃, the other side has a melt index of 0.3~
0.6, melting point 133-136°C, density 0.935-0.
A laminate film obtained by uniaxially stretching a two-layer coextruded laminate sheet made of 945 g/crt high-density polyethylene at a stretching temperature of 100° C. or lower to at least twice the amount,
A heat-shrinkable laminated film is provided, characterized in that the thickness ratio of both layers is 20:80 to 80:20.
以下、本発明について詳述する。The present invention will be explained in detail below.
本発明において使用する直鎖状低密度ポリエチレン（Ｌ
−ＬＤＰＥ）は、密度０．９１５〜０゜９３５ｇ／ｃｒ
ｔｒ、融点１２０〜１２８℃（示差走査熱量計ＤＳＣに
より測定）のポリマーである。Linear low density polyethylene (L
-LDPE) has a density of 0.915 to 0°935g/cr
It is a polymer with a melting point of 120 to 128°C (measured by differential scanning calorimeter DSC).
このＬ−ＬＤＰＥは、エチレンとブテンなとのα−オレ
フィンとの共重合体であり、ＬＤＰＥに比べて、引張強
さ、突き刺し強さ、引き裂き強さ等に優れており、単体
フィルムとして加工食品等の包装用に使用されている。This L-LDPE is a copolymer of ethylene and α-olefin such as butene, and has superior tensile strength, puncture strength, tear strength, etc. compared to LDPE, and can be used as a single film for processed foods. It is used for packaging such as.
Ｌ−ＬＤＰＥ単体の延伸した熱収縮フィルムでは、収縮
率が大きく、急激に収縮するため、皺がよりやすく、収
縮トンネル温度が高い場合や通過時間が長い場合に破断
し易く、美麗な仕上り外観を得る条件が極めて狭い。Stretched heat-shrinkable film made of L-LDPE alone has a high shrinkage rate and shrinks rapidly, so it wrinkles easily and breaks easily when the shrink tunnel temperature is high or the passage time is long, resulting in a beautiful finished appearance. The conditions for obtaining it are extremely narrow.
本発明の積層フィルムにおいて、他面を構成するのは、
メルトインデックス０．３〜０．６、融点１３３〜１３
６℃（ＤＳＣで測定）、密度０．９３５〜０．９４５ｇ
／ｃｒｒｒの高密度ポリエチレン（ＨＤＰＥ）である。In the laminated film of the present invention, the other side is composed of:
Melt index 0.3-0.6, melting point 133-13
6℃ (measured by DSC), density 0.935-0.945g
/crrr high density polyethylene (HDPE).
このＨＤＰＥは、ヘーズ７％以下、５％引張り弾性率３
，０００〜４，５００ｋｇ／ｃゴであると、透明度や強
度が良好となるため、好ましい。This HDPE has a haze of 7% or less and a tensile modulus of 5% and 3
,000 to 4,500 kg/c is preferable because transparency and strength are good.
ＨＤＰＥ単体の熱収縮フィルムでは、良好な低温収縮性
を得ることができない。Good low-temperature shrinkability cannot be obtained with a heat-shrinkable film made of HDPE alone.
積層構成は、片面がＬ−ＬＤＰＥで、他面が特定のＨＤ
ＰＥ、すなわちＬ−ＬＤＰＥ／ＨＤＰＥの２層積層構成
である。The laminated structure is L-LDPE on one side and specific HD on the other side.
It has a two-layer laminated structure of PE, that is, L-LDPE/HDPE.
