CN101160211B - 密封片材层压板 - Google Patents

密封片材层压板 Download PDF

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Publication number
CN101160211B
CN101160211B CN2006800119866A CN200680011986A CN101160211B CN 101160211 B CN101160211 B CN 101160211B CN 2006800119866 A CN2006800119866 A CN 2006800119866A CN 200680011986 A CN200680011986 A CN 200680011986A CN 101160211 B CN101160211 B CN 101160211B
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China
Prior art keywords
laminate
layer
tabstock
seal
basic
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CN2006800119866A
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CN101160211A (zh
Inventor
安德鲁芬威克·麦克莱恩
大卫约翰·欧布赖恩
维克托·萨切斯
克雷格沃伦·桑希尔
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Illinois Tool Works Inc
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Illinois Tool Works Inc
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/20—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of continuous webs only
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract

一种用于生产包括短片材(tapstock)的基本层压板(1b)的方法，所述方法包括以下步骤：将密封层压板(1)供给至层压位置，所述密封层压板(1)包括含有箔片层(4)的底部食品接触层和顶部聚酯层(5)，其中，聚酯层(5)的下侧的箔片层(4)已经被印刷；在到达层压位置之前，同时将比密封层压板(1)窄的短片材(6)供给至层压位置，使得短片材的底部和密封层压板的顶部聚酯层形成接触，以形成基本衬底(1a)，所述基本衬底的顶面部分地包括短片材(6)的顶面，并且部分地包括可热密封层压板的顶部聚酯层(5)；同时将具有顶部表面和底部表面的塑性膜片(8)供给至层压位置；以及将聚合物粘合剂连续地挤出在基本衬底(1a)的顶面和塑性膜片(8)的底部表面之间，这样当短片材被以相对于机器方向90°且相对于基本衬底180°的方向拉伸时，基本衬底(1a)和塑性膜片(8)以大于15N/cm的粘结强度粘附在一起，以形成包括短片材的基本层压板。随后可以将所形成的基本层压板层压至板材或合成辅助衬垫。

Description

密封片材层压板
技术领域
本发明涉及一种制造用在容器闭合系统中的层压板的方法。所生产的层压板为包括短片材的基本层压片材，其随后可以被粘结至辅助密封并用于通过螺旋帽来重新闭合容器。
背景技术
平常的是，在从医药产品至速溶咖啡的范围内的各种材料的包装中，提供闭合装置，其形式为连接至容器的颈部的密封和覆盖并保护所述密封的螺旋帽，所述螺旋帽在密封被去除以能够进入容器之后提供可再次闭合的帽。通常所述闭合装置为在密封的下侧具有热敏黏合层或通过金属箔覆盖的可熔塑性层。所述金属箔可以提供密封的衬底或者可以包括通过塑性材料或纸张形成的单独的衬底。密封随后被置于容器的颈部，并通过应用的螺旋帽而被夹在颈部。随后通过感应加热步骤加热金属箔，然后激活热敏黏胶层或融化塑性层，这样在冷却时，密封粘结至容器的颈部。最终用户时常遇到的困难是从容器中去除这种密封。因此，进行了以下尝试：即包括从容器的颈部向一旁延伸的突出部，这样，消费者可以紧握所述突出部以便于去除密封。
