CN1329543A - 多层复合薄膜及其应用 - Google Patents
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Abstract
本发明涉及一种包装食品的多层复合薄膜,包括夹入两个PE外层之间的PP层。所述薄膜的厚度范围在30μm到120μm之间,外层由LLDPE制成,其密度d在0.919<d<0.930g/cm3之间,中间层由30-70%重量的PP,其密度d为0.895<d<0.905g/cm3,熔融指数在0.75到0.85g/10min之间,10-30%重量的所述LLDPE和10-30%重量的热塑性聚烯烃制成,其中热塑性聚烯体的密度d为0.885<d<0.905g/cm3,熔融指数在0.55到0.65g/10min之间。
Description
本发明涉及一种食品级质量的多层复合薄膜,其厚度在30μm到120μm之间,包括夹入两个LLDPE外层之间的PP层,其中LLDPE的密度d在0.919<d<0.930g/cm3之间,以及这种薄膜的应用。
多层复合薄膜是公知的,并且通常根据所需的性能将不同的聚合物材料的物理或化学性能相结合。
EP0247896公开的一种可焊薄膜,包括含有聚烯烃的基层,其中在它的至少一面上具有1-20%重量的基于薄膜基层的、含有70-95%重量LLDPE和5-30%重量的分子量低于LLDPE的树脂的混合物。
在JP09207294中,还有另外一种基于聚丙烯的可焊多层薄膜,包括至少一个密度为0.893-0.903g/cm3的LLDPE外层,其熔融指数为0.1-10g/10min并且含有达20%的共聚单体。
JP09314769公开了一种可焊薄膜,包括在LLDPE薄膜的相对面上层压一个聚丙烯类型的挠性树脂薄膜。
JP10272747涉及一种三层或更多层的可拉伸薄膜,在中间层表面上包括一个LLDPE层和一个非结晶形的共聚物层,其中中间层是聚丙烯(C)和聚丁烯-1(D)以比率(C)/(D)=0.1-9.0的混合物。非离子型的表面活性剂与一层或多层结合。
除了本身可增加薄膜的模塑性能的粘合剂助催化剂外,US5085927还建议通过加入一种弹性体化合物来增加可拉伸薄膜的模塑性能。
此外,特别在WO98/28199中已经建议一种用于包装液体的袋子,包括一个控制液体分配的阀,其中该阀由两个薄膜叠加来组成的,沿着两个未合并线焊接,以通过这两个薄膜的分离来形成分配通道。这个通道优选具有入口通道,其周长与吸管的周长相对应,其中吸管末端是凸起的。这种薄膜具有足够的弹性,以在将这个吸管插入时使其膨胀然后围绕吸管闭合以防止它从所述通道中被抽出。因此该吸管是固定到袋子上的,并且仅能按需要量来抽出,以允许形成阀的通道关闭。
因此形成阀的薄膜的材料应该具有足够弹性以围绕吸管闭合,同时允许凸出部分经过。这种薄膜应适于饮料,并且因此适于涉及到食品的肉类标准。作为优选的是,甚至在80℃到90℃之间的温度下处理后,这种材料也应保持其性能,这种情况对于用袋子包装的饮料来说是经常性的。
所有这些性能的组合(其中几种性能是对立的)是不容易达到的,甚至用几个不同聚合物层的组合也不行。特别是上述现有技术的文献中没有实现这些性能的组合。
本发明的目的在于获得一种能够符合至少主要需求的薄膜,也就是说除了所需能够允许形成阀的通道闭合成密封状态的挠性之外,还需要弹性和与食品标准相应的性能。作为优选,本发明薄膜能够忍受被包装液体的温度,该温度可能高达80℃甚至90℃,同时保持其完整的挠性和弹性。
为了这个目标,本发明的第一个真正主题是如权利要求1所定义的上述类型的多层复合薄膜。另外一个主题是如权利要求7所定义的这种薄膜的应用。与权利要求书中所给定义相应的该复合薄膜的多个优选实施方案均从属于权利要求1。
对作为本发明的一个主题的多层薄膜进行测试,已经显示出这种薄膜使得达到上述所有需求成为可能,该需求既关于阀,又关于在阀通道中握住吸管并明显将这个吸管引入这个通道中。这种薄膜还使得在将液体在至少80℃、可能高达90℃的温度下包装后仍保持所有这些性能。
阅读了下面的实施例之后会对本发明有了更好的理解。
根据一个实施方案,本发明主题的多层薄膜的两个外层由LLDPE(线性低密度聚乙烯)制成,其型号为Dow Elite5110,其密度d为0.925g/cm3,根据ASTM D1238标准,在230℃下测量,加入量为2.16kg,直径为2.095mm的标准喷嘴,其熔融指数MI为0.85g/10min,维卡软化温度T°v为113℃。作为优选,在该薄膜的两个外层的至少一个中加入滑爽剂,该滑爽剂在这个实施例中为900ppm的芥酸衍生物Erucamide,其分子为顺-13-二十二烯酰胺,也就是说,它位于形成阀的通道内部和由此与抽出液体的吸管接触,使得用于作为本发明主题的薄膜中的形成阀的通道内部滑动更加容易。
夹在上述外层之间的这种薄膜的中间层由60%PP的混合物组成,其中PP为Himont生产的MoplenEP-Q 30RF,它为密度为0.9g/cm3的多相共聚物,根据ASTM D 1238/L测定其熔融指数MI为0.8g/10min,其维卡软化温度T°v为150℃。这个中间层还含有20%用于形成两个上述外层的LLDPE和20%热塑性聚烯烃,其中该聚烯烃为Himont生产的AdflexQ100F,其密度为0.89g/cm3,根据ASTM D1238测定的熔融指数MI为0.6g/10min。