Ｌ−ＬＤＰＥとＨＤＰＥを積層することにより、両者の
欠点が互いに相殺され、（１）ＬＤＰＥやＥＶＡの収縮
フィルムに比べて、耐熱性があり、収縮包装時に内容物
と熱融着しにくい、（２）フィルムの引張強度を出して
、薄肉フィルムでも実用化でき、（３）Ｌ−ＬＤＰＥ単
体の熱収縮フィルムでは、収縮率が大きく、急激に収縮
してフィルムが破断し易いが、ＨＤＰＥを組合わせるこ
とにより、収縮力を調整して、破断しにくくなり、かつ
、耐熱性が向上し、収縮トンネル内で破断しに（くなる
、したがって、収縮温度範囲が広がり、作業性が向上す
る。By laminating L-LDPE and HDPE, the drawbacks of both cancel each other out. (1) It is more heat resistant than LDPE or EVA shrink films, and is less likely to heat-fuse with the contents during shrink wrapping. 2) The tensile strength of the film is increased so that even a thin film can be put to practical use. (3) Heat-shrinkable films made of L-LDPE alone have a high shrinkage rate and are prone to rapid shrinkage and breakage, but By combining these, the shrinkage force can be adjusted, making it difficult to break, and improving heat resistance, making it difficult to break inside the shrink tunnel, thus widening the shrinkage temperature range and improving workability.
本発明の熱収縮性フィルムの製造方法は、Ｌ−ＬＤＰＥ
／ＨＤＰＨの２層積層シートを共押出法により、積層グ
イから溶融押出を行ない、冷却固化し、次いで、１００
℃以下、好ましくは７５〜９０℃の範囲内の延伸温度に
再加熱して縦方向に２倍以上の延伸倍率で一軸延伸した
後、冷却することを特徴としている。The method for producing a heat-shrinkable film of the present invention includes L-LDPE
A two-layer laminated sheet of /HDPH was melt-extruded from a laminated goo using a co-extrusion method, cooled and solidified, and then
The film is characterized in that it is reheated to a stretching temperature of 75 to 90° C. or less, uniaxially stretched in the longitudinal direction at a stretching ratio of 2 times or more, and then cooled.
積層シートの共押出には、複数の押出機を用い、サーキ
エライダーによってチューブ状に押し出すか（インフレ
ーシロン法）、またはＴダイによってフラット状に押し
出すか（Ｔダイ法）のいずれかが好ましい。For coextrusion of the laminated sheet, it is preferable to use multiple extruders and extrude it into a tube shape using a Circhielider (inflation silon method) or extrude it into a flat shape using a T-die (T-die method). .
チューブ状に溶融押出する場合は、水槽内に浸漬するか
冷却空気を吹き付けて冷却固化させ、次いで、１００℃
以下の延伸温度に再加熱して、縦方向に引き取りロール
を使って２倍以上に延伸する。Ｔダイを用いて積層シー
トをフラット状に溶融押出する場合には、冷却ロールま
たは冷却空気と接触させて急冷固化し、次いで、１００
℃以下の延伸温度に再加熱し、延伸ロールの組み合わせ
により縦方向に２倍以上延伸する。When melt extruding into a tube shape, it is immersed in a water bath or cooled and solidified by blowing cooling air, and then heated to 100°C.
The film is reheated to the following stretching temperature and stretched to more than twice the length using a take-up roll in the machine direction. When melt-extruding a laminated sheet into a flat shape using a T-die, it is brought into contact with a cooling roll or cooling air to rapidly cool and solidify, and then
The film is reheated to a stretching temperature of 0.degree.
延伸温度が１００℃を越えると、低温熱収縮性が得られ
ない０本発明の熱収縮積層フィルムは、８０℃の温度の
雰囲気中に入れて５分後の縦方向における寸法収縮率が
２０％以上であり、低温収縮性が良好である。If the stretching temperature exceeds 100°C, low-temperature heat shrinkability cannot be obtained.The heat-shrinkable laminated film of the present invention has a dimensional shrinkage rate of 20% in the longitudinal direction after 5 minutes of being placed in an atmosphere at a temperature of 80°C. The above results indicate good low-temperature shrinkability.
また、本発明の一軸延伸した積層フィルムのへ一ズが１
０％以下で、透明度が良好であるが、これは、特定の限
定された物性を有するＨＤＰＥを用いることによって初
めて発現するのであり、前記特定のＨＤＰＥ以外の汎用
のＨＤＰＥを用いた場合には、フィルムの白化や透明性
の低下が生じる。Further, the helix of the uniaxially stretched laminated film of the present invention is 1
0% or less, the transparency is good, but this can only be achieved by using HDPE with specific and limited physical properties, and if a general-purpose HDPE other than the specific HDPE is used, Whitening of the film and reduction in transparency occur.
本発明の熱収縮性積層フィルムは、総厚味が通常、２５
〜５０μｍで、両層の厚味の比が２０＝８０〜８０ ：
２０であることが必要である。The heat-shrinkable laminated film of the present invention usually has a total thickness of 25
~50 μm, the thickness ratio of both layers is 20 = 80 ~ 80:
It needs to be 20.
上記厚味構成の範囲内において、良好な収縮性能が得ら
れる。ＨＤＰＥ層の厚味が２０％未満であると、耐熱性
が低下して、熱収縮温度範囲が狭くなって作業性が低下
し、逆に、８０％を越えると、低温収縮性が低下し、良
好な仕上り外観が得られず、また、透明度が大幅に低下
してくる。Good shrinkage performance can be obtained within the range of the above thickness structure. If the thickness of the HDPE layer is less than 20%, the heat resistance will decrease, and the heat shrinkage temperature range will become narrower, resulting in a decrease in workability.On the other hand, if the thickness exceeds 80%, the low-temperature shrinkability will decrease, A good finished appearance cannot be obtained, and the transparency is significantly reduced.
以下に実施例および比較例を挙げて本発明を具体的に説
明する。The present invention will be specifically explained below by giving Examples and Comparative Examples.
［実施例１］
共押出２層インフレーションにて、片面には直鎖状低密
度ポリエチレン樹脂（三井石油：ウルトゼックス３０２
１Ｆ）、他面には高密度ポリエチレン樹脂（東ソ：ニボ
ロン５−ＦＷＯ５）を用いて、２層未延伸シートを作製
した。その時の未延伸フィルムの厚味は、８０μｍ／４
０μｍであった。[Example 1] In coextrusion two-layer inflation, one side was coated with linear low-density polyethylene resin (Mitsui Oil: Ultzex 302).
1F) and a high-density polyethylene resin (Toso: Niboron 5-FWO5) on the other side, a two-layer unstretched sheet was prepared. The thickness of the unstretched film at that time was 80 μm/4
It was 0 μm.
次に、−軸延伸機にて、延伸温度９０℃で縦方向に３倍
延伸した後、冷却して総厚味４０μｍの熱収縮性フィル
ムを得た。Next, the film was stretched 3 times in the longitudinal direction using a -axis stretching machine at a stretching temperature of 90° C., and then cooled to obtain a heat-shrinkable film with a total thickness of 40 μm.
得られた熱収縮性積層フィルムについて、透明度（ヘー
ズ）、縦方向の熱収縮率（８０℃×５分）、および熱収
縮条件をかえて包装外観を観察した。Regarding the obtained heat-shrinkable laminated film, the packaging appearance was observed while changing the transparency (haze), the longitudinal heat-shrinkage rate (80° C. x 5 minutes), and the heat-shrinkage conditions.
物性の測定方法は、次ぎのとおりである。The method for measuring physical properties is as follows.
ヘーズ：ＪＩＳ Ｋ−７１０５
！１８１！！ ： ８０℃の恒温槽にフィルムを入れて
、５分間経過後に取り出し、縦方向（延伸方向）の寸法
収縮率を測定した。Haze: JIS K-7105! 181! ! : The film was placed in a constant temperature bath at 80° C. and taken out after 5 minutes, and the dimensional shrinkage rate in the longitudinal direction (stretching direction) was measured.
乱笠工Ｉ：熱収縮条件（収縮トンネル温度、トンネル内
通過時間）を第１表に示すように変化させて、ストロ−
付き紙容器積層品を熱収縮フィルムで収縮包装し、得ら
れた包装品について、被包装物との熱融着やフィルム同
志の熱融着の有無、タイトで美麗な包装仕上り外観であ
るか否か、フィルムの破れ有無等について観察した。Rankasa Engineering I: By changing the heat shrinkage conditions (shrinkage tunnel temperature, tunnel passage time) as shown in Table 1,
Shrink-wrap paper container laminates with heat-shrinkable film, and check whether there is heat fusion with the packaged item or between the films, and whether the packaging has a tight and beautiful appearance. The film was also observed to see if it was torn or not.