已经开发出单组件系统，在单组件系统中，所述基本密封和辅助衬里被生产为层压盘，所述层压盘被附着至帽内。商用Quadraseal(注册商标)系统为单组件系统的实例。密封部的底部层由通过蜡基粘合剂粘结至箔片层的玻璃纸形成。当将其中装配有所述系统的帽去除时，所述密封部仍粘结在容器的颈部。可以通过刺破密封并将其撕碎而将密封去除。由于玻璃纸纤维的破裂，因此将使少量纤维仍粘附在颈部的周围。
在又一实例DE9108868中，基本密封和辅助衬里通过蜡进行粘结。当加热基本密封部分中的金属箔时，蜡熔化并被吸收入辅助衬里中，从而基本密封和辅助衬里基本上彼此分离。当开启时，基本密封仍粘结至容器，而辅助衬里仍在帽中。这种系统包括突出部，所述突出部仅仅通过将基本密封的顶部层穿过密封的直径部分粘附至所述密封的的剩余部分而形成。这种系统的一个问题在于在衬里的表面上残留有蜡材料，这样当容器被重新密封时，容器的某些内容物可能会粘结至衬里的表面或者可能会释放到容器本身中。在食品和制药领域包装中，这样的蜡残留物是不希望有的。因此致力于尝试使用塑性基手段将基本密封粘结至辅助衬里作为所谓的释放层，以避免使用蜡。同样非常难以确保在将密封粘结至待密封的容器的过程中，所产生的热不使形成突出部的分层部粘结至基本密封部的剩余部分。
包括突出部结构的系统的又一实例为在US4961986中公开的“Top Tab(顶部突出部)”结构。这种结构包括多层基本密封，其中一层被部分地剥离，以提供在使用时完全位于容器颈部外周中的提起突出部。这种系统实际上为包括基本密封和辅助衬里，从而辅助衬里粘结至帽上的系统。随后将基本密封被推入帽中，并通过螺纹结合而保持在帽中的适当位置处。在这种系统中，通过应用条带状的粘胶层，并随后粘结至顶部层而将突出部粘结至基本密封，结果是其仅粘贴在存在粘合剂的特殊位置处。由于这种方法包括含有突出部的基本密封的渐进的一层层的结构，并且包括使用特殊形成的辊来应用条带的粘附，因此比较耗时。
又一突出部系统为成功的“Lift“n”Peel”(注册商标)商用系统。这种系统可以包括基本密封和辅助衬里，或者仅包括基本密封，并且通常也仅包括基本密封。基本密封包括厚的泡沫塑料层，这样，所述的密封无需借助辅助衬里所提供的稳定性，凭借自身即可成为一种产品。。泡沫塑料的厚度允许在容器或帽的尺寸上存在偏差。然而，泡沫塑料比较昂贵，并且最终的基本密封难以使用。与引入泡沫塑料相关的又一不利之处在于不是可印刷的衬底。现今，消费者严重依赖于商品的标签并且期望能够提供一种印刷有标识出厂商的密封。通常在包括在热感应层中的箔片层上进行印刷。这种情况只有在金属箔的顶部上的层为透明时才能够看到。由于泡沫塑料的不透明性，“Lift“n”Peel”系统不存在这种机会。Lift“n”Peel系统的顶部层是特殊的聚对苯二甲酸乙二醇酯/乙烯-醋酸乙烯脂(PET/EVA)结构。EVA的存在对于确保粘结至PET突起部和泡沫塑料是必需的。如果要对EVA进行印刷，则这将干扰EVA所显示出的粘结特性。因此相反，即“Lift“n”Peel”系统的顶部层的下侧的印刷是不可行的选择。所使用的PET/EVA结构为昂贵的材料，并且额外需要使用加热辊来熔化结构中的EVA组分以获得粘结。所使用的EVA的量越低，所需加热辊的尺寸越大。因此，为了使用含有最少EVA的低成本材料，辊的所需尺寸变得相当大且相当昂贵。
在WO 97/02997中，公开了一种将突出部引入基本密封层压板中的方法。在本申请中，向与压送辊接触的冷却辊传递三次进料。形成基本密封层压板的顶部层的第一次进料为涂布有聚丙烯的EVOH。第二次进料为隔音构件，以及第三次进料为挤压的短片材，例如聚丙烯。所有三次进料在冷却辊和压送辊接触的位置处形成接触。冷却辊对挤压出的短片材进行骤冷，以使其无定形性质最大化，并且促成所有这三个层的层压。
因此显然，需要简单的和低成本的方法来将短片材引入到基本密封层压板中。这种方法能够避免与现有技术相关的诸如必须逐步执行层压、产生无效的突出部或必须使用昂贵的设备和材料之类的问题。在当前的市场中生产含有被印刷或着色的突出部的基本层压板将是具有优势的。
所需要的装置必须具有分离的展开位置，该分离的展开位置用于被设置为能够同时展开的层压进料，。层压进料被进料至包括彼此接触的两个辊的层压位置。这样，进料彼此粘结而生成含有短片材的层压板，所述层压板随后缠绕在最终辊上，并且随后能够穿过相同的装置，粘结至辅助层压板。粘合剂向下竖直施用在进料辊彼此接触的位置上。进料辊的速度应当比施用粘合剂的速度快。粘合剂可以直接通过挤出机的模头施用。
发明内容
本发明提供了一种用于生产包括短片材的基本层压板的方法，所述方法包括以下步骤：
a)将密封层压板供给至层压位置，所述密封层压板包括含有箔片层的底部食品接触层和顶部聚酯层，所述箔片层位于所述底部食品接触层的顶部；
