CN112585010A - 具有良好的阻隔作用的利于回收的、可简单撕开的包装层压件及其制造方法 - Google Patents
具有良好的阻隔作用的利于回收的、可简单撕开的包装层压件及其制造方法 Download PDFInfo
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- CN112585010A CN112585010A CN201880096812.7A CN201880096812A CN112585010A CN 112585010 A CN112585010 A CN 112585010A CN 201880096812 A CN201880096812 A CN 201880096812A CN 112585010 A CN112585010 A CN 112585010A
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- layer
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Abstract
本发明涉及一种具有良好的阻隔作用的利于回收的、可简单撕开的包装层压件,所述包装层压件包括第一层压层(2)和第二层压层(3),第一层压层(2)是共挤出的且双向拉伸的复合体,所述复合体包括具有至少60体积百分比的HDPE份额的基质层(4)、连接层(5)和由阻隔聚合物、优选聚酰胺或乙烯醇共聚物构成的阻隔层(6),所述阻隔层具有第一层压层的总厚度的最大20%的厚度,连接层(5)设置在基质层(4)和阻隔层(6)之间,并且第一层压层(2)在其阻隔层(6)上与第二层压层(3)连接。
Description
技术领域
本发明涉及一种包装层压件,包括第一层压层和第二层压层,其中,第一层压层具有阻隔层,以及本发明涉及一种用于制造这样的包装层压件的方法。
背景技术
在包装工业中使用包装层压件,所述包装层压件按照应用应该具有不同的特性。这样的包装层压件通常是多层的塑料膜,所述塑料膜在挤出方法、共挤出方法中(在两种情况中不仅在平膜方法而且在吹膜方法中)或层压方法中(各个层借助层压胶粘剂的连接)、也在这些方法的混合中制造。在包装层压件中也可以集成不是由塑料制成的层、例如铝层或纸层。包装层压件通常也具有外部的密封层,以便将包装层压件通过热封处理成希望的包装件、例如袋、口袋、小纸袋等。在另一种使用中,包装层压件也可以作为收缩膜实施,所述收缩膜按照应用也可以以可密封的、但未印花的实施方式例如用于包装较大的肉类部分而制造。
对包装层压件的典型的要求是对氧气、水蒸汽和香气的阻隔功能。为此目的,包装层压件通常包含由铝或适合的阻隔聚合物、例如乙烯-乙烯醇共聚物(EVOH)或聚酰胺(PA)构成的阻隔层。此外可以还包含其它的层,以便赋予包装层压件期望的特性、如韧性、刚度、可收缩性、抗拉强度等。密封层典型地由聚烯烃、通常聚丙烯(PP)或以不同的密度的聚乙烯(PE)LLDPE、LDPE、MDPE或HDPE实施。
为了可以简单地处理包装层压件,包装层压件当然也不应当弯曲或卷起(所谓的Curling),因此通常使用对称的层构造。
此外已知,通过单向或双向的取向改变包装层压件的特性。这样的取向可以通过挤出过程、例如在多气泡挤出方法中(multiple bubble process)实现,或在挤出过程之后才通过包装层压件沿机器方向(沿包装层压件的纵向方向)和/或沿横向方向(垂直于纵向方向)的延展实现。通过包装层压件的取向,可以特别是改善刚度、抗拉强度和韧性。此外可以通过取向改变包装层压件的结晶,使得本身混浊的材料、例如HDPE也在拉伸之后实现较高的透明度。
WO 2013/032932 A1描述了一种作为收缩膜的这样的包装层压件,例如包括HDPE/连接层/EVOH/连接层/密封层的构造。为了建立收缩特性,包装层压件作为整体双轴向地拉伸。但由此拉伸只可以在包装层压件的各个层已达到足够的结合附着之后实施。WO 2009/017588A1示出类似物。但WO 2013/032932 A1和WO 2009/017588 A1特别地针对用于连接层的合适的材料。