这种热塑性聚烯烃的作用是为聚丙烯提供足够的弹性,以使薄膜形成阀,特别是通往实际专有阀的入口通道,以在当吸管插入这个阀、抽出液体的吸管的凸出的保留部分经过时发生弹性变形。所发生的是这个入口通道的周长是相应于这个吸管的周长来选定的,使得一旦将这个吸管凸出的保留部分插入,通道包围并封闭住该吸管,防止其抽出。
作为本发明主题的薄膜的这种中间层还具有使这种薄膜能够忍受80℃或90℃的温度的作用,使得能够在这种温度下用外壳或袋子包装饮料,其中由作为本发明主题的薄膜形成的阀已经附在其上。这种热填充用于各种各样的饮料,尤其是牛奶或牛奶类饮料和果汁。在将饮料热包装之后,它必须保持其性能,特别是其弹性性能。
由此生产的薄膜还要能够在焊接不导致其降解的情况下进行焊接,也就是说薄膜应该保留其与包装的饮料的食品可混用性。
为了改善这种多层薄膜而进行了多种测试,这使得发现根据需要,薄膜厚度能够在相当宽的范围内选定成为可能,该范围从30μm到约120μm。薄膜的厚度优选选择尽可能薄的,以获得高产率。然而,由于薄膜是由三层构成的,每个单独层的厚度都需要保留足够大以使其能够被挤出。此外,由于中间层优选比每个外层都厚,在实际中薄膜厚度不可能低于30μm。在生产实施例中,薄膜厚度为40μm,其中中间层厚度为20μm,两个外层均为10μm。
为了使作为本发明主题的薄膜形成的阀完全闭合,这种薄膜应该具有良好的挠性。在LLDPE形成外层和中间层部分组分的情况下,挠性取决于密度d。这就是为什么选择LLDPE的原因,因为它的密度d能够在0.919<d<0.930g/cm3的范围之间来细微划分。对于PP而言,挠性取决于密度和熔融指数。密度d可从0.895<d<0.905g/cm3之间选定,熔融指数能够从0.75到0.85之间选定。
为了实现各层的共挤出,各个层之间的作为材料熔化温度的维卡温度不应差异过大。在上述实施例中,LLDPED维卡点T°v必须大于100℃,同时PP的维卡点必须小于160℃。作为优选,这些温度在110℃到150℃之间。
在这个实施例Erucamide中,滑爽剂的比例应小于1300ppm。虽然这种滑爽剂仅在邻接这种将位于阀通道内部的片材表面上的多层薄膜的层中有所需要,它优选加入到两个外层中,已知之后将这两个外层区别开来是非常困难的,并且由此可能具有以错误的方式卷起薄膜的危险。通过使两个侧面的完全相同,这个问题也就不再存在了。
作为优选,本发明薄膜不做任何电晕氧化处理,至少在其制造上述阀的特定应用中。
按照附图并通过由作为本发明主题的多层薄膜制造的阀的示意图的实施例对附图中的唯一附图进行描述。
这种阀位于容器内部,尤其是密封的袋子,未描述,用于包装液体,尤其是饮料。这个附图表示了这种已叠加薄膜的两个厚度1a,1b。薄膜的这两个厚度1a,1b通过焊接线2结合,在它们之间形成通道3以形成分配阀。切口4使得通道3与外面相连通,也就是说与容器的内含物相连通。这种通道3通常是闭合的,薄膜的两个厚度1a,1b为相接触的。通过插入元件来使它们分开,打开阀并由此使液体能够沿着通道3在容器内部和外部之间流动。这种用于开启通道3的元件本身为管子形成,尤其是吸管5。
这种吸管的末端有凸起5a,如EP98420015.4中所述。阀通道3的入口部分3a是窄的,并且具有与吸管5相应的周长,使得这种入口部分环绕住这个吸管5并且卡住凸出部分5a。为了使吸管5插入这个狭窄的入口部分3a,吸管5的凸出部分5a的前端具有逐渐增大的截面,这个凸出部分的后部通过支承面与吸管5的圆筒状部分相连,这防止它从通道3的入口部分3a中抽出。
为了获得围绕吸管的通道3入口部分3a的这种配合,同时无论如何使凸出部分5a能够通过,形成这种阀的多层薄膜1a,1b应该具有足够的弹性以当这个凸出部分5a一旦通过就围绕吸管5闭合。这特别是作为本发明主题的多层薄膜的作用。
Claims (8)
1.食品级质量的多层复合薄膜,其厚度在30μm到120μm之间,包括夹入两个LLDPE外层之间的基于PP的层,其中LLDPE的密度d在0.919<d<0.930g/cm3之间,其特征在于中间层含有50-70%重量的PP,其密度d为0.895<d<0.905g/cm3,熔融指数在0.75到0.85g/10min之间,10-30%重量的所述LLDPE和10-30%重量的热塑性聚烯烃,其密度d为0.885<d<0.905g/cm3,熔融指数在0.55到0.65g/10min之间。
2.如权利要求1所述复合薄膜,其特征在于LLDPE的维卡温度T°v大于100℃,PP的维卡温度小于160℃。
3.如前面的权利要求中任一项所述的复合薄膜,其特征在于它的厚度小于60μm。
4.如前面的权利要求中任一项所述的复合薄膜,其特征在于中间层的厚度基本上为两个外层中每一层的两倍。
5.如前面的权利要求中任一项所述的复合薄膜,其特征在于不进行任何电晕氧化处理。
6.如前面的权利要求中任一项所述的复合薄膜,其特征在于在所述薄膜的至少一个外层中加入少于1300ppm的Erucamide型滑爽剂。