結果を第１表に示す。The results are shown in Table 1.
［比較例１］
ＨＤＰＥ層として、−船釣な高密度ポリエチレン樹脂（
三菱油化：ユカロンＥＸ４０、メルトインデックス１，
１、密度０．９６０）を用いた以外は、実施例１と同様
にして２層積層構造の熱収縮性積層フィルムを作成し、
同様に評価した。[Comparative Example 1] As the HDPE layer, a high-density polyethylene resin used for boat fishing (
Mitsubishi Yuka: Yucalon EX40, Melt Index 1,
A heat-shrinkable laminated film with a two-layer laminated structure was created in the same manner as in Example 1, except that 1, density 0.960) was used,
They were evaluated in the same way.
［比較例２］
高密度ポリエチレン樹脂（東ソ；ニボロン５−ＦＷＯ５
）単体を用いた以外は、実施例１と同様にして熱収縮性
積層フィルム（厚味４０μｍ）を作成し、同様に評価し
た。[Comparative Example 2] High-density polyethylene resin (Toso; Niboron 5-FWO5
) A heat-shrinkable laminated film (thickness: 40 μm) was prepared in the same manner as in Example 1, except that a single film was used, and evaluated in the same manner.
［比較例３］
直鎖状低密度ポリエチレン樹脂（三井石油：ウルトゼッ
クス３０２１Ｆ）単体を用いた以外は、実施例１と同様
にして熱収縮性積層フィルム（厚味４０μｍ）を作成し
、同様に評価した。[Comparative Example 3] A heat-shrinkable laminated film (thickness: 40 μm) was prepared in the same manner as in Example 1, except that a linear low-density polyethylene resin (Mitsui Oil Co., Ltd.: Ultzex 3021F) was used alone, and the film was processed in the same manner. evaluated.
［実施例４］
実施例１において、延伸温度を１１０℃にかえた以外は
、実施例１と同様にして３層積層構造の熱収縮性積層フ
ィルムを作成し、同様に評価した。[Example 4] A heat-shrinkable laminate film having a three-layer laminate structure was prepared in the same manner as in Example 1 except that the stretching temperature was changed to 110° C., and evaluated in the same manner.
結果を一括して第１表に示す。The results are summarized in Table 1.
（以下余白）
〔発明の効果〕
本発明によれば、透明性や低温収縮性に優れ、被包装物
との熱融着が低減され、美麗な包装外観を与え、かつ８
、耐熱性があって、収縮トンネル内で破断することがな
い等の優れた熱収縮性フィルムが提供される。(The following is a blank space) [Effects of the Invention] According to the present invention, the present invention has excellent transparency and low-temperature shrinkability, reduces heat fusion with the packaged object, provides a beautiful packaging appearance, and
Provided is a heat-shrinkable film that has excellent heat resistance and does not break in the shrink tunnel.
また、フィルム強度が大きく、薄肉化できるため、低コ
スト化がはかれる。Furthermore, since the film has high strength and can be made thinner, costs can be reduced.
さらに、本発明の積層構成を採用することにより、汎用
の収縮包装機が適用でき、熱収縮トンネルの温度範囲が
広くてもフィルムが破断しにくいため、作業性が向上す
る。Furthermore, by adopting the laminated structure of the present invention, a general-purpose shrink wrapping machine can be applied, and the film is difficult to break even in a wide temperature range of the heat shrink tunnel, so workability is improved.
Claims (1)
、融点１２０〜１２８℃の直鎖状低密度ポリエチレンで
、他面がメルトインデックス０．３〜０．６、融点１３
３〜１３６℃、密度０．９３５〜０．９４５ｇ／ｃｍ＾
２の高密度ポリエチレンからなる２層共押出積層シート
を、１００℃以下の延伸温度にて、少なくとも２倍以上
に一軸延伸した積層フィルムであって、両層の厚味の比
が２０：８０〜８０：２０であることを特徴とする熱収
縮性積層フィルム。(1) One side has a density of 0.915 to 0.935 g/cm^2
, linear low-density polyethylene with a melting point of 120-128°C, the other side having a melt index of 0.3-0.6 and a melting point of 13
3~136℃, density 0.935~0.945g/cm^
A laminated film obtained by uniaxially stretching a two-layer coextruded laminated sheet made of high-density polyethylene No. 2 to at least twice the amount at a stretching temperature of 100° C. or less, the thickness ratio of both layers being 20:80 to 20:80. A heat-shrinkable laminated film characterized by a ratio of 80:20.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1330374A JPH03189147A (en) | 1989-12-19 | 1989-12-19 | Heat-shrinkable laminated film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1330374A JPH03189147A (en) | 1989-12-19 | 1989-12-19 | Heat-shrinkable laminated film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03189147A true JPH03189147A (en) | 1991-08-19 |
Family
ID=18231889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1330374A Pending JPH03189147A (en) | 1989-12-19 | 1989-12-19 | Heat-shrinkable laminated film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03189147A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011051592A (en) * | 2009-08-31 | 2011-03-17 | Asahi Kasei Chemicals Corp | Shrink film for cover tape and cover tape |
| US8999502B2 (en) | 2009-08-31 | 2015-04-07 | Asahi Kasei Chemicals Corporation | Cover tape, method for manufacturing cover tape, and electronic part package |
-
1989
- 1989-12-19 JP JP1330374A patent/JPH03189147A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011051592A (en) * | 2009-08-31 | 2011-03-17 | Asahi Kasei Chemicals Corp | Shrink film for cover tape and cover tape |
| US8999502B2 (en) | 2009-08-31 | 2015-04-07 | Asahi Kasei Chemicals Corporation | Cover tape, method for manufacturing cover tape, and electronic part package |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5558930A (en) | Heat sealable, high moisture barrier film and method of making same | |
| EP0561428B1 (en) | Oxygen barrier packaging film | |
| CA1317427C (en) | Biaxially oriented multilayer barrier films | |
| US4726984A (en) | Oxygen barrier oriented film | |
| US4865902A (en) | Multilayered polyolefin high shrinkage, low-shrink force shrink film | |
| EP0229715B1 (en) | Multilayered polyolefin high shrinkage low-shrink force shrink film | |
| CA1286642C (en) | Thermoplastic sack | |
| US6218024B1 (en) | Multilayer plastic film | |
| US20040166261A1 (en) | Heat-shrinkable packaging receptacle | |
| JPS6412226B2 (en) | ||
| JPH04248855A (en) | Blend of polypropylene with ethylene copolymer, and film made from this blend | |
| JPH0899394A (en) | Polypropylene type heat-shrinkable laminated film | |
| JP2024019621A (en) | packaging | |
| WO1991017886A1 (en) | Multilayer heat shrinkable polymeric film containing recycle polymer | |
| US5985388A (en) | Multi-layer transparent sealant film for laminating comprising high density polyethylene layer and packaging flim and pouch using the same | |
| CN108995333A (en) | A kind of BOPE high-barrier composite membrane and packaging material and packaging product comprising it | |
| JP3093020B2 (en) | Heat shrinkable laminated film | |
| JP4750367B2 (en) | Heat shrinkable packaging | |
| JPH04232048A (en) | Ethylene propyrene terpolymer film | |
| JP2001139041A (en) | Tubular container and its manufacturing method | |
| JPH03189147A (en) | Heat-shrinkable laminated film | |
| JPH03189146A (en) | Heat-shrinkable laminated film | |
| JPS625060B2 (en) | ||
| JPH0421192B2 (en) | ||
| JPH03189148A (en) | Heat-shrinkable laminated film |