b)，同时将比密封层压板窄的短片材供给至层压位置，以在短片材到达层压位置之前，使短片材的底部和密封层压板的顶部聚酯层形成接触，以形成基本衬底，所述基本衬底的顶面部分地包括短片材的顶面，并且部分地包括密封层压板的顶部聚酯层；
c)将具有顶部表面和底部表面的塑性膜片供给至层压位置；以及
d)将聚合物粘合剂连续地挤出在基本衬底的顶面和塑性膜片的底部表面之间，以使当短片材被以相对于机器方向90°且相对于基本衬底180°的方向拉伸时，基本衬底和塑性膜片以大于15N/cm的粘附强度粘附在一起，以形成包括短片材的基本层压板。
在本发明的一个实施例中，密封层压板的底部食品接触层是可感应热密封的，并且包括铝箔层，在铝箔层的最终将与容器的颈部接触的最下部表面上涂有热熔融的粘合剂。可以将一层聚对苯二甲酸乙二醇酯插入热熔融粘合剂和铝箔片层之间，以将铝箔与所粘结的任何容器的内容物隔离开，以防止箔片层腐蚀。这种聚对苯二甲酸乙二醇酯层通常厚度为在从10μm至14μm的范围内。它通过利用溶剂胶层压或无溶剂胶层压粘结至箔片层。在被引入的情况下，聚对苯二甲酸乙二醇酯已由供应商粘结至箔片层。优选的是，箔片层的厚度在从12μm至30μm的范围内。
在本发明的又一实施例中，密封层压板的底部食品接触层是可传导热密封的。
在本发明的又一实施例中，密封层压板的底部食品接触层包括铝箔层，在铝箔层的最终将与容器的颈部接触的最下部表面上涂有玻璃纸。玻璃纸为由纸浆形成的纸基材料，所述的纸浆被锤打至其构成纤维均非常短从而得到几乎透明的脆性材料的程度。玻璃纸从例如法国的Ahlstrom购得。所述的玻璃纸通过一层粘合剂粘结至金属箔的最下部表面。尽管在这种系统中，常规地采用蜡基粘合剂将玻璃纸粘结至箔片，然而在本发明中优选的是使用聚乙烯基粘合剂或水基粘合剂，以确保形成足够强度的粘结。
基本层压板的底部玻璃纸层可以利用常规的粘合剂(例如PVA)粘结至容器的颈部。在本实施例中，箔片层的厚度可以低至9μm。在使用中，在将基本层压板从容器颈部去除的情况下，在玻璃层中将产生破裂，从而纸张纤维仍粘结于容器的颈部，而基本层压板仍然以单片的形式被去除。仍粘结在颈部的纸张纤维的有利之处在于提供了一种防揭开(tamper evident)系统。
箔片层可以随意地被印刷，以使粘结有基本层压板的任何容器的最终内容物的厂商的标识显而易见。消费者将此作为安全性、质量和内容物的原产地的保证。在箔片层被印刷的情况下，这个工作将会已经被箔片层的供应商完成了。
密封层压板的顶部层为聚酯层。包括这个层是为了增强基本密封层压板的强度，以使其不能被简单地用手容易地撕开或弄破。此外，包括这个层意味着印迹并不与挤出的聚合物粘合剂直接接触，并且由此消除潜在的有问题的相互作用。优选的是，顶部聚酯层的厚度为至少12μm。优选的是，顶部聚酯层的厚度在12μm至25μm的范围内。在本发明的优选的实施例中，聚酯为聚对苯二甲酸乙二醇酯。在密封层压板的顶部聚酯层为聚对苯二甲酸乙二醇酯的情况下，优选的是在与聚合物粘合剂接触之前，对顶部聚酯层进行电晕处理(coronatreatment)。
显然，优选的是，基本密封层压板的一个部件被印刷。这可以通过将具有预先印刷的上表面的箔片层引入到可热密封层来实现。可选的是，不与聚合物粘合剂接触的聚酯层的下面可以被印刷。在这两种情况下，要求聚酯层是透明的，以使在金属箔上或聚酯层下面的印刷对于最终用户是直接可见的。所述的印刷在引入短片材之前进行。
所形成的基本密封层压板包括如在US4961986中描述的“Top Tab”(注册商标)结构和“Lift“n”Peel”(注册商标)结构中包含的自由突出部。在所生产的基本密封层压板中，尽管突出部的相对尺寸不受限制，然而优选的示例为在基本层压板的直径小于36mm的情况下，突出部整个位于容器颈部的外周中，并且典型的是突出部约占密封区域的50％。通过将短片材粘结至可热密封层压板的顶部聚酯层来提供突出部。
被供给至如在步骤b)中详述的层压位置的短片材的宽度比可热密封层压板窄。优选的是，短片材可以由聚酯形成，更优选为聚对苯二甲酸乙二醇酯。在本发明的一个实施例中，最终与可热密封层压板的顶部聚酯层接触的短片材的底部表面可以被涂布以例如硅树脂的释放材料。这样做是为了进一步确保当成品基本密封层压板通过感应热密封而粘结至容器时，短片材不会粘结至顶部聚酯层。短片材可以进一步包括由聚酯形成且通过粘合剂贴层(tie layer)粘结至其他聚酯层的着色层或印刷层。
在步骤b)中，在本发明的一个实施例中，供给并非指供给单个短片材，而是可以供给包括等间隔设置的多个窄的短片材。这样，可以形成包括短片材的基本层压板的宽薄片，所述宽薄片可以随后根据需要进行切割，由此改善了系统的效率。
如在步骤c)中详细描述的，供给至层压位置的第三次进料为塑性膜片。优选的是，所述塑性膜选自包括聚对苯二甲酸乙二醇酯、聚酰胺、聚丙烯、或其复合材料。最优选的是，所述塑性膜为聚对苯二甲酸乙二醇酯。这种片材的宽度与可热密封层压板的宽度相同。这种塑性膜层必须是透明的，以使下部层上的印迹对最终用户是可见的。优选的是，塑性膜层的厚度为至少12μm。更优选的是，塑性膜层的厚度在12μm至36μm的范围内。在本发明的优选的实施例中，在塑性膜为PET片材的情况下，优选的是，塑性膜被共挤和电晕双重处理。这样做是为了确保在步骤d)中由聚合物粘合剂形成的粘结足够牢固。PET片材能够在共挤状态中获得。适当的材料的实例包括聚酯膜10.47(Lumirror 10.47)，它是在一侧上共挤的膜，并且可由Toray(东丽)公司购得。
在达到层压位置之前，短片材的底部表面和密封层压板的顶部PET层形成接触。在这个阶段，在两个进料之间没有粘结。这两个进料以彼此接触的方式供给至层压位置。为了实现这种目的，两个进料必须从同一侧接近层压位置。当彼此接触的密封层压板和短片材一起穿过层压位置时，它们的结合被称作基本衬底。由于短片材的宽度必需窄于密封层压板，供给到层压位置处的基本衬底的顶面，部分由短片材的顶面形成，部分由密封层压板的顶部聚酯层形成。
在层压位置中，基本衬底与从相对侧同时供给至层压位置的塑性膜片形成接触。在基本衬底顶面与塑性膜片底面接触的位置，聚合物粘合剂被连续地挤出在两个表面之间。其结果是，塑性膜片粘结在基本衬底的顶面的整个表面区域上。这意味着塑性片材将在部分宽度上粘结至密封层压板的顶部塑性膜层，并且塑性膜片将在剩余的宽度上粘结至短片材的顶面。其结果是，随后就形成了整个位于所形成的基本层压板的外周中的突出部。
当突出部被以相对于机器方向90°且相对于基本衬底180°的方向牵拉时，密封层压板的顶部塑性膜层和塑性膜片之间形成的粘结强度必须大于15N/cm。这是为了确保当利用突出部来去除容器的密封时，一旦向突出部施加拉力，突出部仍粘结至基本层压板。
优选的是，连续地挤出的聚合物粘合剂选自聚乙烯、聚乙烯-醋酸乙烯酯、顺丁烯二酸酐/丙烯酸脂/聚乙烯共聚物和乙烯-丙烯酸甲酯共聚物。最优选的是，聚合粘合剂的熔体流动指数在1dg/min至17dg/min的范围内。优选的是，粘合剂层的涂布量为至少30gm-2。
在优选的实施例中，粘合剂层的涂布量在20gm-2至40gm-2的范围内。在优选的实施例中，聚合粘合剂为乙烯-丙烯酸甲酯共聚物。
为了使任何印迹均可见，优选的是聚合粘合剂和塑性膜片均为透明的。
根据本发明制成的包括短片材的基本层压板随后可以粘结至辅助密封片材，以形成单组件的密封和衬里系统。这可以利用与用于形成包括短片材的基本衬里相同的装置完成。更具体的是，所述方法包括以下步骤：
将包括短片材的基本层压板供给至层压位置；
同时将辅助密封片材供给至层压位置，所述辅助密封片材的总挺度在从200gcm-1200gcm的范围内，并且具有用于与容器闭合装置接触的上表面，和用于密封容器的下表面；以及
通过模头将熔体流动指数在5dg/min至17dg/min的范围内的聚合物粘合剂挤出在包括短片材的基本层压板的顶部塑性膜片和辅助密封片材的下表面之间，以粘结两者从而形成密封片材层压板。
本发明的辅助密封片材的挺度在200gcm-1200gcm的范围内。依照泰莱达泰伯(Teledyne Taber)V-S挺度检测器(型号为150-B)进行挺度的测量。所采用的方法涉及将检测样品切割成3.8cm×7cm(1.5英寸×2.75英寸)的尺寸，其中一个检测样品顺着板材的纹理，而另一个检测样品与纹理成直角。检测在室温下进行。随后，将样品的顶部夹紧，使得样品居中且平行于检测器表面，并且样品的底部搁置在低于机器的辊的平板上。右手侧辊被设置为恰好与样品的底部接触，而不使样品偏斜。左手侧辊被设置为与样品略微接触，并且随后逆转1/4圈。注意确保刻度盘、驱动盘和摆锤均调整至零。通过推动操纵开关使样品沿一个方向偏斜，直到摆锤达到15°。记录固定刻度盘上的数值。随后摆锤的方向反转，并且样品沿相对的方向偏斜15°，并且记录固定刻度盘上的数值。采用两个值的平均值，并且采用适当的重量倍增因数以确定泰伯单位(gcm)的挺度。
在一些包括辅助密封片的实施例中，其可以由硬纸板或摺合纸板形成。可选的是，辅助密封片材可以为合成层压板。在辅助密封片材为合成层压板的情况下，优选的是其包括泡沫塑料，在泡沫塑料的每一个表面上均具有饰面层。泡沫塑料层的厚度优选地在0.85mm-1.65mm的范围内，并且适当的材料包括聚乙烯和聚丙烯泡沫塑料。饰面层的厚度优选在20μm至70μm的范围内。
饰面层可以包括单层，例如为聚对苯二甲酸乙二醇酯、聚乙烯、聚丙烯或聚酰胺膜，或者可选的是可以包括多层。饰面层的性质取决于泡沫塑料层和聚合物粘合剂的性质。在不能发现与泡沫塑料层和聚合物粘合剂同等相容的饰面层的情况下，饰面层则必需为多层，以获得会牢固粘结至粘合剂并随后粘结至泡沫塑料的缓变层。所述的缓变层将倾向于能够自身热密封。在饰面层为多层的情况下，优选的是，所述的饰面层包括在其各表面上均具有共聚物层的均聚物芯层。选择所述的均聚物芯层是为确保合成层压板具有适当的挺度。
在本发明的一个实施例中，其中辅助密封片粘结至基本层压板，泡沫塑料层为聚乙烯泡沫塑料，并且饰面层包括三个层，具体是在其每个表面均具有共聚物层的均聚物芯层，其中，所述的均聚物芯层包括聚丙烯，并且共聚物为聚乙烯/聚丙烯共聚物。引入聚丙烯均聚物层确保了合成层压板具有适当的挺度。这种辅助密封片可以通过商业获得或者如果需要可以通过层压来生产。
在本发明的实施例中，所述的泡沫塑料层为聚乙烯泡沫塑料，并且所述饰面层包括聚丙烯芯层，聚丙烯芯层的每个表面均具有聚丙烯/聚乙烯共聚物层，优选的是，聚合物粘合剂通过由模头共挤聚丙烯和聚乙烯而提供，这样聚丙烯与辅助密封片材的下表面接触，并且聚乙烯与基本层压板的顶部塑性膜表面接触。
为了将基本密封层压板粘结至辅助密封片材，将聚合物粘合剂挤出在基本密封层压板的顶部塑性膜表面和辅助密封片材的下表面之间。聚合物粘合剂的熔体流动指数必须在5dg/min至25dg/min的范围内。用于确定熔体流动指数的方法为国际标准ISO 113/ASTM D 1238。
在密封片材层压板中形成的不同粘结的强度是非常重要的。在使用中，形成在层压板的食品接触层和用于密封的容器的颈部之间的粘结应当足够强，以使当盖子被去除且保持完整的密封时，基本层压板保持粘附至容器的颈部。然而它们之间的粘结又应当比密封层压板的顶部层和短片材之间的接触位置处的粘结强度弱。
在辅助密封片粘结至基本层压板的情况下，需要熔体流动指数在所提供的范围内的聚合粘合剂，以确保在粘合剂和辅助密封片的下表面之间形成真正的熔接，而在粘合剂和基本层压板的顶部塑性膜层之间并非真正熔接。为了获得这种效果，与粘合剂接触的两个表面必须是不同的。粘合剂必须比粘结至基本密封层压板的顶部塑性膜层更牢固地粘结至辅助密封片材的下表面。基本层压板的顶部塑性膜层由此需要比辅助密封片材的下表面具有更高的表面能。术语“真正的熔接”指在粘合剂和辅助密封片的下表面之间形成粘结，以使得如果试图分离粘合剂和辅助密封的下表面，则粘合剂材料和下表面材料倾向优先于粘结而失效。优选的是，在聚合物粘合剂和基本密封片的顶部塑性层之间形成的粘结的剥离强度在1500mm/min下在25mm的宽条带上测量时，其在50g-130g的范围内。这意味着在使用中，当向粘结有密封片材层压板的容器的帽施加扭矩时，所述的基本层压板的顶部塑性膜片层和聚合物粘合剂之间的粘结将被破坏，这样，基本层压板仍粘结在容器，而辅助密封片材将保留在帽中。
在密封片材层压板粘结至装配有螺旋帽的容器的情况下，当旋拧螺旋帽时，最终用户将破坏粘结并听到“破裂声”。在听到这种声音的情况下，就证明容器尚未被揭开。适当的聚合物粘合剂包括低密度聚乙烯或共挤出的聚乙烯和聚丙烯。优选的时，聚合物粘合剂是聚乙烯。密封片层压板旨在用于颈部尺寸直到直径至少为100mm的闭合装置上。
聚合物粘合剂通过模头挤出。模头的长度优选在从500mm至2000mm的范围内。模头的缝隙优选为在从450μm至800μm的范围内，更优选的是，所述缝隙在从500μm至700μm的范围内。进料辊的速度在从50m/min至120m/min的范围内。进料辊的典型的速度为例如100m/min。
本发明的密封片材层压板通常以宽条带的形式形成。因此，为了形成突出部，需要将密封片材层压板的宽条带切割成较窄的条带。这些较窄的条带可以随后被切割形成以备应用于容器的容器闭合组件。将宽条带切割成较窄的条带需要精确地进行，以确保在正确的位置处进行切割以生成突出部。为准备以带子形式使用而提供的容器闭合组件可以随后从较窄的条带中冲压出，并在独立于制造密封片材层压板的方法和/或步骤中，被固定在螺旋帽的顶部的内侧。与常规的螺旋帽不同的是，适用于本发明的螺旋帽必须包括固位(retention)部件。优选的是，所述固位部件顶部为扇形且下部平坦，以使得插入容器闭合组件时的损坏最小化。固位部件可以包括多圈的螺纹或多头部分圈螺纹。容器可以由玻璃或塑性材料制成例如聚乙烯、聚酯、聚氯乙烯、聚丙烯或丙烯腈-丁二烯-苯乙烯聚合物。
根据本发明的装备有容器闭合组件的螺旋帽可以被旋拧在容器的敞开的颈部上，由此将容器闭合组件夹在容器的敞开的颈部和帽的顶部之间。基本层压板随后通过感应加热粘结至容器的敞开的颈部。
附图说明
现将参考以下附图描述本发明的实施例，其中：
图1为穿过如根据本发明的方法形成的包括短片材的基本层压板的实施例的截面图，其中垂直尺寸被放大。
图2为在本发明的方法中使用的层压装置的示意图。
图3为穿过密封片层压板的实例的截面图，其中垂直尺寸被放大。
图4为穿过螺旋帽的横截面，其中示出了设置在适当位置的容器闭合组件。
图5为示出了设置在容器的颈部上的密封的立体图。
图6为穿过如根据本发明的方法形成的包括短片材的基本层压板的另一个实施例的截面图，其中垂直尺寸被放大。
具体实施方式
实例1
密封层压板1可通过西班牙的Gerosa公司商业获得。所述的密封层压板包括：用于粘结至待密封的容器的可热密封层2、3；以及箔片层(foil layer)4。密封层压板的顶部层5为PET，其背面被印刷。作为如在本实例中的购买这部分结构2、3、4的另一种选择，可以在独立的步骤中，将可热密封层层压至箔片层，以形成可热密封层压板。这种密封层压板滚至层压装置中的第一进料辊9上。
层压装置中的第二进料辊10是短片材6的来源。所使用的短片材由PET形成，其厚度在从12μm至25μm的范围内。短片材6的宽度在从20mm至60mm的范围内。
第三进料辊11被加载有PET片材8，其可以通过欧洲的Toray公司商业获得。PET片材8的厚度在从12μm至36μm的范围内。所使用的PET片材8为共挤PET热密封层，以确保最佳的粘结。
密封层压板1、短片材6和PET片材8同时供给至层压位置12，在这里，挤出机13垂直设置在进料之间的接触位置的上方。在到达层压位置12之前，密封层压板1和短片材6形成接触，以形成基本衬底1a。
随后通过挤出机13将乙烯-丙烯酸甲酯共聚物7如幕帘式地连续地挤出在基本层压板1a的顶面和PET片材8的底面之间。挤出条件为在加持点的温度达到100℃至200℃。辊14和辊21相对于向PET的底部表面施用粘合剂的速度以70m/min的速度移动。片材8和最终的包括短片材的基本层压板经由冷却辊14卷起传递至最终产品辊15上。这种工艺在图2中示意性地示出。
利用厚度为36μm的PET片材8和厚度为12μm的短片材形成基本层压板的剥离强度，其中挤出的乙烯-丙烯酸甲酯共聚物7的涂布量为40gm-3。
涂布量被确定如下：0.5米至1米长的、背面有宽度为1米的聚酯的纸张替代基本层压板被传送至层压位置。随后，将一道EVA帘连续地挤出在背面有聚酯的纸张的顶部聚酯面和PET片材8的底部表面之间。随后将10cm×10cm的样品穿过纸幅的宽度切割，并且记录样品的重量克数。将背面有聚酯的纸张和PET片材8的重量从记录的数字中减去，并将计算结果乘以100，以给出以gm-2为单位的涂布量。
如先前详细描述的，基本衬底的顶面和塑性膜片的底面必须粘结在一起，并且粘结强度大于15N/cm。在独立的试验中，粘结强度通过利用下文中详述的方法确定。所采用的装置为连接至台式电脑的拉力试验机、两个钳夹、80mm×12.5mm的测量样板和锋利的刀子。垂直于机器方向的、尺寸为12.5mm长10mm宽的样品被穿过基本层压板的截面而切割。采用措施来确保PET片材8的一部分和包括短片材的基本层压板分离。钳夹的高度被调节为使得突出部被插入到一个钳夹中，而基部被插入到另一个钳夹中。样品被设置为指向机器。随后，突出部和基部被拉开，并且拉开所需要的力通过装置被记录。
实例2
如在实例1中形成的包括短片材6的基本层压板随后粘结至辅助密封片材以形成单组件的密封和衬里系统。辅助密封片材17在Unipac公司处制造，并且包括厚度为1.25mm的泡沫塑料层，所述泡沫塑料层为其每一侧均覆盖有聚丙烯膜19的的层的聚乙烯泡沫塑料18。挺度为320gcm。
采用与在实例1中详述的形成包括短片材1b的基本层压板的装置相同的装置。包括短片材的基本层压板被加载至进料辊11上，并且辅助密封片材17被加载在第三进料辊9上。在这种情况下，第二进料辊10是多余的从而不被使用。包括短片材的基本层压板和辅助密封片材17被同时供给至层压位置12。熔体流动指数为7.5dg/min的一道低密度聚乙烯帘16和熔体流动指数(MFI)为11dg/min的聚丙烯16a由挤出机连续地挤出在包括短片材的基本层压板的顶部聚酯表面8和辅助密封片材19a的下表面之间，以粘附两个表面，从而形成密封片材层压板20，其中，聚丙烯16a粘附至辅助密封片材19a的下表面，且聚乙烯16粘结至顶部聚酯表面8。
随后密封片材层压板被切割成窄条带。从这些条带冲压出圆盘以形成密封片材层压板的圆盘。密封片材层压板20通过固位部件23固定至螺旋帽22的顶部内侧。装备有本发明的密封片材层压板的螺旋帽随后被旋拧在容器的敞开的颈部上。帽22和瓶24随后进行感应加热步骤，在感应加热步骤中，通过在箔片中产生涡流，围绕箔片的外围加热箔片，从而熔化可热密封层2，以将包括短片材的基本层压板结合至容器的敞开的颈部。
实例3
包括用于粘结至待密封的容器的底部食品接触层25、26的密封层压板29和被印刷的箔片层27通过西班牙的Gerosa公司购买。密封层压板的最下部层25包括涂布量为至少30gm-2的玻璃纸。层26为涂布量(干重)为至少3gm-2的水基粘合剂层。铝箔层27的厚度为8μm。密封层压板28的顶部层为PET。这是作为结构25、26、27的一部分而购买的，或者是在独立的步骤中，被层压至箔片层，以形成密封层压板。
基本层压板是利用这种密封层压板29而形成，以替代具有实例1的可热感应密封层的密封层压板1，以生成基本层压板。最终的基本层压板在图6中示出。

Claims (44)

1.一种用于生产包括短片材的基本层压板的方法，包括以下步骤：
a)将密封层压板供给至层压位置，所述密封层压板包括含有箔片层的底部食品接触层和顶部聚酯层，所述箔片层位于所述底部食品接触层的顶部；
b)同时将比密封层压板窄的短片材供给至层压位置，以在短片材到达层压位置之前，使短片材的底部和密封层压板的顶部聚酯层形成接触，以形成基本衬底，所述基本衬底的顶面部分地包括短片材的顶面，并且部分地包括密封层压板的顶部聚酯层；
c)同时将具有顶部表面和底部表面的塑性膜片供给至层压位置；以及
d)将聚合物粘合剂连续地挤出在基本衬底的顶面和塑性膜片的底部表面之间，以使当短片材被以相对于机器方向90°且相对于基本衬底180°的方向拉伸时，基本衬底和塑性膜片以大于15N/cm的粘结强度粘附在一起，以形成包括短片材的基本层压板。
2.根据权利要求1所述的方法，其中，形成所述密封层压板的一部分的所述聚酯层的下侧或箔片层已被印刷。
3.根据权利要求1所述的方法，其中，所述塑性膜片由选自聚对苯二甲酸乙二醇酯、聚酰胺、聚乙烯或前述材料的复合材料所组成的组中的材料形成。
4.根据权利要求3所述的方法，其中，所述塑性膜片为聚对苯二甲酸乙二醇酯。
5.根据上述权利要求中任一项所述的方法，其中，所述密封层压板的顶部聚酯层为聚对苯二甲酸乙二醇酯。
6.根据权利要求1所述的方法，其中，所述聚合物粘合剂的熔体流动指数在从5dg/min至25dg/min的范围内。
7.根据权利要求1所述的方法，其中，所述短片材由聚对苯二甲酸乙二醇酯形成。
8.根据权利要求1所述的方法，其中，所述短片材包括着色的或印刷的PET层。
9.根据权利要求1所述的方法，其中，在步骤(b)中，所述短片材包括等间隔设置的多个窄的短片材。
10.根据权利要求1所述的方法，其中，所述密封层压板的预部聚酯层的厚度在12μm至25μm的范围内。
11.根据权利要求1所述的方法，其中，所述塑性膜片的厚度在12μm至36μm的范围内。
12.根据权利要求1所述的方法，其中，所述短片材的厚度在12μm至25μm的范围内。
13.根据权利要求1所述的方法，其中，所述聚合物粘合剂为乙烯-丙烯酸甲酯共聚物。
14.根据权利要求1所述的方法，其中，通过模头连续挤出所述聚合物粘合剂，并且模头的长度在从500mm至2000mm的范围内。
15.根据权利要求14所述的方法，其中，所述模头的缝隙在从500μm至700μm的范围内。
16.根据权利要求1所述的方法，其中，所述箔片层的厚度在从12μm至30μm的范围内。
17.根据权利要求16所述的方法，其中，所述箔为铝箔。
18.根据权利要求1所述的方法，其中，所述密封层压板的底部食品接触层为感应热密封层。
19.根据权利要求1所述的方法，其中，所述密封层压板的底部食品接触层包括第一底部食品接触层和第二底部食品接触层，所述第一底部食品接触层由玻璃纸形成，并且所述第二底部食品接触层为粘合剂层。
20.根据权利要求19所述的方法，其中，所述粘合剂层包括水基粘合剂或聚乙烯基粘合剂。
21.根据权利要求1所述的方法，其中，所述密封层压板的底部食品接触层为传导热密封层。
22.根据权利要求9所述的方法，包括将包括短片材在内的基本层压板切割成条带的后续步骤。
23.根据权利要求22所述的方法，其中，所述条带随后成型，以形成容器闭合组件。
24.一种制造密封片材层压板的方法，所述方法在权利要求1所述的制造基本层压板的方法的基础上，进一步包括以下步骤：
a)将包括短片材的基本层压板供给至层压位置；
b)同时将辅助密封片材供给至层压位置，所述辅助密封片材的总挺度在从200gcm-1200gcm的范围内，并且具有用于与容器闭合装置接触的上表面和用于密封容器的下表面；
c)通过模头将第二聚合物粘合剂挤出在包括短片材的基本层压板的顶部塑性膜片和辅助密封片材的下表面之间，以形成密封片材层压板。
25.根据权利要求24所述的方法，其中，所述第二聚合物粘合剂的熔体流动指数在从5dg/min至25dg/min的范围内。
26.根据权利要求24所述的方法，其中，所述第二聚合物粘合剂为聚乙烯。
27.根据权利要求24所述的方法，其中，在步骤c)中，第二聚合物粘合剂包括共挤出的两种聚合物粘合剂。
28.根据权利要求27所述的方法，其中，所述两种聚合粘合剂为聚乙烯和聚丙烯。
29.根据权利要求24所述的方法，其中，所述辅助密封片材为纸浆板或牛皮纸板。
30.根据权利要求29所述的方法，其中，所述纸浆板或牛皮纸板的厚度在从500μm至1000μm的范围内。
31.根据权利要求24所述的方法，其中，所述辅助密封片材为合成层压板。
32.根据权利要求31所述的方法，其中，所述合成层压板包括泡沫塑料，所述泡沫塑料在其每一个表面均具有饰面层。
33.根据权利要求32所述的方法，其中，所述泡沫塑料为聚乙烯或聚丙烯泡沫塑料。
34.根据权利要求32或33所述的方法，其中，所述泡沫塑料层的厚度在从0.85mm至1.65mm的范围内。
35.根据权利要求32或33所述的方法，其中，所述饰面层的厚度在从20μm至70μm的范围内。
36.根据权利要求32所述的方法，其中，所述饰面层包括均聚物芯层，所述均聚物芯层在其每一个表面均具有共聚物层。
37.根据权利要求36所述的方法，其中，所述均聚物为聚丙烯，并且所述共聚物为聚丙烯/聚乙烯共聚物。
38.根据权利要求36所述的方法，其中，所述第二聚合物粘合剂包括共挤出的聚丙烯和聚乙烯，使得所述聚丙烯与辅助密封片材的下表面接触，并且所述聚乙烯与基本层压板的顶部塑性膜片接触。
39.根据权利要求24所述的方法，包括将密封片材层压板切割成条带的后续步骤。
40.根据权利要求39所述的方法，其中，所述条带随后成型，以形成容器闭合组件。
41.一种基本层压板，包括：
密封层压板，其包括含有箔片层的底部食品接触层和顶部聚对苯二甲酸乙二醇酯层，所述箔片层位于所述底部食品接触层的顶部；
短片材，其具有顶面和底面，其中，所述底面与顶部聚对苯二甲酸乙二醇酯层接触以形成基本衬底，所述基本衬底的顶面部分地包括短片材的顶面，并且部分地包括密封层压板的顶部聚对苯二甲酸乙二醇酯层；以及
塑性膜层，其通过挤出的聚合物粘合剂粘结至基本衬底的顶面，以使当短片材被以相对于机器方向90°且相对于基本衬底180°的方向拉伸时，基本衬底和塑性膜层以大于15N/cm的粘结强度粘附在一起。
42.一种密封片材层压板，包括：
根据权利要求41所述的、粘结至总挺度在200gcm-1200gcm的范围内的辅助密封片材的基本层压板，其中，基本层压板的顶部塑性膜层通过挤出的聚合粘合剂粘结至辅助密封片材。
43.一种螺旋帽，其中保持有根据权利要求40所述的方法形成的成型容器闭合组件。
44.一种装配有根据权利要求43的帽的容器，其中，所述密封层压板被密封至容器的开口，以封闭流体或固体物质。
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MX2007012737A (es) 2008-01-14
AU2006234311B2 (en) 2010-03-25
KR101295219B1 (ko) 2013-08-12
JP2008535703A (ja) 2008-09-04
BRPI0610582A2 (pt) 2010-07-06
KR20070121739A (ko) 2007-12-27
CA2603631C (en) 2012-06-05
ES2318743T3 (es) 2009-05-01
US20140001185A1 (en) 2014-01-02
US9533805B2 (en) 2017-01-03
US20170173930A1 (en) 2017-06-22
EP1789260B1 (en) 2008-11-26
CN101160211A (zh) 2008-04-09
DE602006003838D1 (de) 2009-01-08
ATE415273T1 (de) 2008-12-15
EP1789260A1 (en) 2007-05-30
AU2006234311A1 (en) 2006-10-19
CA2603631A1 (en) 2006-10-19
NZ563099A (en) 2011-03-31
WO2006108853A1 (en) 2006-10-19

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