7.应用如前面的权利要求中任一项所述的复合薄膜来形成控制饮料分配的阀,组成为所述薄膜的两个层(1a,1b)的叠加,其中所述薄膜沿着两个未合并线(2)焊接,以通过分离所述层(1a,1b)形成分配通道(3),这个分配通道(3)的入口部分(3a)的周长相当于试图分开所述层(1a,1b)的抽出管(5)的周长,使得其围绕这个抽出管(5)而配合,这种薄膜具有足够的弹性,使得具有逐渐增长的截面的凸出(5a)能够插入,它属于所述抽出管(5),并且接着为支承面将这个凸出(5a)与所述抽出管(5a)连接,防止它从所述通道(3)中抽出。
8.如权利要求7所述应用,其特征在于所述薄膜的所述加入了滑爽剂的外层是与所述通道(3)相邻接的层。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98420226.7 | 1998-12-07 | ||
EP98420226A EP1008446A1 (fr) | 1998-12-07 | 1998-12-07 | Film composite multicouches et utilisation de ce film |
Publications (2)
Publication Number | Publication Date |
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CN1329543A true CN1329543A (zh) | 2002-01-02 |
CN1121944C CN1121944C (zh) | 2003-09-24 |
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ID=8235636
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN99814132A Expired - Fee Related CN1121944C (zh) | 1998-12-07 | 1999-12-03 | 多层复合薄膜及其应用 |
Country Status (9)
Country | Link |
---|---|
US (1) | US20020127382A1 (zh) |
EP (2) | EP1008446A1 (zh) |
JP (1) | JP2002531303A (zh) |
CN (1) | CN1121944C (zh) |
AT (1) | ATE255007T1 (zh) |
AU (1) | AU1291500A (zh) |
DE (1) | DE69913196D1 (zh) |
HK (1) | HK1040961A1 (zh) |
WO (1) | WO2000034039A1 (zh) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101844643A (zh) * | 2010-05-25 | 2010-09-29 | 杨志 | 用于背胶袋的改性聚丙烯薄膜及其制备方法 |
CN104015988A (zh) * | 2014-05-30 | 2014-09-03 | 安徽先知缘食品有限公司 | 一种多功能包装袋 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1283242A1 (en) * | 2001-08-03 | 2003-02-12 | Amcor Flexibles Transpac N.V. | Blends of heterophasic polypropylene block copolymers for making films |
JP4932149B2 (ja) * | 2004-10-20 | 2012-05-16 | 大日本印刷株式会社 | 液体用紙容器 |
EP1759833A1 (en) * | 2005-08-30 | 2007-03-07 | Borealis Technology Oy | Film |
ES2352579T3 (es) | 2006-05-16 | 2011-02-21 | Basf Se | Películas sopladas mono y multicapa. |
US20120263924A1 (en) | 2011-04-12 | 2012-10-18 | Paul Thomas Weisman | Multi-Layer Films And Methods Of Forming Same |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8613162D0 (en) * | 1986-05-30 | 1986-07-02 | Exxon Chemical Patents Inc | Sealable films |
US5093188A (en) * | 1989-09-21 | 1992-03-03 | Paragon Films, Inc. | Single-sided cling stretch film |