也由EP 673 759 B1得知一种用于收缩膜的包装层压件,包括EVOH的阻隔层和至少一个另外的聚合物层,所述聚合物层关于拉伸特性应与阻隔层相容。作为用于所述另外的聚合物层的示例列举出酸酐改性的低密度线性聚乙烯(LLDPE)。
WO 2015/175871 A1又描述一种包装层压件,包括HDPE层,其与例如由PA、含乙烯的或含丙烯酸酯的聚合物构成的阻隔层连接。在所述阻隔层上此外也可以设置例如由LLDPE构成的密封层。目的是制造利于回收的层压件,其方式为:阻隔层占据包装层压件的总重量的最大5%。WO 2015/175871 A1的包装层压件不进行取向。
在由包装层压件构成的许多包装件中也希望,包装件可简单用手撕开,尤其是用于包装件的简单的打开。在这里例如由WO 2005/113370 A1已知,单向拉伸的膜平行于拉伸方向相比于横向于拉伸方向可以更简单地被撕开,并且这样的膜平行于拉伸方向相对于未拉伸的或双向拉伸的膜也可以减少的撕开力撕开。这样的膜也可以是层压件的部分,所述层压件也可以具有由铝或EVOH构成的阻隔层。单向拉伸的膜给予层压件平行于拉伸方向的良好的撕开特性并且基本上阻止横向于拉伸方向的撕开。
EP 1 769 908 A1再次描述,当塑料层由具有0.910g/cm3和0.960g/cm3之间的密度的PE(亦即LDPE、MDPE或HDPE)和多环的烯烃、例如环烯烃共聚物(COC)的混合物制成并且层压件经受小的双向的伸展时,由阻隔层(例如EVOH)和两侧的塑料层构成的层压件可以沿两个方向简单地撕开。这样的小的双向的伸展例如在吹膜方法中挤出时调节,以此可以不发生在挤出之后的层压件的取向的单独步骤。但这样的层压件基于COC的份额只有限地可回收并且也比纯种材料更昂贵地制造。在直至提到的在混合中的60%COC的高的COC份额时,层压件一般地说不再可回收,至少只要在PE份额中也包含较大的量LDPE。
JPH6-262737 A1描述了一种包括HDPE层和例如由EVOH构成的阻隔层的包装层压件,其具有线性的撕开特性。在其中说明了,单向或双向拉伸的包装层压件导致层压件的倾斜的撕开并且由此导致借此制造的包装件的未加控制的打开特性。为了消除该问题,代替拉伸建议层压件的单向的卷绕,这应引起线性的撕开特性。在此沿纵向方向和横向方向的取向应该不少于5并且沿纵向方向和横向方向的取向的比例应该处于5和15之间的范围中。这样的比例在拉伸层压件时未达到。典型地,所述取向的比例在双向拉伸的情况中处于1以下。
发明内容
本发明的任务在于,给出一种利于回收的包装层压件,其可以简单地制造并且可沿两个方向简单被撕开。此外任务在于,给出一种用于这样的包装层压件的制造方法。
所述任务通过共挤出第一层压层解决,所述第一层压层包括具有至少60体积百分比的HDPE份额的基质层、连接层和由阻隔聚合物、优选聚酰胺或乙烯-乙烯醇共聚物构成的阻隔层,所述阻隔层的厚度最大为第一层压层的总厚度的20%,所述连接层设置在基质层和阻隔层之间,后续双向地拉伸共挤出的第一层压层,并且后续地连接这样双向拉伸的第一层压层与具有至少80体积百分比的聚乙烯份额的第二层压层,将第二层压层与第一层压层的阻隔层连接。按照本发明的包装层压件具有第一层压层和第二层压层,第一层压层是共挤出的且双向拉伸的复合体,所述复合体包括具有至少60体积百分比的HDPE份额的基质层、连接层和由阻隔聚合物、优选聚酰胺或乙烯-乙烯醇共聚物构成的阻隔层,所述阻隔层具有第一层压层的总厚度的最大20%的厚度,连接层设置在基质层和阻隔层之间,并且第一层压层在阻隔层上与第二层压层连接。
通过在与第二层压层层压之前双向地拉伸第一层压层,显著提高第一层压层的阻隔作用。附加地令人吃惊地发现,通过双向的拉伸,具有确定的构造的第一层压层可以沿两个方向同样简单地被撕开。该撕开特性施加到包装层压件上,从而包装层压件本身也可以简单地沿两个方向被撕开。附加地通过第一层压层相对于通常的对称的构造的简单的不对称的构造显著简化制造,这也显著降低制造费用。
高的HDPE份额的拉伸的层易于沿纵向方向的撕开,尤其是当HDPE份额高达80%和处于其以上时。因此在PE包装层压件中,具有高的HDPE份额的这样的MDO层至今总是与较柔韧的LLDPE或mLLDPE组合,例如通过另外的由LLDPE构成的层,在此争取达到在包装层压件中的高的LLDPE份额。现在此外令人吃惊地发现,具有这样高的HDPE份额(也接近100%HDPE)的第一层压层在没有这样的韧性高的LLDPE层的情况下也足够韧性并且不倾向于撕开。为此的原因在于连接层,所述连接层赋予层压层需要的韧性。第一层压层因此也可以有利地用作阻隔膜。
基于拉伸的HDPE基质层的良好的透明度,当第一层压层在与第二层压层连接之前在阻隔层上印花、金属镀层或涂敷涂层时,可以改善包装层压件的光学的特性。通过金属镀层或涂敷涂层,还可以附加地提高阻隔作用。
对于一定的应用有利的是,第一层压层在基质层上与一层或多层的另外的层压层连接。在此第一层压层可以在阻隔层和/或基质层上印花、金属镀层或涂敷涂层。同样所述另外的层压层的至少一个层可以是印花、金属镀层或涂敷涂层的。
对于一定的应用有利的是,第一层压层在其基质层上与单向或双向拉伸的第四层压层连接,所述第四层压层包括具有至少60体积百分比的HDPE份额的基质层、由阻隔聚合物构成的阻隔层和在其间设置的连接层。这样的包装层压件具有特别良好的阻隔特性。
另一种有利的设计如下得出,即,第二层压层是共挤出的、沿机器方向或双向拉伸的层压件,所述层压件包括具有至少60体积百分比、优选至少70体积百分比和完全特别优选至少80体积百分比的HDPE份额的基质层、连接层、由阻隔聚合物、优选聚酰胺或乙烯-乙烯醇共聚物构成的阻隔层和密封层,所述阻隔层的厚度为第二层压层的总厚度的最大20%,第二层压层的连接层设置在第二层压层的基质层和阻隔层之间,并且密封层设置在基质层上,并且第二层压层的阻隔层与第一层压层的阻隔层连接。这样的包装层压件也具有特别良好的阻隔特性。附加地,由此密封层有利地集成到共挤出的第二层压层中,由此不需要用于包装层压件的其它制造步骤。
附图说明
接着参考图1至5进一步解释本发明,其示例性、示意性并且不限制地示出本发明的有利的设计。在附图中:
图1示出按照本发明的包装层压件的第一设计;
图2示出按照本发明的包装层压件的有利的第二设计;
图3示出按照本发明的包装层压件的有利的第三设计;
图4示出按照本发明的包装层压件的有利的第四设计;以及
图5示出第一层压层作为对称的阻隔膜的设计。
具体实施方式
图1示出包括第一层压层2和与此连接的第二层压层3的按照本发明的包装层压件1。
在包装层压件1中的第一层压层2沿机器方向(MDO)和沿横向方向(TDO)、亦即双向地延伸并且具有包括基质层4和阻隔层6的不对称的层结构,所述基质层和阻隔层通过连接层5相互连接。第一层压层2的厚度优选为10至40μm。
基质层4具有至少60体积百分比、优选至少70体积百分比和完全特别优选至少80体积百分比的高密度聚乙烯(PE)(HDPE)的份额。HDPE份额可以在此接近100体积百分比,其中,基于通常的添加剂(如滑动添加剂、抗粘连添加剂、填料等),100体积百分比一般从未达到。HDPE理解为具有在0.94–0.97g/cm3之间的密度的PE。其余的是相容的聚烯烃材料、优选线性低密度聚乙烯(LLDPE)(具有0.87–0.94g/cm3之间的密度)、低密度聚乙烯(LDPE)(具有0.915–0.935g/cm3之间的密度)亦或低密度线性茂金属聚乙烯(mLLDPE),尤其是以便提高韧性。作为相容的聚烯烃材料原则上考虑任何类型的聚乙烯,尤其是也考虑乙烯共聚物、例如乙烯-乙酸乙烯酯共聚物(EVA)、甲基丙烯酸乙酯(EMA)、乙烯/丙烯酸共聚物(EAA)或乙烯-丙烯酸丁酯共聚物(EBA)。同样作为相容的聚烯烃材料也可以以最大20体积百分比的程度使用聚丙烯(PP)或环烯烃共聚物(COC)。在PP的情况下,优选使用包括乙烯作为共聚单体(通常5至15%)的聚丙烯无规共聚物、包括乙烯的聚丙烯共聚物或与线性PE类型、如mLLDPE、LLDPE或HDPE足够相容的聚丙烯均聚物,以便取得至少限定的可回收性。
HDPE和相容的聚烯烃材料在此可以在基质层4中作为混合物存在。但基质层4也可以多层(挤出或共挤)地构造,包括(一个亦或多个)HDPE层和(一个亦或多个)聚烯烃材料的层。基质层4的厚度优选为5至35μm。
阻隔层6由阻隔聚合物、亦即尤其是针对氧、氢和/或香气具有足够的阻隔特性的聚合物构成。所述阻隔聚合物优选是聚酰胺(PA)或乙烯-乙烯醇共聚物(EVOH)。优选EVOH作为阻隔聚合物。阻隔层6具有第一层压层2的总厚度的最大20%、优选5至10%、亦即最大2至8μm的厚度。通过阻隔层6的小的厚度,由此不影响回收有利性。
连接层5用于连接阻隔层6和基质层4。在这里应该实现足够的结合附着性,尤其是以便可靠地阻止第一层压层2的不希望的分层。合适的连接层5优选由具有提高的极性的聚合物构成,例如基于以马来酸酐改性的聚烯烃(如PE或PP)、乙烯-乙酸乙烯酯共聚物(EVA)、乙烯/丙烯酸共聚物(EAA)、乙烯-丙烯酸丁酯共聚物(EBA)或类似的聚烯烃共聚物。连接层5的厚度为第一层压层2的总厚度的最大10%、典型地1至5μm。
第二层压层3主要由PE构成,其中,在第二层压层3的整个聚合物量上的PE份额在没有可能的添加的矿物的或其它的填料的情况下应该是至少80体积百分比。在这里可以使用不同的PE类型,亦即将LDPE、LLDPE、MDPE、HDPE单纯地亦或作为混合物或以共聚物的形式亦或多层地使用。第二层压层3的厚度按照包装层压件1的应用典型地为20至200μm之间。
同样在第二层压层3中,为了力求达到的回收有利性,剩余的其余物当然由相容的聚烯烃材料构成,如以上说明的那样。
通过在包装层压件1中主要使用PE和相容材料可以制造特别利于回收的层压件,其能按在机械回收中的常规方法简单并且低成本地再利用。
第一层压层2通过共挤出制造,因为这能够实现特别简单的、低成本的制造。优选使用已知的吹膜或平膜挤出方法。
第一层压层2在共挤出之后双向、亦即沿机器方向(通常纵向方向或挤出方向)和沿横向方向(相对于机器方向以90°旋转)地拉伸。沿机器方向和横向方向的拉伸度在此无须相同。沿机器方向的拉伸度在此优选为至少4:1至8:1。沿横向方向的拉伸度在此优选为至少5:1至10:1。拉伸可以在此在线地(亦即直接在共挤出之后)或离线地(亦即在共挤出之后在后来的时刻)进行。在此可以首先沿机器方向拉伸并且随后沿横向方向拉伸,或同样可设想沿两个方向同时拉伸。拉伸典型地以大约10℃至30℃、典型地大约20℃在第一层压层2中最低的熔化温度(在HDPE中大约128℃至130℃)之下发生。
在这里要说明,在吹膜挤出和平膜挤出中,挤出间隙(在吹膜中1.5至2.5mm)或挤出喷嘴的间隙显著大于挤出的膜的最终厚度(典型地在10至200μm之间)。为此挤出的熔体在显著高于挤出的聚合物的熔点的温度中延伸,由此其获得最终的厚度。在吹膜挤出中,熔体例如典型地沿横向方向以大约因数2至3(所谓的吹胀比)并且沿纵向方向以因数1:10至1:100(所谓的缩小比)延伸。但在挤出中的该延伸不可以与塑料膜的拉伸比较,因为拉伸通常在稍微低于聚合物的熔点的温度中进行,以便通过沿拉伸方向的拉伸持久地对不规则的聚合物和半晶质的区域进行取向。
主要由聚乙烯构成的第一层压层2的以双向的拉伸的不对称构造是非典型的并且至今尤其是在吹膜中在实际中被避免,因为从如下事实出发,即,这样的构造尤其是通过极性的阻隔层6的吸水而卷起(Curling),这使再处理变得困难或成为不可能。但已经示出,在构造的具体设计中所述卷起以不妨碍再处理的可接受的程度发生。为此有利的是,将第一层压层2在制造之后非常迅速地与第二层压层3连接,以便由此特别是减少阻隔层6的吸水。也许也可以需要或合适的是,将共挤出的膜卷连同第一层压层2一起通过合适的包装件保护以防吸水,直至对其层压。
但第一层压层2的非典型的不对称的构造的优点特别是在于,只需要唯一的昂贵的并且不太刚性的连接层5。借此可以降低用于第一层压层2的成本并且可以实现较刚性的第一层压层2。较高的刚度特别是在使用包装层压件1来制造袋时是有利的。
按照本发明的第一层压层2的其它的优点由拉伸产生。由此得到特别是基质层4的高的透明度。通过阻隔层的拉伸相比于未拉伸的同类的阻隔聚合物实现大约三到四倍高的阻隔值,由此可以在相同的阻隔作用时使用较不昂贵的阻隔聚合物。由此第一层压层2的成本可以显著降低。除此之外,对于相同的阻隔作用需要较少的阻隔聚合物,这附加地改善可回收性。
优选第一层压层2利用多阶段的吹膜挤出方法(例如三重或双重发泡方法)制造,因为由此与生产相关地产生较少的边缘部段,这特别是在较昂贵的阻隔聚合物的情况下实现包装层压件1的较低的成本。在吹膜挤出中,也可以使用具有小于3的MFI(质量流量指数,Mass Flow Index)的韧性好的HDPE材料。这样的HDPE材料具有较高的分子量和较好的机械特性,这对于在包装层压件1中的使用是有利的。当然这样的材料特别容易地沿纵向方向撕开并且甚至出现沿纵向方向的不希望的撕开。该不希望的特性可以通过将具有小于3的MFI的HDPE材料结合到所述的第一层压层2中来消除并且甚至实现沿两个方向的均匀的撕开。
令人吃惊地发现,所述的包括基质层4、阻隔层6和连接层5的双向拉伸的第一层压层2尽管60体积百分比的高的HDPE份额、尤其是即使在高达80体积百分比至100体积百分比的非常高的HDPE份额时也不易于在沿机器方向的第一拉伸步骤之后沿纵向方向撕开。该效果在此不仅在第一层压层2的不对称的构造中而且在第一层压层2的对称的构造中出现。
令人吃惊地发现的是,这样的双向拉伸的第一层压层2沿两个方向、亦即沿机器方向和横向方向可基本上相同良好地撕开并且具有控制的撕开特性。
但对于用作本发明的阻隔膜1的第一层压层2,也考虑对称的构造(如在图5中示出的),例如以100体积百分比HDPE的基质层4/连接层5/EVOH阻隔层6/连接层5/100体积百分比HDPE的基质层4的形式。在一个(或两个)所述基质层4中,也可能混合低的mLLDPE或LLDPE份额(例如5至10体积百分比),优选在最外面的层之一中,以便修改处理特性。在这样的对称的构造中,两个外部的基质层4也可以比内部的层更厚地实施,亦即以例如x/1/1/1/x的构造形式,其中x>1,尤其是x=1.5、2、3或4。
这样的第一层压层2单独作为阻隔膜11同样被视为有独创性的并且其特征尤其是在于至少一个基质层4,该基质层具有至少60体积百分比、优选至少80体积百分比的HDPE份额,并且该基质层通过如上所述的连接层5与如上所述的阻隔层6连接。基质层4在此也可以多层地构造。附加地,阻隔层6为了对称的构造可以借助另一个如上所述的连接层5与另一个如上所述的基质层4连接。这样的阻隔膜11通过共挤出和随后的双向拉伸制造。拉伸度在此为优选沿机器方向至少4:1至8:1并且沿横向方向至少5:1至10:1。拉伸在此可以在线地(亦即直接在共挤出之后)或离线地(亦即在共挤出之后在后来的时刻)进行,以及相继首先纵向然后横向地进行或同时进行。
为了制造包装层压件1,拉伸的第一层压层2和第二层压层3优选通过挤出层压、挤出涂敷或胶粘层压相互连接,其中,第二层压层3与第一层压层2的阻隔层6连接。在挤出涂敷中,第二层压层3被挤出到第一层压层2的阻隔层6上,其中,在其之间优选也应该设置增附剂。在层压时,第二层压层3借助适合的层压胶粘剂(例如在挤出层压时基于聚氨酯胶粘剂亦或聚烯烃共聚物)与阻隔层6连接。层压胶粘剂的厚度在通常的聚氨酯基的胶粘剂的情况下优选为2至5g/m2或在挤出层压的情况下为5至20g/m2。
在适合的第二层压层3中已证实,全部的包装层压件1也承担第一层压层2的撕开特性,即包装层压件1也可沿两个方向同样简单地由手撕开。第一层压层2借此给予包装层压件1撕开特性。
第二层压层3在此优选构成密封层7,所述密封层在由包装层压件1构成的包装件中通常朝向被包装的产品。所述包装件在此通过对包装层压件1进行裁切、折叠和热封制成。可能的包装件是袋、纸袋、口袋等。
第二层压层3也可以多层地实施,例如挤出或共挤出,如在图2中表示并且在后面详细说明的。但第二层压层3也可以配备有阻隔功能并且也可以拉伸,如在图4中表示并且在后面详细说明的。
在包装层压件1的另一种设计中,如在图2中示出的,第一层压层2在阻隔层6一侧上与第二层压层3连接并且在基质层4一侧上与另一个层压层10、在这里第三层压层8连接。第三层压层8优选是一层或多层的聚合物膜,例如主要由PE构成的膜(至少80体积百分比PE),如参考第二层压层3说明的。第三层压层8可以再次挤出涂敷或胶粘层压到第一层压层2上,如参考图1中的密封层7解释的。按照图2的这样的包装层压件1例如可以用于制造管。在该情况中,第二层压层3和第三层压层8的厚度典型地处于150μm的范围中。
在图2中此外示出,第二层压层3也可以多层地构造,在这里例如包括构成密封层7的两个层7a、7b。这同样适用于第三层压层8。第二层压层3的这样的构造当然也可以设置在按照图1的实施方式中。
此外可能的是,在第一层压层2与第二层压层3连接之前,将拉伸的第一层压层2在拉伸之后在阻隔层6上进行金属镀层和/或印花和/或涂敷涂层(例如利用氧化铝或二氧化硅)。优选以铝进行金属镀层。HDPE基质层4特别是在拉伸之后足够透明,从而印刷图、金属镀层或涂层通过基质层4可见。阻隔层6可以出于印花的目的也经受要印花的表面的预处理、例如电晕或火焰处理,以便改善印刷层在阻隔层6上的附着。但备选地或附加地,基质层4也可以不仅在朝向阻隔层6的一侧上而且在另一个侧上、必要时再次在表面处理之后印花、金属镀层或涂敷涂层。在这里可以使用通用的印刷方法、例如凹印方法或苯胺印刷方法。
第三层压层8也可能附加或备选于第一层压层2在一侧或两侧进行印花、金属镀层或涂敷涂层。
在图2的实施例的一种有利的设计中,对第一层压层2的阻隔层6优选以铝进行金属镀层,以便提高阻隔作用。附加地,第三层压层8可能在外侧上印花。
利用图3对按照本发明的包装层压件1的另一个实施例进行说明,该包装层压件优选可以用于制造管。在这里第一层压层2在阻隔层6上如在图1的实例中与第二层压层3连接。第一层压层2在其基质层4上与另一层压层10、在这里第四层压层2’连接,所述另一层压层具有与第一层压层2相同的构造并且单向(沿机器方向)或双向拉伸。第四层压层2’由此再次具有基质层4’,所述基质层利用连接层5’与阻隔层6’连接。在这里,第四层压层2’的阻隔层6’与第一层压层2的基质层4连接,优选利用如上说明的适合的复合胶粘剂连接。第四层压层2’的这些层如以上已经说明地那样进行构造和组合。第四层压层2’主要由具有至少80体积百分比PE份额的PE材料构成。第一层压层2和第四层压层2’的各层的厚度和精确的组份或材料当然在此无须一致。
同样,在该实施方式中第四层压层2’可以在基质层4’和/或阻隔层6’上附加或备选于第一层压层2印花、金属镀层或涂敷涂层。在一种特别有利的设计中,第四层压层2’是印花的,优选在其阻隔层6’上,并且第一层压层2加金属镀层,优选在其阻隔层6或基质层4上。由此可以提高包装层压件1的阻隔作用。但也可以将由氧化铝或二氧化硅构成的涂层设置在第一层压层2的阻隔层6或基质层4上,以用于再次提高阻隔作用。
利用图4说明本发明的另一种有利的设计。在这里,第二层压层3再次多层地实施并且具有基质层4”、阻隔层6”和连接层5”,类似于在第一层压层2中那样。对于这些层并且也对于在该设计中第二层压层3的制造,上面关于图1至3对第一层压层2或第四层压层2’说明的内容类似适用。附加地,第二层压层3在该设计中具有密封层7。密封层7优选由PE材料、例如mLLDPE、LLDPE或由其它的适合的热塑性塑料、如聚丙烯(PP)制成。当然对于包括密封层7的该第二层压层3始终适用的是,其由至少80体积百分比的PE构成。第二层压层3的密封层7与第二层压层3的其它层共挤出。图4的第二层压层3被拉伸,如第一层压层2并且如以上说明的。密封层7在该实施方式中借此在多层的拉伸的阻隔膜中集成,所述阻隔膜类似于第一层压层2地构造。由此,该第二层压层3具有与第一层压层2基本上相同的撕开特性。
在该设计中,双向拉伸的第一层压层2和沿机器方向或双向拉伸的第二层压层3在对接的阻隔层6、6”上相互连接,优选借助胶粘剂层9通过胶粘层压相互连接。合适的层压胶粘剂例如是基于聚氨酯或聚烯烃共聚物的胶粘剂。层压层9的厚度优选为2至5g/m2。
同样,在该实施方式中,包装层压件1的(一个亦或多个)层可以进行印花、金属镀层或涂敷涂层。
在所述实施方式中,当然也可能还在第一层压层2上附加地设置另一层压层10(例如上面说明的第三层压层8或第四层压层2’),如在图4中示出的。
按照本发明的包装层压件1因此具有至少一个不对称的、双向拉伸的具有至少60体积百分比HDPE的第一层压层2,所述第一层压层包括基质层4、阻隔层6和连接层5,并且具有构成密封层7的第二层压层3,所述第二层压层具有至少80体积百分比的PE份额。在该包装层压件1上可以如以上说明在第一层压层2的背离第二层压层3的一侧上设置具有至少80体积百分比的PE份额的另外的一层或多层的层压层10(例如第三层压层8或第四层压层2’)。该另外的一层或多层的层压层10借此与第一层压层2的基质层4连接。
在由按照本发明的包装层压件1构成的包装件中,包装层压件1的密封层7以有利的方式朝向包装内侧。
通过对按照本发明的包装层压件1的第一层压层2、第二层压层3或另外的层压层10的至少一个层以阻隔漆、例如聚乙烯醇(PVOH)进行印花,也可以以这种方式进一步提高包装层压件1的阻隔作用。这样的漆层可以非常薄地涂敷,典型地在0.5至2.0g/m2的范围中,并且借此不影响包装层压件1的回收有利性。
最后要说明,在第一层压层2、第二层压层3或另外的层压层10中的上述层的每个单独的层也可以本身又多层地构造。
Claims (13)
1.用于制造包装层压件(1)的方法,该方法包括如下步骤:
-共挤出第一层压层(2),该第一层压层包括具有至少60体积百分比、优选至少70体积百分比和完全特别优选至少80体积百分比的HDPE份额的基质层(4)、连接层(5)和由阻隔聚合物构成、优选由聚酰胺或乙烯-乙烯醇共聚物构成的阻隔层(6),所述阻隔层的厚度最大为第一层压层(2)的总厚度的20%,所述连接层(5)设置在基质层(4)和阻隔层(6)之间,
-双向地拉伸共挤出的第一层压层(2),
-将这样双向拉伸的第一层压层(2)与具有至少80体积百分比的聚乙烯份额的第二层压层(3)连接,在此将第二层压层(3)与第一层压层(2)的阻隔层(6)连接。
2.按照权利要求1所述的方法,其特征在于,所述第一层压层(2)在与第二层压层(3)连接之前在阻隔层(6)上进行印花、金属镀层或涂敷涂层。
3.按照权利要求1或2所述的方法,其特征在于,所述第一层压层(2)在基质层(4)上与具有至少80体积百分比的聚乙烯份额的一层或多层的另外的层压层(10)连接。
4.按照权利要求3所述的方法,其特征在于,所述第一层压层在与所述另外的层压层(10)连接之前在阻隔层(6)上和/或在基质层(4)上进行印花、金属镀层或涂敷涂层。
5.按照权利要求3所述的方法,其特征在于,对所述另外的层压层(10)的至少一个层进行印花、金属镀层或涂敷涂层。
6.按照权利要求3所述的方法,其特征在于,所述第一层压层(2)在其基质层(4)上与以单向或双向拉伸的第四层压层(2’)形式的多层的另外的层压层(10)连接,所述第四层压层包括具有至少60体积百分比的HDPE份额的基质层(4’)、由阻隔聚合物构成的阻隔层(6’)和在其间设置的连接层(5’),第四层压层(2’)的阻隔层(6’)与第一层压层(2)的基质层(4)连接。
7.按照权利要求1或2所述的方法,其特征在于,所述第一层压层(2)与第二层压层(3)连接,所述第二层压层包括具有至少60体积百分比、优选至少70体积百分比和完全特别优选至少80体积百分比的HDPE份额的基质层(4”)、连接层(5”)、由阻隔聚合物、优选由聚酰胺或乙烯-乙烯醇共聚物构成的阻隔层(6”)和密封层(7),所述阻隔层的厚度最大为第二层压层(3)的总厚度的20%,这些层是共挤出的,第二层压层(3)的连接层(5”)设置在第二层压层(3)的基质层(4”)和阻隔层(6”)之间并且密封层(7)设置在基质层(4”)上,并且共挤出的第二层压层(3)沿机器方向或双向地拉伸,并且第二层压层(3)的阻隔层(6”)与第一层压层(2)的阻隔层(6)连接。
8.包装层压件,该包装层压件包括第一层压层(2)和第二层压层(3),第一层压层(2)是共挤出且双向拉伸的复合体,所述复合体包括具有至少60体积百分比的HDPE份额的基质层(4)、连接层(5)和由阻隔聚合物、优选由聚酰胺或乙烯-乙烯醇共聚物构成的阻隔层(6),所述阻隔层的厚度最大为第一层压层的总厚度的20%,连接层(5)设置在基质层(4)和阻隔层(6)之间,并且第一层压层(2)在其阻隔层(6)上与第二层压层(3)连接。
9.按照权利要求8所述的包装层压件,其特征在于,所述第一层压层(2)的阻隔层(6)是印花、金属镀层或涂敷涂层的。
10.按照权利要求8或9所述的包装层压件,其特征在于,所述第一层压层(2)在其基质层(4)上与具有至少80体积百分比的聚乙烯份额的一层或多层的另外的层压层(10)连接。
11.按照权利要求10所述的包装层压件,其特征在于,所述另外的层压层(10)的至少一个层是印花、金属镀层或涂敷涂层的。
12.按照权利要求10或11所述的包装层压件,其特征在于,所述另外的层压层(10)是以共挤出且沿机器方向或双向拉伸的复合体形式的第四层压层(2’),所述第四层压层包括至少60体积百分比的HDPE份额的基质层(4’)、由阻隔聚合物、优选由聚酰胺或乙烯-乙烯醇共聚物构成的阻隔层(6’)和在其间设置的连接层(5’),并且第一层压层(2)的基质层(4)与第四层压层(2’)的阻隔层(6’)连接。
13.按照权利要求8或9所述的包装层压件,其特征在于,所述第二层压层(3)是共挤出的、沿机器方向或双向拉伸的层压件,所述层压件包括具有至少60体积百分比、优选至少70体积百分比和完全特别优选至少80体积百分比的HDPE份额的基质层(4”)、连接层(5”)、由阻隔聚合物、优选由聚酰胺或乙烯-乙烯醇共聚物构成的阻隔层(6”)和密封层(7),所述阻隔层的厚度最大为第二层压层(3)的总厚度的20%,第二层压层(3)的连接层(5”)设置在第二层压层(3)的基质层(4”)和阻隔层(6”)之间,并且密封层(7)设置在基质层(4”)上,并且第二层压层(3)的阻隔层(6”)与第一层压层(2)的阻隔层(6)连接。
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CA3109533A1 (en) | 2020-02-27 |
BR112021001621A2 (pt) | 2021-04-20 |
PL3840951T3 (pl) | 2023-06-19 |
ES2945038T3 (es) | 2023-06-28 |
MX2021002038A (es) | 2021-04-28 |
CN112585010B (zh) | 2022-10-21 |
WO2020038579A1 (de) | 2020-02-27 |
RU2759719C1 (ru) | 2021-11-17 |
JP2022500274A (ja) | 2022-01-04 |
JP7181382B2 (ja) | 2022-11-30 |
EP3840951A1 (de) | 2021-06-30 |
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