AU7232591A (en) * | 1990-01-08 | 1991-08-05 | Paragon Films Incorporated | Single-sided cling stretch film |
US5085927A (en) * | 1990-04-10 | 1992-02-04 | Paragon Films, Inc. | Stretch film cling enhancement by addition of elastomers |
JPH07121571B2 (ja) * | 1990-10-24 | 1995-12-25 | 出光石油化学株式会社 | 多層フィルム |
US5756219A (en) * | 1996-01-16 | 1998-05-26 | Aep Industries, Inc. | Industrial stretch films |
JPH09207294A (ja) * | 1996-02-07 | 1997-08-12 | Tonen Chem Corp | 低温ヒートシール性ポリプロピレン多層フィルム |
JPH09314769A (ja) * | 1996-05-30 | 1997-12-09 | Sekisui Chem Co Ltd | シーラントフィルム |
JPH10272747A (ja) * | 1997-03-31 | 1998-10-13 | Kohjin Co Ltd | 積層ストレッチシュリンクフイルム |
-
1998
- 1998-12-07 EP EP98420226A patent/EP1008446A1/fr not_active Withdrawn
-
1999
- 1999-12-03 DE DE69913196T patent/DE69913196D1/de not_active Expired - Lifetime
- 1999-12-03 EP EP99956278A patent/EP1137538B1/fr not_active Expired - Lifetime
- 1999-12-03 AU AU12915/00A patent/AU1291500A/en not_active Abandoned
- 1999-12-03 AT AT99956278T patent/ATE255007T1/de not_active IP Right Cessation
- 1999-12-03 JP JP2000586514A patent/JP2002531303A/ja active Pending
- 1999-12-03 WO PCT/IB1999/001930 patent/WO2000034039A1/fr active IP Right Grant
- 1999-12-03 CN CN99814132A patent/CN1121944C/zh not_active Expired - Fee Related
-
2001
- 2001-06-06 US US09/875,482 patent/US20020127382A1/en not_active Abandoned
-
2002
- 2002-03-27 HK HK02102348.3A patent/HK1040961A1/zh unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101844643A (zh) * | 2010-05-25 | 2010-09-29 | 杨志 | 用于背胶袋的改性聚丙烯薄膜及其制备方法 |
CN104015988A (zh) * | 2014-05-30 | 2014-09-03 | 安徽先知缘食品有限公司 | 一种多功能包装袋 |
Also Published As
Publication number | Publication date |
---|---|
EP1137538B1 (fr) | 2003-11-26 |
DE69913196D1 (de) | 2004-01-08 |
ATE255007T1 (de) | 2003-12-15 |
HK1040961A1 (zh) | 2002-06-28 |
CN1121944C (zh) | 2003-09-24 |
EP1137538A1 (fr) | 2001-10-04 |
US20020127382A1 (en) | 2002-09-12 |
WO2000034039A1 (fr) | 2000-06-15 |
JP2002531303A (ja) | 2002-09-24 |
AU1291500A (en) | 2000-06-26 |
EP1008446A1 (fr) | 2000-06-14 |
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C19 | Lapse of patent right due to non-payment of the annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |